10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

____________________________________________

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the Quarterly Period Ended September 30, 2020

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission File No. 001-36609

NORTHERN TRUST CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	36-2723087
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

50 South LaSalle Street		60603
Chicago,	Illinois	(Zip Code)
(Address of principal executive offices)

Registrant’s telephone number, including area code: (312) 630-6000

____________________________________________

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol	Name of each exchange on which registered
Common Stock, $1.66 2/3 Par Value	NTRS	The NASDAQ Stock Market LLC
Depositary Shares, each representing 1/1,000th interest in a share of Series E Non-Cumulative Perpetual Preferred Stock	NTRSO	The NASDAQ Stock Market LLC

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ☐   No  x

At September 30, 2020, 208,121,233 shares of common stock, $1.66 2/3 par value, were outstanding.

NORTHERN TRUST CORPORATION

QUARTERLY REPORT ON FORM 10-Q

FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2020

TABLE OF CONTENTS

	Page
Consolidated Financial Highlights (unaudited)	1
Part I – Financial Information
Items 2 and 3: Management’s Discussion and Analysis of Financial Condition and Results of Operations and Quantitative and Qualitative Disclosures About Market Risk	3
Item 1: Consolidated Financial Statements (unaudited)	38
Consolidated Balance Sheets	38
Consolidated Statements of Income	39
Consolidated Statements of Comprehensive Income	39
Consolidated Statements of Changes in Stockholders’ Equity	40
Consolidated Statements of Cash Flows	42
Notes to Consolidated Financial Statements	43
Item 4: Controls and Procedures	89
Part II – Other Information
Item 1: Legal Proceedings	90
Item 1A: Risk Factors	90
Item 2: Unregistered Sales of Equity Securities and Use of Proceeds	90
Item 6: Exhibits	91
Signatures	92

i

CONSOLIDATED FINANCIAL HIGHLIGHTS

(UNAUDITED)

	THREE MONTHS ENDED SEPTEMBER 30,						NINE MONTHS ENDED SEPTEMBER 30,
CONDENSED INCOME STATEMENTS ($ In Millions)	2020		2019		% CHANGE(1)		2020		2019		% CHANGE(1)
Noninterest Income	$	1,156.5	$	1,120.2	3	%	$	3,470.1	$	3,268.3	6	%
Net Interest Income	328.6		417.7		(21)		1,108.8		1,257.1		(12)
Total Revenue	1,485.1		1,537.9		(3)		4,578.9		4,525.4		1
Provision for Credit Losses	0.5		(7.0)		N/M		127.5		(13.5)		N/M
Noninterest Expense	1,094.7		1,036.3		6		3,197.2		3,071.2		4
Income before Income Taxes	389.9		508.6		(23)		1,254.2		1,467.7		(15)
Provision for Income Taxes	95.4		124.0		(23)		285.8		346.6		(18)
Net Income	$	294.5	$	384.6	(23)	%	$	968.4	$	1,121.1	(14)	%

PER COMMON SHARE
Net Income — Basic	$	1.32	$	1.70	(22)	%	$	4.35	$	4.95	(12)	%
— Diluted	1.32		1.69		(22)		4.34		4.92		(12)
Cash Dividends Declared Per Common Share	0.70		0.70		—		2.10		1.90		11
Book Value — End of Period (EOP)	51.38		46.86		10		51.38		46.86		10
Market Price — EOP	77.97		93.32		(16)		77.97		93.32		(16)

SELECTED BALANCE SHEET DATA ($ In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019		% CHANGE(1)
End of Period:
Total Assets	$	152,082.0	$	136,828.4	11	%
Earning Assets	138,952.7		125,236.6		11
Deposits	122,589.1		109,120.6		12
Stockholders’ Equity	11,579.1		11,091.0		4

	THREE MONTHS ENDED SEPTEMBER 30,						NINE MONTHS ENDED SEPTEMBER 30,
	2020		2019		% CHANGE(1)		2020		2019		% CHANGE(1)
Average Balances:
Total Assets	$	140,925.4	$	116,352.1	21	%	$	134,645.2	$	117,364.7	15	%
Earning Assets	129,368.0		104,959.1		23		121,748.2		107,092.6		14
Deposits	112,844.7		89,020.4		27		106,290.9		89,903.4		18
Stockholders’ Equity	11,402.9		10,687.8		7		11,078.3		10,552.6		5

CLIENT ASSETS ($ In Billions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019		% CHANGE(1)
Assets Under Custody/Administration(2)	$	13,077.6	$	12,050.4	9	%
Assets Under Custody	10,122.6		9,233.5		10
Assets Under Management	1,311.7		1,231.3		7

N/M - Not meaningful

⁽¹⁾    Percentage calculations are based on actual balances rather than the rounded amounts presented in the Consolidated Financial Highlights.

⁽²⁾    For the purposes of disclosing Assets Under Custody/Administration, to the extent that both custody and administration services are provided, the value of the assets is included only once.

1

SELECTED RATIOS AND METRICS

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
	2020		2019		2020		2019
Financial Ratios:
Return on Average Common Equity	10.5	%	14.9	%	12.0	%	14.9	%
Return on Average Assets	0.83		1.31		0.96		1.28
Dividend Payout Ratio	53.0		41.4		48.4		38.6
Net Interest Margin(1)	1.03		1.61		1.24		1.60

	SEPTEMBER 30, 2020				DECEMBER 31, 2019
	STANDARDIZED APPROACH		ADVANCED APPROACH		STANDARDIZED APPROACH		ADVANCED APPROACH		WELL-CAPITALIZED RATIOS		MINIMUM CAPITAL RATIOS
Capital Ratios:
Northern Trust Corporation
Common Equity Tier 1 Capital	13.4	%	13.9	%	12.7	%	13.2	%	N/A		4.5	%
Tier 1 Capital	14.5		15.1		14.5		15.0		6.0		6.0
Total Capital	16.5		16.7		16.3		16.8		10.0		8.0
Tier 1 Leverage	7.7		7.7		8.7		8.7		N/A		4.0
Supplementary Leverage	N/A		8.8		N/A		7.6		N/A		3.0
The Northern Trust Company
Common Equity Tier 1 Capital	13.8	%	14.6	%	12.3	%	13.0	%	6.5	%	4.5	%
Tier 1 Capital	13.8		14.6		12.3		13.0		8.0		6.0
Total Capital	15.6		16.0		14.0		14.6		10.0		8.0
Tier 1 Leverage	7.2		7.2		7.3		7.3		5.0		4.0
Supplementary Leverage	N/A		8.1		N/A		6.4		3.0		3.0

⁽¹⁾    Net interest margin is presented on a fully taxable equivalent (FTE) basis, a non-generally accepted accounting principle (GAAP) financial measure that facilitates the analysis of asset yields. The net interest margin on a GAAP basis and a reconciliation of net interest income on a GAAP basis to net interest income on an FTE basis are presented on page 35.

2

PART I – FINANCIAL INFORMATION

Items 2. and 3. Management’s Discussion and Analysis of Financial Condition and Results of Operations and Quantitative and Qualitative Disclosures about Market Risk

The following is management’s discussion and analysis of the financial condition and results of operations (MD&A) of Northern Trust Corporation (Corporation) for the third quarter of 2020. The following should be read in conjunction with the consolidated financial statements and related footnotes included in this report as well as the Annual Report on Form 10-K for the year ended December 31, 2019. Investors also should read the section entitled “Forward-Looking Statements.”

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS

General

The Corporation is a leading provider of wealth management, asset servicing, asset management and banking solutions to corporations, institutions, families and individuals. The Corporation focuses on managing and servicing client assets through its two client-focused reporting segments: Corporate & Institutional Services (C&IS) and Wealth Management. Asset management and related services are provided to C&IS and Wealth Management clients primarily by the Asset Management business. Except where the context requires otherwise, the terms “Northern Trust,” “we,” “us,” “our,” “its,” or similar terms mean the Corporation and its subsidiaries on a consolidated basis.

COVID-19 Pandemic and Recent Events

The COVID-19 global pandemic continued to present health and economic challenges on an unprecedented scale during the third quarter of 2020. During this time, Northern Trust continued to focus on the health and well-being of its workforce, meeting its clients’ needs and supporting its communities. Although planning is underway to return to the office when conditions permit, the vast majority of staff is expected to continue to work remotely for some time to come.

Workforce

As governments have begun implementing plans to reopen their respective jurisdictions, Northern Trust has begun its return-to-office (RTO) phase under the oversight of its COVID Executive Committee composed of senior leadership across various functions. Plans for RTO have been developed on a location-by-location basis based on business unit needs. Northern Trust continues to consider site readiness, transportation options, technology capabilities, and workforce alignment, and plans for the return of a small portion of each office’s population in the initial RTO phase to allow for optimal social distancing. To ensure the health and well-being of Northern Trust’s workforce, clients and visitors, several social distancing elements and other protective measures, such as temperature screenings, where allowable by law, distribution of personal protective equipment, and workforce self-certification, have been implemented. Several offices continued to return portions of their workforce in the third quarter of 2020.

Client Service

Northern Trust has offered assistance to its clients affected by the COVID-19 pandemic by lending under a government lending program and providing payment deferrals. The Corporation continues to assess developments in government actions meant to support the economy, as further discussed below.

U.S. Small Business Administration’s Paycheck Protection Program

During the second quarter of 2020, Northern Trust became a lender under the Paycheck Protection Program (PPP), which is administered by the U.S. Small Business Administration (SBA), an agency of the U.S. Department of the Treasury, which works with financial institutions in providing loans to small businesses. The PPP, which is meant to aid small businesses during the COVID-19 pandemic, was created under the Coronavirus Aid, Relief, and Economic Security (CARES) Act, which was signed into law on March 27, 2020. In the second quarter of 2020, the Paycheck Protection Program Flexibility Act was enacted to provide updates to the PPP.

As of September 30, 2020, Northern Trust had funded loans totaling $215.3 million under the PPP. The Corporation accounts for PPP loans as loan receivables and amounts are disclosed in Note 6 — Loans and Leases to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

The original timeframe for PPP lending expired on June 30, 2020, but Congress acted on June 30, 2020 to provide a 5-week extension for PPP lending to allow small businesses additional time to apply for the remaining PPP funds allocated by Congress in connection with the CARES Act. Northern Trust continued to lend under the PPP through the new August 8, 2020 deadline.

3

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

COVID-19 Pandemic and Recent Events (continued)

Troubled Debt Restructuring (TDR) Relief

Due to the economic environment arising from the COVID-19 pandemic, there have been two forms of relief provided to lenders exempting certain loan modifications which would otherwise be classified as TDRs from such classification. The first of these forms of relief is provided by certain interagency guidance from various banking regulators, including the Board of Governors of the Federal Reserve System (Federal Reserve), the Federal Deposit Insurance Corporation, the National Credit Union Administration, the Office of the Comptroller of the Currency, and the Consumer Financial Protection Bureau (Interagency Guidance). The other is provided under section 4013 of the CARES Act. Northern Trust has elected to apply each of these forms of relief, when applicable, in providing borrowers with qualifying loan modifications, including payment deferrals, in response to the COVID-19 pandemic. For further information on TDRs, please refer to Note 6 — Loans and Leases to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

Community Support

Small Business Support

From April 15, 2020 through September 30, 2020, Northern Trust provided $103.0 million in low-cost funding to assist Community Development Financial Institutions (CDFIs), which are instrumental in providing loans to small businesses and non-profit organizations under the PPP. The funding helps meet urgent demand among small businesses and non-profit groups by providing flexible terms and low rates. CDFIs provide loans, investments, financial services and technical assistance to underserved populations and communities. This funding to CDFIs, which is reported in Debt Securities Held to Maturity on the consolidated balance sheets, is separate and distinct from the $215.3 million in PPP funds that the Corporation has lent to its own small business clients.

New Corporate Philanthropic Strategy

Northern Trust announced on June 15, 2020 that it pledged $20.0 million over the next 5 years as a part of its new corporate philanthropic strategy. The goal of the new strategy, which launched on September 11, 2020, is to reduce the economic opportunity gap. Northern Trust is committed to creating more equitable opportunities to achieve long-term financial success for those who face unfair hurdles because of their race, ethnicity, gender, geography or socio-economic conditions.

Additional COVID-19 economic and market-related impacts to the Corporation’s financial condition and results of operations are discussed throughout this Form 10-Q.

Overview of Financial Results

Net income per diluted common share decreased in the current quarter to $1.32 from $1.69 in the third quarter of 2019. Net income decreased $90.1 million, or 23%, to $294.5 million in the current quarter from $384.6 million in the prior-year quarter. Annualized return on average common equity was 10.5% in the current quarter and 14.9% in the prior-year quarter. The annualized return on average assets was 0.83% in the current quarter as compared to 1.31% in the prior-year quarter.

Revenue decreased $52.8 million, or 3%, to $1.49 billion in the current quarter from $1.54 billion in the prior-year quarter.

Trust, Investment and Other Servicing Fees increased $28.3 million, or 3%, from $975.5 million in the prior-year quarter to $1.00 billion in the current quarter, primarily due to new business, favorable currency translation and favorable markets, partially offset by higher money market mutual fund waivers.

Other noninterest income increased $8.0 million, or 6%, from $144.7 million in the prior-year quarter to $152.7 million in the current quarter, primarily reflecting higher other operating income and foreign exchange trading income, partially offset by lower security commissions and trading income.

Net interest income decreased $89.1 million, or 21%, to $328.6 million in the current quarter as compared to $417.7 million in the prior-year quarter, primarily due to a lower net interest margin, partially offset by an increase in average earning assets.

There was a $0.5 million provision for credit losses in the current quarter, as compared to a credit provision of $7.0 million in the prior-year quarter. The current quarter provision was primarily due to an increase in the reserve evaluated on a collective basis, which relates to pooled financial assets sharing similar risk characteristics. The increase in the collective basis reserve was driven by projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with increases in the private client, commercial real estate, and residential real estate portfolios, partially offset by a decrease in the commercial and institutional portfolio. The overall increase in the reserve on a collective basis was partially offset by a decrease in the reserve associated with loans evaluated on an individual basis.

The Corporation adopted Accounting Standards Update (ASU) No. 2016-13, “Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments” (ASU 2016-13) on January 1, 2020, which significantly changed the way impairment of financial instruments is recognized by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of financial instruments. For more information on the adoption of ASU 2016-13, please refer to Note 2 — Recent Accounting Pronouncements to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

4

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Overview of Financial Results (continued)

Noninterest expense increased $58.4 million, or 6%, from $1.04 billion in the prior-year quarter to $1.09 billion in the current quarter, primarily attributable to higher other operating expense, equipment and software expense, employee benefits expense, and compensation expense, partially offset by lower outside services. The increase in other operating expense was primarily due to a $43.4 million charge related to a corporate action processing error.

The provision for income taxes in the current quarter totaled $95.4 million, representing an effective tax rate of 24.5%. The provision for income taxes in the prior-year quarter totaled $124.0 million, representing an effective tax rate of 24.4%.

Trust, Investment and Other Servicing Fees

Trust, investment and other servicing fees are based primarily on the market value of assets held in custody, managed or serviced; the volume of transactions; securities lending volume and spreads; and fees for other services rendered. Certain market value calculations on which fees are based are performed on a monthly or quarterly basis in arrears. Low interest rate environments have historically had a negative impact on fees earned on certain products. Beginning in the second quarter of 2020, the Corporation elected to waive a portion of certain fees associated with money market mutual funds. These fee waivers, which are expected to increase in a continued low interest rate environment in which the yields in certain funds remain insufficient to pay the stated fees associated with such funds, will adversely impact trust, investment and other servicing fees within the C&IS and Wealth Management reporting segments.

The components of Trust, Investment and Other Servicing Fees are provided below.

TABLE 1: TRUST, INVESTMENT AND OTHER SERVICING FEES

	THREE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020		2019		CHANGE
C&IS Trust, Investment and Other Servicing Fees
Custody and Fund Administration	$	395.0	$	392.2	$	2.8	1	%
Investment Management	136.8		114.7		22.1		19
Securities Lending	19.7		20.1		(0.4)		(2)
Other	33.4		32.9		0.5		2
Total C&IS Trust, Investment and Other Servicing Fees	$	584.9	$	559.9	$	25.0	4	%
Wealth Management Trust, Investment and Other Servicing Fees
Central	$	151.1	$	157.3	$	(6.2)	(4)	%
East	110.9		106.8		4.1		4
West	84.7		83.6		1.1		1
Global Family Office	72.2		67.9		4.3		6
Total Wealth Management Trust, Investment and Other Servicing Fees	$	418.9	$	415.6	$	3.3	1	%
Total Consolidated Trust, Investment and Other Servicing Fees	$	1,003.8	$	975.5	$	28.3	3	%

Corporate & Institutional Services

Custody and fund administration fees, the largest component of C&IS fees, are driven primarily by values of client assets under custody/administration (AUC/A), transaction volumes and number of accounts. The asset values used to calculate these fees vary depending on the individual fee arrangements negotiated with each client. Custody fees related to asset values are client specific and are priced based on month-end market values, quarter-end market values, or the average of month-end market values for the quarter. The fund administration fees that are asset-value-related are priced using month-end, quarter-end, or average daily balances. Investment management fees are based generally on market values of client assets under management throughout the period. Typically, the asset values used to calculate fee revenue are based on a one-month or one-quarter lag.

Custody and fund administration fees increased from the prior-year quarter, primarily due to favorable currency translation and new business, partially offset by unfavorable markets. Investment management fees increased from the prior-year quarter, primarily due to new business.

Wealth Management

Wealth Management fee income is calculated primarily based on market values and is impacted by both one-month and one-quarter lagged asset values. Wealth Management fees increased compared to the prior-year quarter, primarily due to favorable markets, partially offset by higher money market mutual fund waivers.

5

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Trust, Investment and Other Servicing Fees (continued)

Market Indices

The following tables present selected market indices and the percentage changes year over year to provide context regarding equity and fixed income market impacts on the Corporation’s results.

TABLE 2: EQUITY MARKET INDICES

	DAILY AVERAGES				PERIOD-END
	THREE MONTHS ENDED SEPTEMBER 30,				AS OF SEPTEMBER 30,
	2020	2019	CHANGE		2020	2019	CHANGE
S&P 500	3,316	2,958	12	%	3,363	2,977	13	%
MSCI EAFE (U.S. dollars)	1,871	1,882	(1)		1,855	1,889	(2)
MSCI EAFE (local currency)	1,068	1,118	(4)		1,057	1,135	(7)

TABLE 3: FIXED INCOME MARKET INDICES

	AS OF SEPTEMBER 30,
	2020	2019	CHANGE
Barclays Capital U.S. Aggregate Bond Index	2,376	2,221	7	%
Barclays Capital Global Aggregate Bond Index	541	509	6

Client Assets

As noted above, AUC/A and assets under management are two of the primary drivers of our trust, investment and other servicing fees. For the purposes of disclosing AUC/A, to the extent that both custody and administration services are provided, the value of the assets is included only once. The following table presents AUC/A by reporting segment.

TABLE 4: ASSETS UNDER CUSTODY / ADMINISTRATION BY REPORTING SEGMENT

	SEPTEMBER 30, 2020		JUNE 30, 2020		SEPTEMBER 30, 2019		CHANGE Q3-20/Q2-20		CHANGE Q3-20/Q3-19
($ In Billions)
Corporate & Institutional Services	$	12,263.2	$	11,347.1	$	10,864.0	8	%	13	%
Wealth Management	814.4		751.2		701.2		8		16
Total Assets Under Custody / Administration	$	13,077.6	$	12,098.3	$	11,565.2	8	%	13	%

The following table presents Northern Trust’s assets under custody, a component of AUC/A, by reporting segment.

TABLE 5: ASSETS UNDER CUSTODY BY REPORTING SEGMENT

	SEPTEMBER 30, 2020		JUNE 30, 2020		SEPTEMBER 30, 2019		CHANGE Q3-20/Q2-20		CHANGE Q3-20/Q3-19
($ In Billions)
Corporate & Institutional Services	$	9,312.2	$	8,542.7	$	8,061.4	9	%	16	%
Wealth Management	810.4		747.9		698.7		8		16
Total Assets Under Custody	$	10,122.6	$	9,290.6	$	8,760.1	9	%	16	%

Consolidated assets under custody increased from the prior quarter and prior-year quarter, primarily reflecting net inflows, the impact of favorable markets, and favorable currency translation.

The following table presents the allocation of Northern Trust’s custodied assets by reporting segment.

TABLE 6: ALLOCATION OF ASSETS UNDER CUSTODY

	SEPTEMBER 30, 2020						JUNE 30, 2020						SEPTEMBER 30, 2019
	C&IS		WM		TOTAL		C&IS		WM		TOTAL		C&IS		WM		TOTAL
Equities	44	%	60	%	44	%	43	%	59	%	44	%	43	%	57	%	45	%
Fixed Income Securities	37		16		36		38		17		36		39		19		37
Cash and Other Assets	17		24		18		17		24		18		16		24		16
Securities Lending Collateral	2		—		2		2		—		2		2		—		2

6

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Trust, Investment and Other Servicing Fees (continued)

The following table presents Northern Trust’s assets under custody by investment type.

TABLE 7: ASSETS UNDER CUSTODY BY INVESTMENT TYPE

($ In Billions)	SEPTEMBER 30, 2020		JUNE 30, 2020		SEPTEMBER 30, 2019		CHANGE Q3-20/Q2-20		CHANGE Q3-20/Q3-19
Equities	$	4,532.2	$	4,102.8	$	3,902.4	10	%	16	%
Fixed Income Securities	3,614.6		3,337.1		3,243.5		8		11
Cash and Other Assets	1,802.9		1,685.0		1,435.8		7		26
Securities Lending Collateral	172.9		165.7		178.4		4		(3)
Total Assets Under Custody	$	10,122.6	$	9,290.6	$	8,760.1	9	%	16	%

The following table presents Northern Trust’s assets under management by reporting segment.

TABLE 8: ASSETS UNDER MANAGEMENT BY REPORTING SEGMENT

	SEPTEMBER 30, 2020		JUNE 30, 2020		SEPTEMBER 30, 2019		CHANGE Q3-20/Q2-20		CHANGE Q3-20/Q3-19
($ In Billions)
Corporate & Institutional Services	$	993.2	$	954.0	$	901.3	4	%	10	%
Wealth Management	318.5		303.8		300.5		5		6
Total Assets Under Management	$	1,311.7	$	1,257.8	$	1,201.8	4	%	9	%

Consolidated assets under management increased compared to the prior quarter primarily reflecting favorable markets and favorable currency translation. Consolidated assets under management increased compared to the prior-year quarter, primarily reflecting favorable markets and net inflows.

The following table presents the allocation of Northern Trust’s assets under management by reporting segment.

TABLE 9: ALLOCATION OF ASSETS UNDER MANAGEMENT

	SEPTEMBER 30, 2020						JUNE 30, 2020						SEPTEMBER 30, 2019
	C&IS		WM		TOTAL		C&IS		WM		TOTAL		C&IS		WM		TOTAL
Equities	50	%	49	%	50	%	48	%	48	%	49	%	50	%	52	%	50	%
Fixed Income Securities	12		26		15		12		26		15		13		26		16
Cash and Other Assets	21		25		22		23		26		23		17		22		19
Securities Lending Collateral	17		—		13		17		—		13		20		—		15

The following table presents Northern Trust’s assets under management by investment type.

TABLE 10: ASSETS UNDER MANAGEMENT BY INVESTMENT TYPE

($ In Billions)	SEPTEMBER 30, 2020		JUNE 30, 2020		SEPTEMBER 30, 2019		CHANGE Q3-20/Q2-20		CHANGE Q3-20/Q3-19
Equities	$	648.8	$	608.5	$	607.4	7	%	7	%
Fixed Income Securities	201.6		193.1		190.9		4		6
Cash and Other Assets	288.4		290.5		225.1		(1)		28
Securities Lending Collateral	172.9		165.7		178.4		4		(3)
Total Assets Under Management	$	1,311.7	$	1,257.8	$	1,201.8	4	%	9	%

7

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Trust, Investment and Other Servicing Fees (continued)

The following table presents activity in consolidated assets under management by product.

TABLE 11: ACTIVITY IN CONSOLIDATED ASSETS UNDER MANAGEMENT BY PRODUCT

		THREE MONTHS ENDED
($ In Billions)		SEPTEMBER 30, 2020		JUNE 30, 2020		MARCH 31, 2020		DECEMBER 31, 2019		SEPTEMBER 30, 2019
Beginning Balance of AUM		$	1,257.8	$	1,119.3	$	1,231.3	$	1,201.8	$	1,180.2
Inflows by Product
	Equities	42.6		46.7		51.7		50.7		41.7
	Fixed Income Securities	16.4		16.4		13.5		9.5		10.3
	Cash and Other Assets	189.9		219.3		204.7		135.2		144.5
	Securities Lending Collateral	57.2		67.7		79.7		57.0		69.2
Total Inflows		306.1		350.1		349.6		252.4		265.7
Outflows by Product
	Equities	(48.3)		(46.3)		(59.9)		(52.5)		(53.0)
	Fixed Income Securities	(13.9)		(18.5)		(18.6)		(7.8)		(13.8)
	Cash and Other Assets	(195.3)		(180.0)		(168.2)		(139.3)		(128.7)
	Securities Lending Collateral	(50.0)		(69.1)		(75.7)		(72.2)		(54.3)
Total Outflows		(307.5)		(313.9)		(322.4)		(271.8)		(249.8)
Net Inflows (Outflows)		(1.4)		36.2		27.2		(19.4)		15.9
Market Performance, Currency & Other
	Market Performance & Other	51.4		99.5		(132.8)		43.6		10.6
	Currency	3.9		2.8		(6.4)		5.3		(4.9)
Total Market Performance, Currency & Other		55.3		102.3		(139.2)		48.9		5.7
Ending Balance of AUM		$	1,311.7	$	1,257.8	$	1,119.3	$	1,231.3	$	1,201.8

Other Noninterest Income

The components of noninterest income are provided below.

TABLE 12: OTHER NONINTEREST INCOME

	THREE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020		2019		CHANGE
Foreign Exchange Trading Income	$	61.6	$	59.7	$	1.9	3	%
Treasury Management Fees	11.6		11.2		0.4		3
Security Commissions and Trading Income	26.0		29.1		(3.1)		(10)
Other Operating Income	53.5		45.1		8.4		19
Investment Security Gains (Losses), net	—		(0.4)		0.4		N/M
Total Other Noninterest Income	$	152.7	$	144.7	$	8.0	6	%

Foreign exchange trading income increased compared to the prior-year quarter, primarily due to increased market volatility.

Other operating income increased compared to the prior-year quarter, primarily due to income related to a bank-owned life insurance program and higher miscellaneous income. The higher miscellaneous income was primarily associated with a market value increase in the supplemental compensation plans, which also resulted in a related increase in supplemental compensation plans expense in other operating expense.

The components of other operating income are provided in the following table.

TABLE 13: OTHER OPERATING INCOME

	THREE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020		2019		CHANGE
Loan Service Fees	$	13.6	$	11.9	$	1.7	14	%
Banking Service Fees	11.8		11.2		0.6		6
Other Income	28.1		22.0		6.1		27
Total Other Operating Income	$	53.5	$	45.1	$	8.4	19	%

8

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income

Net interest income is defined as the total of interest income and amortized fees on earning assets, less interest expense on deposits and borrowed funds, adjusted for the impact of interest-related hedging activity. Earning assets — including federal funds sold, securities purchased under agreements to resell, interest-bearing due from banks and interest-bearing deposits with banks, Federal Reserve and other central bank deposits and other, securities, and loans and leases — are financed by a large base of interest-bearing funds that include client deposits, short-term borrowings, senior notes and long-term debt. Earning assets are also funded by noninterest-related funds, which include demand deposits and stockholders’ equity. Net interest income is subject to variations in the level and mix of earning assets and interest-bearing funds and their relative sensitivity to interest rates. In addition, the levels of nonaccruing assets and client compensating deposit balances used to pay for services impact net interest income.

Net interest margin is the difference between what we earn on our assets and what we pay for deposits and other sources of funding. The direction and level of interest rates are important factors in our earnings. Net interest margin is calculated by dividing annualized net interest income by average interest-earning assets.

Net interest income stated on a fully taxable equivalent (FTE) basis is a non-generally accepted accounting principle (GAAP) financial measure that facilitates the analysis of asset yields. Management believes an FTE presentation provides a clearer indication of net interest margins for comparative purposes. When adjusted to an FTE basis, yields on taxable, nontaxable, and partially taxable assets are comparable; however, the adjustment to an FTE basis has no impact on net income. A reconciliation of net interest income on a GAAP basis to net interest income on an FTE basis is provided on page 35.

9

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income (continued)

The following tables present an analysis of average balances and interest rates affecting net interest income and an analysis of net interest income changes.

TABLE 14: AVERAGE CONSOLIDATED BALANCE SHEETS WITH ANALYSIS OF NET INTEREST INCOME

(INTEREST AND RATE ON A FULLY TAXABLE EQUIVALENT BASIS)	THIRD QUARTER
	2020						2019
($ In Millions)	INTEREST		AVERAGE BALANCE		AVERAGE RATE(6)		INTEREST		AVERAGE BALANCE		AVERAGE RATE(6)
Average Earning Assets
Federal Reserve and Other Central Bank Deposits and Other(1)	$	1.8	$	31,602.3	0.02	%	$	40.4	$	17,524.9	0.91	%
Interest-Bearing Due from and Deposits with Banks(2)	2.7		4,816.1		0.23		18.6		5,656.5		1.31
Federal Funds Sold and Securities Purchased under Agreements to Resell	0.9		1,792.3		0.21		4.0		816.9		1.93
Securities
U.S. Government	13.2		4,290.9		1.23		28.2		5,506.5		2.03
Obligations of States and Political Subdivisions	12.3		2,319.3		2.12		5.6		906.6		2.46
Government Sponsored Agency	88.5		24,027.6		1.46		147.6		22,494.1		2.60
Other(3)	76.0		27,434.3		1.10		91.2		21,117.7		1.72
Total Securities	190.0		58,072.1		1.30		272.6		50,024.9		2.16
Loans and Leases(4)	167.9		33,085.2		2.02		292.8		30,935.9		3.75
Total Earning Assets	363.3		129,368.0		1.12		628.4		104,959.1		2.38
Allowance for Credit Losses	—		(218.4)		—		—		(111.2)		—
Cash and Due from Banks and Other Central Bank Deposits(5)	—		2,293.3		—		—		2,551.5		—
Buildings and Equipment	—		512.2		—		—		411.9		—
Client Security Settlement Receivables	—		1,155.0		—		—		1,089.6		—
Goodwill	—		697.8		—		—		680.4		—
Other Assets	—		7,117.5		—		—		6,770.8		—
Total Assets	$	—	$	140,925.4	—	%	$	—	$	116,352.1	—	%
Average Source of Funds
Deposits
Savings, Money Market and Other	$	5.6	$	24,305.4	0.09	%	$	46.0	$	17,802.7	1.03	%
Savings Certificates and Other Time	4.0		1,502.1		1.07		4.6		898.9		2.01
Non-U.S. Offices — Interest-Bearing	(13.1)		61,834.9		(0.08)		71.4		53,631.5		0.53
Total Interest-Bearing Deposits	(3.5)		87,642.4		(0.02)		122.0		72,333.1		0.67
Short-Term Borrowings	5.1		6,628.7		0.30		50.0		8,768.8		2.26
Senior Notes	19.1		3,666.3		2.08		19.6		2,587.7		3.00
Long-Term Debt	5.7		1,199.0		1.91		9.4		1,156.7		3.21
Floating Rate Capital Debt	0.4		277.7		0.64		2.1		277.7		2.89
Total Interest-Related Funds	26.8		99,414.1		0.11		203.1		85,124.0		0.95
Interest Rate Spread	—		—		1.01		—		—		1.43
Demand and Other Noninterest-Bearing Deposits	—		25,202.3		—		—		16,687.3		—
Other Liabilities	—		4,906.1		—		—		3,853.0		—
Stockholders’ Equity	—		11,402.9		—		—		10,687.8		—
Total Liabilities and Stockholders’ Equity	$	—	$	140,925.4	—	%	$	—	$	116,352.1	—	%
Net Interest Income/Margin (FTE Adjusted)	$	336.5	$	—	1.03	%	$	425.3	$	—	1.61	%
Net Interest Income/Margin (Unadjusted)	$	328.6	$	—	1.01	%	$	417.7	$	—	1.58	%

10

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income (continued)

ANALYSIS OF NET INTEREST INCOME CHANGES

DUE TO VOLUME AND RATE⁽⁷⁾

	THREE MONTHS ENDED SEPTEMBER 30, 2020/2019
	CHANGE DUE TO
(In Millions)	AVERAGE BALANCE		AVERAGE RATE		NET (DECREASE) INCREASE
Earning Assets (FTE)	$	114.6	$	(379.7)	$	(265.1)
Interest-Related Funds	21.7		(198.0)		(176.3)
Increase (Decrease) in Net Interest Income (FTE)	$	92.9	$	(181.7)	$	(88.8)

⁽¹⁾Federal Reserve and Other Central Bank Deposits and Other includes collateral deposits with certain securities depositories and clearing houses, which are classified in Other Assets on the consolidated balance sheets.

⁽²⁾Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

⁽³⁾Other securities include certain community development investments and Federal Home Loan Bank and Federal Reserve stock, which are classified in Other Assets on the consolidated balance sheets.

⁽⁴⁾Average balances include nonaccrual loans. Lease financing receivable balances are reduced by deferred income.

⁽⁵⁾Cash and Due from Banks and Other Central Bank Deposits includes the noninterest-bearing component of Federal Reserve and Other Central Bank Deposits as presented on the consolidated balance sheets.

⁽⁶⁾Rate calculations are based on actual balances rather than the rounded amounts presented in the Average Consolidated Balance Sheets with Analysis of Net Interest Income.

⁽⁷⁾Changes not due solely to average balance changes or rate changes are allocated proportionately to average balance and rate based on their relative absolute magnitudes.

Notes:    Net Interest Income (FTE Adjusted), a non-GAAP financial measure, includes adjustments to a fully taxable equivalent basis for loans and securities. The adjustments are based on a federal income tax rate of 21.0%, where the rate is adjusted for applicable state income taxes, net of related federal tax benefit. Total taxable equivalent interest adjustments amounted to $7.9 million and $7.6 million for the three months ended September 30, 2020 and 2019, respectively. A reconciliation of net interest income and net interest margin on a GAAP basis to net interest income and net interest margin on an FTE basis (each of which is a non-GAAP financial measure) is provided on page 35. Net interest margin is calculated by dividing annualized net interest income by average interest-earning assets.

Interest revenue on cash collateral positions is reported above within Interest-Bearing Due from and Deposits with Banks and within Loans and Leases. Interest expense on cash collateral positions is reported above within Non-U.S. Offices Interest-Bearing Deposits. Related cash collateral received from and deposited with derivative counterparties is recorded net of the associated derivative contract within Other Assets and Other Liabilities, respectively.

Net interest income, stated on a FTE basis, decreased from the prior-year quarter, primarily due to a lower net interest margin, partially offset by an increase in average earning assets. Average earning assets increased primarily due to higher levels of short-term interest-bearing deposits with banks, securities, and loans. Funding of the balance sheet reflected higher levels of client deposits.

The net interest margin on an FTE basis decreased from the prior-year quarter, primarily due to lower interest rates and a balance sheet mix shift. Low levels of market interest rates are expected to continue to impact our net interest income.

Federal Reserve and other central bank deposits and other averaged $31.6 billion and increased $14.1 billion, or 80%, from $17.5 billion in the prior-year quarter, resulting from significant deposit inflows. The higher level of client deposits were primarily placed with the Federal Reserve and other central banks and in the securities portfolio. Average securities were $58.1 billion and increased $8.1 billion, or 16%, from $50.0 billion, in the prior-year quarter and include certain community development investments, Federal Home Loan Bank stock, and Federal Reserve stock of $740.7 million, $177.3 million and $69.7 million, respectively, which are recorded in Other Assets on the consolidated balance sheets.

Loans and leases averaged $33.1 billion and increased $2.2 billion, or 7%, from $30.9 billion in the prior-year quarter, primarily reflecting higher levels of private client, commercial and institutional, and commercial real estate loans. Commercial and institutional loans averaged $10.0 billion and increased $1.1 billion, or 13%, from $8.9 billion for the prior-year quarter. Private client loans averaged $11.7 billion and increased $1.3 billion, or 13%, from $10.4 billion for the prior-year quarter. Commercial real estate loans averaged $3.3 billion and increased $0.5 billion, or 17%, from $2.8 billion for the prior-year quarter. Residential real estate loans averaged $6.1 billion in the current and prior-year quarter.

Northern Trust utilizes a diverse mix of funding sources. Total interest-bearing deposits increased $15.3 billion, or 21%, to an average of $87.6 billion in the current quarter from $72.3 billion in the prior-year quarter. Other interest-bearing funds decreased $1.0 billion, or 8%, to an average of $11.8 billion in the current quarter from $12.8 billion in the prior-year quarter. The balances within short-term borrowing classifications vary based on funding requirements and strategies, interest rate levels, changes in the volume of lower-cost deposit sources, and the availability of collateral to secure these borrowings. Average net noninterest-related funds increased $10.2 billion, or 51%, to $30.0 billion in the current quarter from $19.8 billion in the prior-year quarter, primarily resulting from higher levels of demand and other noninterest-bearing deposits and other liabilities.

Interest expense for interest-bearing deposits in the current quarter was driven by low and negative interest rates for non-U.S. offices interest-bearing deposits and low interest rates on domestic interest-bearing deposits. Average non-U.S. offices interest-bearing deposits comprised 71% of total average interest-bearing deposits for the three months ended September 30, 2020.

11

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Provision for Credit Losses

The Corporation adopted ASU No. 2016-13, “Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments” (ASU 2016-13) on January 1, 2020, which significantly changed the way impairment of financial instruments is recognized by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of financial instruments. For more information on the adoption of ASU 2016-13, please refer to Note 2 — Recent Accounting Pronouncements to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

There was a $0.5 million provision for credit losses in the current quarter, as compared to a credit provision of $7.0 million in the prior-year quarter. The provision in the current quarter was primarily due to an increase in the reserve evaluated on a collective basis, which relates to pooled financial assets sharing similar risk characteristics. The increase in the collective basis reserve was driven by projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with increases in the private client, commercial real estate, and residential real estate portfolios, partially offset by a decrease in the commercial and institutional portfolio. The overall increase in the reserve on a collective basis was partially offset by a decrease in the reserve associated with loans evaluated on an individual basis. The credit provision in the prior-year quarter was primarily driven by a decrease in the specific allowance attributable to the residential real estate portfolio and a slight decrease in the inherent allowance under the previous “incurred loss” model.

Net recoveries in the current quarter were $0.4 million, resulting from charge-offs of $0.8 million and recoveries of $1.2 million. The prior-year quarter included $0.6 million of net recoveries, reflecting $1.1 million of charge-offs and $1.7 million of recoveries. Nonaccrual assets of $98.9 million decreased $17.4 million, or 15%, from $116.3 million at the end of the prior-year quarter.

Noninterest Expense

The components of noninterest expense are provided in the following table.

TABLE 15: NONINTEREST EXPENSE

	THREE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020		2019		CHANGE
Compensation	$	461.7	$	458.0	$	3.7	1	%
Employee Benefits	97.5		87.6		9.9		11
Outside Services	186.0		194.0		(8.0)		(4)
Equipment and Software	170.7		151.7		19.0		13
Occupancy	51.8		53.0		(1.2)		(2)
Other Operating Expense	127.0		92.0		35.0		38
Total Noninterest Expense	$	1,094.7	$	1,036.3	$	58.4	6	%

Compensation expense, the largest component of noninterest expense, increased compared to the prior-year quarter, primarily reflecting higher salary expense driven by staff growth, base pay adjustments and unfavorable currency translation, partially offset by lower cash-based incentives and lower long-term performance-based incentive expense.

Employee benefits expense increased compared to the prior-year quarter primarily due to higher retirement plan expenses.

Outside services expense decreased compared to the prior-year quarter, primarily reflecting lower technical services costs, consulting services, and third-party advisory fees.

Equipment and software expense increased compared to the prior-year quarter, primarily reflecting higher depreciation and amortization and software support costs.

Other operating expense increased compared to the prior-year quarter, primarily due to a $43.4 million charge related to a corporate action processing error, increases in mutual fund co-administration fees, and higher supplemental compensation plans expense, partially offset by lower business promotion expenses due to reduced business travel and lower staff-related expenses. The higher supplemental compensation plans expense resulted in a related increase in miscellaneous income reported in noninterest income.

12

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Expense (continued)

The components of other operating expense are provided in the following table.

TABLE 16: OTHER OPERATING EXPENSE

	THREE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020		2019		CHANGE
Business Promotion	$	23.4	$	38.7	$	(15.3)	(40)	%
Staff Related	11.8		11.6		0.2		2
FDIC Insurance Premiums	3.2		2.4		0.8		32
Other Intangibles Amortization	4.3		4.2		0.1		5
Other Expenses	84.3		35.1		49.2		139
Total Other Operating Expense	$	127.0	$	92.0	$	35.0	38	%

Provision for Income Taxes

Income tax expense for the three months ended September 30, 2020 was $95.4 million, representing an effective tax rate of 24.5%, compared to $124.0 million in the prior-year quarter, representing an effective tax rate of 24.4%.

The provision for income taxes decreased primarily due to decreased income before income taxes.

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS

Overview of Financial Results

Net income per diluted common share decreased in the current period to $4.34 from $4.92 in the comparable prior-year period. Net income decreased $152.7 million, or 14%, to $968.4 million in the current period from $1.12 billion in the prior-year period. Annualized return on average common equity was 12.0% in the current period and 14.9% in the prior-year period. The annualized return on average assets was 0.96% in the current period compared to 1.28% in the prior-year period.

Revenue for the nine months ended September 30, 2020 increased $53.5 million, or 1%, from $4.53 billion in the prior-year period to $4.58 billion in the current period.

Trust, Investment and Other Servicing Fees increased $109.0 million, or 4%, from $2.86 billion in the prior-year period to $2.97 billion in the current period, primarily driven by new business and favorable markets.

Other noninterest income increased $92.8 million, or 23%, from $408.4 million in the prior-year period to $501.2 million in the current period, primarily driven by increased foreign exchange trading income, other operating income, and security commissions and trading income.

Net interest income decreased $148.3 million, or 12%, to $1.11 billion in the current period from $1.26 billion in the prior-year period, primarily due to a lower net interest margin, partially offset by an increase in average earning assets.

There was a $127.5 million provision for credit losses in the current period, as compared to a credit provision of $13.5 million in the prior-year period.

The Corporation adopted ASU No. 2016-13, “Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments” (ASU 2016-13) on January 1, 2020, which significantly changed the way impairment of financial instruments is recognized by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of financial instruments. Upon adoption of ASU 2016-13, the Corporation recorded a $13.7 million increase in the allowance for credit losses with a corresponding cumulative effect adjustment to decrease retained earnings by $10.1 million, net of income taxes. For more information on the adoption of ASU 2016-13, please refer to Note 2 — Recent Accounting Pronouncements to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

Noninterest expense increased $126.0 million, or 4%, from $3.07 billion in the prior-year period to $3.20 billion in the current period, primarily attributable to higher equipment and software expense, other operating expense, compensation expense, employee benefits expense and occupancy expense, partially offset by lower outside services expense. The increase in other operating expense was primarily due to a $43.4 million charge related to a corporate action processing error.

13

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Overview of Financial Results (continued)

The provision for income taxes for the nine months ended September 30, 2020 totaled $285.8 million, representing an effective tax rate of 22.8%. The provision for income taxes for the nine months ended September 30, 2019 totaled $346.6 million, representing an effective tax rate of 23.6%.

Trust, Investment and Other Servicing Fees

The components of trust, investment and other servicing fees are provided in the table below.

TABLE 17: TRUST, INVESTMENT AND OTHER SERVICING FEES

	NINE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020		2019		CHANGE
C&IS Trust, Investment and Other Servicing Fees
Custody and Fund Administration	$	1,166.2	$	1,152.4	$	13.8	1	%
Investment Management	386.0		329.8		56.2		17
Securities Lending	70.4		64.6		5.8		9
Other	102.9		97.7		5.2		5
Total C&IS Trust, Investment and Other Servicing Fees	$	1,725.5	$	1,644.5	$	81.0	5	%
Wealth Management Trust, Investment and Other Servicing Fees
Central	$	452.6	$	461.1	$	(8.5)	(2)	%
East	326.6		312.0		14.6		5
West	251.7		245.9		5.8		2
Global Family Office	212.5		196.4		16.1		8
Total Wealth Management Trust, Investment and Other Servicing Fees	$	1,243.4	$	1,215.4	$	28.0	2	%
Total Consolidated Trust, Investment and Other Servicing Fees	$	2,968.9	$	2,859.9	$	109.0	4	%

Corporate & Institutional Services

Custody and fund administration fees, the largest component of C&IS fees, increased primarily driven by new business. Investment management fees increased primarily due to new business and favorable markets. Securities lending fees increased primarily driven by higher spreads.

Wealth Management

Wealth Management fees increased primarily attributable to favorable markets and new business, partially offset by higher money market mutual fund waivers.

Other Noninterest Income

The components of other noninterest income are provided in the following table.

TABLE 18: OTHER NONINTEREST INCOME

	NINE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020		2019		CHANGE
Foreign Exchange Trading Income	$	221.8	$	186.4	$	35.4	19	%
Treasury Management Fees	34.0		34.1		(0.1)		—
Security Commissions and Trading Income	100.9		75.8		25.1		33
Other Operating Income	144.4		113.0		31.4		28
Investment Security (Losses) Gains, net	0.1		(0.9)		1.0		N/M
Total Other Noninterest Income	$	501.2	$	408.4	$	92.8	23	%

Foreign exchange trading income increased from the prior-year period, primarily due to higher client volumes and increased market volatility, partially offset by lower foreign exchange swap activity in Treasury.

Security commissions and trading income increased from the prior-year period, primarily due to higher core brokerage revenue, revenue from interest rate swaps, and referral fees.

Other operating income increased from the prior-year period, primarily due to income related to a bank-owned life insurance program, lower expenses for existing swap agreements related to Visa Inc. Class B common shares, and higher miscellaneous

14

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Other Noninterest Income (continued)

income. The higher miscellaneous income was primarily associated with a market value increase in the supplemental compensation plans, which also resulted in a related increase in supplemental compensation plans expense in other operating expense.

The components of other operating income are provided in the following table.

TABLE 19: OTHER OPERATING INCOME

	NINE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020		2019		CHANGE
Loan Service Fees	$	37.3	$	36.5	$	0.8	2	%
Banking Service Fees	34.1		33.7		0.4		1
Other Income	73.0		42.8		30.2		70
Total Other Operating Income	$	144.4	$	113.0	$	31.4	28	%

15

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income

The following tables present an analysis of average balances and interest rate changes affecting net interest income and an analysis of net interest income changes.

TABLE 20: AVERAGE CONSOLIDATED BALANCE SHEETS WITH ANALYSIS OF NET INTEREST INCOME

(INTEREST AND RATE ON A FULLY TAXABLE EQUIVALENT BASIS)	NINE MONTHS ENDED SEPTEMBER 30,
	2020						2019
($ In Millions)	INTEREST		AVERAGE BALANCE		AVERAGE RATE(6)		INTEREST		AVERAGE BALANCE		AVERAGE RATE(6)
Average Earning Assets
Federal Reserve and Other Central Bank Deposits and Other(1)	$	28.2	$	27,258.4	0.14	%	$	147.8	$	18,965.1	1.04	%
Interest-Bearing Due from and Deposits with Banks(2)	20.0		5,384.6		0.50		55.7		5,970.6		1.25
Federal Funds Sold and Securities Purchased under Agreements to Resell	3.1		1,150.9		0.36		15.1		814.7		2.47
Securities
U.S. Government	52.6		4,466.8		1.58		84.6		5,299.5		2.13
Obligations of States and Political Subdivisions	34.0		1,960.5		2.31		15.7		816.4		1.92
Government Sponsored Agency	321.6		23,598.8		1.82		446.5		22,479.7		2.65
Other(3)	245.5		24,294.2		1.35		286.1		21,672.7		1.77
Total Securities	653.7		54,320.3		1.61		832.9		50,268.4		2.22
Loans and Leases(4)	609.6		33,634.0		2.42		895.4		31,073.8		3.85
Total Earning Assets	1,314.6		121,748.2		1.44		1,946.9		107,092.6		2.43
Allowance for Credit Losses	—		(163.1)		—		—		(113.4)		—
Cash and Due from Banks and Other Central Bank Deposits(5)	—		2,659.8		—		—		2,427.7		—
Buildings and Equipment	—		506.9		—		—		416.2		—
Client Security Settlement Receivables	—		1,327.2		—		—		1,039.0		—
Goodwill	—		693.3		—		—		679.1		—
Other Assets	—		7,872.9		—		—		5,823.5		—
Total Assets	$	—	$	134,645.2	—	%	$	—	$	117,364.7	—	%
Average Source of Funds
Deposits
Savings, Money Market and Other	$	43.2	$	22,863.2	0.25	%	$	123.6	$	16,054.7	1.03	%
Savings Certificates and Other Time	13.6		1,289.3		1.41		11.6		850.1		1.81
Non-U.S. Offices — Interest-Bearing	(0.1)		59,997.0		—		268.3		55,545.5		0.65
Total Interest-Bearing Deposits	56.7		84,149.5		0.09		403.5		72,450.3		0.74
Short-Term Borrowings	43.7		7,892.0		0.74		173.4		9,557.2		2.43
Senior Notes	57.0		3,206.5		2.37		54.0		2,323.2		3.10
Long-Term Debt	21.1		1,188.7		2.38		29.4		1,133.9		3.46
Floating Rate Capital Debt	3.6		277.7		1.76		6.4		277.6		3.11
Total Interest-Related Funds	182.1		96,714.4		0.25		666.7		85,742.2		1.04
Interest Rate Spread	—		—		1.19		—		—		1.39
Demand and Other Noninterest-Bearing Deposits	—		22,141.4		—		—		17,453.1		—
Other Liabilities	—		4,711.1		—		—		3,616.8		—
Stockholders’ Equity	—		11,078.3		—		—		10,552.6		—
Total Liabilities and Stockholders’ Equity	$	—	$	134,645.2	—	%	$	—	$	117,364.7	—	%
Net Interest Income/Margin (FTE Adjusted)	$	1,132.5	$	—	1.24	%	$	1,280.2	$	—	1.60	%
Net Interest Income/Margin (Unadjusted)	$	1,108.8	$	—	1.22	%	$	1,257.1	$	—	1.57	%

16

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income (continued)

ANALYSIS OF NET INTEREST INCOME CHANGES

DUE TO VOLUME AND RATE⁽⁷⁾

	NINE MONTHS ENDED SEPTEMBER 30, 2020/2019
	CHANGE DUE TO
(In Millions)	AVERAGE BALANCE		AVERAGE RATE		NET (DECREASE) INCREASE
Earning Assets (FTE)	$	234.6	$	(866.9)	$	(632.3)
Interest-Related Funds	55.1		(539.7)		(484.6)
Increase (Decrease) in Net Interest Income (FTE)	$	179.5	$	(327.2)	$	(147.7)

⁽¹⁾Federal Reserve and Other Central Bank Deposits and Other includes collateral deposits with certain securities depositories and clearing houses, which are classified in Other Assets on the consolidated balance sheets.

⁽²⁾Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

⁽³⁾Other securities include certain community development investments and Federal Home Loan Bank and Federal Reserve stock, which are classified in Other Assets on the consolidated balance sheets.

⁽⁴⁾Average balances include nonaccrual loans. Lease financing receivable balances are reduced by deferred income.

⁽⁵⁾Cash and Due from Banks and Other Central Bank Deposits includes the noninterest-bearing component of Federal Reserve and Other Central Bank Deposits as presented on the consolidated balance sheets.

⁽⁶⁾Rate calculations are based on actual balances rather than the rounded amounts presented in the Average Consolidated Balance Sheets with Analysis of Net Interest Income.

⁽⁷⁾Changes not due solely to average balance changes or rate changes are allocated proportionately to average balance and rate based on their relative absolute magnitudes.

Notes:    Net Interest Income (FTE Adjusted), a non-GAAP financial measure, includes adjustments to a fully taxable equivalent basis for loans and securities. The adjustments are based on a federal income tax rate of 21.0%, where the rate is adjusted for applicable state income taxes, net of related federal tax benefit. Total taxable equivalent interest adjustments amounted to $23.7 million and $23.1 million for the nine months ended September 30, 2020 and 2019, respectively. A reconciliation of net interest income and net interest margin on a GAAP basis to net interest income and net interest margin on an FTE basis (each of which is a non-GAAP financial measure) is provided on page 35. Net interest margin is calculated by dividing annualized net interest income by average interest-earning assets.

Interest revenue on cash collateral positions is reported above within Interest-Bearing Due from and Deposits with Banks and within Loans and Leases. Interest expense on cash collateral positions is reported above within Non-U.S. Offices Interest-Bearing Deposits. Related cash collateral received from and deposited with derivative counterparties is recorded net of the associated derivative contract within Other Assets and Other Liabilities, respectively.

Net interest income, stated on an FTE basis, decreased from the prior-year period, primarily due to a lower net interest margin, partially offset by an increase in average earning assets. Average earning assets increased primarily due to higher levels of short-term interest-bearing deposits with banks, securities, and loans. Funding of the balance sheet reflected higher levels of client deposits. The increase in average client deposit balance resulted from the large inflows experienced at the end of the first quarter caused by client reaction to current economic and market conditions. Average non-U.S. offices interest-bearing deposits comprised 71% of total average interest-bearing deposits for the nine months ended September 30, 2020.

The net interest margin on an FTE basis decreased from the prior-year period, primarily due to lower interest rates. Low levels of market interest rates are expected to continue to impact our net interest income.

Federal Reserve and other central bank deposits and other averaged $27.3 billion and increased $8.3 billion, or 44%, from $19.0 billion in the prior-year period, resulting from significant deposit inflows. The higher level of client deposits were primarily placed with the Federal Reserve and other central banks and in the securities portfolio. Average securities were $54.3 billion and increased $4.1 billion, or 8%, from $50.2 billion in the prior-year period and include certain community development investments, Federal Home Loan Bank stock, and Federal Reserve stock of $741.1 million, $211.0 million and $61.4 million, respectively, which are recorded in Other Assets on the consolidated balance sheets.

Loans and leases averaged $33.6 billion and increased $2.5 billion, or 8%, from $31.1 billion in the prior-year period, primarily reflecting higher levels of commercial and institutional, private client, and commercial real estate loans, partially offset by lower levels of residential real estate loans. Commercial and institutional loans averaged $10.5 billion and increased $1.5 billion, or 18%, from $9.0 billion for the prior-year period. Private client loans averaged $11.4 billion and increased $720.1 million, or 7%, from $10.7 billion for the prior-year period. Commercial real estate loans averaged $3.2 billion and increased $293.9 million, or 10%, from $2.9 billion for the prior-year period. Residential real estate loans averaged $6.1 billion and decreased $238.0 million, or 4%, from $6.4 billion for the prior-year period.

Northern Trust utilizes a diverse mix of funding sources. Total interest-bearing deposits increased $11.6 billion, or 16%, to an average of $84.1 billion in the current period from $72.5 billion in the prior-year period. Other interest-bearing funds decreased $727.0 million, or 5%, to an average of $12.6 billion in the current period from $13.3 billion in the prior-year period. The balances within short-term borrowing classifications vary based on funding requirements and strategies, interest rate levels, changes in the volume of lower-cost deposit sources, and the availability of collateral to secure these borrowings. Average net noninterest-related funds increased $3.6 billion, or 17%, to $25.0 billion in the current period from $21.4 billion in the prior-year period primarily resulting from higher levels of demand and other noninterest-bearing deposits and other liabilities, partially offset by other assets.

17

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Provision for Credit Losses

The Corporation adopted ASU No. 2016-13, “Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments” (ASU 2016-13) on January 1, 2020, which significantly changed the way impairment of financial instruments is recognized by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of financial instruments. Upon adoption of ASU 2016-13, the Corporation recorded a $13.7 million increase in the allowance for credit losses with a corresponding cumulative effect adjustment to decrease retained earnings by $10.1 million, net of income taxes. For more information on the adoption of ASU 2016-13, please refer to Note 2 — Recent Accounting Pronouncements to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

The provision for credit losses for the nine months ended September 30, 2020 was $127.5 million primarily due to an increase in the reserve evaluated on a collective basis driven by downgrades in the portfolio and current and projected economic conditions, both resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with the largest increases in the commercial and institutional and commercial real estate portfolios. The provision for credit losses for the nine months ended September 30, 2019 was a credit provision of $13.5 million primarily driven by a decrease in the allowance for the residential real estate portfolio driven by reductions in outstanding loans and improved credit quality, partially offset by increases for the private client portfolio driven by lower credit quality, which resulted in a net decrease in the inherent allowance.

Net recoveries in the current-year period totaled $2.3 million resulting from $3.0 million of charge-offs and $5.3 million of recoveries, compared to net recoveries of $3.0 million in the prior-year period resulting from $2.7 million of charge-offs and $5.7 million of recoveries.

Residential real estate, commercial and institutional, and commercial real estate loans accounted for 65%, 31%, and 4%, respectively, of total nonaccrual loans and leases at September 30, 2020. Residential real estate, commercial and institutional, commercial real estate and non-U.S. loans accounted for 86%, 10%, 3%, and 1%, respectively, of total nonaccrual loans and leases at September 30, 2019. For additional discussion of the allowance for credit losses, refer to the “Asset Quality” section beginning on page 26.

Noninterest Expense

The components of noninterest expense are provided in the following table.

TABLE 21: NONINTEREST EXPENSE

	NINE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020		2019		CHANGE
Compensation	$	1,421.8	$	1,395.5	$	26.3	2	%
Employee Benefits	285.8		262.6		23.2		9
Outside Services	555.0		568.8		(13.8)		(2)
Equipment and Software	497.1		447.2		49.9		11
Occupancy	162.9		155.5		7.4		5
Other Operating Expense	274.6		241.6		33.0		14
Total Noninterest Expense	$	3,197.2	$	3,071.2	$	126.0	4	%

Compensation expense, the largest component of noninterest expense increased compared to the prior-year period, primarily reflecting higher salary expense, driven by staff growth and base pay adjustments, and a one-time supplemental payment to certain employees in response to the COVID-19 pandemic, partially offset by lower cash-based incentives and long-term performance-based incentive expense.

Employee benefits expense increased compared to the prior-year period, primarily reflecting higher retirement plan expenses.

Outside services expense decreased compared to the prior-year period, primarily reflecting lower data processing, consulting services and technical services costs.

Equipment and software expense increased compared to the prior-year period, primarily due to higher depreciation and amortization and software support costs.

Occupancy expense increased compared to the prior-year period, primarily reflecting higher rent and building depreciation associated with executing workplace real estate strategies, partially offset by a reduction of an asset retirement obligation resulting from a lease renegotiation.

18

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Expense (continued)

Other operating expense increased compared to the prior-year period, primarily due to a $43.4 million charge related to a corporate action processing error as well as increases in mutual fund co-administration fees, partially offset by decreased business promotion expense due to reduced business travel and lower staff-related expense.

The components of other operating expense are provided in the following table.

TABLE 22: OTHER OPERATING EXPENSE

	NINE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020		2019		CHANGE
Business Promotion	$	50.1	$	78.1	$	(28.0)	(36)	%
Staff Related	20.5		28.8		(8.3)		(29)
FDIC Insurance Premiums	8.6		7.6		1.0		12
Other Intangibles Amortization	12.6		12.5		0.1		1
Other Expenses	182.8		114.6		68.2		59
Total Other Operating Expense	$	274.6	$	241.6	$	33.0	14	%

Provision for Income Taxes

Income tax expense for the nine months ended September 30, 2020 was $285.8 million, representing an effective tax rate of 22.8%, compared to $346.6 million for the nine months ended September 30, 2019, representing an effective tax rate of 23.6%.

The provision for income taxes decreased primarily due to decreased income before income taxes, a change in the earnings mix in tax jurisdictions in which the Corporation operates, and additional benefits related to share-based compensation arrangements and tax-exempt income, partially offset by prior-year-period income tax benefits recorded as a result of the Corporation’s international organizational restructuring.

REPORTING SEGMENTS

Northern Trust is organized around its two client-focused reporting segments: C&IS and Wealth Management. Asset management and related services are provided to C&IS and Wealth Management clients primarily by the Asset Management business. The revenue and expenses of Asset Management and certain other support functions are allocated fully to C&IS and Wealth Management.

Reporting segment financial information, presented on an internal management-reporting basis, is determined by accounting systems used to allocate revenue and expense to each segment, and incorporates processes for allocating assets, liabilities, equity and the applicable interest income and expense utilizing a funds transfer pricing (FTP) methodology. Under the methodology, assets and liabilities receive a funding charge or credit that considers interest rate risk, liquidity risk, and other product characteristics on an instrument level.

Revenues, expenses and average assets are allocated to C&IS and Wealth Management, with the exception of non-recurring activities such as certain costs associated with acquisitions, divestitures, litigation, restructuring, and tax adjustments not directly attributable to a specific reporting segment.

Reporting segment results are subject to reclassification when organizational changes are made. The results are also subject to refinements in revenue and expense allocation methodologies, which are typically reflected on a prospective basis.

19

REPORTING SEGMENTS (continued)

The following table reflects the earnings contributions and average assets of Northern Trust’s reporting segments for the three- and nine- month periods ended September 30, 2020 and 2019.

TABLE 23: RESULTS OF REPORTING SEGMENTS

($ In Millions)	CORPORATE & INSTITUTIONAL SERVICES						WEALTH MANAGEMENT						TREASURY AND OTHER						TOTAL CONSOLIDATED
THREE MONTHS ENDED SEPTEMBER 30,	2020			2019			2020			2019			2020			2019			2020			2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$	584.9		$	559.9		$	418.9		$	415.6		$	—		$	—		$	1,003.8		$	975.5
Foreign Exchange Trading Income	58.4			55.5			3.2			4.2			—			—			61.6			59.7
Other Noninterest Income	56.7			53.6			39.7			38.1			(5.3)			(6.7)			91.1			85.0
Total Noninterest Income	700.0			669.0			461.8			457.9			(5.3)			(6.7)			1,156.5			1,120.2
Net Interest Income(1)	139.9			229.9			196.6			195.4			—			—			336.5			425.3
Revenue(1)	839.9			898.9			658.4			653.3			(5.3)			(6.7)			1,493.0			1,545.5
Provision for Credit Losses	(19.2)			4.8			19.7			(11.8)			—			—			0.5			(7.0)
Noninterest Expense	707.3			649.2			386.3			385.9			1.1			1.2			1,094.7			1,036.3
Income before Income Taxes(1)	151.8			244.9			252.4			279.2			(6.4)			(7.9)			397.8			516.2
Provision for Income Taxes(1)	38.7			59.9			66.2			73.6			(1.6)			(1.9)			103.3			131.6
Net Income	$	113.1		$	185.0		$	186.2		$	205.6		$	(4.8)		$	(6.0)		$	294.5		$	384.6
Percentage of Consolidated Net Income	39		%	48		%	63		%	54		%	(2)		%	(2)		%	100		%	100		%
Average Assets	$	108,823.0		$	85,982.2		$	32,102.4		$	30,369.9		$	—		$	—		$	140,925.4		$	116,352.1

⁽¹⁾Non-GAAP financial measures stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $7.9 million for 2020 and $7.6 million for 2019. A reconciliation of total consolidated revenue, net interest income and net interest margin on a GAAP basis to revenue, net interest income and net interest margin on an FTE basis (each of which is a non-GAAP financial measure) is provided on page 35.

($ In Millions)	CORPORATE & INSTITUTIONAL SERVICES						WEALTH MANAGEMENT						TREASURY AND OTHER						TOTAL CONSOLIDATED
NINE MONTHS ENDED SEPTEMBER 30,	2020			2019			2020			2019			2020			2019			2020			2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,725.5		$	1,644.5		$	1,243.4		$	1,215.4		$	—		$	—		$	2,968.9		$	2,859.9
Foreign Exchange Trading Income	211.8			172.5			10.0			13.9			—			—			221.8			186.4
Other Noninterest Income	167.5			141.8			122.9			95.1			(11.0)			(14.9)			279.4			222.0
Total Noninterest Income	2,104.8			1,958.8			1,376.3			1,324.4			(11.0)			(14.9)			3,470.1			3,268.3
Net Interest Income(1)	516.6			694.3			615.9			585.9			—			—			1,132.5			1,280.2
Revenue(1)	2,621.4			2,653.1			1,992.2			1,910.3			(11.0)			(14.9)			4,602.6			4,548.5
Provision for Credit Losses	35.3			1.3			92.2			(14.8)			—			—			127.5			(13.5)
Noninterest Expense	2,022.2			1,930.5			1,152.7			1,137.9			22.3			2.8			3,197.2			3,071.2
Income before Income Taxes(1)	563.9			721.3			747.3			787.2			(33.3)			(17.7)			1,277.9			1,490.8
Provision for Income Taxes(1)	129.9			171.8			187.9			202.3			(8.3)			(4.4)			309.5			369.7
Net Income	$	434.0		$	549.5		$	559.4		$	584.9		$	(25.0)		$	(13.3)		$	968.4		$	1,121.1
Percentage of Consolidated Net Income	45		%	49		%	58		%	52		%	(3)		%	(1)		%	100		%	100		%
Average Assets	$	102,902.3		$	87,664.1		$	31,742.9		$	29,700.6		$	—		$	—		$	134,645.2		$	117,364.7

⁽¹⁾Non-GAAP financial measures stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $23.7 million for 2020 and $23.1 million for 2019. A reconciliation of total consolidated revenue, net interest income and net interest margin on a GAAP basis to revenue, net interest income and net interest margin on an FTE basis (each of which is a non-GAAP financial measure) is provided on page 35.

Corporate & Institutional Services

C&IS Net Income

For the quarter ended September 30, 2020, net income decreased $71.9 million, or 39%, from the prior-year quarter, primarily reflecting lower net interest income and higher noninterest expense, partially offset by higher noninterest income, a decrease in the provision for credit losses, and a decrease in the provision for income taxes. For the nine months ended September 30, 2020, net income decreased $115.5 million, or 21%, from the prior-year period, primarily reflecting lower net interest income, higher noninterest expense, and an increase in the provision for credit losses, partially offset by higher noninterest income and a lower provision for income taxes.

20

REPORTING SEGMENTS (continued)

Corporate & Institutional Services (continued)

C&IS Noninterest Income

For the quarter ended September 30, 2020, noninterest income increased $31.0 million, or 5%, from the prior-year quarter, primarily reflecting higher trust, investment and other servicing fees. For the nine months ended September 30, 2020, noninterest income increased $146.0 million, or 7%, from the prior-year period, primarily reflecting higher trust, investment and other servicing fees, foreign exchange trading income, and other noninterest income.

C&IS Trust, Investment and Other Servicing Fees

For an explanation of C&IS trust, investment, and other servicing fees, please see the “Trust, Investment and Other Servicing Fees” sections of the MD&A.

C&IS Foreign Exchange Trading Income

For the nine months ended September 30, 2020, foreign exchange trading income increased $39.3 million, or 23%, from the prior-year period, primarily due to increased market volatility.

C&IS Other Noninterest Income

For the nine months ended September 30, 2020, other noninterest income increased $25.7 million, or 18%, from the prior-year period, primarily due to security commissions and trading income.

C&IS Net Interest Income

For the quarter ended September 30, 2020, net interest income stated on an FTE basis decreased $90.0 million, or 39%, from the prior-year quarter and decreased $177.7 million, or 26%, from the prior-year period for the nine months ended September 30, 2020. The decrease for the three and nine months ended September 30, 2020 primarily reflected a lower net interest margin driven by declining short-term interest rates, partially offset by higher deposit balances and loan volumes. Average earning assets increased $22.8 billion to $99.7 billion in the current quarter from $76.9 billion in the prior-year quarter and increased $13.3 billion to $92.5 billion in the nine-month period ended September 30, 2020 from $79.2 billion in the prior-year period. The earning assets and funding sources in C&IS for the three and nine months ended September 30, 2020 consisted primarily of intercompany assets and of loans and non-U.S. custody-related interest-bearing deposits, respectively.

C&IS Provision for Credit Losses

On January 1, 2020, the Corporation adopted ASU 2016-13. For more information on the adoption, please refer to Note 2 — Recent Accounting Pronouncements to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited). The C&IS provision for credit losses for the three and nine months ended September 30, 2020, was a credit provision of $19.2 million and a provision of $35.3 million, respectively, compared with a provision under the previous “incurred loss” model of $4.8 million and $1.3 million for the three and nine months ended September 30, 2019, respectively.

The credit provision for the three months ended September 30, 2020 reflected a decrease in the reserve evaluated on a collective basis driven by less severe projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts specifically impacting the commercial and institutional portfolio, with the largest decrease in the commercial and institutional portfolio. The provision for the nine months ended September 30, 2020 reflected an increase in the reserve evaluated on a collective basis driven by downgrades in the portfolio and projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts on the commercial and institutional portfolio.

C&IS Noninterest Expense

For the quarter ended September 30, 2020, noninterest expense, which includes the direct expense of the reporting segment, indirect expense allocations for product and operating support and indirect expense allocations for certain corporate support services, increased $58.1 million, or 9%, from the prior-year quarter, primarily due to higher expense allocations, including a $43.4 million charge related to a corporate action processing error, higher compensation expense, outside services expense, employee benefits expense and equipment and software expense, partially offset by lower business promotion expense due to reduced business travel.

For the nine months ended September 30, 2020, noninterest expense increased $91.7 million, or 5%, from the prior-year period, primarily reflecting higher expense allocations, including higher charges related to account servicing activities in the current period, compensation expense, employee benefit expense, and equipment and software expense, partially offset by lower business promotion expense due to reduced business travel and lower staff-related expenses.

21

REPORTING SEGMENTS (continued)

Wealth Management

Wealth Management Net Income

For the quarter ended September 30, 2020, net income decreased $19.4 million, or 9%, from the prior-year quarter primarily due to an increase in the provision for credit losses, partially offset by a lower provision for income taxes and higher noninterest income. For the nine months ended September 30, 2020, net income decreased $25.5 million, or 4%, from the prior-year period primarily due to an increase in the provision for credit losses and higher noninterest expense, partially offset by higher net interest income, noninterest income, and a lower provision for income taxes.

Wealth Management Noninterest Income

For the quarter ended September 30, 2020, noninterest income increased $3.9 million from the prior-year quarter, primarily reflecting higher trust, investment and other servicing fees. For the nine months ended September 30, 2020, noninterest income increased $51.9 million, or 4%, from the prior-year period primarily reflecting higher trust, investment and other servicing fees and other noninterest income.

Wealth Management Trust, Investment and Other Servicing Fees

For an explanation of Wealth Management trust, investment, and other servicing fees, please see the “Trust, Investment and Other Servicing Fees” sections of the MD&A.

Wealth Management Other Noninterest Income

For the nine months ended September 30, 2020, other noninterest income increased $27.8 million, or 29%, from the prior-year period, primarily due to an increase in security commissions and trading income.

Wealth Management Net Interest Income

For the quarter ended September 30, 2020, net interest income stated on an FTE basis increased $1.2 million, or 1%, from the prior-year quarter and increased $30.0 million, or 5%, from the prior-year period for the nine months ended September 30, 2020. The increase for the three and nine months ended September 30, 2020 primarily reflected higher net interest allocation from Treasury and Other and higher deposit and loan balances, partially offset by lower interest rates. Average earning assets increased $1.6 billion to $29.7 billion in the current quarter from $28.1 billion in the prior-year quarter and increased $1.5 billion to $29.3 billion in the nine-month period ended September 30, 2020 from $27.8 billion in the prior-year period. Earning assets and funding sources for the three and nine months ended September 30, 2020 were primarily comprised of loans and domestic interest-bearing deposits, respectively.

Wealth Management Provision for Credit Losses

On January 1, 2020, the Corporation adopted ASU 2016-13. For more information on the adoption, please refer to Note 2 — Recent Accounting Pronouncements to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited). The Wealth Management provision for credit losses was $19.7 million and $92.2 million for the three and nine months ended September 30, 2020, respectively, and a credit provision under the previous “incurred loss” model of $11.8 million and $14.8 million for the three and nine months ended September 30, 2019, respectively.

The provision for the three months ended September 30, 2020 reflected an increase in the reserve evaluated on a collective basis driven by projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts, primarily impacting the private client and commercial real estate portfolios. The provision for the nine months ended September 30, 2020 reflected an increase in the reserve evaluated on a collective basis driven by downgrades in the portfolio and projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts, primarily impacting the commercial real estate, commercial and institutional, and private client portfolios.

Wealth Management Noninterest Expense

For the quarter ended September 30, 2020, noninterest expense, which includes the direct expense of the reporting segment, indirect expense allocations for product and operating support and indirect expense allocations for certain corporate support services, remained relatively unchanged from the prior-year quarter, primarily reflecting higher expense allocations and employee benefit expense partially offset by lower compensation expense and lower business promotion expense due to reduced business travel.

For the nine months ended September 30, 2020, noninterest expense increased $14.8 million from the prior-year quarter, primarily reflecting higher expense allocations and employee benefits, partially offset by lower business promotion expense due to reduced business travel, as well as various other operating expenses and lower compensation expense.

22

REPORTING SEGMENTS (continued)

Treasury and Other

Treasury and Other Noninterest Income

For the nine months ended September 30, 2020, noninterest income increased $3.9 million from the prior-year period. Noninterest income increased for the nine months ended September 30, 2020 due to lower expenses for existing swap agreements related to Visa Inc. Class B common shares.

Treasury and Other Noninterest Expense

For the nine months ended September 30, 2020, noninterest expense increased $19.5 million from the prior-year period, primarily due to costs associated with executing workplace real estate strategies and higher compensation expense related to a one-time supplemental payment to employees in response to the COVID-19 pandemic.

23

CONSOLIDATED BALANCE SHEETS

The following tables summarize selected consolidated balance sheet information.

TABLE 24: SELECT CONSOLIDATED BALANCE SHEET INFORMATION

($ In Billions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019		CHANGE
Assets
Federal Reserve and Other Central Bank Deposits and Other(1)	$	39.2	$	33.8	$	5.4	16	%
Interest-Bearing Due from and Deposits with Banks(2)	4.9		7.0		(2.1)		(31)
Federal Funds Sold and Securities Purchased under Agreements to Resell	1.5		0.7		0.8		115
Total Securities(3)	60.6		52.3		8.3		16
Loans and Leases	32.8		31.4		1.4		4
Total Earning Assets	139.0		125.2		13.8		11
Total Assets	152.1		136.8		15.3		11
Liabilities and Stockholders' Equity
Total Interest-Bearing Deposits	88.2		82.8		5.4		6
Demand and Other Noninterest-Bearing Deposits	34.4		26.3		8.1		31
Short-Term Borrowings	8.2		7.8		0.4		6
Total Stockholders’ Equity	11.6		11.1		0.5		4

⁽¹⁾    Federal Reserve and Other Central Bank Deposits and Other includes collateral deposits with certain securities depositories and clearing houses for the purpose of presenting earning assets; such deposits are presented in Other Assets on the consolidated balance sheets.

⁽²⁾    Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

⁽³⁾    Total Securities includes certain community development investments and Federal Home Loan Bank and Federal Reserve stock, which are classified in Other Assets on the consolidated balance sheets.

TABLE 25: SELECT AVERAGE CONSOLIDATED BALANCE SHEET INFORMATION

	THREE MONTHS ENDED SEPTEMBER 30,								NINE MONTHS ENDED SEPTEMBER 30,
($ In Billions)	2020		2019		CHANGE				2020		2019		CHANGE
Assets
Federal Reserve and Other Central Bank Deposits and Other(1)	$	31.6	$	17.5	$	14.1	80	%	$	27.3	$	19.0	$	8.3	44	%
Interest-Bearing Due from and Deposits with Banks(2)	4.8		5.7		(0.9)		(15)		5.4		6.0		(0.6)		(10)
Federal Funds Sold and Securities Purchased under Agreements to Resell	1.8		0.8		1.0		119		1.1		0.8		0.3		41
Total Securities(3)	58.1		50.0		8.1		16		54.3		50.2		4.1		8
Loans and Leases	33.1		30.9		2.2		7		33.6		31.1		2.5		8
Total Earning Assets	129.4		104.9		24.5		23		121.7		107.1		14.6		14
Total Assets	140.9		116.4		24.5		21		134.6		117.4		17.2		15
Liabilities and Stockholders' Equity
Total Interest-Bearing Deposits	87.6		72.3		15.3		21		84.1		72.5		11.6		16
Demand and Other Noninterest-Bearing Deposits	25.2		16.7		8.5		51		22.1		17.5		4.6		27
Short-Term Borrowings	6.6		8.8		(2.2)		(24)		7.9		9.6		(1.7)		(17)
Total Stockholders’ Equity	11.4		10.7		0.7		7		11.1		10.6		0.5		5

⁽¹⁾    Federal Reserve and Other Central Bank Deposits and Other includes collateral deposits with certain securities depositories and clearing houses for the purpose of presenting earning assets; such deposits are presented in Other Assets on the consolidated balance sheets.

⁽²⁾    Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

⁽³⁾    Total Securities includes certain community development investments and Federal Home Loan Bank and Federal Reserve stock, which are classified in Other Assets on the consolidated balance sheets.

Average balances are considered to be a better measure of balance sheet trends, as period-end balances can be impacted by the timing of deposit and withdrawal activity involving large client balances. The current quarter growth in both the period-end and average consolidated balance sheets was primarily driven by higher customer deposit balances.

Stockholders’ Equity. The increase in average stockholders’ equity was primarily attributable to earnings and accumulated other comprehensive income since the prior-year period, partially offset by the repurchase of common stock pursuant to the Corporation’s share repurchase program and dividend declarations.

24

CONSOLIDATED BALANCE SHEETS (continued)

During the three and nine months ended September 30, 2020, the Corporation declared cash dividends totaling $148.4 million and $445.2 million to common stockholders, and cash dividends totaling $16.2 million and $40.0 million to preferred stockholders, respectively.

As the Corporation suspended its open-market share repurchase program on March 16, 2020, the only shares repurchased during the three months ended September 30, 2020 were 18,534 shares of common stock withheld upon the vesting of share-based compensation at a total cost of $1.5 million ($81.02 average price per share) to satisfy tax withholding obligations. During the nine months ended September 30, 2020, the Corporation repurchased 3,262,621 shares of common stock, including 518,745 shares withheld related to share-based compensation, at a total cost of $298.5 million ($91.49 average price per share).

During the second quarter of 2020, the Federal Reserve announced certain measures to ensure that large financial institutions, including Northern Trust, remain resilient despite the economic uncertainty resulting from the ongoing COVID-19 pandemic. Specifically, for the third quarter of 2020, no share repurchases were permitted by these institutions and dividend payments were limited to the amount paid in the second quarter and could not exceed the payor’s average net income for the four preceding quarters. On September 30, 2020, the Federal Reserve announced that these measures have been extended to apply to the fourth quarter of 2020 as well.

25

ASSET QUALITY

Securities Portfolio

Northern Trust maintains a high quality debt securities portfolio. Debt securities not explicitly rated were grouped where possible under the credit rating of the issuer of the security.

The following tables provide the fair value of debt securities available for sale and amortized cost of debt securities held to maturity by credit rating.

TABLE 26: FAIR VALUE OF DEBT SECURITIES AVAILABLE FOR SALE BY CREDIT RATING

	AS OF SEPTEMBER 30, 2020
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	4,165.2		$	—		$	—		$	—		$	—		$	4,165.2
Obligations of States and Political Subdivisions	664.9			1,933.0			—			—			2.6			2,600.5
Government Sponsored Agency	24,568.8			—			—			—			—			24,568.8
Non-U.S. Government	893.7			38.5			5.4			—			—			937.6
Corporate Debt	575.4			719.8			1,161.1			25.1			146.0			2,627.4
Covered Bonds	424.5			—			23.0			—			69.3			516.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	1,768.8			625.8			158.2			—			—			2,552.8
Other Asset-Backed	3,464.4			—			—			—			95.0			3,559.4
Commercial Mortgage-Backed	1,015.2			—			—			—			—			1,015.2
Other	7.3			—			—			—			—			7.3
Total	$	37,548.2		$	3,317.1		$	1,347.7		$	25.1		$	312.9		$	42,551.0
Percent of Total	88		%	8		%	3		%	—		%	1		%	100		%

The 1% of debt securities available for sale not rated by Moody’s Investors Service, Standard and Poor’s or Fitch Ratings primarily consisted of corporate debt and covered bonds.

TABLE 27: AMORTIZED COST OF DEBT SECURITIES HELD TO MATURITY BY CREDIT RATING

	AS OF SEPTEMBER 30, 2020
($ In Millions)	AAA			AA			A			BBB			NOT RATED			TOTAL
U.S. Government	$	99.0		$	—		$	—		$	—		$	—		$	99.0
Obligations of States and Political Subdivisions	—			0.6			0.7			1.3			—			2.6
Government Sponsored Agency	3.4			—			—			—			—			3.4
Non-U.S. Government	335.6			1,269.7			5,899.8			46.7			—			7,551.8
Corporate Debt	3.6			254.7			272.0			—			—			530.3
Covered Bonds	3,361.7			—			—			—			—			3,361.7
Certificates of Deposit	—			—			—			—			726.3			726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,423.6			966.9			—			—			—			3,390.5
Other Asset-Backed	645.8			—			—			—			—			645.8
Other	—			—			—			—			442.6			442.6
Total	$	6,872.7		$	2,491.9		$	6,172.5		$	48.0		$	1,168.9		$	16,754.0
Percent of Total	41		%	15		%	37		%	—		%	7		%	100		%

The 7% of debt securities held to maturity not rated by Moody’s Investors Service, Standard and Poor’s or Fitch Ratings consisted of certificates of deposit with a remaining life of less than six months as well as investments purchased by Northern Trust to fulfill its obligations under the Community Reinvestment Act (CRA). Northern Trust fulfills its obligations under the CRA by making qualified investments for purposes of supporting institutions and programs that benefit low-to-moderate income communities within Northern Trust’s market area.

Net unrealized gains within the investment securities portfolio totaled $884.3 million at September 30, 2020, compared to net unrealized gains of $118.9 million as of December 31, 2019. Net unrealized gains as of September 30, 2020 were comprised of $1.0 billion and $125.4 million of gross unrealized gains and losses, respectively.

As of September 30, 2020, the $42.6 billion debt securities available for sale portfolio had unrealized losses of $21.2 million and $9.5 million related to government-sponsored agency and other asset-backed securities, respectively, which are primarily attributable to changes in market interest rates and credit spreads since their purchase.

As of September 30, 2020, the $16.8 billion debt securities held to maturity portfolio had an unrealized loss of $88.7 million related to other residential mortgage-backed securities, which is primarily attributable to changes in overall market interest rates and credit spreads since their purchase.

26

ASSET QUALITY (continued)

Securities Portfolio (continued)

As of September 30, 2020, 21% of the corporate debt securities available for sale portfolio was backed by guarantees provided by U.S. and non-U.S. government entities.

For additional information relating to the securities portfolio, refer to Note 4 — Securities to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

Northern Trust participates in the repurchase agreement market as a relatively low cost alternative for short-term funding. Securities purchased under agreements to resell and securities sold under agreements to repurchase are accounted for as collateralized financings and recorded at the amounts at which the securities were acquired or sold plus accrued interest. To minimize potential credit risk associated with these transactions, the fair value of the securities purchased or sold is monitored, limits are set on exposure with counterparties, and the financial condition of counterparties is regularly assessed. It is Northern Trust’s policy to take possession, either directly or via third-party custodians, of securities purchased under agreements to resell. Securities sold under agreements to repurchase are held by the counterparty until their repurchase.

For additional information relating to the securities sold under agreements to repurchase, refer to Note 5 — Securities Sold Under Agreements to Repurchase to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

Nonaccrual Loans and Leases and Other Real Estate Owned

During the first quarter of 2020, the Corporation implemented a change in the classification of certain loans and leases to enhance the consistency of its reporting across various regulatory regimes. As a result, the loan and lease balances as of December 31, 2019 below have been adjusted to conform to the presentation for periods ended after such date. The adjustments generally reflect reclassification of loans from the commercial real estate class to commercial and institutional, residential real estate, and private client classes. There was no impact on total loans and leases previously reported.

Nonaccrual assets consist of nonaccrual loans and leases and other real estate owned (OREO). OREO is comprised of commercial and residential properties acquired in partial or total satisfaction of loans.

The following table provides the amounts of nonaccrual loans and leases, by loan and lease segment and class, and of OREO that were outstanding at the dates shown, as well as the balance of loans that was delinquent 90 days or more and still accruing interest. Loans that are delinquent 90 days or more and still accruing interest can fluctuate widely based on the timing of cash collections, renegotiations and renewals.

TABLE 28: NONACCRUAL ASSETS

($ In Millions)	SEPTEMBER 30, 2020			DECEMBER 31, 2019
Nonaccrual Loans and Leases
Commercial
Commercial and Institutional	$	30.2		$	7.6
Commercial Real Estate	3.9			3.6
Non-U.S.	—			—
Total Commercial	34.1			11.2
Personal
Residential Real Estate	$	63.9		$	71.4
Private Client	—			0.5
Non-U.S.	—			0.5
Total Personal	63.9			72.4
Total Nonaccrual Loans and Leases	98.0			83.6
Other Real Estate Owned	0.9			3.2
Total Nonaccrual Assets	$	98.9		$	86.8
90 Day Past Due Loans Still Accruing	$	8.6		$	7.4
Nonaccrual Loans and Leases to Total Loans and Leases	0.30		%	0.27		%
Coverage of Loan and Lease Allowance to Nonaccrual Loans and Leases	2.2x			1.3x

Nonaccrual assets of $98.9 million as of September 30, 2020 increased primarily related to a net increase in the commercial and institutional portfolio primarily due to four new nonaccrual loans, partially offset by a decrease in the residential real estate portfolio due to net payoffs and charge-offs. In addition to the negative impact on net interest income and the risk of credit losses, nonaccrual assets also increase operating costs due to the expense associated with collection efforts. Changes in the level of nonaccrual assets may be indicative of changes in the credit quality of one or more loan classes. Changes in credit quality impact the allowance for credit losses through the resultant adjustment of the allowance evaluated on an individual level and the

27

ASSET QUALITY (continued)

Nonaccrual Loans and Leases and Other Real Estate Owned (continued)

quantitative and qualitative factors used in the determination of the allowance evaluated on a collective level within the allowance for credit losses.

Northern Trust’s credit policies do not allow for the origination of loan types generally considered to be high risk in nature, such as option adjustable rate mortgage loans, subprime loans, loans with initial “teaser” rates and loans with excessively high loan-to-value ratios. Residential real estate loans consist of first lien mortgages and equity credit lines, which generally require a loan-to-collateral value of no more than 65% to 80% at inception. Appraisals of supporting collateral for residential real estate loans are obtained at loan origination and upon refinancing or default or when otherwise considered warranted. Residential real estate collateral appraisals are performed and reviewed by independent third parties.

The commercial real estate portfolio consists of commercial mortgages and construction, acquisition and development loans extended primarily to experienced investors well known to Northern Trust. Underwriting standards generally reflect conservative loan-to-value ratios and debt service coverage requirements. Recourse to owners through guarantees also is commonly required.

For additional information relating to the loans and leases portfolio, refer to Note 6 — Loans and Leases to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

Allowance for Credit Losses

During the first quarter of 2020, the Corporation implemented a change in the classification of certain loans and leases to specific segments to enhance the consistency of its reporting across various regulatory regimes. The allowance for credit losses as of and prior to December 31, 2019 remains unadjusted, as the impact of the reclassification on the allowance was immaterial.

The Corporation adopted ASU No. 2016-13, “Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments” (ASU 2016-13) on January 1, 2020, which significantly changed the way impairment of financial instruments is recognized by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of financial instruments. Upon adoption of ASU 2016-13, the Corporation recorded a $13.7 million increase in the allowance for credit losses with a corresponding cumulative effect adjustment to decrease retained earnings by $10.1 million, net of income taxes. For more information on the adoption of ASU 2016-13, please refer to Note 2 — Recent Accounting Pronouncements to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

The allowance for credit losses — which represents management’s estimate of lifetime expected credit losses related to various portfolios subject to credit risk, off-balance-sheet credit exposure, and specific borrower relationships — is determined by management through a disciplined credit review process. Northern Trust measures expected credit losses of financial assets with similar risk characteristics on a collective basis. A financial asset is measured individually if it does not share similar risk characteristics with other financial assets and the related allowance is determined through an individual evaluation.

Management’s estimates utilized in establishing an appropriate level of allowance for credit losses are not dependent on any single assumption. In determining an appropriate allowance level, management evaluates numerous variables, many of which are interrelated or dependent on other assumptions and estimates, and takes into consideration past events, current conditions and reasonable and supportable forecasts.

The results of the credit reserve estimation methodology are reviewed quarterly by Northern Trust’s Credit Loss Reserve Committee, which receives input from Credit Risk Management, Treasury, Corporate Finance, the Economic Research group, and each of Northern Trust’s business units.

The allowance for credit losses related to loans and leases, undrawn loan commitments and standby letters of credit, debt securities held to maturity, and other financial assets, was $215.4 million, $44.9 million, $6.9 million, and $0.7 million, respectively as of September 30, 2020. For additional information relating to the allowance for credit losses and the changes in the allowance for credit losses during the three and nine months ended September 30, 2020 and 2019 due to charge-offs, recoveries and provisions for credit losses, refer to Note 7 — Allowance for Credit Losses to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited). The following table shows the allowance evaluated on an individual and collective level for the loans and leases portfolio by segment and class.

28

ASSET QUALITY (continued)

Allowance for Credit Losses (continued)

TABLE 29: ALLOCATION OF THE ALLOWANCE FOR CREDIT LOSSES FOR LOANS AND LEASES

	SEPTEMBER 30, 2020					DECEMBER 31, 2019
($ In Millions)	ALLOWANCE AMOUNT			PERCENT OF LOANS TO TOTAL LOANS		ALLOWANCE AMOUNT			PERCENT OF LOANS TO TOTAL LOANS
Evaluated on an Individual Level	$	8.2		—	%	$	6.9		—	%
Evaluated on a Collective Level
Commercial
Commercial and Institutional	82.0			29		35.3			29
Commercial Real Estate	77.9			10		33.0			10
Lease Financing, net	0.3			—		0.1			—
Non-U.S.	19.6			5		—			5
Other	0.1			1		0.2			1
Total Commercial	179.9			45		68.6			45
Personal
Residential Real Estate	39.4			18		27.0			19
Private Client	31.4			36		20.5			35
Non-U.S.	1.4			1		—			1
Other	—			—		1.4			—
Total Personal	72.2			55		48.9			55
Total Allowance Evaluated on a Collective Level	$	252.1		100	%	$	117.5		100	%
Total Allowance for Credit Losses	$	260.3		100	%	$	124.4		100	%
Allowance Assigned to
Loans and Leases	$	215.4				$	104.5
Undrawn Commitments and Standby Letters of Credit	44.9					19.9
Total Allowance for Credit Losses	$	260.3				$	124.4
Allowance Assigned to Loans and Leases to Total Loans and Leases	0.66		%			0.33		%

29

STATEMENTS OF CASH FLOWS

The following discusses the statement of cash flow activities for the nine months ended September 30, 2020 and 2019.

TABLE 30: CASH FLOW ACTIVITY SUMMARY

	NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019
Net cash provided by (used in):
Operating activities	$	420.5	$	955.6
Investing activities	(13,114.5)		8,998.4
Financing activities	13,032.3		(9,498.9)
Effect of Foreign Currency Exchange Rates on Cash	(60.0)		0.9
Change in Cash and Due from Banks	$	278.3	$	456.0

Operating Activities

Net cash provided by operating activities of $420.5 million for the nine months ended September 30, 2020 was primarily attributable to period earnings and the impact of higher non-cash charges such as amortization of computer software and the provision for credit losses, partially offset by higher net collateral deposited with derivative counterparties and net changes in other operating activities.

For the nine months ended September 30, 2019, net cash provided by operating activities of $955.6 million was primarily attributable to period earnings and the impact of non-cash charges such as amortization of computer software, partially offset by an increase in accounts receivable and net changes in other operating activities.

Investing Activities

Net cash used in investing activities of $13.1 billion for the nine months ended September 30, 2020 was primarily attributable to increased levels of Federal Reserve and other central bank deposits as well as net purchases of debt securities held to maturity and available for sale, partially offset by lower levels of interest-bearing deposits with banks.

For the nine months ended September 30, 2019, net cash provided by investing activities of $9.0 billion was primarily attributable to decreased levels of Federal Reserve and other central bank deposits, and net proceeds associated with debt securities held to maturity.

Financing Activities

Net cash provided by financing activities of $13.0 billion for the nine months ended September 30, 2020 was primarily attributable to the increased levels of total deposits. The increase in total deposits was primarily attributable to higher levels of non-U.S. offices noninterest-bearing client deposits, savings, money market and other interest-bearing deposits, and domestic noninterest-bearing deposits.

For the nine months ended September 30, 2019, net cash used in financing activities of $9.5 billion was primarily attributable to decreased levels of total deposits and federal funds purchased. The decrease in total deposits was primarily attributable to lower levels of non-U.S. offices interest-bearing client deposits and domestic noninterest-bearing deposits, partially offset by higher savings, money market and other interest-bearing deposits.

30

CAPITAL RATIOS

The capital ratios of Northern Trust Corporation and its principal subsidiary, The Northern Trust Company, remained strong at September 30, 2020, exceeding the requirements for classification as “well-capitalized” under applicable U.S. regulatory requirements.

As a result of the stress test results published by the Federal Reserve on June 25, 2020, Northern Trust’s stress capital buffer requirement for the 2020 Capital Plan cycle was set at 2.5%. The 2020 stress capital buffer became effective October 1, 2020, and results in a common equity tier 1 capital ratio minimum requirement of 7.0%.

The table below provides capital ratios, as well as the required minimum capital ratios, for Northern Trust Corporation and The Northern Trust Company determined by Basel III phased-in requirements.

TABLE 31: REGULATORY CAPITAL RATIOS

Capital Ratios — Northern Trust Corporation	SEPTEMBER 30, 2020				JUNE 30, 2020				SEPTEMBER 30, 2019
	STANDARDIZED APPROACH		ADVANCED APPROACH		STANDARDIZED APPROACH		ADVANCED APPROACH		STANDARDIZED APPROACH		ADVANCED APPROACH		WELL-CAPITALIZED RATIOS	MINIMUM CAPITAL RATIOS
Common Equity Tier 1 Capital	13.4	%	13.9	%	13.4	%	13.9	%	12.9	%	13.6	%	N/A	4.5	%
Tier 1 Capital	14.5		15.1		14.6		15.2		14.1		14.9		6.0	6.0
Total Capital	16.5		16.7		16.5		16.8		16.0		16.6		10.0	8.0
Tier 1 Leverage	7.7		7.7		7.6		7.6		8.6		8.6		N/A	4.0
Supplementary Leverage(1)	N/A		8.8		N/A		9.0		N/A		7.6		N/A	3.0

Capital Ratios — The Northern Trust Company	SEPTEMBER 30, 2020				JUNE 30, 2020				SEPTEMBER 30, 2019
	STANDARDIZED APPROACH		ADVANCED APPROACH		STANDARDIZED APPROACH		ADVANCED APPROACH		STANDARDIZED APPROACH		ADVANCED APPROACH		WELL-CAPITALIZED RATIOS		MINIMUM CAPITAL RATIOS
Common Equity Tier 1 Capital	13.8	%	14.6	%	13.9	%	14.7	%	13.2	%	14.3	%	6.5	%	4.5	%
Tier 1 Capital	13.8		14.6		13.9		14.7		13.2		14.3		8.0		6.0
Total Capital	15.6		16.0		15.7		16.2		14.9		15.8		10.0		8.0
Tier 1 Leverage	7.2		7.2		7.3		7.3		7.9		7.9		5.0		4.0
Supplementary Leverage(1)	N/A		8.1		N/A		8.2		N/A		7.0		3.0		3.0

⁽¹⁾ In November 2019, the Federal Reserve and other U.S. federal banking agencies adopted a final rule that established a deduction for central bank deposits from the total leverage exposures of custodial banking organizations, including Northern Trust Corporation and The Northern Trust Company, equal to the lesser of (i) the total amount of funds the custodial banking organization and its consolidated subsidiaries have on deposit at qualifying central banks and (ii) the total amount of client funds on deposit at the custodial banking organization that are linked to fiduciary or custodial and safekeeping accounts. The rule became effective on April 1, 2020.

Further, on April 1, 2020, the Federal Reserve issued an interim final rule that requires bank holding companies, including Northern Trust Corporation, to deduct, on a temporary basis, deposits with the Federal Reserve and investments in U.S. Treasury securities from their total leverage exposure. The U.S. Treasury securities deduction is applied in addition to the central bank deposits relief referred to above. This rule became effective on April 1, 2020 and will remain in effect through the first quarter of 2021. On May 15, 2020, the U.S. federal banking agencies released an interim final rule that permits insured depository institutions of bank holding companies also to temporarily exclude deposits with the Federal Reserve and investments in U.S. Treasury securities from their total leverage exposure. The Northern Trust Company did not elect to take this deduction.

The supplementary leverage ratios at September 30, 2020 and June 30, 2020 for the Northern Trust Corporation and The Northern Trust Company reflect the impact of these final rules.

31

CRITICAL ACCOUNTING ESTIMATES

For a description of Northern Trust’s significant accounting policies, refer to Note 1 — Summary of Significant Accounting Policies included under Item 8. Financial Statements and Supplementary Data in the Annual Report on Form 10-K for the year ended December 31, 2019. The use of estimates and assumptions is required in the preparation of financial statements in conformity with GAAP and actual results could differ from those estimates. The U.S. Securities and Exchange Commission (SEC) has issued guidance relating to the disclosure of critical accounting estimates. Critical accounting estimates are those that require management to make subjective or complex judgments about the effect of matters that are inherently uncertain and may change in subsequent periods. Changes that may be required in the underlying assumptions or estimates in these areas could have a material impact on Northern Trust’s future financial condition and results of operations.

For Northern Trust, accounting estimates that are viewed as critical are those relating to the allowance for credit losses and pension plan accounting. Management has discussed the development and selection of each critical accounting estimate with the Audit Committee of the Board of Directors. For a description of Northern Trust’s estimate related to pension plan accounting, refer to the Critical Accounting Estimates section in the Annual Report on Form 10-K for the year ended December 31, 2019. For a description of Northern Trust’s estimate related to the allowance for credit losses, refer to the Critical Accounting Estimates section in the Form 10-Q for the quarter ended March 31, 2020. For more information on the adoption of ASU 2016-13, please refer to Note 2 — Recent Accounting Pronouncements and Note 7 — Allowance for Credit Losses to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

RECENT ACCOUNTING PRONOUNCEMENTS AND DEVELOPMENTS

In January 2020, the Financial Accounting Standards Board (FASB) issued ASU No. 2020-01, “Investments—Equity Securities (Topic 321), Investments—Equity Method and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815): Clarifying the Interactions between Topic 321, Topic 323, and Topic 815” (ASU 2020-01). ASU 2020-01 addresses two accounting issues: (1) application of the measurement alternative under Topic 321 in correlation with the transition into and out of the equity method under Topic 323 and (2) the measurement of certain forward contracts and purchased options to acquire equity securities. ASU 2020-01 clarifies that an entity applying the measurement alternative under Topic 321 that must transition to the equity method under Topic 323 because of an observable transaction will remeasure its investment immediately before transition, whereas an entity applying the equity method under Topic 323 that must transition to Topic 321 because of an observable transaction will remeasure its investment immediately after transition. ASU 2020-01 also clarifies that certain forward contracts or purchased call options to acquire equity securities generally will be measured using the fair value principles of Topic 321 before settlement or exercise. ASU 2020-01 is effective for interim and annual periods beginning after December 15, 2020, although early adoption is permitted. ASU 2020-01 is not expected to have a significant impact on Northern Trust’s consolidated financial condition or results of operations.

In August 2020, the FASB issued ASU No. 2020-06, “Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity” (ASU 2020-06). ASU 2020-06 simplifies the convertible instrument accounting framework through the elimination of the beneficial conversion and cash conversion accounting models used to account for convertible debt and convertible preferred stock. ASU 2020-06 also amends the accounting for certain contracts in an entity’s own equity that are currently accounted for as derivatives because of specific settlement provisions in Accounting Standards Codification 815—Derivatives and Hedging. In addition, ASU 2020-06 modifies how particular convertible instruments and certain contracts that may be settled in cash or shares impact the diluted earnings per share computation. ASU 2020-06 is effective for interim and annual periods beginning after December 15, 2021, although early adoption is permitted. ASU 2020-06 is not expected to have a significant impact on Northern Trust’s consolidated financial condition or results of operations.

MARKET RISK MANAGEMENT

There are two types of market risk, interest rate risk and trading risk. Interest rate risk is the potential for movements in interest rates to cause changes in net interest income and the market value of equity. Trading risk is the potential for movements in market variables such as foreign exchange and interest rates to cause changes in the value of trading positions.

Northern Trust uses two primary measurement techniques to manage interest rate risk: Net Interest Income (NII) sensitivity and Market Value of Equity (MVE) sensitivity. NII sensitivity provides management with a short-term view of the impact of interest rate changes on NII. MVE sensitivity provides management with a long-term view of interest rate changes on MVE based on the period-end balance sheet.

As part of its risk management activities, Northern Trust also measures daily the risk of loss associated with all non-U.S. currency positions using a Value-at-Risk (VaR) model and applying the historical simulation methodology. The following

32

MARKET RISK MANAGEMENT (continued)

information about Northern Trust’s management of market risk should be read in conjunction with the Annual Report on Form 10-K for the year ended December 31, 2019.

NII Sensitivity — The modeling of NII sensitivity incorporates on-balance-sheet positions, as well as derivative financial instruments (principally interest rate swaps) that are used to manage interest rate risk. Northern Trust uses market implied forward interest rates as the base case and measures the sensitivity (i.e., change) of a static balance sheet to changes in interest rates. Stress testing of interest rates is performed to include such scenarios as immediate parallel shocks to rates, nonparallel (i.e., twist) changes to yield curves that result in their becoming steeper or flatter, and changes to the relationship among the yield curves (i.e., basis risk).

The NII sensitivity analysis incorporates certain critical assumptions such as interest rates and client behaviors under changing rate environments. These assumptions are based on a combination of historical analysis and future expected pricing behavior. The simulation cannot precisely estimate NII sensitivity given uncertainty in the assumptions. The following key assumptions are incorporated into the simulation:

▪the balance sheet size and mix remains constant over the simulation horizon with maturing assets and liabilities replaced with instruments with similar terms as those that are maturing, with the exception of certain nonmaturity deposits that are considered short-term in nature and therefore receive a more conservative interest-bearing treatment;

▪prepayments on mortgage loans and securities collateralized by mortgages are projected under each rate scenario using a third-party mortgage analytics system that incorporates market prepayment assumptions;

▪cash flows for structured securities are estimated using a third-party vendor in conjunction with the prepayments provided by the third-party mortgage analytics vendor;

▪nonmaturity deposit pricing is projected based on Northern Trust’s actual historical patterns and management judgment, depending upon the availability of historical data and current pricing strategies or judgment; and

▪new business rates are based on current spreads to market indices.

The following table shows the estimated NII impact over the next twelve months of 100 and 200 basis point upward and 100 basis point downward movements in interest rates relative to forward rates. Each rate movement is assumed to occur gradually over a one-year period.

TABLE 32: NET INTEREST INCOME SENSITIVITY AS OF SEPTEMBER 30, 2020

($ In Millions)	INCREASE (DECREASE) ESTIMATED IMPACT ON NEXT TWELVE MONTHS OF NET INTEREST INCOME
Increase in Interest Rates Above Market Implied Forward Rates
100 Basis Points	$	192
200 Basis Points	337
Decrease in Interest Rates Below Market Implied Forward Rates
100 Basis Points	$	78

The NII sensitivity analysis does not incorporate certain management actions that may be used to mitigate adverse effects of actual interest rate movement. For that reason and others, the estimated impacts do not reflect the likely actual results but serve as estimates of interest rate risk. NII sensitivity is not comparable to actual results disclosed elsewhere or directly predictive of future values of other measures provided.

MVE Sensitivity — MVE is defined as the present value of assets minus the present value of liabilities, net of the value of financial derivatives that are used to manage the interest rate risk of balance sheet items. The potential effect of interest rate changes on MVE is derived from the impact of such changes on projected future cash flows and the present value of these cash flows and is then compared to the established limit. Northern Trust uses current market rates (and the future rates implied by these market rates) as the base case and measures MVE sensitivity under various rate scenarios. Stress testing of interest rates is performed to include such scenarios as immediate parallel shocks to rates, nonparallel (i.e., twist) changes to yield curves that result in their becoming steeper or flatter, and changes to the relationship among the yield curves (i.e., basis risk).

The MVE sensitivity analysis incorporates certain critical assumptions such as interest rates and client behaviors under changing rate environments. These assumptions are based on a combination of historical analysis and future expected pricing behavior. The simulation cannot precisely estimate MVE sensitivity given uncertainty in the assumptions. Many of the assumptions that apply to NII sensitivity also apply to MVE sensitivity simulations, with the following separate key assumptions incorporated into the MVE simulation:

33

MARKET RISK MANAGEMENT (continued)

▪the present value of nonmaturity deposits are estimated using dynamic decay methodologies or estimated remaining lives, which are based on a combination of Northern Trust’s actual historical runoff patterns and management judgment — some balances are assumed to be core and have longer lives while other balances are assumed to be temporary and have comparatively shorter lives;

▪the present values of most noninterest-related balances (such as receivables, equipment, and payables) are the same as their book values; and

▪Monte Carlo simulation is used to generate forward interest rate paths.

The following table shows the estimated impact on MVE of 100 and 200 basis point shocks up and a 100 basis point shock down from current market implied forward rates.

TABLE 33: MARKET VALUE OF EQUITY SENSITIVITY AS OF SEPTEMBER 30, 2020

($ In Millions)	INCREASE (DECREASE) ESTIMATED IMPACT ON MARKET VALUE OF EQUITY
Increase in Interest Rates Above Market Implied Forward Rates
100 Basis Points	$	275
200 Basis Points	80
Decrease in Interest Rates Below Market Implied Forward Rates
100 Basis Points	$	594

The MVE simulations do not incorporate certain management actions that may be used to mitigate adverse effects of actual interest rate movements. For that reason and others, the estimated impacts do not reflect the likely actual results but serve as estimates of interest rate risk. MVE sensitivity is not comparable to actual results disclosed elsewhere or directly predictive of future values of other measures provided.

Foreign Currency Value-At-Risk (VaR) — Northern Trust measures daily the risk of loss associated with all non-U.S. currency positions using a VaR model and applying the historical simulation methodology. This statistical model provides estimates, based on a variety of high confidence levels, of the potential loss in value that might be incurred if an adverse shift in non-U.S. currency exchange rates were to occur over a small number of days. The model incorporates foreign currency and interest rate volatilities and correlations in price movements among the currencies. VaR is computed for each trading desk and for the global portfolio.

Northern Trust monitors several variations of the global foreign exchange (GFX) VaR measures to meet specific regulatory and internal management needs. Variations include different methodologies (historical simulation, Monte Carlo simulation and Taylor approximation), horizons of one day and ten days, confidence levels of 95% and 99%, subcomponent VaRs using only foreign exchange (FX) drivers and only interest rate (IR) drivers, and look-back periods of one year, two years, and four years. Those alternative measures provide management an array of corroborating metrics and alternative perspectives on Northern Trust’s market risks.

During the three and nine months ended September 30, 2020, Northern Trust experienced no days with an actual trading loss in excess of the daily value-at-risk estimate.

The table below presents the levels of total regulatory VaR and its subcomponents for GFX in the periods indicated below, based on the historical simulation methodology, a 99% confidence level, a one-day horizon and equally-weighted volatility. The total VaR for GFX is typically less than the sum of its two subcomponents due to diversification benefits derived from the two subcomponents.

TABLE 34: GLOBAL FOREIGN CURRENCY VALUE-AT-RISK

($ In Millions)	TOTAL VaR (FX AND IR DRIVERS)				FX VaR (FX DRIVERS ONLY)				IR VaR (IR DRIVERS ONLY)
THREE MONTHS ENDED	SEPTEMBER 30, 2020		JUNE 30, 2020		SEPTEMBER 30, 2020		JUNE 30, 2020		SEPTEMBER 30, 2020		JUNE 30, 2020
High	$	0.6	$	0.4	$	0.3	$	0.4	$	0.5	$	0.3
Low	0.2		0.1		—		0.1		0.1		0.1
Average	0.3		0.2		0.2		0.1		0.2		0.1
Quarter-End	0.3		0.3		0.2		0.1		0.4		0.3

34

RECONCILIATION TO FULLY TAXABLE EQUIVALENT

The following table presents a reconciliation of interest income, net interest income, net interest margin, and total revenue prepared in accordance with GAAP to such measures on an FTE basis, which are non-GAAP financial measures. Net interest margin is calculated by dividing annualized net interest income by average interest-earning assets. Management believes this presentation provides a clearer indication of these financial measures for comparative purposes. When adjusted to an FTE basis, yields on taxable, nontaxable and partially taxable assets are comparable; however, the adjustment to an FTE basis has no impact on net income.

TABLE 35: RECONCILIATION TO FULLY TAXABLE EQUIVALENT

	THREE MONTHS ENDED SEPTEMBER 30,						NINE MONTHS ENDED SEPTEMBER 30,
($ In Millions)	2020			2019			2020			2019
Net Interest Income
Interest Income - GAAP	$	355.4		$	620.8		$	1,290.9		$	1,923.8
Add: FTE Adjustment	7.9			7.6			23.7			23.1
Interest Income (FTE) - Non-GAAP	$	363.3		$	628.4		$	1,314.6		$	1,946.9
Net Interest Income - GAAP	$	328.6		$	417.7		$	1,108.8		$	1,257.1
Add: FTE Adjustment	7.9			7.6			23.7			23.1
Net Interest Income (FTE) - Non-GAAP	$	336.5		$	425.3		$	1,132.5		$	1,280.2
Net Interest Margin - GAAP	1.01		%	1.58		%	1.22		%	1.57		%
Net Interest Margin (FTE) - Non-GAAP	1.03		%	1.61		%	1.24		%	1.60		%
Total Revenue
Total Revenue - GAAP	$	1,485.1		$	1,537.9		$	4,578.9		$	4,525.4
Add: FTE Adjustment	7.9			7.6			23.7			23.1
Total Revenue (FTE) - Non-GAAP	$	1,493.0		$	1,545.5		$	4,602.6		$	4,548.5

35

FORWARD-LOOKING STATEMENTS

This report may include statements which constitute “forward-looking statements” within the meaning of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements are identified typically by words or phrases such as “believe,” “expect,” “anticipate,” “intend,” “estimate,” “project,” “likely,” “plan,” “goal,” “target,” “strategy,” and similar expressions or future or conditional verbs such as “may,” “will,” “should,” “would,” and “could.” Forward-looking statements include statements, other than those related to historical facts, that relate to Northern Trust’s financial results and outlook; capital adequacy; dividend policy and share repurchase program; accounting estimates and assumptions; credit quality including allowance levels; future pension plan contributions; effective tax rate; anticipated expense levels; contingent liabilities; acquisitions; strategies; market and industry trends; and expectations regarding the impact of accounting pronouncements and legislation. These statements are based on Northern Trust’s current beliefs and expectations of future events or future results, and involve risks and uncertainties that are difficult to predict and subject to change. These statements are also based on assumptions about many important factors, including:

•financial market disruptions or economic recession or depression in the United States or other countries across the globe resulting from any of a number of factors, including, for example, the ongoing COVID-19 pandemic and governmental and societal responses thereto;

•volatility or changes in financial markets, including debt and equity markets, that impact the value, liquidity, or credit ratings of financial assets in general, or financial assets held in particular investment funds or client portfolios, including those funds, portfolios, and other financial assets with respect to which Northern Trust has taken, or may in the future take, actions to provide asset value stability or additional liquidity;

•the impact of equity markets on fee revenue;

•the downgrade of U.S. government-issued and other securities;

•changes in foreign exchange trading client volumes and volatility in foreign currency exchange rates, changes in the valuation of the U.S. dollar relative to other currencies in which Northern Trust records revenue or accrues expenses, and Northern Trust’s success in assessing and mitigating the risks arising from all such changes and volatility;

•a decline in the value of securities held in Northern Trust’s investment portfolio, particularly asset-backed securities, the liquidity and pricing of which may be negatively impacted by periods of economic turmoil and financial market disruptions;

•Northern Trust’s ability to address operating risks, including those related to cyber-security, data security, human errors or omissions, pricing or valuation of securities, fraud, systems performance or defects, systems interruptions, and breakdowns in processes or internal controls;

•Northern Trust’s success in responding to and investing in changes and advancements in technology;

•a significant downgrade of any of Northern Trust’s debt ratings;

•the health and soundness of the financial institutions and other counterparties with which Northern Trust conducts business;

•uncertainties inherent in the complex and subjective judgments required to assess credit risk and establish appropriate allowances therefor;

•changes in the availability of the London Interbank Offered Rate (LIBOR) or the calculation of alternative interest rate benchmarks;

•the pace and extent of continued globalization of investment activity and growth in worldwide financial assets;

•changes in interest rates or in the monetary or other policies of various regulatory authorities or central banks;

•changes in the legal, regulatory and enforcement framework and oversight applicable to financial institutions, including Northern Trust;

•increased costs of compliance and other risks associated with changes in regulation, the current regulatory environment, and areas of increased regulatory emphasis and oversight in the United States and other countries, such as anti-money laundering, anti-bribery, and data privacy;

•failure to satisfy regulatory standards or to obtain regulatory approvals when required, including for the use and distribution of capital;

•changes in tax laws, accounting requirements or interpretations and other legislation in the United States or other countries that could affect Northern Trust or its clients;

•geopolitical risks, risks related to global climate change and the risks of extraordinary events such as natural disasters, pandemics, terrorist events and war, and the responses of the United States and other countries to those events;

•the departure of the United Kingdom from the European Union, commonly referred to as “Brexit,” and any negative effects thereof on global economic conditions, global financial markets, and our business and results of operations;

•changes in the nature and activities of Northern Trust’s competition;

•Northern Trust’s success in maintaining existing business and continuing to generate new business in existing and targeted markets and its ability to deploy deposits in a profitable manner consistent with its liquidity requirements;

•Northern Trust’s ability to address the complex needs of a global client base and manage compliance with legal, tax, regulatory and other requirements;

•Northern Trust’s ability to maintain a product mix that achieves acceptable margins;

36

FORWARD-LOOKING STATEMENTS (continued)

•Northern Trust’s ability to continue to generate investment results that satisfy clients and to develop an array of investment products;

•Northern Trust’s success in recruiting and retaining the necessary personnel to support business growth and expansion and maintain sufficient expertise to support increasingly complex products and services;

•Northern Trust’s success in implementing its expense management initiatives;

•uncertainties inherent in Northern Trust’s assumptions concerning its pension plan, including discount rates and expected contributions, returns and payouts;

•Northern Trust’s success in continuing to enhance its risk management practices and controls and managing risks inherent in its businesses, including credit risk, operational risk, market and liquidity risk, fiduciary risk, compliance risk and strategic risk;

•risks and uncertainties inherent in the litigation and regulatory processes, including the possibility that losses may be in excess of Northern Trust’s recorded liability and estimated range of possible loss for litigation exposures;

•risks associated with being a holding company, including Northern Trust’s dependence on dividends from its principal subsidiary;

•the risk of damage to Northern Trust’s reputation which may undermine the confidence of clients, counterparties, rating agencies, and stockholders; and

•other factors identified elsewhere in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2019, including those factors described in Item 1A, “Risk Factors,” and other filings with the SEC, all of which are available on Northern Trust’s website.

Actual results may differ materially from those expressed or implied by forward-looking statements. The information contained herein is current only as of the date of that information. All forward-looking statements included in this document are based upon information presently available, and Northern Trust assumes no obligation to update its forward-looking statements.

37

Item 1. Consolidated Financial Statements (unaudited)

CONSOLIDATED BALANCE SHEETS (UNAUDITED) NORTHERN TRUST CORPORATION

(In Millions Except Share Information)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
	(Unaudited)
ASSETS
Cash and Due from Banks	$	4,737.5	$	4,459.2
Federal Reserve and Other Central Bank Deposits	39,244.6		33,886.0
Interest-Bearing Deposits with Banks	2,754.4		4,877.1
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,533.4		712.8
Debt Securities
Available for Sale (Amortized cost of $41,659.2 and $38,722.2)	42,551.0		38,876.3
Held to Maturity (Fair value of $16,746.5 and $12,249.3)	16,754.0		12,284.5
Trading Account	0.6		0.3
Total Debt Securities	59,305.6		51,161.1
Loans and Leases
Commercial	14,581.7		14,001.3
Personal	18,184.6		17,408.3
Total Loans and Leases (Net of unearned income of $14.6 and $14.1)	32,766.3		31,409.6
Allowance for Credit Losses	(223.0)		(104.5)
Buildings and Equipment	510.0		483.3
Client Security Settlement Receivables	2,296.8		845.7
Goodwill	698.0		696.8
Other Assets	8,458.4		8,401.3
Total Assets	$	152,082.0	$	136,828.4
LIABILITIES
Deposits
Demand and Other Noninterest-Bearing	$	16,358.5	$	14,114.7
Savings, Money Market and Other Interest-Bearing	25,379.1		21,441.5
Savings Certificates and Other Time	1,486.7		986.7
Non U.S. Offices — Noninterest-Bearing	18,019.2		12,177.4
— Interest-Bearing	61,345.6		60,400.3
Total Deposits	122,589.1		109,120.6
Federal Funds Purchased	2,203.7		552.9
Securities Sold Under Agreements to Repurchase	269.8		489.7
Other Borrowings	5,771.7		6,744.8
Senior Notes	3,655.6		2,573.0
Long-Term Debt	1,196.0		1,148.1
Floating Rate Capital Debt	277.7		277.7
Other Liabilities	4,539.3		4,830.6
Total Liabilities	140,502.9		125,737.4
STOCKHOLDERS' EQUITY
Preferred Stock, No Par Value; Authorized 10,000,000 shares:
Series C, outstanding shares of 0 and 16,000	—		388.5
Series D, outstanding shares of 5,000	493.5		493.5
Series E, outstanding shares of 16,000	391.4		391.4
Common Stock, $1.66 2/3 Par Value; Authorized 560,000,000 shares;
Outstanding shares of 208,121,233 and 209,709,046	408.6		408.6
Additional Paid-In Capital	961.8		1,013.1
Retained Earnings	12,118.3		11,656.7
Accumulated Other Comprehensive Income (Loss)	424.5		(194.7)
Treasury Stock (37,050,291 and 35,462,478 shares, at cost)	(3,219.0)		(3,066.1)
Total Stockholders’ Equity	11,579.1		11,091.0
Total Liabilities and Stockholders’ Equity	$	152,082.0	$	136,828.4

See accompanying notes to the consolidated financial statements.

38

CONSOLIDATED STATEMENTS OF INCOME
(UNAUDITED) NORTHERN TRUST CORPORATION

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions Except Share Information)	2020		2019		2020		2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,003.8	$	975.5	$	2,968.9	$	2,859.9
Foreign Exchange Trading Income	61.6		59.7		221.8		186.4
Treasury Management Fees	11.6		11.2		34.0		34.1
Security Commissions and Trading Income	26.0		29.1		100.9		75.8
Other Operating Income	53.5		45.1		144.4		113.0
Investment Security Gains (Losses), net (Note)	—		(0.4)		0.1		(0.9)
Total Noninterest Income	1,156.5		1,120.2		3,470.1		3,268.3
Net Interest Income
Interest Income	355.4		620.8		1,290.9		1,923.8
Interest Expense	26.8		203.1		182.1		666.7
Net Interest Income	328.6		417.7		1,108.8		1,257.1
Provision for Credit Losses	0.5		(7.0)		127.5		(13.5)
Net Interest Income after Provision for Credit Losses	328.1		424.7		981.3		1,270.6
Noninterest Expense
Compensation	461.7		458.0		1,421.8		1,395.5
Employee Benefits	97.5		87.6		285.8		262.6
Outside Services	186.0		194.0		555.0		568.8
Equipment and Software	170.7		151.7		497.1		447.2
Occupancy	51.8		53.0		162.9		155.5
Other Operating Expense	127.0		92.0		274.6		241.6
Total Noninterest Expense	1,094.7		1,036.3		3,197.2		3,071.2
Income before Income Taxes	389.9		508.6		1,254.2		1,467.7
Provision for Income Taxes	95.4		124.0		285.8		346.6
Net Income	$	294.5	$	384.6	$	968.4	$	1,121.1
Preferred Stock Dividends	16.2		17.4		51.5		40.6
Net Income Applicable to Common Stock	$	278.3	$	367.2	$	916.9	$	1,080.5
Per Common Share
Net Income – Basic	$	1.32	$	1.70	$	4.35	$	4.95
– Diluted	1.32		1.69		4.34		4.92
Average Number of Common Shares Outstanding
– Basic	208,106,190		213,176,809		208,351,088		215,832,347
– Diluted	208,688,494		214,206,576		209,023,331		216,863,563
Note: Changes in Other-Than-Temporary-Impairment (OTTI) Losses           prior to the adoption of ASU 2016-13	$	—	$	(0.1)	$	—	$	(0.3)
Other Security Gains (Losses), net	—		(0.3)		0.1		(0.6)
Investment Security Gains (Losses), net	$	—	$	(0.4)	$	0.1	$	(0.9)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED)	NORTHERN TRUST CORPORATION
	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Net Income	$	294.5	$	384.6	$	968.4	$	1,121.1
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)
Net Unrealized Gains on Debt Securities Available for Sale	33.5		57.0		551.3		305.0
Net Unrealized Gains (Losses) on Cash Flow Hedges	1.3		(2.4)		5.3		(1.9)
Net Foreign Currency Adjustments	1.8		9.9		29.5		38.8
Net Pension and Other Postretirement Benefit Adjustments	17.5		4.3		33.1		20.8
Other Comprehensive Income	54.1		68.8		619.2		362.7
Comprehensive Income	$	348.6	$	453.4	$	1,587.6	$	1,483.8

See accompanying notes to the consolidated financial statements.

39

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY
(UNAUDITED) NORTHERN TRUST CORPORATION

	NINE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions Except Per Share Information)	PREFERRED STOCK		COMMON STOCK		ADDITIONAL PAID-IN CAPITAL		RETAINED EARNINGS		ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)		TREASURY STOCK		TOTAL
Balance at December 31, 2019	$	1,273.4	$	408.6	$	1,013.1	$	11,656.7	$	(194.7)	$	(3,066.1)	$	11,091.0
Cumulative Effect Adjustment related to the adoption of Accounting Standards Update 2016-13	—		—		—		(10.1)		—		—		(10.1)
Balance at January 1, 2020	$	1,273.4	$	408.6	$	1,013.1	$	11,646.6	$	(194.7)	$	(3,066.1)	$	11,080.9
Net Income	—		—		—		360.6		—		—		360.6
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	—		—		—		—		239.7		—		239.7
Dividends Declared:
Common Stock, $0.70 per share	—		—		—		(148.6)		—		—		(148.6)
Preferred Stock	—		—		—		(19.0)		—		—		(19.0)
Redemption of Preferred Stock, Series C	(388.5)		—		—		(11.5)		—		—		(400.0)
Stock Awards and Options Exercised	—		—		(74.8)		—		—		137.7		62.9
Stock Purchased	—		—		—		—		—		(296.8)		(296.8)
Balance at March 31, 2020	$	884.9	$	408.6	$	938.3	$	11,828.1	$	45.0	$	(3,225.2)	$	10,879.7
Net Income	—		—		—		313.3		—		—		313.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	—		—		—		—		325.4		—		325.4
Dividends Declared:
Common Stock, $0.70 per share	—		—		—		(148.2)		—		—		(148.2)
Preferred Stock	—		—		—		(4.8)		—		—		(4.8)
Stock Awards and Options Exercised	—		—		13.2		—		—		3.8		17.0
Stock Purchased	—		—		—		—		—		(0.2)		(0.2)
Balance at June 30, 2020	$	884.9	$	408.6	$	951.5	$	11,988.4	$	370.4	$	(3,221.6)	$	11,382.2
Net Income	—		—		—		294.5		—		—		294.5
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	—		—		—		—		54.1		—		54.1
Dividends Declared:
Common Stock, $0.70 per share	—		—		—		(148.4)		—		—		(148.4)
Preferred Stock	—		—		—		(16.2)		—		—		(16.2)
Stock Awards and Options Exercised	—		—		10.3		—		—		4.1		14.4
Stock Purchased	—		—		—		—		—		(1.5)		(1.5)
Balance at September 30, 2020	$	884.9	$	408.6	$	961.8	$	12,118.3	$	424.5	$	(3,219.0)	$	11,579.1

See accompanying notes to the consolidated financial statements.

40

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY
(UNAUDITED) (continued) NORTHERN TRUST CORPORATION

	NINE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions Except Per Share Information)	PREFERRED STOCK		COMMON STOCK		ADDITIONAL PAID-IN CAPITAL		RETAINED EARNINGS		ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)		TREASURY STOCK		TOTAL
Balance at January 1, 2019	$	882.0	$	408.6	$	1,068.5	$	10,776.8	$	(453.7)	$	(2,173.9)	$	10,508.3
Net Income	—		—		—		347.1		—		—		347.1
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	—		—		—		—		108.4		—		108.4
Dividends Declared:
Common Stock, $0.60 per share	—		—		—		(133.7)		—		—		(133.7)
Preferred Stock	—		—		—		(17.3)		—		—		(17.3)
Stock Awards and Options Exercised	—		—		(65.2)		—		—		126.0		60.8
Stock Purchased	—		—		—		—		—		(257.4)		(257.4)
Balance at March 31, 2019	$	882.0	$	408.6	$	1,003.3	$	10,972.9	$	(345.3)	$	(2,305.3)	$	10,616.2
Net Income	—		—		—		389.4		—		—		389.4
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	—		—		—		—		185.5		—		185.5
Dividends Declared:
Common Stock, $0.60 per share	—		—		—		(130.9)		—		—		(130.9)
Preferred Stock	—		—		—		(5.9)		—		—		(5.9)
Stock Awards and Options Exercised	—		—		10.5		—		—		11.9		22.4
Stock Purchased	—		—		—		—		—		(271.2)		(271.2)
Balance at June 30, 2019	$	882.0	$	408.6	$	1,013.8	$	11,225.5	$	(159.8)	$	(2,564.6)	$	10,805.5
Net Income	—		—		—		384.6		—		—		384.6
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)	—		—		—		—		68.8		—		68.8
Dividends Declared:
Common Stock, $0.70 per share	—		—		—		(151.5)		—		—		(151.5)
Preferred Stock	—		—		—		(17.4)		—		—		(17.4)
Stock Awards and Options Exercised	—		—		(4.1)		—		—		32.6		28.5
Stock Purchased	—		—		—		—		—		(307.2)		(307.2)
Balance at September 30, 2019	$	882.0	$	408.6	$	1,009.7	$	11,441.2	$	(91.0)	$	(2,839.2)	$	10,811.3

See accompanying notes to the consolidated financial statements.

41

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) NORTHERN TRUST CORPORATION

	NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$	968.4	$	1,121.1
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Investment Security (Losses) Gains, net	(0.1)		0.9
Amortization and Accretion of Securities and Unearned Income, net	63.3		51.7
Provision for Credit Losses	127.5		(13.5)
Depreciation on Buildings and Equipment	85.9		76.5
Amortization of Computer Software	274.0		252.6
Amortization of Intangibles	12.6		12.5
Pension Plan Contributions	(10.6)		(3.0)
Change in Receivables	47.6		(328.6)
Change in Interest Payable	(5.0)		(9.2)
Change in Collateral With Derivative Counterparties, net	(937.2)		39.8
Other Operating Activities, net	(205.9)		(245.2)
Net Cash Provided by Operating Activities	420.5		955.6
CASH FLOWS FROM INVESTING ACTIVITIES
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell	(717.9)		616.3
Change in Interest-Bearing Deposits with Banks	2,194.9		198.3
Net Change in Federal Reserve and Other Central Bank Deposits	(4,592.3)		7,032.2
Purchases of Debt Securities – Held to Maturity	(28,474.0)		(9,862.0)
Proceeds from Maturity and Redemption of Debt Securities – Held to Maturity	23,901.2		12,448.2
Purchases of Debt Securities – Available for Sale	(8,558.6)		(8,644.3)
Proceeds from Sale, Maturity and Redemption of Debt Securities – Available for Sale	5,761.9		6,910.0
Change in Loans and Leases	(1,339.6)		1,636.9
Purchases of Buildings and Equipment	(102.6)		(49.8)
Purchases and Development of Computer Software	(287.5)		(304.7)
Change in Client Security Settlement Receivables	(1,377.3)		(465.1)
Acquisition of a Business, Net of Cash Received	—		(10.5)
Bank-Owned Life Insurance Policy Premiums	—		(1,000.0)
Other Investing Activities, net	477.3		492.9
Net Cash (Used in) Provided by Investing Activities	(13,114.5)		8,998.4
CASH FLOWS FROM FINANCING ACTIVITIES
Change in Deposits	12,697.8		(6,355.5)
Change in Federal Funds Purchased	1,650.8		(2,393.7)
Change in Securities Sold under Agreements to Repurchase	(219.9)		96.9
Change in Short-Term Other Borrowings	(934.0)		(118.7)
Redemption of Preferred Stock - Series C	(400.0)		—
Proceeds from Senior Notes	993.2		498.0
Treasury Stock Purchased	(298.5)		(835.8)
Net Proceeds from Stock Options	10.7		19.9
Cash Dividends Paid on Common Stock	(438.8)		(381.0)
Cash Dividends Paid on Preferred Stock	(29.7)		(29.1)
Other Financing Activities, net	0.7		0.1
Net Cash Provided by (Used in) Financing Activities	13,032.3		(9,498.9)
Effect of Foreign Currency Exchange Rates on Cash	(60.0)		0.9
Change in Cash and Due from Banks	278.3		456.0
Cash and Due from Banks at Beginning of Year	4,459.2		4,581.6
Cash and Due from Banks at End of Year	$	4,737.5	$	5,037.6
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest Paid	$	190.3	$	675.9
Income Taxes Paid	264.5		360.3
Transfers from Loans to OREO	0.2		2.6
Transfers from Debt Securities Available for Sale to Debt Securities Held to Maturity	301.5		—

See accompanying notes to the consolidated financial statements.

42

Notes to Consolidated Financial Statements (unaudited)

Note 1 – Basis of Presentation

The consolidated financial statements include the accounts of Northern Trust Corporation (Corporation) and its wholly-owned subsidiary, The Northern Trust Company (Bank), and various other wholly-owned subsidiaries of the Corporation and Bank. Throughout the notes to the consolidated financial statements, the term “Northern Trust” refers to the Corporation and its subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. The consolidated financial statements, as of and for the periods ended September 30, 2020 and 2019, have not been audited by the Corporation’s independent registered public accounting firm. In the opinion of management, all accounting entries and adjustments, including normal recurring accruals, necessary for a fair presentation of the financial position and the results of operations for the interim periods have been made. The accounting and financial reporting policies of Northern Trust conform to U.S. generally accepted accounting principles (GAAP) and reporting practices prescribed for the banking industry. The consolidated statements of income include results of acquired subsidiaries from the dates of acquisition. Certain prior-period balances have been reclassified to conform with the current year’s presentation. For a description of Northern Trust’s significant accounting policies, refer to Note 1 — Summary of Significant Accounting Policies included under Item 8. Financial Statements and Supplementary Data in the Annual Report on Form 10-K for the year ended December 31, 2019.

Note 2 – Recent Accounting Pronouncements

On January 1, 2020, Northern Trust adopted Accounting Standards Update (ASU) No. 2016-13, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (ASU 2016-13). ASU 2016-13 significantly changed the way impairment of financial instruments is recognized by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of financial instruments. The main provisions of ASU 2016-13 include (1) replacing the “incurred loss” approach under current GAAP with an “expected loss” model for instruments measured at amortized cost, (2) requiring entities to record an allowance for available for sale debt securities rather than reduce the carrying amount of the investments, as is required by the other-than-temporary-impairment model under legacy GAAP, and (3) a simplified accounting model for purchased credit-impaired debt securities and loans.

Upon adoption of ASU 2016-13, Northern Trust recorded a $13.7 million increase in the allowance for credit losses with a corresponding cumulative effect adjustment to decrease retained earnings by $10.1 million, net of income taxes, on January 1, 2020. Northern Trust did not restate comparative periods for the effects of applying ASU 2016-13. There was no significant impact to Northern Trust’s consolidated results of operations. Please refer to Note 7 — Allowance for Credit Losses for further information.

On January 1, 2020, Northern Trust adopted ASU No. 2017-04, “Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” (ASU 2017-04). ASU 2017-04 amends the subsequent measurement of goodwill whereby Step 2 from the goodwill impairment test is eliminated. As a result, the goodwill impairment test is performed by comparing the fair value of a reporting unit to its carrying value and an impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to that reporting unit. Upon adoption of ASU 2017-04, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On January 1, 2020, Northern Trust adopted ASU No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement” (ASU 2018-13). The primary objective of ASU 2018-13 is to improve the effectiveness of disclosures in the notes to financial statements. Upon adoption of ASU 2018-13, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On January 1, 2020, Northern Trust adopted ASU No. 2018-15, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force)” (ASU 2018-15). ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). Upon adoption of ASU 2018-15, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On January 1, 2020, Northern Trust adopted ASU No. 2018-17, “Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities” (ASU 2018-17). ASU 2018-17 requires that indirect interests held through related parties in common control arrangements should be considered on a proportional basis (rather than as the equivalent of a direct interest in its entirety) for determining whether fees paid to decision makers and service providers are variable interests. Upon

43

Notes to Consolidated Financial Statements (unaudited) (continued)

adoption of ASU 2018-17, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On April 1, 2020, Northern Trust adopted ASU No. 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (ASU 2020-04). The global transition toward alternative reference rates and away from referencing the London Interbank Offered Rate (LIBOR) and other interbank offered rates (Reference Rate Reform) is expected to have a significant impact on the volume of contract modifications, hedge accounting, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of Reference Rate Reform. ASU 2020-04 provides temporary optional expedients and exceptions for applying GAAP to contract modifications, hedging relationships, and other transactions affected by Reference Rate Reform if certain criteria are met. The main provisions of ASU 2020-04 provide the following optional expedients: (1) simplification of the accounting evaluations under current GAAP for contract modifications, including loan, debt, lease and other contracts with potential embedded derivatives, if qualifying criteria are met (2) preservation of hedging relationships without dedesignation upon certain changes to the critical terms of an existing hedging relationship due to Reference Rate Reform and other optional hedge accounting relief provisions and (3) a one-time election to sell or transfer, or both sell and transfer, debt securities classified as held to maturity that reference a rate affected by Reference Rate Reform and are classified as held to maturity before January 1, 2020.

The optional expedients in ASU 2020-04 for contract modifications and hedging relationships are applied prospectively, while the one-time election to sell or transfer, or both sell and transfer debt securities classified as held to maturity may be made at any time after March 12, 2020. The optional expedients and exceptions provided by ASU 2020-04 do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022 for which an entity has elected certain optional expedients and which are retained through the end of the hedging relationship. Upon adoption of ASU 2020-04, there was no significant impact on Northern Trust’s consolidated financial condition or results of operations. Northern Trust expects to elect the optional expedients provided in ASU 2020-04 and does not expect a significant impact on Northern Trust’s consolidated financial condition or results of operations as a result of electing such expedients.

Note 3 – Fair Value Measurements

Fair Value Hierarchy. The following describes the hierarchy of valuation inputs (Levels 1, 2, and 3) used to measure fair value and the primary valuation methodologies used by Northern Trust for financial instruments measured at fair value on a recurring basis. Observable inputs reflect market data obtained from sources independent of the reporting entity; unobservable inputs reflect the entity’s own assumptions about how market participants would value an asset or liability based on the best information available. GAAP requires an entity measuring fair value to maximize the use of observable inputs and minimize the use of unobservable inputs and establishes a fair value hierarchy of inputs. Financial instruments are categorized within the hierarchy based on the lowest level input that is significant to their valuation. No transfers into or out of Level 3 occurred during the nine months ended September 30, 2020 or the twelve months ended December 31, 2019.

Level 1 — Quoted, active market prices for identical assets or liabilities.

Northern Trust’s Level 1 assets are comprised of available for sale investments in U.S. Treasury securities.

Level 2 — Observable inputs other than Level 1 prices, such as quoted active market prices for similar assets or liabilities, quoted prices for identical or similar assets in inactive markets, and model-derived valuations in which all significant inputs are observable in active markets.

Northern Trust’s Level 2 assets include available for sale and trading account debt securities, the fair values of which are determined predominantly by external pricing vendors. Prices received from vendors are compared to other vendor and third-party prices. If a security price obtained from a pricing vendor is determined to exceed pre-determined tolerance levels that are assigned based on an asset type’s characteristics, the exception is researched and, if the price is not able to be validated, an alternate pricing vendor is utilized, consistent with Northern Trust’s pricing source hierarchy. As of September 30, 2020, Northern Trust’s available for sale debt securities portfolio included 2,086 Level 2 debt securities with an aggregate market value of $38.4 billion. All 2,086 debt securities were valued by external pricing vendors. As of December 31, 2019, Northern Trust’s available for sale debt securities portfolio included 1,704 Level 2 debt securities with an aggregate market value of $34.3 billion. All 1,704 debt securities were valued by external pricing vendors. Trading account debt securities, which totaled $0.6 million and $0.3 million as of September 30, 2020 and December 31, 2019, respectively, were all valued using external pricing vendors.

44

Notes to Consolidated Financial Statements (unaudited) (continued)

Level 2 assets and liabilities also include derivative contracts which are valued internally using widely accepted income-based models that incorporate inputs readily observable in actively quoted markets and reflect the contractual terms of the contracts. Observable inputs include foreign exchange rates and interest rates for foreign exchange contracts; credit spreads, default probabilities, and recovery rates for credit default swap contracts; interest rates for interest rate swap contracts and forward contracts; and interest rates and volatility inputs for interest rate option contracts. Northern Trust evaluates the impact of counterparty credit risk and its own credit risk on the valuation of its derivative instruments. Factors considered include the likelihood of default by Northern Trust and its counterparties, the remaining maturities of the instruments, net exposures after giving effect to master netting arrangements or similar agreements, available collateral, and other credit enhancements in determining the appropriate fair value of derivative instruments. The resulting valuation adjustments have not been considered material.

Level 3 — Valuation techniques in which one or more significant inputs are unobservable in the marketplace.

Northern Trust’s Level 3 liabilities consist of swaps that Northern Trust entered into with the purchaser of 1.1 million and 1.0 million shares of Visa Inc. Class B common stock (Visa Class B common shares) previously held by Northern Trust and sold in June 2016 and 2015, respectively. Pursuant to the swaps, Northern Trust retains the risks associated with the ultimate conversion of the Visa Class B common shares into shares of Visa Inc. Class A common stock (Visa Class A common shares), such that the counterparty will be compensated for any dilutive adjustments to the conversion ratio and Northern Trust will be compensated for any anti-dilutive adjustments to the ratio. The swaps also require periodic payments from Northern Trust to the counterparty calculated by reference to the market price of Visa Class A common shares and a fixed rate of interest. The fair value of the swaps is determined using a discounted cash flow methodology. The significant unobservable inputs used in the fair value measurement are Northern Trust’s own assumptions about estimated changes in the conversion rate of the Visa Class B common shares into Visa Class A common shares, the date on which such conversion is expected to occur and the estimated growth rate of the Visa Class A common share price. See “Visa Class B Common Shares” under Note 19 — Commitments and Contingent Liabilities for further information.

Northern Trust believes its valuation methods for its assets and liabilities carried at fair value are appropriate; however, the use of different methodologies or assumptions, particularly as applied to Level 3 assets and liabilities, could have a material effect on the computation of their estimated fair values.

The following table presents the fair values of Northern Trust’s Level 3 liabilities as of September 30, 2020 and December 31, 2019, as well as the valuation techniques, significant unobservable inputs, and quantitative information used to develop significant unobservable inputs for such liabilities as of such dates.

TABLE 36: LEVEL 3 SIGNIFICANT UNOBSERVABLE INPUTS

	SEPTEMBER 30, 2020
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$32.3 million	Discounted Cash Flow	Conversion Rate	1.62x			1.62x
			Visa Class A Appreciation	8.70%			8.70%
			Expected Duration	12	-	33 months	20 months

⁽¹⁾ Weighted average of expected duration based on scenario probability.

	DECEMBER 31, 2019
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$33.4 million	Discounted Cash Flow	Conversion Rate	1.62x			1.62x
			Visa Class A Appreciation	8.54%			8.54%
			Expected Duration	12	-	36 months	22 months

⁽¹⁾ Weighted average of expected duration based on scenario probability.

45

Notes to Consolidated Financial Statements (unaudited) (continued)

The following table presents assets and liabilities measured at fair value on a recurring basis as of September 30, 2020 and December 31, 2019, segregated by fair value hierarchy level.

TABLE 37: RECURRING BASIS HIERARCHY LEVELING

	SEPTEMBER 30, 2020
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	4,165.2	$	—	$	—	$	—	$	4,165.2
Obligations of States and Political Subdivisions	—		2,600.5		—		—		2,600.5
Government Sponsored Agency	—		24,568.8		—		—		24,568.8
Non-U.S. Government	—		937.6		—		—		937.6
Corporate Debt	—		2,627.4		—		—		2,627.4
Covered Bonds	—		516.8		—		—		516.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,552.8		—		—		2,552.8
Other Asset-Backed	—		3,559.4		—		—		3,559.4
Commercial Mortgage-Backed	—		1,015.2		—		—		1,015.2
Other	—		7.3		—		—		7.3
Total Available for Sale	4,165.2		38,385.8		—		—		42,551.0
Trading Account	0.3		0.3		—		—		0.6
Total Available for Sale and Trading Debt Securities	4,165.5		38,386.1		—		—		42,551.6
Other Assets
Derivative Assets
Foreign Exchange Contracts	—		2,279.5		—		(1,405.7)		873.8
Interest Rate Contracts	—		333.7		—		(2.6)		331.1
Total Derivative Assets	—		2,613.2		—		(1,408.3)		1,204.9
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		2,326.3		—		(1,493.6)		832.7
Interest Rate Contracts	—		142.2		—		(109.7)		32.5
Other Financial Derivatives(1)	—		—		32.3		—		32.3
Total Derivative Liabilities	$	—	$	2,468.5	$	32.3	$	(1,603.3)	$	897.5

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of September 30, 2020, derivative assets and liabilities shown above also include reductions of $212.7 million and $407.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

⁽¹⁾This line consists of swaps related to the sale of certain Visa Class B common shares.

46

Notes to Consolidated Financial Statements (unaudited) (continued)

	DECEMBER 31, 2019
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	4,549.1	$	—	$	—	$	—	$	4,549.1
Obligations of States and Political Subdivisions	—		1,615.3		—		—		1,615.3
Government Sponsored Agency	—		23,271.2		—		—		23,271.2
Non-U.S. Government	—		3.3		—		—		3.3
Corporate Debt	—		2,402.7		—		—		2,402.7
Covered Bonds	—		769.9		—		—		769.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,127.6		—		—		2,127.6
Other Asset-Backed	—		3,330.5		—		—		3,330.5
Commercial Mortgage-Backed	—		797.7		—		—		797.7
Other	—		9.0		—		—		9.0
Total Available for Sale	4,549.1		34,327.2		—		—		38,876.3
Trading Account	—		0.3		—		—		0.3
Total Available for Sale and Trading Debt Securities	4,549.1		34,327.5		—		—		38,876.6
Other Assets
Derivative Assets
Foreign Exchange Contracts	—		3,234.8		—		(2,334.1)		900.7
Interest Rate Contracts	—		152.9		—		(3.9)		149.0
Total Derivative Assets	—		3,387.7		—		(2,338.0)		1,049.7
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		3,182.2		—		(1,548.6)		1,633.6
Interest Rate Contracts	—		97.4		—		(57.3)		40.1
Other Financial Derivatives(1)	—		—		33.4		(12.5)		20.9
Total Derivative Liabilities	$	—	$	3,279.6	$	33.4	$	(1,618.4)	$	1,694.6

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2019, derivative assets and liabilities shown above also include reductions of $1,136.8 million and $417.2 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

⁽¹⁾ This line consists of swaps related to the sale of certain Visa Class B common shares.

47

Notes to Consolidated Financial Statements (unaudited) (continued)

The following table presents the changes in Level 3 liabilities for the three and nine months ended September 30, 2020 and 2019.

TABLE 38: CHANGES IN LEVEL 3 LIABILITIES

(In Millions)	SWAPS RELATED TO SALE OF CERTAIN VISA CLASS B COMMON SHARES
THREE MONTHS ENDED SEPTEMBER 30,	2020		2019
Fair Value at July 1	$	31.3	$	34.7
Total (Gains) Losses:
Included in Earnings(1)	5.3		6.7
Purchases, Issues, Sales, and Settlements
Settlements	(4.3)		(3.7)
Fair Value at September 30	$	32.3	$	37.7

⁽¹⁾ (Gains) losses are recorded in Other Operating Income on the consolidated statements of income.

NINE MONTHS ENDED SEPTEMBER 30,	2020		2019
Fair Value at January 1	$	33.4	$	32.8
Total (Gains) Losses:
Included in Earnings(1)	11.0		14.9
Purchases, Issues, Sales, and Settlements
Settlements	(12.1)		(10.0)
Fair Value at September 30	$	32.3	$	37.7

⁽¹⁾ (Gains) losses are recorded in Other Operating Income on the consolidated statements of income.

Carrying values of assets and liabilities that are not measured at fair value on a recurring basis may be adjusted to fair value in periods subsequent to their initial recognition, for example, to record an impairment of an asset. GAAP requires entities to separately disclose these subsequent fair value measurements and to classify them under the fair value hierarchy.

Assets measured at fair value on a nonrecurring basis at September 30, 2020 and December 31, 2019, all of which were categorized as Level 3 under the fair value hierarchy, were comprised of nonaccrual loans whose values were based on real estate and other available collateral, and of other real estate owned (OREO) properties.

Fair values of real estate loan collateral were estimated using a market approach typically supported by third-party valuations and property-specific fees and taxes. The fair values of real estate loan collateral were subject to adjustments to reflect management’s judgment as to realizable value and consisted of discount factors ranging from 15.0% to 20.0% with a weighted average based on fair values of 15.2% and 15.3% as of September 30, 2020 and December 31, 2019, respectively. Other loan collateral, which typically consists of accounts receivable, inventory and equipment, is valued using a market approach adjusted for asset-specific characteristics and in limited instances third-party valuations are used. OREO assets are carried at the lower of cost or fair value less estimated costs to sell, with fair value typically based on third-party appraisals.

Collateral-based nonaccrual loans that have been adjusted to fair value totaled $21.2 million and $8.0 million at September 30, 2020 and December 31, 2019, respectively.

The following table presents the fair values of Northern Trust’s Level 3 assets that were measured at fair value on a nonrecurring basis as of September 30, 2020 and December 31, 2019, as well as the valuation technique, significant unobservable inputs and quantitative information used to develop the significant unobservable inputs for such assets as of such dates.

TABLE 39: LEVEL 3 NONRECURRING BASIS SIGNIFICANT UNOBSERVABLE INPUTS

	SEPTEMBER 30, 2020
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES
Loans	$21.2 million	Market Approach	Discount factor applied to real estate collateral-based loans to reflect realizable value	15.0%	-	20.0%	15.2%

⁽¹⁾ Includes real estate collateral-based loans and other collateral-based loans.

	DECEMBER 31, 2019
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES				WEIGHTED-AVERAGE INPUT VALUES
Loans	$8.0 million	Market Approach	Discount factor applied to real estate collateral-based loans to reflect realizable value	15.0	%	-	20.0%	15.3%

⁽¹⁾ Includes real estate collateral-based loans and other collateral-based loans.

48

Notes to Consolidated Financial Statements (unaudited) (continued)

The following table summarizes the fair values of all financial instruments.

TABLE 40: FAIR VALUE OF FINANCIAL INSTRUMENTS

	SEPTEMBER 30, 2020
					FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
ASSETS
Cash and Due from Banks	$	4,737.5	$	4,737.5	$	4,737.5	$	—	$	—
Federal Reserve and Other Central Bank Deposits	39,244.6		39,244.6		—		39,244.6		—
Interest-Bearing Deposits with Banks	2,754.4		2,754.4		—		2,754.4		—
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,533.4		1,533.4		—		1,533.4		—
Debt Securities
Available for Sale(1)	42,551.0		42,551.0		4,165.2		38,385.8		—
Held to Maturity	16,754.0		16,746.5		99.0		16,647.5		—
Trading Account	0.6		0.6		0.3		0.3		—
Loans (excluding Leases)
Held for Investment	32,521.2		33,001.4		—		—		33,001.4
Client Security Settlement Receivables	2,296.8		2,296.8		—		2,296.8		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	239.7		239.7		—		239.7		—
Community Development Investments	761.3		761.3		—		761.3		—
Employee Benefit and Deferred Compensation	214.6		230.0		143.6		86.4		—
LIABILITIES
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	$	59,756.8	$	59,756.8	$	59,756.8	$	—	$	—
Savings Certificates and Other Time	1,486.7		1,496.5		—		1,496.5		—
Non U.S. Offices Interest-Bearing	61,345.6		61,345.6		—		61,345.6		—
Federal Funds Purchased	2,203.7		2,203.7		—		2,203.7		—
Securities Sold Under Agreements to Repurchase	269.8		269.8		—		269.8		—
Other Borrowings	5,771.7		5,772.9		—		5,772.9		—
Senior Notes	3,655.6		3,731.0		—		3,731.0		—
Long-Term Debt
Subordinated Debt	1,196.0		1,250.0		—		1,250.0		—
Floating Rate Capital Debt	277.7		255.6		—		255.6		—
Other Liabilities
Standby Letters of Credit	23.9		23.9		—		—		23.9
Loan Commitments	55.7		55.7		—		—		55.7
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	36.8	$	36.8	$	—	$	36.8	$	—
Liabilities	112.8		112.8		—		112.8		—
Interest Rate Contracts
Assets	10.5		10.5		—		10.5		—
Liabilities	18.9		18.9		—		18.9		—
Other Financial Derivatives
Liabilities(2)	32.3		32.3		—		—		32.3
Client-Related and Trading
Foreign Exchange Contracts
Assets	2,242.7		2,242.7		—		2,242.7		—
Liabilities	2,213.5		2,213.5		—		2,213.5		—
Interest Rate Contracts
Assets	323.2		323.2		—		323.2		—
Liabilities	123.3		123.3		—		123.3		—

⁽¹⁾ Refer to the table located on page 46 for the disaggregation of available for sale debt securities.

⁽²⁾ This line consists of swaps related to the sale of certain Visa Class B common shares.

49

Notes to Consolidated Financial Statements (unaudited) (continued)

	DECEMBER 31, 2019
					FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
ASSETS
Cash and Due from Banks	$	4,459.2	$	4,459.2	$	4,459.2	$	—	$	—
Federal Reserve and Other Central Bank Deposits	33,886.0		33,886.0		—		33,886.0		—
Interest-Bearing Deposits with Banks	4,877.1		4,877.1		—		4,877.1		—
Federal Funds Sold and Securities Purchased under Agreements to Resell	712.8		712.8		—		712.8		—
Debt Securities
Available for Sale(1)	38,876.3		38,876.3		4,549.1		34,327.2		—
Held to Maturity	12,284.5		12,249.3		138.8		12,110.5		—
Trading Account	0.3		0.3		—		0.3		—
Loans (excluding Leases)
Held for Investment	31,239.5		31,517.8		—		—		31,517.8
Client Security Settlement Receivables	845.7		845.7		—		845.7		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	301.2		301.2		—		301.2		—
Community Development Investments	749.3		749.3		—		749.3		—
Employee Benefit and Deferred Compensation	199.5		207.6		131.0		76.6		—
LIABILITIES
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	$	47,733.6	$	47,733.6	$	47,733.6	$	—	$	—
Savings Certificates and Other Time	986.7		994.2		—		994.2		—
Non U.S. Offices Interest-Bearing	60,400.3		60,400.3		—		60,400.3		—
Federal Funds Purchased	552.9		552.9		—		552.9		—
Securities Sold Under Agreements to Repurchase	489.7		489.7		—		489.7		—
Other Borrowings	6,744.8		6,745.9		—		6,745.9		—
Senior Notes	2,573.0		2,593.0		—		2,593.0		—
Long-Term Debt
Subordinated Debt	1,148.1		1,169.5		—		1,169.5		—
Floating Rate Capital Debt	277.7		262.1		—		262.1		—
Other Liabilities
Standby Letters of Credit	25.5		25.5		—		—		25.5
Loan Commitments	32.3		32.3		—		—		32.3
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	83.1	$	83.1	$	—	$	83.1	$	—
Liabilities	24.1		24.1		—		24.1		—
Interest Rate Contracts
Assets	20.5		20.5		—		20.5		—
Liabilities	21.1		21.1		—		21.1		—
Other Financial Derivatives
Liabilities(2)	33.4		33.4		—		—		33.4
Client-Related and Trading
Foreign Exchange Contracts
Assets	3,151.7		3,151.7		—		3,151.7		—
Liabilities	3,158.1		3,158.1		—		3,158.1		—
Interest Rate Contracts
Assets	132.4		132.4		—		132.4		—
Liabilities	76.3		76.3		—		76.3		—

⁽¹⁾ Refer to the table located on page 47 for the disaggregation of available for sale debt securities.    

⁽²⁾ This line consists of swaps related to the sale of certain Visa Class B common shares.

50

Notes to Consolidated Financial Statements (unaudited) (continued)

Note 4 – Securities

Debt Securities Available for Sale. The following tables provide the amortized cost and fair values at September 30, 2020 and December 31, 2019, and remaining maturities of debt securities available for sale at September 30, 2020.

TABLE 41: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF DEBT SECURITIES AVAILABLE FOR SALE

	SEPTEMBER 30, 2020
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	4,083.9	$	81.3	$	—	$	4,165.2
Obligations of States and Political Subdivisions	2,465.2		136.3		1.0		2,600.5
Government Sponsored Agency	24,162.6		427.4		21.2		24,568.8
Non-U.S. Government	936.8		0.9		0.1		937.6
Corporate Debt	2,548.7		80.9		2.2		2,627.4
Covered Bonds	508.5		8.3		—		516.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,486.4		66.7		0.3		2,552.8
Other Asset-Backed	3,522.3		46.6		9.5		3,559.4
Commercial Mortgage-Backed	937.5		78.4		0.7		1,015.2
Other	7.3		—		—		7.3
Total	$	41,659.2	$	926.8	$	35.0	$	42,551.0

	DECEMBER 31, 2019
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	4,527.5	$	26.7	$	5.1	$	4,549.1
Obligations of States and Political Subdivisions	1,604.0		24.6		13.3		1,615.3
Government Sponsored Agency	23,247.5		101.8		78.1		23,271.2
Non-U.S. Government	3.3		—		—		3.3
Corporate Debt	2,378.9		27.8		4.0		2,402.7
Covered Bonds	766.3		4.4		0.8		769.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,091.3		37.4		1.1		2,127.6
Other Asset-Backed	3,324.5		11.3		5.3		3,330.5
Commercial Mortgage-Backed	769.9		28.7		0.9		797.7
Other	9.0		—		—		9.0
Total	$	38,722.2	$	262.7	$	108.6	$	38,876.3

51

Notes to Consolidated Financial Statements (unaudited) (continued)

TABLE 42: REMAINING MATURITY OF DEBT SECURITIES AVAILABLE FOR SALE

SEPTEMBER 30, 2020	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE
U.S. Government	$	1,802.3	$	1,805.4	$	1,834.8	$	1,876.1	$	446.8	$	483.7	$	—	$	—	$	4,083.9	$	4,165.2
Obligations of States and Political Subdivisions	16.4		16.4		210.9		222.8		2,187.7		2,311.0		50.2		50.3		2,465.2		2,600.5
Government Sponsored Agency	6,077.0		6,160.5		9,520.9		9,669.4		6,111.1		6,224.2		2,453.6		2,514.7		24,162.6		24,568.8
Non-U.S. Government	737.9		738.2		40.7		40.6		158.2		158.8		—		—		936.8		937.6
Corporate Debt	547.1		552.9		2,001.6		2,074.5		—		—		—		—		2,548.7		2,627.4
Covered Bonds	24.4		24.5		484.1		492.3		—		—		—		—		508.5		516.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	334.9		335.1		2,046.0		2,111.8		105.5		105.9		—		—		2,486.4		2,552.8
Other Asset-Backed	412.4		419.0		2,658.0		2,690.0		356.0		354.5		95.9		95.9		3,522.3		3,559.4
Commercial Mortgage-Backed	16.6		16.7		336.2		360.3		567.1		620.6		17.6		17.6		937.5		1,015.2
Other	7.3		7.3		—		—		—		—		—		—		7.3		7.3
Total	$	9,976.3	$	10,076.0	$	19,133.2	$	19,537.8	$	9,932.4	$	10,258.7	$	2,617.3	$	2,678.5	$	41,659.2	$	42,551.0

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

Debt Securities Available for Sale with Unrealized Losses. The following table provides information regarding debt securities available for sale with no credit losses reported that had been in a continuous unrealized loss position for less than twelve months and for twelve months or longer as of September 30, 2020 and December 31, 2019.

TABLE 43: DEBT SECURITIES AVAILABLE FOR SALE IN UNREALIZED LOSS POSITION WITH NO CREDIT LOSSES REPORTED

AS OF SEPTEMBER 30, 2020	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
Obligations of States and Political Subdivisions	$	230.4	$	1.0	$	—	$	—	$	230.4	$	1.0
Government Sponsored Agency	2,578.6		6.8		2,862.3		14.4		5,440.9		21.2
Non-U.S. Government	26.5		0.1		—		—		26.5		0.1
Corporate Debt	69.1		1.0		76.1		1.2		145.2		2.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	146.3		0.2		158.7		0.1		305.0		0.3
Other Asset-Backed	631.2		1.0		846.3		8.5		1,477.5		9.5
Commercial Mortgage-Backed	76.3		0.7		—		—		76.3		0.7
Total	$	3,758.4	$	10.8	$	3,943.4	$	24.2	$	7,701.8	$	35.0

AS OF DECEMBER 31, 2019	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
U.S. Government	$	252.2	$	2.8	$	899.7	$	2.3	$	1,151.9	$	5.1
Obligations of States and Political Subdivisions	902.4		13.3		—		—		902.4		13.3
Government Sponsored Agency	5,405.0		35.6		7,818.4		42.5		13,223.4		78.1
Corporate Debt	279.3		1.1		492.7		2.9		772.0		4.0
Covered Bonds	138.7		0.7		25.0		0.1		163.7		0.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	217.5		1.0		155.2		0.1		372.7		1.1
Other Asset-Backed	592.4		1.8		1,164.9		3.5		1,757.3		5.3
Commercial Mortgage-Backed	62.8		0.7		59.3		0.2		122.1		0.9
Total	$	7,850.3	$	57.0	$	10,615.2	$	51.6	$	18,465.5	$	108.6

As of September 30, 2020, 475 debt securities available for sale with a combined fair value of $7.7 billion were in an unrealized loss position, with their unrealized losses totaling $35.0 million. Unrealized losses related to debt securities available for sale of $21.2 million and $9.5 million related to government-sponsored agency and other asset-backed securities, respectively, are primarily attributable to changes in market interest rates and credit spreads since their purchase. Unrealized losses related to corporate debt securities with no credit losses reported of $2.2 million are primarily attributable to changes in market interest rates as well as credit spreads since their purchase. As of September 30, 2020, 21% of the corporate debt securities available for sale portfolio were backed by guarantees provided by U.S. and non-U.S. governmental entities. The remaining unrealized losses on Northern Trust’s debt securities available for sale portfolio as of September 30, 2020, are attributable to changes in overall market interest rates or credit spreads.

52

Notes to Consolidated Financial Statements (unaudited) (continued)

As of September 30, 2020, Northern Trust did not intend to sell any debt securities available for sale in an unrealized loss position and it was more likely than not that Northern Trust would not be required to sell any such investment before the recovery of its amortized cost basis, which may be maturity.

Debt securities available for sale impairment reviews are conducted quarterly to identify and evaluate securities that have indications of possible credit losses. A determination as to whether a security’s decline in market value is related to credit impairment takes into consideration numerous factors and the relative significance of any single factor can vary by security. Factors Northern Trust considers in determining whether impairment is credit related include, but are not limited to, the severity of the impairment; the cause of the impairment and the financial condition and near-term prospects of the issuer; activity in the market of the issuer, which may indicate adverse credit conditions; Northern Trust’s intent regarding the sale of the security as of the balance sheet date; and the likelihood that Northern Trust will not be required to sell the security for a period of time sufficient to allow for the recovery of the security’s amortized cost basis. For each security meeting the requirements of Northern Trust’s internal screening process, an extensive review is conducted to determine if a credit loss has occurred.

There was no provision for corporate debt securities available for sale for the three and nine months ended September 30, 2020 and no allowance for credit losses for corporate debt securities available for sale as of September 30, 2020. The process for identifying credit losses for corporate debt available for sale securities is based on the best estimate of cash flows to be collected from the security, discounted using the security’s effective interest rate. If the present value of the expected cash flows is found to be less than the current amortized cost of the security, an allowance for credit losses is generally recorded equal to the difference between the two amounts, limited to the amount the amortized cost basis exceeds the fair value of the security. For additional information, please refer to Note 7 — Allowance for Credit Losses.

For a description of Northern Trust’s accounting policies applied prior to the adoption of ASU 2016-13, refer to Note 1 — Summary of Significant Accounting Policies and Note 4 — Securities included under Item 8. Financial Statements and Supplementary Data in the Annual Report on Form 10-K for the year ended December 31, 2019.

Debt Securities Held to Maturity. The following tables provide the amortized cost and fair values at September 30, 2020 and December 31, 2019, and remaining maturities of debt securities held to maturity at September 30, 2020.

TABLE 44: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF DEBT SECURITIES HELD TO MATURITY

	SEPTEMBER 30, 2020
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S Government	$	99.0	$	—	$	—	$	99.0
Obligations of States and Political Subdivisions	2.6		0.1		—		2.7
Government Sponsored Agency	3.4		0.3		—		3.7
Non-U.S. Government	7,551.8		8.1		0.2		7,559.7
Corporate Debt	530.3		5.5		—		535.8
Covered Bonds	3,361.7		25.4		1.0		3,386.1
Certificates of Deposit	726.3		—		—		726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	3,390.5		42.8		0.3		3,433.0
Other Asset-Backed	645.8		0.7		0.2		646.3
Other	442.6		—		88.7		353.9
Total	$	16,754.0	$	82.9	$	90.4	$	16,746.5

	DECEMBER 31, 2019
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	138.8	$	—	$	—	$	138.8
Obligations of States and Political Subdivisions	10.1		0.2		—		10.3
Government Sponsored Agency	4.1		0.2		—		4.3
Non-U.S. Government	4,076.0		5.3		2.5		4,078.8
Corporate Debt	405.1		1.4		0.3		406.2
Covered Bonds	3,006.7		16.1		2.4		3,020.4
Certificates of Deposit	262.9		—		—		262.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	3,285.4		21.7		2.1		3,305.0
Other Asset-Backed	804.3		0.7		0.3		804.7
Other	291.1		0.1		73.3		217.9
Total	$	12,284.5	$	45.7	$	80.9	$	12,249.3

53

Notes to Consolidated Financial Statements (unaudited) (continued)

As of September 30, 2020, the $16.8 billion debt securities held to maturity portfolio had an unrealized loss of $88.7 million related to other residential mortgage-backed securities, which are primarily attributable to changes in overall market interest rates and credit spreads since their purchase.

TABLE 45: REMAINING MATURITY OF DEBT SECURITIES HELD TO MATURITY

SEPTEMBER 30, 2020	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
U.S. Government	$	99.0	$	99.0	$	—	$	—	$	—	$	—	$	—	$	—	$	99.0	$	99.0
Obligations of States and Political Subdivisions	1.6		1.6		1.0		1.1		—		—		—		—		2.6		2.7
Government Sponsored Agency	0.5		0.6		1.5		1.6		0.9		1.0		0.5		0.5		3.4		3.7
Non-U.S. Government	7,291.5		7,293.2		260.3		266.5		—		—		—		—		7,551.8		7,559.7
Corporate Debt	125.0		125.2		405.3		410.6		—		—		—		—		530.3		535.8
Covered Bonds	1,228.1		1,233.1		2,133.6		2,153.0		—		—		—		—		3,361.7		3,386.1
Certificates of Deposit	726.3		726.3		—		—		—		—		—		—		726.3		726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	832.7		837.1		2,325.2		2,362.7		232.6		233.2		—		—		3,390.5		3,433.0
Other Asset-Backed	190.1		190.1		435.4		435.8		20.3		20.4		—		—		645.8		646.3
Other	21.3		20.8		251.4		228.1		58.9		49.4		111.0		55.6		442.6		353.9
Total	$	10,516.1	$	10,527.0	$	5,813.7	$	5,859.4	$	312.7	$	304.0	$	111.5	$	56.1	$	16,754.0	$	16,746.5

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

Debt securities held to maturity consist of securities that management intends to, and Northern Trust has the ability to, hold until maturity. During the three months ended September 30, 2020, no securities were transferred from available for sale to held to maturity. During the nine months ended September 30, 2020, $301.5 million securities reflected in U.S. government were transferred from available for sale to held to maturity, all of which were transferred in the second quarter of 2020. During the three and nine months ended September 30, 2019, $160.8 million securities reflected in covered bonds were transferred from available for sale to held to maturity.

Credit Quality Indicators. The following table provides the amortized cost of debt securities held to maturity by credit rating.

TABLE 46: AMORTIZED COST OF DEBT SECURITIES HELD TO MATURITY BY CREDIT RATING

	AS OF SEPTEMBER 30, 2020
(In Millions)	AAA		AA		A		BBB		NOT RATED		TOTAL
U.S. Government	$	99.0	$	—	$	—	$	—	$	—	$	99.0
Obligations of States and Political Subdivisions	—		0.6		0.7		1.3		—		2.6
Government Sponsored Agency	3.4		—		—		—		—		3.4
Non-U.S. Government	335.6		1,269.7		5,899.8		46.7		—		7,551.8
Corporate Debt	3.6		254.7		272.0		—		—		530.3
Covered Bonds	3,361.7		—		—		—		—		3,361.7
Certificates of Deposit	—		—		—		—		726.3		726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,423.6		966.9		—		—		—		3,390.5
Other Asset-Backed	645.8		—		—		—		—		645.8
Other	—		—		—		—		442.6		442.6
Total	$	6,872.7	$	2,491.9	$	6,172.5	$	48.0	$	1,168.9	$	16,754.0

Credit quality indicators are metrics that provide information regarding the relative credit risk of debt securities. Northern Trust maintains a high quality debt securities portfolio, with 41% of the held to maturity portfolio at September 30, 2020, composed of U.S. Treasury and government sponsored agency securities and other triple-A rated securities. The remaining held to maturity debt securities portfolio was comprised of 15% rated double-A, 37% rated below double-A, and 7% not rated by Moody’s Investors Service, Standard and Poor’s or Fitch Ratings. Securities not explicitly rated were grouped where possible under the credit rating of the issuer of the security.

54

Notes to Consolidated Financial Statements (unaudited) (continued)

Investment Security Gains and Losses. There were no sales of debt securities during the three months ended September 30, 2020. Proceeds of $689.2 million from the sale of debt securities during the nine months ended September 30, 2020 and $177.3 million and $406.6 million from the sale of debt securities during the three- and nine- months ended September 30, 2019, respectively, resulted in the following gains and losses shown below.

TABLE 47: INVESTMENT SECURITY GAINS AND LOSSES

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Gross Realized Debt Securities Gains	$	—	$	0.1	$	3.4	$	1.6
Gross Realized Debt Securities Losses	—		(0.4)		(3.3)		(2.2)
Changes in Other-Than-Temporary Impairment Losses(1)	—		(0.1)		—		(0.3)
Net Investment Security (Losses) Gains	$	—	$	(0.4)	$	0.1	$	(0.9)

⁽¹⁾ Other-than-temporary impairment losses relate to certain Community Reinvestment Act (CRA) eligible held to maturity debt securities.

Note 5 – Securities Sold Under Agreements to Repurchase

Securities sold under agreements to repurchase are accounted for as collateralized financings and recorded at the amounts at which the securities were sold plus accrued interest. To minimize any potential credit risk associated with these transactions, the fair value of the securities sold is monitored, limits are set on exposure with counterparties, and the financial condition of counterparties is regularly assessed. Securities sold under agreements to repurchase are held by the counterparty until the repurchase.

The following table provides information regarding repurchase agreements that are accounted for as secured borrowings as of September 30, 2020 and December 31, 2019.

TABLE 48: REPURCHASE AGREEMENTS ACCOUNTED FOR AS SECURED BORROWINGS

	REMAINING CONTRACTUAL MATURITY OF THE AGREEMENTS
	OVERNIGHT AND CONTINUOUS
($ In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
U.S. Treasury and Agency Securities	$	269.8	$	489.7
Total Borrowings	269.8		489.7
Gross Amount of Recognized Liabilities for Repurchase Agreements in Note 21	269.8		489.7
Amounts related to agreements not included in Note 21	—		—

55

Notes to Consolidated Financial Statements (unaudited) (continued)

Note 6 – Loans and Leases

Amounts outstanding for loans and leases, by segment and class, are shown in the following table. During the first quarter of 2020, the Corporation implemented a change in the classification of certain loans and leases to specific segments to enhance the consistency of its reporting across various regulatory regimes. As a result, the loan and lease balances as of December 31, 2019 below have been adjusted to conform to the presentation for periods ended after such date. The adjustments generally reflect reclassification of loans from the commercial real estate class to commercial and institutional, residential real estate, and private client classes. There was no impact on total loans and leases previously reported.

TABLE 49: LOANS AND LEASES

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Commercial
Commercial and Institutional	$	9,524.0	$	9,091.1
Commercial Real Estate	3,373.6		3,104.3
Non-U.S.	1,441.0		1,576.3
Lease Financing, net	30.1		65.6
Other	213.0		164.0
Total Commercial	14,581.7		14,001.3
Personal
Private Client	11,893.0		11,071.4
Residential Real Estate	5,928.3		6,095.0
Non-U.S.	338.7		174.8
Other	24.6		67.1
Total Personal	18,184.6		17,408.3
Total Loans and Leases	$	32,766.3	$	31,409.6

Residential real estate loans consist of traditional first lien mortgages and equity credit lines that generally require a loan-to-collateral value of no more than 65% to 80% at inception. Northern Trust’s equity credit line products generally have draw periods of up to 10 years and a balloon payment of any outstanding balance is due at maturity. Payments are interest-only with variable interest rates. Northern Trust does not offer equity credit lines that include an option to convert the outstanding balance to an amortizing payment loan. As of September 30, 2020 and December 31, 2019, equity credit lines totaled $351.8 million and $448.5 million, respectively, and equity credit lines for which first liens were held by Northern Trust represented 97% of the total equity credit lines as of both September 30, 2020 and December 31, 2019.

Included within the non-U.S., commercial-other and personal-other classes are short-duration advances primarily related to the processing of custodied client investments, totaling $1.3 billion at September 30, 2020 and $1.1 billion at December 31, 2019, respectively. Demand deposit overdrafts reclassified as loan balances totaled $11.6 million and $90.4 million at September 30, 2020 and December 31, 2019, respectively.

As of September 30, 2020 and December 31, 2019, there were $18.6 million and $53.6 million of leases, respectively, classified as held for sale related to the decision to sell substantially all of the lease portfolio. As of September 30, 2020 and December 31, 2019, there were no loans classified as held for sale.

Paycheck Protection Program. In response to the COVID-19 pandemic, Northern Trust became a lender under the Paycheck Protection Program (PPP), which was created by the Coronavirus Aid, Relief, and Economic Security (CARES) Act and is administered by the U.S. Small Business Administration (SBA). Loans issued under the PPP are funded by Northern Trust directly to participating borrowers. The PPP loans are guaranteed by the SBA and borrowers are eligible to apply for PPP loan forgiveness for up to the full principal amount and accrued interest of the PPP loan.

To the extent that the borrower has used the PPP loan proceeds to cover eligible costs and has met all other SBA loan forgiveness requirements, the SBA will determine loan forgiveness under the CARES Act and will pay to Northern Trust the eligible PPP loan forgiven amount, which will be credited to the borrower’s loan to repay or pay down the PPP loan. The SBA forgiveness portal opened on August 10, 2020 and Northern Trust’s vendor portal opened on September 11, 2020 to begin processing the PPP loan forgiveness applications. 109 PPP loan forgiveness applications were in process as of September 30, 2020, though no PPP loans of the total $215.3 million PPP loans had been submitted for forgiveness approval to the SBA as of such date. When Northern Trust submits the forgiveness applications to the SBA, the SBA will have at least 90 days to respond to Northern Trust as to the approval or denial of such application.

56

Notes to Consolidated Financial Statements (unaudited) (continued)

As of September 30, 2020, Northern Trust had, net of repayments, $215.3 million or 1,127 loans, under the PPP in the commercial and institutional portfolio with an average loan balance of $0.2 million. As of September 30, 2020, for its origination efforts Northern Trust had received approximately $2.6 million in SBA fees, net of service charges.

Northern Trust accounts for loans originated under the PPP as loan receivables in accordance with Accounting Standards Codification (ASC) 310 and recognizes such loans at the principal amount less the net amount of loan origination fees. PPP loans are reported in Total Loans and Leases on the consolidated balance sheets.

The SBA provides a 100% guarantee on PPP loans covering principal and interest. Northern Trust considers the risk mitigating effects of these guarantees, and accounts for them as a credit enhancement embedded in the contract. As a result, no allowance for credit losses is measured for Northern Trust’s exposure under the PPP.

Credit Quality Indicators. Credit quality indicators are statistics, measurements or other metrics that provide information regarding the relative credit risk of loans and leases. Northern Trust utilizes a variety of credit quality indicators to assess the credit risk of loans and leases at the segment, class, and individual credit exposure levels.

As part of its credit process, Northern Trust utilizes an internal borrower risk rating system to support identification, approval, and monitoring of credit risk. Borrower risk ratings are used in credit underwriting and management reporting. Risk ratings are used for ranking the credit risk of borrowers and the probability of their default. Each borrower is rated using one of a number of ratings models, which consider both quantitative and qualitative factors. The ratings models vary among classes of loans and leases in order to capture the unique risk characteristics inherent within each particular type of credit exposure. Provided below are the more significant performance indicator attributes considered within Northern Trust’s borrower rating models, by loan and lease class.

•Commercial and Institutional: leverage, profit margin, liquidity, asset size and capital levels;

•Commercial Real Estate: debt service coverage, loan-to-value ratio, leasing status and guarantor support;

•Lease Financing and Commercial-Other: leverage, profit margin, liquidity, asset size and capital levels;

•Non-U.S.: leverage, profit margin, liquidity, return on assets and capital levels;

•Residential Real Estate: payment history, credit bureau scores and loan-to-value ratio;

•Private Client: cash-flow-to-debt and net worth ratios, leverage and liquidity; and

•Personal-Other: cash-flow-to-debt and net worth ratios.

While the criteria vary by model, the objective is for the borrower ratings to be consistent in both the measurement and ranking of risk. Each model is calibrated to a master rating scale to support this consistency. Ratings for borrowers not in default range from “1” for the strongest credits to “7” for the weakest non-defaulted credits. Ratings of “8” or “9” are used for defaulted borrowers. Borrower risk ratings are monitored and are revised when events or circumstances indicate a change is required. Risk ratings are generally validated at least annually.

Loan and lease segment and class balances as of September 30, 2020 are provided in the following table, segregated by borrower ratings into “1 to 3,” “4 to 5” and “6 to 9” (watch list and nonaccrual status) categories by year of origination at amortized cost basis. Loans that are held for investment are reported at the principal amount outstanding, net of unearned income.

57

Notes to Consolidated Financial Statements (unaudited) (continued)

TABLE 50: CREDIT QUALITY INDICATOR AT AMORTIZED COST BASIS BY ORIGINATION YEAR

September 30, 2020	TERM LOANS AND LEASES												REVOLVING LOANS		REVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)	2020		2019		2018		2017		2016		PRIOR						TOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category	$	245.2	$	571.6	$	208.2	$	142.8	$	457.8	$	465.2	$	3,286.6	$	2.0	$	5,379.4
4 to 5 Category	614.0		579.5		379.7		428.4		143.0		180.4		1,346.4		50.1		3,721.5
6 to 9 Category	36.7		134.7		39.0		29.0		38.5		20.5		124.7		—		423.1
Total Commercial and Institutional	895.9		1,285.8		626.9		600.2		639.3		666.1		4,757.7		52.1		9,524.0
Commercial Real Estate
Risk Rating:
1 to 3 Category	359.5		205.7		71.8		40.5		24.9		113.4		126.5		8.9		951.2
4 to 5 Category	453.4		758.0		294.1		110.6		178.5		383.9		72.4		13.7		2,264.6
6 to 9 Category	7.5		55.2		32.5		32.0		1.6		29.0		—		—		157.8
Total Commercial Real Estate	820.4		1,018.9		398.4		183.1		205.0		526.3		198.9		22.6		3,373.6
Non-U.S.
Risk Rating:
1 to 3 Category	790.8		15.9		10.0		10.7		—		—		32.2		—		859.6
4 to 5 Category	259.5		0.6		2.0		—		—		78.6		37.2		1.8		379.7
6 to 9 Category	0.7		23.1		—		—		—		—		177.9		—		201.7
Total Non-U.S.	1,051.0		39.6		12.0		10.7		—		78.6		247.3		1.8		1,441.0
Lease Financing, net
Risk Rating:
1 to 3 Category	—		—		—		—		—		18.5		—		—		18.5
4 to 5 Category	—		—		—		—		—		11.6		—		—		11.6
6 to 9 Category	—		—		—		—		—		—		—		—		—
Total Lease Financing, net	—		—		—		—		—		30.1		—		—		30.1
Other
Risk Rating:
1 to 3 Category	97.7		—		—		—		—		—		—		—		97.7
4 to 5 Category	115.3		—		—		—		—		—		—		—		115.3
6 to 9 Category	—		—		—		—		—		—		—		—		—
Total Other	213.0		—		—		—		—		—		—		—		213.0
Total Commercial	2,980.3		2,344.3		1,037.3		794.0		844.3		1,301.1		5,203.9		76.5		14,581.7
Personal
Private Client
Risk Rating:
1 to 3 Category	466.3		394.3		56.8		67.6		34.2		150.2		5,087.1		126.1		6,382.6
4 to 5 Category	468.4		493.6		129.6		60.0		78.1		80.9		3,952.3		145.7		5,408.6
6 to 9 Category	5.6		0.5		22.4		3.2		—		—		62.1		8.0		101.8
Total Private Client	940.3		888.4		208.8		130.8		112.3		231.1		9,101.5		279.8		11,893.0
Residential Real Estate
Risk Rating:
1 to 3 Category	1,322.9		396.2		60.9		108.9		254.2		738.0		188.2		1.5		3,070.8
4 to 5 Category	619.8		342.5		126.6		184.2		233.8		904.6		270.2		7.4		2,689.1
6 to 9 Category	13.1		9.4		1.7		0.5		2.7		108.7		32.3		—		168.4
Total Residential Real Estate	1,955.8		748.1		189.2		293.6		490.7		1,751.3		490.7		8.9		5,928.3
Non-U.S.
Risk Rating:
1 to 3 Category	8.6		21.5		—		—		—		1.8		28.2		—		60.1
4 to 5 Category	12.8		22.7		11.9		0.5		0.5		8.2		216.7		5.1		278.4
6 to 9 Category	—		—		—		—		—		0.2		—		—		0.2
Total Non-U.S.	21.4		44.2		11.9		0.5		0.5		10.2		244.9		5.1		338.7
Other
Risk Rating:
1 to 3 Category	5.5		—		—		—		—		—		—		—		5.5
4 to 5 Category	19.1		—		—		—		—		—		—		—		19.1
6 to 9 Category	—		—		—		—		—		—		—		—		—
Total Other	24.6		—		—		—		—		—		—		—		24.6
Total Personal	2,942.1		1,680.7		409.9		424.9		603.5		1,992.6		9,837.1		293.8		18,184.6
Total Loans and Leases	$	5,922.4	$	4,025.0	$	1,447.2	$	1,218.9	$	1,447.8	$	3,293.7	$	15,041.0	$	370.3	$	32,766.3

58

Notes to Consolidated Financial Statements (unaudited) (continued)

Loans and leases in the “1 to 3” category are expected to exhibit minimal to modest probabilities of default and are characterized by borrowers having the strongest financial qualities, including above average financial flexibility, cash flows and capital levels. Borrowers assigned these ratings are anticipated to experience very little to moderate financial pressure in adverse down-cycle scenarios. As a result of these characteristics, borrowers within this category exhibit a minimal to modest likelihood of loss.

Loans and leases in the “4 to 5” category are expected to exhibit moderate to acceptable probabilities of default and are characterized by borrowers with less financial flexibility than those in the “1 to 3” category. Cash flows and capital levels are generally sufficient to allow for borrowers to meet current requirements, but have fewer financial resources to manage through economic downturns. As a result of these characteristics, borrowers within this category exhibit a moderate likelihood of loss.

Loans and leases in the watch list category have elevated credit risk profiles that are monitored through internal watch lists, and consist of credits with borrower ratings of “6 to 9.” These credits, which include all nonaccrual credits, are expected to exhibit minimally acceptable probabilities of default, elevated risk of default, or are currently in default. Borrowers associated with these risk profiles that are not currently in default have limited financial flexibility. Cash flows and capital levels range from acceptable to potentially insufficient to meet current requirements, particularly in adverse down cycle scenarios. As a result of these characteristics, borrowers in this category exhibit an elevated to probable likelihood of loss.

For credit quality indicator information that was required under the former provisions of ASC Topic 310, please refer to Note 6 — Loans and Leases included under Item 8. Financial Statements and Supplementary Data in the Annual Report on Form 10-K for the year ended December 31, 2019.

59

Notes to Consolidated Financial Statements (unaudited) (continued)

Past Due Status. Past due status is based on the length of time from the contractual due date a principal or interest payment has been past due. For disclosure purposes, loans and leases that are 29 days past due or less are reported as current.

The following table provides balances and delinquency status of accrual and nonaccrual loans and leases by segment and class, as well as the other real estate owned and nonaccrual asset balances, as of September 30, 2020 and December 31, 2019.

TABLE 51: DELINQUENCY STATUS

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS AND LEASES
September 30, 2020
Commercial
Commercial and Institutional	$	9,470.9	$	21.9	$	0.2	$	0.8	$	9,493.8	$	30.2	$	9,524.0	$	11.5
Commercial Real Estate	3,361.0		0.6		8.1		—		3,369.7		3.9		3,373.6		3.9
Non-U.S.	1,441.0		—		—		—		1,441.0		—		1,441.0		—
Lease Financing, net	30.1		—		—		—		30.1		—		30.1		—
Other	213.0		—		—		—		213.0		—		213.0		—
Total Commercial	14,516.0		22.5		8.3		0.8		14,547.6		34.1		14,581.7		15.4
Personal
Private Client	11,832.8		39.4		13.3		7.5		11,893.0		—		11,893.0		—
Residential Real Estate	5,859.9		2.9		1.3		0.3		5,864.4		63.9		5,928.3		55.5
Non-U.S.	338.7		—		—		—		338.7		—		338.7		—
Other	24.6		—		—		—		24.6		—		24.6		—
Total Personal	18,056.0		42.3		14.6		7.8		18,120.7		63.9		18,184.6		55.5
Total Loans and Leases	$	32,572.0	$	64.8	$	22.9	$	8.6	$	32,668.3	$	98.0	$	32,766.3	$	70.9
	Other Real Estate Owned										$	0.9
	Total Nonaccrual Assets										$	98.9

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS AND LEASES
December 31, 2019
Commercial
Commercial and Institutional	$	9,068.3	$	4.1	$	9.9	$	1.2	$	9,083.5	$	7.6	$	9,091.1	$	0.8
Commercial Real Estate	3,089.6		2.3		4.1		4.7		3,100.7		3.6		3,104.3		2.4
Non-U.S.	1,576.3		—		—		—		1,576.3		—		1,576.3		—
Lease Financing, net	65.6		—		—		—		65.6		—		65.6		—
Other	164.0		—		—		—		164.0		—		164.0		—
Total Commercial	13,963.8		6.4		14.0		5.9		13,990.1		11.2		14,001.3		3.2
Personal
Private Client	11,027.9		33.2		9.5		0.3		11,070.9		0.5		11,071.4		0.5
Residential Real Estate	5,997.7		19.8		4.9		1.2		6,023.6		71.4		6,095.0		66.4
Non-U.S	174.1		0.2		—		—		174.3		0.5		174.8		0.5
Other	67.1		—		—		—		67.1		—		67.1		—
Total Personal	17,266.8		53.2		14.4		1.5		17,335.9		72.4		17,408.3		67.4
Total Loans and Leases	$	31,230.6	$	59.6	$	28.4	$	7.4	$	31,326.0	$	83.6	$	31,409.6	$	70.6
	Other Real Estate Owned										$	3.2
	Total Nonaccrual Assets										$	86.8

Recognition of Income. Interest income on loans and leases is recorded on an accrual basis unless, in the opinion of management, there is a question as to the ability of the debtor to meet the terms of the loan agreement, or interest or principal is more than 90 days contractually past due and the loan is not well-secured and in the process of collection. Loans meeting such criteria are classified as nonaccrual and interest income is recorded on a cash basis. At the time a loan is determined to be nonaccrual, interest accrued but not collected is reversed against interest income in the current period. Interest collected on nonaccrual loans is applied to principal unless, in the opinion of management, collectability of principal is not in doubt.

60

Notes to Consolidated Financial Statements (unaudited) (continued)

Management’s assessment of the indicators of loan and lease collectability, and its policies relative to the recognition of interest income, including the suspension and subsequent resumption of income recognition, do not meaningfully vary between loan and lease classes. Nonaccrual loans are returned to accrual status when factors indicating doubtful collectability no longer exist. Factors considered in returning a loan to accrual status are consistent across all classes of loans and leases and, in accordance with regulatory guidance, relate primarily to expected payment performance. Loans are eligible to be returned to accrual status when: (i) no principal or interest that is due is unpaid and repayment of the remaining contractual principal and interest is expected or (ii) the loan has otherwise become well-secured (possessing realizable value sufficient to discharge the debt, including accrued interest, in full) and is in the process of collection (through action reasonably expected to result in debt repayment or restoration to a current status in the near future). A loan that has not been brought fully current may be restored to accrual status provided there has been a sustained period of repayment performance (generally a minimum of six payment periods) by the borrower in accordance with the contractual terms, and Northern Trust is reasonably assured of repayment within a reasonable period of time. Additionally, a loan that has been formally restructured so as to be reasonably assured of repayment and performance according to its modified terms may be returned to accrual status, provided there was a well-documented credit evaluation of the borrower’s financial condition and prospects of repayment under the revised terms and there has been a sustained period of repayment performance (generally a minimum of six payment periods) under the revised terms.

Nonaccrual Loans and Troubled Debt Restructurings (TDRs). A loan that has been modified as a concession by Northern Trust or a bankruptcy court resulting from the debtor’s financial difficulties is referred to as a troubled debt restructuring (TDR). All TDRs are reported as TDRs starting in the calendar year of their restructuring. In subsequent years, a TDR may cease being reported as a TDR if the loan was modified at a market rate and has performed according to the modified terms for at least six payment periods. A loan that has been modified at a below market rate will return to accrual status if it satisfies the six-payment-period performance requirement.

The expected credit loss is measured based upon the present value of expected future cash flows, discounted at the effective interest rate based on the original contractual rate. If a loan’s contractual interest rate varies based on subsequent changes in an independent factor, such as an index or rate, the loan’s effective interest rate is calculated based on the factor as it changes over the life of the loan. Northern Trust elected not to project changes in the factor for purposes of estimating expected future cash flows. Further, Northern Trust elected not to adjust the effective interest rate for prepayments. If the loan is collateral dependent, the expected loss is measured based on the fair value of the collateral at the reporting date.

If the loan valuation is less than the recorded value of the loan, either an allowance is established, or a charge-off is recorded, for the difference. Smaller balance (individually less than $1 million) homogeneous loans are collectively evaluated. Northern Trust’s accounting policies for material nonaccrual loans is consistent across all classes of loans and leases.

All loans and leases with TDR modifications are evaluated for additional expected credit losses. The nature and extent of further deterioration in credit quality, including a subsequent default, is considered in the determination of an appropriate level of allowance for credit losses.

Included within nonaccrual loans were $67.5 million and $54.9 million of nonaccrual TDRs, and $33.0 million and $27.7 million of accrual TDRs as of September 30, 2020 and December 31, 2019, respectively.

There were $11.0 million and $8.2 million of aggregate undrawn loan commitments and standby letters of credit at September 30, 2020 and December 31, 2019, respectively, issued to borrowers with TDR modifications of loans.

61

Notes to Consolidated Financial Statements (unaudited) (continued)

The following table provides, by segment and class, the number of TDR modifications of loans and leases during the three- and nine- month periods ended September 30, 2020 and 2019, and the recorded investments and unpaid principal balances as of September 30, 2020 and 2019.

TABLE 52: TROUBLED DEBT RESTRUCTURINGS

	THREE MONTHS ENDED SEPTEMBER 30, 2020					NINE MONTHS ENDED SEPTEMBER 30, 2020
($ In Millions)	NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE		NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE
Commercial
Commercial and Institutional	1	$	1.0	$	1.0	3	$	25.3	$	25.5
Total Commercial	1	1.0		1.0		3	25.3		25.5
Personal
Residential Real Estate	10	17.4		17.5		16	18.3		18.7
Total Personal	10	17.4		17.5		16	18.3		18.7
Total Loans and Leases	11	$	18.4	$	18.5	19	$	43.6	$	44.2

Note: Period-end balances reflect all paydowns and charge-offs during the period.

	THREE MONTHS ENDED SEPTEMBER 30, 2019					NINE MONTHS ENDED SEPTEMBER 30, 2019
($ In Millions)	NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE		NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE
Commercial
Commercial and Institutional	—	$	—	$	—	1	$	7.6	$	8.8
Commercial Real Estate	—	—		—		2	—		—
Total Commercial	—	—		—		3	7.6		8.8
Personal
Residential Real Estate	5	3.1		3.1		31	20.6		20.8
Total Personal	5	3.1		3.1		31	20.6		20.8
Total Loans and Leases	5	$	3.1	$	3.1	34	$	28.2	$	29.6

Note: Period-end balances reflect all paydowns and charge-offs during the period.

TDR modifications involve extensions of term, deferrals of principal, interest rate concessions, and other modifications. Other modifications typically reflect other nonstandard terms which Northern Trust would not offer in non-troubled situations.

During the three and nine months ended September 30, 2020, the TDR modifications of loans within residential real estate were extensions of term, other modifications, deferred principal, and interest rate concessions. During the three and nine months ended September 30, 2020, the TDR modifications within commercial and institutional were other modifications and extensions of term.

During the three and nine months ended September 30, 2019, the TDR modifications of loans within residential real estate were extensions of term, other modifications, deferred principal and interest rate concessions. During the nine months ended September 30, 2019, the TDR modification within commercial and institutional was an other modification.

There were no residential real estate loan TDR modifications during the twelve months ended June 30, 2020, which subsequently had a payment default during the three and nine months ended September 30, 2020.

There were three residential real estate loan TDR modifications during the twelve months ended June 30, 2019, which subsequently had a payment default during the three and nine months ended September 30, 2019. The total recorded investment for these loans was approximately $1.6 million and the unpaid principal balance for these loans was approximately $1.7 million.

Northern Trust may obtain physical possession of real estate via foreclosure on an in-substance repossession. As of September 30, 2020, Northern Trust held foreclosed real estate properties with a carrying value of $0.9 million as a result of obtaining physical possession. In addition, as of September 30, 2020, Northern Trust had loans with a carrying value of $11.7 million for which formal foreclosure proceedings were in process.

TDR Relief — COVID-19. Due to the economic environment arising from the COVID-19 pandemic, there have been two forms of relief provided for classifying loans as TDRs: the Interagency Guidance (as defined below) and the CARES Act.

Various banking regulators, including the Board of Governors of the Federal Reserve System, the Federal Deposit Insurance Corporation, the National Credit Union Administration, the Office of the Comptroller of the Currency, and the Consumer Financial Protection Bureau, have issued guidance in the April 7, 2020 Interagency Statement on Loan Modifications and

62

Notes to Consolidated Financial Statements (unaudited) (continued)

Reporting for Financial Institutions Working with Customers Affected by the Coronavirus (revised) on loan modification treatment (Interagency Guidance) pursuant to which financial institutions can apply ASC 310-40 Receivables – Troubled Debt Restructurings by Creditors. In accordance with the Interagency Guidance, a loan modification is not considered a TDR if the modification is related to COVID-19; the borrower had been current (not more than 29 days past due) when the modification program was implemented; and the modification includes payment deferrals for not more than 6 months.

Under section 4013 of the CARES Act, relief provided to lenders exempting certain loan modifications which would otherwise be classified as TDRs from such classification applies for loans that were current and existing as of December 31, 2019. The TDR relief under the CARES Act applies to COVID-19-related modifications that were made from March 1, 2020 until the earlier of (a) December 31, 2020 or (b) 60 days from the date the COVID-19 national emergency officially ends.

Financial institutions may account for eligible loan modifications under the Interagency Guidance and/or the CARES Act. Northern Trust has elected to apply both the CARES Act and the Interagency Guidance, as applicable, in providing borrowers with loan modification relief in response to the COVID-19 pandemic. All other types of modifications which do not meet the CARES Act or Interagency Guidance requirements continue to be governed by existing regulations and accounting policies.

The following tables provide, by segment and class, the number of total COVID-19-related loan modifications including the loan volume and deferred principal and interest balances as of September 30, 2020, for which Northern Trust applied an exemption from TDR classification that are in active deferral (loans currently in the deferral period) or completed deferral (loans that returned to their regular payment schedule).

TABLE 53: COVID-19 LOAN MODIFICATIONS NOT CONSIDERED TDRS IN ACTIVE DEFERRAL STATUS

	SEPTEMBER 30, 2020
($ In Millions)	NUMBER OF COVID-19 RELATED MODIFICATIONS	LOAN VOLUME		DEFERRED PRINCIPAL AMOUNT		DEFERRED INTEREST AMOUNT
Commercial
Commercial and Institutional	13	$	73.2	$	0.3	$	0.5
Commercial Real Estate	2	7.3		—		—
Total Commercial	15	$	80.5	$	0.3	$	0.5
Personal
Private Client	2	$	5.2	$	—	$	0.1
Residential Real Estate	53	19.3		0.3		0.3
Total Personal	55	$	24.5	$	0.3	$	0.4
Total Loans	70	$	105.0	$	0.6	$	0.9

TABLE 54: COVID-19 LOAN MODIFICATIONS NOT CONSIDERED TDRS THAT HAVE COMPLETED DEFERRAL

	SEPTEMBER 30, 2020
($ In Millions)	NUMBER OF COVID-19 RELATED MODIFICATIONS	LOAN VOLUME		DEFERRED PRINCIPAL AMOUNT		DEFERRED INTEREST AMOUNT
Commercial
Commercial and Institutional	101	$	199.7	$	5.0	$	1.5
Commercial Real Estate	104	472.2		2.9		3.3
Total Commercial	205	$	671.9	$	7.9	$	4.8
Personal
Private Client	34	$	177.6	$	2.3	$	1.1
Residential Real Estate	346	184.8		0.5		2.0
Total Personal	380	$	362.4	$	2.8	$	3.1
Total Loans	585	$	1,034.3	$	10.7	$	7.9

Not included in the table above are 31 loans with $34.3 million in loan balances as of June 30, 2020 that had been granted payment deferrals but have since paid off.

Northern Trust continues to accrue and recognize interest income during the loan deferral period, and hence has not moved these loans to nonaccrual or reported them as past due. Further, these loan balances continue to be assessed on a collective basis for purposes of measuring an allowance for expected credit losses.

63

Notes to Consolidated Financial Statements (unaudited) (continued)

Collateral Dependent Financial Assets. A financial asset is collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. Most of Northern Trust’s collateral dependent credit exposure relates to its residential real estate portfolio for which the collateral is usually the underlying real estate property. For collateral dependent financial assets, it is Northern Trust’s policy to reserve or charge-off the difference between the amortized cost basis of the loan and the value of the collateral. The collateral dependent financial asset balance as of September 30, 2020 was immaterial to Northern Trust’s financial statements.

Note 7 – Allowance for Credit Losses

During the first quarter of 2020, the Corporation implemented a change in the classification of certain loans and leases to specific segments to enhance the consistency of its reporting across various regulatory regimes. The allowance for credit losses as of and prior to December 31, 2019 remains unadjusted, as the impact of the reclassification on the allowance was immaterial.

The Corporation adopted Accounting Standards Update (ASU) No. 2016-13, “Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments” (ASU 2016-13) on January 1, 2020, which significantly changed the way impairment of financial instruments is recognized by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of financial instruments. An opening balance sheet adjustment related to the adoption of ASU 2016-13 resulted in an increase to the allowance for credit losses of $13.7 million, with a corresponding adjustment to decrease retained earnings by $10.1 million, net of tax. For more information on the adoption of ASU 2016-13, please refer to Note 2 — Recent Accounting Pronouncements to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

Allowance and Provision for Credit Losses. The allowance for credit losses — which represents management’s estimate of lifetime expected credit losses related to various portfolios subject to credit risk, off-balance-sheet credit exposures, and specific borrower relationships — is determined by management through a disciplined credit review process. Northern Trust measures expected credit losses of financial assets with similar risk characteristics on a collective basis. A financial asset is measured individually if it does not share similar risk characteristics with other financial assets and the related allowance is determined through an individual evaluation.

Management’s estimates utilized in establishing an appropriate level of allowance for credit losses are not dependent on any single assumption. In determining an appropriate allowance level, management evaluates numerous variables, many of which are interrelated or dependent on other assumptions and estimates, and takes into consideration past events, current conditions and reasonable and supportable forecasts.

The results of the credit reserve estimation methodology are reviewed quarterly by Northern Trust’s Credit Loss Reserve Committee, which receives input from Credit Risk Management, Treasury, Corporate Finance, the Economic Research group, and each of Northern Trust’s business units. The Credit Loss Reserve Committee determines the probability weights applied to each forecast approved by Northern Trust’s Macroeconomic Scenario Design Committee, and also reviews and approves qualitative adjustments to the collective allowance in line with Northern Trust’s qualitative adjustment framework.

The following table provides information regarding changes in the total allowance for credit losses during the three and nine months ended September 30, 2020 and 2019.

TABLE 55: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES

	THREE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		DEBT SECURITIES HELD TO MATURITY		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	$	210.2	$	49.0	$	6.5	$	1.3	$	267.0
Charge-Offs	(0.8)		—		—		—		(0.8)
Recoveries	1.2		—		—		—		1.2
Net Recoveries (Charge-Offs)	0.4		—		—		—		0.4
Provision for Credit Losses	4.8		(4.1)		0.4		(0.6)		0.5
Balance at End of Period	$	215.4	$	44.9	$	6.9	$	0.7	$	267.9

64

Notes to Consolidated Financial Statements (unaudited) (continued)

	NINE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		DEBT SECURITIES HELD TO MATURITY		OTHER FINANCIAL ASSETS		TOTAL
Balance at End of Prior Period	$	104.5	$	19.9	$	—	$	—	$	124.4
Cumulative Effect Adjustment	(2.2)		8.9		6.6		0.4		13.7
Balance at Beginning of Period	102.3		28.8		6.6		0.4		138.1
Charge-Offs	(3.0)		—		—		—		(3.0)
Recoveries	5.3		—		—		—		5.3
Net Recoveries (Charge-Offs)	2.3		—		—		—		2.3
Provision for Credit Losses	110.8		16.1		0.3		0.3		127.5
Balance at End of Period	$	215.4	$	44.9	$	6.9	$	0.7	$	267.9

	THREE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		TOTAL
Balance at Beginning of Period	$	110.8	$	23.3	$	134.1
Charge-Offs	(1.1)		—		(1.1)
Recoveries	1.7		—		1.7
Net Recoveries (Charge-Offs)	0.6		—		0.6
Provision for Credit Losses	(5.7)		(1.3)		(7.0)
Balance at End of Period	$	105.7	$	22.0	$	127.7

	NINE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		TOTAL
Balance at Beginning of Period	$	112.6	$	25.6	$	138.2
Charge-Offs	(2.7)		—		(2.7)
Recoveries	5.7		—		5.7
Net Recoveries (Charge-Offs)	3.0		—		3.0
Provision for Credit Losses	(9.9)		(3.6)		(13.5)
Balance at End of Period	$	105.7	$	22.0	$	127.7

The portion of the allowance assigned to loans and leases, debt securities held to maturity, and other financial assets is presented as a contra asset in Allowance for Credit Losses on the consolidated balance sheets. The portion of the allowance assigned to undrawn loan commitments and standby letters of credit is reported in Other Liabilities on the consolidated balance sheets. For credit exposure and the associated allowance related to fee receivables, please refer to Note 14 — Revenue from Contracts with Clients. For information related to the allowance for debt securities available for sale, please refer to Note 4 — Securities. For all other financial assets recognized at amortized cost, which include Cash and Due from Banks, Other Central Bank Deposits, Interest Bearing Deposits with Banks, Federal Funds Sold, and Other Assets, please refer to the Allowance for Other Financial Assets section within this footnote.

The Provision for Credit Losses on the consolidated statements of income represents the change in the Allowance for Credit Losses and is the charge to current period earnings that is determined by management, through a disciplined credit review process, to be the amount needed to maintain the Allowance for Credit Losses at an appropriate level to absorb lifetime expected credit losses related to financial assets in scope. Actual losses may vary from current estimates and the amount of the Provision for Credit Losses may be either greater than or less than actual net charge-offs.

There was a $0.5 million Provision for Credit Losses in the current quarter as calculated under the Current Expected Credit Losses (CECL) methodology, as compared to a $7.0 million credit provision in the prior-year quarter calculated under the previous “incurred loss” model. There were net recoveries of $0.4 million during the three months ended September 30, 2020, as compared to net recoveries of $0.6 million for the three months ended September 30, 2019. The provision in the current quarter was primarily due to an increase in the reserve evaluated on a collective basis, which relates to pooled financial assets sharing similar risk characteristics. The increase in the collective basis reserve was driven by projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with increases in the private client, commercial real estate, and residential real estate portfolios, partially offset by a decrease in the commercial and institutional portfolio. The overall increase in the reserve on a collective basis was partially offset by a decrease in the reserve associated with loans evaluated on an individual basis.

65

Notes to Consolidated Financial Statements (unaudited) (continued)

There was a $127.5 million Provision for Credit Losses for the nine months ended September 30, 2020 as calculated under the CECL methodology, as compared to a $13.5 million credit provision in the prior-year period calculated under the previous “incurred loss” model. There were net recoveries of $2.3 million during the nine months ended September 30, 2020, as compared to net recoveries of $3.0 million for the nine months ended September 30, 2019. The provision in the current period was primarily due to an increase in the reserve evaluated on a collective basis driven by downgrades in the portfolio and current and projected economic conditions, both resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with the largest increases in the commercial and institutional and commercial real estate portfolios.

Forecasting and Reversion. Estimating expected lifetime credit losses requires the consideration of the effect of future economic conditions. Northern Trust employs multiple scenarios over a reasonable and supportable period (currently two years) to project future conditions. Management determines the probability weights assigned to each scenario at each quarter-end. Key variables determined to be relevant for projecting credit losses on the portfolios in scope include macroeconomic factors, such as corporate profits, unemployment, and real estate price indices, as well as financial market factors such as equity prices, volatility, and credit spreads. For periods beyond the reasonable and supportable period, Northern Trust reverts to its own historical loss experiences on a straight-line basis over four quarters.

Contractual Term. Northern Trust estimates expected credit losses over the contractual term of the financial assets adjusted for prepayments, unless prepayments are not relevant to specific portfolios or sub-portfolios. Extension and renewal options are typically not considered since it is not Northern Trust’s practice to enter into arrangements where the borrower has the unconditional option to renew, or a conditional extension option whereby the conditions are beyond Northern Trust’s control.

Accrued Interest. Accrued interest balances are reported within Other Assets on the consolidated balance sheets. Northern Trust elected not to measure an allowance for credit losses for accrued interest receivables related to its loan and securities portfolio as its policy is to write-off uncollectible accrued interest receivable balances in a timely manner. Accrued interest is written off by reversing interest income during the quarter the financial asset is moved from an accrual to a nonaccrual status.

The following table provides the amount of accrued interest excluded from the amortized cost basis of the following portfolios.

TABLE 56: ACCRUED INTEREST

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Loans and Leases	$	54.2	$	84.5
Debt Securities
Held to Maturity	$	71.7	$	82.3
Available for Sale	101.0		119.0
Other Financial Assets	$	1.7	$	14.7

The following table provides amounts of accrued interest reversed through interest income by segment for the loan and lease portfolio.

TABLE 57: ACCRUED INTEREST REVERSED THROUGH INCOME

	THREE MONTHS ENDED SEPTEMBER 30,		NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2020
Commercial	$	0.5	$	1.5
Personal	0.6		$	2.0
Total Loans and Leases	$	1.1	$	3.5

Interest income that would have been recorded for nonaccrual loans and leases in accordance with their original terms was $1.8 million for the three months ended September 30, 2019 and $5.7 million for the nine months ended September 30, 2019.

There was no accrued interest reversed through interest income related to any other financial assets for the three and nine months ended September 30, 2020 and 2019.

66

Notes to Consolidated Financial Statements (unaudited) (continued)

Allowance for the Loan and Lease Portfolio. The following table provides information regarding changes in the total allowance for credit losses, including undrawn loan commitments and standby letters of credit, by segment during the three and nine months ended September 30, 2020 and 2019.

TABLE 58: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO LOANS AND LEASES

	THREE MONTHS ENDED SEPTEMBER 30, 2020
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	162.8	$	47.4	$	210.2	$	46.1	$	2.9	$	49.0
Charge-Offs	—		(0.8)		(0.8)		—		—		—
Recoveries	0.2		1.0		1.2		—		—		—
Net Recoveries (Charge-Offs)	0.2		0.2		0.4		—		—		—
Provision for Credit Losses	(15.4)		20.2		4.8		(6.0)		1.9		(4.1)
Balance at End of Period	$	147.6	$	67.8	$	215.4	$	40.1	$	4.8	$	44.9

	NINE MONTHS ENDED SEPTEMBER 30, 2020
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at End of Prior Period	$	58.1	$	46.4	$	104.5	$	15.8	$	4.1	$	19.9
Cumulative Effect Adjustment	(5.9)		3.7		(2.2)		11.9		(3.0)		8.9
Balance at Beginning of Period	52.2		50.1		102.3		27.7		1.1		28.8
Charge-Offs	(0.1)		(2.9)		(3.0)		—		—		—
Recoveries	2.2		3.1		5.3		—		—		—
Net Recoveries (Charge-Offs)	2.1		0.2		2.3		—		—		—
Provision for Credit Losses	93.3		17.5		110.8		12.4		3.7		16.1
Balance at End of Period	$	147.6	$	67.8	$	215.4	$	40.1	$	4.8	$	44.9

	THREE MONTHS ENDED SEPTEMBER 30, 2019
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	59.9	$	50.9	$	110.8	$	18.5	$	4.8	$	23.3
Charge-Offs	—		(1.1)		(1.1)		—		—		—
Recoveries	—		1.7		1.7		—		—		—
Net Recoveries (Charge-Offs)	—		0.6		0.6		—		—		—
Provision for Credit Losses	(1.3)		(4.4)		(5.7)		(0.7)		(0.6)		(1.3)
Balance at End of Period	$	58.6	$	47.1	$	105.7	$	17.8	$	4.2	$	22.0

	NINE MONTHS ENDED SEPTEMBER 30, 2019
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	57.6	$	55.0	$	112.6	$	21.1	$	4.5	$	25.6
Charge-Offs	(0.1)		(2.6)		(2.7)		—		—		—
Recoveries	0.7		5.0		5.7		—		—		—
Net Recoveries (Charge-Offs)	0.6		2.4		3.0		—		—		—
Provision for Credit Losses	0.4		(10.3)		(9.9)		(3.3)		(0.3)		(3.6)
Balance at End of Period	$	58.6	$	47.1	$	105.7	$	17.8	$	4.2	$	22.0

The increase to the allowance for loans and leases for the three months ended September 30, 2020 was primarily due to an increase in the reserve evaluated on a collective basis, which relates to pooled financial assets sharing similar risk characteristics. The increase in the collective basis reserve was driven by projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with increases in the private client, commercial real estate, and residential real estate portfolios, partially offset by a decrease in the commercial and institutional portfolio. The overall increase in the reserve on a collective basis was partially offset by a decrease in the reserve associated with loans evaluated on an individual basis. The decrease to the allowance for undrawn loan commitments and standby letters of credit for the three months ended September 30, 2020 was primarily due to a decrease in the reserve evaluated on a collective basis driven

67

Notes to Consolidated Financial Statements (unaudited) (continued)

by projected economic conditions resulting from the ongoing COVID-19 pandemic with decreases in the non-U.S commercial and commercial and institutional portfolios, partially offset by increases in the private client portfolio.

The increase to the allowance for both loans and leases and undrawn loan commitments and standby letters of credit for the nine months ended September 30, 2020 was primarily due to an increase in the reserve evaluated on a collective basis driven by downgrades in the portfolio and current and projected economic conditions, both resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with the largest increases in the commercial and institutional and commercial real estate portfolios.

Allowance Related to Credit Exposure Evaluated on a Collective Level. Expected credit losses are measured on a collective basis as long as the financial assets included in the respective pool share similar risk characteristics. If financial assets are deemed to not share similar risk characteristics, an individual assessment is warranted.

The allowance estimation methodology for the collective assessment is primarily based on internally developed loss data specific to the Northern Trust financial asset portfolio from a historical observation period that includes both expansionary and recessionary periods. The estimation methodology and the related qualitative adjustment framework segregate the loan and lease portfolio into homogenous segments based on similar risk characteristics or risk monitoring methods.

Northern Trust utilizes a quantitative probability of default/loss given default approach for the calculation of its credit allowance on a collective basis. For each of the different parameters, specific credit models for the individual loan segments were developed. For each segment, the probability of default and the loss given default are applied to the exposure at default for each projected quarter to determine the quantitative component of the allowance. The quantitative allowance is then reviewed within the qualitative adjustment framework, through which management applies judgment by assessing internal risk factors, potential limitations in the quantitative methodology, and environmental factors that are not fully contemplated in the forecast to compute an adjustment to the quantitative allowance for each segment of the loan portfolio.

Allowance Related to Credit Exposure Evaluated on an Individual Level. The allowance is determined through an individual evaluation of loans, leases, and lending-related commitments considered impaired that is based on expected future cash flows, the value of collateral, and other factors that may impact the borrower’s ability to pay. For impaired loans for which the amount of allowance, if any, is determined based on the value of the underlying real estate collateral, third-party appraisals are typically obtained and utilized by management. These appraisals are generally less than twelve months old and are subject to adjustments to reflect management’s judgment as to the realizable value of the collateral.

The following table provides information regarding the recorded investments in loans and leases and the allowance for credit losses for loans and leases and undrawn loan commitments and standby letters of credit by segment as of September 30, 2020 and December 31, 2019.

TABLE 59: RECORDED INVESTMENTS IN LOANS AND LEASES

	SEPTEMBER 30, 2020						DECEMBER 31, 2019
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Loans and Leases
Evaluated on an Individual Level	$	34.1	$	63.9	$	98.0	$	10.4	$	81.8	$	92.2
Evaluated on a Collective Level	14,547.6		18,120.7		32,668.3		13,990.9		17,326.5		31,317.4
Total Loans and Leases	14,581.7		18,184.6		32,766.3		14,001.3		17,408.3		31,409.6
Allowance for Credit Losses on Credit Exposures
Evaluated on an Individual Level	5.6		0.4		6.0		3.4		1.6		5.0
Evaluated on a Collective Level	142.0		67.4		209.4		54.7		44.8		99.5
Allowance Assigned to Loans and Leases	147.6		67.8		215.4		58.1		46.4		104.5
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Level	2.2		—		2.2		1.9		—		1.9
Evaluated on a Collective Level	37.9		4.8		42.7		13.9		4.1		18.0
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	40.1		4.8		44.9		15.8		4.1		19.9
Total Allowance Assigned to Loans and Leases and Undrawn Loan Commitments and Standby Letters of Credit	$	187.7	$	72.6	$	260.3	$	73.9	$	50.5	$	124.4

Northern Trust analyzes its exposure to credit losses from both on-balance-sheet and off-balance-sheet activity using a consistent methodology for the quantitative framework as well as the qualitative framework. For purposes of estimating the allowance for credit losses for undrawn loan commitments and standby letters of credit, the exposure at default includes an

68

Notes to Consolidated Financial Statements (unaudited) (continued)

estimated drawdown of unused credit based on credit utilization factors, resulting in a proportionate amount of expected credit losses.

Allowance for Debt Securities Held to Maturity Securities Portfolio. The following table provides information regarding changes in the total allowance for credit losses for debt securities held to maturity during the three and nine months ended September 30, 2020.

TABLE 60: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO DEBT SECURITIES HELD TO MATURITY

	THREE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPERNATIONAL, AND NON-U.S. AGENCY BONDS		CERTIFICATE OF DEPOSITS		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	0.5	$	0.4	$	0.7	$	—	$	—	$	4.9	$	6.5
Provision for Credit Losses	0.2		—		(0.1)		0.2		0.1		—		0.4
Balance at End of Period	$	0.7	$	0.4	$	0.6	$	0.2	$	0.1	$	4.9	$	6.9

	NINE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPERNATIONAL, AND NON-U.S. AGENCY BONDS		CERTIFICATE OF DEPOSITS		COVERED BONDS		OTHER		TOTAL
Balance at End of Prior Period	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Cumulative Effect Adjustment	0.8		0.3		0.9		—		—		4.6		6.6
Balance at Beginning of Period	0.8		0.3		0.9		—		—		4.6		6.6
Provision for Credit Losses	(0.1)		0.1		(0.3)		0.2		0.1		0.3		0.3
Balance at End of Period	$	0.7	$	0.4	$	0.6	$	0.2	$	0.1	$	4.9	$	6.9

Prior to the adoption of ASU 2016-13, Northern Trust recognized $4.4 million of cumulative Other-Than-Temporary-Impairment (OTTI) losses on the debt securities classified as other as of December 31, 2019. For debt securities with previous OTTI losses recorded, Northern Trust applied ASU 2016-13 on a prospective basis whereby the amortized cost basis of the impaired security remains unchanged immediately before and after adopting ASU 2016-13. The allowance recorded at January 1, 2020 for debt securities held to maturity equals the difference between the calculated expected loss and the amount of OTTI loss previously recorded and represents the cumulative effect adjustment required upon the adoption of ASU 2016-13.

The increase to the allowance attributable to debt securities held to maturity for the three and nine months ended September 30, 2020 was primarily due to an increase in the reserve evaluated on a collective basis driven by current and projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts.

The allowance for credit losses for Northern Trust’s debt securities held to maturity portfolio is evaluated as follows:

•Debt securities held to maturity classified as U.S. government, government sponsored agency, and certain securities classified as obligations of states and political subdivisions are considered to be guarantees of the U.S. government or an agency of the U.S. government and therefore an allowance for credit losses is not estimated for such investments as the expected probability of non-payment of the amortized cost basis is zero.

•Debt securities held to maturity classified as other asset-backed represent pools of underlying receivables from which the cash flows are used to pay the bonds that vary in seniority. Utilizing a qualitative estimation approach, the allowance for other asset-backed securities is assessed by evaluating underlying pool performance based on delinquency rates and available credit support.

•Debt securities held to maturity classified as other relates to investments purchased by Northern Trust to fulfill its obligations under the Community Reinvestment Act (CRA). Northern Trust fulfills its obligations under the CRA by making qualified investments for purposes of supporting institutions and programs that benefit low-to-moderate income communities within Northern Trust’s market area. The allowance for CRA investments is assessed using a qualitative estimation approach primarily based on internal historical performance experience and default history of the underlying CRA portfolios to determine a quantitative component of the allowance.

The allowance estimation methodology for all other debt securities held to maturity is developed using a combination of external and internal data. The estimation methodology groups securities with shared characteristics for which the probability of default and the loss given default are applied to the total exposure at default to determine a quantitative component of the allowance.

69

Notes to Consolidated Financial Statements (unaudited) (continued)

Allowance for Other Financial Assets. The allowance for Other Financial Assets consists of the allowance for Cash and Due from Banks, Other Central Bank Deposits, Interest Bearing Deposits with Banks, Federal Funds Sold, and Other Assets. The Other Assets category includes other miscellaneous credit exposures reported in Other Assets on the consolidated balance sheets. The allowance estimation methodology for Other Financial Assets primarily utilizes a similar approach as used for the Debt Securities Held to Maturity portfolio. It consists of a combination of externally and internally developed loss data, adjusted for the appropriate contractual term. Northern Trust’s portfolio is composed mostly of institutions within the “1 to 3” internal borrower rating category and expected to exhibit minimal to modest likelihood of loss. The allowance for credit losses related to Other Financial Assets was $0.7 million as of September 30, 2020.

Note 8 – Pledged Assets

Certain of Northern Trust’s subsidiaries, as required or permitted by law, pledge assets to secure public and trust deposits, repurchase agreements and borrowings, as well as for other purposes, including support for securities settlement, primarily related to client activities, and for derivative contracts.

The following table presents Northern Trust's pledged assets.

TABLE 61: TYPE OF PLEDGED ASSETS

(In Billions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Securities
Obligations of States and Political Subdivisions	$	1.6	$	1.0
Government Sponsored Agency and Other Securities	30.0		33.4
Loans	11.8		7.7
Total Pledged Assets	$	43.4	$	42.1

Collateral required for these purposes totaled $7.6 billion and $8.5 billion at September 30, 2020 and December 31, 2019, respectively.

The following table presents the available for sale debt securities pledged as collateral that are included in pledged assets.

TABLE 62: FAIR VALUE OF AVAILABLE FOR SALE DEBT SECURITIES INCLUDED IN PLEDGED ASSETS

	SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE				DERIVATIVE CONTRACTS
(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019		SEPTEMBER 30, 2020		DECEMBER 31, 2019
Debt Securities
Available for Sale	$	268.6	$	487.1	$	30.0	$	14.4

The secured parties to these transactions have the right to repledge or sell the securities as it relates to $268.6 million and $487.2 million of the pledged collateral as of September 30, 2020 and December 31, 2019, respectively.

Northern Trust accepts financial assets as collateral that it is and is not permitted to repledge or sell. The collateral is generally obtained under certain reverse repurchase agreements and derivative contracts. The following table presents the fair value of securities accepted as collateral. There was no repledged or sold collateral at September 30, 2020 or December 31, 2019.

TABLE 63: ACCEPTED COLLATERAL

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Collateral that may be repledged or sold
Reverse repurchase agreements	$	1,533.4	$	707.8
Derivative contracts	30.6		16.8

Deposits maintained to meet Federal Reserve Bank reserve requirements averaged $0.5 billion for the nine months ended September 30, 2020. As a result of the economic environment arising from the COVID-19 pandemic, the Federal Reserve reduced the reserve requirement to zero percent on March 26, 2020. During 2019, deposits maintained to meet Federal Reserve Bank reserve requirements averaged $1.6 billion and $1.5 billion for the three and nine months ended September 30, 2019, respectively.

70

Notes to Consolidated Financial Statements (unaudited) (continued)

Note 9 – Goodwill and Other Intangibles

Goodwill. Changes by reporting segment in the carrying amount of goodwill for the nine months ended September 30, 2020, including the effect of foreign exchange rates on non-U.S.-dollar denominated balances, were as follows:

TABLE 64: GOODWILL BY REPORTING SEGMENT

(In Millions)	CORPORATE & INSTITUTIONAL SERVICES		WEALTH MANAGEMENT		TOTAL
Balance at December 31, 2019	$	625.7	$	71.1	$	696.8
Foreign Exchange Rates	1.2		—		1.2
Balance at September 30, 2020	$	626.9	$	71.1	$	698.0

Other Intangible Assets Subject to Amortization. The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of September 30, 2020 and December 31, 2019 were as follows:

TABLE 65: OTHER INTANGIBLE ASSETS

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Gross Carrying Amount	$	214.3	$	207.2
Less: Accumulated Amortization	101.7		86.6
Net Book Value	$	112.6	$	120.6

Other intangible assets consist primarily of the value of acquired client relationships and are included within Other Assets on the consolidated balance sheets. Amortization expense related to other intangible assets totaled $4.3 million and $12.6 million for the three and nine months ended September 30, 2020, and $4.2 million and $12.5 million for the three and nine months ended September 30, 2019. Amortization for the remainder of 2020 and for the years 2021, 2022, 2023, and 2024 is estimated to be $4.3 million, $14.7 million, $10.1 million, $9.8 million, and $9.7 million, respectively.

Note 10 – Reporting Segments

Northern Trust is organized around its two client-focused reporting segments: Corporate & Institutional Services (C&IS) and Wealth Management. Asset management and related services are provided to C&IS and Wealth Management clients primarily by the Asset Management business. The revenue and expenses of Asset Management and certain other support functions are allocated fully to C&IS and Wealth Management.

Reporting segment financial information, presented on an internal management-reporting basis, is determined by accounting systems used to allocate revenue and expense to each segment, and incorporates processes for allocating assets, liabilities, equity and the applicable interest income and expense utilizing a funds transfer pricing (FTP) methodology. Under the methodology, assets and liabilities receive a funding charge or credit that considers interest rate risk, liquidity risk, and other product characteristics on an instrument level.

Revenues, expenses and average assets are allocated to C&IS and Wealth Management, with the exception of non-recurring activities such as certain costs associated with acquisitions, divestitures, litigation, restructuring, and tax adjustments not directly attributable to a specific reporting segment.

Reporting segment results are subject to reclassification when organizational changes are made. The results are also subject to refinements in revenue and expense allocation methodologies, which are typically reflected on a prospective basis.

71

Notes to Consolidated Financial Statements (unaudited) (continued)

The following table reflects the earnings contributions and average assets of Northern Trust’s reporting segments for the three- and nine- month periods ended September 30, 2020 and 2019.

TABLE 66: RESULTS OF REPORTING SEGMENTS

($ In Millions)	CORPORATE & INSTITUTIONAL SERVICES						WEALTH MANAGEMENT						TREASURY AND OTHER						TOTAL CONSOLIDATED
THREE MONTHS ENDED SEPTEMBER 30,	2020			2019			2020			2019			2020			2019			2020			2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$	584.9		$	559.9		$	418.9		$	415.6		$	—		$	—		$	1,003.8		$	975.5
Foreign Exchange Trading Income	58.4			55.5			3.2			4.2			—			—			61.6			59.7
Other Noninterest Income	56.7			53.6			39.7			38.1			(5.3)			(6.7)			91.1			85.0
Total Noninterest Income	700.0			669.0			461.8			457.9			(5.3)			(6.7)			1,156.5			1,120.2
Net Interest Income(1)	139.9			229.9			196.6			195.4			—			—			336.5			425.3
Revenue(1)	839.9			898.9			658.4			653.3			(5.3)			(6.7)			1,493.0			1,545.5
Provision for Credit Losses	(19.2)			4.8			19.7			(11.8)			—			—			0.5			(7.0)
Noninterest Expense	707.3			649.2			386.3			385.9			1.1			1.2			1,094.7			1,036.3
Income before Income Taxes(1)	151.8			244.9			252.4			279.2			(6.4)			(7.9)			397.8			516.2
Provision for Income Taxes(1)	38.7			59.9			66.2			73.6			(1.6)			(1.9)			103.3			131.6
Net Income	$	113.1		$	185.0		$	186.2		$	205.6		$	(4.8)		$	(6.0)		$	294.5		$	384.6
Percentage of Consolidated Net Income	39		%	48		%	63		%	54		%	(2)		%	(2)		%	100		%	100		%
Average Assets	$	108,823.0		$	85,982.2		$	32,102.4		$	30,369.9		$	—		$	—		$	140,925.4		$	116,352.1

⁽¹⁾    Non-GAAP financial measures stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $7.9 million for 2020 and $7.6 million for 2019.

($ In Millions)	CORPORATE & INSTITUTIONAL SERVICES						WEALTH MANAGEMENT						TREASURY AND OTHER						TOTAL CONSOLIDATED
NINE MONTHS ENDED SEPTEMBER 30,	2020			2019			2020			2019			2020			2019			2020			2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,725.5		$	1,644.5		$	1,243.4		$	1,215.4		$	—		$	—		$	2,968.9		$	2,859.9
Foreign Exchange Trading Income	211.8			172.5			10.0			13.9			—			—			221.8			186.4
Other Noninterest Income	167.5			141.8			122.9			95.1			(11.0)			(14.9)			279.4			222.0
Total Noninterest Income	2,104.8			1,958.8			1,376.3			1,324.4			(11.0)			(14.9)			3,470.1			3,268.3
Net Interest Income(1)	516.6			694.3			615.9			585.9			—			—			1,132.5			1,280.2
Revenue(1)	2,621.4			2,653.1			1,992.2			1,910.3			(11.0)			(14.9)			4,602.6			4,548.5
Provision for Credit Losses	35.3			1.3			92.2			(14.8)			—			—			127.5			(13.5)
Noninterest Expense	2,022.2			1,930.5			1,152.7			1,137.9			22.3			2.8			3,197.2			3,071.2
Income before Income Taxes(1)	563.9			721.3			747.3			787.2			(33.3)			(17.7)			1,277.9			1,490.8
Provision for Income Taxes(1)	129.9			171.8			187.9			202.3			(8.3)			(4.4)			309.5			369.7
Net Income	$	434.0		$	549.5		$	559.4		$	584.9		$	(25.0)		$	(13.3)		$	968.4		$	1,121.1
Percentage of Consolidated Net Income	45		%	49		%	58		%	52		%	(3)		%	(1)		%	100		%	100		%
Average Assets	$	102,902.3		$	87,664.1		$	31,742.9		$	29,700.6		$	—		$	—		$	134,645.2		$	117,364.7

⁽¹⁾    Non-GAAP financial measures stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $23.7 million for 2020 and $23.1 million for 2019.

Note 11 – Stockholders’ Equity

Preferred Stock. The Corporation is authorized to issue 10 million shares of preferred stock without par value. The Board of Directors is authorized to fix the particular designations, preferences and relative, participating, optional and other special rights and qualifications, limitations or restrictions for each series of preferred stock issued.

As of September 30, 2020, 5,000 shares of Series D Non-Cumulative Perpetual Preferred Stock (the “Series D Preferred Stock”) and 16,000 shares of Series E Non-Cumulative Perpetual Preferred Stock (“Series E Preferred Stock”) were outstanding.

Series D Preferred Stock. As of September 30, 2020, the Corporation had issued and outstanding 500,000 depositary shares, each representing a 1/100th ownership interest in a share of Series D Preferred Stock, issued in August 2016. Equity related to Series D Preferred Stock as of September 30, 2020 and December 31, 2019 was $493.5 million. Shares of the Series D Preferred Stock have no par value and a liquidation preference of $100,000 (equivalent to $1,000 per depositary share).

72

Notes to Consolidated Financial Statements (unaudited) (continued)

Dividends on the Series D Preferred Stock, which are not mandatory, accrue and are payable on the liquidation preference amount, on a non-cumulative basis, at a rate per annum equal to (i) 4.60% from the original issue date of the Series D Preferred Stock to but excluding October 1, 2026; and (ii) a floating rate equal to Three-Month LIBOR plus 3.202% from and including October 1, 2026. Fixed rate dividends are payable in arrears on the first day of April and October of each year, through and including October 1, 2026, and floating rate dividends will be payable in arrears on the first day of January, April, July and October of each year, commencing on January 1, 2027. On July 21, 2020, the Corporation declared a cash dividend of $2,300 per share of Series D Preferred Stock payable on October 1, 2020, to stockholders of record as of September 15, 2020.

Series E Preferred Stock. As of September 30, 2020, the Corporation had issued and outstanding 16 million depositary shares, each representing 1/1,000th ownership interest in a share of Series E Preferred Stock, issued in November 2019. Equity related to Series E Preferred Stock as of September 30, 2020 and December 31, 2019 was $391.4 million. Shares of the Series E Preferred Stock have no par value and a liquidation preference of $25,000 (equivalent to $25 per depositary share).

Dividends on the Series E Preferred Stock, which are not mandatory, will accrue and be payable on the liquidation preference amount, on a non-cumulative basis, quarterly in arrears on the first day of January, April, July and October of each year, commencing on April 1, 2020, at a rate per annum equal to 4.70%. On July 21, 2020, the Corporation declared a cash dividend of $293.75 per share of Series E Preferred Stock payable on October 1, 2020, to stockholders of record as of September 15, 2020.

Common Stock. As the Corporation suspended its open-market share repurchase program on March 16, 2020, the only shares repurchased during the three months ended September 30, 2020 were 18,534 shares of common stock withheld upon the vesting of share-based compensation at a total cost of $1.5 million ($81.02 average price per share) to satisfy tax withholding obligations. During the nine months ended September 30, 2020, the Corporation repurchased 3,262,621 shares of common stock, including 518,745 shares withheld related to share-based compensation, at a total cost of $298.5 million ($91.49 average price per share). The Corporation’s current stock repurchase authorization to repurchase up to 25.0 million shares was approved by the Board of Directors in July 2018. Shares are repurchased by the Corporation to, among other things, manage the Corporation’s capital levels. Repurchased shares are used for general purposes, including the issuance of shares under stock option and other incentive plans. The repurchase authorization approved by the Board of Directors has no expiration date.

During the second quarter of 2020, the Federal Reserve announced certain measures to ensure that large financial institutions, including Northern Trust, remain resilient despite the economic uncertainty resulting from the ongoing COVID-19 pandemic. Specifically, for the third quarter of 2020, no share repurchases were permitted by these institutions and dividend payments were limited to the amount paid in the second quarter and could not exceed the payor’s average net income for the four preceding quarters. On September 30, 2020, the Federal Reserve announced that these measures have been extended to apply to the fourth quarter of 2020 as well.

73

Notes to Consolidated Financial Statements (unaudited) (continued)

Note 12 – Accumulated Other Comprehensive Income (Loss)

The following tables summarize the components of accumulated other comprehensive income (loss) (AOCI) at September 30, 2020 and 2019, and changes during the three and nine months then ended.

TABLE 67: SUMMARY OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

	THREE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at June 30, 2020	$	631.8	$	0.3	$	145.5	$	(407.2)	$	370.4
Net Change	33.5		1.3		1.8		17.5		54.1
Balance at September 30, 2020	$	665.3	$	1.6	$	147.3	$	(389.7)	$	424.5

⁽¹⁾ Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2020.

	NINE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at December 31, 2019	$	114.0	$	(3.7)	$	117.8	$	(422.8)	$	(194.7)
Net Change	551.3		5.3		29.5		33.1		619.2
Balance at September 30, 2020	$	665.3	$	1.6	$	147.3	$	(389.7)	$	424.5

⁽¹⁾ Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2020.

	THREE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at June 30, 2019	$	133.1	$	4.5	$	96.8	$	(394.2)	$	(159.8)
Net Change	57.0		(2.4)		9.9		4.3		68.8
Balance at September 30, 2019	$	190.1	$	2.1	$	106.7	$	(389.9)	$	(91.0)

⁽¹⁾    Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2019.

	NINE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at December 31, 2018	$	(114.9)	$	4.0	$	67.9	$	(410.7)	$	(453.7)
Net Change	305.0		(1.9)		38.8		20.8		362.7
Balance at September 30, 2019	$	190.1	$	2.1	$	106.7	$	(389.9)	$	(91.0)

⁽¹⁾    Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2019.

74

Notes to Consolidated Financial Statements (unaudited) (continued)

TABLE 68: DETAILS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

	THREE MONTHS ENDED SEPTEMBER 30,
	2020						2019
(In Millions)	BEFORE TAX		TAX EFFECT		AFTER TAX		BEFORE TAX		TAX EFFECT		AFTER TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale
Unrealized Gains (Losses) on Debt Securities Available for Sale	$	45.3	$	(11.8)	$	33.5	$	76.1	$	(19.4)	$	56.7
Reclassification Adjustment for (Gains) Losses Included in Net Income(1)	—		—		—		0.3		—		0.3
Net Change	$	45.3	$	(11.8)	$	33.5	$	76.4	$	(19.4)	$	57.0
Unrealized Gains (Losses) on Cash Flow Hedges
Foreign Exchange Contracts	$	6.6	$	(1.6)	$	5.0	$	0.7	$	(0.2)	$	0.5
Interest Rate Contracts	(0.2)		—		(0.2)		0.1		—		0.1
Reclassification Adjustment for (Gains) Losses Included in Net Income(2)	(4.7)		1.2		(3.5)		(4.0)		1.0		(3.0)
Net Change	$	1.7	$	(0.4)	$	1.3	$	(3.2)	$	0.8	$	(2.4)
Foreign Currency Adjustments
Foreign Currency Translation Adjustments	$	92.1	$	(3.1)	$	89.0	$	(71.9)	$	2.0	$	(69.9)
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)	1.2		(0.3)		0.9		(1.3)		0.3		(1.0)
Net Investment Hedge Gains (Losses)	(117.4)		29.3		(88.1)		107.6		(26.8)		80.8
Net Change	$	(24.1)	$	25.9	$	1.8	$	34.4	$	(24.5)	$	9.9
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gains	$	12.6	$	(3.1)	$	9.5	$	—	$	—	$	—
Reclassification Adjustment for (Gains) Losses Included in Net Income(3)
Amortization of Net Actuarial Loss	10.7		(2.6)		8.1		5.7		(1.3)		4.4
Amortization of Prior Service Cost	(0.1)		—		(0.1)		(0.1)		—		(0.1)
Net Change	$	23.2	$	(5.7)	$	17.5	$	5.6	$	(1.3)	$	4.3
Total Net Change	$	46.1	$	8.0	$	54.1	$	113.2	$	(44.4)	$	68.8

See table footnotes under the YTD table.

	NINE MONTHS ENDED SEPTEMBER 30,
	2020						2019
(In Millions)	BEFORE TAX		TAX EFFECT		AFTER TAX		BEFORE TAX		TAX EFFECT		AFTER TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale
Unrealized Gains (Losses) on Debt Securities Available for Sale	$	736.8	$	(185.4)	$	551.4	$	409.0	$	(104.6)	$	304.4
Reclassification Adjustment for (Gains) Losses Included in Net Income(1)	(0.1)		—		(0.1)		0.6		—		0.6
Net Change	$	736.7	$	(185.4)	$	551.3	$	409.6	$	(104.6)	$	305.0
Unrealized Gains (Losses) on Cash Flow Hedges
Foreign Exchange Contracts	$	18.1	$	(4.5)	$	13.6	$	17.4	$	(4.3)	$	13.1
Interest Rate Contracts	0.2		(0.1)		0.1		1.4		(0.3)		1.1
Reclassification Adjustment for (Gains) Losses Included in Net Income(2)	(11.2)		2.8		(8.4)		(21.4)		5.3		(16.1)
Net Change	$	7.1	$	(1.8)	$	5.3	$	(2.6)	$	0.7	$	(1.9)
Foreign Currency Adjustments
Foreign Currency Translation Adjustments	$	53.1	$	(1.0)	$	52.1	$	(69.4)	$	3.3	$	(66.1)
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)	0.7		(0.2)		0.5		(1.3)		0.3		(1.0)
Net Investment Hedge Gains (Losses)	(29.8)		6.7		(23.1)		144.1		(38.2)		105.9
Net Change	$	24.0	$	5.5	$	29.5	$	73.4	$	(34.6)	$	38.8
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gains (Losses)	$	11.8	$	(3.0)	$	8.8	$	11.4	$	(3.1)	$	8.3
Reclassification Adjustment for (Gains) Losses Included in Net Income(3)
Amortization of Net Actuarial Loss	$	32.3	$	(7.8)	$	24.5	$	16.8	$	(4.1)	$	12.7
Amortization of Prior Service Cost	(0.2)		—		(0.2)		(0.2)		—		(0.2)
Net Change	$	43.9	$	(10.8)	$	33.1	$	28.0	$	(7.2)	$	20.8
Total Net Change	$	811.7	$	(192.5)	$	619.2	$	508.4	$	(145.7)	$	362.7

⁽¹⁾ The before-tax reclassification adjustment out of AOCI related to the realized gains (losses) on debt securities available for sale is recorded as Investment Security Gains (Losses), net within the consolidated statements of income.

⁽²⁾ See Note 20 — Derivative Financial Instruments for the location of the reclassification adjustment related to cash flow hedges.

⁽³⁾ The before-tax reclassification adjustment out of AOCI related to pension and other postretirement benefit adjustments is recorded in Employee Benefits expense within the consolidated statements of income.

75

Notes to Consolidated Financial Statements (unaudited) (continued)

Note 13 – Net Income Per Common Share Computations

The computations of net income per common share are presented in the following table.

TABLE 69: NET INCOME PER COMMON SHARE

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
($ In Millions Except Per Common Share Information)	2020		2019		2020		2019
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding	208,106,190		213,176,809		208,351,088		215,832,347
Net Income	$	294.5	$	384.6	$	968.4	$	1,121.1
Less: Dividends on Preferred Stock	16.2		17.4		51.5		40.6
Net Income Applicable to Common Stock	278.3		367.2		916.9		1,080.5
Less: Earnings Allocated to Participating Securities	3.3		4.5		10.6		12.6
Earnings Allocated to Common Shares Outstanding	275.0		362.7		906.3		1,067.9
Basic Net Income Per Common Share	$	1.32	$	1.70	$	4.35	$	4.95
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding	208,106,190		213,176,809		208,351,088		215,832,347
Plus: Dilutive Effect of Share-based Compensation	582,304		1,029,767		672,243		1,031,216
Average Common and Potential Common Shares	208,688,494		214,206,576		209,023,331		216,863,563
Earnings Allocated to Common and Potential Common Shares	$	275.0	$	362.7	$	906.3	$	1,067.9
Diluted Net Income Per Common Share	1.32		1.69		4.34		4.92

Note:    For the three and nine months ended September 30, 2020 and 2019, there were no common stock equivalents excluded in the computation of diluted net income per share.

Note 14 – Revenue from Contracts with Clients

Trust, Investment, and Other Servicing Fees. Custody and fund administration income is comprised of revenues received from our core asset servicing business for providing custody, fund administration, and middle-office-related services, primarily to C&IS clients. Investment management and advisory income contains revenue received from providing asset management and related services to Wealth Management and C&IS clients and to Northern Trust sponsored funds. Securities lending income represents revenues generated from securities lending arrangements that Northern Trust enters into as agent, mainly with C&IS clients. Other income largely consists of revenues received from providing employee benefit, investment risk and analytic and other services to C&IS and Wealth Management clients.

Other Noninterest Income. Treasury management income represents revenues received from providing cash and liquidity management services to C&IS and Wealth Management clients. The portion of securities commissions and trading income that relates to revenue from contracts with clients is primarily comprised of commissions earned from providing securities brokerage services to Wealth Management and C&IS clients. The portion of other operating income that relates to revenue from contracts with clients is mainly comprised of service fees for banking-related services provided to Wealth Management and C&IS clients.

Performance Obligations. Clients are typically charged monthly or quarterly in arrears based on the fee arrangement agreed to with each client; payment terms will vary depending on the client and services offered.

Substantially all revenues generated from contracts with clients for asset servicing, asset management, securities lending, treasury management and banking-related services are recognized on an accrual basis, over the period in which services are provided. The nature of Northern Trust’s performance obligations is to provide a series of distinct services in which the customer simultaneously receives and consumes the benefits of the promised services as they are performed. Fee arrangements are mainly comprised of variable amounts based on market value of client assets managed and serviced, transaction volumes, number of accounts, and securities lending volume and spreads. Revenue is recognized using the output method in an amount that reflects the consideration to which Northern Trust expects to be entitled in exchange for providing each month or quarter of service. For contracts with multiple performance obligations, revenue is allocated to each performance obligation based on the price agreed to with the client, representing its relative standalone selling price.

Security brokerage revenue is primarily represented by securities commissions received in exchange of providing trade execution related services. Control is transferred at a point in time, on the trade date of the transaction, and fees are typically variable based on transaction volumes and security types.

76

Notes to Consolidated Financial Statements (unaudited) (continued)

Northern Trust’s contracts with its clients are typically open-ended arrangements and are therefore considered to have an original duration of less than one year. Northern Trust has elected the practical expedient to not disclose the value of remaining performance obligations for contracts with an original expected duration of one year or less.

The following table presents revenues disaggregated by major revenue source.

TABLE 70: REVENUE DISAGGREGATION

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Noninterest Income
Trust, Investment and Other Servicing Fees
Custody and Fund Administration	$	416.4	$	414.8	$	1,231.7	$	1,219.7
Investment Management and Advisory	519.3		491.4		1,515.2		1,428.7
Securities Lending	19.8		20.1		70.7		64.9
Other	48.3		49.2		151.3		146.6
Total Trust, Investment and Other Servicing Fees	$	1,003.8	$	975.5	$	2,968.9	$	2,859.9
Other Noninterest Income
Foreign Exchange Trading Income	$	61.6	$	59.7	$	221.8	$	186.4
Treasury Management Fees	11.6		11.2		34.0		34.1
Security Commissions and Trading Income	26.0		29.1		100.9		75.8
Other Operating Income	53.5		45.1		144.4		113.0
Investment Security Gains (Losses), net	—		(0.4)		0.1		(0.9)
Total Other Noninterest Income	$	152.7	$	144.7	$	501.2	$	408.4
Total Noninterest Income	$	1,156.5	$	1,120.2	$	3,470.1	$	3,268.3

On the consolidated statements of income, Trust, Investment and Other Servicing Fees and Treasury Management Fees represent revenue from contracts with clients. For the three months ended September 30, 2020, revenue from contracts with clients also includes $21.8 million of the $26.0 million total Security Commissions and Trading Income and $10.8 million of the $53.5 million total Other Operating Income. For the nine months ended September 30, 2020, revenue from contracts with clients also included $76.9 million of the $100.9 million total Security Commissions and Trading Income and $31.6 million of the $144.4 million total Other Operating Income.

For the three months ended September 30, 2019, revenue from contracts with clients also includes $23.5 million of the $29.1 million total Security Commissions and Trading Income and $10.5 million of the $45.1 million total Other Operating Income. For the nine months ended September 30, 2019, revenue from contracts with clients also included $64.3 million of the $75.8 million total Security Commissions and Trading Income and $30.9 million of the $113.0 million total Other Operating Income.

Receivables Balances. The table below represents receivables balances from contracts with clients, which are included in Other Assets on the consolidated balance sheets, at September 30, 2020 and December 31, 2019.

TABLE 71: CLIENT RECEIVABLES

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Trust Fees Receivable, net(1)	$	805.7	$	801.9
Other	113.2		101.1
Total Client Receivables	$	918.9	$	903.0

⁽¹⁾ Trust Fees Receivable is net of a $7.3 million and $5.6 million fee receivable allowance as of September 30, 2020 and December 31, 2019, respectively.

77

Notes to Consolidated Financial Statements (unaudited) (continued)

Note 15 – Net Interest Income

The components of net interest income were as follows:

TABLE 72: NET INTEREST INCOME

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Interest Income
Loans and Leases	$	167.1	$	291.0	$	606.4	$	889.8
Securities — Taxable	182.6		265.9		632.1		812.4
— Non-Taxable	0.3		0.9		1.1		3.1
Interest-Bearing Due from and Deposits with Banks(1)	2.7		18.6		20.0		55.7
Federal Reserve and Other Central Bank Deposits and Other	2.7		44.4		31.3		162.8
Total Interest Income	$	355.4	$	620.8	$	1,290.9	$	1,923.8
Interest Expense
Deposits	$	(3.5)	$	122.0	$	56.7	$	403.5
Federal Funds Purchased	0.1		2.4		2.1		22.8
Securities Sold Under Agreements to Repurchase	—		1.6		1.0		5.4
Other Borrowings	5.0		46.0		40.6		145.2
Senior Notes	19.1		19.6		57.0		54.0
Long-Term Debt	5.7		9.4		21.1		29.4
Floating Rate Capital Debt	0.4		2.1		3.6		6.4
Total Interest Expense	$	26.8	$	203.1	$	182.1	$	666.7
Net Interest Income	$	328.6	$	417.7	$	1,108.8	$	1,257.1

⁽¹⁾    Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

78

Notes to Consolidated Financial Statements (unaudited) (continued)

Note 16 – Pension and Postretirement Health Care

The following table sets forth the net periodic pension and postretirement benefit expense for Northern Trust’s U.S. Qualified Plan, Non-U.S. Pension Plans, U.S. Non-Qualified Plan, and postretirement health care plan for the three and nine months ended September 30, 2020 and 2019.

TABLE 73: NET PERIODIC PENSION EXPENSE (BENEFIT)

U.S. QUALIFIED PLAN	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Service Cost	$	11.9	$	10.4	$	35.5	$	31.2
Interest Cost	10.8		11.8		32.4		35.4
Expected Return on Plan Assets	(19.2)		(21.7)		(57.6)		(65.1)
Amortization
Net Actuarial Loss	8.8		4.3		26.4		12.9
Prior Service Cost	(0.1)		(0.1)		(0.3)		(0.3)
Net Periodic Pension Expense	$	12.2	$	4.7	$	36.4	$	14.1

NON-U.S. PENSION PLANS	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Service Cost	$	0.6	$	0.5	$	1.6	$	1.5
Interest Cost	0.7		0.9		2.1		2.9
Expected Return on Plan Assets	(0.8)		(1.0)		(2.3)		(2.9)
Settlement Expense	0.1		—		0.3		—
Amortization
Net Actuarial Loss	0.2		0.2		0.8		0.5
Prior Service Cost	0.1		—		0.1		—
Net Periodic Pension Expense	$	0.9	$	0.6	$	2.6	$	2.0

U.S. NON-QUALIFIED PLAN	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Service Cost	$	1.2	$	1.1	$	3.4	$	3.1
Interest Cost	1.2		1.5		3.6		4.4
Amortization
Net Actuarial Loss	1.7		1.4		5.3		4.2
Prior Service Cost	—		—		0.1		0.1
Net Periodic Pension Expense	$	4.1	$	4.0	$	12.4	$	11.8

POSTRETIREMENT HEALTH CARE PLAN	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Interest Cost	$	0.2	$	0.3	$	0.6	$	0.9
Amortization
Net Actuarial (Gain)	(0.1)		(0.2)		(0.5)		(0.8)
Prior Service Cost	(0.1)		—		(0.1)		—
Net Periodic Postretirement Expense	$	—	$	0.1	$	—	$	0.1

Northern Trust expects to change the plan design of its post-retirement health care plan as of January 1, 2021, which results in the recognition of negative prior-service cost at the time these changes were communicated to participants in August 2020. Concurrently, a further shift in population from active to inactive participants required an adjustment to the amortization period from the average remaining service period of active participants to the average life expectancy of the inactive participants. The change in plan design and amortization period results in a decrease of the benefit obligation and 2020 benefit expense by $12.6 million and $0.3 million, respectively.

The components of net periodic pension expense are recorded in Employee Benefits expense within the consolidated statements of income.

There were no contributions to the U.S. Qualified Plan during the nine months ended September 30, 2020 and 2019, respectively.

79

Notes to Consolidated Financial Statements (unaudited) (continued)

Note 17 – Share-Based Compensation Plans

The Northern Trust Corporation 2017 Long-Term Incentive Plan provides for the grant of non-qualified and incentive stock options; tandem and free-standing stock appreciation rights; stock awards in the form of restricted stock, restricted stock units and other stock awards; and performance awards.

Beginning with the grants made on February 21, 2017 under the Corporation’s prior equity incentive plan, restricted stock unit and performance stock unit grants continue to vest in accordance with the original terms of the award if the applicable employee retires after satisfying applicable age and service requirements. For all applicable periods, stock option grants continue to vest in accordance with the original terms of the award if the employee meets applicable age and service requirements upon separation from service.

Total compensation expense for share-based payment arrangements and the associated tax impacts were as follows for the three and nine months ended September 30, 2020 and 2019.

TABLE 74: TOTAL COMPENSATION EXPENSE FOR SHARE-BASED PAYMENT ARRANGEMENTS

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Restricted Stock Unit Awards	$	12.2	$	14.0	$	66.3	$	68.5
Stock Options	0.1		0.4		0.4		1.1
Performance Stock Units	1.6		2.9		16.1		21.7
Total Share-Based Compensation Expense	13.9		17.3		82.8		91.3
Tax Benefits Recognized	$	3.5	$	4.3	$	20.6	$	22.7

Note 18 – Variable Interest Entities

Variable Interest Entities (VIEs) are defined within GAAP as entities which either have a total equity investment that is insufficient to permit the entity to finance its activities without additional subordinated financial support or whose equity investors lack the characteristics of a controlling financial interest. Investors that finance a VIE through debt or equity interests, or other counterparties that provide other forms of support, such as guarantees, subordinated fee arrangements, or certain types of derivative contracts, are variable interest holders in the entity and the variable interest holder, if any, that has both the power to direct the activities that most significantly impact the entity and a variable interest that could potentially be significant to the entity is deemed to be the VIE’s primary beneficiary and is required to consolidate the VIE.

Leveraged Leases. In leveraged leasing transactions, Northern Trust acts as lessor of the underlying asset subject to the lease and typically funds 20 - 30% of the asset’s cost via an equity ownership in a trust with the remaining 70 - 80% provided by third-party non-recourse debt holders. In such transactions, the trusts, which are VIEs, are created to provide the lessee use of the property with substantially all of the rights and obligations of ownership. The lessee’s maintenance and operation of the leased property has a direct effect on the fair value of the underlying property, and the lessee also has the ability to increase the benefits it can receive and limit the losses it can suffer by the manner in which it uses the property. As a result, Northern Trust has determined that it is not the primary beneficiary of the leveraged lease trust VIEs given it lacks the power to direct the activities that most significantly impact the economic performance of the leveraged lease trust VIEs.

Northern Trust’s maximum exposure to loss as a result of its involvement with leveraged lease trust VIEs is limited to the carrying amounts of its leveraged lease investments. The carrying amounts of these investments, which are included in Loans and Leases on the consolidated balance sheets, were $30.1 million and $42.6 million as of September 30, 2020 and December 31, 2019, respectively. Northern Trust’s funding requirements relative to the leveraged lease trust VIEs are limited to its invested capital. Northern Trust has no other liquidity arrangements or obligations to purchase assets of the leveraged lease trust VIEs that would expose Northern Trust to a loss.

Tax Credit Structures. Northern Trust invests in qualified affordable housing projects and community development entities (collectively, community development projects) that are designed to generate a return primarily through the realization of tax credits. The community development projects are formed as limited partnerships and limited liability companies in which Northern Trust invests as a limited partner/investor member through equity contributions. The economic performance of the community development projects, some of which are VIEs, is subject to the performance of their underlying investment and their ability to operate in compliance with the rules and regulations necessary for the qualification of tax credits generated by equity investments. Northern Trust has determined that it is not the primary beneficiary of any community development project VIEs as it lacks the power to direct the activities that most significantly impact the economic performance of the underlying investments or to affect their ability to operate in compliance with the rules and regulations necessary for the qualification of

80

Notes to Consolidated Financial Statements (unaudited) (continued)

tax credits generated by equity investments. This power is held by the general partners and managing members who exercise full and exclusive control of the operations of the community development project VIEs.

Northern Trust’s maximum exposure to loss as a result of its involvement with community development projects is limited to the carrying amounts of its investments, including any undrawn commitments. As of September 30, 2020 and December 31, 2019, the carrying amounts of these investments in community development projects that generate tax credits, included in Other Assets on the consolidated balance sheets, totaled $761.3 million and $749.3 million, respectively, of which $715.5 million and $700.3 million are VIEs as of September 30, 2020 and December 31, 2019, respectively. As of September 30, 2020 and December 31, 2019, liabilities related to unfunded commitments on investments in tax credit community development projects, included in Other Liabilities on the consolidated balance sheets, totaled $300.0 million and $376.2 million, respectively, of which $283.5 million and $354.3 million related to undrawn commitments on VIEs as of September 30, 2020 and December 31, 2019, respectively. Northern Trust’s funding requirements are limited to its invested capital and undrawn commitments for future equity contributions. Northern Trust has no exposure to loss from liquidity arrangements and no obligation to purchase assets of the community development projects.

Tax credits and other tax benefits attributable to community development projects totaled $20.7 million and $16.4 million for the three months ended September 30, 2020 and 2019, respectively, and $59.4 million and $49.2 million for the nine months ended September 30, 2020 and 2019, respectively.

Investment Funds. Northern Trust acts as asset manager for various funds in which clients of Northern Trust are investors. As an asset manager of funds, Northern Trust earns a competitively priced fee that is based on assets managed and varies with each fund’s investment objective. Based on its analysis, Northern Trust has determined that it is not the primary beneficiary of these VIEs under GAAP.

Some of the funds for which Northern Trust acts as asset manager comply or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds and therefore the funds are exempt from the consolidation requirements in ASC 810-10. Northern Trust voluntarily waived $5.4 million and $5.7 million of money market mutual fund fees for the three and nine months ended September 30, 2020, respectively. Northern Trust did not waive any money market mutual fund fees for the three and nine months ended September 30, 2019. Northern Trust does not have any contractual obligations to provide financial support to the funds. Any potential future support of the funds will be at the discretion of Northern Trust after an evaluation of the specific facts and circumstances.

Periodically, Northern Trust makes seed capital investments to certain funds. As of September 30, 2020, Northern Trust had $1.7 million of investments valued using net asset value per share and included in Other Assets and had $73.3 million in unfunded commitments related to seed capital investments. As of December 31, 2019, Northern Trust had $112.0 million of investments valued using net asset value per share and included in Other Assets and had no unfunded commitments related to seed capital investments.

Note 19 – Commitments and Contingent Liabilities

Commitments, Letters of Credit and Indemnifications. Northern Trust, in the normal course of business, enters into various types of commitments and issues letters of credit to meet the liquidity and credit enhancement needs of its clients.

Legally binding commitments to extend credit generally have fixed expiration dates or other termination clauses. Since a significant portion of the commitments are expected to expire without being drawn upon, the total commitment amount does not necessarily represent future loans or liquidity requirements. Legally binding commitments to extend credit totaled $26.4 billion and $24.4 billion as of September 30, 2020 and December 31, 2019, respectively.

Standby letters of credit obligate Northern Trust to meet certain financial obligations of its clients, if, under the contractual terms of the agreement, the clients are unable to do so. These instruments are primarily issued to support public and private financial commitments, including commercial paper, bond financing, initial margin requirements on futures exchanges and similar transactions. Northern Trust is obligated to meet the entire financial obligation of these agreements and in certain cases is able to recover the amounts paid through recourse against collateral received or other participants. Standby letters of credit outstanding and financial guarantees were $2.1 billion and $2.4 billion as of September 30, 2020 and December 31, 2019, respectively. Financial guarantees are issued by Northern Trust to guarantee the performance of a client to a third party under certain arrangements.

As part of its securities custody activities and at the direction of its clients, Northern Trust lends securities owned by clients to borrowers who are reviewed and approved by the Northern Trust Capital Markets Credit Committee. In connection with these activities, Northern Trust has issued indemnifications to certain clients against certain losses that are a direct result of a borrower’s failure to return securities when due, should the value of such securities exceed the value of the collateral required to

81

Notes to Consolidated Financial Statements (unaudited) (continued)

be posted. Borrowers are required to collateralize fully securities received with cash or marketable securities. As securities are loaned, collateral is maintained at a minimum of 100% of the fair value of the securities plus accrued interest. The collateral is revalued on a daily basis. The amount of securities loaned as of September 30, 2020 and December 31, 2019 subject to indemnification was $148.3 billion and $138.1 billion, respectively. Because of the credit quality of the borrowers and the requirement to fully collateralize securities borrowed, management believes that the exposure to credit loss from this activity is not significant and no liability was recorded as of September 30, 2020 or December 31, 2019, related to these indemnifications.

Legal Proceedings. In the normal course of business, the Corporation and its subsidiaries are routinely defendants in or parties to pending and threatened legal actions, and are subject to regulatory examinations, information-gathering requests, investigations, and proceedings, both formal and informal. In certain legal actions, claims for substantial monetary damages are asserted. In regulatory matters, claims for disgorgement, restitution, penalties and/or other remedial actions or sanctions may be sought.

Based on current knowledge, after consultation with legal counsel and after taking into account current accruals, management does not believe that losses, fines or penalties, if any, arising from pending litigation or threatened legal actions or regulatory matters either individually or in the aggregate, after giving effect to applicable reserves and insurance coverage will have a material adverse effect on the consolidated financial position or liquidity of the Corporation, although such matters could have a material adverse effect on the Corporation’s operating results for a particular period.

Under GAAP, (i) an event is “probable” if the “future event or events are likely to occur”; (ii) an event is “reasonably possible” if “the chance of the future event or events occurring is more than remote but less than likely”; and (iii) an event is “remote” if “the chance of the future event or events occurring is slight.”

The outcome of litigation and regulatory matters is inherently difficult to predict and/or the range of loss often cannot be reasonably estimated, particularly for matters that (i) will be decided by a jury, (ii) are in early stages, (iii) involve uncertainty as to the likelihood of a class being certified or the ultimate size of the class, (iv) are subject to appeals or motions, (v) involve significant factual issues to be resolved, including with respect to the amount of damages, (vi) do not specify the amount of damages sought or (vii) seek very large damages based on novel and complex damage and liability legal theories. Accordingly, the Corporation cannot reasonably estimate the eventual outcome of these pending matters, the timing of their ultimate resolution or what the eventual loss, fines or penalties, if any, related to each pending matter will be.

In accordance with applicable accounting guidance, the Corporation records accruals for litigation and regulatory matters when those matters present loss contingencies that are both probable and reasonably estimable. When loss contingencies are not both probable and reasonably estimable, the Corporation does not record accruals. No material accruals have been recorded for pending litigation or threatened legal actions or regulatory matters.

For a limited number of matters for which a loss is reasonably possible in future periods, whether in excess of an accrued liability or where there is no accrued liability, the Corporation is able to estimate a range of possible loss. As of September 30, 2020, the Corporation has estimated the range of reasonably possible loss for these matters to be from zero to approximately $15 million in the aggregate. The Corporation’s estimate with respect to the aggregate range of reasonably possible loss is based upon currently available information and is subject to significant judgment and a variety of assumptions and known and unknown uncertainties. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from the current estimate.

In certain other pending matters, there may be a range of reasonably possible loss (including reasonably possible loss in excess of amounts accrued) that cannot be reasonably estimated for the reasons described above. Such matters are not included in the estimated range of reasonably possible loss discussed above.

In 2015, Northern Trust Fiduciary Services (Guernsey) Limited (NTFS), an indirect subsidiary of the Corporation, was charged by a French investigating magistrate judge with complicity in estate tax fraud in connection with the administration of two trusts for which it serves as trustee. Charges also were brought against a number of other persons and entities related to this matter. In 2017, a French court found no estate tax fraud had occurred and NTFS and all other persons and entities charged were acquitted. The Public Prosecutor’s Office of France appealed the court decision and in June 2018 a French appellate court issued its opinion on the matter, acquitting all persons and entities charged, including NTFS. The Public Prosecutor’s Office of France has appealed the appellate court’s decision to the Cour de Cassation, the highest court in France. As trustee, NTFS provided no tax advice and had no involvement in the preparation or filing of the challenged estate tax filings.

Visa Class B Common Shares. Northern Trust, as a member of Visa U.S.A. Inc. (Visa U.S.A.) and in connection with the 2007 restructuring of Visa U.S.A. and its affiliates and the 2008 initial public offering of Visa Inc. (Visa), received certain Visa

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Notes to Consolidated Financial Statements (unaudited) (continued)

Class B common shares. The Visa Class B common shares are subject to certain selling restrictions until the final resolution of certain litigation related to interchange fees involving Visa (the covered litigation), at which time the shares are convertible into Visa Class A common shares based on a conversion rate dependent upon the ultimate cost of resolving the covered litigation. On June 28, 2018, and September 27, 2019, Visa deposited an additional $600 million and $300 million, respectively, into an escrow account previously established with respect to the covered litigation. As a result of the additional contributions to the escrow account, the rate at which Visa Class B common shares will convert into Visa Class A common shares was reduced.

In September 2018, Visa reached a proposed class settlement agreement covering damage claims but not injunctive relief claims regarding the covered litigation. In December 2019, the district court granted final approval for the proposed class settlement agreement. Certain merchants have opted out of the class settlement and are pursuing claims separately, while other merchants have appealed the approval order granted by the district court. The ultimate resolution of the covered litigation, the timing for removal of the selling restrictions on the Visa Class B common shares and the rate at which such shares will ultimately convert into Visa Class A common shares are uncertain.

In June 2016 and 2015, Northern Trust recorded a $123.1 million and $99.9 million net gain on the sale of 1.1 million and 1.0 million of its Visa Class B common shares, respectively. These sales do not affect Northern Trust’s risk related to the impact of the covered litigation on the rate at which such shares will ultimately convert into Visa Class A common shares. Northern Trust continued to hold approximately 4.1 million Visa Class B common shares, which are recorded at their original cost basis of zero, as of September 30, 2020 and December 31, 2019.

Note 20 – Derivative Financial Instruments

Northern Trust is a party to various derivative financial instruments that are used in the normal course of business to meet the needs of its clients, as part of its trading activity for its own account and as part of its risk management activities. These instruments may include foreign exchange contracts, interest rate contracts, total return swap contracts, and swaps related to the sale of certain Visa Class B common shares.

Foreign exchange contracts are agreements to exchange specific amounts of currencies at a future date, at a specified rate of exchange. Foreign exchange contracts are entered into primarily to meet the foreign exchange needs of clients. Foreign exchange contracts are also used for trading and risk management purposes. For risk management purposes, Northern Trust uses foreign exchange contracts to reduce its exposure to changes in foreign exchange rates relating to certain forecasted non-functional-currency-denominated revenue and expenditure transactions, foreign-currency-denominated assets and liabilities, including debt securities, and net investments in non-U.S. affiliates.

Interest rate contracts include swap and option contracts. Interest rate swap contracts involve the exchange of fixed and floating rate interest payment obligations without the exchange of the underlying principal amounts. Northern Trust enters into interest rate swap contracts with its clients and also may utilize such contracts to reduce or eliminate the exposure to changes in the cash flows or fair value of hedged assets or liabilities due to changes in interest rates. Interest rate option contracts may include caps, floors, collars and swaptions, and provide for the transfer or reduction of interest rate risk, typically in exchange for a fee. Northern Trust enters into option contracts primarily as a seller of interest rate protection to clients. Northern Trust receives a fee at the outset of the agreement for the assumption of the risk of an unfavorable change in interest rates. This assumed interest rate risk is then mitigated by entering into an offsetting position with an outside counterparty. Northern Trust may also purchase or enter into option contracts for risk management purposes including to reduce the exposure to changes in the cash flows of hedged assets due to changes in interest rates.

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Notes to Consolidated Financial Statements (unaudited) (continued)

The following table shows the notional and fair values of all derivative financial instruments as of September 30, 2020 and December 31, 2019.

TABLE 75: NOTIONAL AND FAIR VALUES OF DERIVATIVE FINANCIAL INSTRUMENTS

	SEPTEMBER 30, 2020						DECEMBER 31, 2019
	NOTIONAL VALUE		FAIR VALUE				NOTIONAL VALUE		FAIR VALUE
(In Millions)			ASSET(1)		LIABILITY(2)				ASSET(1)		LIABILITY(2)
Derivatives Designated as Hedging under GAAP
Interest Rate Contracts
Fair Value Hedges	$	5,357.8	$	10.2	$	18.9	$	4,538.2	$	20.3	$	20.9
Cash Flow Hedges	150.0		0.3		—		200.0		0.2		0.2
Foreign Exchange Contracts
Cash Flow Hedges	5,882.7		14.0		28.9		1,661.5		8.5		11.5
Net Investment Hedges	3,165.3		20.8		83.3		2,873.8		73.7		11.9
Total Derivatives Designated as Hedging under GAAP	$	14,555.8	$	45.3	$	131.1	$	9,273.5	$	102.7	$	44.5
Derivatives Not Designated as Hedging under GAAP
Non-Designated Risk Management Derivatives
Foreign Exchange Contracts	$	79.2	$	2.0	$	0.6	$	176.5	$	0.9	$	0.7
Other Financial Derivatives(3)	681.5		—		32.3		640.3		—		33.4
Total Non-Designated Risk Management Derivatives	$	760.7	$	2.0	$	32.9	$	816.8	$	0.9	$	34.1
Client-Related and Trading Derivatives
Foreign Exchange Contracts	$	255,799.4	$	2,242.7	$	2,213.5	$	291,533.6	$	3,151.7	$	3,158.1
Interest Rate Contracts	10,213.8		323.2		123.3		8,976.8		132.4		76.3
Total Client-Related and Trading Derivatives	$	266,013.2	$	2,565.9	$	2,336.8	$	300,510.4	$	3,284.1	$	3,234.4
Total Derivatives Not Designated as Hedging under GAAP	$	266,773.9	$	2,567.9	$	2,369.7	$	301,327.2	$	3,285.0	$	3,268.5
Total Gross Derivatives	$	281,329.7	$	2,613.2	$	2,500.8	$	310,600.7	$	3,387.7	$	3,313.0
Less: Netting(4)			1,408.3		1,603.3				2,338.0		1,618.4
Total Derivative Financial Instruments			$	1,204.9	$	897.5			$	1,049.7	$	1,694.6

⁽¹⁾    Derivative assets are reported in Other Assets on the consolidated balance sheets.

⁽²⁾    Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets.

⁽³⁾    This line includes swaps related to sales of certain Visa Class B common shares.

⁽⁴⁾    See further detail in Note 21 — Offsetting of Assets and Liabilities.

Notional amounts of derivative financial instruments do not represent credit risk, and are not recorded in the consolidated balance sheets. They are used merely to express the volume of this activity. Northern Trust’s credit-related risk of loss is limited to the positive fair value of the derivative instrument, net of any collateral received, which is significantly less than the notional amount.

All derivative financial instruments, whether designated as hedges or not, are recorded on the consolidated balance sheets at fair value within Other Assets or Other Liabilities. Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty.

Hedging Derivative Instruments Designated under GAAP. Northern Trust uses derivative instruments to hedge its exposure to foreign currency, interest rate, and equity price. Certain hedging relationships are formally designated and qualify for hedge accounting under GAAP as fair value, cash flow or net investment hedges. Other derivatives that are entered into for risk management purposes as economic hedges are not formally designated as hedges and changes in fair value are recognized currently in Other Operating Income within the consolidated statements of income (see below section “Derivative Instruments Not Designated as Hedging under GAAP”).

In order to qualify for hedge accounting, a formal assessment is performed on a calendar-quarter basis to verify that derivatives used in designated hedging transactions continue to be highly effective in offsetting the changes in fair value or cash flows of the hedged item. If a derivative ceases to be highly effective, matures, is sold or is terminated, or if a hedged forecasted transaction is no longer probable of occurring, hedge accounting is terminated and the derivative is treated as if it were a trading instrument.

Fair Value Hedges. Derivatives are designated as fair value hedges to limit Northern Trust’s exposure to changes in the fair value of assets and liabilities due to movements in interest rates. Northern Trust enters into interest rate swaps to hedge changes in fair value of available for sale debt securities and long-term subordinated debt and senior notes. Northern Trust applied the

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Notes to Consolidated Financial Statements (unaudited) (continued)

“shortcut” method of accounting, available under GAAP, which assumes there is perfect effectiveness in a hedge, for all of its fair value hedges during the three- and nine- month periods ended September 30, 2020 and 2019. Changes in the fair value of the derivative instrument and changes in the fair value of the hedged asset or liability attributable to the hedged risk are recognized currently in earnings within the same income statement line item.

Cash Flow Hedges. Derivatives are also designated as cash flow hedges in order to minimize the variability in cash flows of earning assets or forecasted transactions caused by movements in interest or foreign exchange rates. Northern Trust enters into foreign exchange contracts to hedge changes in cash flows due to movements in foreign exchange rates of forecasted foreign- currency-denominated transactions and foreign-currency-denominated debt securities. Northern Trust also enters into interest rate contracts to hedge changes in cash flows due to movements in interest rates of available for sale debt securities. The change in fair value of cash flow hedging derivative instruments are recorded in AOCI and reclassified to earnings when the hedged forecasted transaction impacts earnings within the same income statement line item.

There were no material gains or losses reclassified into earnings during the three- and nine- month periods ended September 30, 2020 and 2019, as a result of the discontinuance of forecasted transactions that were no longer probable of occurring. It is estimated that net gains of $0.9 million and net losses of $16.3 million will be reclassified into net income within the next twelve months relating to cash flow hedges of foreign-currency-denominated transactions and cash flow hedges of foreign-currency-denominated debt securities, respectively. It is estimated that net gains of $0.3 million will be reclassified into net income upon the receipt of interest payments on earning assets within the next twelve months relating to cash flow hedges of available for sale debt securities. As of September 30, 2020, 23 months was the maximum length of time over which the exposure to variability in future cash flows of forecasted foreign-currency-denominated transactions was being hedged.

The following tables provide fair value and cash flow hedge derivative gains and losses recognized in income during the three- and nine- month periods ended September 30, 2020 and 2019.

TABLE 76: LOCATION AND AMOUNT OF FAIR VALUE AND CASH FLOW HEDGE DERIVATIVE GAINS AND LOSSES RECORDED IN INCOME

(In Millions)	INTEREST INCOME				INTEREST EXPENSE				OTHER OPERATING INCOME
THREE MONTHS ENDED SEPTEMBER 30,	2020		2019		2020		2019		2020		2019
Total amounts on the consolidated statements of income	$	355.4	$	620.8	$	26.8	$	203.1	$	53.5	$	45.1
Gains (Losses) on fair value hedges recognized on
Interest Rate Contracts
Recognized on derivatives	15.1		(14.9)		(2.9)		51.4		—		—
Recognized on hedged items	(15.1)		14.9		2.9		(51.4)		—		—
Amounts related to interest settlements on derivatives	(14.2)		2.8		(2.5)		(6.0)		—		—
Total gains (losses) recognized on fair value hedges	$	(14.2)	$	2.8	$	(2.5)	$	(6.0)	$	—	$	—
Gains (Losses) on cash flow hedges recognized on
Foreign Exchange Contracts
Net gains (losses) reclassified from AOCI to net income	$	4.2	$	2.7	$	—	$	—	$	0.3	$	1.4
Interest Rate Contracts
Net gains (losses) reclassified from AOCI to net income	0.2		(0.1)		—		—		—		—
Total gains (losses) reclassified from AOCI to net income on cash flow hedges	$	4.4	$	2.6	$	—	$	—	$	0.3	$	1.4

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Notes to Consolidated Financial Statements (unaudited) (continued)

(In Millions)	INTEREST INCOME				INTEREST EXPENSE				OTHER OPERATING INCOME
NINE MONTHS ENDED SEPTEMBER 30,	2020		2019		2020		2019		2020		2019
Total amounts on the consolidated statements of income	$	1,290.9	$	1,923.8	$	182.1	$	666.7	$	144.4	$	113.0
Gains (Losses) on fair value hedges recognized on
Interest Rate Contracts
Recognized on derivatives	(75.6)		(99.0)		152.1		141.6		—		—
Recognized on hedged items	75.6		99.0		(152.1)		(141.6)		—		—
Amounts related to interest settlements on derivatives	(11.6)		13.3		6.1		(3.9)		—		—
Total gains (losses) recognized on fair value hedges	$	(11.6)	$	13.3	$	6.1	$	(3.9)	$	—	$	—
Gains (Losses) on cash flow hedges recognized on
Foreign Exchange Contracts
Net gains (losses) reclassified from AOCI to net income	$	10.8	$	20.8	$	—	$	—	$	0.1	$	1.1
Interest Rate Contracts
Net gains (losses) reclassified from AOCI to net income	0.3		(0.5)		—		—		—		—
Total gains (losses) reclassified from AOCI to net income on cash flow hedges	$	11.1	$	20.3	$	—	$	—	$	0.1	$	1.1

The following table provides the impact of fair value hedge accounting on the carrying value of the designated hedged items as of September 30, 2020 and December 31, 2019.

TABLE 77: HEDGED ITEMS IN FAIR VALUE HEDGES

	SEPTEMBER 30, 2020				DECEMBER 31, 2019
(In Millions)	CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(1)		CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(2)
Available for Sale Debt Securities(3)	$	2,826.2	$	63.3	$	2,981.0	$	3.3
Senior Notes and Long-Term Subordinated Debt	2,745.0		261.8		1,748.5		126.9
Total	$	5,571.2	$	325.1	$	4,729.5	$	130.2

⁽¹⁾    The cumulative hedge accounting basis adjustment includes $6.7 million related to discontinued hedging relationships of available for sale debt securities as of September 30, 2020. There are no amounts related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of September 30, 2020.

⁽²⁾    The cumulative hedge accounting basis adjustment includes $1.5 million related to discontinued hedging relationships of available for sale debt securities as of December 31, 2019. There were no amounts related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of December 31, 2019.

⁽³⁾    Carrying value represents amortized cost.

Net Investment Hedges. Certain foreign exchange contracts are designated as net investment hedges to minimize Northern Trust’s exposure to variability in the foreign currency translation of net investments in non-U.S. branches and subsidiaries. Net investment hedge losses of $117.4 million and gains of $107.6 million were recognized in AOCI related to foreign exchange contracts for the three months ended September 30, 2020 and 2019, respectively. Net investment hedge losses of $29.8 million and gains of $144.1 million were recognized in AOCI related to foreign exchange contracts for the nine months ended September 30, 2020 and 2019, respectively.

Derivative Instruments Not Designated as Hedging under GAAP. Northern Trust’s derivative instruments that are not designated as hedging under GAAP include derivatives for purposes of client-related and trading activities, as well as other risk management purposes. These activities consist principally of providing foreign exchange services to clients in connection with Northern Trust’s global custody business. However, in the normal course of business, Northern Trust also engages in trading of currencies for its own account.

Non-designated risk management derivatives include foreign exchange contracts entered into to manage the foreign currency risk of non-U.S.-dollar-denominated assets and liabilities, the net investment in certain non-U.S. affiliates, commercial loans and forecasted foreign-currency-denominated transactions. Swaps related to sales of certain Visa Class B common shares were entered into pursuant to which Northern Trust retains the risks associated with the ultimate conversion of the Visa Class B common shares into Visa Class A common shares. Total return swaps are entered into to manage the equity price risk associated with certain investments.

Changes in the fair value of derivative instruments not designated as hedges under GAAP are recognized currently in income. The following table provides the location and amount of gains and losses recorded in the consolidated statements of income for the three and nine months ended September 30, 2020 and 2019 for derivative instruments not designated as hedges under GAAP.

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Notes to Consolidated Financial Statements (unaudited) (continued)

TABLE 78: LOCATION AND AMOUNT OF GAINS AND LOSSES RECORDED IN INCOME FOR DERIVATIVES NOT DESIGNATED AS HEDGING UNDER GAAP

(In Millions)	DERIVATIVE GAINS (LOSSES) LOCATION RECOGNIZED IN INCOME	AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME
		THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
		2020		2019		2020		2019
Non-designated risk management derivatives
Foreign Exchange Contracts	Other Operating Income	$	4.2	$	(1.8)	$	3.8	$	(1.7)
Other Financial Derivatives(1)	Other Operating Income	(5.3)		(6.4)		(11.0)		(17.8)
Gains (Losses) from non-designated risk management derivatives		$	(1.1)	$	(8.2)	$	(7.2)	$	(19.5)
Client-related and trading derivatives
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	61.6	$	59.7	$	221.8	$	186.4
Interest Rate Contracts	Security Commissions and Trading Income	2.3		4.9		18.5		9.2
Gains (Losses) from client-related and trading derivatives		$	63.9	$	64.6	$	240.3	$	195.6
Total gains (losses) from derivatives not designated as hedging under GAAP		$	62.8	$	56.4	$	233.1	$	176.1

⁽¹⁾    This line includes swaps related to the sale of certain Visa Class B common shares and total return swap contracts.

Note 21 – Offsetting of Assets and Liabilities

Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty.

The following table provides information regarding the offsetting of derivative assets and securities purchased under agreements to resell within the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

TABLE 79: OFFSETTING OF DERIVATIVE ASSETS AND SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL

	SEPTEMBER 30, 2020
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(4)
Derivative Assets(1)
Foreign Exchange Contracts Over the Counter (OTC)	$	1,764.3	$	1,405.7	$	358.6	$	29.7	$	328.9
Interest Rate Swaps OTC	333.7		2.6		331.1		—		331.1
Total Derivatives Subject to a Master Netting Arrangement	2,098.0		1,408.3		689.7		29.7		660.0
Total Derivatives Not Subject to a Master Netting Arrangement	515.2		—		515.2		0.9		514.3
Total Derivatives	2,613.2		1,408.3		1,204.9		30.6		1,174.3
Securities Purchased under Agreements to Resell(3)	$	1,533.4	$	—	$	1,533.4	$	1,533.4	$	—

	DECEMBER 31, 2019
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(4)
Derivative Assets(1)
Foreign Exchange Contracts OTC	$	2,691.1	$	2,334.1	$	357.0	$	16.5	$	340.5
Interest Rate Swaps OTC	151.9		3.9		148.0		—		148.0
Interest Rate Swaps Exchange Cleared	1.0		—		1.0		—		1.0
Total Derivatives Subject to a Master Netting Arrangement	2,844.0		2,338.0		506.0		16.5		489.5
Total Derivatives Not Subject to a Master Netting Arrangement	543.7		—		543.7		0.3		543.4
Total Derivatives	3,387.7		2,338.0		1,049.7		16.8		1,032.9
Securities Purchased under Agreements to Resell(3)	$	707.8	$	—	$	707.8	$	707.8	$	—

⁽¹⁾Derivative assets are reported in Other Assets on the consolidated balance sheets. Other Assets (excluding derivative assets) totaled $7.3 billion and $7.4 billion as of September 30, 2020 and December 31, 2019, respectively.

⁽²⁾Including cash collateral received from counterparties.

⁽³⁾Securities purchased under agreements to resell are reported in Federal Funds Sold and Securities Purchased under Agreements to Resell on the consolidated balance sheets. There were no Federal Funds Sold as of September 30, 2020 and $5.0 million of Federal Funds Sold as of December 31, 2019.

⁽⁴⁾Northern Trust did not possess any cash collateral that was not offset in the consolidated balance sheets that could have been used to offset the net amounts presented in the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

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Notes to Consolidated Financial Statements (unaudited) (continued)

The following table provides information regarding the offsetting of derivative liabilities and securities sold under agreements to repurchase within the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

TABLE 80: OFFSETTING OF DERIVATIVE LIABILITIES AND SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE

	SEPTEMBER 30, 2020
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(3)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	1,969.2	$	1,493.6	$	475.6	$	—	$	475.6
Interest Rate Swaps OTC	142.3		109.7		32.6		—		32.6
Other Financial Derivatives	32.3		—		32.3		—		32.3
Total Derivatives Subject to a Master Netting Arrangement	2,143.8		1,603.3		540.5		—		540.5
Total Derivatives Not Subject to a Master Netting Arrangement	357.0		—		357.0		—		357.0
Total Derivatives	2,500.8		1,603.3		897.5		—		897.5
Securities Sold under Agreements to Repurchase	$	269.8	$	—	$	269.8	$	269.8	$	—

	DECEMBER 31, 2019
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(3)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	2,181.6	$	1,548.6	$	633.0	$	0.1	$	632.9
Interest Rate Swaps OTC	96.7		57.3		39.4		—		39.4
Interest Rate Swaps Exchange Cleared	0.7		—		0.7		—		0.7
Other Financial Derivatives	33.4		12.5		20.9		—		20.9
Total Derivatives Subject to a Master Netting Arrangement	2,312.4		1,618.4		694.0		0.1		693.9
Total Derivatives Not Subject to a Master Netting Arrangement	1,000.6		—		1,000.6		—		1,000.6
Total Derivatives	3,313.0		1,618.4		1,694.6		0.1		1,694.5
Securities Sold under Agreements to Repurchase	$	489.7	$	—	$	489.7	$	489.7	$	—

⁽¹⁾Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets. Other Liabilities (excluding derivative liabilities) totaled $3.6 billion and $3.1 billion as of September 30, 2020 and December 31, 2019, respectively.

⁽²⁾Including cash collateral deposited with counterparties.

⁽³⁾Northern Trust did not place any cash collateral with counterparties that was not offset in the consolidated balance sheets that could have been used to offset the net amounts presented in the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

All of Northern Trust’s securities sold under agreements to repurchase (repurchase agreements) and securities purchased under agreements to resell (reverse repurchase agreements) involve the transfer of financial assets in exchange for cash subject to a right and obligation to repurchase those assets for an agreed upon amount. In the event of a repurchase failure, the cash or financial assets are available for offset. All of Northern Trust’s repurchase agreements and reverse repurchase agreements are subject to a master netting arrangement, which sets forth the rights and obligations for repurchase and offset. Under the master netting arrangement, Northern Trust is entitled to offset receivables from and collateral placed with a single counterparty against obligations owed to that counterparty. In addition, collateral held by Northern Trust can be offset against receivables from that counterparty. However, Northern Trust’s repurchase agreements and reverse repurchase agreements do not meet the requirements to net under GAAP.

Derivative asset and liability positions with a single counterparty can be offset against each other in cases where legally enforceable master netting arrangements or similar agreements exist. Derivative assets and liabilities can be further offset by cash collateral received from, and deposited with, the transacting counterparty. The basis for this view is that, upon termination of transactions subject to a master netting arrangement or similar agreement, the individual derivative receivables do not represent resources to which general creditors have rights and individual derivative payables do not represent claims that are equivalent to the claims of general creditors.

Credit risk associated with derivative instruments relates to the failure of the counterparty and the failure of Northern Trust to pay based on the contractual terms of the agreement, and is generally limited to the unrealized fair value gains and losses on these instruments, net of any collateral received or deposited. The amount of credit risk will increase or decrease during the lives of the instruments as interest rates, foreign exchange rates, or equity prices fluctuate. Northern Trust’s risk is controlled by

88

Notes to Consolidated Financial Statements (unaudited) (continued)

limiting such activity to an approved list of counterparties and by subjecting such activity to the same credit and quality controls as are followed in lending and investment activities. Credit Support Annexes and other similar agreements are currently in place with a number of Northern Trust’s counterparties which mitigate the aforementioned credit risk associated with derivative activity conducted with those counterparties by requiring that significant net unrealized fair value gains be supported by collateral placed with Northern Trust.

Additional cash collateral received from and deposited with derivative counterparties totaling $281.0 million and $280.8 million, respectively, as of September 30, 2020, and $196.3 million and $2.0 million, respectively, as of December 31, 2019, was not offset against derivative assets and liabilities in the consolidated balance sheets as the amounts exceeded the net derivative positions with those counterparties.

Certain master netting arrangements Northern Trust enters into with derivative counterparties contain credit-risk-related contingent features in which the counterparty has the option to declare Northern Trust in default and accelerate cash settlement of net derivative liabilities with the counterparty in the event Northern Trust’s credit rating falls below specified levels. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position was $565.5 million and $766.2 million at September 30, 2020 and December 31, 2019, respectively. Cash collateral amounts deposited with derivative counterparties on those dates included $184.4 million and $327.1 million, respectively, posted against these liabilities, resulting in a net maximum amount of termination payments that could have been required at September 30, 2020 and December 31, 2019, of $381.1 million and $439.1 million, respectively. Accelerated settlement of these liabilities would not have a material effect on the consolidated financial position or liquidity of Northern Trust.

Item 4. Controls and Procedures

As of September 30, 2020, the Corporation’s management, with the participation of the Corporation’s Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of the Corporation’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the Exchange Act)), that are designed to ensure that information required to be disclosed by the Corporation in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified by the SEC’s rules and forms. Based on such evaluation, such officers have concluded that, as of September 30, 2020, the Corporation’s disclosure controls and procedures are effective.

There have been no changes in the Corporation’s internal control over financial reporting identified in connection with the evaluation required by Rules 13a-15 and 15d-15 under the Exchange Act during the last fiscal quarter that have materially affected, or that are reasonably likely to materially affect, the Corporation’s internal control over financial reporting.

89

PART II — OTHER INFORMATION

Item 1. Legal Proceedings

The information presented under the caption “Legal Proceedings” in Note 19 — Commitments and Contingent Liabilities included under Part I, Item 1 of this Form 10-Q is incorporated herein by reference.

Item 1A. Risk Factors

Our business, results of operations, and financial condition have been, and will likely continue to be, adversely affected by the ongoing COVID-19 pandemic. 

The ongoing COVID-19 pandemic, and governmental and societal responses thereto, have had a severe impact on recent global economic and market conditions, including significant disruption of, and volatility in, financial markets; global supply chain disruptions; and the institution of social distancing and shelter-in-place requirements that have resulted in temporary closures of many businesses, lost revenues, and increased unemployment.

These conditions have impacted—and/or may in the future impact—our business, results of operations, and financial condition negatively, including through lower revenue from certain of our fee-based businesses; lower net interest income resulting from lower interest rates; increased provisions for credit losses; impairments on the securities we hold; and decreased demand for certain of our products and services. Additionally, our liquidity and regulatory capital could be adversely impacted by volatility and disruptions in the capital and credit markets; volatility in foreign exchange rates; deposit flows; and client draws on lines of credit. Our business operations may also be disrupted if significant portions of our workforce are unable to work effectively, including because of illness, quarantines, government actions, or other restrictions in connection with the pandemic.

While governmental authorities have taken unprecedented measures to provide economic assistance to individual households and businesses, stabilize the markets, and support economic growth, the ultimate success of these measures is unknown and they may not be sufficient to mitigate fully the negative impact of the ongoing pandemic. Further, some measures, such as a suspension of mortgage and other loan payments and foreclosures, may have a negative impact on our business, while our participation in other measures could result in reputational harm, litigation, or regulatory and government actions, proceedings, or penalties.

The extent to which the COVID-19 pandemic impacts our business, results of operations and financial condition will depend on future developments, which are highly uncertain and are difficult to predict, including, but not limited to, the duration and spread of the outbreak, its severity, the actions to contain the virus or treat its impact, and how quickly and to what extent normal economic and operating conditions can resume. The ongoing pandemic may also have the effect of heightening many of the other risks described in the section entitled “Risk Factors” in our most recent Annual Report on Form 10-K and any subsequent filings with the SEC.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(c) The following table shows certain information relating to the Corporation’s purchases of common stock for the three months ended September 30, 2020.

TABLE 81: REPURCHASES OF COMMON STOCK

PERIOD	TOTAL NUMBER OF SHARES PURCHASED	AVERAGE PRICE PAID PER SHARE		TOTAL NUMBER OF SHARES PURCHASED AS PART OF A PUBLICLY ANNOUNCED PLAN	MAXIMUM NUMBER OF SHARES THAT MAY YET BE PURCHASED UNDER THE PLAN
July 1 - 31, 2020	—	$	—	—	6,487,647
August 1 - 31, 2020	—	—		—	6,487,647
September 1 - 30, 2020	—	—		—	6,487,647
Total (Third Quarter)	—	$	—	—	6,487,647

On March 16, 2020, the Corporation suspended its share repurchase program, previously announced by the Corporation on July 17, 2018, under which the Corporation’s Board of Directors authorized the Corporation to repurchase up to 25.0 million shares of the Corporation’s common stock. Further, during the second quarter of 2020, the Federal Reserve announced certain measures to ensure that large financial institutions, including Northern Trust, remain resilient despite the economic uncertainty resulting from the ongoing COVID-19 pandemic. Specifically, for the third quarter of 2020, no share repurchases were permitted by these institutions. On September 30, 2020, the Federal Reserve announced that these measures have been extended to apply to the fourth quarter of 2020 as well. The repurchase authorization approved by the Board of Directors has no

90

expiration date, thus the Corporation retains the ability to resume repurchases thereunder when circumstances warrant and applicable regulation permits. Please refer to Note 11 — Stockholders’ Equity to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

Item 6. Exhibits

Exhibit Number	Description
3.1	Certificate of Elimination of Series C Non-Cumulative Perpetual Preferred Stock of Northern Trust Corporation, dated July 21, 2020 (incorporated herein by reference to Exhibit 3.1 to the Corporation’s Current Report on Form 8-K filed July 24, 2020).
4.1	Certain instruments defining the rights of the holders of long-term debt of the Corporation and certain of its subsidiaries, none of which authorize a total amount of indebtedness in excess of 10% of the total assets of the Corporation and its subsidiaries on a consolidated basis, have not been filed as exhibits. The Corporation hereby agrees to furnish a copy of any of these agreements to the SEC upon request.
31.1	Rule 13a-14(a)/15d-14(a) Certification of CEO Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Rule 13a-14(a)/15d-14(a) Certification of CFO Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32	Certifications of CEO and CFO Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101	Includes the following financial and related information from Northern Trust’s Quarterly Report on Form 10-Q as of and for the quarter ended September 30, 2020, formatted in Inline Extensible Business Reporting Language (iXBRL): (1) the Consolidated Balance Sheets, (2) the Consolidated Statements of Income, (3) the Consolidated Statements of Comprehensive Income, (4) the Consolidated Statements of Changes in Stockholders’ Equity, (5) the Consolidated Statements of Cash Flows, and (6) Notes to Consolidated Financial Statements.
104	The cover page from this Quarterly Report on Form 10-Q, formatted in Inline XBRL.

91

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		NORTHERN TRUST CORPORATION
		(Registrant)
Date:	October 27, 2020	By:	/s/ Jason J. Tyler
			Jason J. Tyler Executive Vice President and Chief Financial Officer (Duly Authorized Officer and Principal Financial Officer)
Date:	October 27, 2020	By:	/s/ Lauren Allnutt
			Lauren Allnutt Senior Vice President and Controller (Principal Accounting Officer)

92

EX-31.1

Exhibit 31.1

Certification of CEO Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Michael G. O’Grady, certify that:

1.I have reviewed this report on Form 10-Q for the quarterly period ended September 30, 2020, of Northern Trust Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

		/s/ Michael G. O’Grady
Date:	October 27, 2020	Michael G. O’Grady
		Chief Executive Officer
		(Principal Executive Officer)

EX-31.2

Exhibit 31.2

Certification of CFO Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Jason J. Tyler, certify that:

1.I have reviewed this report on Form 10-Q for the quarterly period ended September 30, 2020, of Northern Trust Corporation;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

		/s/ Jason J. Tyler
Date:	October 27, 2020	Jason J. Tyler
		Chief Financial Officer
		(Principal Financial Officer)

EX-32

Exhibit 32

Certifications of CEO and CFO Pursuant to

18 U.S.C. Section 1350, as Adopted Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of Northern Trust Corporation (the “Corporation”) on Form 10-Q for the period ended September 30, 2020, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Michael G. O’Grady, as Chief Executive Officer of the Corporation, and Jason J. Tyler, as Chief Financial Officer of the Corporation, each hereby certifies, pursuant to 18 U.S.C. section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002, to the best of his knowledge, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Corporation.

/s/ Michael G. O’Grady

Michael G. O’Grady

Chief Executive Officer

(Principal Executive Officer)

Date: October 27, 2020

/s/ Jason J. Tyler

Jason J. Tyler

Chief Financial Officer

(Principal Financial Officer)

Date: October 27, 2020

This certification accompanies the Report pursuant to section 906 of the Sarbanes-Oxley Act of 2002 and shall not be deemed filed by Northern Trust Corporation for purposes of section 18 of the Securities Exchange Act of 1934, as amended.

XML

Cover Page	9 Months Ended
	Sep. 30, 2020 shares
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-36609
Entity Registrant Name	NORTHERN TRUST CORPORATION
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-2723087
Entity Address, Address Line One	50 South LaSalle Street
Entity Address, City or Town	Chicago,
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60603
City Area Code	312
Local Phone Number	630-6000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)	208,121,233
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Central Index Key	0000073124
Current Fiscal Year End Date	--12-31
Common Stock, $1.66 2/3 Par Value
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, $1.66 2/3 Par Value
Trading Symbol	NTRS
Security Exchange Name	NASDAQ
Depositary Shares, each representing 1/1,000th interest in a share of Series E Non-Cumulative Perpetual Preferred Stock
Entity Information [Line Items]
Title of 12(b) Security	Depositary Shares, each representing 1/1,000th interest in a share of Series E Non-Cumulative Perpetual Preferred Stock
Trading Symbol	NTRSO
Security Exchange Name	NASDAQ

XML

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and Due from Banks	$ 4,737.5	$ 4,459.2
Federal Reserve and Other Central Bank Deposits	39,244.6	33,886.0
Interest-Bearing Deposits with Banks	2,754.4	4,877.1
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,533.4	712.8
Debt Securities
Available for Sale (Amortized cost of $41,659.2 and $38,722.2)	42,551.0	38,876.3
Held to Maturity	16,754.0	12,284.5
Trading Account	0.6	0.3
Total Debt Securities	59,305.6	51,161.1
Loans and Leases
Loans and leases	32,766.3	31,409.6
Allowance for Credit Losses	(223.0)	(104.5)
Buildings and Equipment	510.0	483.3
Client Security Settlement Receivables	2,296.8	845.7
Goodwill	698.0	696.8
Other Assets	8,458.4	8,401.3
Total Assets	152,082.0	136,828.4
Deposits
Demand and Other Noninterest-Bearing	16,358.5	14,114.7
Savings, Money Market and Other Interest-Bearing	25,379.1	21,441.5
Savings Certificates and Other Time	1,486.7	986.7
Non U.S. Offices — Noninterest-Bearing	18,019.2	12,177.4
Non U.S. Offices — Interest-Bearing	61,345.6	60,400.3
Total Deposits	122,589.1	109,120.6
Federal Funds Purchased	2,203.7	552.9
Securities Sold Under Agreements to Repurchase	269.8	489.7
Other Borrowings	5,771.7	6,744.8
Senior Notes	3,655.6	2,573.0
Long-Term Debt	1,196.0	1,148.1
Floating Rate Capital Debt	277.7	277.7
Other Liabilities	4,539.3	4,830.6
Total Liabilities	140,502.9	125,737.4
STOCKHOLDERS' EQUITY
Common Stock	408.6	408.6
Additional Paid-In Capital	961.8	1,013.1
Retained Earnings	12,118.3	11,656.7
Accumulated Other Comprehensive Income (Loss)	424.5	(194.7)
Treasury Stock	(3,219.0)	(3,066.1)
Total Stockholders’ Equity	11,579.1	11,091.0
Total Liabilities and Stockholders’ Equity	$ 152,082.0	$ 136,828.4
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 1.6667	$ 1.6667
Common stock, authorized (in shares)	560,000,000	560,000,000
Series C Preferred Stock
STOCKHOLDERS' EQUITY
Preferred Stock	$ 0.0	$ 388.5
Preferred stock, outstanding (in shares)	0	16,000
Series D Preferred Stock
STOCKHOLDERS' EQUITY
Preferred Stock	$ 493.5	$ 493.5
Total Stockholders’ Equity	$ 493.5	$ 493.5
Preferred stock, outstanding (in shares)	5,000	5,000
Series E Preferred Stock
STOCKHOLDERS' EQUITY
Preferred Stock	$ 391.4	$ 391.4
Total Stockholders’ Equity	$ 391.4	$ 391.4
Preferred stock, par value (in dollars per share)	$ 0
Preferred stock, outstanding (in shares)	16,000	16,000
Commercial
Loans and Leases
Loans and leases	$ 14,581.7	$ 14,001.3
Personal
Loans and Leases
Loans and leases	$ 18,184.6	$ 17,408.3

XML

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Available-for-sale securities, amortized cost	$ 41,659.2	$ 38,722.2
Unearned income	14.6	14.1
Held to maturity, fair value	$ 16,746.5	$ 12,249.3
Preferred stock, authorized (in shares)	10,000,000	10,000,000
Common stock, par value (in dollars per share)	$ 1.6667	$ 1.6667
Common stock, authorized (in shares)	560,000,000	560,000,000
Common stock, outstanding (in shares)	208,121,233	209,709,046
Treasury stock (in shares)	37,050,291	35,462,478
Series C Preferred Stock
Preferred stock, outstanding (in shares)	0	16,000
Series D Preferred Stock
Preferred stock, outstanding (in shares)	5,000	5,000
Series E Preferred Stock
Preferred stock, outstanding (in shares)	16,000	16,000

XML

Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 1,003.8	$ 975.5	$ 2,968.9	$ 2,859.9
Foreign Exchange Trading Income	61.6	59.7	221.8	186.4
Treasury Management Fees	11.6	11.2	34.0	34.1
Security Commissions and Trading Income	26.0	29.1	100.9	75.8
Other Operating Income	53.5	45.1	144.4	113.0
Investment Security Gains (Losses), net (Note)	0.0	(0.4)	0.1	(0.9)
Total Noninterest Income	1,156.5	1,120.2	3,470.1	3,268.3
Net Interest Income
Interest Income	355.4	620.8	1,290.9	1,923.8
Interest Expense	26.8	203.1	182.1	666.7
Net Interest Income	328.6	417.7	1,108.8	1,257.1
Provision for Credit Losses	0.5	(7.0)	127.5	(13.5)
Net Interest Income after Provision for Credit Losses	328.1	424.7	981.3	1,270.6
Noninterest Expense
Compensation	461.7	458.0	1,421.8	1,395.5
Employee Benefits	97.5	87.6	285.8	262.6
Outside Services	186.0	194.0	555.0	568.8
Equipment and Software	170.7	151.7	497.1	447.2
Occupancy	51.8	53.0	162.9	155.5
Other Operating Expense	127.0	92.0	274.6	241.6
Total Noninterest Expense	1,094.7	1,036.3	3,197.2	3,071.2
Income before Income Taxes	389.9	508.6	1,254.2	1,467.7
Provision for Income Taxes	95.4	124.0	285.8	346.6
Net Income	294.5	384.6	968.4	1,121.1
Preferred Stock Dividends	16.2	17.4	51.5	40.6
Net Income Applicable to Common Stock	$ 278.3	$ 367.2	$ 916.9	$ 1,080.5
Per Common Share
Net Income — Basic (in dollars per share)	$ 1.32	$ 1.70	$ 4.35	$ 4.95
Net Income - Diluted (in dollars per share)	$ 1.32	$ 1.69	$ 4.34	$ 4.92
Average number of common shares outstanding
Average Number of Common Shares Outstanding - Basic (in shares)	208,106,190	213,176,809	208,351,088	215,832,347
Average Number of Common Shares Outstanding - Diluted (in shares)	208,688,494	214,206,576	209,023,331	216,863,563
Note: Changes in Other-Than-Temporary-Impairment (OTTI) Losses prior to the adoption of ASU 2016-13	$ 0.0	$ (0.1)	$ 0.0	$ (0.3)
Other Security Gains (Losses), net	0.0	(0.3)	0.1	(0.6)
Investment Security Gains (Losses), net	$ 0.0	$ (0.4)	$ 0.1	$ (0.9)

XML

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net Income	$ 294.5	$ 384.6	$ 968.4	$ 1,121.1
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)
Net Unrealized Gains on Debt Securities Available for Sale	33.5	57.0	551.3	305.0
Net Unrealized Gains (Losses) on Cash Flow Hedges	1.3	(2.4)	5.3	(1.9)
Net Foreign Currency Adjustments	1.8	9.9	29.5	38.8
Net Pension and Other Postretirement Benefit Adjustments	17.5	4.3	33.1	20.8
Net Change	54.1	68.8	619.2	362.7
Comprehensive Income	$ 348.6	$ 453.4	$ 1,587.6	$ 1,483.8

XML

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Cumulative Effect Adjustment	Adjusted Balance	PREFERRED STOCK	PREFERRED STOCK Adjusted Balance	COMMON STOCK	COMMON STOCK Adjusted Balance	ADDITIONAL PAID-IN CAPITAL	ADDITIONAL PAID-IN CAPITAL Adjusted Balance	RETAINED EARNINGS	RETAINED EARNINGS Cumulative Effect Adjustment	RETAINED EARNINGS Adjusted Balance	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Adjusted Balance	TREASURY STOCK	TREASURY STOCK Adjusted Balance
Beginning balance at Dec. 31, 2018	$ 10,508.3			$ 882.0		$ 408.6		$ 1,068.5		$ 10,776.8			$ (453.7)		$ (2,173.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	347.1									347.1
Net Change	108.4												108.4
Dividends [Abstract]
Common Stock	(133.7)									(133.7)
Preferred Stock	(17.3)									(17.3)
Stock Awards and Options Exercised	60.8							(65.2)							126.0
Stock Purchased	(257.4)														(257.4)
Ending balance at Mar. 31, 2019	10,616.2			882.0		408.6		1,003.3		10,972.9			(345.3)		(2,305.3)
Beginning balance at Dec. 31, 2018	10,508.3			882.0		408.6		1,068.5		10,776.8			(453.7)		(2,173.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	1,121.1
Net Change	362.7
Ending balance at Sep. 30, 2019	10,811.3			882.0		408.6		1,009.7		11,441.2			(91.0)		(2,839.2)
Beginning balance at Mar. 31, 2019	10,616.2			882.0		408.6		1,003.3		10,972.9			(345.3)		(2,305.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	389.4									389.4
Net Change	185.5												185.5
Dividends [Abstract]
Common Stock	(130.9)									(130.9)
Preferred Stock	(5.9)									(5.9)
Stock Awards and Options Exercised	22.4							10.5							11.9
Stock Purchased	(271.2)														(271.2)
Ending balance at Jun. 30, 2019	10,805.5			882.0		408.6		1,013.8		11,225.5			(159.8)		(2,564.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	384.6									384.6
Net Change	68.8												68.8
Dividends [Abstract]
Common Stock	(151.5)									(151.5)
Preferred Stock	(17.4)									(17.4)
Stock Awards and Options Exercised	28.5							(4.1)							32.6
Stock Purchased	(307.2)														(307.2)
Ending balance at Sep. 30, 2019	10,811.3			882.0		408.6		1,009.7		11,441.2			(91.0)		(2,839.2)
Beginning balance at Dec. 31, 2019	11,091.0	$ (10.1)	$ 11,080.9	1,273.4	$ 1,273.4	408.6	$ 408.6	1,013.1	$ 1,013.1	11,656.7	$ (10.1)	$ 11,646.6	(194.7)	$ (194.7)	(3,066.1)	$ (3,066.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	360.6									360.6
Net Change	239.7												239.7
Dividends [Abstract]
Common Stock	(148.6)									(148.6)
Preferred Stock	(19.0)									(19.0)
Redemption of Preferred Stock, Series C	(400.0)			(388.5)						(11.5)
Stock Awards and Options Exercised	62.9							(74.8)							137.7
Stock Purchased	(296.8)														(296.8)
Ending balance at Mar. 31, 2020	10,879.7			884.9		408.6		938.3		11,828.1			45.0		(3,225.2)
Beginning balance at Dec. 31, 2019	11,091.0	$ (10.1)	$ 11,080.9	1,273.4	$ 1,273.4	408.6	$ 408.6	1,013.1	$ 1,013.1	11,656.7	$ (10.1)	$ 11,646.6	(194.7)	$ (194.7)	(3,066.1)	$ (3,066.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	968.4
Net Change	619.2
Dividends [Abstract]
Stock Purchased	(298.5)
Ending balance at Sep. 30, 2020	11,579.1			884.9		408.6		961.8		12,118.3			424.5		(3,219.0)
Beginning balance at Mar. 31, 2020	10,879.7			884.9		408.6		938.3		11,828.1			45.0		(3,225.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	313.3									313.3
Net Change	325.4												325.4
Dividends [Abstract]
Common Stock	(148.2)									(148.2)
Preferred Stock	(4.8)									(4.8)
Stock Awards and Options Exercised	17.0							13.2							3.8
Stock Purchased	(0.2)														(0.2)
Ending balance at Jun. 30, 2020	11,382.2			884.9		408.6		951.5		11,988.4			370.4		(3,221.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	294.5									294.5
Net Change	54.1												54.1
Dividends [Abstract]
Common Stock	(148.4)									(148.4)
Preferred Stock	(16.2)									(16.2)
Stock Awards and Options Exercised	14.4							10.3							4.1
Stock Purchased	(1.5)														(1.5)
Ending balance at Sep. 30, 2020	$ 11,579.1			$ 884.9		$ 408.6		$ 961.8		$ 12,118.3			$ 424.5		$ (3,219.0)

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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Statement of Stockholders' Equity [Abstract]
Common stock dividends (in usd per share)	$ 0.70	$ 0.70	$ 0.70	$ 0.70	$ 0.60	$ 0.60

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Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES
Net Income	$ 968.4	$ 1,121.1
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Investment Security (Losses) Gains, net	(0.1)	0.9
Amortization and Accretion of Securities and Unearned Income, net	63.3	51.7
Provision for Credit Losses	127.5	(13.5)
Depreciation on Buildings and Equipment	85.9	76.5
Amortization of Computer Software	274.0	252.6
Amortization of Intangibles	12.6	12.5
Pension Plan Contributions	(10.6)	(3.0)
Change in Receivables	47.6	(328.6)
Change in Interest Payable	(5.0)	(9.2)
Change in Collateral With Derivative Counterparties, net	(937.2)	39.8
Other Operating Activities, net	(205.9)	(245.2)
Net Cash Provided by Operating Activities	420.5	955.6
CASH FLOWS FROM INVESTING ACTIVITIES
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell	(717.9)	616.3
Change in Interest-Bearing Deposits with Banks	2,194.9	198.3
Net Change in Federal Reserve and Other Central Bank Deposits	(4,592.3)	7,032.2
Purchases of Debt Securities – Held to Maturity	(28,474.0)	(9,862.0)
Proceeds from Maturity and Redemption of Debt Securities – Held to Maturity	23,901.2	12,448.2
Purchases of Debt Securities – Available for Sale	(8,558.6)	(8,644.3)
Proceeds from Sale, Maturity and Redemption of Debt Securities – Available for Sale	5,761.9	6,910.0
Change in Loans and Leases	(1,339.6)	1,636.9
Purchases of Buildings and Equipment	(102.6)	(49.8)
Purchases and Development of Computer Software	(287.5)	(304.7)
Change in Client Security Settlement Receivables	(1,377.3)	(465.1)
Payments to Acquire Interest in Subsidiaries and Affiliates	0.0	(10.5)
Bank-Owned Life Insurance Policy Premiums	0.0	(1,000.0)
Other Investing Activities, net	477.3	492.9
Net Cash (Used in) Provided by Investing Activities	(13,114.5)	8,998.4
CASH FLOWS FROM FINANCING ACTIVITIES
Change in Deposits	12,697.8	(6,355.5)
Change In Federal Funds Purchased	1,650.8	(2,393.7)
Change in Securities Sold under Agreements to Repurchase	(219.9)	96.9
Change in Short-Term Other Borrowings	(934.0)	(118.7)
Redemption of Preferred Stock - Series C	(400.0)	0.0
Proceeds from Senior Notes	993.2	498.0
Treasury Stock Purchased	(298.5)	(835.8)
Net Proceeds from Stock Options	10.7	19.9
Cash Dividends Paid on Common Stock	(438.8)	(381.0)
Cash Dividends Paid on Preferred Stock	(29.7)	(29.1)
Other Financing Activities, net	0.7	0.1
Net Cash Provided by (Used in) Financing Activities	13,032.3	(9,498.9)
Effect of Foreign Currency Exchange Rates on Cash	(60.0)	0.9
Change in Cash and Due from Banks	278.3	456.0
Cash and Due from Banks at Beginning of Year	4,459.2	4,581.6
Cash and Due from Banks at End of Year	4,737.5	5,037.6
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Interest Paid	190.3	675.9
Income Taxes Paid	264.5	360.3
Transfers from Loans to OREO	0.2	2.6
Transfers from Debt Securities Available for Sale to Debt Securities Held to Maturity	$ 301.5	$ 0.0

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Basis of Presentation	9 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of PresentationThe consolidated financial statements include the accounts of Northern Trust Corporation (Corporation) and its wholly-owned subsidiary, The Northern Trust Company (Bank), and various other wholly-owned subsidiaries of the Corporation and Bank. Throughout the notes to the consolidated financial statements, the term “Northern Trust” refers to the Corporation and its subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. The consolidated financial statements, as of and for the periods ended September 30, 2020 and 2019, have not been audited by the Corporation’s independent registered public accounting firm. In the opinion of management, all accounting entries and adjustments, including normal recurring accruals, necessary for a fair presentation of the financial position and the results of operations for the interim periods have been made. The accounting and financial reporting policies of Northern Trust conform to U.S. generally accepted accounting principles (GAAP) and reporting practices prescribed for the banking industry. The consolidated statements of income include results of acquired subsidiaries from the dates of acquisition. Certain prior-period balances have been reclassified to conform with the current year’s presentation. For a description of Northern Trust’s significant accounting policies, refer to Note 1 — Summary of Significant Accounting Policies included under Item 8. Financial Statements and Supplementary Data in the Annual Report on Form 10-K for the year ended December 31, 2019.

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Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2020

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

On January 1, 2020, Northern Trust adopted Accounting Standards Update (ASU) No. 2016-13, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (ASU 2016-13). ASU 2016-13 significantly changed the way impairment of financial instruments is recognized by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of financial instruments. The main provisions of ASU 2016-13 include (1) replacing the “incurred loss” approach under current GAAP with an “expected loss” model for instruments measured at amortized cost, (2) requiring entities to record an allowance for available for sale debt securities rather than reduce the carrying amount of the investments, as is required by the other-than-temporary-impairment model under legacy GAAP, and (3) a simplified accounting model for purchased credit-impaired debt securities and loans.

Upon adoption of ASU 2016-13, Northern Trust recorded a $13.7 million increase in the allowance for credit losses with a corresponding cumulative effect adjustment to decrease retained earnings by $10.1 million, net of income taxes, on January 1, 2020. Northern Trust did not restate comparative periods for the effects of applying ASU 2016-13. There was no significant impact to Northern Trust’s consolidated results of operations. Please refer to Note 7 — Allowance for Credit Losses for further information.

On January 1, 2020, Northern Trust adopted ASU No. 2017-04, “Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” (ASU 2017-04). ASU 2017-04 amends the subsequent measurement of goodwill whereby Step 2 from the goodwill impairment test is eliminated. As a result, the goodwill impairment test is performed by comparing the fair value of a reporting unit to its carrying value and an impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to that reporting unit. Upon adoption of ASU 2017-04, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On January 1, 2020, Northern Trust adopted ASU No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement” (ASU 2018-13). The primary objective of ASU 2018-13 is to improve the effectiveness of disclosures in the notes to financial statements. Upon adoption of ASU 2018-13, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On January 1, 2020, Northern Trust adopted ASU No. 2018-15, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force)” (ASU 2018-15). ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). Upon adoption of ASU 2018-15, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On January 1, 2020, Northern Trust adopted ASU No. 2018-17, “Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities” (ASU 2018-17). ASU 2018-17 requires that indirect interests held through related parties in common control arrangements should be considered on a proportional basis (rather than as the equivalent of a direct interest in its entirety) for determining whether fees paid to decision makers and service providers are variable interests. Upon

adoption of ASU 2018-17, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On April 1, 2020, Northern Trust adopted ASU No. 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (ASU 2020-04). The global transition toward alternative reference rates and away from referencing the London Interbank Offered Rate (LIBOR) and other interbank offered rates (Reference Rate Reform) is expected to have a significant impact on the volume of contract modifications, hedge accounting, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of Reference Rate Reform. ASU 2020-04 provides temporary optional expedients and exceptions for applying GAAP to contract modifications, hedging relationships, and other transactions affected by Reference Rate Reform if certain criteria are met. The main provisions of ASU 2020-04 provide the following optional expedients: (1) simplification of the accounting evaluations under current GAAP for contract modifications, including loan, debt, lease and other contracts with potential embedded derivatives, if qualifying criteria are met (2) preservation of hedging relationships without dedesignation upon certain changes to the critical terms of an existing hedging relationship due to Reference Rate Reform and other optional hedge accounting relief provisions and (3) a one-time election to sell or transfer, or both sell and transfer, debt securities classified as held to maturity that reference a rate affected by Reference Rate Reform and are classified as held to maturity before January 1, 2020.

The optional expedients in ASU 2020-04 for contract modifications and hedging relationships are applied prospectively, while the one-time election to sell or transfer, or both sell and transfer debt securities classified as held to maturity may be made at any time after March 12, 2020. The optional expedients and exceptions provided by ASU 2020-04 do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022 for which an entity has elected certain optional expedients and which are retained through the end of the hedging relationship. Upon adoption of ASU 2020-04, there was no significant impact on Northern Trust’s consolidated financial condition or results of operations. Northern Trust expects to elect the optional expedients provided in ASU 2020-04 and does not expect a significant impact on Northern Trust’s consolidated financial condition or results of operations as a result of electing such expedients.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Fair Value Hierarchy. The following describes the hierarchy of valuation inputs (Levels 1, 2, and 3) used to measure fair value and the primary valuation methodologies used by Northern Trust for financial instruments measured at fair value on a recurring basis. Observable inputs reflect market data obtained from sources independent of the reporting entity; unobservable inputs reflect the entity’s own assumptions about how market participants would value an asset or liability based on the best information available. GAAP requires an entity measuring fair value to maximize the use of observable inputs and minimize the use of unobservable inputs and establishes a fair value hierarchy of inputs. Financial instruments are categorized within the hierarchy based on the lowest level input that is significant to their valuation. No transfers into or out of Level 3 occurred during the nine months ended September 30, 2020 or the twelve months ended December 31, 2019.

Level 1 — Quoted, active market prices for identical assets or liabilities.

Northern Trust’s Level 1 assets are comprised of available for sale investments in U.S. Treasury securities.

Level 2 — Observable inputs other than Level 1 prices, such as quoted active market prices for similar assets or liabilities, quoted prices for identical or similar assets in inactive markets, and model-derived valuations in which all significant inputs are observable in active markets.

Northern Trust’s Level 2 assets include available for sale and trading account debt securities, the fair values of which are determined predominantly by external pricing vendors. Prices received from vendors are compared to other vendor and third-party prices. If a security price obtained from a pricing vendor is determined to exceed pre-determined tolerance levels that are assigned based on an asset type’s characteristics, the exception is researched and, if the price is not able to be validated, an alternate pricing vendor is utilized, consistent with Northern Trust’s pricing source hierarchy. As of September 30, 2020, Northern Trust’s available for sale debt securities portfolio included 2,086 Level 2 debt securities with an aggregate market value of $38.4 billion. All 2,086 debt securities were valued by external pricing vendors. As of December 31, 2019, Northern Trust’s available for sale debt securities portfolio included 1,704 Level 2 debt securities with an aggregate market value of $34.3 billion. All 1,704 debt securities were valued by external pricing vendors. Trading account debt securities, which totaled $0.6 million and $0.3 million as of September 30, 2020 and December 31, 2019, respectively, were all valued using external pricing vendors.

Level 2 assets and liabilities also include derivative contracts which are valued internally using widely accepted income-based models that incorporate inputs readily observable in actively quoted markets and reflect the contractual terms of the contracts. Observable inputs include foreign exchange rates and interest rates for foreign exchange contracts; credit spreads, default probabilities, and recovery rates for credit default swap contracts; interest rates for interest rate swap contracts and forward contracts; and interest rates and volatility inputs for interest rate option contracts. Northern Trust evaluates the impact of counterparty credit risk and its own credit risk on the valuation of its derivative instruments. Factors considered include the likelihood of default by Northern Trust and its counterparties, the remaining maturities of the instruments, net exposures after giving effect to master netting arrangements or similar agreements, available collateral, and other credit enhancements in determining the appropriate fair value of derivative instruments. The resulting valuation adjustments have not been considered material.

Level 3 — Valuation techniques in which one or more significant inputs are unobservable in the marketplace.

Northern Trust’s Level 3 liabilities consist of swaps that Northern Trust entered into with the purchaser of 1.1 million and 1.0 million shares of Visa Inc. Class B common stock (Visa Class B common shares) previously held by Northern Trust and sold in June 2016 and 2015, respectively. Pursuant to the swaps, Northern Trust retains the risks associated with the ultimate conversion of the Visa Class B common shares into shares of Visa Inc. Class A common stock (Visa Class A common shares), such that the counterparty will be compensated for any dilutive adjustments to the conversion ratio and Northern Trust will be compensated for any anti-dilutive adjustments to the ratio. The swaps also require periodic payments from Northern Trust to the counterparty calculated by reference to the market price of Visa Class A common shares and a fixed rate of interest. The fair value of the swaps is determined using a discounted cash flow methodology. The significant unobservable inputs used in the fair value measurement are Northern Trust’s own assumptions about estimated changes in the conversion rate of the Visa Class B common shares into Visa Class A common shares, the date on which such conversion is expected to occur and the estimated growth rate of the Visa Class A common share price. See “Visa Class B Common Shares” under Note 19 — Commitments and Contingent Liabilities for further information.

Northern Trust believes its valuation methods for its assets and liabilities carried at fair value are appropriate; however, the use of different methodologies or assumptions, particularly as applied to Level 3 assets and liabilities, could have a material effect on the computation of their estimated fair values.

The following table presents the fair values of Northern Trust’s Level 3 liabilities as of September 30, 2020 and December 31, 2019, as well as the valuation techniques, significant unobservable inputs, and quantitative information used to develop significant unobservable inputs for such liabilities as of such dates.

TABLE 36: LEVEL 3 SIGNIFICANT UNOBSERVABLE INPUTS

	SEPTEMBER 30, 2020
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$32.3 million	Discounted Cash Flow	Conversion Rate	1.62x			1.62x
			Visa Class A Appreciation	8.70%			8.70%
			Expected Duration	12	-	33 months	20 months

⁽¹⁾ Weighted average of expected duration based on scenario probability.

	DECEMBER 31, 2019
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$33.4 million	Discounted Cash Flow	Conversion Rate	1.62x			1.62x
			Visa Class A Appreciation	8.54%			8.54%
			Expected Duration	12	-	36 months	22 months

⁽¹⁾ Weighted average of expected duration based on scenario probability.

The following table presents assets and liabilities measured at fair value on a recurring basis as of September 30, 2020 and December 31, 2019, segregated by fair value hierarchy level.

TABLE 37: RECURRING BASIS HIERARCHY LEVELING

	SEPTEMBER 30, 2020
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	4,165.2	$	—	$	—	$	—	$	4,165.2
Obligations of States and Political Subdivisions	—		2,600.5		—		—		2,600.5
Government Sponsored Agency	—		24,568.8		—		—		24,568.8
Non-U.S. Government	—		937.6		—		—		937.6
Corporate Debt	—		2,627.4		—		—		2,627.4
Covered Bonds	—		516.8		—		—		516.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,552.8		—		—		2,552.8
Other Asset-Backed	—		3,559.4		—		—		3,559.4
Commercial Mortgage-Backed	—		1,015.2		—		—		1,015.2
Other	—		7.3		—		—		7.3
Total Available for Sale	4,165.2		38,385.8		—		—		42,551.0
Trading Account	0.3		0.3		—		—		0.6
Total Available for Sale and Trading Debt Securities	4,165.5		38,386.1		—		—		42,551.6
Other Assets
Derivative Assets
Foreign Exchange Contracts	—		2,279.5		—		(1,405.7)		873.8
Interest Rate Contracts	—		333.7		—		(2.6)		331.1
Total Derivative Assets	—		2,613.2		—		(1,408.3)		1,204.9
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		2,326.3		—		(1,493.6)		832.7
Interest Rate Contracts	—		142.2		—		(109.7)		32.5
Other Financial Derivatives(1)	—		—		32.3		—		32.3
Total Derivative Liabilities	$	—	$	2,468.5	$	32.3	$	(1,603.3)	$	897.5

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of September 30, 2020, derivative assets and liabilities shown above also include reductions of $212.7 million and $407.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

⁽¹⁾This line consists of swaps related to the sale of certain Visa Class B common shares.

	DECEMBER 31, 2019
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	4,549.1	$	—	$	—	$	—	$	4,549.1
Obligations of States and Political Subdivisions	—		1,615.3		—		—		1,615.3
Government Sponsored Agency	—		23,271.2		—		—		23,271.2
Non-U.S. Government	—		3.3		—		—		3.3
Corporate Debt	—		2,402.7		—		—		2,402.7
Covered Bonds	—		769.9		—		—		769.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,127.6		—		—		2,127.6
Other Asset-Backed	—		3,330.5		—		—		3,330.5
Commercial Mortgage-Backed	—		797.7		—		—		797.7
Other	—		9.0		—		—		9.0
Total Available for Sale	4,549.1		34,327.2		—		—		38,876.3
Trading Account	—		0.3		—		—		0.3
Total Available for Sale and Trading Debt Securities	4,549.1		34,327.5		—		—		38,876.6
Other Assets
Derivative Assets
Foreign Exchange Contracts	—		3,234.8		—		(2,334.1)		900.7
Interest Rate Contracts	—		152.9		—		(3.9)		149.0
Total Derivative Assets	—		3,387.7		—		(2,338.0)		1,049.7
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		3,182.2		—		(1,548.6)		1,633.6
Interest Rate Contracts	—		97.4		—		(57.3)		40.1
Other Financial Derivatives(1)	—		—		33.4		(12.5)		20.9
Total Derivative Liabilities	$	—	$	3,279.6	$	33.4	$	(1,618.4)	$	1,694.6

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2019, derivative assets and liabilities shown above also include reductions of $1,136.8 million and $417.2 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

⁽¹⁾ This line consists of swaps related to the sale of certain Visa Class B common shares.

The following table presents the changes in Level 3 liabilities for the three and nine months ended September 30, 2020 and 2019.

TABLE 38: CHANGES IN LEVEL 3 LIABILITIES

(In Millions)	SWAPS RELATED TO SALE OF CERTAIN VISA CLASS B COMMON SHARES
THREE MONTHS ENDED SEPTEMBER 30,	2020		2019
Fair Value at July 1	$	31.3	$	34.7
Total (Gains) Losses:
Included in Earnings(1)	5.3		6.7
Purchases, Issues, Sales, and Settlements
Settlements	(4.3)		(3.7)
Fair Value at September 30	$	32.3	$	37.7

⁽¹⁾ (Gains) losses are recorded in Other Operating Income on the consolidated statements of income.

NINE MONTHS ENDED SEPTEMBER 30,	2020		2019
Fair Value at January 1	$	33.4	$	32.8
Total (Gains) Losses:
Included in Earnings(1)	11.0		14.9
Purchases, Issues, Sales, and Settlements
Settlements	(12.1)		(10.0)
Fair Value at September 30	$	32.3	$	37.7

⁽¹⁾ (Gains) losses are recorded in Other Operating Income on the consolidated statements of income.

Carrying values of assets and liabilities that are not measured at fair value on a recurring basis may be adjusted to fair value in periods subsequent to their initial recognition, for example, to record an impairment of an asset. GAAP requires entities to separately disclose these subsequent fair value measurements and to classify them under the fair value hierarchy.

Assets measured at fair value on a nonrecurring basis at September 30, 2020 and December 31, 2019, all of which were categorized as Level 3 under the fair value hierarchy, were comprised of nonaccrual loans whose values were based on real estate and other available collateral, and of other real estate owned (OREO) properties.

Fair values of real estate loan collateral were estimated using a market approach typically supported by third-party valuations and property-specific fees and taxes. The fair values of real estate loan collateral were subject to adjustments to reflect management’s judgment as to realizable value and consisted of discount factors ranging from 15.0% to 20.0% with a weighted average based on fair values of 15.2% and 15.3% as of September 30, 2020 and December 31, 2019, respectively. Other loan collateral, which typically consists of accounts receivable, inventory and equipment, is valued using a market approach adjusted for asset-specific characteristics and in limited instances third-party valuations are used. OREO assets are carried at the lower of cost or fair value less estimated costs to sell, with fair value typically based on third-party appraisals.

Collateral-based nonaccrual loans that have been adjusted to fair value totaled $21.2 million and $8.0 million at September 30, 2020 and December 31, 2019, respectively.

The following table presents the fair values of Northern Trust’s Level 3 assets that were measured at fair value on a nonrecurring basis as of September 30, 2020 and December 31, 2019, as well as the valuation technique, significant unobservable inputs and quantitative information used to develop the significant unobservable inputs for such assets as of such dates.

TABLE 39: LEVEL 3 NONRECURRING BASIS SIGNIFICANT UNOBSERVABLE INPUTS

	SEPTEMBER 30, 2020
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES
Loans	$21.2 million	Market Approach	Discount factor applied to real estate collateral-based loans to reflect realizable value	15.0%	-	20.0%	15.2%

⁽¹⁾ Includes real estate collateral-based loans and other collateral-based loans.

	DECEMBER 31, 2019
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES				WEIGHTED-AVERAGE INPUT VALUES
Loans	$8.0 million	Market Approach	Discount factor applied to real estate collateral-based loans to reflect realizable value	15.0	%	-	20.0%	15.3%

⁽¹⁾ Includes real estate collateral-based loans and other collateral-based loans.

The following table summarizes the fair values of all financial instruments.

TABLE 40: FAIR VALUE OF FINANCIAL INSTRUMENTS

	SEPTEMBER 30, 2020
					FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
ASSETS
Cash and Due from Banks	$	4,737.5	$	4,737.5	$	4,737.5	$	—	$	—
Federal Reserve and Other Central Bank Deposits	39,244.6		39,244.6		—		39,244.6		—
Interest-Bearing Deposits with Banks	2,754.4		2,754.4		—		2,754.4		—
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,533.4		1,533.4		—		1,533.4		—
Debt Securities
Available for Sale(1)	42,551.0		42,551.0		4,165.2		38,385.8		—
Held to Maturity	16,754.0		16,746.5		99.0		16,647.5		—
Trading Account	0.6		0.6		0.3		0.3		—
Loans (excluding Leases)
Held for Investment	32,521.2		33,001.4		—		—		33,001.4
Client Security Settlement Receivables	2,296.8		2,296.8		—		2,296.8		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	239.7		239.7		—		239.7		—
Community Development Investments	761.3		761.3		—		761.3		—
Employee Benefit and Deferred Compensation	214.6		230.0		143.6		86.4		—
LIABILITIES
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	$	59,756.8	$	59,756.8	$	59,756.8	$	—	$	—
Savings Certificates and Other Time	1,486.7		1,496.5		—		1,496.5		—
Non U.S. Offices Interest-Bearing	61,345.6		61,345.6		—		61,345.6		—
Federal Funds Purchased	2,203.7		2,203.7		—		2,203.7		—
Securities Sold Under Agreements to Repurchase	269.8		269.8		—		269.8		—
Other Borrowings	5,771.7		5,772.9		—		5,772.9		—
Senior Notes	3,655.6		3,731.0		—		3,731.0		—
Long-Term Debt
Subordinated Debt	1,196.0		1,250.0		—		1,250.0		—
Floating Rate Capital Debt	277.7		255.6		—		255.6		—
Other Liabilities
Standby Letters of Credit	23.9		23.9		—		—		23.9
Loan Commitments	55.7		55.7		—		—		55.7
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	36.8	$	36.8	$	—	$	36.8	$	—
Liabilities	112.8		112.8		—		112.8		—
Interest Rate Contracts
Assets	10.5		10.5		—		10.5		—
Liabilities	18.9		18.9		—		18.9		—
Other Financial Derivatives
Liabilities(2)	32.3		32.3		—		—		32.3
Client-Related and Trading
Foreign Exchange Contracts
Assets	2,242.7		2,242.7		—		2,242.7		—
Liabilities	2,213.5		2,213.5		—		2,213.5		—
Interest Rate Contracts
Assets	323.2		323.2		—		323.2		—
Liabilities	123.3		123.3		—		123.3		—

⁽¹⁾ Refer to the table located on page 46 for the disaggregation of available for sale debt securities.

⁽²⁾ This line consists of swaps related to the sale of certain Visa Class B common shares.

	DECEMBER 31, 2019
					FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
ASSETS
Cash and Due from Banks	$	4,459.2	$	4,459.2	$	4,459.2	$	—	$	—
Federal Reserve and Other Central Bank Deposits	33,886.0		33,886.0		—		33,886.0		—
Interest-Bearing Deposits with Banks	4,877.1		4,877.1		—		4,877.1		—
Federal Funds Sold and Securities Purchased under Agreements to Resell	712.8		712.8		—		712.8		—
Debt Securities
Available for Sale(1)	38,876.3		38,876.3		4,549.1		34,327.2		—
Held to Maturity	12,284.5		12,249.3		138.8		12,110.5		—
Trading Account	0.3		0.3		—		0.3		—
Loans (excluding Leases)
Held for Investment	31,239.5		31,517.8		—		—		31,517.8
Client Security Settlement Receivables	845.7		845.7		—		845.7		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	301.2		301.2		—		301.2		—
Community Development Investments	749.3		749.3		—		749.3		—
Employee Benefit and Deferred Compensation	199.5		207.6		131.0		76.6		—
LIABILITIES
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	$	47,733.6	$	47,733.6	$	47,733.6	$	—	$	—
Savings Certificates and Other Time	986.7		994.2		—		994.2		—
Non U.S. Offices Interest-Bearing	60,400.3		60,400.3		—		60,400.3		—
Federal Funds Purchased	552.9		552.9		—		552.9		—
Securities Sold Under Agreements to Repurchase	489.7		489.7		—		489.7		—
Other Borrowings	6,744.8		6,745.9		—		6,745.9		—
Senior Notes	2,573.0		2,593.0		—		2,593.0		—
Long-Term Debt
Subordinated Debt	1,148.1		1,169.5		—		1,169.5		—
Floating Rate Capital Debt	277.7		262.1		—		262.1		—
Other Liabilities
Standby Letters of Credit	25.5		25.5		—		—		25.5
Loan Commitments	32.3		32.3		—		—		32.3
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	83.1	$	83.1	$	—	$	83.1	$	—
Liabilities	24.1		24.1		—		24.1		—
Interest Rate Contracts
Assets	20.5		20.5		—		20.5		—
Liabilities	21.1		21.1		—		21.1		—
Other Financial Derivatives
Liabilities(2)	33.4		33.4		—		—		33.4
Client-Related and Trading
Foreign Exchange Contracts
Assets	3,151.7		3,151.7		—		3,151.7		—
Liabilities	3,158.1		3,158.1		—		3,158.1		—
Interest Rate Contracts
Assets	132.4		132.4		—		132.4		—
Liabilities	76.3		76.3		—		76.3		—

⁽¹⁾ Refer to the table located on page 47 for the disaggregation of available for sale debt securities.    

⁽²⁾ This line consists of swaps related to the sale of certain Visa Class B common shares.

XML

Securities

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Securities

Securities

Debt Securities Available for Sale. The following tables provide the amortized cost and fair values at September 30, 2020 and December 31, 2019, and remaining maturities of debt securities available for sale at September 30, 2020.

TABLE 41: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF DEBT SECURITIES AVAILABLE FOR SALE

	SEPTEMBER 30, 2020
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	4,083.9	$	81.3	$	—	$	4,165.2
Obligations of States and Political Subdivisions	2,465.2		136.3		1.0		2,600.5
Government Sponsored Agency	24,162.6		427.4		21.2		24,568.8
Non-U.S. Government	936.8		0.9		0.1		937.6
Corporate Debt	2,548.7		80.9		2.2		2,627.4
Covered Bonds	508.5		8.3		—		516.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,486.4		66.7		0.3		2,552.8
Other Asset-Backed	3,522.3		46.6		9.5		3,559.4
Commercial Mortgage-Backed	937.5		78.4		0.7		1,015.2
Other	7.3		—		—		7.3
Total	$	41,659.2	$	926.8	$	35.0	$	42,551.0

	DECEMBER 31, 2019
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	4,527.5	$	26.7	$	5.1	$	4,549.1
Obligations of States and Political Subdivisions	1,604.0		24.6		13.3		1,615.3
Government Sponsored Agency	23,247.5		101.8		78.1		23,271.2
Non-U.S. Government	3.3		—		—		3.3
Corporate Debt	2,378.9		27.8		4.0		2,402.7
Covered Bonds	766.3		4.4		0.8		769.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,091.3		37.4		1.1		2,127.6
Other Asset-Backed	3,324.5		11.3		5.3		3,330.5
Commercial Mortgage-Backed	769.9		28.7		0.9		797.7
Other	9.0		—		—		9.0
Total	$	38,722.2	$	262.7	$	108.6	$	38,876.3

TABLE 42: REMAINING MATURITY OF DEBT SECURITIES AVAILABLE FOR SALE

SEPTEMBER 30, 2020	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE
U.S. Government	$	1,802.3	$	1,805.4	$	1,834.8	$	1,876.1	$	446.8	$	483.7	$	—	$	—	$	4,083.9	$	4,165.2
Obligations of States and Political Subdivisions	16.4		16.4		210.9		222.8		2,187.7		2,311.0		50.2		50.3		2,465.2		2,600.5
Government Sponsored Agency	6,077.0		6,160.5		9,520.9		9,669.4		6,111.1		6,224.2		2,453.6		2,514.7		24,162.6		24,568.8
Non-U.S. Government	737.9		738.2		40.7		40.6		158.2		158.8		—		—		936.8		937.6
Corporate Debt	547.1		552.9		2,001.6		2,074.5		—		—		—		—		2,548.7		2,627.4
Covered Bonds	24.4		24.5		484.1		492.3		—		—		—		—		508.5		516.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	334.9		335.1		2,046.0		2,111.8		105.5		105.9		—		—		2,486.4		2,552.8
Other Asset-Backed	412.4		419.0		2,658.0		2,690.0		356.0		354.5		95.9		95.9		3,522.3		3,559.4
Commercial Mortgage-Backed	16.6		16.7		336.2		360.3		567.1		620.6		17.6		17.6		937.5		1,015.2
Other	7.3		7.3		—		—		—		—		—		—		7.3		7.3
Total	$	9,976.3	$	10,076.0	$	19,133.2	$	19,537.8	$	9,932.4	$	10,258.7	$	2,617.3	$	2,678.5	$	41,659.2	$	42,551.0

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

Debt Securities Available for Sale with Unrealized Losses. The following table provides information regarding debt securities available for sale with no credit losses reported that had been in a continuous unrealized loss position for less than twelve months and for twelve months or longer as of September 30, 2020 and December 31, 2019.

TABLE 43: DEBT SECURITIES AVAILABLE FOR SALE IN UNREALIZED LOSS POSITION WITH NO CREDIT LOSSES REPORTED

AS OF SEPTEMBER 30, 2020	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
Obligations of States and Political Subdivisions	$	230.4	$	1.0	$	—	$	—	$	230.4	$	1.0
Government Sponsored Agency	2,578.6		6.8		2,862.3		14.4		5,440.9		21.2
Non-U.S. Government	26.5		0.1		—		—		26.5		0.1
Corporate Debt	69.1		1.0		76.1		1.2		145.2		2.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	146.3		0.2		158.7		0.1		305.0		0.3
Other Asset-Backed	631.2		1.0		846.3		8.5		1,477.5		9.5
Commercial Mortgage-Backed	76.3		0.7		—		—		76.3		0.7
Total	$	3,758.4	$	10.8	$	3,943.4	$	24.2	$	7,701.8	$	35.0

AS OF DECEMBER 31, 2019	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
U.S. Government	$	252.2	$	2.8	$	899.7	$	2.3	$	1,151.9	$	5.1
Obligations of States and Political Subdivisions	902.4		13.3		—		—		902.4		13.3
Government Sponsored Agency	5,405.0		35.6		7,818.4		42.5		13,223.4		78.1
Corporate Debt	279.3		1.1		492.7		2.9		772.0		4.0
Covered Bonds	138.7		0.7		25.0		0.1		163.7		0.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	217.5		1.0		155.2		0.1		372.7		1.1
Other Asset-Backed	592.4		1.8		1,164.9		3.5		1,757.3		5.3
Commercial Mortgage-Backed	62.8		0.7		59.3		0.2		122.1		0.9
Total	$	7,850.3	$	57.0	$	10,615.2	$	51.6	$	18,465.5	$	108.6

As of September 30, 2020, 475 debt securities available for sale with a combined fair value of $7.7 billion were in an unrealized loss position, with their unrealized losses totaling $35.0 million. Unrealized losses related to debt securities available for sale of $21.2 million and $9.5 million related to government-sponsored agency and other asset-backed securities, respectively, are primarily attributable to changes in market interest rates and credit spreads since their purchase. Unrealized losses related to corporate debt securities with no credit losses reported of $2.2 million are primarily attributable to changes in market interest rates as well as credit spreads since their purchase. As of September 30, 2020, 21% of the corporate debt securities available for sale portfolio were backed by guarantees provided by U.S. and non-U.S. governmental entities. The remaining unrealized losses on Northern Trust’s debt securities available for sale portfolio as of September 30, 2020, are attributable to changes in overall market interest rates or credit spreads.

As of September 30, 2020, Northern Trust did not intend to sell any debt securities available for sale in an unrealized loss position and it was more likely than not that Northern Trust would not be required to sell any such investment before the recovery of its amortized cost basis, which may be maturity.

Debt securities available for sale impairment reviews are conducted quarterly to identify and evaluate securities that have indications of possible credit losses. A determination as to whether a security’s decline in market value is related to credit impairment takes into consideration numerous factors and the relative significance of any single factor can vary by security. Factors Northern Trust considers in determining whether impairment is credit related include, but are not limited to, the severity of the impairment; the cause of the impairment and the financial condition and near-term prospects of the issuer; activity in the market of the issuer, which may indicate adverse credit conditions; Northern Trust’s intent regarding the sale of the security as of the balance sheet date; and the likelihood that Northern Trust will not be required to sell the security for a period of time sufficient to allow for the recovery of the security’s amortized cost basis. For each security meeting the requirements of Northern Trust’s internal screening process, an extensive review is conducted to determine if a credit loss has occurred.

There was no provision for corporate debt securities available for sale for the three and nine months ended September 30, 2020 and no allowance for credit losses for corporate debt securities available for sale as of September 30, 2020. The process for identifying credit losses for corporate debt available for sale securities is based on the best estimate of cash flows to be collected from the security, discounted using the security’s effective interest rate. If the present value of the expected cash flows is found to be less than the current amortized cost of the security, an allowance for credit losses is generally recorded equal to the difference between the two amounts, limited to the amount the amortized cost basis exceeds the fair value of the security. For additional information, please refer to Note 7 — Allowance for Credit Losses.

For a description of Northern Trust’s accounting policies applied prior to the adoption of ASU 2016-13, refer to Note 1 — Summary of Significant Accounting Policies and Note 4 — Securities included under Item 8. Financial Statements and Supplementary Data in the Annual Report on Form 10-K for the year ended December 31, 2019.

Debt Securities Held to Maturity. The following tables provide the amortized cost and fair values at September 30, 2020 and December 31, 2019, and remaining maturities of debt securities held to maturity at September 30, 2020.

TABLE 44: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF DEBT SECURITIES HELD TO MATURITY

	SEPTEMBER 30, 2020
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S Government	$	99.0	$	—	$	—	$	99.0
Obligations of States and Political Subdivisions	2.6		0.1		—		2.7
Government Sponsored Agency	3.4		0.3		—		3.7
Non-U.S. Government	7,551.8		8.1		0.2		7,559.7
Corporate Debt	530.3		5.5		—		535.8
Covered Bonds	3,361.7		25.4		1.0		3,386.1
Certificates of Deposit	726.3		—		—		726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	3,390.5		42.8		0.3		3,433.0
Other Asset-Backed	645.8		0.7		0.2		646.3
Other	442.6		—		88.7		353.9
Total	$	16,754.0	$	82.9	$	90.4	$	16,746.5

	DECEMBER 31, 2019
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	138.8	$	—	$	—	$	138.8
Obligations of States and Political Subdivisions	10.1		0.2		—		10.3
Government Sponsored Agency	4.1		0.2		—		4.3
Non-U.S. Government	4,076.0		5.3		2.5		4,078.8
Corporate Debt	405.1		1.4		0.3		406.2
Covered Bonds	3,006.7		16.1		2.4		3,020.4
Certificates of Deposit	262.9		—		—		262.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	3,285.4		21.7		2.1		3,305.0
Other Asset-Backed	804.3		0.7		0.3		804.7
Other	291.1		0.1		73.3		217.9
Total	$	12,284.5	$	45.7	$	80.9	$	12,249.3

As of September 30, 2020, the $16.8 billion debt securities held to maturity portfolio had an unrealized loss of $88.7 million related to other residential mortgage-backed securities, which are primarily attributable to changes in overall market interest rates and credit spreads since their purchase.

TABLE 45: REMAINING MATURITY OF DEBT SECURITIES HELD TO MATURITY

SEPTEMBER 30, 2020	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
U.S. Government	$	99.0	$	99.0	$	—	$	—	$	—	$	—	$	—	$	—	$	99.0	$	99.0
Obligations of States and Political Subdivisions	1.6		1.6		1.0		1.1		—		—		—		—		2.6		2.7
Government Sponsored Agency	0.5		0.6		1.5		1.6		0.9		1.0		0.5		0.5		3.4		3.7
Non-U.S. Government	7,291.5		7,293.2		260.3		266.5		—		—		—		—		7,551.8		7,559.7
Corporate Debt	125.0		125.2		405.3		410.6		—		—		—		—		530.3		535.8
Covered Bonds	1,228.1		1,233.1		2,133.6		2,153.0		—		—		—		—		3,361.7		3,386.1
Certificates of Deposit	726.3		726.3		—		—		—		—		—		—		726.3		726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	832.7		837.1		2,325.2		2,362.7		232.6		233.2		—		—		3,390.5		3,433.0
Other Asset-Backed	190.1		190.1		435.4		435.8		20.3		20.4		—		—		645.8		646.3
Other	21.3		20.8		251.4		228.1		58.9		49.4		111.0		55.6		442.6		353.9
Total	$	10,516.1	$	10,527.0	$	5,813.7	$	5,859.4	$	312.7	$	304.0	$	111.5	$	56.1	$	16,754.0	$	16,746.5

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

Debt securities held to maturity consist of securities that management intends to, and Northern Trust has the ability to, hold until maturity. During the three months ended September 30, 2020, no securities were transferred from available for sale to held to maturity. During the nine months ended September 30, 2020, $301.5 million securities reflected in U.S. government were transferred from available for sale to held to maturity, all of which were transferred in the second quarter of 2020. During the three and nine months ended September 30, 2019, $160.8 million securities reflected in covered bonds were transferred from available for sale to held to maturity.

Credit Quality Indicators. The following table provides the amortized cost of debt securities held to maturity by credit rating.

TABLE 46: AMORTIZED COST OF DEBT SECURITIES HELD TO MATURITY BY CREDIT RATING

	AS OF SEPTEMBER 30, 2020
(In Millions)	AAA		AA		A		BBB		NOT RATED		TOTAL
U.S. Government	$	99.0	$	—	$	—	$	—	$	—	$	99.0
Obligations of States and Political Subdivisions	—		0.6		0.7		1.3		—		2.6
Government Sponsored Agency	3.4		—		—		—		—		3.4
Non-U.S. Government	335.6		1,269.7		5,899.8		46.7		—		7,551.8
Corporate Debt	3.6		254.7		272.0		—		—		530.3
Covered Bonds	3,361.7		—		—		—		—		3,361.7
Certificates of Deposit	—		—		—		—		726.3		726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,423.6		966.9		—		—		—		3,390.5
Other Asset-Backed	645.8		—		—		—		—		645.8
Other	—		—		—		—		442.6		442.6
Total	$	6,872.7	$	2,491.9	$	6,172.5	$	48.0	$	1,168.9	$	16,754.0

Credit quality indicators are metrics that provide information regarding the relative credit risk of debt securities. Northern Trust maintains a high quality debt securities portfolio, with 41% of the held to maturity portfolio at September 30, 2020, composed of U.S. Treasury and government sponsored agency securities and other triple-A rated securities. The remaining held to maturity debt securities portfolio was comprised of 15% rated double-A, 37% rated below double-A, and 7% not rated by Moody’s Investors Service, Standard and Poor’s or Fitch Ratings. Securities not explicitly rated were grouped where possible under the credit rating of the issuer of the security.

Investment Security Gains and Losses. There were no sales of debt securities during the three months ended September 30, 2020. Proceeds of $689.2 million from the sale of debt securities during the nine months ended September 30, 2020 and $177.3 million and $406.6 million from the sale of debt securities during the three- and nine- months ended September 30, 2019, respectively, resulted in the following gains and losses shown below.

TABLE 47: INVESTMENT SECURITY GAINS AND LOSSES

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Gross Realized Debt Securities Gains	$	—	$	0.1	$	3.4	$	1.6
Gross Realized Debt Securities Losses	—		(0.4)		(3.3)		(2.2)
Changes in Other-Than-Temporary Impairment Losses(1)	—		(0.1)		—		(0.3)
Net Investment Security (Losses) Gains	$	—	$	(0.4)	$	0.1	$	(0.9)

(1) Other-than-temporary impairment losses relate to certain Community Reinvestment Act (CRA) eligible held to maturity debt securities.

XML

Securities Sold Under Agreements to Repurchase

9 Months Ended

Sep. 30, 2020

Banking and Thrift, Other Disclosures [Abstract]

Securities Sold Under Agreements to Repurchase

Securities Sold Under Agreements to Repurchase

Securities sold under agreements to repurchase are accounted for as collateralized financings and recorded at the amounts at which the securities were sold plus accrued interest. To minimize any potential credit risk associated with these transactions, the fair value of the securities sold is monitored, limits are set on exposure with counterparties, and the financial condition of counterparties is regularly assessed. Securities sold under agreements to repurchase are held by the counterparty until the repurchase.

The following table provides information regarding repurchase agreements that are accounted for as secured borrowings as of September 30, 2020 and December 31, 2019.

TABLE 48: REPURCHASE AGREEMENTS ACCOUNTED FOR AS SECURED BORROWINGS

	REMAINING CONTRACTUAL MATURITY OF THE AGREEMENTS
	OVERNIGHT AND CONTINUOUS
($ In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
U.S. Treasury and Agency Securities	$	269.8	$	489.7
Total Borrowings	269.8		489.7
Gross Amount of Recognized Liabilities for Repurchase Agreements in Note 21	269.8		489.7
Amounts related to agreements not included in Note 21	—		—

XML

Loans and Leases

9 Months Ended

Sep. 30, 2020

Receivables [Abstract]

Loans and Leases

Loans and Leases

Amounts outstanding for loans and leases, by segment and class, are shown in the following table. During the first quarter of 2020, the Corporation implemented a change in the classification of certain loans and leases to specific segments to enhance the consistency of its reporting across various regulatory regimes. As a result, the loan and lease balances as of December 31, 2019 below have been adjusted to conform to the presentation for periods ended after such date. The adjustments generally reflect reclassification of loans from the commercial real estate class to commercial and institutional, residential real estate, and private client classes. There was no impact on total loans and leases previously reported.

TABLE 49: LOANS AND LEASES

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Commercial
Commercial and Institutional	$	9,524.0	$	9,091.1
Commercial Real Estate	3,373.6		3,104.3
Non-U.S.	1,441.0		1,576.3
Lease Financing, net	30.1		65.6
Other	213.0		164.0
Total Commercial	14,581.7		14,001.3
Personal
Private Client	11,893.0		11,071.4
Residential Real Estate	5,928.3		6,095.0
Non-U.S.	338.7		174.8
Other	24.6		67.1
Total Personal	18,184.6		17,408.3
Total Loans and Leases	$	32,766.3	$	31,409.6

Residential real estate loans consist of traditional first lien mortgages and equity credit lines that generally require a loan-to-collateral value of no more than 65% to 80% at inception. Northern Trust’s equity credit line products generally have draw periods of up to 10 years and a balloon payment of any outstanding balance is due at maturity. Payments are interest-only with variable interest rates. Northern Trust does not offer equity credit lines that include an option to convert the outstanding balance to an amortizing payment loan. As of September 30, 2020 and December 31, 2019, equity credit lines totaled $351.8 million and $448.5 million, respectively, and equity credit lines for which first liens were held by Northern Trust represented 97% of the total equity credit lines as of both September 30, 2020 and December 31, 2019.

Included within the non-U.S., commercial-other and personal-other classes are short-duration advances primarily related to the processing of custodied client investments, totaling $1.3 billion at September 30, 2020 and $1.1 billion at December 31, 2019, respectively. Demand deposit overdrafts reclassified as loan balances totaled $11.6 million and $90.4 million at September 30, 2020 and December 31, 2019, respectively.

As of September 30, 2020 and December 31, 2019, there were $18.6 million and $53.6 million of leases, respectively, classified as held for sale related to the decision to sell substantially all of the lease portfolio. As of September 30, 2020 and December 31, 2019, there were no loans classified as held for sale.

Paycheck Protection Program. In response to the COVID-19 pandemic, Northern Trust became a lender under the Paycheck Protection Program (PPP), which was created by the Coronavirus Aid, Relief, and Economic Security (CARES) Act and is administered by the U.S. Small Business Administration (SBA). Loans issued under the PPP are funded by Northern Trust directly to participating borrowers. The PPP loans are guaranteed by the SBA and borrowers are eligible to apply for PPP loan forgiveness for up to the full principal amount and accrued interest of the PPP loan.

To the extent that the borrower has used the PPP loan proceeds to cover eligible costs and has met all other SBA loan forgiveness requirements, the SBA will determine loan forgiveness under the CARES Act and will pay to Northern Trust the eligible PPP loan forgiven amount, which will be credited to the borrower’s loan to repay or pay down the PPP loan. The SBA forgiveness portal opened on August 10, 2020 and Northern Trust’s vendor portal opened on September 11, 2020 to begin processing the PPP loan forgiveness applications. 109 PPP loan forgiveness applications were in process as of September 30, 2020, though no PPP loans of the total $215.3 million PPP loans had been submitted for forgiveness approval to the SBA as of such date. When Northern Trust submits the forgiveness applications to the SBA, the SBA will have at least 90 days to respond to Northern Trust as to the approval or denial of such application.

As of September 30, 2020, Northern Trust had, net of repayments, $215.3 million or 1,127 loans, under the PPP in the commercial and institutional portfolio with an average loan balance of $0.2 million. As of September 30, 2020, for its origination efforts Northern Trust had received approximately $2.6 million in SBA fees, net of service charges.

Northern Trust accounts for loans originated under the PPP as loan receivables in accordance with Accounting Standards Codification (ASC) 310 and recognizes such loans at the principal amount less the net amount of loan origination fees. PPP loans are reported in Total Loans and Leases on the consolidated balance sheets.

The SBA provides a 100% guarantee on PPP loans covering principal and interest. Northern Trust considers the risk mitigating effects of these guarantees, and accounts for them as a credit enhancement embedded in the contract. As a result, no allowance for credit losses is measured for Northern Trust’s exposure under the PPP.

Credit Quality Indicators. Credit quality indicators are statistics, measurements or other metrics that provide information regarding the relative credit risk of loans and leases. Northern Trust utilizes a variety of credit quality indicators to assess the credit risk of loans and leases at the segment, class, and individual credit exposure levels.

As part of its credit process, Northern Trust utilizes an internal borrower risk rating system to support identification, approval, and monitoring of credit risk. Borrower risk ratings are used in credit underwriting and management reporting. Risk ratings are used for ranking the credit risk of borrowers and the probability of their default. Each borrower is rated using one of a number of ratings models, which consider both quantitative and qualitative factors. The ratings models vary among classes of loans and leases in order to capture the unique risk characteristics inherent within each particular type of credit exposure. Provided below are the more significant performance indicator attributes considered within Northern Trust’s borrower rating models, by loan and lease class.

•Commercial and Institutional: leverage, profit margin, liquidity, asset size and capital levels;

•Commercial Real Estate: debt service coverage, loan-to-value ratio, leasing status and guarantor support;

•Lease Financing and Commercial-Other: leverage, profit margin, liquidity, asset size and capital levels;

•Non-U.S.: leverage, profit margin, liquidity, return on assets and capital levels;

•Residential Real Estate: payment history, credit bureau scores and loan-to-value ratio;

•Private Client: cash-flow-to-debt and net worth ratios, leverage and liquidity; and

•Personal-Other: cash-flow-to-debt and net worth ratios.

While the criteria vary by model, the objective is for the borrower ratings to be consistent in both the measurement and ranking of risk. Each model is calibrated to a master rating scale to support this consistency. Ratings for borrowers not in default range from “1” for the strongest credits to “7” for the weakest non-defaulted credits. Ratings of “8” or “9” are used for defaulted borrowers. Borrower risk ratings are monitored and are revised when events or circumstances indicate a change is required. Risk ratings are generally validated at least annually.

Loan and lease segment and class balances as of September 30, 2020 are provided in the following table, segregated by borrower ratings into “1 to 3,” “4 to 5” and “6 to 9” (watch list and nonaccrual status) categories by year of origination at amortized cost basis. Loans that are held for investment are reported at the principal amount outstanding, net of unearned income.

TABLE 50: CREDIT QUALITY INDICATOR AT AMORTIZED COST BASIS BY ORIGINATION YEAR

September 30, 2020	TERM LOANS AND LEASES												REVOLVING LOANS		REVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)	2020		2019		2018		2017		2016		PRIOR						TOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category	$	245.2	$	571.6	$	208.2	$	142.8	$	457.8	$	465.2	$	3,286.6	$	2.0	$	5,379.4
4 to 5 Category	614.0		579.5		379.7		428.4		143.0		180.4		1,346.4		50.1		3,721.5
6 to 9 Category	36.7		134.7		39.0		29.0		38.5		20.5		124.7		—		423.1
Total Commercial and Institutional	895.9		1,285.8		626.9		600.2		639.3		666.1		4,757.7		52.1		9,524.0
Commercial Real Estate
Risk Rating:
1 to 3 Category	359.5		205.7		71.8		40.5		24.9		113.4		126.5		8.9		951.2
4 to 5 Category	453.4		758.0		294.1		110.6		178.5		383.9		72.4		13.7		2,264.6
6 to 9 Category	7.5		55.2		32.5		32.0		1.6		29.0		—		—		157.8
Total Commercial Real Estate	820.4		1,018.9		398.4		183.1		205.0		526.3		198.9		22.6		3,373.6
Non-U.S.
Risk Rating:
1 to 3 Category	790.8		15.9		10.0		10.7		—		—		32.2		—		859.6
4 to 5 Category	259.5		0.6		2.0		—		—		78.6		37.2		1.8		379.7
6 to 9 Category	0.7		23.1		—		—		—		—		177.9		—		201.7
Total Non-U.S.	1,051.0		39.6		12.0		10.7		—		78.6		247.3		1.8		1,441.0
Lease Financing, net
Risk Rating:
1 to 3 Category	—		—		—		—		—		18.5		—		—		18.5
4 to 5 Category	—		—		—		—		—		11.6		—		—		11.6
6 to 9 Category	—		—		—		—		—		—		—		—		—
Total Lease Financing, net	—		—		—		—		—		30.1		—		—		30.1
Other
Risk Rating:
1 to 3 Category	97.7		—		—		—		—		—		—		—		97.7
4 to 5 Category	115.3		—		—		—		—		—		—		—		115.3
6 to 9 Category	—		—		—		—		—		—		—		—		—
Total Other	213.0		—		—		—		—		—		—		—		213.0
Total Commercial	2,980.3		2,344.3		1,037.3		794.0		844.3		1,301.1		5,203.9		76.5		14,581.7
Personal
Private Client
Risk Rating:
1 to 3 Category	466.3		394.3		56.8		67.6		34.2		150.2		5,087.1		126.1		6,382.6
4 to 5 Category	468.4		493.6		129.6		60.0		78.1		80.9		3,952.3		145.7		5,408.6
6 to 9 Category	5.6		0.5		22.4		3.2		—		—		62.1		8.0		101.8
Total Private Client	940.3		888.4		208.8		130.8		112.3		231.1		9,101.5		279.8		11,893.0
Residential Real Estate
Risk Rating:
1 to 3 Category	1,322.9		396.2		60.9		108.9		254.2		738.0		188.2		1.5		3,070.8
4 to 5 Category	619.8		342.5		126.6		184.2		233.8		904.6		270.2		7.4		2,689.1
6 to 9 Category	13.1		9.4		1.7		0.5		2.7		108.7		32.3		—		168.4
Total Residential Real Estate	1,955.8		748.1		189.2		293.6		490.7		1,751.3		490.7		8.9		5,928.3
Non-U.S.
Risk Rating:
1 to 3 Category	8.6		21.5		—		—		—		1.8		28.2		—		60.1
4 to 5 Category	12.8		22.7		11.9		0.5		0.5		8.2		216.7		5.1		278.4
6 to 9 Category	—		—		—		—		—		0.2		—		—		0.2
Total Non-U.S.	21.4		44.2		11.9		0.5		0.5		10.2		244.9		5.1		338.7
Other
Risk Rating:
1 to 3 Category	5.5		—		—		—		—		—		—		—		5.5
4 to 5 Category	19.1		—		—		—		—		—		—		—		19.1
6 to 9 Category	—		—		—		—		—		—		—		—		—
Total Other	24.6		—		—		—		—		—		—		—		24.6
Total Personal	2,942.1		1,680.7		409.9		424.9		603.5		1,992.6		9,837.1		293.8		18,184.6
Total Loans and Leases	$	5,922.4	$	4,025.0	$	1,447.2	$	1,218.9	$	1,447.8	$	3,293.7	$	15,041.0	$	370.3	$	32,766.3

Loans and leases in the “1 to 3” category are expected to exhibit minimal to modest probabilities of default and are characterized by borrowers having the strongest financial qualities, including above average financial flexibility, cash flows and capital levels. Borrowers assigned these ratings are anticipated to experience very little to moderate financial pressure in adverse down-cycle scenarios. As a result of these characteristics, borrowers within this category exhibit a minimal to modest likelihood of loss.

Loans and leases in the “4 to 5” category are expected to exhibit moderate to acceptable probabilities of default and are characterized by borrowers with less financial flexibility than those in the “1 to 3” category. Cash flows and capital levels are generally sufficient to allow for borrowers to meet current requirements, but have fewer financial resources to manage through economic downturns. As a result of these characteristics, borrowers within this category exhibit a moderate likelihood of loss.

Loans and leases in the watch list category have elevated credit risk profiles that are monitored through internal watch lists, and consist of credits with borrower ratings of “6 to 9.” These credits, which include all nonaccrual credits, are expected to exhibit minimally acceptable probabilities of default, elevated risk of default, or are currently in default. Borrowers associated with these risk profiles that are not currently in default have limited financial flexibility. Cash flows and capital levels range from acceptable to potentially insufficient to meet current requirements, particularly in adverse down cycle scenarios. As a result of these characteristics, borrowers in this category exhibit an elevated to probable likelihood of loss.

For credit quality indicator information that was required under the former provisions of ASC Topic 310, please refer to Note 6 — Loans and Leases included under Item 8. Financial Statements and Supplementary Data in the Annual Report on Form 10-K for the year ended December 31, 2019.

Past Due Status. Past due status is based on the length of time from the contractual due date a principal or interest payment has been past due. For disclosure purposes, loans and leases that are 29 days past due or less are reported as current.

The following table provides balances and delinquency status of accrual and nonaccrual loans and leases by segment and class, as well as the other real estate owned and nonaccrual asset balances, as of September 30, 2020 and December 31, 2019.

TABLE 51: DELINQUENCY STATUS

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS AND LEASES
September 30, 2020
Commercial
Commercial and Institutional	$	9,470.9	$	21.9	$	0.2	$	0.8	$	9,493.8	$	30.2	$	9,524.0	$	11.5
Commercial Real Estate	3,361.0		0.6		8.1		—		3,369.7		3.9		3,373.6		3.9
Non-U.S.	1,441.0		—		—		—		1,441.0		—		1,441.0		—
Lease Financing, net	30.1		—		—		—		30.1		—		30.1		—
Other	213.0		—		—		—		213.0		—		213.0		—
Total Commercial	14,516.0		22.5		8.3		0.8		14,547.6		34.1		14,581.7		15.4
Personal
Private Client	11,832.8		39.4		13.3		7.5		11,893.0		—		11,893.0		—
Residential Real Estate	5,859.9		2.9		1.3		0.3		5,864.4		63.9		5,928.3		55.5
Non-U.S.	338.7		—		—		—		338.7		—		338.7		—
Other	24.6		—		—		—		24.6		—		24.6		—
Total Personal	18,056.0		42.3		14.6		7.8		18,120.7		63.9		18,184.6		55.5
Total Loans and Leases	$	32,572.0	$	64.8	$	22.9	$	8.6	$	32,668.3	$	98.0	$	32,766.3	$	70.9
	Other Real Estate Owned										$	0.9
	Total Nonaccrual Assets										$	98.9

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS AND LEASES
December 31, 2019
Commercial
Commercial and Institutional	$	9,068.3	$	4.1	$	9.9	$	1.2	$	9,083.5	$	7.6	$	9,091.1	$	0.8
Commercial Real Estate	3,089.6		2.3		4.1		4.7		3,100.7		3.6		3,104.3		2.4
Non-U.S.	1,576.3		—		—		—		1,576.3		—		1,576.3		—
Lease Financing, net	65.6		—		—		—		65.6		—		65.6		—
Other	164.0		—		—		—		164.0		—		164.0		—
Total Commercial	13,963.8		6.4		14.0		5.9		13,990.1		11.2		14,001.3		3.2
Personal
Private Client	11,027.9		33.2		9.5		0.3		11,070.9		0.5		11,071.4		0.5
Residential Real Estate	5,997.7		19.8		4.9		1.2		6,023.6		71.4		6,095.0		66.4
Non-U.S	174.1		0.2		—		—		174.3		0.5		174.8		0.5
Other	67.1		—		—		—		67.1		—		67.1		—
Total Personal	17,266.8		53.2		14.4		1.5		17,335.9		72.4		17,408.3		67.4
Total Loans and Leases	$	31,230.6	$	59.6	$	28.4	$	7.4	$	31,326.0	$	83.6	$	31,409.6	$	70.6
	Other Real Estate Owned										$	3.2
	Total Nonaccrual Assets										$	86.8

Recognition of Income. Interest income on loans and leases is recorded on an accrual basis unless, in the opinion of management, there is a question as to the ability of the debtor to meet the terms of the loan agreement, or interest or principal is more than 90 days contractually past due and the loan is not well-secured and in the process of collection. Loans meeting such criteria are classified as nonaccrual and interest income is recorded on a cash basis. At the time a loan is determined to be nonaccrual, interest accrued but not collected is reversed against interest income in the current period. Interest collected on nonaccrual loans is applied to principal unless, in the opinion of management, collectability of principal is not in doubt.

Management’s assessment of the indicators of loan and lease collectability, and its policies relative to the recognition of interest income, including the suspension and subsequent resumption of income recognition, do not meaningfully vary between loan and lease classes. Nonaccrual loans are returned to accrual status when factors indicating doubtful collectability no longer exist. Factors considered in returning a loan to accrual status are consistent across all classes of loans and leases and, in accordance with regulatory guidance, relate primarily to expected payment performance. Loans are eligible to be returned to accrual status when: (i) no principal or interest that is due is unpaid and repayment of the remaining contractual principal and interest is expected or (ii) the loan has otherwise become well-secured (possessing realizable value sufficient to discharge the debt, including accrued interest, in full) and is in the process of collection (through action reasonably expected to result in debt repayment or restoration to a current status in the near future). A loan that has not been brought fully current may be restored to accrual status provided there has been a sustained period of repayment performance (generally a minimum of six payment periods) by the borrower in accordance with the contractual terms, and Northern Trust is reasonably assured of repayment within a reasonable period of time. Additionally, a loan that has been formally restructured so as to be reasonably assured of repayment and performance according to its modified terms may be returned to accrual status, provided there was a well-documented credit evaluation of the borrower’s financial condition and prospects of repayment under the revised terms and there has been a sustained period of repayment performance (generally a minimum of six payment periods) under the revised terms.

Nonaccrual Loans and Troubled Debt Restructurings (TDRs). A loan that has been modified as a concession by Northern Trust or a bankruptcy court resulting from the debtor’s financial difficulties is referred to as a troubled debt restructuring (TDR). All TDRs are reported as TDRs starting in the calendar year of their restructuring. In subsequent years, a TDR may cease being reported as a TDR if the loan was modified at a market rate and has performed according to the modified terms for at least six payment periods. A loan that has been modified at a below market rate will return to accrual status if it satisfies the six-payment-period performance requirement.

The expected credit loss is measured based upon the present value of expected future cash flows, discounted at the effective interest rate based on the original contractual rate. If a loan’s contractual interest rate varies based on subsequent changes in an independent factor, such as an index or rate, the loan’s effective interest rate is calculated based on the factor as it changes over the life of the loan. Northern Trust elected not to project changes in the factor for purposes of estimating expected future cash flows. Further, Northern Trust elected not to adjust the effective interest rate for prepayments. If the loan is collateral dependent, the expected loss is measured based on the fair value of the collateral at the reporting date.

If the loan valuation is less than the recorded value of the loan, either an allowance is established, or a charge-off is recorded, for the difference. Smaller balance (individually less than $1 million) homogeneous loans are collectively evaluated. Northern Trust’s accounting policies for material nonaccrual loans is consistent across all classes of loans and leases.

All loans and leases with TDR modifications are evaluated for additional expected credit losses. The nature and extent of further deterioration in credit quality, including a subsequent default, is considered in the determination of an appropriate level of allowance for credit losses.

Included within nonaccrual loans were $67.5 million and $54.9 million of nonaccrual TDRs, and $33.0 million and $27.7 million of accrual TDRs as of September 30, 2020 and December 31, 2019, respectively.

There were $11.0 million and $8.2 million of aggregate undrawn loan commitments and standby letters of credit at September 30, 2020 and December 31, 2019, respectively, issued to borrowers with TDR modifications of loans.

The following table provides, by segment and class, the number of TDR modifications of loans and leases during the three- and nine- month periods ended September 30, 2020 and 2019, and the recorded investments and unpaid principal balances as of September 30, 2020 and 2019.

TABLE 52: TROUBLED DEBT RESTRUCTURINGS

	THREE MONTHS ENDED SEPTEMBER 30, 2020					NINE MONTHS ENDED SEPTEMBER 30, 2020
($ In Millions)	NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE		NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE
Commercial
Commercial and Institutional	1	$	1.0	$	1.0	3	$	25.3	$	25.5
Total Commercial	1	1.0		1.0		3	25.3		25.5
Personal
Residential Real Estate	10	17.4		17.5		16	18.3		18.7
Total Personal	10	17.4		17.5		16	18.3		18.7
Total Loans and Leases	11	$	18.4	$	18.5	19	$	43.6	$	44.2

Note: Period-end balances reflect all paydowns and charge-offs during the period.

	THREE MONTHS ENDED SEPTEMBER 30, 2019					NINE MONTHS ENDED SEPTEMBER 30, 2019
($ In Millions)	NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE		NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE
Commercial
Commercial and Institutional	—	$	—	$	—	1	$	7.6	$	8.8
Commercial Real Estate	—	—		—		2	—		—
Total Commercial	—	—		—		3	7.6		8.8
Personal
Residential Real Estate	5	3.1		3.1		31	20.6		20.8
Total Personal	5	3.1		3.1		31	20.6		20.8
Total Loans and Leases	5	$	3.1	$	3.1	34	$	28.2	$	29.6

Note: Period-end balances reflect all paydowns and charge-offs during the period.

TDR modifications involve extensions of term, deferrals of principal, interest rate concessions, and other modifications. Other modifications typically reflect other nonstandard terms which Northern Trust would not offer in non-troubled situations.

During the three and nine months ended September 30, 2020, the TDR modifications of loans within residential real estate were extensions of term, other modifications, deferred principal, and interest rate concessions. During the three and nine months ended September 30, 2020, the TDR modifications within commercial and institutional were other modifications and extensions of term.

During the three and nine months ended September 30, 2019, the TDR modifications of loans within residential real estate were extensions of term, other modifications, deferred principal and interest rate concessions. During the nine months ended September 30, 2019, the TDR modification within commercial and institutional was an other modification.

There were no residential real estate loan TDR modifications during the twelve months ended June 30, 2020, which subsequently had a payment default during the three and nine months ended September 30, 2020.

There were three residential real estate loan TDR modifications during the twelve months ended June 30, 2019, which subsequently had a payment default during the three and nine months ended September 30, 2019. The total recorded investment for these loans was approximately $1.6 million and the unpaid principal balance for these loans was approximately $1.7 million.

Northern Trust may obtain physical possession of real estate via foreclosure on an in-substance repossession. As of September 30, 2020, Northern Trust held foreclosed real estate properties with a carrying value of $0.9 million as a result of obtaining physical possession. In addition, as of September 30, 2020, Northern Trust had loans with a carrying value of $11.7 million for which formal foreclosure proceedings were in process.

TDR Relief — COVID-19. Due to the economic environment arising from the COVID-19 pandemic, there have been two forms of relief provided for classifying loans as TDRs: the Interagency Guidance (as defined below) and the CARES Act.

Various banking regulators, including the Board of Governors of the Federal Reserve System, the Federal Deposit Insurance Corporation, the National Credit Union Administration, the Office of the Comptroller of the Currency, and the Consumer Financial Protection Bureau, have issued guidance in the April 7, 2020 Interagency Statement on Loan Modifications and

Reporting for Financial Institutions Working with Customers Affected by the Coronavirus (revised) on loan modification treatment (Interagency Guidance) pursuant to which financial institutions can apply ASC 310-40 Receivables – Troubled Debt Restructurings by Creditors. In accordance with the Interagency Guidance, a loan modification is not considered a TDR if the modification is related to COVID-19; the borrower had been current (not more than 29 days past due) when the modification program was implemented; and the modification includes payment deferrals for not more than 6 months.

Under section 4013 of the CARES Act, relief provided to lenders exempting certain loan modifications which would otherwise be classified as TDRs from such classification applies for loans that were current and existing as of December 31, 2019. The TDR relief under the CARES Act applies to COVID-19-related modifications that were made from March 1, 2020 until the earlier of (a) December 31, 2020 or (b) 60 days from the date the COVID-19 national emergency officially ends.

Financial institutions may account for eligible loan modifications under the Interagency Guidance and/or the CARES Act. Northern Trust has elected to apply both the CARES Act and the Interagency Guidance, as applicable, in providing borrowers with loan modification relief in response to the COVID-19 pandemic. All other types of modifications which do not meet the CARES Act or Interagency Guidance requirements continue to be governed by existing regulations and accounting policies.

The following tables provide, by segment and class, the number of total COVID-19-related loan modifications including the loan volume and deferred principal and interest balances as of September 30, 2020, for which Northern Trust applied an exemption from TDR classification that are in active deferral (loans currently in the deferral period) or completed deferral (loans that returned to their regular payment schedule).

TABLE 53: COVID-19 LOAN MODIFICATIONS NOT CONSIDERED TDRS IN ACTIVE DEFERRAL STATUS

	SEPTEMBER 30, 2020
($ In Millions)	NUMBER OF COVID-19 RELATED MODIFICATIONS	LOAN VOLUME		DEFERRED PRINCIPAL AMOUNT		DEFERRED INTEREST AMOUNT
Commercial
Commercial and Institutional	13	$	73.2	$	0.3	$	0.5
Commercial Real Estate	2	7.3		—		—
Total Commercial	15	$	80.5	$	0.3	$	0.5
Personal
Private Client	2	$	5.2	$	—	$	0.1
Residential Real Estate	53	19.3		0.3		0.3
Total Personal	55	$	24.5	$	0.3	$	0.4
Total Loans	70	$	105.0	$	0.6	$	0.9

TABLE 54: COVID-19 LOAN MODIFICATIONS NOT CONSIDERED TDRS THAT HAVE COMPLETED DEFERRAL

	SEPTEMBER 30, 2020
($ In Millions)	NUMBER OF COVID-19 RELATED MODIFICATIONS	LOAN VOLUME		DEFERRED PRINCIPAL AMOUNT		DEFERRED INTEREST AMOUNT
Commercial
Commercial and Institutional	101	$	199.7	$	5.0	$	1.5
Commercial Real Estate	104	472.2		2.9		3.3
Total Commercial	205	$	671.9	$	7.9	$	4.8
Personal
Private Client	34	$	177.6	$	2.3	$	1.1
Residential Real Estate	346	184.8		0.5		2.0
Total Personal	380	$	362.4	$	2.8	$	3.1
Total Loans	585	$	1,034.3	$	10.7	$	7.9

Not included in the table above are 31 loans with $34.3 million in loan balances as of June 30, 2020 that had been granted payment deferrals but have since paid off.

Northern Trust continues to accrue and recognize interest income during the loan deferral period, and hence has not moved these loans to nonaccrual or reported them as past due. Further, these loan balances continue to be assessed on a collective basis for purposes of measuring an allowance for expected credit losses.

Collateral Dependent Financial Assets. A financial asset is collateral-dependent when the borrower is experiencing financial difficulty and repayment is expected to be provided substantially through the sale or operation of the collateral. Most of Northern Trust’s collateral dependent credit exposure relates to its residential real estate portfolio for which the collateral is usually the underlying real estate property. For collateral dependent financial assets, it is Northern Trust’s policy to reserve or charge-off the difference between the amortized cost basis of the loan and the value of the collateral. The collateral dependent financial asset balance as of September 30, 2020 was immaterial to Northern Trust’s financial statements.

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Allowance for Credit Losses

9 Months Ended

Sep. 30, 2020

Receivables [Abstract]

Allowance for Credit Losses

Allowance for Credit Losses

During the first quarter of 2020, the Corporation implemented a change in the classification of certain loans and leases to specific segments to enhance the consistency of its reporting across various regulatory regimes. The allowance for credit losses as of and prior to December 31, 2019 remains unadjusted, as the impact of the reclassification on the allowance was immaterial.

The Corporation adopted Accounting Standards Update (ASU) No. 2016-13, “Financial Instruments—Credit Losses: Measurement of Credit Losses on Financial Instruments” (ASU 2016-13) on January 1, 2020, which significantly changed the way impairment of financial instruments is recognized by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of financial instruments. An opening balance sheet adjustment related to the adoption of ASU 2016-13 resulted in an increase to the allowance for credit losses of $13.7 million, with a corresponding adjustment to decrease retained earnings by $10.1 million, net of tax. For more information on the adoption of ASU 2016-13, please refer to Note 2 — Recent Accounting Pronouncements to the consolidated financial statements provided in Item 1. Consolidated Financial Statements (unaudited).

Allowance and Provision for Credit Losses. The allowance for credit losses — which represents management’s estimate of lifetime expected credit losses related to various portfolios subject to credit risk, off-balance-sheet credit exposures, and specific borrower relationships — is determined by management through a disciplined credit review process. Northern Trust measures expected credit losses of financial assets with similar risk characteristics on a collective basis. A financial asset is measured individually if it does not share similar risk characteristics with other financial assets and the related allowance is determined through an individual evaluation.

Management’s estimates utilized in establishing an appropriate level of allowance for credit losses are not dependent on any single assumption. In determining an appropriate allowance level, management evaluates numerous variables, many of which are interrelated or dependent on other assumptions and estimates, and takes into consideration past events, current conditions and reasonable and supportable forecasts.

The results of the credit reserve estimation methodology are reviewed quarterly by Northern Trust’s Credit Loss Reserve Committee, which receives input from Credit Risk Management, Treasury, Corporate Finance, the Economic Research group, and each of Northern Trust’s business units. The Credit Loss Reserve Committee determines the probability weights applied to each forecast approved by Northern Trust’s Macroeconomic Scenario Design Committee, and also reviews and approves qualitative adjustments to the collective allowance in line with Northern Trust’s qualitative adjustment framework.

The following table provides information regarding changes in the total allowance for credit losses during the three and nine months ended September 30, 2020 and 2019.

TABLE 55: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES

	THREE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		DEBT SECURITIES HELD TO MATURITY		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	$	210.2	$	49.0	$	6.5	$	1.3	$	267.0
Charge-Offs	(0.8)		—		—		—		(0.8)
Recoveries	1.2		—		—		—		1.2
Net Recoveries (Charge-Offs)	0.4		—		—		—		0.4
Provision for Credit Losses	4.8		(4.1)		0.4		(0.6)		0.5
Balance at End of Period	$	215.4	$	44.9	$	6.9	$	0.7	$	267.9

	NINE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		DEBT SECURITIES HELD TO MATURITY		OTHER FINANCIAL ASSETS		TOTAL
Balance at End of Prior Period	$	104.5	$	19.9	$	—	$	—	$	124.4
Cumulative Effect Adjustment	(2.2)		8.9		6.6		0.4		13.7
Balance at Beginning of Period	102.3		28.8		6.6		0.4		138.1
Charge-Offs	(3.0)		—		—		—		(3.0)
Recoveries	5.3		—		—		—		5.3
Net Recoveries (Charge-Offs)	2.3		—		—		—		2.3
Provision for Credit Losses	110.8		16.1		0.3		0.3		127.5
Balance at End of Period	$	215.4	$	44.9	$	6.9	$	0.7	$	267.9

	THREE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		TOTAL
Balance at Beginning of Period	$	110.8	$	23.3	$	134.1
Charge-Offs	(1.1)		—		(1.1)
Recoveries	1.7		—		1.7
Net Recoveries (Charge-Offs)	0.6		—		0.6
Provision for Credit Losses	(5.7)		(1.3)		(7.0)
Balance at End of Period	$	105.7	$	22.0	$	127.7

	NINE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		TOTAL
Balance at Beginning of Period	$	112.6	$	25.6	$	138.2
Charge-Offs	(2.7)		—		(2.7)
Recoveries	5.7		—		5.7
Net Recoveries (Charge-Offs)	3.0		—		3.0
Provision for Credit Losses	(9.9)		(3.6)		(13.5)
Balance at End of Period	$	105.7	$	22.0	$	127.7

The portion of the allowance assigned to loans and leases, debt securities held to maturity, and other financial assets is presented as a contra asset in Allowance for Credit Losses on the consolidated balance sheets. The portion of the allowance assigned to undrawn loan commitments and standby letters of credit is reported in Other Liabilities on the consolidated balance sheets. For credit exposure and the associated allowance related to fee receivables, please refer to Note 14 — Revenue from Contracts with Clients. For information related to the allowance for debt securities available for sale, please refer to Note 4 — Securities. For all other financial assets recognized at amortized cost, which include Cash and Due from Banks, Other Central Bank Deposits, Interest Bearing Deposits with Banks, Federal Funds Sold, and Other Assets, please refer to the Allowance for Other Financial Assets section within this footnote.

The Provision for Credit Losses on the consolidated statements of income represents the change in the Allowance for Credit Losses and is the charge to current period earnings that is determined by management, through a disciplined credit review process, to be the amount needed to maintain the Allowance for Credit Losses at an appropriate level to absorb lifetime expected credit losses related to financial assets in scope. Actual losses may vary from current estimates and the amount of the Provision for Credit Losses may be either greater than or less than actual net charge-offs.

There was a $0.5 million Provision for Credit Losses in the current quarter as calculated under the Current Expected Credit Losses (CECL) methodology, as compared to a $7.0 million credit provision in the prior-year quarter calculated under the previous “incurred loss” model. There were net recoveries of $0.4 million during the three months ended September 30, 2020, as compared to net recoveries of $0.6 million for the three months ended September 30, 2019. The provision in the current quarter was primarily due to an increase in the reserve evaluated on a collective basis, which relates to pooled financial assets sharing similar risk characteristics. The increase in the collective basis reserve was driven by projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with increases in the private client, commercial real estate, and residential real estate portfolios, partially offset by a decrease in the commercial and institutional portfolio. The overall increase in the reserve on a collective basis was partially offset by a decrease in the reserve associated with loans evaluated on an individual basis.

There was a $127.5 million Provision for Credit Losses for the nine months ended September 30, 2020 as calculated under the CECL methodology, as compared to a $13.5 million credit provision in the prior-year period calculated under the previous “incurred loss” model. There were net recoveries of $2.3 million during the nine months ended September 30, 2020, as compared to net recoveries of $3.0 million for the nine months ended September 30, 2019. The provision in the current period was primarily due to an increase in the reserve evaluated on a collective basis driven by downgrades in the portfolio and current and projected economic conditions, both resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with the largest increases in the commercial and institutional and commercial real estate portfolios.

Forecasting and Reversion. Estimating expected lifetime credit losses requires the consideration of the effect of future economic conditions. Northern Trust employs multiple scenarios over a reasonable and supportable period (currently two years) to project future conditions. Management determines the probability weights assigned to each scenario at each quarter-end. Key variables determined to be relevant for projecting credit losses on the portfolios in scope include macroeconomic factors, such as corporate profits, unemployment, and real estate price indices, as well as financial market factors such as equity prices, volatility, and credit spreads. For periods beyond the reasonable and supportable period, Northern Trust reverts to its own historical loss experiences on a straight-line basis over four quarters.

Contractual Term. Northern Trust estimates expected credit losses over the contractual term of the financial assets adjusted for prepayments, unless prepayments are not relevant to specific portfolios or sub-portfolios. Extension and renewal options are typically not considered since it is not Northern Trust’s practice to enter into arrangements where the borrower has the unconditional option to renew, or a conditional extension option whereby the conditions are beyond Northern Trust’s control.

Accrued Interest. Accrued interest balances are reported within Other Assets on the consolidated balance sheets. Northern Trust elected not to measure an allowance for credit losses for accrued interest receivables related to its loan and securities portfolio as its policy is to write-off uncollectible accrued interest receivable balances in a timely manner. Accrued interest is written off by reversing interest income during the quarter the financial asset is moved from an accrual to a nonaccrual status.

The following table provides the amount of accrued interest excluded from the amortized cost basis of the following portfolios.

TABLE 56: ACCRUED INTEREST

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Loans and Leases	$	54.2	$	84.5
Debt Securities
Held to Maturity	$	71.7	$	82.3
Available for Sale	101.0		119.0
Other Financial Assets	$	1.7	$	14.7

The following table provides amounts of accrued interest reversed through interest income by segment for the loan and lease portfolio.

TABLE 57: ACCRUED INTEREST REVERSED THROUGH INCOME

	THREE MONTHS ENDED SEPTEMBER 30,		NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2020
Commercial	$	0.5	$	1.5
Personal	0.6		$	2.0
Total Loans and Leases	$	1.1	$	3.5

Interest income that would have been recorded for nonaccrual loans and leases in accordance with their original terms was $1.8 million for the three months ended September 30, 2019 and $5.7 million for the nine months ended September 30, 2019.

There was no accrued interest reversed through interest income related to any other financial assets for the three and nine months ended September 30, 2020 and 2019.

Allowance for the Loan and Lease Portfolio. The following table provides information regarding changes in the total allowance for credit losses, including undrawn loan commitments and standby letters of credit, by segment during the three and nine months ended September 30, 2020 and 2019.

TABLE 58: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO LOANS AND LEASES

	THREE MONTHS ENDED SEPTEMBER 30, 2020
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	162.8	$	47.4	$	210.2	$	46.1	$	2.9	$	49.0
Charge-Offs	—		(0.8)		(0.8)		—		—		—
Recoveries	0.2		1.0		1.2		—		—		—
Net Recoveries (Charge-Offs)	0.2		0.2		0.4		—		—		—
Provision for Credit Losses	(15.4)		20.2		4.8		(6.0)		1.9		(4.1)
Balance at End of Period	$	147.6	$	67.8	$	215.4	$	40.1	$	4.8	$	44.9

	NINE MONTHS ENDED SEPTEMBER 30, 2020
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at End of Prior Period	$	58.1	$	46.4	$	104.5	$	15.8	$	4.1	$	19.9
Cumulative Effect Adjustment	(5.9)		3.7		(2.2)		11.9		(3.0)		8.9
Balance at Beginning of Period	52.2		50.1		102.3		27.7		1.1		28.8
Charge-Offs	(0.1)		(2.9)		(3.0)		—		—		—
Recoveries	2.2		3.1		5.3		—		—		—
Net Recoveries (Charge-Offs)	2.1		0.2		2.3		—		—		—
Provision for Credit Losses	93.3		17.5		110.8		12.4		3.7		16.1
Balance at End of Period	$	147.6	$	67.8	$	215.4	$	40.1	$	4.8	$	44.9

	THREE MONTHS ENDED SEPTEMBER 30, 2019
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	59.9	$	50.9	$	110.8	$	18.5	$	4.8	$	23.3
Charge-Offs	—		(1.1)		(1.1)		—		—		—
Recoveries	—		1.7		1.7		—		—		—
Net Recoveries (Charge-Offs)	—		0.6		0.6		—		—		—
Provision for Credit Losses	(1.3)		(4.4)		(5.7)		(0.7)		(0.6)		(1.3)
Balance at End of Period	$	58.6	$	47.1	$	105.7	$	17.8	$	4.2	$	22.0

	NINE MONTHS ENDED SEPTEMBER 30, 2019
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	57.6	$	55.0	$	112.6	$	21.1	$	4.5	$	25.6
Charge-Offs	(0.1)		(2.6)		(2.7)		—		—		—
Recoveries	0.7		5.0		5.7		—		—		—
Net Recoveries (Charge-Offs)	0.6		2.4		3.0		—		—		—
Provision for Credit Losses	0.4		(10.3)		(9.9)		(3.3)		(0.3)		(3.6)
Balance at End of Period	$	58.6	$	47.1	$	105.7	$	17.8	$	4.2	$	22.0

The increase to the allowance for loans and leases for the three months ended September 30, 2020 was primarily due to an increase in the reserve evaluated on a collective basis, which relates to pooled financial assets sharing similar risk characteristics. The increase in the collective basis reserve was driven by projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with increases in the private client, commercial real estate, and residential real estate portfolios, partially offset by a decrease in the commercial and institutional portfolio. The overall increase in the reserve on a collective basis was partially offset by a decrease in the reserve associated with loans evaluated on an individual basis. The decrease to the allowance for undrawn loan commitments and standby letters of credit for the three months ended September 30, 2020 was primarily due to a decrease in the reserve evaluated on a collective basis driven

by projected economic conditions resulting from the ongoing COVID-19 pandemic with decreases in the non-U.S commercial and commercial and institutional portfolios, partially offset by increases in the private client portfolio.

The increase to the allowance for both loans and leases and undrawn loan commitments and standby letters of credit for the nine months ended September 30, 2020 was primarily due to an increase in the reserve evaluated on a collective basis driven by downgrades in the portfolio and current and projected economic conditions, both resulting from the ongoing COVID-19 pandemic and related market and economic impacts, with the largest increases in the commercial and institutional and commercial real estate portfolios.

Allowance Related to Credit Exposure Evaluated on a Collective Level. Expected credit losses are measured on a collective basis as long as the financial assets included in the respective pool share similar risk characteristics. If financial assets are deemed to not share similar risk characteristics, an individual assessment is warranted.

The allowance estimation methodology for the collective assessment is primarily based on internally developed loss data specific to the Northern Trust financial asset portfolio from a historical observation period that includes both expansionary and recessionary periods. The estimation methodology and the related qualitative adjustment framework segregate the loan and lease portfolio into homogenous segments based on similar risk characteristics or risk monitoring methods.

Northern Trust utilizes a quantitative probability of default/loss given default approach for the calculation of its credit allowance on a collective basis. For each of the different parameters, specific credit models for the individual loan segments were developed. For each segment, the probability of default and the loss given default are applied to the exposure at default for each projected quarter to determine the quantitative component of the allowance. The quantitative allowance is then reviewed within the qualitative adjustment framework, through which management applies judgment by assessing internal risk factors, potential limitations in the quantitative methodology, and environmental factors that are not fully contemplated in the forecast to compute an adjustment to the quantitative allowance for each segment of the loan portfolio.

Allowance Related to Credit Exposure Evaluated on an Individual Level. The allowance is determined through an individual evaluation of loans, leases, and lending-related commitments considered impaired that is based on expected future cash flows, the value of collateral, and other factors that may impact the borrower’s ability to pay. For impaired loans for which the amount of allowance, if any, is determined based on the value of the underlying real estate collateral, third-party appraisals are typically obtained and utilized by management. These appraisals are generally less than twelve months old and are subject to adjustments to reflect management’s judgment as to the realizable value of the collateral.

The following table provides information regarding the recorded investments in loans and leases and the allowance for credit losses for loans and leases and undrawn loan commitments and standby letters of credit by segment as of September 30, 2020 and December 31, 2019.

TABLE 59: RECORDED INVESTMENTS IN LOANS AND LEASES

	SEPTEMBER 30, 2020						DECEMBER 31, 2019
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Loans and Leases
Evaluated on an Individual Level	$	34.1	$	63.9	$	98.0	$	10.4	$	81.8	$	92.2
Evaluated on a Collective Level	14,547.6		18,120.7		32,668.3		13,990.9		17,326.5		31,317.4
Total Loans and Leases	14,581.7		18,184.6		32,766.3		14,001.3		17,408.3		31,409.6
Allowance for Credit Losses on Credit Exposures
Evaluated on an Individual Level	5.6		0.4		6.0		3.4		1.6		5.0
Evaluated on a Collective Level	142.0		67.4		209.4		54.7		44.8		99.5
Allowance Assigned to Loans and Leases	147.6		67.8		215.4		58.1		46.4		104.5
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Level	2.2		—		2.2		1.9		—		1.9
Evaluated on a Collective Level	37.9		4.8		42.7		13.9		4.1		18.0
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	40.1		4.8		44.9		15.8		4.1		19.9
Total Allowance Assigned to Loans and Leases and Undrawn Loan Commitments and Standby Letters of Credit	$	187.7	$	72.6	$	260.3	$	73.9	$	50.5	$	124.4

Northern Trust analyzes its exposure to credit losses from both on-balance-sheet and off-balance-sheet activity using a consistent methodology for the quantitative framework as well as the qualitative framework. For purposes of estimating the allowance for credit losses for undrawn loan commitments and standby letters of credit, the exposure at default includes an

estimated drawdown of unused credit based on credit utilization factors, resulting in a proportionate amount of expected credit losses.

Allowance for Debt Securities Held to Maturity Securities Portfolio. The following table provides information regarding changes in the total allowance for credit losses for debt securities held to maturity during the three and nine months ended September 30, 2020.

TABLE 60: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO DEBT SECURITIES HELD TO MATURITY

	THREE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPERNATIONAL, AND NON-U.S. AGENCY BONDS		CERTIFICATE OF DEPOSITS		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	0.5	$	0.4	$	0.7	$	—	$	—	$	4.9	$	6.5
Provision for Credit Losses	0.2		—		(0.1)		0.2		0.1		—		0.4
Balance at End of Period	$	0.7	$	0.4	$	0.6	$	0.2	$	0.1	$	4.9	$	6.9

	NINE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPERNATIONAL, AND NON-U.S. AGENCY BONDS		CERTIFICATE OF DEPOSITS		COVERED BONDS		OTHER		TOTAL
Balance at End of Prior Period	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Cumulative Effect Adjustment	0.8		0.3		0.9		—		—		4.6		6.6
Balance at Beginning of Period	0.8		0.3		0.9		—		—		4.6		6.6
Provision for Credit Losses	(0.1)		0.1		(0.3)		0.2		0.1		0.3		0.3
Balance at End of Period	$	0.7	$	0.4	$	0.6	$	0.2	$	0.1	$	4.9	$	6.9

Prior to the adoption of ASU 2016-13, Northern Trust recognized $4.4 million of cumulative Other-Than-Temporary-Impairment (OTTI) losses on the debt securities classified as other as of December 31, 2019. For debt securities with previous OTTI losses recorded, Northern Trust applied ASU 2016-13 on a prospective basis whereby the amortized cost basis of the impaired security remains unchanged immediately before and after adopting ASU 2016-13. The allowance recorded at January 1, 2020 for debt securities held to maturity equals the difference between the calculated expected loss and the amount of OTTI loss previously recorded and represents the cumulative effect adjustment required upon the adoption of ASU 2016-13.

The increase to the allowance attributable to debt securities held to maturity for the three and nine months ended September 30, 2020 was primarily due to an increase in the reserve evaluated on a collective basis driven by current and projected economic conditions resulting from the ongoing COVID-19 pandemic and related market and economic impacts.

The allowance for credit losses for Northern Trust’s debt securities held to maturity portfolio is evaluated as follows:

•Debt securities held to maturity classified as U.S. government, government sponsored agency, and certain securities classified as obligations of states and political subdivisions are considered to be guarantees of the U.S. government or an agency of the U.S. government and therefore an allowance for credit losses is not estimated for such investments as the expected probability of non-payment of the amortized cost basis is zero.

•Debt securities held to maturity classified as other asset-backed represent pools of underlying receivables from which the cash flows are used to pay the bonds that vary in seniority. Utilizing a qualitative estimation approach, the allowance for other asset-backed securities is assessed by evaluating underlying pool performance based on delinquency rates and available credit support.

•Debt securities held to maturity classified as other relates to investments purchased by Northern Trust to fulfill its obligations under the Community Reinvestment Act (CRA). Northern Trust fulfills its obligations under the CRA by making qualified investments for purposes of supporting institutions and programs that benefit low-to-moderate income communities within Northern Trust’s market area. The allowance for CRA investments is assessed using a qualitative estimation approach primarily based on internal historical performance experience and default history of the underlying CRA portfolios to determine a quantitative component of the allowance.

The allowance estimation methodology for all other debt securities held to maturity is developed using a combination of external and internal data. The estimation methodology groups securities with shared characteristics for which the probability of default and the loss given default are applied to the total exposure at default to determine a quantitative component of the allowance.

Allowance for Other Financial Assets. The allowance for Other Financial Assets consists of the allowance for Cash and Due from Banks, Other Central Bank Deposits, Interest Bearing Deposits with Banks, Federal Funds Sold, and Other Assets. The Other Assets category includes other miscellaneous credit exposures reported in Other Assets on the consolidated balance sheets. The allowance estimation methodology for Other Financial Assets primarily utilizes a similar approach as used for the Debt Securities Held to Maturity portfolio. It consists of a combination of externally and internally developed loss data, adjusted for the appropriate contractual term. Northern Trust’s portfolio is composed mostly of institutions within the “1 to 3” internal borrower rating category and expected to exhibit minimal to modest likelihood of loss. The allowance for credit losses related to Other Financial Assets was $0.7 million as of September 30, 2020.

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Pledged Assets

9 Months Ended

Sep. 30, 2020

Transfers and Servicing [Abstract]

Pledged Assets

Pledged Assets

Certain of Northern Trust’s subsidiaries, as required or permitted by law, pledge assets to secure public and trust deposits, repurchase agreements and borrowings, as well as for other purposes, including support for securities settlement, primarily related to client activities, and for derivative contracts.

The following table presents Northern Trust's pledged assets.

TABLE 61: TYPE OF PLEDGED ASSETS

(In Billions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Securities
Obligations of States and Political Subdivisions	$	1.6	$	1.0
Government Sponsored Agency and Other Securities	30.0		33.4
Loans	11.8		7.7
Total Pledged Assets	$	43.4	$	42.1

Collateral required for these purposes totaled $7.6 billion and $8.5 billion at September 30, 2020 and December 31, 2019, respectively.

The following table presents the available for sale debt securities pledged as collateral that are included in pledged assets.

TABLE 62: FAIR VALUE OF AVAILABLE FOR SALE DEBT SECURITIES INCLUDED IN PLEDGED ASSETS

	SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE				DERIVATIVE CONTRACTS
(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019		SEPTEMBER 30, 2020		DECEMBER 31, 2019
Debt Securities
Available for Sale	$	268.6	$	487.1	$	30.0	$	14.4

The secured parties to these transactions have the right to repledge or sell the securities as it relates to $268.6 million and $487.2 million of the pledged collateral as of September 30, 2020 and December 31, 2019, respectively.

Northern Trust accepts financial assets as collateral that it is and is not permitted to repledge or sell. The collateral is generally obtained under certain reverse repurchase agreements and derivative contracts. The following table presents the fair value of securities accepted as collateral. There was no repledged or sold collateral at September 30, 2020 or December 31, 2019.

TABLE 63: ACCEPTED COLLATERAL

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Collateral that may be repledged or sold
Reverse repurchase agreements	$	1,533.4	$	707.8
Derivative contracts	30.6		16.8

Deposits maintained to meet Federal Reserve Bank reserve requirements averaged $0.5 billion for the nine months ended September 30, 2020. As a result of the economic environment arising from the COVID-19 pandemic, the Federal Reserve reduced the reserve requirement to zero percent on March 26, 2020. During 2019, deposits maintained to meet Federal Reserve Bank reserve requirements averaged $1.6 billion and $1.5 billion for the three and nine months ended September 30, 2019, respectively.

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Goodwill and Other Intangibles

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangibles

Goodwill and Other Intangibles

Goodwill. Changes by reporting segment in the carrying amount of goodwill for the nine months ended September 30, 2020, including the effect of foreign exchange rates on non-U.S.-dollar denominated balances, were as follows:

TABLE 64: GOODWILL BY REPORTING SEGMENT

(In Millions)	CORPORATE & INSTITUTIONAL SERVICES		WEALTH MANAGEMENT		TOTAL
Balance at December 31, 2019	$	625.7	$	71.1	$	696.8
Foreign Exchange Rates	1.2		—		1.2
Balance at September 30, 2020	$	626.9	$	71.1	$	698.0

Other Intangible Assets Subject to Amortization. The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of September 30, 2020 and December 31, 2019 were as follows:

TABLE 65: OTHER INTANGIBLE ASSETS

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Gross Carrying Amount	$	214.3	$	207.2
Less: Accumulated Amortization	101.7		86.6
Net Book Value	$	112.6	$	120.6

Other intangible assets consist primarily of the value of acquired client relationships and are included within Other Assets on the consolidated balance sheets. Amortization expense related to other intangible assets totaled $4.3 million and $12.6 million for the three and nine months ended September 30, 2020, and $4.2 million and $12.5 million for the three and nine months ended September 30, 2019. Amortization for the remainder of 2020 and for the years 2021, 2022, 2023, and 2024 is estimated to be $4.3 million, $14.7 million, $10.1 million, $9.8 million, and $9.7 million, respectively.

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Reporting Segments

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Reporting Segments

Reporting Segments

Northern Trust is organized around its two client-focused reporting segments: Corporate & Institutional Services (C&IS) and Wealth Management. Asset management and related services are provided to C&IS and Wealth Management clients primarily by the Asset Management business. The revenue and expenses of Asset Management and certain other support functions are allocated fully to C&IS and Wealth Management.

Reporting segment financial information, presented on an internal management-reporting basis, is determined by accounting systems used to allocate revenue and expense to each segment, and incorporates processes for allocating assets, liabilities, equity and the applicable interest income and expense utilizing a funds transfer pricing (FTP) methodology. Under the methodology, assets and liabilities receive a funding charge or credit that considers interest rate risk, liquidity risk, and other product characteristics on an instrument level.

Revenues, expenses and average assets are allocated to C&IS and Wealth Management, with the exception of non-recurring activities such as certain costs associated with acquisitions, divestitures, litigation, restructuring, and tax adjustments not directly attributable to a specific reporting segment.

Reporting segment results are subject to reclassification when organizational changes are made. The results are also subject to refinements in revenue and expense allocation methodologies, which are typically reflected on a prospective basis.

The following table reflects the earnings contributions and average assets of Northern Trust’s reporting segments for the three- and nine- month periods ended September 30, 2020 and 2019.

TABLE 66: RESULTS OF REPORTING SEGMENTS

($ In Millions)	CORPORATE & INSTITUTIONAL SERVICES						WEALTH MANAGEMENT						TREASURY AND OTHER						TOTAL CONSOLIDATED
THREE MONTHS ENDED SEPTEMBER 30,	2020			2019			2020			2019			2020			2019			2020			2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$	584.9		$	559.9		$	418.9		$	415.6		$	—		$	—		$	1,003.8		$	975.5
Foreign Exchange Trading Income	58.4			55.5			3.2			4.2			—			—			61.6			59.7
Other Noninterest Income	56.7			53.6			39.7			38.1			(5.3)			(6.7)			91.1			85.0
Total Noninterest Income	700.0			669.0			461.8			457.9			(5.3)			(6.7)			1,156.5			1,120.2
Net Interest Income(1)	139.9			229.9			196.6			195.4			—			—			336.5			425.3
Revenue(1)	839.9			898.9			658.4			653.3			(5.3)			(6.7)			1,493.0			1,545.5
Provision for Credit Losses	(19.2)			4.8			19.7			(11.8)			—			—			0.5			(7.0)
Noninterest Expense	707.3			649.2			386.3			385.9			1.1			1.2			1,094.7			1,036.3
Income before Income Taxes(1)	151.8			244.9			252.4			279.2			(6.4)			(7.9)			397.8			516.2
Provision for Income Taxes(1)	38.7			59.9			66.2			73.6			(1.6)			(1.9)			103.3			131.6
Net Income	$	113.1		$	185.0		$	186.2		$	205.6		$	(4.8)		$	(6.0)		$	294.5		$	384.6
Percentage of Consolidated Net Income	39		%	48		%	63		%	54		%	(2)		%	(2)		%	100		%	100		%
Average Assets	$	108,823.0		$	85,982.2		$	32,102.4		$	30,369.9		$	—		$	—		$	140,925.4		$	116,352.1

⁽¹⁾    Non-GAAP financial measures stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $7.9 million for 2020 and $7.6 million for 2019.

($ In Millions)	CORPORATE & INSTITUTIONAL SERVICES						WEALTH MANAGEMENT						TREASURY AND OTHER						TOTAL CONSOLIDATED
NINE MONTHS ENDED SEPTEMBER 30,	2020			2019			2020			2019			2020			2019			2020			2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,725.5		$	1,644.5		$	1,243.4		$	1,215.4		$	—		$	—		$	2,968.9		$	2,859.9
Foreign Exchange Trading Income	211.8			172.5			10.0			13.9			—			—			221.8			186.4
Other Noninterest Income	167.5			141.8			122.9			95.1			(11.0)			(14.9)			279.4			222.0
Total Noninterest Income	2,104.8			1,958.8			1,376.3			1,324.4			(11.0)			(14.9)			3,470.1			3,268.3
Net Interest Income(1)	516.6			694.3			615.9			585.9			—			—			1,132.5			1,280.2
Revenue(1)	2,621.4			2,653.1			1,992.2			1,910.3			(11.0)			(14.9)			4,602.6			4,548.5
Provision for Credit Losses	35.3			1.3			92.2			(14.8)			—			—			127.5			(13.5)
Noninterest Expense	2,022.2			1,930.5			1,152.7			1,137.9			22.3			2.8			3,197.2			3,071.2
Income before Income Taxes(1)	563.9			721.3			747.3			787.2			(33.3)			(17.7)			1,277.9			1,490.8
Provision for Income Taxes(1)	129.9			171.8			187.9			202.3			(8.3)			(4.4)			309.5			369.7
Net Income	$	434.0		$	549.5		$	559.4		$	584.9		$	(25.0)		$	(13.3)		$	968.4		$	1,121.1
Percentage of Consolidated Net Income	45		%	49		%	58		%	52		%	(3)		%	(1)		%	100		%	100		%
Average Assets	$	102,902.3		$	87,664.1		$	31,742.9		$	29,700.6		$	—		$	—		$	134,645.2		$	117,364.7

⁽¹⁾    Non-GAAP financial measures stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $23.7 million for 2020 and $23.1 million for 2019.

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Stockholders' Equity

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Stockholders' Equity

Stockholders’ Equity

Preferred Stock. The Corporation is authorized to issue 10 million shares of preferred stock without par value. The Board of Directors is authorized to fix the particular designations, preferences and relative, participating, optional and other special rights and qualifications, limitations or restrictions for each series of preferred stock issued.

As of September 30, 2020, 5,000 shares of Series D Non-Cumulative Perpetual Preferred Stock (the “Series D Preferred Stock”) and 16,000 shares of Series E Non-Cumulative Perpetual Preferred Stock (“Series E Preferred Stock”) were outstanding.

Series D Preferred Stock. As of September 30, 2020, the Corporation had issued and outstanding 500,000 depositary shares, each representing a 1/100th ownership interest in a share of Series D Preferred Stock, issued in August 2016. Equity related to Series D Preferred Stock as of September 30, 2020 and December 31, 2019 was $493.5 million. Shares of the Series D Preferred Stock have no par value and a liquidation preference of $100,000 (equivalent to $1,000 per depositary share).

Dividends on the Series D Preferred Stock, which are not mandatory, accrue and are payable on the liquidation preference amount, on a non-cumulative basis, at a rate per annum equal to (i) 4.60% from the original issue date of the Series D Preferred Stock to but excluding October 1, 2026; and (ii) a floating rate equal to Three-Month LIBOR plus 3.202% from and including October 1, 2026. Fixed rate dividends are payable in arrears on the first day of April and October of each year, through and including October 1, 2026, and floating rate dividends will be payable in arrears on the first day of January, April, July and October of each year, commencing on January 1, 2027. On July 21, 2020, the Corporation declared a cash dividend of $2,300 per share of Series D Preferred Stock payable on October 1, 2020, to stockholders of record as of September 15, 2020.

Series E Preferred Stock. As of September 30, 2020, the Corporation had issued and outstanding 16 million depositary shares, each representing 1/1,000th ownership interest in a share of Series E Preferred Stock, issued in November 2019. Equity related to Series E Preferred Stock as of September 30, 2020 and December 31, 2019 was $391.4 million. Shares of the Series E Preferred Stock have no par value and a liquidation preference of $25,000 (equivalent to $25 per depositary share).

Dividends on the Series E Preferred Stock, which are not mandatory, will accrue and be payable on the liquidation preference amount, on a non-cumulative basis, quarterly in arrears on the first day of January, April, July and October of each year, commencing on April 1, 2020, at a rate per annum equal to 4.70%. On July 21, 2020, the Corporation declared a cash dividend of $293.75 per share of Series E Preferred Stock payable on October 1, 2020, to stockholders of record as of September 15, 2020.

Common Stock. As the Corporation suspended its open-market share repurchase program on March 16, 2020, the only shares repurchased during the three months ended September 30, 2020 were 18,534 shares of common stock withheld upon the vesting of share-based compensation at a total cost of $1.5 million ($81.02 average price per share) to satisfy tax withholding obligations. During the nine months ended September 30, 2020, the Corporation repurchased 3,262,621 shares of common stock, including 518,745 shares withheld related to share-based compensation, at a total cost of $298.5 million ($91.49 average price per share). The Corporation’s current stock repurchase authorization to repurchase up to 25.0 million shares was approved by the Board of Directors in July 2018. Shares are repurchased by the Corporation to, among other things, manage the Corporation’s capital levels. Repurchased shares are used for general purposes, including the issuance of shares under stock option and other incentive plans. The repurchase authorization approved by the Board of Directors has no expiration date.

During the second quarter of 2020, the Federal Reserve announced certain measures to ensure that large financial institutions, including Northern Trust, remain resilient despite the economic uncertainty resulting from the ongoing COVID-19 pandemic. Specifically, for the third quarter of 2020, no share repurchases were permitted by these institutions and dividend payments were limited to the amount paid in the second quarter and could not exceed the payor’s average net income for the four preceding quarters. On September 30, 2020, the Federal Reserve announced that these measures have been extended to apply to the fourth quarter of 2020 as well.

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Accumulated Other Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

The following tables summarize the components of accumulated other comprehensive income (loss) (AOCI) at September 30, 2020 and 2019, and changes during the three and nine months then ended.

TABLE 67: SUMMARY OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

	THREE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at June 30, 2020	$	631.8	$	0.3	$	145.5	$	(407.2)	$	370.4
Net Change	33.5		1.3		1.8		17.5		54.1
Balance at September 30, 2020	$	665.3	$	1.6	$	147.3	$	(389.7)	$	424.5

⁽¹⁾ Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2020.

	NINE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at December 31, 2019	$	114.0	$	(3.7)	$	117.8	$	(422.8)	$	(194.7)
Net Change	551.3		5.3		29.5		33.1		619.2
Balance at September 30, 2020	$	665.3	$	1.6	$	147.3	$	(389.7)	$	424.5

⁽¹⁾ Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2020.

	THREE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at June 30, 2019	$	133.1	$	4.5	$	96.8	$	(394.2)	$	(159.8)
Net Change	57.0		(2.4)		9.9		4.3		68.8
Balance at September 30, 2019	$	190.1	$	2.1	$	106.7	$	(389.9)	$	(91.0)

⁽¹⁾    Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2019.

	NINE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at December 31, 2018	$	(114.9)	$	4.0	$	67.9	$	(410.7)	$	(453.7)
Net Change	305.0		(1.9)		38.8		20.8		362.7
Balance at September 30, 2019	$	190.1	$	2.1	$	106.7	$	(389.9)	$	(91.0)

⁽¹⁾    Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2019.

TABLE 68: DETAILS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

	THREE MONTHS ENDED SEPTEMBER 30,
	2020						2019
(In Millions)	BEFORE TAX		TAX EFFECT		AFTER TAX		BEFORE TAX		TAX EFFECT		AFTER TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale
Unrealized Gains (Losses) on Debt Securities Available for Sale	$	45.3	$	(11.8)	$	33.5	$	76.1	$	(19.4)	$	56.7
Reclassification Adjustment for (Gains) Losses Included in Net Income(1)	—		—		—		0.3		—		0.3
Net Change	$	45.3	$	(11.8)	$	33.5	$	76.4	$	(19.4)	$	57.0
Unrealized Gains (Losses) on Cash Flow Hedges
Foreign Exchange Contracts	$	6.6	$	(1.6)	$	5.0	$	0.7	$	(0.2)	$	0.5
Interest Rate Contracts	(0.2)		—		(0.2)		0.1		—		0.1
Reclassification Adjustment for (Gains) Losses Included in Net Income(2)	(4.7)		1.2		(3.5)		(4.0)		1.0		(3.0)
Net Change	$	1.7	$	(0.4)	$	1.3	$	(3.2)	$	0.8	$	(2.4)
Foreign Currency Adjustments
Foreign Currency Translation Adjustments	$	92.1	$	(3.1)	$	89.0	$	(71.9)	$	2.0	$	(69.9)
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)	1.2		(0.3)		0.9		(1.3)		0.3		(1.0)
Net Investment Hedge Gains (Losses)	(117.4)		29.3		(88.1)		107.6		(26.8)		80.8
Net Change	$	(24.1)	$	25.9	$	1.8	$	34.4	$	(24.5)	$	9.9
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gains	$	12.6	$	(3.1)	$	9.5	$	—	$	—	$	—
Reclassification Adjustment for (Gains) Losses Included in Net Income(3)
Amortization of Net Actuarial Loss	10.7		(2.6)		8.1		5.7		(1.3)		4.4
Amortization of Prior Service Cost	(0.1)		—		(0.1)		(0.1)		—		(0.1)
Net Change	$	23.2	$	(5.7)	$	17.5	$	5.6	$	(1.3)	$	4.3
Total Net Change	$	46.1	$	8.0	$	54.1	$	113.2	$	(44.4)	$	68.8

See table footnotes under the YTD table.

	NINE MONTHS ENDED SEPTEMBER 30,
	2020						2019
(In Millions)	BEFORE TAX		TAX EFFECT		AFTER TAX		BEFORE TAX		TAX EFFECT		AFTER TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale
Unrealized Gains (Losses) on Debt Securities Available for Sale	$	736.8	$	(185.4)	$	551.4	$	409.0	$	(104.6)	$	304.4
Reclassification Adjustment for (Gains) Losses Included in Net Income(1)	(0.1)		—		(0.1)		0.6		—		0.6
Net Change	$	736.7	$	(185.4)	$	551.3	$	409.6	$	(104.6)	$	305.0
Unrealized Gains (Losses) on Cash Flow Hedges
Foreign Exchange Contracts	$	18.1	$	(4.5)	$	13.6	$	17.4	$	(4.3)	$	13.1
Interest Rate Contracts	0.2		(0.1)		0.1		1.4		(0.3)		1.1
Reclassification Adjustment for (Gains) Losses Included in Net Income(2)	(11.2)		2.8		(8.4)		(21.4)		5.3		(16.1)
Net Change	$	7.1	$	(1.8)	$	5.3	$	(2.6)	$	0.7	$	(1.9)
Foreign Currency Adjustments
Foreign Currency Translation Adjustments	$	53.1	$	(1.0)	$	52.1	$	(69.4)	$	3.3	$	(66.1)
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)	0.7		(0.2)		0.5		(1.3)		0.3		(1.0)
Net Investment Hedge Gains (Losses)	(29.8)		6.7		(23.1)		144.1		(38.2)		105.9
Net Change	$	24.0	$	5.5	$	29.5	$	73.4	$	(34.6)	$	38.8
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gains (Losses)	$	11.8	$	(3.0)	$	8.8	$	11.4	$	(3.1)	$	8.3
Reclassification Adjustment for (Gains) Losses Included in Net Income(3)
Amortization of Net Actuarial Loss	$	32.3	$	(7.8)	$	24.5	$	16.8	$	(4.1)	$	12.7
Amortization of Prior Service Cost	(0.2)		—		(0.2)		(0.2)		—		(0.2)
Net Change	$	43.9	$	(10.8)	$	33.1	$	28.0	$	(7.2)	$	20.8
Total Net Change	$	811.7	$	(192.5)	$	619.2	$	508.4	$	(145.7)	$	362.7

⁽¹⁾ The before-tax reclassification adjustment out of AOCI related to the realized gains (losses) on debt securities available for sale is recorded as Investment Security Gains (Losses), net within the consolidated statements of income.

⁽²⁾ See Note 20 — Derivative Financial Instruments for the location of the reclassification adjustment related to cash flow hedges.

⁽³⁾ The before-tax reclassification adjustment out of AOCI related to pension and other postretirement benefit adjustments is recorded in Employee Benefits expense within the consolidated statements of income.

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Net Income Per Common Share Computations

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Net Income Per Common Share Computations

Net Income Per Common Share Computations

The computations of net income per common share are presented in the following table.

TABLE 69: NET INCOME PER COMMON SHARE

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
($ In Millions Except Per Common Share Information)	2020		2019		2020		2019
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding	208,106,190		213,176,809		208,351,088		215,832,347
Net Income	$	294.5	$	384.6	$	968.4	$	1,121.1
Less: Dividends on Preferred Stock	16.2		17.4		51.5		40.6
Net Income Applicable to Common Stock	278.3		367.2		916.9		1,080.5
Less: Earnings Allocated to Participating Securities	3.3		4.5		10.6		12.6
Earnings Allocated to Common Shares Outstanding	275.0		362.7		906.3		1,067.9
Basic Net Income Per Common Share	$	1.32	$	1.70	$	4.35	$	4.95
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding	208,106,190		213,176,809		208,351,088		215,832,347
Plus: Dilutive Effect of Share-based Compensation	582,304		1,029,767		672,243		1,031,216
Average Common and Potential Common Shares	208,688,494		214,206,576		209,023,331		216,863,563
Earnings Allocated to Common and Potential Common Shares	$	275.0	$	362.7	$	906.3	$	1,067.9
Diluted Net Income Per Common Share	1.32		1.69		4.34		4.92

Note:    For the three and nine months ended September 30, 2020 and 2019, there were no common stock equivalents excluded in the computation of diluted net income per share.

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Revenue from Contracts with Clients

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Clients

Revenue from Contracts with Clients

Trust, Investment, and Other Servicing Fees. Custody and fund administration income is comprised of revenues received from our core asset servicing business for providing custody, fund administration, and middle-office-related services, primarily to C&IS clients. Investment management and advisory income contains revenue received from providing asset management and related services to Wealth Management and C&IS clients and to Northern Trust sponsored funds. Securities lending income represents revenues generated from securities lending arrangements that Northern Trust enters into as agent, mainly with C&IS clients. Other income largely consists of revenues received from providing employee benefit, investment risk and analytic and other services to C&IS and Wealth Management clients.

Other Noninterest Income. Treasury management income represents revenues received from providing cash and liquidity management services to C&IS and Wealth Management clients. The portion of securities commissions and trading income that relates to revenue from contracts with clients is primarily comprised of commissions earned from providing securities brokerage services to Wealth Management and C&IS clients. The portion of other operating income that relates to revenue from contracts with clients is mainly comprised of service fees for banking-related services provided to Wealth Management and C&IS clients.

Performance Obligations. Clients are typically charged monthly or quarterly in arrears based on the fee arrangement agreed to with each client; payment terms will vary depending on the client and services offered.

Substantially all revenues generated from contracts with clients for asset servicing, asset management, securities lending, treasury management and banking-related services are recognized on an accrual basis, over the period in which services are provided. The nature of Northern Trust’s performance obligations is to provide a series of distinct services in which the customer simultaneously receives and consumes the benefits of the promised services as they are performed. Fee arrangements are mainly comprised of variable amounts based on market value of client assets managed and serviced, transaction volumes, number of accounts, and securities lending volume and spreads. Revenue is recognized using the output method in an amount that reflects the consideration to which Northern Trust expects to be entitled in exchange for providing each month or quarter of service. For contracts with multiple performance obligations, revenue is allocated to each performance obligation based on the price agreed to with the client, representing its relative standalone selling price.

Security brokerage revenue is primarily represented by securities commissions received in exchange of providing trade execution related services. Control is transferred at a point in time, on the trade date of the transaction, and fees are typically variable based on transaction volumes and security types.

Northern Trust’s contracts with its clients are typically open-ended arrangements and are therefore considered to have an original duration of less than one year. Northern Trust has elected the practical expedient to not disclose the value of remaining performance obligations for contracts with an original expected duration of one year or less.

The following table presents revenues disaggregated by major revenue source.

TABLE 70: REVENUE DISAGGREGATION

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Noninterest Income
Trust, Investment and Other Servicing Fees
Custody and Fund Administration	$	416.4	$	414.8	$	1,231.7	$	1,219.7
Investment Management and Advisory	519.3		491.4		1,515.2		1,428.7
Securities Lending	19.8		20.1		70.7		64.9
Other	48.3		49.2		151.3		146.6
Total Trust, Investment and Other Servicing Fees	$	1,003.8	$	975.5	$	2,968.9	$	2,859.9
Other Noninterest Income
Foreign Exchange Trading Income	$	61.6	$	59.7	$	221.8	$	186.4
Treasury Management Fees	11.6		11.2		34.0		34.1
Security Commissions and Trading Income	26.0		29.1		100.9		75.8
Other Operating Income	53.5		45.1		144.4		113.0
Investment Security Gains (Losses), net	—		(0.4)		0.1		(0.9)
Total Other Noninterest Income	$	152.7	$	144.7	$	501.2	$	408.4
Total Noninterest Income	$	1,156.5	$	1,120.2	$	3,470.1	$	3,268.3

On the consolidated statements of income, Trust, Investment and Other Servicing Fees and Treasury Management Fees represent revenue from contracts with clients. For the three months ended September 30, 2020, revenue from contracts with clients also includes $21.8 million of the $26.0 million total Security Commissions and Trading Income and $10.8 million of the $53.5 million total Other Operating Income. For the nine months ended September 30, 2020, revenue from contracts with clients also included $76.9 million of the $100.9 million total Security Commissions and Trading Income and $31.6 million of the $144.4 million total Other Operating Income.

For the three months ended September 30, 2019, revenue from contracts with clients also includes $23.5 million of the $29.1 million total Security Commissions and Trading Income and $10.5 million of the $45.1 million total Other Operating Income. For the nine months ended September 30, 2019, revenue from contracts with clients also included $64.3 million of the $75.8 million total Security Commissions and Trading Income and $30.9 million of the $113.0 million total Other Operating Income.

Receivables Balances. The table below represents receivables balances from contracts with clients, which are included in Other Assets on the consolidated balance sheets, at September 30, 2020 and December 31, 2019.

TABLE 71: CLIENT RECEIVABLES

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Trust Fees Receivable, net(1)	$	805.7	$	801.9
Other	113.2		101.1
Total Client Receivables	$	918.9	$	903.0

⁽¹⁾ Trust Fees Receivable is net of a $7.3 million and $5.6 million fee receivable allowance as of September 30, 2020 and December 31, 2019, respectively.

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Net Interest Income

9 Months Ended

Sep. 30, 2020

Banking and Thrift, Interest [Abstract]

Net Interest Income

Net Interest Income

The components of net interest income were as follows:

TABLE 72: NET INTEREST INCOME

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Interest Income
Loans and Leases	$	167.1	$	291.0	$	606.4	$	889.8
Securities — Taxable	182.6		265.9		632.1		812.4
— Non-Taxable	0.3		0.9		1.1		3.1
Interest-Bearing Due from and Deposits with Banks(1)	2.7		18.6		20.0		55.7
Federal Reserve and Other Central Bank Deposits and Other	2.7		44.4		31.3		162.8
Total Interest Income	$	355.4	$	620.8	$	1,290.9	$	1,923.8
Interest Expense
Deposits	$	(3.5)	$	122.0	$	56.7	$	403.5
Federal Funds Purchased	0.1		2.4		2.1		22.8
Securities Sold Under Agreements to Repurchase	—		1.6		1.0		5.4
Other Borrowings	5.0		46.0		40.6		145.2
Senior Notes	19.1		19.6		57.0		54.0
Long-Term Debt	5.7		9.4		21.1		29.4
Floating Rate Capital Debt	0.4		2.1		3.6		6.4
Total Interest Expense	$	26.8	$	203.1	$	182.1	$	666.7
Net Interest Income	$	328.6	$	417.7	$	1,108.8	$	1,257.1

⁽¹⁾    Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

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Pension and Postretirement Health Care

9 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Pension and Postretirement Health Care

Pension and Postretirement Health Care

The following table sets forth the net periodic pension and postretirement benefit expense for Northern Trust’s U.S. Qualified Plan, Non-U.S. Pension Plans, U.S. Non-Qualified Plan, and postretirement health care plan for the three and nine months ended September 30, 2020 and 2019.

TABLE 73: NET PERIODIC PENSION EXPENSE (BENEFIT)

U.S. QUALIFIED PLAN	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Service Cost	$	11.9	$	10.4	$	35.5	$	31.2
Interest Cost	10.8		11.8		32.4		35.4
Expected Return on Plan Assets	(19.2)		(21.7)		(57.6)		(65.1)
Amortization
Net Actuarial Loss	8.8		4.3		26.4		12.9
Prior Service Cost	(0.1)		(0.1)		(0.3)		(0.3)
Net Periodic Pension Expense	$	12.2	$	4.7	$	36.4	$	14.1

NON-U.S. PENSION PLANS	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Service Cost	$	0.6	$	0.5	$	1.6	$	1.5
Interest Cost	0.7		0.9		2.1		2.9
Expected Return on Plan Assets	(0.8)		(1.0)		(2.3)		(2.9)
Settlement Expense	0.1		—		0.3		—
Amortization
Net Actuarial Loss	0.2		0.2		0.8		0.5
Prior Service Cost	0.1		—		0.1		—
Net Periodic Pension Expense	$	0.9	$	0.6	$	2.6	$	2.0

U.S. NON-QUALIFIED PLAN	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Service Cost	$	1.2	$	1.1	$	3.4	$	3.1
Interest Cost	1.2		1.5		3.6		4.4
Amortization
Net Actuarial Loss	1.7		1.4		5.3		4.2
Prior Service Cost	—		—		0.1		0.1
Net Periodic Pension Expense	$	4.1	$	4.0	$	12.4	$	11.8

POSTRETIREMENT HEALTH CARE PLAN	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Interest Cost	$	0.2	$	0.3	$	0.6	$	0.9
Amortization
Net Actuarial (Gain)	(0.1)		(0.2)		(0.5)		(0.8)
Prior Service Cost	(0.1)		—		(0.1)		—
Net Periodic Postretirement Expense	$	—	$	0.1	$	—	$	0.1

Northern Trust expects to change the plan design of its post-retirement health care plan as of January 1, 2021, which results in the recognition of negative prior-service cost at the time these changes were communicated to participants in August 2020. Concurrently, a further shift in population from active to inactive participants required an adjustment to the amortization period from the average remaining service period of active participants to the average life expectancy of the inactive participants. The change in plan design and amortization period results in a decrease of the benefit obligation and 2020 benefit expense by $12.6 million and $0.3 million, respectively.

The components of net periodic pension expense are recorded in Employee Benefits expense within the consolidated statements of income.

There were no contributions to the U.S. Qualified Plan during the nine months ended September 30, 2020 and 2019, respectively.

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Share-Based Compensation Plans

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Share-Based Compensation Plans

Share-Based Compensation Plans

The Northern Trust Corporation 2017 Long-Term Incentive Plan provides for the grant of non-qualified and incentive stock options; tandem and free-standing stock appreciation rights; stock awards in the form of restricted stock, restricted stock units and other stock awards; and performance awards.

Beginning with the grants made on February 21, 2017 under the Corporation’s prior equity incentive plan, restricted stock unit and performance stock unit grants continue to vest in accordance with the original terms of the award if the applicable employee retires after satisfying applicable age and service requirements. For all applicable periods, stock option grants continue to vest in accordance with the original terms of the award if the employee meets applicable age and service requirements upon separation from service.

Total compensation expense for share-based payment arrangements and the associated tax impacts were as follows for the three and nine months ended September 30, 2020 and 2019.

TABLE 74: TOTAL COMPENSATION EXPENSE FOR SHARE-BASED PAYMENT ARRANGEMENTS

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Restricted Stock Unit Awards	$	12.2	$	14.0	$	66.3	$	68.5
Stock Options	0.1		0.4		0.4		1.1
Performance Stock Units	1.6		2.9		16.1		21.7
Total Share-Based Compensation Expense	13.9		17.3		82.8		91.3
Tax Benefits Recognized	$	3.5	$	4.3	$	20.6	$	22.7

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Variable Interest Entities

9 Months Ended

Sep. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Variable Interest Entities

Variable Interest Entities

Variable Interest Entities (VIEs) are defined within GAAP as entities which either have a total equity investment that is insufficient to permit the entity to finance its activities without additional subordinated financial support or whose equity investors lack the characteristics of a controlling financial interest. Investors that finance a VIE through debt or equity interests, or other counterparties that provide other forms of support, such as guarantees, subordinated fee arrangements, or certain types of derivative contracts, are variable interest holders in the entity and the variable interest holder, if any, that has both the power to direct the activities that most significantly impact the entity and a variable interest that could potentially be significant to the entity is deemed to be the VIE’s primary beneficiary and is required to consolidate the VIE.

Leveraged Leases. In leveraged leasing transactions, Northern Trust acts as lessor of the underlying asset subject to the lease and typically funds 20 - 30% of the asset’s cost via an equity ownership in a trust with the remaining 70 - 80% provided by third-party non-recourse debt holders. In such transactions, the trusts, which are VIEs, are created to provide the lessee use of the property with substantially all of the rights and obligations of ownership. The lessee’s maintenance and operation of the leased property has a direct effect on the fair value of the underlying property, and the lessee also has the ability to increase the benefits it can receive and limit the losses it can suffer by the manner in which it uses the property. As a result, Northern Trust has determined that it is not the primary beneficiary of the leveraged lease trust VIEs given it lacks the power to direct the activities that most significantly impact the economic performance of the leveraged lease trust VIEs.

Northern Trust’s maximum exposure to loss as a result of its involvement with leveraged lease trust VIEs is limited to the carrying amounts of its leveraged lease investments. The carrying amounts of these investments, which are included in Loans and Leases on the consolidated balance sheets, were $30.1 million and $42.6 million as of September 30, 2020 and December 31, 2019, respectively. Northern Trust’s funding requirements relative to the leveraged lease trust VIEs are limited to its invested capital. Northern Trust has no other liquidity arrangements or obligations to purchase assets of the leveraged lease trust VIEs that would expose Northern Trust to a loss.

Tax Credit Structures. Northern Trust invests in qualified affordable housing projects and community development entities (collectively, community development projects) that are designed to generate a return primarily through the realization of tax credits. The community development projects are formed as limited partnerships and limited liability companies in which Northern Trust invests as a limited partner/investor member through equity contributions. The economic performance of the community development projects, some of which are VIEs, is subject to the performance of their underlying investment and their ability to operate in compliance with the rules and regulations necessary for the qualification of tax credits generated by equity investments. Northern Trust has determined that it is not the primary beneficiary of any community development project VIEs as it lacks the power to direct the activities that most significantly impact the economic performance of the underlying investments or to affect their ability to operate in compliance with the rules and regulations necessary for the qualification of

tax credits generated by equity investments. This power is held by the general partners and managing members who exercise full and exclusive control of the operations of the community development project VIEs.

Northern Trust’s maximum exposure to loss as a result of its involvement with community development projects is limited to the carrying amounts of its investments, including any undrawn commitments. As of September 30, 2020 and December 31, 2019, the carrying amounts of these investments in community development projects that generate tax credits, included in Other Assets on the consolidated balance sheets, totaled $761.3 million and $749.3 million, respectively, of which $715.5 million and $700.3 million are VIEs as of September 30, 2020 and December 31, 2019, respectively. As of September 30, 2020 and December 31, 2019, liabilities related to unfunded commitments on investments in tax credit community development projects, included in Other Liabilities on the consolidated balance sheets, totaled $300.0 million and $376.2 million, respectively, of which $283.5 million and $354.3 million related to undrawn commitments on VIEs as of September 30, 2020 and December 31, 2019, respectively. Northern Trust’s funding requirements are limited to its invested capital and undrawn commitments for future equity contributions. Northern Trust has no exposure to loss from liquidity arrangements and no obligation to purchase assets of the community development projects.

Tax credits and other tax benefits attributable to community development projects totaled $20.7 million and $16.4 million for the three months ended September 30, 2020 and 2019, respectively, and $59.4 million and $49.2 million for the nine months ended September 30, 2020 and 2019, respectively.

Investment Funds. Northern Trust acts as asset manager for various funds in which clients of Northern Trust are investors. As an asset manager of funds, Northern Trust earns a competitively priced fee that is based on assets managed and varies with each fund’s investment objective. Based on its analysis, Northern Trust has determined that it is not the primary beneficiary of these VIEs under GAAP.

Some of the funds for which Northern Trust acts as asset manager comply or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds and therefore the funds are exempt from the consolidation requirements in ASC 810-10. Northern Trust voluntarily waived $5.4 million and $5.7 million of money market mutual fund fees for the three and nine months ended September 30, 2020, respectively. Northern Trust did not waive any money market mutual fund fees for the three and nine months ended September 30, 2019. Northern Trust does not have any contractual obligations to provide financial support to the funds. Any potential future support of the funds will be at the discretion of Northern Trust after an evaluation of the specific facts and circumstances.

Periodically, Northern Trust makes seed capital investments to certain funds. As of September 30, 2020, Northern Trust had $1.7 million of investments valued using net asset value per share and included in Other Assets and had $73.3 million in unfunded commitments related to seed capital investments. As of December 31, 2019, Northern Trust had $112.0 million of investments valued using net asset value per share and included in Other Assets and had no unfunded commitments related to seed capital investments.

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Commitments and Contingent Liabilities

9 Months Ended

Sep. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingent Liabilities

Commitments and Contingent Liabilities

Commitments, Letters of Credit and Indemnifications. Northern Trust, in the normal course of business, enters into various types of commitments and issues letters of credit to meet the liquidity and credit enhancement needs of its clients.

Legally binding commitments to extend credit generally have fixed expiration dates or other termination clauses. Since a significant portion of the commitments are expected to expire without being drawn upon, the total commitment amount does not necessarily represent future loans or liquidity requirements. Legally binding commitments to extend credit totaled $26.4 billion and $24.4 billion as of September 30, 2020 and December 31, 2019, respectively.

Standby letters of credit obligate Northern Trust to meet certain financial obligations of its clients, if, under the contractual terms of the agreement, the clients are unable to do so. These instruments are primarily issued to support public and private financial commitments, including commercial paper, bond financing, initial margin requirements on futures exchanges and similar transactions. Northern Trust is obligated to meet the entire financial obligation of these agreements and in certain cases is able to recover the amounts paid through recourse against collateral received or other participants. Standby letters of credit outstanding and financial guarantees were $2.1 billion and $2.4 billion as of September 30, 2020 and December 31, 2019, respectively. Financial guarantees are issued by Northern Trust to guarantee the performance of a client to a third party under certain arrangements.

As part of its securities custody activities and at the direction of its clients, Northern Trust lends securities owned by clients to borrowers who are reviewed and approved by the Northern Trust Capital Markets Credit Committee. In connection with these activities, Northern Trust has issued indemnifications to certain clients against certain losses that are a direct result of a borrower’s failure to return securities when due, should the value of such securities exceed the value of the collateral required to

be posted. Borrowers are required to collateralize fully securities received with cash or marketable securities. As securities are loaned, collateral is maintained at a minimum of 100% of the fair value of the securities plus accrued interest. The collateral is revalued on a daily basis. The amount of securities loaned as of September 30, 2020 and December 31, 2019 subject to indemnification was $148.3 billion and $138.1 billion, respectively. Because of the credit quality of the borrowers and the requirement to fully collateralize securities borrowed, management believes that the exposure to credit loss from this activity is not significant and no liability was recorded as of September 30, 2020 or December 31, 2019, related to these indemnifications.

Legal Proceedings. In the normal course of business, the Corporation and its subsidiaries are routinely defendants in or parties to pending and threatened legal actions, and are subject to regulatory examinations, information-gathering requests, investigations, and proceedings, both formal and informal. In certain legal actions, claims for substantial monetary damages are asserted. In regulatory matters, claims for disgorgement, restitution, penalties and/or other remedial actions or sanctions may be sought.

Based on current knowledge, after consultation with legal counsel and after taking into account current accruals, management does not believe that losses, fines or penalties, if any, arising from pending litigation or threatened legal actions or regulatory matters either individually or in the aggregate, after giving effect to applicable reserves and insurance coverage will have a material adverse effect on the consolidated financial position or liquidity of the Corporation, although such matters could have a material adverse effect on the Corporation’s operating results for a particular period.

Under GAAP, (i) an event is “probable” if the “future event or events are likely to occur”; (ii) an event is “reasonably possible” if “the chance of the future event or events occurring is more than remote but less than likely”; and (iii) an event is “remote” if “the chance of the future event or events occurring is slight.”

The outcome of litigation and regulatory matters is inherently difficult to predict and/or the range of loss often cannot be reasonably estimated, particularly for matters that (i) will be decided by a jury, (ii) are in early stages, (iii) involve uncertainty as to the likelihood of a class being certified or the ultimate size of the class, (iv) are subject to appeals or motions, (v) involve significant factual issues to be resolved, including with respect to the amount of damages, (vi) do not specify the amount of damages sought or (vii) seek very large damages based on novel and complex damage and liability legal theories. Accordingly, the Corporation cannot reasonably estimate the eventual outcome of these pending matters, the timing of their ultimate resolution or what the eventual loss, fines or penalties, if any, related to each pending matter will be.

In accordance with applicable accounting guidance, the Corporation records accruals for litigation and regulatory matters when those matters present loss contingencies that are both probable and reasonably estimable. When loss contingencies are not both probable and reasonably estimable, the Corporation does not record accruals. No material accruals have been recorded for pending litigation or threatened legal actions or regulatory matters.

For a limited number of matters for which a loss is reasonably possible in future periods, whether in excess of an accrued liability or where there is no accrued liability, the Corporation is able to estimate a range of possible loss. As of September 30, 2020, the Corporation has estimated the range of reasonably possible loss for these matters to be from zero to approximately $15 million in the aggregate. The Corporation’s estimate with respect to the aggregate range of reasonably possible loss is based upon currently available information and is subject to significant judgment and a variety of assumptions and known and unknown uncertainties. The matters underlying the estimated range will change from time to time, and actual results may vary significantly from the current estimate.

In certain other pending matters, there may be a range of reasonably possible loss (including reasonably possible loss in excess of amounts accrued) that cannot be reasonably estimated for the reasons described above. Such matters are not included in the estimated range of reasonably possible loss discussed above.

In 2015, Northern Trust Fiduciary Services (Guernsey) Limited (NTFS), an indirect subsidiary of the Corporation, was charged by a French investigating magistrate judge with complicity in estate tax fraud in connection with the administration of two trusts for which it serves as trustee. Charges also were brought against a number of other persons and entities related to this matter. In 2017, a French court found no estate tax fraud had occurred and NTFS and all other persons and entities charged were acquitted. The Public Prosecutor’s Office of France appealed the court decision and in June 2018 a French appellate court issued its opinion on the matter, acquitting all persons and entities charged, including NTFS. The Public Prosecutor’s Office of France has appealed the appellate court’s decision to the Cour de Cassation, the highest court in France. As trustee, NTFS provided no tax advice and had no involvement in the preparation or filing of the challenged estate tax filings.

Visa Class B Common Shares. Northern Trust, as a member of Visa U.S.A. Inc. (Visa U.S.A.) and in connection with the 2007 restructuring of Visa U.S.A. and its affiliates and the 2008 initial public offering of Visa Inc. (Visa), received certain Visa

Class B common shares. The Visa Class B common shares are subject to certain selling restrictions until the final resolution of certain litigation related to interchange fees involving Visa (the covered litigation), at which time the shares are convertible into Visa Class A common shares based on a conversion rate dependent upon the ultimate cost of resolving the covered litigation. On June 28, 2018, and September 27, 2019, Visa deposited an additional $600 million and $300 million, respectively, into an escrow account previously established with respect to the covered litigation. As a result of the additional contributions to the escrow account, the rate at which Visa Class B common shares will convert into Visa Class A common shares was reduced.

In September 2018, Visa reached a proposed class settlement agreement covering damage claims but not injunctive relief claims regarding the covered litigation. In December 2019, the district court granted final approval for the proposed class settlement agreement. Certain merchants have opted out of the class settlement and are pursuing claims separately, while other merchants have appealed the approval order granted by the district court. The ultimate resolution of the covered litigation, the timing for removal of the selling restrictions on the Visa Class B common shares and the rate at which such shares will ultimately convert into Visa Class A common shares are uncertain.

In June 2016 and 2015, Northern Trust recorded a $123.1 million and $99.9 million net gain on the sale of 1.1 million and 1.0 million of its Visa Class B common shares, respectively. These sales do not affect Northern Trust’s risk related to the impact of the covered litigation on the rate at which such shares will ultimately convert into Visa Class A common shares. Northern Trust continued to hold approximately 4.1 million Visa Class B common shares, which are recorded at their original cost basis of zero, as of September 30, 2020 and December 31, 2019.

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Derivative Financial Instruments

Northern Trust is a party to various derivative financial instruments that are used in the normal course of business to meet the needs of its clients, as part of its trading activity for its own account and as part of its risk management activities. These instruments may include foreign exchange contracts, interest rate contracts, total return swap contracts, and swaps related to the sale of certain Visa Class B common shares.

Foreign exchange contracts are agreements to exchange specific amounts of currencies at a future date, at a specified rate of exchange. Foreign exchange contracts are entered into primarily to meet the foreign exchange needs of clients. Foreign exchange contracts are also used for trading and risk management purposes. For risk management purposes, Northern Trust uses foreign exchange contracts to reduce its exposure to changes in foreign exchange rates relating to certain forecasted non-functional-currency-denominated revenue and expenditure transactions, foreign-currency-denominated assets and liabilities, including debt securities, and net investments in non-U.S. affiliates.

Interest rate contracts include swap and option contracts. Interest rate swap contracts involve the exchange of fixed and floating rate interest payment obligations without the exchange of the underlying principal amounts. Northern Trust enters into interest rate swap contracts with its clients and also may utilize such contracts to reduce or eliminate the exposure to changes in the cash flows or fair value of hedged assets or liabilities due to changes in interest rates. Interest rate option contracts may include caps, floors, collars and swaptions, and provide for the transfer or reduction of interest rate risk, typically in exchange for a fee. Northern Trust enters into option contracts primarily as a seller of interest rate protection to clients. Northern Trust receives a fee at the outset of the agreement for the assumption of the risk of an unfavorable change in interest rates. This assumed interest rate risk is then mitigated by entering into an offsetting position with an outside counterparty. Northern Trust may also purchase or enter into option contracts for risk management purposes including to reduce the exposure to changes in the cash flows of hedged assets due to changes in interest rates.

The following table shows the notional and fair values of all derivative financial instruments as of September 30, 2020 and December 31, 2019.

TABLE 75: NOTIONAL AND FAIR VALUES OF DERIVATIVE FINANCIAL INSTRUMENTS

	SEPTEMBER 30, 2020						DECEMBER 31, 2019
	NOTIONAL VALUE		FAIR VALUE				NOTIONAL VALUE		FAIR VALUE
(In Millions)			ASSET(1)		LIABILITY(2)				ASSET(1)		LIABILITY(2)
Derivatives Designated as Hedging under GAAP
Interest Rate Contracts
Fair Value Hedges	$	5,357.8	$	10.2	$	18.9	$	4,538.2	$	20.3	$	20.9
Cash Flow Hedges	150.0		0.3		—		200.0		0.2		0.2
Foreign Exchange Contracts
Cash Flow Hedges	5,882.7		14.0		28.9		1,661.5		8.5		11.5
Net Investment Hedges	3,165.3		20.8		83.3		2,873.8		73.7		11.9
Total Derivatives Designated as Hedging under GAAP	$	14,555.8	$	45.3	$	131.1	$	9,273.5	$	102.7	$	44.5
Derivatives Not Designated as Hedging under GAAP
Non-Designated Risk Management Derivatives
Foreign Exchange Contracts	$	79.2	$	2.0	$	0.6	$	176.5	$	0.9	$	0.7
Other Financial Derivatives(3)	681.5		—		32.3		640.3		—		33.4
Total Non-Designated Risk Management Derivatives	$	760.7	$	2.0	$	32.9	$	816.8	$	0.9	$	34.1
Client-Related and Trading Derivatives
Foreign Exchange Contracts	$	255,799.4	$	2,242.7	$	2,213.5	$	291,533.6	$	3,151.7	$	3,158.1
Interest Rate Contracts	10,213.8		323.2		123.3		8,976.8		132.4		76.3
Total Client-Related and Trading Derivatives	$	266,013.2	$	2,565.9	$	2,336.8	$	300,510.4	$	3,284.1	$	3,234.4
Total Derivatives Not Designated as Hedging under GAAP	$	266,773.9	$	2,567.9	$	2,369.7	$	301,327.2	$	3,285.0	$	3,268.5
Total Gross Derivatives	$	281,329.7	$	2,613.2	$	2,500.8	$	310,600.7	$	3,387.7	$	3,313.0
Less: Netting(4)			1,408.3		1,603.3				2,338.0		1,618.4
Total Derivative Financial Instruments			$	1,204.9	$	897.5			$	1,049.7	$	1,694.6

⁽¹⁾    Derivative assets are reported in Other Assets on the consolidated balance sheets.

⁽²⁾    Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets.

⁽³⁾    This line includes swaps related to sales of certain Visa Class B common shares.

⁽⁴⁾    See further detail in Note 21 — Offsetting of Assets and Liabilities.

Notional amounts of derivative financial instruments do not represent credit risk, and are not recorded in the consolidated balance sheets. They are used merely to express the volume of this activity. Northern Trust’s credit-related risk of loss is limited to the positive fair value of the derivative instrument, net of any collateral received, which is significantly less than the notional amount.

All derivative financial instruments, whether designated as hedges or not, are recorded on the consolidated balance sheets at fair value within Other Assets or Other Liabilities. Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty.

Hedging Derivative Instruments Designated under GAAP. Northern Trust uses derivative instruments to hedge its exposure to foreign currency, interest rate, and equity price. Certain hedging relationships are formally designated and qualify for hedge accounting under GAAP as fair value, cash flow or net investment hedges. Other derivatives that are entered into for risk management purposes as economic hedges are not formally designated as hedges and changes in fair value are recognized currently in Other Operating Income within the consolidated statements of income (see below section “Derivative Instruments Not Designated as Hedging under GAAP”).

In order to qualify for hedge accounting, a formal assessment is performed on a calendar-quarter basis to verify that derivatives used in designated hedging transactions continue to be highly effective in offsetting the changes in fair value or cash flows of the hedged item. If a derivative ceases to be highly effective, matures, is sold or is terminated, or if a hedged forecasted transaction is no longer probable of occurring, hedge accounting is terminated and the derivative is treated as if it were a trading instrument.

Fair Value Hedges. Derivatives are designated as fair value hedges to limit Northern Trust’s exposure to changes in the fair value of assets and liabilities due to movements in interest rates. Northern Trust enters into interest rate swaps to hedge changes in fair value of available for sale debt securities and long-term subordinated debt and senior notes. Northern Trust applied the

“shortcut” method of accounting, available under GAAP, which assumes there is perfect effectiveness in a hedge, for all of its fair value hedges during the three- and nine- month periods ended September 30, 2020 and 2019. Changes in the fair value of the derivative instrument and changes in the fair value of the hedged asset or liability attributable to the hedged risk are recognized currently in earnings within the same income statement line item.

Cash Flow Hedges. Derivatives are also designated as cash flow hedges in order to minimize the variability in cash flows of earning assets or forecasted transactions caused by movements in interest or foreign exchange rates. Northern Trust enters into foreign exchange contracts to hedge changes in cash flows due to movements in foreign exchange rates of forecasted foreign- currency-denominated transactions and foreign-currency-denominated debt securities. Northern Trust also enters into interest rate contracts to hedge changes in cash flows due to movements in interest rates of available for sale debt securities. The change in fair value of cash flow hedging derivative instruments are recorded in AOCI and reclassified to earnings when the hedged forecasted transaction impacts earnings within the same income statement line item.

There were no material gains or losses reclassified into earnings during the three- and nine- month periods ended September 30, 2020 and 2019, as a result of the discontinuance of forecasted transactions that were no longer probable of occurring. It is estimated that net gains of $0.9 million and net losses of $16.3 million will be reclassified into net income within the next twelve months relating to cash flow hedges of foreign-currency-denominated transactions and cash flow hedges of foreign-currency-denominated debt securities, respectively. It is estimated that net gains of $0.3 million will be reclassified into net income upon the receipt of interest payments on earning assets within the next twelve months relating to cash flow hedges of available for sale debt securities. As of September 30, 2020, 23 months was the maximum length of time over which the exposure to variability in future cash flows of forecasted foreign-currency-denominated transactions was being hedged.

The following tables provide fair value and cash flow hedge derivative gains and losses recognized in income during the three- and nine- month periods ended September 30, 2020 and 2019.

TABLE 76: LOCATION AND AMOUNT OF FAIR VALUE AND CASH FLOW HEDGE DERIVATIVE GAINS AND LOSSES RECORDED IN INCOME

(In Millions)	INTEREST INCOME				INTEREST EXPENSE				OTHER OPERATING INCOME
THREE MONTHS ENDED SEPTEMBER 30,	2020		2019		2020		2019		2020		2019
Total amounts on the consolidated statements of income	$	355.4	$	620.8	$	26.8	$	203.1	$	53.5	$	45.1
Gains (Losses) on fair value hedges recognized on
Interest Rate Contracts
Recognized on derivatives	15.1		(14.9)		(2.9)		51.4		—		—
Recognized on hedged items	(15.1)		14.9		2.9		(51.4)		—		—
Amounts related to interest settlements on derivatives	(14.2)		2.8		(2.5)		(6.0)		—		—
Total gains (losses) recognized on fair value hedges	$	(14.2)	$	2.8	$	(2.5)	$	(6.0)	$	—	$	—
Gains (Losses) on cash flow hedges recognized on
Foreign Exchange Contracts
Net gains (losses) reclassified from AOCI to net income	$	4.2	$	2.7	$	—	$	—	$	0.3	$	1.4
Interest Rate Contracts
Net gains (losses) reclassified from AOCI to net income	0.2		(0.1)		—		—		—		—
Total gains (losses) reclassified from AOCI to net income on cash flow hedges	$	4.4	$	2.6	$	—	$	—	$	0.3	$	1.4

(In Millions)	INTEREST INCOME				INTEREST EXPENSE				OTHER OPERATING INCOME
NINE MONTHS ENDED SEPTEMBER 30,	2020		2019		2020		2019		2020		2019
Total amounts on the consolidated statements of income	$	1,290.9	$	1,923.8	$	182.1	$	666.7	$	144.4	$	113.0
Gains (Losses) on fair value hedges recognized on
Interest Rate Contracts
Recognized on derivatives	(75.6)		(99.0)		152.1		141.6		—		—
Recognized on hedged items	75.6		99.0		(152.1)		(141.6)		—		—
Amounts related to interest settlements on derivatives	(11.6)		13.3		6.1		(3.9)		—		—
Total gains (losses) recognized on fair value hedges	$	(11.6)	$	13.3	$	6.1	$	(3.9)	$	—	$	—
Gains (Losses) on cash flow hedges recognized on
Foreign Exchange Contracts
Net gains (losses) reclassified from AOCI to net income	$	10.8	$	20.8	$	—	$	—	$	0.1	$	1.1
Interest Rate Contracts
Net gains (losses) reclassified from AOCI to net income	0.3		(0.5)		—		—		—		—
Total gains (losses) reclassified from AOCI to net income on cash flow hedges	$	11.1	$	20.3	$	—	$	—	$	0.1	$	1.1

The following table provides the impact of fair value hedge accounting on the carrying value of the designated hedged items as of September 30, 2020 and December 31, 2019.

TABLE 77: HEDGED ITEMS IN FAIR VALUE HEDGES

	SEPTEMBER 30, 2020				DECEMBER 31, 2019
(In Millions)	CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(1)		CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(2)
Available for Sale Debt Securities(3)	$	2,826.2	$	63.3	$	2,981.0	$	3.3
Senior Notes and Long-Term Subordinated Debt	2,745.0		261.8		1,748.5		126.9
Total	$	5,571.2	$	325.1	$	4,729.5	$	130.2

⁽¹⁾    The cumulative hedge accounting basis adjustment includes $6.7 million related to discontinued hedging relationships of available for sale debt securities as of September 30, 2020. There are no amounts related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of September 30, 2020.

⁽²⁾    The cumulative hedge accounting basis adjustment includes $1.5 million related to discontinued hedging relationships of available for sale debt securities as of December 31, 2019. There were no amounts related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of December 31, 2019.

⁽³⁾    Carrying value represents amortized cost.

Net Investment Hedges. Certain foreign exchange contracts are designated as net investment hedges to minimize Northern Trust’s exposure to variability in the foreign currency translation of net investments in non-U.S. branches and subsidiaries. Net investment hedge losses of $117.4 million and gains of $107.6 million were recognized in AOCI related to foreign exchange contracts for the three months ended September 30, 2020 and 2019, respectively. Net investment hedge losses of $29.8 million and gains of $144.1 million were recognized in AOCI related to foreign exchange contracts for the nine months ended September 30, 2020 and 2019, respectively.

Derivative Instruments Not Designated as Hedging under GAAP. Northern Trust’s derivative instruments that are not designated as hedging under GAAP include derivatives for purposes of client-related and trading activities, as well as other risk management purposes. These activities consist principally of providing foreign exchange services to clients in connection with Northern Trust’s global custody business. However, in the normal course of business, Northern Trust also engages in trading of currencies for its own account.

Non-designated risk management derivatives include foreign exchange contracts entered into to manage the foreign currency risk of non-U.S.-dollar-denominated assets and liabilities, the net investment in certain non-U.S. affiliates, commercial loans and forecasted foreign-currency-denominated transactions. Swaps related to sales of certain Visa Class B common shares were entered into pursuant to which Northern Trust retains the risks associated with the ultimate conversion of the Visa Class B common shares into Visa Class A common shares. Total return swaps are entered into to manage the equity price risk associated with certain investments.

Changes in the fair value of derivative instruments not designated as hedges under GAAP are recognized currently in income. The following table provides the location and amount of gains and losses recorded in the consolidated statements of income for the three and nine months ended September 30, 2020 and 2019 for derivative instruments not designated as hedges under GAAP.

TABLE 78: LOCATION AND AMOUNT OF GAINS AND LOSSES RECORDED IN INCOME FOR DERIVATIVES NOT DESIGNATED AS HEDGING UNDER GAAP

(In Millions)	DERIVATIVE GAINS (LOSSES) LOCATION RECOGNIZED IN INCOME	AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME
		THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
		2020		2019		2020		2019
Non-designated risk management derivatives
Foreign Exchange Contracts	Other Operating Income	$	4.2	$	(1.8)	$	3.8	$	(1.7)
Other Financial Derivatives(1)	Other Operating Income	(5.3)		(6.4)		(11.0)		(17.8)
Gains (Losses) from non-designated risk management derivatives		$	(1.1)	$	(8.2)	$	(7.2)	$	(19.5)
Client-related and trading derivatives
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	61.6	$	59.7	$	221.8	$	186.4
Interest Rate Contracts	Security Commissions and Trading Income	2.3		4.9		18.5		9.2
Gains (Losses) from client-related and trading derivatives		$	63.9	$	64.6	$	240.3	$	195.6
Total gains (losses) from derivatives not designated as hedging under GAAP		$	62.8	$	56.4	$	233.1	$	176.1

⁽¹⁾    This line includes swaps related to the sale of certain Visa Class B common shares and total return swap contracts.

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Offsetting of Assets and Liabilities

9 Months Ended

Sep. 30, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Offsetting of Assets and Liabilities

Offsetting of Assets and Liabilities

Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty.

The following table provides information regarding the offsetting of derivative assets and securities purchased under agreements to resell within the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

TABLE 79: OFFSETTING OF DERIVATIVE ASSETS AND SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL

	SEPTEMBER 30, 2020
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(4)
Derivative Assets(1)
Foreign Exchange Contracts Over the Counter (OTC)	$	1,764.3	$	1,405.7	$	358.6	$	29.7	$	328.9
Interest Rate Swaps OTC	333.7		2.6		331.1		—		331.1
Total Derivatives Subject to a Master Netting Arrangement	2,098.0		1,408.3		689.7		29.7		660.0
Total Derivatives Not Subject to a Master Netting Arrangement	515.2		—		515.2		0.9		514.3
Total Derivatives	2,613.2		1,408.3		1,204.9		30.6		1,174.3
Securities Purchased under Agreements to Resell(3)	$	1,533.4	$	—	$	1,533.4	$	1,533.4	$	—

	DECEMBER 31, 2019
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(4)
Derivative Assets(1)
Foreign Exchange Contracts OTC	$	2,691.1	$	2,334.1	$	357.0	$	16.5	$	340.5
Interest Rate Swaps OTC	151.9		3.9		148.0		—		148.0
Interest Rate Swaps Exchange Cleared	1.0		—		1.0		—		1.0
Total Derivatives Subject to a Master Netting Arrangement	2,844.0		2,338.0		506.0		16.5		489.5
Total Derivatives Not Subject to a Master Netting Arrangement	543.7		—		543.7		0.3		543.4
Total Derivatives	3,387.7		2,338.0		1,049.7		16.8		1,032.9
Securities Purchased under Agreements to Resell(3)	$	707.8	$	—	$	707.8	$	707.8	$	—

⁽¹⁾Derivative assets are reported in Other Assets on the consolidated balance sheets. Other Assets (excluding derivative assets) totaled $7.3 billion and $7.4 billion as of September 30, 2020 and December 31, 2019, respectively.

⁽²⁾Including cash collateral received from counterparties.

⁽³⁾Securities purchased under agreements to resell are reported in Federal Funds Sold and Securities Purchased under Agreements to Resell on the consolidated balance sheets. There were no Federal Funds Sold as of September 30, 2020 and $5.0 million of Federal Funds Sold as of December 31, 2019.

⁽⁴⁾Northern Trust did not possess any cash collateral that was not offset in the consolidated balance sheets that could have been used to offset the net amounts presented in the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

The following table provides information regarding the offsetting of derivative liabilities and securities sold under agreements to repurchase within the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

TABLE 80: OFFSETTING OF DERIVATIVE LIABILITIES AND SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE

	SEPTEMBER 30, 2020
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(3)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	1,969.2	$	1,493.6	$	475.6	$	—	$	475.6
Interest Rate Swaps OTC	142.3		109.7		32.6		—		32.6
Other Financial Derivatives	32.3		—		32.3		—		32.3
Total Derivatives Subject to a Master Netting Arrangement	2,143.8		1,603.3		540.5		—		540.5
Total Derivatives Not Subject to a Master Netting Arrangement	357.0		—		357.0		—		357.0
Total Derivatives	2,500.8		1,603.3		897.5		—		897.5
Securities Sold under Agreements to Repurchase	$	269.8	$	—	$	269.8	$	269.8	$	—

	DECEMBER 31, 2019
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(3)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	2,181.6	$	1,548.6	$	633.0	$	0.1	$	632.9
Interest Rate Swaps OTC	96.7		57.3		39.4		—		39.4
Interest Rate Swaps Exchange Cleared	0.7		—		0.7		—		0.7
Other Financial Derivatives	33.4		12.5		20.9		—		20.9
Total Derivatives Subject to a Master Netting Arrangement	2,312.4		1,618.4		694.0		0.1		693.9
Total Derivatives Not Subject to a Master Netting Arrangement	1,000.6		—		1,000.6		—		1,000.6
Total Derivatives	3,313.0		1,618.4		1,694.6		0.1		1,694.5
Securities Sold under Agreements to Repurchase	$	489.7	$	—	$	489.7	$	489.7	$	—

⁽¹⁾Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets. Other Liabilities (excluding derivative liabilities) totaled $3.6 billion and $3.1 billion as of September 30, 2020 and December 31, 2019, respectively.

⁽²⁾Including cash collateral deposited with counterparties.

⁽³⁾Northern Trust did not place any cash collateral with counterparties that was not offset in the consolidated balance sheets that could have been used to offset the net amounts presented in the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

All of Northern Trust’s securities sold under agreements to repurchase (repurchase agreements) and securities purchased under agreements to resell (reverse repurchase agreements) involve the transfer of financial assets in exchange for cash subject to a right and obligation to repurchase those assets for an agreed upon amount. In the event of a repurchase failure, the cash or financial assets are available for offset. All of Northern Trust’s repurchase agreements and reverse repurchase agreements are subject to a master netting arrangement, which sets forth the rights and obligations for repurchase and offset. Under the master netting arrangement, Northern Trust is entitled to offset receivables from and collateral placed with a single counterparty against obligations owed to that counterparty. In addition, collateral held by Northern Trust can be offset against receivables from that counterparty. However, Northern Trust’s repurchase agreements and reverse repurchase agreements do not meet the requirements to net under GAAP.

Derivative asset and liability positions with a single counterparty can be offset against each other in cases where legally enforceable master netting arrangements or similar agreements exist. Derivative assets and liabilities can be further offset by cash collateral received from, and deposited with, the transacting counterparty. The basis for this view is that, upon termination of transactions subject to a master netting arrangement or similar agreement, the individual derivative receivables do not represent resources to which general creditors have rights and individual derivative payables do not represent claims that are equivalent to the claims of general creditors.

Credit risk associated with derivative instruments relates to the failure of the counterparty and the failure of Northern Trust to pay based on the contractual terms of the agreement, and is generally limited to the unrealized fair value gains and losses on these instruments, net of any collateral received or deposited. The amount of credit risk will increase or decrease during the lives of the instruments as interest rates, foreign exchange rates, or equity prices fluctuate. Northern Trust’s risk is controlled by

limiting such activity to an approved list of counterparties and by subjecting such activity to the same credit and quality controls as are followed in lending and investment activities. Credit Support Annexes and other similar agreements are currently in place with a number of Northern Trust’s counterparties which mitigate the aforementioned credit risk associated with derivative activity conducted with those counterparties by requiring that significant net unrealized fair value gains be supported by collateral placed with Northern Trust.

Additional cash collateral received from and deposited with derivative counterparties totaling $281.0 million and $280.8 million, respectively, as of September 30, 2020, and $196.3 million and $2.0 million, respectively, as of December 31, 2019, was not offset against derivative assets and liabilities in the consolidated balance sheets as the amounts exceeded the net derivative positions with those counterparties.

Certain master netting arrangements Northern Trust enters into with derivative counterparties contain credit-risk-related contingent features in which the counterparty has the option to declare Northern Trust in default and accelerate cash settlement of net derivative liabilities with the counterparty in the event Northern Trust’s credit rating falls below specified levels. The aggregate fair value of all derivative instruments with credit-risk-related contingent features that were in a liability position was $565.5 million and $766.2 million at September 30, 2020 and December 31, 2019, respectively. Cash collateral amounts deposited with derivative counterparties on those dates included $184.4 million and $327.1 million, respectively, posted against these liabilities, resulting in a net maximum amount of termination payments that could have been required at September 30, 2020 and December 31, 2019, of $381.1 million and $439.1 million, respectively. Accelerated settlement of these liabilities would not have a material effect on the consolidated financial position or liquidity of Northern Trust.

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Recent Accounting Pronouncements (Policies)

9 Months Ended

Sep. 30, 2020

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Pronouncements

On January 1, 2020, Northern Trust adopted Accounting Standards Update (ASU) No. 2016-13, “Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (ASU 2016-13). ASU 2016-13 significantly changed the way impairment of financial instruments is recognized by requiring immediate recognition of estimated credit losses expected to occur over the remaining life of financial instruments. The main provisions of ASU 2016-13 include (1) replacing the “incurred loss” approach under current GAAP with an “expected loss” model for instruments measured at amortized cost, (2) requiring entities to record an allowance for available for sale debt securities rather than reduce the carrying amount of the investments, as is required by the other-than-temporary-impairment model under legacy GAAP, and (3) a simplified accounting model for purchased credit-impaired debt securities and loans.

Upon adoption of ASU 2016-13, Northern Trust recorded a $13.7 million increase in the allowance for credit losses with a corresponding cumulative effect adjustment to decrease retained earnings by $10.1 million, net of income taxes, on January 1, 2020. Northern Trust did not restate comparative periods for the effects of applying ASU 2016-13. There was no significant impact to Northern Trust’s consolidated results of operations. Please refer to Note 7 — Allowance for Credit Losses for further information.

On January 1, 2020, Northern Trust adopted ASU No. 2017-04, “Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” (ASU 2017-04). ASU 2017-04 amends the subsequent measurement of goodwill whereby Step 2 from the goodwill impairment test is eliminated. As a result, the goodwill impairment test is performed by comparing the fair value of a reporting unit to its carrying value and an impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value, not to exceed the total amount of goodwill allocated to that reporting unit. Upon adoption of ASU 2017-04, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On January 1, 2020, Northern Trust adopted ASU No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement” (ASU 2018-13). The primary objective of ASU 2018-13 is to improve the effectiveness of disclosures in the notes to financial statements. Upon adoption of ASU 2018-13, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On January 1, 2020, Northern Trust adopted ASU No. 2018-15, “Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force)” (ASU 2018-15). ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal use software license). Upon adoption of ASU 2018-15, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On January 1, 2020, Northern Trust adopted ASU No. 2018-17, “Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities” (ASU 2018-17). ASU 2018-17 requires that indirect interests held through related parties in common control arrangements should be considered on a proportional basis (rather than as the equivalent of a direct interest in its entirety) for determining whether fees paid to decision makers and service providers are variable interests. Upon

adoption of ASU 2018-17, there was no significant impact to Northern Trust’s consolidated financial condition or results of operations.

On April 1, 2020, Northern Trust adopted ASU No. 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (ASU 2020-04). The global transition toward alternative reference rates and away from referencing the London Interbank Offered Rate (LIBOR) and other interbank offered rates (Reference Rate Reform) is expected to have a significant impact on the volume of contract modifications, hedge accounting, and other transactions that reference LIBOR or another reference rate expected to be discontinued because of Reference Rate Reform. ASU 2020-04 provides temporary optional expedients and exceptions for applying GAAP to contract modifications, hedging relationships, and other transactions affected by Reference Rate Reform if certain criteria are met. The main provisions of ASU 2020-04 provide the following optional expedients: (1) simplification of the accounting evaluations under current GAAP for contract modifications, including loan, debt, lease and other contracts with potential embedded derivatives, if qualifying criteria are met (2) preservation of hedging relationships without dedesignation upon certain changes to the critical terms of an existing hedging relationship due to Reference Rate Reform and other optional hedge accounting relief provisions and (3) a one-time election to sell or transfer, or both sell and transfer, debt securities classified as held to maturity that reference a rate affected by Reference Rate Reform and are classified as held to maturity before January 1, 2020.

The optional expedients in ASU 2020-04 for contract modifications and hedging relationships are applied prospectively, while the one-time election to sell or transfer, or both sell and transfer debt securities classified as held to maturity may be made at any time after March 12, 2020. The optional expedients and exceptions provided by ASU 2020-04 do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022, except for hedging relationships existing as of December 31, 2022 for which an entity has elected certain optional expedients and which are retained through the end of the hedging relationship. Upon adoption of ASU 2020-04, there was no significant impact on Northern Trust’s consolidated financial condition or results of operations. Northern Trust expects to elect the optional expedients provided in ASU 2020-04 and does not expect a significant impact on Northern Trust’s consolidated financial condition or results of operations as a result of electing such expedients.

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurement Inputs and Valuation Techniques

The following table presents the fair values of Northern Trust’s Level 3 liabilities as of September 30, 2020 and December 31, 2019, as well as the valuation techniques, significant unobservable inputs, and quantitative information used to develop significant unobservable inputs for such liabilities as of such dates.

TABLE 36: LEVEL 3 SIGNIFICANT UNOBSERVABLE INPUTS

	SEPTEMBER 30, 2020
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$32.3 million	Discounted Cash Flow	Conversion Rate	1.62x			1.62x
			Visa Class A Appreciation	8.70%			8.70%
			Expected Duration	12	-	33 months	20 months

⁽¹⁾ Weighted average of expected duration based on scenario probability.

	DECEMBER 31, 2019
FINANCIAL INSTRUMENT	FAIR VALUE	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES(1)
Swaps Related to Sale of Certain Visa Class B Common Shares	$33.4 million	Discounted Cash Flow	Conversion Rate	1.62x			1.62x
			Visa Class A Appreciation	8.54%			8.54%
			Expected Duration	12	-	36 months	22 months

⁽¹⁾ Weighted average of expected duration based on scenario probability.

The following table presents the fair values of Northern Trust’s Level 3 assets that were measured at fair value on a nonrecurring basis as of September 30, 2020 and December 31, 2019, as well as the valuation technique, significant unobservable inputs and quantitative information used to develop the significant unobservable inputs for such assets as of such dates.

TABLE 39: LEVEL 3 NONRECURRING BASIS SIGNIFICANT UNOBSERVABLE INPUTS

	SEPTEMBER 30, 2020
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES			WEIGHTED-AVERAGE INPUT VALUES
Loans	$21.2 million	Market Approach	Discount factor applied to real estate collateral-based loans to reflect realizable value	15.0%	-	20.0%	15.2%

⁽¹⁾ Includes real estate collateral-based loans and other collateral-based loans.

	DECEMBER 31, 2019
FINANCIAL INSTRUMENT	FAIR VALUE(1)	VALUATION TECHNIQUE	UNOBSERVABLE INPUTS	INPUT VALUES				WEIGHTED-AVERAGE INPUT VALUES
Loans	$8.0 million	Market Approach	Discount factor applied to real estate collateral-based loans to reflect realizable value	15.0	%	-	20.0%	15.3%

⁽¹⁾ Includes real estate collateral-based loans and other collateral-based loans.

Recurring Basis Hierarchy Leveling

The following table presents assets and liabilities measured at fair value on a recurring basis as of September 30, 2020 and December 31, 2019, segregated by fair value hierarchy level.

TABLE 37: RECURRING BASIS HIERARCHY LEVELING

	SEPTEMBER 30, 2020
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	4,165.2	$	—	$	—	$	—	$	4,165.2
Obligations of States and Political Subdivisions	—		2,600.5		—		—		2,600.5
Government Sponsored Agency	—		24,568.8		—		—		24,568.8
Non-U.S. Government	—		937.6		—		—		937.6
Corporate Debt	—		2,627.4		—		—		2,627.4
Covered Bonds	—		516.8		—		—		516.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,552.8		—		—		2,552.8
Other Asset-Backed	—		3,559.4		—		—		3,559.4
Commercial Mortgage-Backed	—		1,015.2		—		—		1,015.2
Other	—		7.3		—		—		7.3
Total Available for Sale	4,165.2		38,385.8		—		—		42,551.0
Trading Account	0.3		0.3		—		—		0.6
Total Available for Sale and Trading Debt Securities	4,165.5		38,386.1		—		—		42,551.6
Other Assets
Derivative Assets
Foreign Exchange Contracts	—		2,279.5		—		(1,405.7)		873.8
Interest Rate Contracts	—		333.7		—		(2.6)		331.1
Total Derivative Assets	—		2,613.2		—		(1,408.3)		1,204.9
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		2,326.3		—		(1,493.6)		832.7
Interest Rate Contracts	—		142.2		—		(109.7)		32.5
Other Financial Derivatives(1)	—		—		32.3		—		32.3
Total Derivative Liabilities	$	—	$	2,468.5	$	32.3	$	(1,603.3)	$	897.5

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of September 30, 2020, derivative assets and liabilities shown above also include reductions of $212.7 million and $407.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

⁽¹⁾This line consists of swaps related to the sale of certain Visa Class B common shares.

	DECEMBER 31, 2019
(In Millions)	LEVEL 1		LEVEL 2		LEVEL 3		NETTING		ASSETS/LIABILITIES AT FAIR VALUE
Debt Securities
Available for Sale
U.S. Government	$	4,549.1	$	—	$	—	$	—	$	4,549.1
Obligations of States and Political Subdivisions	—		1,615.3		—		—		1,615.3
Government Sponsored Agency	—		23,271.2		—		—		23,271.2
Non-U.S. Government	—		3.3		—		—		3.3
Corporate Debt	—		2,402.7		—		—		2,402.7
Covered Bonds	—		769.9		—		—		769.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	—		2,127.6		—		—		2,127.6
Other Asset-Backed	—		3,330.5		—		—		3,330.5
Commercial Mortgage-Backed	—		797.7		—		—		797.7
Other	—		9.0		—		—		9.0
Total Available for Sale	4,549.1		34,327.2		—		—		38,876.3
Trading Account	—		0.3		—		—		0.3
Total Available for Sale and Trading Debt Securities	4,549.1		34,327.5		—		—		38,876.6
Other Assets
Derivative Assets
Foreign Exchange Contracts	—		3,234.8		—		(2,334.1)		900.7
Interest Rate Contracts	—		152.9		—		(3.9)		149.0
Total Derivative Assets	—		3,387.7		—		(2,338.0)		1,049.7
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts	—		3,182.2		—		(1,548.6)		1,633.6
Interest Rate Contracts	—		97.4		—		(57.3)		40.1
Other Financial Derivatives(1)	—		—		33.4		(12.5)		20.9
Total Derivative Liabilities	$	—	$	3,279.6	$	33.4	$	(1,618.4)	$	1,694.6

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2019, derivative assets and liabilities shown above also include reductions of $1,136.8 million and $417.2 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(1) This line consists of swaps related to the sale of certain Visa Class B common shares.

Changes in Level 3 Liabilities

The following table presents the changes in Level 3 liabilities for the three and nine months ended September 30, 2020 and 2019.

TABLE 38: CHANGES IN LEVEL 3 LIABILITIES

(In Millions)	SWAPS RELATED TO SALE OF CERTAIN VISA CLASS B COMMON SHARES
THREE MONTHS ENDED SEPTEMBER 30,	2020		2019
Fair Value at July 1	$	31.3	$	34.7
Total (Gains) Losses:
Included in Earnings(1)	5.3		6.7
Purchases, Issues, Sales, and Settlements
Settlements	(4.3)		(3.7)
Fair Value at September 30	$	32.3	$	37.7

⁽¹⁾ (Gains) losses are recorded in Other Operating Income on the consolidated statements of income.

NINE MONTHS ENDED SEPTEMBER 30,	2020		2019
Fair Value at January 1	$	33.4	$	32.8
Total (Gains) Losses:
Included in Earnings(1)	11.0		14.9
Purchases, Issues, Sales, and Settlements
Settlements	(12.1)		(10.0)
Fair Value at September 30	$	32.3	$	37.7

⁽¹⁾ (Gains) losses are recorded in Other Operating Income on the consolidated statements of income.

Fair Value of Financial Instruments

The following table summarizes the fair values of all financial instruments.

TABLE 40: FAIR VALUE OF FINANCIAL INSTRUMENTS

	SEPTEMBER 30, 2020
					FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
ASSETS
Cash and Due from Banks	$	4,737.5	$	4,737.5	$	4,737.5	$	—	$	—
Federal Reserve and Other Central Bank Deposits	39,244.6		39,244.6		—		39,244.6		—
Interest-Bearing Deposits with Banks	2,754.4		2,754.4		—		2,754.4		—
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,533.4		1,533.4		—		1,533.4		—
Debt Securities
Available for Sale(1)	42,551.0		42,551.0		4,165.2		38,385.8		—
Held to Maturity	16,754.0		16,746.5		99.0		16,647.5		—
Trading Account	0.6		0.6		0.3		0.3		—
Loans (excluding Leases)
Held for Investment	32,521.2		33,001.4		—		—		33,001.4
Client Security Settlement Receivables	2,296.8		2,296.8		—		2,296.8		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	239.7		239.7		—		239.7		—
Community Development Investments	761.3		761.3		—		761.3		—
Employee Benefit and Deferred Compensation	214.6		230.0		143.6		86.4		—
LIABILITIES
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	$	59,756.8	$	59,756.8	$	59,756.8	$	—	$	—
Savings Certificates and Other Time	1,486.7		1,496.5		—		1,496.5		—
Non U.S. Offices Interest-Bearing	61,345.6		61,345.6		—		61,345.6		—
Federal Funds Purchased	2,203.7		2,203.7		—		2,203.7		—
Securities Sold Under Agreements to Repurchase	269.8		269.8		—		269.8		—
Other Borrowings	5,771.7		5,772.9		—		5,772.9		—
Senior Notes	3,655.6		3,731.0		—		3,731.0		—
Long-Term Debt
Subordinated Debt	1,196.0		1,250.0		—		1,250.0		—
Floating Rate Capital Debt	277.7		255.6		—		255.6		—
Other Liabilities
Standby Letters of Credit	23.9		23.9		—		—		23.9
Loan Commitments	55.7		55.7		—		—		55.7
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	36.8	$	36.8	$	—	$	36.8	$	—
Liabilities	112.8		112.8		—		112.8		—
Interest Rate Contracts
Assets	10.5		10.5		—		10.5		—
Liabilities	18.9		18.9		—		18.9		—
Other Financial Derivatives
Liabilities(2)	32.3		32.3		—		—		32.3
Client-Related and Trading
Foreign Exchange Contracts
Assets	2,242.7		2,242.7		—		2,242.7		—
Liabilities	2,213.5		2,213.5		—		2,213.5		—
Interest Rate Contracts
Assets	323.2		323.2		—		323.2		—
Liabilities	123.3		123.3		—		123.3		—

⁽¹⁾ Refer to the table located on page 46 for the disaggregation of available for sale debt securities.

⁽²⁾ This line consists of swaps related to the sale of certain Visa Class B common shares.

	DECEMBER 31, 2019
					FAIR VALUE
(In Millions)	BOOK VALUE		TOTAL FAIR VALUE		LEVEL 1		LEVEL 2		LEVEL 3
ASSETS
Cash and Due from Banks	$	4,459.2	$	4,459.2	$	4,459.2	$	—	$	—
Federal Reserve and Other Central Bank Deposits	33,886.0		33,886.0		—		33,886.0		—
Interest-Bearing Deposits with Banks	4,877.1		4,877.1		—		4,877.1		—
Federal Funds Sold and Securities Purchased under Agreements to Resell	712.8		712.8		—		712.8		—
Debt Securities
Available for Sale(1)	38,876.3		38,876.3		4,549.1		34,327.2		—
Held to Maturity	12,284.5		12,249.3		138.8		12,110.5		—
Trading Account	0.3		0.3		—		0.3		—
Loans (excluding Leases)
Held for Investment	31,239.5		31,517.8		—		—		31,517.8
Client Security Settlement Receivables	845.7		845.7		—		845.7		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	301.2		301.2		—		301.2		—
Community Development Investments	749.3		749.3		—		749.3		—
Employee Benefit and Deferred Compensation	199.5		207.6		131.0		76.6		—
LIABILITIES
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	$	47,733.6	$	47,733.6	$	47,733.6	$	—	$	—
Savings Certificates and Other Time	986.7		994.2		—		994.2		—
Non U.S. Offices Interest-Bearing	60,400.3		60,400.3		—		60,400.3		—
Federal Funds Purchased	552.9		552.9		—		552.9		—
Securities Sold Under Agreements to Repurchase	489.7		489.7		—		489.7		—
Other Borrowings	6,744.8		6,745.9		—		6,745.9		—
Senior Notes	2,573.0		2,593.0		—		2,593.0		—
Long-Term Debt
Subordinated Debt	1,148.1		1,169.5		—		1,169.5		—
Floating Rate Capital Debt	277.7		262.1		—		262.1		—
Other Liabilities
Standby Letters of Credit	25.5		25.5		—		—		25.5
Loan Commitments	32.3		32.3		—		—		32.3
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	83.1	$	83.1	$	—	$	83.1	$	—
Liabilities	24.1		24.1		—		24.1		—
Interest Rate Contracts
Assets	20.5		20.5		—		20.5		—
Liabilities	21.1		21.1		—		21.1		—
Other Financial Derivatives
Liabilities(2)	33.4		33.4		—		—		33.4
Client-Related and Trading
Foreign Exchange Contracts
Assets	3,151.7		3,151.7		—		3,151.7		—
Liabilities	3,158.1		3,158.1		—		3,158.1		—
Interest Rate Contracts
Assets	132.4		132.4		—		132.4		—
Liabilities	76.3		76.3		—		76.3		—

⁽¹⁾ Refer to the table located on page 47 for the disaggregation of available for sale debt securities.    

⁽²⁾ This line consists of swaps related to the sale of certain Visa Class B common shares.

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Securities (Tables)

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale

The following tables provide the amortized cost and fair values at September 30, 2020 and December 31, 2019, and remaining maturities of debt securities available for sale at September 30, 2020.

TABLE 41: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF DEBT SECURITIES AVAILABLE FOR SALE

	SEPTEMBER 30, 2020
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	4,083.9	$	81.3	$	—	$	4,165.2
Obligations of States and Political Subdivisions	2,465.2		136.3		1.0		2,600.5
Government Sponsored Agency	24,162.6		427.4		21.2		24,568.8
Non-U.S. Government	936.8		0.9		0.1		937.6
Corporate Debt	2,548.7		80.9		2.2		2,627.4
Covered Bonds	508.5		8.3		—		516.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,486.4		66.7		0.3		2,552.8
Other Asset-Backed	3,522.3		46.6		9.5		3,559.4
Commercial Mortgage-Backed	937.5		78.4		0.7		1,015.2
Other	7.3		—		—		7.3
Total	$	41,659.2	$	926.8	$	35.0	$	42,551.0

	DECEMBER 31, 2019
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	4,527.5	$	26.7	$	5.1	$	4,549.1
Obligations of States and Political Subdivisions	1,604.0		24.6		13.3		1,615.3
Government Sponsored Agency	23,247.5		101.8		78.1		23,271.2
Non-U.S. Government	3.3		—		—		3.3
Corporate Debt	2,378.9		27.8		4.0		2,402.7
Covered Bonds	766.3		4.4		0.8		769.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,091.3		37.4		1.1		2,127.6
Other Asset-Backed	3,324.5		11.3		5.3		3,330.5
Commercial Mortgage-Backed	769.9		28.7		0.9		797.7
Other	9.0		—		—		9.0
Total	$	38,722.2	$	262.7	$	108.6	$	38,876.3

Remaining Maturity of Securities Available for Sale and Held to Maturity

TABLE 42: REMAINING MATURITY OF DEBT SECURITIES AVAILABLE FOR SALE

SEPTEMBER 30, 2020	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE		AMORTIZED COST		FAIR VALUE
U.S. Government	$	1,802.3	$	1,805.4	$	1,834.8	$	1,876.1	$	446.8	$	483.7	$	—	$	—	$	4,083.9	$	4,165.2
Obligations of States and Political Subdivisions	16.4		16.4		210.9		222.8		2,187.7		2,311.0		50.2		50.3		2,465.2		2,600.5
Government Sponsored Agency	6,077.0		6,160.5		9,520.9		9,669.4		6,111.1		6,224.2		2,453.6		2,514.7		24,162.6		24,568.8
Non-U.S. Government	737.9		738.2		40.7		40.6		158.2		158.8		—		—		936.8		937.6
Corporate Debt	547.1		552.9		2,001.6		2,074.5		—		—		—		—		2,548.7		2,627.4
Covered Bonds	24.4		24.5		484.1		492.3		—		—		—		—		508.5		516.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	334.9		335.1		2,046.0		2,111.8		105.5		105.9		—		—		2,486.4		2,552.8
Other Asset-Backed	412.4		419.0		2,658.0		2,690.0		356.0		354.5		95.9		95.9		3,522.3		3,559.4
Commercial Mortgage-Backed	16.6		16.7		336.2		360.3		567.1		620.6		17.6		17.6		937.5		1,015.2
Other	7.3		7.3		—		—		—		—		—		—		7.3		7.3
Total	$	9,976.3	$	10,076.0	$	19,133.2	$	19,537.8	$	9,932.4	$	10,258.7	$	2,617.3	$	2,678.5	$	41,659.2	$	42,551.0

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.

TABLE 45: REMAINING MATURITY OF DEBT SECURITIES HELD TO MATURITY

SEPTEMBER 30, 2020	ONE YEAR OR LESS				ONE TO FIVE YEARS				FIVE TO TEN YEARS				OVER TEN YEARS				TOTAL
(In Millions)	Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value		Amortized Cost		Fair Value
U.S. Government	$	99.0	$	99.0	$	—	$	—	$	—	$	—	$	—	$	—	$	99.0	$	99.0
Obligations of States and Political Subdivisions	1.6		1.6		1.0		1.1		—		—		—		—		2.6		2.7
Government Sponsored Agency	0.5		0.6		1.5		1.6		0.9		1.0		0.5		0.5		3.4		3.7
Non-U.S. Government	7,291.5		7,293.2		260.3		266.5		—		—		—		—		7,551.8		7,559.7
Corporate Debt	125.0		125.2		405.3		410.6		—		—		—		—		530.3		535.8
Covered Bonds	1,228.1		1,233.1		2,133.6		2,153.0		—		—		—		—		3,361.7		3,386.1
Certificates of Deposit	726.3		726.3		—		—		—		—		—		—		726.3		726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	832.7		837.1		2,325.2		2,362.7		232.6		233.2		—		—		3,390.5		3,433.0
Other Asset-Backed	190.1		190.1		435.4		435.8		20.3		20.4		—		—		645.8		646.3
Other	21.3		20.8		251.4		228.1		58.9		49.4		111.0		55.6		442.6		353.9
Total	$	10,516.1	$	10,527.0	$	5,813.7	$	5,859.4	$	312.7	$	304.0	$	111.5	$	56.1	$	16,754.0	$	16,746.5

Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments

Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value

The following table provides information regarding debt securities available for sale with no credit losses reported that had been in a continuous unrealized loss position for less than twelve months and for twelve months or longer as of September 30, 2020 and December 31, 2019.

TABLE 43: DEBT SECURITIES AVAILABLE FOR SALE IN UNREALIZED LOSS POSITION WITH NO CREDIT LOSSES REPORTED

AS OF SEPTEMBER 30, 2020	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
Obligations of States and Political Subdivisions	$	230.4	$	1.0	$	—	$	—	$	230.4	$	1.0
Government Sponsored Agency	2,578.6		6.8		2,862.3		14.4		5,440.9		21.2
Non-U.S. Government	26.5		0.1		—		—		26.5		0.1
Corporate Debt	69.1		1.0		76.1		1.2		145.2		2.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	146.3		0.2		158.7		0.1		305.0		0.3
Other Asset-Backed	631.2		1.0		846.3		8.5		1,477.5		9.5
Commercial Mortgage-Backed	76.3		0.7		—		—		76.3		0.7
Total	$	3,758.4	$	10.8	$	3,943.4	$	24.2	$	7,701.8	$	35.0

AS OF DECEMBER 31, 2019	LESS THAN 12 MONTHS				12 MONTHS OR LONGER				TOTAL
(In Millions)	FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES		FAIR VALUE		UNREALIZED LOSSES
U.S. Government	$	252.2	$	2.8	$	899.7	$	2.3	$	1,151.9	$	5.1
Obligations of States and Political Subdivisions	902.4		13.3		—		—		902.4		13.3
Government Sponsored Agency	5,405.0		35.6		7,818.4		42.5		13,223.4		78.1
Corporate Debt	279.3		1.1		492.7		2.9		772.0		4.0
Covered Bonds	138.7		0.7		25.0		0.1		163.7		0.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	217.5		1.0		155.2		0.1		372.7		1.1
Other Asset-Backed	592.4		1.8		1,164.9		3.5		1,757.3		5.3
Commercial Mortgage-Backed	62.8		0.7		59.3		0.2		122.1		0.9
Total	$	7,850.3	$	57.0	$	10,615.2	$	51.6	$	18,465.5	$	108.6

Debt Securities, Held-to-maturity

The following tables provide the amortized cost and fair values at September 30, 2020 and December 31, 2019, and remaining maturities of debt securities held to maturity at September 30, 2020.

TABLE 44: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF DEBT SECURITIES HELD TO MATURITY

	SEPTEMBER 30, 2020
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S Government	$	99.0	$	—	$	—	$	99.0
Obligations of States and Political Subdivisions	2.6		0.1		—		2.7
Government Sponsored Agency	3.4		0.3		—		3.7
Non-U.S. Government	7,551.8		8.1		0.2		7,559.7
Corporate Debt	530.3		5.5		—		535.8
Covered Bonds	3,361.7		25.4		1.0		3,386.1
Certificates of Deposit	726.3		—		—		726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	3,390.5		42.8		0.3		3,433.0
Other Asset-Backed	645.8		0.7		0.2		646.3
Other	442.6		—		88.7		353.9
Total	$	16,754.0	$	82.9	$	90.4	$	16,746.5

	DECEMBER 31, 2019
(In Millions)	AMORTIZED COST		GROSS UNREALIZED GAINS		GROSS UNREALIZED LOSSES		FAIR VALUE
U.S. Government	$	138.8	$	—	$	—	$	138.8
Obligations of States and Political Subdivisions	10.1		0.2		—		10.3
Government Sponsored Agency	4.1		0.2		—		4.3
Non-U.S. Government	4,076.0		5.3		2.5		4,078.8
Corporate Debt	405.1		1.4		0.3		406.2
Covered Bonds	3,006.7		16.1		2.4		3,020.4
Certificates of Deposit	262.9		—		—		262.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	3,285.4		21.7		2.1		3,305.0
Other Asset-Backed	804.3		0.7		0.3		804.7
Other	291.1		0.1		73.3		217.9
Total	$	12,284.5	$	45.7	$	80.9	$	12,249.3

Debt Securities, Held-to-maturity, Credit Quality Indicator

The following table provides the amortized cost of debt securities held to maturity by credit rating.

TABLE 46: AMORTIZED COST OF DEBT SECURITIES HELD TO MATURITY BY CREDIT RATING

	AS OF SEPTEMBER 30, 2020
(In Millions)	AAA		AA		A		BBB		NOT RATED		TOTAL
U.S. Government	$	99.0	$	—	$	—	$	—	$	—	$	99.0
Obligations of States and Political Subdivisions	—		0.6		0.7		1.3		—		2.6
Government Sponsored Agency	3.4		—		—		—		—		3.4
Non-U.S. Government	335.6		1,269.7		5,899.8		46.7		—		7,551.8
Corporate Debt	3.6		254.7		272.0		—		—		530.3
Covered Bonds	3,361.7		—		—		—		—		3,361.7
Certificates of Deposit	—		—		—		—		726.3		726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds	2,423.6		966.9		—		—		—		3,390.5
Other Asset-Backed	645.8		—		—		—		—		645.8
Other	—		—		—		—		442.6		442.6
Total	$	6,872.7	$	2,491.9	$	6,172.5	$	48.0	$	1,168.9	$	16,754.0

Schedule of Realized Gain (Loss)

TABLE 47: INVESTMENT SECURITY GAINS AND LOSSES

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Gross Realized Debt Securities Gains	$	—	$	0.1	$	3.4	$	1.6
Gross Realized Debt Securities Losses	—		(0.4)		(3.3)		(2.2)
Changes in Other-Than-Temporary Impairment Losses(1)	—		(0.1)		—		(0.3)
Net Investment Security (Losses) Gains	$	—	$	(0.4)	$	0.1	$	(0.9)

(1) Other-than-temporary impairment losses relate to certain Community Reinvestment Act (CRA) eligible held to maturity debt securities.

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Securities Sold Under Agreements to Repurchase (Tables)

9 Months Ended

Sep. 30, 2020

Banking and Thrift, Other Disclosures [Abstract]

Repurchase Agreements Accounted for as Secured Borrowings

The following table provides information regarding repurchase agreements that are accounted for as secured borrowings as of September 30, 2020 and December 31, 2019.

TABLE 48: REPURCHASE AGREEMENTS ACCOUNTED FOR AS SECURED BORROWINGS

	REMAINING CONTRACTUAL MATURITY OF THE AGREEMENTS
	OVERNIGHT AND CONTINUOUS
($ In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
U.S. Treasury and Agency Securities	$	269.8	$	489.7
Total Borrowings	269.8		489.7
Gross Amount of Recognized Liabilities for Repurchase Agreements in Note 21	269.8		489.7
Amounts related to agreements not included in Note 21	—		—

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Loans and Leases (Tables)

9 Months Ended

Sep. 30, 2020

Receivables [Abstract]

Loans and Leases

Amounts outstanding for loans and leases, by segment and class, are shown in the following table. During the first quarter of 2020, the Corporation implemented a change in the classification of certain loans and leases to specific segments to enhance the consistency of its reporting across various regulatory regimes. As a result, the loan and lease balances as of December 31, 2019 below have been adjusted to conform to the presentation for periods ended after such date. The adjustments generally reflect reclassification of loans from the commercial real estate class to commercial and institutional, residential real estate, and private client classes. There was no impact on total loans and leases previously reported.

TABLE 49: LOANS AND LEASES

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Commercial
Commercial and Institutional	$	9,524.0	$	9,091.1
Commercial Real Estate	3,373.6		3,104.3
Non-U.S.	1,441.0		1,576.3
Lease Financing, net	30.1		65.6
Other	213.0		164.0
Total Commercial	14,581.7		14,001.3
Personal
Private Client	11,893.0		11,071.4
Residential Real Estate	5,928.3		6,095.0
Non-U.S.	338.7		174.8
Other	24.6		67.1
Total Personal	18,184.6		17,408.3
Total Loans and Leases	$	32,766.3	$	31,409.6

Borrower Ratings

Loan and lease segment and class balances as of September 30, 2020 are provided in the following table, segregated by borrower ratings into “1 to 3,” “4 to 5” and “6 to 9” (watch list and nonaccrual status) categories by year of origination at amortized cost basis. Loans that are held for investment are reported at the principal amount outstanding, net of unearned income.

TABLE 50: CREDIT QUALITY INDICATOR AT AMORTIZED COST BASIS BY ORIGINATION YEAR

September 30, 2020	TERM LOANS AND LEASES												REVOLVING LOANS		REVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)	2020		2019		2018		2017		2016		PRIOR						TOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category	$	245.2	$	571.6	$	208.2	$	142.8	$	457.8	$	465.2	$	3,286.6	$	2.0	$	5,379.4
4 to 5 Category	614.0		579.5		379.7		428.4		143.0		180.4		1,346.4		50.1		3,721.5
6 to 9 Category	36.7		134.7		39.0		29.0		38.5		20.5		124.7		—		423.1
Total Commercial and Institutional	895.9		1,285.8		626.9		600.2		639.3		666.1		4,757.7		52.1		9,524.0
Commercial Real Estate
Risk Rating:
1 to 3 Category	359.5		205.7		71.8		40.5		24.9		113.4		126.5		8.9		951.2
4 to 5 Category	453.4		758.0		294.1		110.6		178.5		383.9		72.4		13.7		2,264.6
6 to 9 Category	7.5		55.2		32.5		32.0		1.6		29.0		—		—		157.8
Total Commercial Real Estate	820.4		1,018.9		398.4		183.1		205.0		526.3		198.9		22.6		3,373.6
Non-U.S.
Risk Rating:
1 to 3 Category	790.8		15.9		10.0		10.7		—		—		32.2		—		859.6
4 to 5 Category	259.5		0.6		2.0		—		—		78.6		37.2		1.8		379.7
6 to 9 Category	0.7		23.1		—		—		—		—		177.9		—		201.7
Total Non-U.S.	1,051.0		39.6		12.0		10.7		—		78.6		247.3		1.8		1,441.0
Lease Financing, net
Risk Rating:
1 to 3 Category	—		—		—		—		—		18.5		—		—		18.5
4 to 5 Category	—		—		—		—		—		11.6		—		—		11.6
6 to 9 Category	—		—		—		—		—		—		—		—		—
Total Lease Financing, net	—		—		—		—		—		30.1		—		—		30.1
Other
Risk Rating:
1 to 3 Category	97.7		—		—		—		—		—		—		—		97.7
4 to 5 Category	115.3		—		—		—		—		—		—		—		115.3
6 to 9 Category	—		—		—		—		—		—		—		—		—
Total Other	213.0		—		—		—		—		—		—		—		213.0
Total Commercial	2,980.3		2,344.3		1,037.3		794.0		844.3		1,301.1		5,203.9		76.5		14,581.7
Personal
Private Client
Risk Rating:
1 to 3 Category	466.3		394.3		56.8		67.6		34.2		150.2		5,087.1		126.1		6,382.6
4 to 5 Category	468.4		493.6		129.6		60.0		78.1		80.9		3,952.3		145.7		5,408.6
6 to 9 Category	5.6		0.5		22.4		3.2		—		—		62.1		8.0		101.8
Total Private Client	940.3		888.4		208.8		130.8		112.3		231.1		9,101.5		279.8		11,893.0
Residential Real Estate
Risk Rating:
1 to 3 Category	1,322.9		396.2		60.9		108.9		254.2		738.0		188.2		1.5		3,070.8
4 to 5 Category	619.8		342.5		126.6		184.2		233.8		904.6		270.2		7.4		2,689.1
6 to 9 Category	13.1		9.4		1.7		0.5		2.7		108.7		32.3		—		168.4
Total Residential Real Estate	1,955.8		748.1		189.2		293.6		490.7		1,751.3		490.7		8.9		5,928.3
Non-U.S.
Risk Rating:
1 to 3 Category	8.6		21.5		—		—		—		1.8		28.2		—		60.1
4 to 5 Category	12.8		22.7		11.9		0.5		0.5		8.2		216.7		5.1		278.4
6 to 9 Category	—		—		—		—		—		0.2		—		—		0.2
Total Non-U.S.	21.4		44.2		11.9		0.5		0.5		10.2		244.9		5.1		338.7
Other
Risk Rating:
1 to 3 Category	5.5		—		—		—		—		—		—		—		5.5
4 to 5 Category	19.1		—		—		—		—		—		—		—		19.1
6 to 9 Category	—		—		—		—		—		—		—		—		—
Total Other	24.6		—		—		—		—		—		—		—		24.6
Total Personal	2,942.1		1,680.7		409.9		424.9		603.5		1,992.6		9,837.1		293.8		18,184.6
Total Loans and Leases	$	5,922.4	$	4,025.0	$	1,447.2	$	1,218.9	$	1,447.8	$	3,293.7	$	15,041.0	$	370.3	$	32,766.3

Delinquency Status

The following table provides balances and delinquency status of accrual and nonaccrual loans and leases by segment and class, as well as the other real estate owned and nonaccrual asset balances, as of September 30, 2020 and December 31, 2019.

TABLE 51: DELINQUENCY STATUS

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS AND LEASES
September 30, 2020
Commercial
Commercial and Institutional	$	9,470.9	$	21.9	$	0.2	$	0.8	$	9,493.8	$	30.2	$	9,524.0	$	11.5
Commercial Real Estate	3,361.0		0.6		8.1		—		3,369.7		3.9		3,373.6		3.9
Non-U.S.	1,441.0		—		—		—		1,441.0		—		1,441.0		—
Lease Financing, net	30.1		—		—		—		30.1		—		30.1		—
Other	213.0		—		—		—		213.0		—		213.0		—
Total Commercial	14,516.0		22.5		8.3		0.8		14,547.6		34.1		14,581.7		15.4
Personal
Private Client	11,832.8		39.4		13.3		7.5		11,893.0		—		11,893.0		—
Residential Real Estate	5,859.9		2.9		1.3		0.3		5,864.4		63.9		5,928.3		55.5
Non-U.S.	338.7		—		—		—		338.7		—		338.7		—
Other	24.6		—		—		—		24.6		—		24.6		—
Total Personal	18,056.0		42.3		14.6		7.8		18,120.7		63.9		18,184.6		55.5
Total Loans and Leases	$	32,572.0	$	64.8	$	22.9	$	8.6	$	32,668.3	$	98.0	$	32,766.3	$	70.9
	Other Real Estate Owned										$	0.9
	Total Nonaccrual Assets										$	98.9

	ACCRUAL														NONACCRUAL WITH NO ALLOWANCE
(In Millions)	CURRENT		30 – 59 DAYS PAST DUE		60 – 89 DAYS PAST DUE		90 DAYS OR MORE PAST DUE		TOTAL ACCRUAL		NONACCRUAL		TOTAL LOANS AND LEASES
December 31, 2019
Commercial
Commercial and Institutional	$	9,068.3	$	4.1	$	9.9	$	1.2	$	9,083.5	$	7.6	$	9,091.1	$	0.8
Commercial Real Estate	3,089.6		2.3		4.1		4.7		3,100.7		3.6		3,104.3		2.4
Non-U.S.	1,576.3		—		—		—		1,576.3		—		1,576.3		—
Lease Financing, net	65.6		—		—		—		65.6		—		65.6		—
Other	164.0		—		—		—		164.0		—		164.0		—
Total Commercial	13,963.8		6.4		14.0		5.9		13,990.1		11.2		14,001.3		3.2
Personal
Private Client	11,027.9		33.2		9.5		0.3		11,070.9		0.5		11,071.4		0.5
Residential Real Estate	5,997.7		19.8		4.9		1.2		6,023.6		71.4		6,095.0		66.4
Non-U.S	174.1		0.2		—		—		174.3		0.5		174.8		0.5
Other	67.1		—		—		—		67.1		—		67.1		—
Total Personal	17,266.8		53.2		14.4		1.5		17,335.9		72.4		17,408.3		67.4
Total Loans and Leases	$	31,230.6	$	59.6	$	28.4	$	7.4	$	31,326.0	$	83.6	$	31,409.6	$	70.6
	Other Real Estate Owned										$	3.2
	Total Nonaccrual Assets										$	86.8

Modified Troubled Debt Restructurings

The following table provides, by segment and class, the number of TDR modifications of loans and leases during the three- and nine- month periods ended September 30, 2020 and 2019, and the recorded investments and unpaid principal balances as of September 30, 2020 and 2019.

TABLE 52: TROUBLED DEBT RESTRUCTURINGS

	THREE MONTHS ENDED SEPTEMBER 30, 2020					NINE MONTHS ENDED SEPTEMBER 30, 2020
($ In Millions)	NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE		NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE
Commercial
Commercial and Institutional	1	$	1.0	$	1.0	3	$	25.3	$	25.5
Total Commercial	1	1.0		1.0		3	25.3		25.5
Personal
Residential Real Estate	10	17.4		17.5		16	18.3		18.7
Total Personal	10	17.4		17.5		16	18.3		18.7
Total Loans and Leases	11	$	18.4	$	18.5	19	$	43.6	$	44.2

Note: Period-end balances reflect all paydowns and charge-offs during the period.

	THREE MONTHS ENDED SEPTEMBER 30, 2019					NINE MONTHS ENDED SEPTEMBER 30, 2019
($ In Millions)	NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE		NUMBER OF LOANS AND LEASES	RECORDED INVESTMENT		UNPAID PRINCIPAL BALANCE
Commercial
Commercial and Institutional	—	$	—	$	—	1	$	7.6	$	8.8
Commercial Real Estate	—	—		—		2	—		—
Total Commercial	—	—		—		3	7.6		8.8
Personal
Residential Real Estate	5	3.1		3.1		31	20.6		20.8
Total Personal	5	3.1		3.1		31	20.6		20.8
Total Loans and Leases	5	$	3.1	$	3.1	34	$	28.2	$	29.6

Note: Period-end balances reflect all paydowns and charge-offs during the period.

Schedule Of Non-Troubled Debt Restructuring Modifications

The following tables provide, by segment and class, the number of total COVID-19-related loan modifications including the loan volume and deferred principal and interest balances as of September 30, 2020, for which Northern Trust applied an exemption from TDR classification that are in active deferral (loans currently in the deferral period) or completed deferral (loans that returned to their regular payment schedule).

TABLE 53: COVID-19 LOAN MODIFICATIONS NOT CONSIDERED TDRS IN ACTIVE DEFERRAL STATUS

	SEPTEMBER 30, 2020
($ In Millions)	NUMBER OF COVID-19 RELATED MODIFICATIONS	LOAN VOLUME		DEFERRED PRINCIPAL AMOUNT		DEFERRED INTEREST AMOUNT
Commercial
Commercial and Institutional	13	$	73.2	$	0.3	$	0.5
Commercial Real Estate	2	7.3		—		—
Total Commercial	15	$	80.5	$	0.3	$	0.5
Personal
Private Client	2	$	5.2	$	—	$	0.1
Residential Real Estate	53	19.3		0.3		0.3
Total Personal	55	$	24.5	$	0.3	$	0.4
Total Loans	70	$	105.0	$	0.6	$	0.9

TABLE 54: COVID-19 LOAN MODIFICATIONS NOT CONSIDERED TDRS THAT HAVE COMPLETED DEFERRAL

	SEPTEMBER 30, 2020
($ In Millions)	NUMBER OF COVID-19 RELATED MODIFICATIONS	LOAN VOLUME		DEFERRED PRINCIPAL AMOUNT		DEFERRED INTEREST AMOUNT
Commercial
Commercial and Institutional	101	$	199.7	$	5.0	$	1.5
Commercial Real Estate	104	472.2		2.9		3.3
Total Commercial	205	$	671.9	$	7.9	$	4.8
Personal
Private Client	34	$	177.6	$	2.3	$	1.1
Residential Real Estate	346	184.8		0.5		2.0
Total Personal	380	$	362.4	$	2.8	$	3.1
Total Loans	585	$	1,034.3	$	10.7	$	7.9

Not included in the table above are 31 loans with $34.3 million in loan balances as of June 30, 2020 that had been granted payment deferrals but have since paid off.

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Allowance for Credit Losses (Tables)

9 Months Ended

Sep. 30, 2020

Receivables [Abstract]

Allowance for Credit Loss

	THREE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		DEBT SECURITIES HELD TO MATURITY		OTHER FINANCIAL ASSETS		TOTAL
Balance at Beginning of Period	$	210.2	$	49.0	$	6.5	$	1.3	$	267.0
Charge-Offs	(0.8)		—		—		—		(0.8)
Recoveries	1.2		—		—		—		1.2
Net Recoveries (Charge-Offs)	0.4		—		—		—		0.4
Provision for Credit Losses	4.8		(4.1)		0.4		(0.6)		0.5
Balance at End of Period	$	215.4	$	44.9	$	6.9	$	0.7	$	267.9

	NINE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		DEBT SECURITIES HELD TO MATURITY		OTHER FINANCIAL ASSETS		TOTAL
Balance at End of Prior Period	$	104.5	$	19.9	$	—	$	—	$	124.4
Cumulative Effect Adjustment	(2.2)		8.9		6.6		0.4		13.7
Balance at Beginning of Period	102.3		28.8		6.6		0.4		138.1
Charge-Offs	(3.0)		—		—		—		(3.0)
Recoveries	5.3		—		—		—		5.3
Net Recoveries (Charge-Offs)	2.3		—		—		—		2.3
Provision for Credit Losses	110.8		16.1		0.3		0.3		127.5
Balance at End of Period	$	215.4	$	44.9	$	6.9	$	0.7	$	267.9

	THREE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		TOTAL
Balance at Beginning of Period	$	110.8	$	23.3	$	134.1
Charge-Offs	(1.1)		—		(1.1)
Recoveries	1.7		—		1.7
Net Recoveries (Charge-Offs)	0.6		—		0.6
Provision for Credit Losses	(5.7)		(1.3)		(7.0)
Balance at End of Period	$	105.7	$	22.0	$	127.7

	NINE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	LOANS AND LEASES		UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT		TOTAL
Balance at Beginning of Period	$	112.6	$	25.6	$	138.2
Charge-Offs	(2.7)		—		(2.7)
Recoveries	5.7		—		5.7
Net Recoveries (Charge-Offs)	3.0		—		3.0
Provision for Credit Losses	(9.9)		(3.6)		(13.5)
Balance at End of Period	$	105.7	$	22.0	$	127.7

The following table provides information regarding changes in the total allowance for credit losses, including undrawn loan commitments and standby letters of credit, by segment during the three and nine months ended September 30, 2020 and 2019.

TABLE 58: CHANGES IN THE ALLOWANCE FOR CREDIT LOSSES RELATED TO LOANS AND LEASES

	THREE MONTHS ENDED SEPTEMBER 30, 2020
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	162.8	$	47.4	$	210.2	$	46.1	$	2.9	$	49.0
Charge-Offs	—		(0.8)		(0.8)		—		—		—
Recoveries	0.2		1.0		1.2		—		—		—
Net Recoveries (Charge-Offs)	0.2		0.2		0.4		—		—		—
Provision for Credit Losses	(15.4)		20.2		4.8		(6.0)		1.9		(4.1)
Balance at End of Period	$	147.6	$	67.8	$	215.4	$	40.1	$	4.8	$	44.9

	NINE MONTHS ENDED SEPTEMBER 30, 2020
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at End of Prior Period	$	58.1	$	46.4	$	104.5	$	15.8	$	4.1	$	19.9
Cumulative Effect Adjustment	(5.9)		3.7		(2.2)		11.9		(3.0)		8.9
Balance at Beginning of Period	52.2		50.1		102.3		27.7		1.1		28.8
Charge-Offs	(0.1)		(2.9)		(3.0)		—		—		—
Recoveries	2.2		3.1		5.3		—		—		—
Net Recoveries (Charge-Offs)	2.1		0.2		2.3		—		—		—
Provision for Credit Losses	93.3		17.5		110.8		12.4		3.7		16.1
Balance at End of Period	$	147.6	$	67.8	$	215.4	$	40.1	$	4.8	$	44.9

	THREE MONTHS ENDED SEPTEMBER 30, 2019
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	59.9	$	50.9	$	110.8	$	18.5	$	4.8	$	23.3
Charge-Offs	—		(1.1)		(1.1)		—		—		—
Recoveries	—		1.7		1.7		—		—		—
Net Recoveries (Charge-Offs)	—		0.6		0.6		—		—		—
Provision for Credit Losses	(1.3)		(4.4)		(5.7)		(0.7)		(0.6)		(1.3)
Balance at End of Period	$	58.6	$	47.1	$	105.7	$	17.8	$	4.2	$	22.0

	NINE MONTHS ENDED SEPTEMBER 30, 2019
	LOANS AND LEASES						UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Balance at Beginning of Period	$	57.6	$	55.0	$	112.6	$	21.1	$	4.5	$	25.6
Charge-Offs	(0.1)		(2.6)		(2.7)		—		—		—
Recoveries	0.7		5.0		5.7		—		—		—
Net Recoveries (Charge-Offs)	0.6		2.4		3.0		—		—		—
Provision for Credit Losses	0.4		(10.3)		(9.9)		(3.3)		(0.3)		(3.6)
Balance at End of Period	$	58.6	$	47.1	$	105.7	$	17.8	$	4.2	$	22.0

The following table provides information regarding the recorded investments in loans and leases and the allowance for credit losses for loans and leases and undrawn loan commitments and standby letters of credit by segment as of September 30, 2020 and December 31, 2019.

TABLE 59: RECORDED INVESTMENTS IN LOANS AND LEASES

	SEPTEMBER 30, 2020						DECEMBER 31, 2019
(In Millions)	COMMERCIAL		PERSONAL		TOTAL		COMMERCIAL		PERSONAL		TOTAL
Loans and Leases
Evaluated on an Individual Level	$	34.1	$	63.9	$	98.0	$	10.4	$	81.8	$	92.2
Evaluated on a Collective Level	14,547.6		18,120.7		32,668.3		13,990.9		17,326.5		31,317.4
Total Loans and Leases	14,581.7		18,184.6		32,766.3		14,001.3		17,408.3		31,409.6
Allowance for Credit Losses on Credit Exposures
Evaluated on an Individual Level	5.6		0.4		6.0		3.4		1.6		5.0
Evaluated on a Collective Level	142.0		67.4		209.4		54.7		44.8		99.5
Allowance Assigned to Loans and Leases	147.6		67.8		215.4		58.1		46.4		104.5
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Level	2.2		—		2.2		1.9		—		1.9
Evaluated on a Collective Level	37.9		4.8		42.7		13.9		4.1		18.0
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	40.1		4.8		44.9		15.8		4.1		19.9
Total Allowance Assigned to Loans and Leases and Undrawn Loan Commitments and Standby Letters of Credit	$	187.7	$	72.6	$	260.3	$	73.9	$	50.5	$	124.4

Schedule of Accrued Liabilities

The following table provides the amount of accrued interest excluded from the amortized cost basis of the following portfolios.

TABLE 56: ACCRUED INTEREST

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Loans and Leases	$	54.2	$	84.5
Debt Securities
Held to Maturity	$	71.7	$	82.3
Available for Sale	101.0		119.0
Other Financial Assets	$	1.7	$	14.7

The following table provides amounts of accrued interest reversed through interest income by segment for the loan and lease portfolio.

TABLE 57: ACCRUED INTEREST REVERSED THROUGH INCOME

	THREE MONTHS ENDED SEPTEMBER 30,		NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2020
Commercial	$	0.5	$	1.5
Personal	0.6		$	2.0
Total Loans and Leases	$	1.1	$	3.5

Debt Securities, Held-to-maturity, Allowance for Credit Loss

	THREE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPERNATIONAL, AND NON-U.S. AGENCY BONDS		CERTIFICATE OF DEPOSITS		COVERED BONDS		OTHER		TOTAL
Balance at Beginning of Period	$	0.5	$	0.4	$	0.7	$	—	$	—	$	4.9	$	6.5
Provision for Credit Losses	0.2		—		(0.1)		0.2		0.1		—		0.4
Balance at End of Period	$	0.7	$	0.4	$	0.6	$	0.2	$	0.1	$	4.9	$	6.9

	NINE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	CORPORATE DEBT		NON-U.S. GOVERNMENT		SUB-SOVEREIGN, SUPERNATIONAL, AND NON-U.S. AGENCY BONDS		CERTIFICATE OF DEPOSITS		COVERED BONDS		OTHER		TOTAL
Balance at End of Prior Period	$	—	$	—	$	—	$	—	$	—	$	—	$	—
Cumulative Effect Adjustment	0.8		0.3		0.9		—		—		4.6		6.6
Balance at Beginning of Period	0.8		0.3		0.9		—		—		4.6		6.6
Provision for Credit Losses	(0.1)		0.1		(0.3)		0.2		0.1		0.3		0.3
Balance at End of Period	$	0.7	$	0.4	$	0.6	$	0.2	$	0.1	$	4.9	$	6.9

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Pledged Assets (Tables)

9 Months Ended

Sep. 30, 2020

Transfers and Servicing [Abstract]

Schedule of Financial Instruments Owned and Pledged as Collateral

The following table presents Northern Trust's pledged assets.

TABLE 61: TYPE OF PLEDGED ASSETS

(In Billions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Securities
Obligations of States and Political Subdivisions	$	1.6	$	1.0
Government Sponsored Agency and Other Securities	30.0		33.4
Loans	11.8		7.7
Total Pledged Assets	$	43.4	$	42.1

The following table presents the available for sale debt securities pledged as collateral that are included in pledged assets.

TABLE 62: FAIR VALUE OF AVAILABLE FOR SALE DEBT SECURITIES INCLUDED IN PLEDGED ASSETS

	SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE				DERIVATIVE CONTRACTS
(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019		SEPTEMBER 30, 2020		DECEMBER 31, 2019
Debt Securities
Available for Sale	$	268.6	$	487.1	$	30.0	$	14.4

Schedule of Customer Securities for which Entity has Right to Sell or Repledge

The following table presents the fair value of securities accepted as collateral. There was no repledged or sold collateral at September 30, 2020 or December 31, 2019.

TABLE 63: ACCEPTED COLLATERAL

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Collateral that may be repledged or sold
Reverse repurchase agreements	$	1,533.4	$	707.8
Derivative contracts	30.6		16.8

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Goodwill and Other Intangibles (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill by Reporting Segment

Changes by reporting segment in the carrying amount of goodwill for the nine months ended September 30, 2020, including the effect of foreign exchange rates on non-U.S.-dollar denominated balances, were as follows:

TABLE 64: GOODWILL BY REPORTING SEGMENT

(In Millions)	CORPORATE & INSTITUTIONAL SERVICES		WEALTH MANAGEMENT		TOTAL
Balance at December 31, 2019	$	625.7	$	71.1	$	696.8
Foreign Exchange Rates	1.2		—		1.2
Balance at September 30, 2020	$	626.9	$	71.1	$	698.0

Other Intangible Assets

The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of September 30, 2020 and December 31, 2019 were as follows:

TABLE 65: OTHER INTANGIBLE ASSETS

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Gross Carrying Amount	$	214.3	$	207.2
Less: Accumulated Amortization	101.7		86.6
Net Book Value	$	112.6	$	120.6

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Reporting Segments (Tables)

9 Months Ended

Sep. 30, 2020

Segment Reporting [Abstract]

Results of Reporting Segments

The following table reflects the earnings contributions and average assets of Northern Trust’s reporting segments for the three- and nine- month periods ended September 30, 2020 and 2019.

TABLE 66: RESULTS OF REPORTING SEGMENTS

($ In Millions)	CORPORATE & INSTITUTIONAL SERVICES						WEALTH MANAGEMENT						TREASURY AND OTHER						TOTAL CONSOLIDATED
THREE MONTHS ENDED SEPTEMBER 30,	2020			2019			2020			2019			2020			2019			2020			2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$	584.9		$	559.9		$	418.9		$	415.6		$	—		$	—		$	1,003.8		$	975.5
Foreign Exchange Trading Income	58.4			55.5			3.2			4.2			—			—			61.6			59.7
Other Noninterest Income	56.7			53.6			39.7			38.1			(5.3)			(6.7)			91.1			85.0
Total Noninterest Income	700.0			669.0			461.8			457.9			(5.3)			(6.7)			1,156.5			1,120.2
Net Interest Income(1)	139.9			229.9			196.6			195.4			—			—			336.5			425.3
Revenue(1)	839.9			898.9			658.4			653.3			(5.3)			(6.7)			1,493.0			1,545.5
Provision for Credit Losses	(19.2)			4.8			19.7			(11.8)			—			—			0.5			(7.0)
Noninterest Expense	707.3			649.2			386.3			385.9			1.1			1.2			1,094.7			1,036.3
Income before Income Taxes(1)	151.8			244.9			252.4			279.2			(6.4)			(7.9)			397.8			516.2
Provision for Income Taxes(1)	38.7			59.9			66.2			73.6			(1.6)			(1.9)			103.3			131.6
Net Income	$	113.1		$	185.0		$	186.2		$	205.6		$	(4.8)		$	(6.0)		$	294.5		$	384.6
Percentage of Consolidated Net Income	39		%	48		%	63		%	54		%	(2)		%	(2)		%	100		%	100		%
Average Assets	$	108,823.0		$	85,982.2		$	32,102.4		$	30,369.9		$	—		$	—		$	140,925.4		$	116,352.1

⁽¹⁾    Non-GAAP financial measures stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $7.9 million for 2020 and $7.6 million for 2019.

($ In Millions)	CORPORATE & INSTITUTIONAL SERVICES						WEALTH MANAGEMENT						TREASURY AND OTHER						TOTAL CONSOLIDATED
NINE MONTHS ENDED SEPTEMBER 30,	2020			2019			2020			2019			2020			2019			2020			2019
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,725.5		$	1,644.5		$	1,243.4		$	1,215.4		$	—		$	—		$	2,968.9		$	2,859.9
Foreign Exchange Trading Income	211.8			172.5			10.0			13.9			—			—			221.8			186.4
Other Noninterest Income	167.5			141.8			122.9			95.1			(11.0)			(14.9)			279.4			222.0
Total Noninterest Income	2,104.8			1,958.8			1,376.3			1,324.4			(11.0)			(14.9)			3,470.1			3,268.3
Net Interest Income(1)	516.6			694.3			615.9			585.9			—			—			1,132.5			1,280.2
Revenue(1)	2,621.4			2,653.1			1,992.2			1,910.3			(11.0)			(14.9)			4,602.6			4,548.5
Provision for Credit Losses	35.3			1.3			92.2			(14.8)			—			—			127.5			(13.5)
Noninterest Expense	2,022.2			1,930.5			1,152.7			1,137.9			22.3			2.8			3,197.2			3,071.2
Income before Income Taxes(1)	563.9			721.3			747.3			787.2			(33.3)			(17.7)			1,277.9			1,490.8
Provision for Income Taxes(1)	129.9			171.8			187.9			202.3			(8.3)			(4.4)			309.5			369.7
Net Income	$	434.0		$	549.5		$	559.4		$	584.9		$	(25.0)		$	(13.3)		$	968.4		$	1,121.1
Percentage of Consolidated Net Income	45		%	49		%	58		%	52		%	(3)		%	(1)		%	100		%	100		%
Average Assets	$	102,902.3		$	87,664.1		$	31,742.9		$	29,700.6		$	—		$	—		$	134,645.2		$	117,364.7

⁽¹⁾    Non-GAAP financial measures stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $23.7 million for 2020 and $23.1 million for 2019.

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Accumulated Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income (Loss)

The following tables summarize the components of accumulated other comprehensive income (loss) (AOCI) at September 30, 2020 and 2019, and changes during the three and nine months then ended.

TABLE 67: SUMMARY OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

	THREE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at June 30, 2020	$	631.8	$	0.3	$	145.5	$	(407.2)	$	370.4
Net Change	33.5		1.3		1.8		17.5		54.1
Balance at September 30, 2020	$	665.3	$	1.6	$	147.3	$	(389.7)	$	424.5

⁽¹⁾ Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2020.

	NINE MONTHS ENDED SEPTEMBER 30, 2020
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at December 31, 2019	$	114.0	$	(3.7)	$	117.8	$	(422.8)	$	(194.7)
Net Change	551.3		5.3		29.5		33.1		619.2
Balance at September 30, 2020	$	665.3	$	1.6	$	147.3	$	(389.7)	$	424.5

⁽¹⁾ Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2020.

	THREE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at June 30, 2019	$	133.1	$	4.5	$	96.8	$	(394.2)	$	(159.8)
Net Change	57.0		(2.4)		9.9		4.3		68.8
Balance at September 30, 2019	$	190.1	$	2.1	$	106.7	$	(389.9)	$	(91.0)

⁽¹⁾    Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2019.

	NINE MONTHS ENDED SEPTEMBER 30, 2019
(In Millions)	NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE(1)		NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES		NET FOREIGN CURRENCY ADJUSTMENT		NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS		TOTAL
Balance at December 31, 2018	$	(114.9)	$	4.0	$	67.9	$	(410.7)	$	(453.7)
Net Change	305.0		(1.9)		38.8		20.8		362.7
Balance at September 30, 2019	$	190.1	$	2.1	$	106.7	$	(389.9)	$	(91.0)

⁽¹⁾    Includes net unrealized gains on debt securities transferred from available for sale to held to maturity during the period ended September 30, 2019.

Details of Changes in Accumulated Other Comprehensive Income (Loss)

TABLE 68: DETAILS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

	THREE MONTHS ENDED SEPTEMBER 30,
	2020						2019
(In Millions)	BEFORE TAX		TAX EFFECT		AFTER TAX		BEFORE TAX		TAX EFFECT		AFTER TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale
Unrealized Gains (Losses) on Debt Securities Available for Sale	$	45.3	$	(11.8)	$	33.5	$	76.1	$	(19.4)	$	56.7
Reclassification Adjustment for (Gains) Losses Included in Net Income(1)	—		—		—		0.3		—		0.3
Net Change	$	45.3	$	(11.8)	$	33.5	$	76.4	$	(19.4)	$	57.0
Unrealized Gains (Losses) on Cash Flow Hedges
Foreign Exchange Contracts	$	6.6	$	(1.6)	$	5.0	$	0.7	$	(0.2)	$	0.5
Interest Rate Contracts	(0.2)		—		(0.2)		0.1		—		0.1
Reclassification Adjustment for (Gains) Losses Included in Net Income(2)	(4.7)		1.2		(3.5)		(4.0)		1.0		(3.0)
Net Change	$	1.7	$	(0.4)	$	1.3	$	(3.2)	$	0.8	$	(2.4)
Foreign Currency Adjustments
Foreign Currency Translation Adjustments	$	92.1	$	(3.1)	$	89.0	$	(71.9)	$	2.0	$	(69.9)
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)	1.2		(0.3)		0.9		(1.3)		0.3		(1.0)
Net Investment Hedge Gains (Losses)	(117.4)		29.3		(88.1)		107.6		(26.8)		80.8
Net Change	$	(24.1)	$	25.9	$	1.8	$	34.4	$	(24.5)	$	9.9
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gains	$	12.6	$	(3.1)	$	9.5	$	—	$	—	$	—
Reclassification Adjustment for (Gains) Losses Included in Net Income(3)
Amortization of Net Actuarial Loss	10.7		(2.6)		8.1		5.7		(1.3)		4.4
Amortization of Prior Service Cost	(0.1)		—		(0.1)		(0.1)		—		(0.1)
Net Change	$	23.2	$	(5.7)	$	17.5	$	5.6	$	(1.3)	$	4.3
Total Net Change	$	46.1	$	8.0	$	54.1	$	113.2	$	(44.4)	$	68.8

See table footnotes under the YTD table.

	NINE MONTHS ENDED SEPTEMBER 30,
	2020						2019
(In Millions)	BEFORE TAX		TAX EFFECT		AFTER TAX		BEFORE TAX		TAX EFFECT		AFTER TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale
Unrealized Gains (Losses) on Debt Securities Available for Sale	$	736.8	$	(185.4)	$	551.4	$	409.0	$	(104.6)	$	304.4
Reclassification Adjustment for (Gains) Losses Included in Net Income(1)	(0.1)		—		(0.1)		0.6		—		0.6
Net Change	$	736.7	$	(185.4)	$	551.3	$	409.6	$	(104.6)	$	305.0
Unrealized Gains (Losses) on Cash Flow Hedges
Foreign Exchange Contracts	$	18.1	$	(4.5)	$	13.6	$	17.4	$	(4.3)	$	13.1
Interest Rate Contracts	0.2		(0.1)		0.1		1.4		(0.3)		1.1
Reclassification Adjustment for (Gains) Losses Included in Net Income(2)	(11.2)		2.8		(8.4)		(21.4)		5.3		(16.1)
Net Change	$	7.1	$	(1.8)	$	5.3	$	(2.6)	$	0.7	$	(1.9)
Foreign Currency Adjustments
Foreign Currency Translation Adjustments	$	53.1	$	(1.0)	$	52.1	$	(69.4)	$	3.3	$	(66.1)
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)	0.7		(0.2)		0.5		(1.3)		0.3		(1.0)
Net Investment Hedge Gains (Losses)	(29.8)		6.7		(23.1)		144.1		(38.2)		105.9
Net Change	$	24.0	$	5.5	$	29.5	$	73.4	$	(34.6)	$	38.8
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gains (Losses)	$	11.8	$	(3.0)	$	8.8	$	11.4	$	(3.1)	$	8.3
Reclassification Adjustment for (Gains) Losses Included in Net Income(3)
Amortization of Net Actuarial Loss	$	32.3	$	(7.8)	$	24.5	$	16.8	$	(4.1)	$	12.7
Amortization of Prior Service Cost	(0.2)		—		(0.2)		(0.2)		—		(0.2)
Net Change	$	43.9	$	(10.8)	$	33.1	$	28.0	$	(7.2)	$	20.8
Total Net Change	$	811.7	$	(192.5)	$	619.2	$	508.4	$	(145.7)	$	362.7

⁽¹⁾ The before-tax reclassification adjustment out of AOCI related to the realized gains (losses) on debt securities available for sale is recorded as Investment Security Gains (Losses), net within the consolidated statements of income.

⁽²⁾ See Note 20 — Derivative Financial Instruments for the location of the reclassification adjustment related to cash flow hedges.

⁽³⁾ The before-tax reclassification adjustment out of AOCI related to pension and other postretirement benefit adjustments is recorded in Employee Benefits expense within the consolidated statements of income.

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Net Income Per Common Share Computations (Tables)

9 Months Ended

Sep. 30, 2020

Earnings Per Share [Abstract]

Net Income per Common Share

The computations of net income per common share are presented in the following table.

TABLE 69: NET INCOME PER COMMON SHARE

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
($ In Millions Except Per Common Share Information)	2020		2019		2020		2019
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding	208,106,190		213,176,809		208,351,088		215,832,347
Net Income	$	294.5	$	384.6	$	968.4	$	1,121.1
Less: Dividends on Preferred Stock	16.2		17.4		51.5		40.6
Net Income Applicable to Common Stock	278.3		367.2		916.9		1,080.5
Less: Earnings Allocated to Participating Securities	3.3		4.5		10.6		12.6
Earnings Allocated to Common Shares Outstanding	275.0		362.7		906.3		1,067.9
Basic Net Income Per Common Share	$	1.32	$	1.70	$	4.35	$	4.95
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding	208,106,190		213,176,809		208,351,088		215,832,347
Plus: Dilutive Effect of Share-based Compensation	582,304		1,029,767		672,243		1,031,216
Average Common and Potential Common Shares	208,688,494		214,206,576		209,023,331		216,863,563
Earnings Allocated to Common and Potential Common Shares	$	275.0	$	362.7	$	906.3	$	1,067.9
Diluted Net Income Per Common Share	1.32		1.69		4.34		4.92

Note:    For the three and nine months ended September 30, 2020 and 2019, there were no common stock equivalents excluded in the computation of diluted net income per share.

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Revenue from Contracts with Clients (Tables)

9 Months Ended

Sep. 30, 2020

Revenue from Contract with Customer [Abstract]

Revenue Disaggregation

The following table presents revenues disaggregated by major revenue source.

TABLE 70: REVENUE DISAGGREGATION

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Noninterest Income
Trust, Investment and Other Servicing Fees
Custody and Fund Administration	$	416.4	$	414.8	$	1,231.7	$	1,219.7
Investment Management and Advisory	519.3		491.4		1,515.2		1,428.7
Securities Lending	19.8		20.1		70.7		64.9
Other	48.3		49.2		151.3		146.6
Total Trust, Investment and Other Servicing Fees	$	1,003.8	$	975.5	$	2,968.9	$	2,859.9
Other Noninterest Income
Foreign Exchange Trading Income	$	61.6	$	59.7	$	221.8	$	186.4
Treasury Management Fees	11.6		11.2		34.0		34.1
Security Commissions and Trading Income	26.0		29.1		100.9		75.8
Other Operating Income	53.5		45.1		144.4		113.0
Investment Security Gains (Losses), net	—		(0.4)		0.1		(0.9)
Total Other Noninterest Income	$	152.7	$	144.7	$	501.2	$	408.4
Total Noninterest Income	$	1,156.5	$	1,120.2	$	3,470.1	$	3,268.3

Contract Balances

The table below represents receivables balances from contracts with clients, which are included in Other Assets on the consolidated balance sheets, at September 30, 2020 and December 31, 2019.

TABLE 71: CLIENT RECEIVABLES

(In Millions)	SEPTEMBER 30, 2020		DECEMBER 31, 2019
Trust Fees Receivable, net(1)	$	805.7	$	801.9
Other	113.2		101.1
Total Client Receivables	$	918.9	$	903.0

⁽¹⁾ Trust Fees Receivable is net of a $7.3 million and $5.6 million fee receivable allowance as of September 30, 2020 and December 31, 2019, respectively.

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Net Interest Income (Tables)

9 Months Ended

Sep. 30, 2020

Banking and Thrift, Interest [Abstract]

Net Interest Income

The components of net interest income were as follows:

TABLE 72: NET INTEREST INCOME

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Interest Income
Loans and Leases	$	167.1	$	291.0	$	606.4	$	889.8
Securities — Taxable	182.6		265.9		632.1		812.4
— Non-Taxable	0.3		0.9		1.1		3.1
Interest-Bearing Due from and Deposits with Banks(1)	2.7		18.6		20.0		55.7
Federal Reserve and Other Central Bank Deposits and Other	2.7		44.4		31.3		162.8
Total Interest Income	$	355.4	$	620.8	$	1,290.9	$	1,923.8
Interest Expense
Deposits	$	(3.5)	$	122.0	$	56.7	$	403.5
Federal Funds Purchased	0.1		2.4		2.1		22.8
Securities Sold Under Agreements to Repurchase	—		1.6		1.0		5.4
Other Borrowings	5.0		46.0		40.6		145.2
Senior Notes	19.1		19.6		57.0		54.0
Long-Term Debt	5.7		9.4		21.1		29.4
Floating Rate Capital Debt	0.4		2.1		3.6		6.4
Total Interest Expense	$	26.8	$	203.1	$	182.1	$	666.7
Net Interest Income	$	328.6	$	417.7	$	1,108.8	$	1,257.1

⁽¹⁾    Interest-Bearing Due from and Deposits with Banks includes the interest-bearing component of Cash and Due from Banks and Interest-Bearing Deposits with Banks as presented on the consolidated balance sheets.

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Pension and Postretirement Health Care (Tables)

9 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Net Periodic Pension Expense (Benefit)

The following table sets forth the net periodic pension and postretirement benefit expense for Northern Trust’s U.S. Qualified Plan, Non-U.S. Pension Plans, U.S. Non-Qualified Plan, and postretirement health care plan for the three and nine months ended September 30, 2020 and 2019.

TABLE 73: NET PERIODIC PENSION EXPENSE (BENEFIT)

U.S. QUALIFIED PLAN	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Service Cost	$	11.9	$	10.4	$	35.5	$	31.2
Interest Cost	10.8		11.8		32.4		35.4
Expected Return on Plan Assets	(19.2)		(21.7)		(57.6)		(65.1)
Amortization
Net Actuarial Loss	8.8		4.3		26.4		12.9
Prior Service Cost	(0.1)		(0.1)		(0.3)		(0.3)
Net Periodic Pension Expense	$	12.2	$	4.7	$	36.4	$	14.1

NON-U.S. PENSION PLANS	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Service Cost	$	0.6	$	0.5	$	1.6	$	1.5
Interest Cost	0.7		0.9		2.1		2.9
Expected Return on Plan Assets	(0.8)		(1.0)		(2.3)		(2.9)
Settlement Expense	0.1		—		0.3		—
Amortization
Net Actuarial Loss	0.2		0.2		0.8		0.5
Prior Service Cost	0.1		—		0.1		—
Net Periodic Pension Expense	$	0.9	$	0.6	$	2.6	$	2.0

U.S. NON-QUALIFIED PLAN	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Service Cost	$	1.2	$	1.1	$	3.4	$	3.1
Interest Cost	1.2		1.5		3.6		4.4
Amortization
Net Actuarial Loss	1.7		1.4		5.3		4.2
Prior Service Cost	—		—		0.1		0.1
Net Periodic Pension Expense	$	4.1	$	4.0	$	12.4	$	11.8

POSTRETIREMENT HEALTH CARE PLAN	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Interest Cost	$	0.2	$	0.3	$	0.6	$	0.9
Amortization
Net Actuarial (Gain)	(0.1)		(0.2)		(0.5)		(0.8)
Prior Service Cost	(0.1)		—		(0.1)		—
Net Periodic Postretirement Expense	$	—	$	0.1	$	—	$	0.1

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Share-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2020

Share-based Payment Arrangement [Abstract]

Total Compensation Expense for Share-Based Payment Arrangements

Total compensation expense for share-based payment arrangements and the associated tax impacts were as follows for the three and nine months ended September 30, 2020 and 2019.

TABLE 74: TOTAL COMPENSATION EXPENSE FOR SHARE-BASED PAYMENT ARRANGEMENTS

	THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)	2020		2019		2020		2019
Restricted Stock Unit Awards	$	12.2	$	14.0	$	66.3	$	68.5
Stock Options	0.1		0.4		0.4		1.1
Performance Stock Units	1.6		2.9		16.1		21.7
Total Share-Based Compensation Expense	13.9		17.3		82.8		91.3
Tax Benefits Recognized	$	3.5	$	4.3	$	20.6	$	22.7

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Notional and Fair Value Amounts of Client-related and Trading Derivative Financial Instruments

The following table shows the notional and fair values of all derivative financial instruments as of September 30, 2020 and December 31, 2019.

TABLE 75: NOTIONAL AND FAIR VALUES OF DERIVATIVE FINANCIAL INSTRUMENTS

	SEPTEMBER 30, 2020						DECEMBER 31, 2019
	NOTIONAL VALUE		FAIR VALUE				NOTIONAL VALUE		FAIR VALUE
(In Millions)			ASSET(1)		LIABILITY(2)				ASSET(1)		LIABILITY(2)
Derivatives Designated as Hedging under GAAP
Interest Rate Contracts
Fair Value Hedges	$	5,357.8	$	10.2	$	18.9	$	4,538.2	$	20.3	$	20.9
Cash Flow Hedges	150.0		0.3		—		200.0		0.2		0.2
Foreign Exchange Contracts
Cash Flow Hedges	5,882.7		14.0		28.9		1,661.5		8.5		11.5
Net Investment Hedges	3,165.3		20.8		83.3		2,873.8		73.7		11.9
Total Derivatives Designated as Hedging under GAAP	$	14,555.8	$	45.3	$	131.1	$	9,273.5	$	102.7	$	44.5
Derivatives Not Designated as Hedging under GAAP
Non-Designated Risk Management Derivatives
Foreign Exchange Contracts	$	79.2	$	2.0	$	0.6	$	176.5	$	0.9	$	0.7
Other Financial Derivatives(3)	681.5		—		32.3		640.3		—		33.4
Total Non-Designated Risk Management Derivatives	$	760.7	$	2.0	$	32.9	$	816.8	$	0.9	$	34.1
Client-Related and Trading Derivatives
Foreign Exchange Contracts	$	255,799.4	$	2,242.7	$	2,213.5	$	291,533.6	$	3,151.7	$	3,158.1
Interest Rate Contracts	10,213.8		323.2		123.3		8,976.8		132.4		76.3
Total Client-Related and Trading Derivatives	$	266,013.2	$	2,565.9	$	2,336.8	$	300,510.4	$	3,284.1	$	3,234.4
Total Derivatives Not Designated as Hedging under GAAP	$	266,773.9	$	2,567.9	$	2,369.7	$	301,327.2	$	3,285.0	$	3,268.5
Total Gross Derivatives	$	281,329.7	$	2,613.2	$	2,500.8	$	310,600.7	$	3,387.7	$	3,313.0
Less: Netting(4)			1,408.3		1,603.3				2,338.0		1,618.4
Total Derivative Financial Instruments			$	1,204.9	$	897.5			$	1,049.7	$	1,694.6

⁽¹⁾    Derivative assets are reported in Other Assets on the consolidated balance sheets.

⁽²⁾    Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets.

⁽³⁾    This line includes swaps related to sales of certain Visa Class B common shares.

⁽⁴⁾    See further detail in Note 21 — Offsetting of Assets and Liabilities.

Cash Flow Hedge Derivative Gains and Losses Recognized in AOCI and Reclassified to Income

The following tables provide fair value and cash flow hedge derivative gains and losses recognized in income during the three- and nine- month periods ended September 30, 2020 and 2019.

TABLE 76: LOCATION AND AMOUNT OF FAIR VALUE AND CASH FLOW HEDGE DERIVATIVE GAINS AND LOSSES RECORDED IN INCOME

(In Millions)	INTEREST INCOME				INTEREST EXPENSE				OTHER OPERATING INCOME
THREE MONTHS ENDED SEPTEMBER 30,	2020		2019		2020		2019		2020		2019
Total amounts on the consolidated statements of income	$	355.4	$	620.8	$	26.8	$	203.1	$	53.5	$	45.1
Gains (Losses) on fair value hedges recognized on
Interest Rate Contracts
Recognized on derivatives	15.1		(14.9)		(2.9)		51.4		—		—
Recognized on hedged items	(15.1)		14.9		2.9		(51.4)		—		—
Amounts related to interest settlements on derivatives	(14.2)		2.8		(2.5)		(6.0)		—		—
Total gains (losses) recognized on fair value hedges	$	(14.2)	$	2.8	$	(2.5)	$	(6.0)	$	—	$	—
Gains (Losses) on cash flow hedges recognized on
Foreign Exchange Contracts
Net gains (losses) reclassified from AOCI to net income	$	4.2	$	2.7	$	—	$	—	$	0.3	$	1.4
Interest Rate Contracts
Net gains (losses) reclassified from AOCI to net income	0.2		(0.1)		—		—		—		—
Total gains (losses) reclassified from AOCI to net income on cash flow hedges	$	4.4	$	2.6	$	—	$	—	$	0.3	$	1.4

(In Millions)	INTEREST INCOME				INTEREST EXPENSE				OTHER OPERATING INCOME
NINE MONTHS ENDED SEPTEMBER 30,	2020		2019		2020		2019		2020		2019
Total amounts on the consolidated statements of income	$	1,290.9	$	1,923.8	$	182.1	$	666.7	$	144.4	$	113.0
Gains (Losses) on fair value hedges recognized on
Interest Rate Contracts
Recognized on derivatives	(75.6)		(99.0)		152.1		141.6		—		—
Recognized on hedged items	75.6		99.0		(152.1)		(141.6)		—		—
Amounts related to interest settlements on derivatives	(11.6)		13.3		6.1		(3.9)		—		—
Total gains (losses) recognized on fair value hedges	$	(11.6)	$	13.3	$	6.1	$	(3.9)	$	—	$	—
Gains (Losses) on cash flow hedges recognized on
Foreign Exchange Contracts
Net gains (losses) reclassified from AOCI to net income	$	10.8	$	20.8	$	—	$	—	$	0.1	$	1.1
Interest Rate Contracts
Net gains (losses) reclassified from AOCI to net income	0.3		(0.5)		—		—		—		—
Total gains (losses) reclassified from AOCI to net income on cash flow hedges	$	11.1	$	20.3	$	—	$	—	$	0.1	$	1.1

Location and Amount of Fair Value Hedge Derivative Gains and Losses Recorded in Income

The following table provides the impact of fair value hedge accounting on the carrying value of the designated hedged items as of September 30, 2020 and December 31, 2019.

TABLE 77: HEDGED ITEMS IN FAIR VALUE HEDGES

	SEPTEMBER 30, 2020				DECEMBER 31, 2019
(In Millions)	CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(1)		CARRYING VALUE OF THE HEDGED ITEMS		CUMULATIVE HEDGE ACCOUNTING BASIS ADJUSTMENT(2)
Available for Sale Debt Securities(3)	$	2,826.2	$	63.3	$	2,981.0	$	3.3
Senior Notes and Long-Term Subordinated Debt	2,745.0		261.8		1,748.5		126.9
Total	$	5,571.2	$	325.1	$	4,729.5	$	130.2

⁽¹⁾    The cumulative hedge accounting basis adjustment includes $6.7 million related to discontinued hedging relationships of available for sale debt securities as of September 30, 2020. There are no amounts related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of September 30, 2020.

⁽²⁾    The cumulative hedge accounting basis adjustment includes $1.5 million related to discontinued hedging relationships of available for sale debt securities as of December 31, 2019. There were no amounts related to discontinued hedging relationships in the cumulative hedge accounting basis adjustment of senior notes and long-term debt as of December 31, 2019.

⁽³⁾    Carrying value represents amortized cost.

Location and Amount of Gains and Losses Recorded in Income for Non-Designated Risk Management Derivative Instruments

The following table provides the location and amount of gains and losses recorded in the consolidated statements of income for the three and nine months ended September 30, 2020 and 2019 for derivative instruments not designated as hedges under GAAP.

TABLE 78: LOCATION AND AMOUNT OF GAINS AND LOSSES RECORDED IN INCOME FOR DERIVATIVES NOT DESIGNATED AS HEDGING UNDER GAAP

(In Millions)	DERIVATIVE GAINS (LOSSES) LOCATION RECOGNIZED IN INCOME	AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME
		THREE MONTHS ENDED SEPTEMBER 30,				NINE MONTHS ENDED SEPTEMBER 30,
		2020		2019		2020		2019
Non-designated risk management derivatives
Foreign Exchange Contracts	Other Operating Income	$	4.2	$	(1.8)	$	3.8	$	(1.7)
Other Financial Derivatives(1)	Other Operating Income	(5.3)		(6.4)		(11.0)		(17.8)
Gains (Losses) from non-designated risk management derivatives		$	(1.1)	$	(8.2)	$	(7.2)	$	(19.5)
Client-related and trading derivatives
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	61.6	$	59.7	$	221.8	$	186.4
Interest Rate Contracts	Security Commissions and Trading Income	2.3		4.9		18.5		9.2
Gains (Losses) from client-related and trading derivatives		$	63.9	$	64.6	$	240.3	$	195.6
Total gains (losses) from derivatives not designated as hedging under GAAP		$	62.8	$	56.4	$	233.1	$	176.1

⁽¹⁾    This line includes swaps related to the sale of certain Visa Class B common shares and total return swap contracts.

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Offsetting of Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Offsetting of Derivative Assets and Securities Purchased Under Agreements to Resell

The following table provides information regarding the offsetting of derivative assets and securities purchased under agreements to resell within the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

TABLE 79: OFFSETTING OF DERIVATIVE ASSETS AND SECURITIES PURCHASED UNDER AGREEMENTS TO RESELL

	SEPTEMBER 30, 2020
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(4)
Derivative Assets(1)
Foreign Exchange Contracts Over the Counter (OTC)	$	1,764.3	$	1,405.7	$	358.6	$	29.7	$	328.9
Interest Rate Swaps OTC	333.7		2.6		331.1		—		331.1
Total Derivatives Subject to a Master Netting Arrangement	2,098.0		1,408.3		689.7		29.7		660.0
Total Derivatives Not Subject to a Master Netting Arrangement	515.2		—		515.2		0.9		514.3
Total Derivatives	2,613.2		1,408.3		1,204.9		30.6		1,174.3
Securities Purchased under Agreements to Resell(3)	$	1,533.4	$	—	$	1,533.4	$	1,533.4	$	—

	DECEMBER 31, 2019
(In Millions)	GROSS RECOGNIZED ASSETS		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(4)
Derivative Assets(1)
Foreign Exchange Contracts OTC	$	2,691.1	$	2,334.1	$	357.0	$	16.5	$	340.5
Interest Rate Swaps OTC	151.9		3.9		148.0		—		148.0
Interest Rate Swaps Exchange Cleared	1.0		—		1.0		—		1.0
Total Derivatives Subject to a Master Netting Arrangement	2,844.0		2,338.0		506.0		16.5		489.5
Total Derivatives Not Subject to a Master Netting Arrangement	543.7		—		543.7		0.3		543.4
Total Derivatives	3,387.7		2,338.0		1,049.7		16.8		1,032.9
Securities Purchased under Agreements to Resell(3)	$	707.8	$	—	$	707.8	$	707.8	$	—

⁽¹⁾Derivative assets are reported in Other Assets on the consolidated balance sheets. Other Assets (excluding derivative assets) totaled $7.3 billion and $7.4 billion as of September 30, 2020 and December 31, 2019, respectively.

⁽²⁾Including cash collateral received from counterparties.

⁽³⁾Securities purchased under agreements to resell are reported in Federal Funds Sold and Securities Purchased under Agreements to Resell on the consolidated balance sheets. There were no Federal Funds Sold as of September 30, 2020 and $5.0 million of Federal Funds Sold as of December 31, 2019.

⁽⁴⁾Northern Trust did not possess any cash collateral that was not offset in the consolidated balance sheets that could have been used to offset the net amounts presented in the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

Offsetting of Derivative Liabilities and Securities Sold Under Agreements to Repurchase

The following table provides information regarding the offsetting of derivative liabilities and securities sold under agreements to repurchase within the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

TABLE 80: OFFSETTING OF DERIVATIVE LIABILITIES AND SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE

	SEPTEMBER 30, 2020
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(3)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	1,969.2	$	1,493.6	$	475.6	$	—	$	475.6
Interest Rate Swaps OTC	142.3		109.7		32.6		—		32.6
Other Financial Derivatives	32.3		—		32.3		—		32.3
Total Derivatives Subject to a Master Netting Arrangement	2,143.8		1,603.3		540.5		—		540.5
Total Derivatives Not Subject to a Master Netting Arrangement	357.0		—		357.0		—		357.0
Total Derivatives	2,500.8		1,603.3		897.5		—		897.5
Securities Sold under Agreements to Repurchase	$	269.8	$	—	$	269.8	$	269.8	$	—

	DECEMBER 31, 2019
(In Millions)	GROSS RECOGNIZED LIABILITIES		GROSS AMOUNTS OFFSET IN THE BALANCE SHEET(2)		NET AMOUNTS PRESENTED IN THE BALANCE SHEET		GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET		NET AMOUNT(3)
Derivative Liabilities(1)
Foreign Exchange Contracts OTC	$	2,181.6	$	1,548.6	$	633.0	$	0.1	$	632.9
Interest Rate Swaps OTC	96.7		57.3		39.4		—		39.4
Interest Rate Swaps Exchange Cleared	0.7		—		0.7		—		0.7
Other Financial Derivatives	33.4		12.5		20.9		—		20.9
Total Derivatives Subject to a Master Netting Arrangement	2,312.4		1,618.4		694.0		0.1		693.9
Total Derivatives Not Subject to a Master Netting Arrangement	1,000.6		—		1,000.6		—		1,000.6
Total Derivatives	3,313.0		1,618.4		1,694.6		0.1		1,694.5
Securities Sold under Agreements to Repurchase	$	489.7	$	—	$	489.7	$	489.7	$	—

⁽¹⁾Derivative liabilities are reported in Other Liabilities on the consolidated balance sheets. Other Liabilities (excluding derivative liabilities) totaled $3.6 billion and $3.1 billion as of September 30, 2020 and December 31, 2019, respectively.

⁽²⁾Including cash collateral deposited with counterparties.

⁽³⁾Northern Trust did not place any cash collateral with counterparties that was not offset in the consolidated balance sheets that could have been used to offset the net amounts presented in the consolidated balance sheets as of September 30, 2020 and December 31, 2019.

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Recent Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions	Jan. 01, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Allowance for credit loss		$ 215.4	$ 210.2		$ 104.5	$ 105.7	$ 110.8		$ 112.6
Stockholders equity		(11,579.1)	(11,382.2)	$ (10,879.7)	(11,091.0)	(10,811.3)	(10,805.5)	$ (10,616.2)	(10,508.3)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders equity		$ (12,118.3)	$ (11,988.4)	$ (11,828.1)	(11,656.7)	$ (11,441.2)	$ (11,225.5)	$ (10,972.9)	$ (10,776.8)
Cumulative Effect Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit loss	$ 13.7				(2.2)
Stockholders equity					10.1
Cumulative Effect Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders equity	$ 10.1				$ 10.1

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Fair Value Measurements (Narrative) (Details) shares in Millions, $ in Millions	Sep. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security	Jun. 30, 2016 shares	Jun. 30, 2015 shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale	$ 42,551.0	$ 38,876.3
Trading account securities	$ 0.6	$ 0.3
Visa Class B
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Shares issued (in shares) | shares			1.1	1.0
LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of available for sale securities portfolio | security	2,086	1,704
Available-for-sale	$ 38,400.0	$ 34,300.0
LEVEL 2 | External Pricing
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of available for sale securities portfolio | security		1,704
Trading account securities		$ 0.3
LEVEL 3 | Fair Value, Measurements, Nonrecurring | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans, measurement input	0.152
LEVEL 3 | Fair Value, Measurements, Nonrecurring | Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 21.2

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Fair Value Measurements (Level 3 Significant Unobservable Inputs) (Details) $ in Millions	Sep. 30, 2020 USD ($) month	Dec. 31, 2019 USD ($) month
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities | $	$ 897.5	$ 1,694.6
Swap | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities | $	$ 32.3	$ 33.4
Swap | Conversion Rate | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	1.62	1.62
Swap | Visa Class A Appreciation | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	0.0870	0.0854
Swap | Expected Duration | Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	20	22
Swap | Expected Duration | Fair Value, Measurements, Recurring | LEVEL 3 | Lower Limit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	12	12
Swap | Expected Duration | Fair Value, Measurements, Recurring | LEVEL 3 | Upper Limit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability, measurement input	33	36

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Fair Value Measurements (Recurring Basis Hierarchy Leveling) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	$ 42,551.0	$ 38,876.3
Derivative Assets	2,613.2	3,387.7
NETTING	(1,408.3)	(2,338.0)
Derivative Assets	1,204.9	1,049.7
Derivative Liabilities	2,500.8	3,313.0
NETTING	(1,603.3)	(1,618.4)
Derivative Liabilities	897.5	1,694.6
Cross Product Collateral Adjustment
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
NETTING	(212.7)	(1,136.8)
NETTING	(407.7)	(417.2)
U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	4,165.2	4,549.1
Obligations of States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,600.5	1,615.3
Government Sponsored Agency
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	24,568.8	23,271.2
Non-U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	937.6	3.3
Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,627.4	2,402.7
Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	516.8	769.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,552.8	2,127.6
Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,559.4	3,330.5
Commercial Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,015.2	797.7
Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	7.3	9.0
LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	38,400.0	34,300.0
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	42,551.0	38,876.3
Trading Account	0.6	0.3
Total Available for Sale and Trading Debt Securities	42,551.6	38,876.6
Fair Value, Measurements, Recurring | U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	4,165.2	4,549.1
Fair Value, Measurements, Recurring | Obligations of States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,600.5	1,615.3
Fair Value, Measurements, Recurring | Government Sponsored Agency
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	24,568.8	23,271.2
Fair Value, Measurements, Recurring | Non-U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	937.6	3.3
Fair Value, Measurements, Recurring | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,627.4	2,402.7
Fair Value, Measurements, Recurring | Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	516.8	769.9
Fair Value, Measurements, Recurring | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,552.8	2,127.6
Fair Value, Measurements, Recurring | Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,559.4	3,330.5
Fair Value, Measurements, Recurring | Commercial Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,015.2	797.7
Fair Value, Measurements, Recurring | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	7.3	9.0
Fair Value, Measurements, Recurring | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
NETTING	(1,408.3)	(2,338.0)
Derivative Assets	1,204.9	1,049.7
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
NETTING	(1,405.7)	(2,334.1)
Derivative Assets	873.8	900.7
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
NETTING	(2.6)	(3.9)
Derivative Assets	331.1	149.0
Fair Value, Measurements, Recurring | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
NETTING	(1,603.3)	(1,618.4)
Derivative Liabilities	897.5	1,694.6
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
NETTING	(1,493.6)	(1,548.6)
Derivative Liabilities	832.7	1,633.6
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
NETTING	(109.7)	(57.3)
Derivative Liabilities	32.5	40.1
Fair Value, Measurements, Recurring | Other Liabilities | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
NETTING	0.0	(12.5)
Derivative Liabilities	32.3	20.9
Fair Value, Measurements, Recurring | LEVEL 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	4,165.2	4,549.1
Trading Account	0.3	0.0
Total Available for Sale and Trading Debt Securities	4,165.5	4,549.1
Fair Value, Measurements, Recurring | LEVEL 1 | U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	4,165.2	4,549.1
Fair Value, Measurements, Recurring | LEVEL 1 | Obligations of States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Government Sponsored Agency
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Non-U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Commercial Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 1 | Other Liabilities | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	38,385.8	34,327.2
Trading Account	0.3	0.3
Total Available for Sale and Trading Debt Securities	38,386.1	34,327.5
Fair Value, Measurements, Recurring | LEVEL 2 | U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 2 | Obligations of States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,600.5	1,615.3
Fair Value, Measurements, Recurring | LEVEL 2 | Government Sponsored Agency
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	24,568.8	23,271.2
Fair Value, Measurements, Recurring | LEVEL 2 | Non-U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	937.6	3.3
Fair Value, Measurements, Recurring | LEVEL 2 | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,627.4	2,402.7
Fair Value, Measurements, Recurring | LEVEL 2 | Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	516.8	769.9
Fair Value, Measurements, Recurring | LEVEL 2 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	2,552.8	2,127.6
Fair Value, Measurements, Recurring | LEVEL 2 | Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	3,559.4	3,330.5
Fair Value, Measurements, Recurring | LEVEL 2 | Commercial Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	1,015.2	797.7
Fair Value, Measurements, Recurring | LEVEL 2 | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	7.3	9.0
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	2,613.2	3,387.7
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	2,279.5	3,234.8
Fair Value, Measurements, Recurring | LEVEL 2 | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	333.7	152.9
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	2,468.5	3,279.6
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	2,326.3	3,182.2
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	142.2	97.4
Fair Value, Measurements, Recurring | LEVEL 2 | Other Liabilities | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Trading Account	0.0	0.0
Total Available for Sale and Trading Debt Securities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Obligations of States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Government Sponsored Agency
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Non-U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Commercial Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available-for-sale	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	32.3	33.4
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	0.0	0.0
Fair Value, Measurements, Recurring | LEVEL 3 | Other Liabilities | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	$ 32.3	$ 33.4

XML

Fair Value Measurements (Changes in Level 3 Liabilities) (Details) - SWAPS RELATED TO SALE OF CERTAIN VISA CLASS B COMMON SHARES - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair value liabilities beginning balance	$ 31.3	$ 34.7	$ 33.4	$ 32.8
Total (Gains) Losses:
Included in Earnings	5.3	6.7	11.0	14.9
Purchases, Issues, Sales, and Settlements
Settlements	(4.3)	(3.7)	(12.1)	(10.0)
Fair value liabilities ending balance	$ 32.3	$ 37.7	$ 32.3	$ 37.7

XML

Fair Value Measurements (Nonrecurring Basis Significant Unobservable Inputs) (Details) - Fair Value, Measurements, Nonrecurring - LEVEL 3 $ in Millions	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019
Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FAIR VALUE	$ 21.2
Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
INPUT VALUES	0.152
Measurement Input, Discount Rate | Lower Limit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
INPUT VALUES	0.150	0.150
Measurement Input, Discount Rate | Upper Limit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
INPUT VALUES	0.200	0.200	0.200
Measurement Input, Discount Rate | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
INPUT VALUES		0.153
Loans | Measurement Input, Discount Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
FAIR VALUE	$ 21.2	$ 8.0

XML

Fair Value Measurements (Fair Value of Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
ASSETS
Cash and Due from Banks	$ 4,737.5	$ 4,459.2
Federal Reserve and Other Central Bank Deposits	39,244.6	33,886.0
Interest-Bearing Deposits with Banks	2,754.4	4,877.1
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,533.4	712.8
Debt Securities
Available-for-sale	42,551.0	38,876.3
Debt securities, held-to-maturity	16,754.0	12,284.5
Loans (excluding Leases)
Client Security Settlement Receivables	2,296.8	845.7
Deposits
Savings Certificates and Other Time	1,486.7	986.7
Non U.S. Offices Interest-Bearing	61,345.6	60,400.3
Federal Funds Purchased	2,203.7	552.9
Securities Sold Under Agreements to Repurchase	269.8	489.7
Other Borrowings	5,771.7	6,744.8
Senior Notes	3,655.6	2,573.0
Long-Term Debt
Floating Rate Capital Debt	277.7	277.7
Derivative Instruments
Assets	2,098.0	2,844.0
Liabilities	2,143.8	2,312.4
LEVEL 2
Debt Securities
Available-for-sale	38,400.0	34,300.0
BOOK VALUE
ASSETS
Cash and Due from Banks	4,737.5	4,459.2
Federal Reserve and Other Central Bank Deposits	39,244.6	33,886.0
Interest-Bearing Deposits with Banks	2,754.4	4,877.1
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,533.4	712.8
Debt Securities
Available-for-sale	42,551.0	38,876.3
Debt securities, held-to-maturity	16,754.0	12,284.5
Trading Account	0.6	0.3
Loans (excluding Leases)
Held for Investment	32,521.2	31,239.5
Client Security Settlement Receivables	2,296.8	845.7
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	239.7	301.2
Community Development Investments	761.3	749.3
Employee Benefit and Deferred Compensation	214.6	199.5
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	59,756.8	47,733.6
Savings Certificates and Other Time	1,486.7	986.7
Non U.S. Offices Interest-Bearing	61,345.6	60,400.3
Federal Funds Purchased	2,203.7	552.9
Securities Sold Under Agreements to Repurchase	269.8	489.7
Other Borrowings	5,771.7	6,744.8
Senior Notes	3,655.6	2,573.0
Long-Term Debt
Subordinated Debt	1,196.0	1,148.1
Floating Rate Capital Debt	277.7	277.7
Other Liabilities
Standby Letters of Credit	23.9	25.5
Loan Commitments	55.7	32.3
BOOK VALUE | Asset/Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets	36.8	83.1
Liabilities	112.8	24.1
BOOK VALUE | Asset/Liability Management | Interest Rate Contracts
Derivative Instruments
Assets	10.5	20.5
Liabilities	18.9	21.1
BOOK VALUE | Asset/Liability Management | Other Financial Derivatives
Derivative Instruments
Liabilities	32.3	33.4
BOOK VALUE | Client-Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets	2,242.7	3,151.7
Liabilities	2,213.5	3,158.1
BOOK VALUE | Client-Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets	323.2	132.4
Liabilities	123.3	76.3
TOTAL FAIR VALUE
ASSETS
Cash and Due from Banks	4,737.5	4,459.2
Federal Reserve and Other Central Bank Deposits	39,244.6	33,886.0
Interest-Bearing Deposits with Banks	2,754.4	4,877.1
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,533.4	712.8
Debt Securities
Available-for-sale	42,551.0	38,876.3
Debt securities, held-to-maturity	16,746.5	12,249.3
Trading Account	0.6	0.3
Loans (excluding Leases)
Held for Investment	33,001.4	31,517.8
Client Security Settlement Receivables	2,296.8	845.7
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	239.7	301.2
Community Development Investments	761.3	749.3
Employee Benefit and Deferred Compensation	230.0	207.6
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	59,756.8	47,733.6
Savings Certificates and Other Time	1,496.5	994.2
Non U.S. Offices Interest-Bearing	61,345.6	60,400.3
Federal Funds Purchased	2,203.7	552.9
Securities Sold Under Agreements to Repurchase	269.8	489.7
Other Borrowings	5,772.9	6,745.9
Senior Notes	3,731.0	2,593.0
Long-Term Debt
Subordinated Debt	1,250.0	1,169.5
Floating Rate Capital Debt	255.6	262.1
Other Liabilities
Standby Letters of Credit	23.9	25.5
Loan Commitments	55.7	32.3
TOTAL FAIR VALUE | Asset/Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets	36.8	83.1
Liabilities	112.8	24.1
TOTAL FAIR VALUE | Asset/Liability Management | Interest Rate Contracts
Derivative Instruments
Assets	10.5	20.5
Liabilities	18.9	21.1
TOTAL FAIR VALUE | Asset/Liability Management | Other Financial Derivatives
Derivative Instruments
Liabilities	32.3	33.4
TOTAL FAIR VALUE | Client-Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets	2,242.7	3,151.7
Liabilities	2,213.5	3,158.1
TOTAL FAIR VALUE | Client-Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets	323.2	132.4
Liabilities	123.3	76.3
TOTAL FAIR VALUE | LEVEL 1
ASSETS
Cash and Due from Banks	4,737.5	4,459.2
Federal Reserve and Other Central Bank Deposits	0.0	0.0
Interest-Bearing Deposits with Banks	0.0	0.0
Federal Funds Sold and Securities Purchased under Agreements to Resell	0.0	0.0
Debt Securities
Available-for-sale	4,165.2	4,549.1
Debt securities, held-to-maturity	99.0	138.8
Trading Account	0.3	0.0
Loans (excluding Leases)
Held for Investment	0.0	0.0
Client Security Settlement Receivables	0.0	0.0
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	0.0	0.0
Community Development Investments	0.0	0.0
Employee Benefit and Deferred Compensation	143.6	131.0
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	59,756.8	47,733.6
Savings Certificates and Other Time	0.0	0.0
Non U.S. Offices Interest-Bearing	0.0	0.0
Federal Funds Purchased	0.0	0.0
Securities Sold Under Agreements to Repurchase	0.0	0.0
Other Borrowings	0.0	0.0
Senior Notes	0.0	0.0
Long-Term Debt
Subordinated Debt	0.0	0.0
Floating Rate Capital Debt	0.0	0.0
Other Liabilities
Standby Letters of Credit	0.0	0.0
Loan Commitments	0.0	0.0
TOTAL FAIR VALUE | LEVEL 1 | Asset/Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets	0.0	0.0
Liabilities	0.0	0.0
TOTAL FAIR VALUE | LEVEL 1 | Asset/Liability Management | Interest Rate Contracts
Derivative Instruments
Assets	0.0	0.0
Liabilities	0.0	0.0
TOTAL FAIR VALUE | LEVEL 1 | Asset/Liability Management | Other Financial Derivatives
Derivative Instruments
Liabilities	0.0	0.0
TOTAL FAIR VALUE | LEVEL 1 | Client-Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets	0.0	0.0
Liabilities	0.0	0.0
TOTAL FAIR VALUE | LEVEL 1 | Client-Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets	0.0	0.0
Liabilities	0.0	0.0
TOTAL FAIR VALUE | LEVEL 2
ASSETS
Cash and Due from Banks	0.0	0.0
Federal Reserve and Other Central Bank Deposits	39,244.6	33,886.0
Interest-Bearing Deposits with Banks	2,754.4	4,877.1
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,533.4	712.8
Debt Securities
Available-for-sale	38,385.8	34,327.2
Debt securities, held-to-maturity	16,647.5	12,110.5
Trading Account	0.3	0.3
Loans (excluding Leases)
Held for Investment	0.0	0.0
Client Security Settlement Receivables	2,296.8	845.7
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	239.7	301.2
Community Development Investments	761.3	749.3
Employee Benefit and Deferred Compensation	86.4	76.6
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	0.0	0.0
Savings Certificates and Other Time	1,496.5	994.2
Non U.S. Offices Interest-Bearing	61,345.6	60,400.3
Federal Funds Purchased	2,203.7	552.9
Securities Sold Under Agreements to Repurchase	269.8	489.7
Other Borrowings	5,772.9	6,745.9
Senior Notes	3,731.0	2,593.0
Long-Term Debt
Subordinated Debt	1,250.0	1,169.5
Floating Rate Capital Debt	255.6	262.1
Other Liabilities
Standby Letters of Credit	0.0	0.0
Loan Commitments	0.0	0.0
TOTAL FAIR VALUE | LEVEL 2 | Asset/Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets	36.8	83.1
Liabilities	112.8	24.1
TOTAL FAIR VALUE | LEVEL 2 | Asset/Liability Management | Interest Rate Contracts
Derivative Instruments
Assets	10.5	20.5
Liabilities	18.9	21.1
TOTAL FAIR VALUE | LEVEL 2 | Asset/Liability Management | Other Financial Derivatives
Derivative Instruments
Liabilities	0.0	0.0
TOTAL FAIR VALUE | LEVEL 2 | Client-Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets	2,242.7	3,151.7
Liabilities	2,213.5	3,158.1
TOTAL FAIR VALUE | LEVEL 2 | Client-Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets	323.2	132.4
Liabilities	123.3	76.3
TOTAL FAIR VALUE | LEVEL 3
ASSETS
Cash and Due from Banks	0.0	0.0
Federal Reserve and Other Central Bank Deposits	0.0	0.0
Interest-Bearing Deposits with Banks	0.0	0.0
Federal Funds Sold and Securities Purchased under Agreements to Resell	0.0	0.0
Debt Securities
Available-for-sale	0.0	0.0
Debt securities, held-to-maturity	0.0	0.0
Trading Account	0.0	0.0
Loans (excluding Leases)
Held for Investment	33,001.4	31,517.8
Client Security Settlement Receivables	0.0	0.0
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	0.0	0.0
Community Development Investments	0.0	0.0
Employee Benefit and Deferred Compensation	0.0	0.0
Deposits
Demand, Noninterest-Bearing, Savings, Money Market and Other Interest-Bearing	0.0	0.0
Savings Certificates and Other Time	0.0	0.0
Non U.S. Offices Interest-Bearing	0.0	0.0
Federal Funds Purchased	0.0	0.0
Securities Sold Under Agreements to Repurchase	0.0	0.0
Other Borrowings	0.0	0.0
Senior Notes	0.0	0.0
Long-Term Debt
Subordinated Debt	0.0	0.0
Floating Rate Capital Debt	0.0	0.0
Other Liabilities
Standby Letters of Credit	23.9	25.5
Loan Commitments	55.7	32.3
TOTAL FAIR VALUE | LEVEL 3 | Asset/Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets	0.0	0.0
Liabilities	0.0	0.0
TOTAL FAIR VALUE | LEVEL 3 | Asset/Liability Management | Interest Rate Contracts
Derivative Instruments
Assets	0.0	0.0
Liabilities	0.0	0.0
TOTAL FAIR VALUE | LEVEL 3 | Asset/Liability Management | Other Financial Derivatives
Derivative Instruments
Liabilities	32.3	33.4
TOTAL FAIR VALUE | LEVEL 3 | Client-Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets	0.0	0.0
Liabilities	0.0	0.0
TOTAL FAIR VALUE | LEVEL 3 | Client-Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets	0.0	0.0
Liabilities	$ 0.0	$ 0.0

XML

Securities (Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Total	$ 41,659.2	$ 38,722.2
GROSS UNREALIZED GAINS	926.8	262.7
GROSS UNREALIZED LOSSES	35.0	108.6
FAIR VALUE	42,551.0	38,876.3
U.S. Government
Investment Holdings [Line Items]
Total	4,083.9	4,527.5
GROSS UNREALIZED GAINS	81.3	26.7
GROSS UNREALIZED LOSSES	0.0	5.1
FAIR VALUE	4,165.2	4,549.1
Obligations of States and Political Subdivisions
Investment Holdings [Line Items]
Total	2,465.2	1,604.0
GROSS UNREALIZED GAINS	136.3	24.6
GROSS UNREALIZED LOSSES	1.0	13.3
FAIR VALUE	2,600.5	1,615.3
Government Sponsored Agency
Investment Holdings [Line Items]
Total	24,162.6	23,247.5
GROSS UNREALIZED GAINS	427.4	101.8
GROSS UNREALIZED LOSSES	21.2	78.1
FAIR VALUE	24,568.8	23,271.2
Non-U.S. Government
Investment Holdings [Line Items]
Total	936.8	3.3
GROSS UNREALIZED GAINS	0.9	0.0
GROSS UNREALIZED LOSSES	0.1	0.0
FAIR VALUE	937.6	3.3
Corporate Debt
Investment Holdings [Line Items]
Total	2,548.7	2,378.9
GROSS UNREALIZED GAINS	80.9	27.8
GROSS UNREALIZED LOSSES	2.2	4.0
FAIR VALUE	2,627.4	2,402.7
Covered Bonds
Investment Holdings [Line Items]
Total	508.5	766.3
GROSS UNREALIZED GAINS	8.3	4.4
GROSS UNREALIZED LOSSES	0.0	0.8
FAIR VALUE	516.8	769.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Investment Holdings [Line Items]
Total	2,486.4	2,091.3
GROSS UNREALIZED GAINS	66.7	37.4
GROSS UNREALIZED LOSSES	0.3	1.1
FAIR VALUE	2,552.8	2,127.6
Other Asset-Backed
Investment Holdings [Line Items]
Total	3,522.3	3,324.5
GROSS UNREALIZED GAINS	46.6	11.3
GROSS UNREALIZED LOSSES	9.5	5.3
FAIR VALUE	3,559.4	3,330.5
Commercial Mortgage-Backed
Investment Holdings [Line Items]
Total	937.5	769.9
GROSS UNREALIZED GAINS	78.4	28.7
GROSS UNREALIZED LOSSES	0.7	0.9
FAIR VALUE	1,015.2	797.7
Other
Investment Holdings [Line Items]
Total	7.3	9.0
GROSS UNREALIZED GAINS	0.0	0.0
GROSS UNREALIZED LOSSES	0.0	0.0
FAIR VALUE	$ 7.3	$ 9.0

XML

Securities (Remaining Maturity of Securities Available for Sale and Held to Maturity) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Available for Sale - Cost
Due in One Year or Less	$ 9,976.3
Due After One Year Through Five Years	19,133.2
Due After Five Years Through Ten Years	9,932.4
Due After Ten Years	2,617.3
Total	41,659.2	$ 38,722.2
Available for Sale - Value
Due in One Year or Less	10,076.0
Due After One Year Through Five Years	19,537.8
Due After Five Years Through Ten Years	10,258.7
Due After Ten Years	2,678.5
Total	42,551.0	38,876.3
Held to Maturity - Amortized Cost
Due in One Year or Less	10,516.1
Due After One Year Through Five Years	5,813.7
Due After Five Years Through Ten Years	312.7
Due After Ten Years	111.5
Total	16,754.0	12,284.5
Held to Maturity - Fair Value
Due in One Year or Less	10,527.0
Due After One Year Through Five Years	5,859.4
Due After Five Years Through Ten Years	304.0
Due After Ten Years	56.1
Total	16,746.5	12,249.3
U.S. Government
Available for Sale - Cost
Due in One Year or Less	1,802.3
Due After One Year Through Five Years	1,834.8
Due After Five Years Through Ten Years	446.8
Due After Ten Years	0.0
Total	4,083.9	4,527.5
Available for Sale - Value
Due in One Year or Less	1,805.4
Due After One Year Through Five Years	1,876.1
Due After Five Years Through Ten Years	483.7
Due After Ten Years	0.0
Total	4,165.2	4,549.1
Held to Maturity - Amortized Cost
Due in One Year or Less	99.0
Due After One Year Through Five Years	0.0
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	99.0	138.8
Held to Maturity - Fair Value
Due in One Year or Less	99.0
Due After One Year Through Five Years	0.0
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	99.0	138.8
Obligations of States and Political Subdivisions
Available for Sale - Cost
Due in One Year or Less	16.4
Due After One Year Through Five Years	210.9
Due After Five Years Through Ten Years	2,187.7
Due After Ten Years	50.2
Total	2,465.2	1,604.0
Available for Sale - Value
Due in One Year or Less	16.4
Due After One Year Through Five Years	222.8
Due After Five Years Through Ten Years	2,311.0
Due After Ten Years	50.3
Total	2,600.5	1,615.3
Held to Maturity - Amortized Cost
Due in One Year or Less	1.6
Due After One Year Through Five Years	1.0
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	2.6	10.1
Held to Maturity - Fair Value
Due in One Year or Less	1.6
Due After One Year Through Five Years	1.1
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	2.7	10.3
Government Sponsored Agency
Available for Sale - Cost
Due in One Year or Less	6,077.0
Due After One Year Through Five Years	9,520.9
Due After Five Years Through Ten Years	6,111.1
Due After Ten Years	2,453.6
Total	24,162.6	23,247.5
Available for Sale - Value
Due in One Year or Less	6,160.5
Due After One Year Through Five Years	9,669.4
Due After Five Years Through Ten Years	6,224.2
Due After Ten Years	2,514.7
Total	24,568.8	23,271.2
Held to Maturity - Amortized Cost
Due in One Year or Less	0.5
Due After One Year Through Five Years	1.5
Due After Five Years Through Ten Years	0.9
Due After Ten Years	0.5
Total	3.4	4.1
Held to Maturity - Fair Value
Due in One Year or Less	0.6
Due After One Year Through Five Years	1.6
Due After Five Years Through Ten Years	1.0
Due After Ten Years	0.5
Total	3.7	4.3
Non-U.S. Government
Available for Sale - Cost
Due in One Year or Less	737.9
Due After One Year Through Five Years	40.7
Due After Five Years Through Ten Years	158.2
Due After Ten Years	0.0
Total	936.8
Available for Sale - Value
Due in One Year or Less	738.2
Due After One Year Through Five Years	40.6
Due After Five Years Through Ten Years	158.8
Due After Ten Years	0.0
Total	937.6
Held to Maturity - Amortized Cost
Due in One Year or Less	7,291.5
Due After One Year Through Five Years	260.3
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	7,551.8	4,076.0
Held to Maturity - Fair Value
Due in One Year or Less	7,293.2
Due After One Year Through Five Years	266.5
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	7,559.7	4,078.8
Corporate Debt
Available for Sale - Cost
Due in One Year or Less	547.1
Due After One Year Through Five Years	2,001.6
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	2,548.7	2,378.9
Available for Sale - Value
Due in One Year or Less	552.9
Due After One Year Through Five Years	2,074.5
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	2,627.4	2,402.7
Held to Maturity - Amortized Cost
Due in One Year or Less	125.0
Due After One Year Through Five Years	405.3
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	530.3	405.1
Held to Maturity - Fair Value
Due in One Year or Less	125.2
Due After One Year Through Five Years	410.6
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	535.8	406.2
Covered Bonds
Available for Sale - Cost
Due in One Year or Less	24.4
Due After One Year Through Five Years	484.1
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	508.5	766.3
Available for Sale - Value
Due in One Year or Less	24.5
Due After One Year Through Five Years	492.3
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	516.8	769.9
Held to Maturity - Amortized Cost
Due in One Year or Less	1,228.1
Due After One Year Through Five Years	2,133.6
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	3,361.7	3,006.7
Held to Maturity - Fair Value
Due in One Year or Less	1,233.1
Due After One Year Through Five Years	2,153.0
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	3,386.1	3,020.4
Certificates of Deposit
Held to Maturity - Amortized Cost
Due in One Year or Less	726.3
Due After One Year Through Five Years	0.0
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	726.3	262.9
Held to Maturity - Fair Value
Due in One Year or Less	726.3
Due After One Year Through Five Years	0.0
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	726.3	262.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Available for Sale - Cost
Due in One Year or Less	334.9
Due After One Year Through Five Years	2,046.0
Due After Five Years Through Ten Years	105.5
Due After Ten Years	0.0
Total	2,486.4	2,091.3
Available for Sale - Value
Due in One Year or Less	335.1
Due After One Year Through Five Years	2,111.8
Due After Five Years Through Ten Years	105.9
Due After Ten Years	0.0
Total	2,552.8	2,127.6
Held to Maturity - Amortized Cost
Due in One Year or Less	832.7
Due After One Year Through Five Years	2,325.2
Due After Five Years Through Ten Years	232.6
Due After Ten Years	0.0
Total	3,390.5	3,285.4
Held to Maturity - Fair Value
Due in One Year or Less	837.1
Due After One Year Through Five Years	2,362.7
Due After Five Years Through Ten Years	233.2
Due After Ten Years	0.0
Total	3,433.0	3,305.0
Other Asset-Backed
Available for Sale - Cost
Due in One Year or Less	412.4
Due After One Year Through Five Years	2,658.0
Due After Five Years Through Ten Years	356.0
Due After Ten Years	95.9
Total	3,522.3	3,324.5
Available for Sale - Value
Due in One Year or Less	419.0
Due After One Year Through Five Years	2,690.0
Due After Five Years Through Ten Years	354.5
Due After Ten Years	95.9
Total	3,559.4	3,330.5
Held to Maturity - Amortized Cost
Due in One Year or Less	190.1
Due After One Year Through Five Years	435.4
Due After Five Years Through Ten Years	20.3
Due After Ten Years	0.0
Total	645.8	804.3
Held to Maturity - Fair Value
Due in One Year or Less	190.1
Due After One Year Through Five Years	435.8
Due After Five Years Through Ten Years	20.4
Due After Ten Years	0.0
Total	646.3	804.7
Commercial Mortgage-Backed
Available for Sale - Cost
Due in One Year or Less	16.6
Due After One Year Through Five Years	336.2
Due After Five Years Through Ten Years	567.1
Due After Ten Years	17.6
Total	937.5	769.9
Available for Sale - Value
Due in One Year or Less	16.7
Due After One Year Through Five Years	360.3
Due After Five Years Through Ten Years	620.6
Due After Ten Years	17.6
Total	1,015.2	797.7
Other
Available for Sale - Cost
Due in One Year or Less	7.3
Due After One Year Through Five Years	0.0
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	7.3	9.0
Available for Sale - Value
Due in One Year or Less	7.3
Due After One Year Through Five Years	0.0
Due After Five Years Through Ten Years	0.0
Due After Ten Years	0.0
Total	7.3	9.0
Held to Maturity - Amortized Cost
Due in One Year or Less	21.3
Due After One Year Through Five Years	251.4
Due After Five Years Through Ten Years	58.9
Due After Ten Years	111.0
Total	442.6	291.1
Held to Maturity - Fair Value
Due in One Year or Less	20.8
Due After One Year Through Five Years	228.1
Due After Five Years Through Ten Years	49.4
Due After Ten Years	55.6
Total	$ 353.9	$ 217.9

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Securities (Securities with Unrealized Losses) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Fair Value
Less than 12 months, fair value	$ 3,758.4	$ 7,850.3
12 months or longer fair value	3,943.4	10,615.2
Total fair value	7,701.8	18,465.5
Unrealized Losses
Less than 12 months, unrealized losses	10.8	57.0
12 months or longer unrealized losses	24.2	51.6
Total unrealized losses	35.0	108.6
U.S. Government
Fair Value
Less than 12 months, fair value		252.2
12 months or longer fair value		899.7
Total fair value		1,151.9
Unrealized Losses
Less than 12 months, unrealized losses		2.8
12 months or longer unrealized losses		2.3
Total unrealized losses		5.1
Obligations of States and Political Subdivisions
Fair Value
Less than 12 months, fair value	230.4	902.4
12 months or longer fair value	0.0	0.0
Total fair value	230.4	902.4
Unrealized Losses
Less than 12 months, unrealized losses	1.0	13.3
12 months or longer unrealized losses	0.0	0.0
Total unrealized losses	1.0	13.3
Government Sponsored Agency
Fair Value
Less than 12 months, fair value	2,578.6	5,405.0
12 months or longer fair value	2,862.3	7,818.4
Total fair value	5,440.9	13,223.4
Unrealized Losses
Less than 12 months, unrealized losses	6.8	35.6
12 months or longer unrealized losses	14.4	42.5
Total unrealized losses	21.2	78.1
Non-U.S. Government
Fair Value
Less than 12 months, fair value	26.5
12 months or longer fair value	0.0
Total fair value	26.5
Unrealized Losses
Less than 12 months, unrealized losses	0.1
12 months or longer unrealized losses	0.0
Total unrealized losses	0.1
Corporate Debt
Fair Value
Less than 12 months, fair value	69.1	279.3
12 months or longer fair value	76.1	492.7
Total fair value	145.2	772.0
Unrealized Losses
Less than 12 months, unrealized losses	1.0	1.1
12 months or longer unrealized losses	1.2	2.9
Total unrealized losses	2.2	4.0
Covered Bonds
Fair Value
Less than 12 months, fair value		138.7
12 months or longer fair value		25.0
Total fair value		163.7
Unrealized Losses
Less than 12 months, unrealized losses		0.7
12 months or longer unrealized losses		0.1
Total unrealized losses		0.8
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Fair Value
Less than 12 months, fair value	146.3	217.5
12 months or longer fair value	158.7	155.2
Total fair value	305.0	372.7
Unrealized Losses
Less than 12 months, unrealized losses	0.2	1.0
12 months or longer unrealized losses	0.1	0.1
Total unrealized losses	0.3	1.1
Other Asset-Backed
Fair Value
Less than 12 months, fair value	631.2	592.4
12 months or longer fair value	846.3	1,164.9
Total fair value	1,477.5	1,757.3
Unrealized Losses
Less than 12 months, unrealized losses	1.0	1.8
12 months or longer unrealized losses	8.5	3.5
Total unrealized losses	9.5	5.3
Commercial Mortgage-Backed
Fair Value
Less than 12 months, fair value	76.3	62.8
12 months or longer fair value	0.0	59.3
Total fair value	76.3	122.1
Unrealized Losses
Less than 12 months, unrealized losses	0.7	0.7
12 months or longer unrealized losses	0.0	0.2
Total unrealized losses	$ 0.7	$ 0.9

XML

Securities (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) investment	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) investment	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt and Equity Securities, FV-NI [Line Items]
Number of securities in an unrealized loss position | investment	475		475
Total fair value	$ 7,700,000,000		$ 7,700,000,000
Total unrealized losses	35,000,000.0		35,000,000.0
Provision for credit losses	500,000	$ (7,000,000.0)	127,500,000	$ (13,500,000)
Debt securities, held-to-maturity	16,754,000,000.0		16,754,000,000.0		$ 12,284,500,000
Debt Securities, held-to-maturity, unrealized loss position, fair value	88,700,000		88,700,000
Held to maturity securities, transferred from available for sale	0	160,800,000	301,500,000	160,800,000
Gross proceeds from sale of securities	0	$ 177,300,000	689,200,000	$ 406,600,000
AA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	2,491,900,000		2,491,900,000
A
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	$ 6,172,500,000		$ 6,172,500,000
Percentage of debt securities, held-to-maturity, portfolio	0.37		0.37
NOT RATED
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	$ 1,168,900,000		$ 1,168,900,000
Government Sponsored Agency
Debt and Equity Securities, FV-NI [Line Items]
Total unrealized losses	21,200,000		21,200,000
Debt securities, held-to-maturity	3,400,000		3,400,000		4,100,000
Government Sponsored Agency | AA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	0		0
Government Sponsored Agency | A
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	0		0
Government Sponsored Agency | NOT RATED
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	0		0
Other Asset-Backed
Debt and Equity Securities, FV-NI [Line Items]
Total unrealized losses	9,500,000		9,500,000
Debt securities, held-to-maturity	645,800,000		645,800,000		804,300,000
Other Asset-Backed | AA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	0		0
Other Asset-Backed | A
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	0		0
Other Asset-Backed | NOT RATED
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	0		0
Corporate Debt
Debt and Equity Securities, FV-NI [Line Items]
Total unrealized losses	$ 2,200,000		$ 2,200,000
Percent of corporate debt portfolio	21.00%		21.00%
Provision for credit losses	$ 0		$ 0
Debt securities, held-to-maturity	530,300,000		530,300,000		405,100,000
Corporate Debt | AA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	254,700,000		254,700,000
Corporate Debt | A
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	272,000,000.0		272,000,000.0
Corporate Debt | NOT RATED
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	0		0
Other
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	442,600,000		442,600,000		291,100,000
Other | AA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	0		0
Other | A
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	0		0
Other | NOT RATED
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	442,600,000		442,600,000
U.S. Government
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	$ 99,000,000.0		$ 99,000,000.0		$ 138,800,000
Percentage of debt securities, held-to-maturity, portfolio	0.41		0.41
U.S. Government | AA
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	$ 0		$ 0
Percentage of debt securities, held-to-maturity, portfolio	0.15		0.15
U.S. Government | A
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	$ 0		$ 0
U.S. Government | NOT RATED
Debt and Equity Securities, FV-NI [Line Items]
Debt securities, held-to-maturity	$ 0		$ 0
Percentage of debt securities, held-to-maturity, portfolio	0.07		0.07

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Securities (Reconciliation of Amortized Cost to Fair Value of Securities Held to Maturity) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Total	$ 16,754.0	$ 12,284.5
Gross Unrealized Gains	82.9	45.7
Gross Unrealized Losses	90.4	80.9
Fair Value	16,746.5	12,249.3
U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Total	99.0	138.8
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	99.0	138.8
Obligations of States and Political Subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Total	2.6	10.1
Gross Unrealized Gains	0.1	0.2
Gross Unrealized Losses	0.0	0.0
Fair Value	2.7	10.3
Government Sponsored Agency
Schedule of Held-to-maturity Securities [Line Items]
Total	3.4	4.1
Gross Unrealized Gains	0.3	0.2
Gross Unrealized Losses	0.0	0.0
Fair Value	3.7	4.3
Corporate Debt
Schedule of Held-to-maturity Securities [Line Items]
Total	530.3	405.1
Gross Unrealized Gains	5.5	1.4
Gross Unrealized Losses	0.0	0.3
Fair Value	535.8	406.2
Covered Bonds
Schedule of Held-to-maturity Securities [Line Items]
Total	3,361.7	3,006.7
Gross Unrealized Gains	25.4	16.1
Gross Unrealized Losses	1.0	2.4
Fair Value	3,386.1	3,020.4
Certificates of Deposit
Schedule of Held-to-maturity Securities [Line Items]
Total	726.3	262.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Fair Value	726.3	262.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Schedule of Held-to-maturity Securities [Line Items]
Total	3,390.5	3,285.4
Gross Unrealized Gains	42.8	21.7
Gross Unrealized Losses	0.3	2.1
Fair Value	3,433.0	3,305.0
Other Asset-Backed
Schedule of Held-to-maturity Securities [Line Items]
Total	645.8	804.3
Gross Unrealized Gains	0.7	0.7
Gross Unrealized Losses	0.2	0.3
Fair Value	646.3	804.7
Other
Schedule of Held-to-maturity Securities [Line Items]
Total	442.6	291.1
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	88.7	73.3
Fair Value	353.9	217.9
Non-U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Total	7,551.8	4,076.0
Gross Unrealized Gains	8.1	5.3
Gross Unrealized Losses	0.2	2.5
Fair Value	$ 7,559.7	$ 4,078.8

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Securities (Credit Quality Indicators) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	$ 16,754.0	$ 12,284.5
AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	6,872.7
AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	2,491.9
A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	6,172.5
BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	48.0
NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	1,168.9
U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	99.0	138.8
U.S. Government | AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	99.0
U.S. Government | AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
U.S. Government | A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
U.S. Government | BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
U.S. Government | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Obligations of States and Political Subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	2.6	10.1
Obligations of States and Political Subdivisions | AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Obligations of States and Political Subdivisions | AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.6
Obligations of States and Political Subdivisions | A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.7
Obligations of States and Political Subdivisions | BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	1.3
Obligations of States and Political Subdivisions | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Government Sponsored Agency
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	3.4	4.1
Government Sponsored Agency | AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	3.4
Government Sponsored Agency | AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Government Sponsored Agency | A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Government Sponsored Agency | BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Government Sponsored Agency | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Non-U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	7,551.8	4,076.0
Non-U.S. Government | AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	335.6
Non-U.S. Government | AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	1,269.7
Non-U.S. Government | A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	5,899.8
Non-U.S. Government | BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	46.7
Non-U.S. Government | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Corporate Debt
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	530.3	405.1
Corporate Debt | AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	3.6
Corporate Debt | AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	254.7
Corporate Debt | A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	272.0
Corporate Debt | BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Corporate Debt | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Covered Bonds
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	3,361.7	3,006.7
Covered Bonds | AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	3,361.7
Covered Bonds | AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Covered Bonds | A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Covered Bonds | BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Covered Bonds | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Certificates of Deposit
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	726.3	262.9
Certificates of Deposit | AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Certificates of Deposit | AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Certificates of Deposit | A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Certificates of Deposit | BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Certificates of Deposit | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	726.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	3,390.5	3,285.4
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	2,423.6
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	966.9
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Other Asset-Backed
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	645.8	804.3
Other Asset-Backed | AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	645.8
Other Asset-Backed | AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Other Asset-Backed | A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Other Asset-Backed | BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Other Asset-Backed | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Other
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	442.6	$ 291.1
Other | AAA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Other | AA
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Other | A
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Other | BBB
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	0.0
Other | NOT RATED
Schedule of Held-to-maturity Securities [Line Items]
Debt securities, held-to-maturity	$ 442.6

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Securities (Investment Security Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Gross Realized Debt Securities Gains	$ 0.0		$ 0.1	$ 3.4	$ 1.6
Gross Realized Debt Securities Losses	0.0		(0.4)	(3.3)	(2.2)
Changes in Other-Than-Temporary Impairment Losses	0.0	$ (4.4)	(0.1)	0.0	(0.3)
Net Investment Security (Losses) Gains	$ 0.0		$ (0.4)	$ 0.1	$ (0.9)

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Securities Sold Under Agreements to Repurchase (Repurchase Agreements Accounted for as Secured Borrowings) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Gross Amount of Recognized Liabilities for Repurchase Agreements in Note 21	$ 540.5	$ 693.9
OVERNIGHT AND CONTINUOUS
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Borrowings	269.8	489.7
Gross Amount of Recognized Liabilities for Repurchase Agreements in Note 21	269.8	489.7
Amounts related to agreements not included in Note 21	0.0	0.0
OVERNIGHT AND CONTINUOUS | U.S. Treasury and Agency Securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Borrowings	$ 269.8	$ 489.7

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Loans and Leases (Loans and Leases) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	$ 32,766.3	$ 31,409.6
Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	338.7
COMMERCIAL
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	14,581.7	14,001.3
COMMERCIAL | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	9,524.0	9,091.1
COMMERCIAL | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	3,373.6	3,104.3
COMMERCIAL | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	1,441.0	1,576.3
COMMERCIAL | Lease Financing, net
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	30.1	65.6
COMMERCIAL | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	213.0	164.0
Personal
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	18,184.6	17,408.3
Personal | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	11,893.0	11,071.4
Personal | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	5,928.3	6,095.0
Personal | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	338.7	174.8
Personal | Other
Financing Receivable, Credit Quality Indicator [Line Items]
TOTAL LOANS AND LEASES	$ 24.6	$ 67.1

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Loans and Leases (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) loan	Mar. 31, 2019 loan	Sep. 30, 2020 USD ($) loan contract	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 32,766,300,000		$ 32,766,300,000	$ 31,409,600,000
Other U.S. loans and non-U.S. loans, short duration advances	1,300,000,000		1,300,000,000	1,100,000,000
Demand deposits	11,600,000		11,600,000	90,400,000
Financing receivable, nonaccrual troubled debt restructuring	67,500,000		67,500,000	54,900,000
Financing receivable, recorded investment	33,000,000.0		33,000,000.0	27,700,000	$ 1,700,000	$ 1,600,000
Financing receivable, troubled debt restructuring, commitment to lend	11,000,000.0		11,000,000.0	8,200,000
Foreclosed real estate properties, carrying value	900,000		900,000	3,200,000
Loans in process of foreclosure	11,700,000		$ 11,700,000
CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, modifications, number of contracts paid off | contract			31
Financing receivable, non-TDR modifications, recorded investment paid off			$ 34,300,000
Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 215,300,000		215,300,000
Loan processing fee			$ 2,600,000
Number of loans approved for forgiveness | loan	0		0
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, troubled debt restructuring, subsequent default, number of contracts | loan	0	3	0
Lease Agreements
Accounts, Notes, Loans and Financing Receivable [Line Items]
Held for sale	$ 18,600,000		$ 18,600,000	53,600,000
Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Held for sale	0		0	0
Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 18,184,600,000		$ 18,184,600,000	17,408,300,000
Personal | Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral required on Residential real estate loan, lower limit	65.00%		65.00%
Collateral required on Residential real estate loan, upper limit	80.00%		80.00%
Loans and leases	$ 5,928,300,000		$ 5,928,300,000	6,095,000,000.0
Personal | Home Equity Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Draw period for credit line products			10 years
Loans and leases	$ 351,800,000		$ 351,800,000	$ 448,500,000
Percentage of total equity credit lines	97.00%		97.00%	97.00%
COMMERCIAL
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 14,581,700,000		$ 14,581,700,000	$ 14,001,300,000
COMMERCIAL | Commercial and Institutional
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	9,524,000,000.0		9,524,000,000.0	$ 9,091,100,000
COMMERCIAL | Commercial and Institutional | Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	$ 215,300,000		$ 215,300,000
Number of contracts | loan	1,127,000,000		1,127,000,000
Financing receivable, average balance per loan	$ 200,000		$ 200,000

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Loans and Leases (Credit Quality Indicator At Amortized Cost By Origination Year) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 5,922.4
2019	4,025.0
2018	1,447.2
2017	1,218.9
2016	1,447.8
PRIOR	3,293.7
REVOLVING LOANS	15,041.0
REVOLVING LOANS CONVERTED TO TERM LOANS	370.3
Total Loans and Leases	32,766.3	$ 31,409.6
Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2020	21.4
2019	44.2
2018	11.9
2017	0.5
2016	0.5
PRIOR	10.2
REVOLVING LOANS	244.9
REVOLVING LOANS CONVERTED TO TERM LOANS	5.1
Total Loans and Leases	338.7
Non-U.S. | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	8.6
2019	21.5
2018	0.0
2017	0.0
2016	0.0
PRIOR	1.8
REVOLVING LOANS	28.2
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	60.1
Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	12.8
2019	22.7
2018	11.9
2017	0.5
2016	0.5
PRIOR	8.2
REVOLVING LOANS	216.7
REVOLVING LOANS CONVERTED TO TERM LOANS	5.1
Total Loans and Leases	278.4
Non-U.S. | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0.0
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.2
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	0.2
COMMERCIAL
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,980.3
2019	2,344.3
2018	1,037.3
2017	794.0
2016	844.3
PRIOR	1,301.1
REVOLVING LOANS	5,203.9
REVOLVING LOANS CONVERTED TO TERM LOANS	76.5
Total Loans and Leases	14,581.7	14,001.3
COMMERCIAL | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
2020	895.9
2019	1,285.8
2018	626.9
2017	600.2
2016	639.3
PRIOR	666.1
REVOLVING LOANS	4,757.7
REVOLVING LOANS CONVERTED TO TERM LOANS	52.1
Total Loans and Leases	9,524.0	9,091.1
COMMERCIAL | Commercial and Institutional | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	245.2
2019	571.6
2018	208.2
2017	142.8
2016	457.8
PRIOR	465.2
REVOLVING LOANS	3,286.6
REVOLVING LOANS CONVERTED TO TERM LOANS	2.0
Total Loans and Leases	5,379.4
COMMERCIAL | Commercial and Institutional | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	614.0
2019	579.5
2018	379.7
2017	428.4
2016	143.0
PRIOR	180.4
REVOLVING LOANS	1,346.4
REVOLVING LOANS CONVERTED TO TERM LOANS	50.1
Total Loans and Leases	3,721.5
COMMERCIAL | Commercial and Institutional | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	36.7
2019	134.7
2018	39.0
2017	29.0
2016	38.5
PRIOR	20.5
REVOLVING LOANS	124.7
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	423.1
COMMERCIAL | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	820.4
2019	1,018.9
2018	398.4
2017	183.1
2016	205.0
PRIOR	526.3
REVOLVING LOANS	198.9
REVOLVING LOANS CONVERTED TO TERM LOANS	22.6
Total Loans and Leases	3,373.6	3,104.3
COMMERCIAL | Commercial Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	359.5
2019	205.7
2018	71.8
2017	40.5
2016	24.9
PRIOR	113.4
REVOLVING LOANS	126.5
REVOLVING LOANS CONVERTED TO TERM LOANS	8.9
Total Loans and Leases	951.2
COMMERCIAL | Commercial Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	453.4
2019	758.0
2018	294.1
2017	110.6
2016	178.5
PRIOR	383.9
REVOLVING LOANS	72.4
REVOLVING LOANS CONVERTED TO TERM LOANS	13.7
Total Loans and Leases	2,264.6
COMMERCIAL | Commercial Real Estate | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	7.5
2019	55.2
2018	32.5
2017	32.0
2016	1.6
PRIOR	29.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	157.8
COMMERCIAL | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,051.0
2019	39.6
2018	12.0
2017	10.7
2016	0.0
PRIOR	78.6
REVOLVING LOANS	247.3
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8
Total Loans and Leases	1,441.0	1,576.3
COMMERCIAL | Non-U.S. | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	790.8
2019	15.9
2018	10.0
2017	10.7
2016	0.0
PRIOR	0.0
REVOLVING LOANS	32.2
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	859.6
COMMERCIAL | Non-U.S. | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	259.5
2019	0.6
2018	2.0
2017	0.0
2016	0.0
PRIOR	78.6
REVOLVING LOANS	37.2
REVOLVING LOANS CONVERTED TO TERM LOANS	1.8
Total Loans and Leases	379.7
COMMERCIAL | Non-U.S. | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0.7
2019	23.1
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.0
REVOLVING LOANS	177.9
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	201.7
COMMERCIAL | Lease Financing, net
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0.0
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	30.1
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	30.1	65.6
COMMERCIAL | Lease Financing, net | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0.0
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	18.5
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	18.5
COMMERCIAL | Lease Financing, net | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0.0
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	11.6
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	11.6
COMMERCIAL | Lease Financing, net | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0.0
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	0.0
COMMERCIAL | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2020	213.0
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	213.0	164.0
COMMERCIAL | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	97.7
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	97.7
COMMERCIAL | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	115.3
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	115.3
COMMERCIAL | Other | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0.0
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	0.0
Personal
Financing Receivable, Credit Quality Indicator [Line Items]
2020	2,942.1
2019	1,680.7
2018	409.9
2017	424.9
2016	603.5
PRIOR	1,992.6
REVOLVING LOANS	9,837.1
REVOLVING LOANS CONVERTED TO TERM LOANS	293.8
Total Loans and Leases	18,184.6	17,408.3
Personal | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
2020	940.3
2019	888.4
2018	208.8
2017	130.8
2016	112.3
PRIOR	231.1
REVOLVING LOANS	9,101.5
REVOLVING LOANS CONVERTED TO TERM LOANS	279.8
Total Loans and Leases	11,893.0	11,071.4
Personal | Private Client | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	466.3
2019	394.3
2018	56.8
2017	67.6
2016	34.2
PRIOR	150.2
REVOLVING LOANS	5,087.1
REVOLVING LOANS CONVERTED TO TERM LOANS	126.1
Total Loans and Leases	6,382.6
Personal | Private Client | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	468.4
2019	493.6
2018	129.6
2017	60.0
2016	78.1
PRIOR	80.9
REVOLVING LOANS	3,952.3
REVOLVING LOANS CONVERTED TO TERM LOANS	145.7
Total Loans and Leases	5,408.6
Personal | Private Client | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5.6
2019	0.5
2018	22.4
2017	3.2
2016	0.0
PRIOR	0.0
REVOLVING LOANS	62.1
REVOLVING LOANS CONVERTED TO TERM LOANS	8.0
Total Loans and Leases	101.8
Personal | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,955.8
2019	748.1
2018	189.2
2017	293.6
2016	490.7
PRIOR	1,751.3
REVOLVING LOANS	490.7
REVOLVING LOANS CONVERTED TO TERM LOANS	8.9
Total Loans and Leases	5,928.3	6,095.0
Personal | Residential Real Estate | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	1,322.9
2019	396.2
2018	60.9
2017	108.9
2016	254.2
PRIOR	738.0
REVOLVING LOANS	188.2
REVOLVING LOANS CONVERTED TO TERM LOANS	1.5
Total Loans and Leases	3,070.8
Personal | Residential Real Estate | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	619.8
2019	342.5
2018	126.6
2017	184.2
2016	233.8
PRIOR	904.6
REVOLVING LOANS	270.2
REVOLVING LOANS CONVERTED TO TERM LOANS	7.4
Total Loans and Leases	2,689.1
Personal | Residential Real Estate | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	13.1
2019	9.4
2018	1.7
2017	0.5
2016	2.7
PRIOR	108.7
REVOLVING LOANS	32.3
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	168.4
Personal | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans and Leases	338.7	174.8
Personal | Other
Financing Receivable, Credit Quality Indicator [Line Items]
2020	24.6
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	24.6	$ 67.1
Personal | Other | 1 to 3 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	5.5
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	5.5
Personal | Other | 4 to 5 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	19.1
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	19.1
Personal | Other | 6 to 9 Category
Financing Receivable, Credit Quality Indicator [Line Items]
2020	0.0
2019	0.0
2018	0.0
2017	0.0
2016	0.0
PRIOR	0.0
REVOLVING LOANS	0.0
REVOLVING LOANS CONVERTED TO TERM LOANS	0.0
Total Loans and Leases	$ 0.0

XML

Loans and Leases (Delinquency Status) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	$ 32,572.0	$ 31,230.6
TOTAL ACCRUAL	32,668.3	31,326.0
NONACCRUAL	98.0	83.6
Total Loans and Leases	32,766.3	31,409.6
NONACCRUAL WITH NO ALLOWANCE	70.9	70.6
Other Real Estate Owned	0.9	3.2
Total Nonaccrual Assets	98.9	86.8
Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans and Leases	338.7
30 – 59 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	64.8	59.6
60 – 89 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	22.9	28.4
90 DAYS OR MORE PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	8.6	7.4
COMMERCIAL
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	14,516.0	13,963.8
TOTAL ACCRUAL	14,547.6	13,990.1
NONACCRUAL	34.1	11.2
Total Loans and Leases	14,581.7	14,001.3
NONACCRUAL WITH NO ALLOWANCE	15.4	3.2
COMMERCIAL | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	9,470.9	9,068.3
TOTAL ACCRUAL	9,493.8	9,083.5
NONACCRUAL	30.2	7.6
Total Loans and Leases	9,524.0	9,091.1
NONACCRUAL WITH NO ALLOWANCE	11.5	0.8
COMMERCIAL | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	3,361.0	3,089.6
TOTAL ACCRUAL	3,369.7	3,100.7
NONACCRUAL	3.9	3.6
Total Loans and Leases	3,373.6	3,104.3
NONACCRUAL WITH NO ALLOWANCE	3.9	2.4
COMMERCIAL | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	1,441.0	1,576.3
TOTAL ACCRUAL	1,441.0	1,576.3
NONACCRUAL	0.0	0.0
Total Loans and Leases	1,441.0	1,576.3
NONACCRUAL WITH NO ALLOWANCE	0.0	0.0
COMMERCIAL | Lease Financing, net
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	30.1	65.6
TOTAL ACCRUAL	30.1	65.6
NONACCRUAL	0.0	0.0
Total Loans and Leases	30.1	65.6
NONACCRUAL WITH NO ALLOWANCE	0.0	0.0
COMMERCIAL | Other
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	213.0	164.0
TOTAL ACCRUAL	213.0	164.0
NONACCRUAL	0.0	0.0
Total Loans and Leases	213.0	164.0
NONACCRUAL WITH NO ALLOWANCE	0.0	0.0
COMMERCIAL | 30 – 59 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	22.5	6.4
COMMERCIAL | 30 – 59 DAYS PAST DUE | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	21.9	4.1
COMMERCIAL | 30 – 59 DAYS PAST DUE | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.6	2.3
COMMERCIAL | 30 – 59 DAYS PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
COMMERCIAL | 30 – 59 DAYS PAST DUE | Lease Financing, net
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
COMMERCIAL | 30 – 59 DAYS PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
COMMERCIAL | 60 – 89 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	8.3	14.0
COMMERCIAL | 60 – 89 DAYS PAST DUE | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.2	9.9
COMMERCIAL | 60 – 89 DAYS PAST DUE | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	8.1	4.1
COMMERCIAL | 60 – 89 DAYS PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
COMMERCIAL | 60 – 89 DAYS PAST DUE | Lease Financing, net
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
COMMERCIAL | 60 – 89 DAYS PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
COMMERCIAL | 90 DAYS OR MORE PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.8	5.9
COMMERCIAL | 90 DAYS OR MORE PAST DUE | Commercial and Institutional
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.8	1.2
COMMERCIAL | 90 DAYS OR MORE PAST DUE | Commercial Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	4.7
COMMERCIAL | 90 DAYS OR MORE PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
COMMERCIAL | 90 DAYS OR MORE PAST DUE | Lease Financing, net
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
COMMERCIAL | 90 DAYS OR MORE PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
Personal
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	18,056.0	17,266.8
TOTAL ACCRUAL	18,120.7	17,335.9
NONACCRUAL	63.9	72.4
Total Loans and Leases	18,184.6	17,408.3
NONACCRUAL WITH NO ALLOWANCE	55.5	67.4
Personal | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	11,832.8	11,027.9
TOTAL ACCRUAL	11,893.0	11,070.9
NONACCRUAL	0.0	0.5
Total Loans and Leases	11,893.0	11,071.4
NONACCRUAL WITH NO ALLOWANCE	0.0	0.5
Personal | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	5,859.9	5,997.7
TOTAL ACCRUAL	5,864.4	6,023.6
NONACCRUAL	63.9	71.4
Total Loans and Leases	5,928.3	6,095.0
NONACCRUAL WITH NO ALLOWANCE	55.5	66.4
Personal | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	338.7	174.1
TOTAL ACCRUAL	338.7	174.3
NONACCRUAL	0.0	0.5
Total Loans and Leases	338.7	174.8
NONACCRUAL WITH NO ALLOWANCE	0.0	0.5
Personal | Other
Financing Receivable, Credit Quality Indicator [Line Items]
CURRENT	24.6	67.1
TOTAL ACCRUAL	24.6	67.1
NONACCRUAL	0.0	0.0
Total Loans and Leases	24.6	67.1
NONACCRUAL WITH NO ALLOWANCE	0.0	0.0
Personal | 30 – 59 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	42.3	53.2
Personal | 30 – 59 DAYS PAST DUE | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	39.4	33.2
Personal | 30 – 59 DAYS PAST DUE | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	2.9	19.8
Personal | 30 – 59 DAYS PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.2
Personal | 30 – 59 DAYS PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
Personal | 60 – 89 DAYS PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	14.6	14.4
Personal | 60 – 89 DAYS PAST DUE | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	13.3	9.5
Personal | 60 – 89 DAYS PAST DUE | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	1.3	4.9
Personal | 60 – 89 DAYS PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
Personal | 60 – 89 DAYS PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
Personal | 90 DAYS OR MORE PAST DUE
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	7.8	1.5
Personal | 90 DAYS OR MORE PAST DUE | Private Client
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	7.5	0.3
Personal | 90 DAYS OR MORE PAST DUE | Residential Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.3	1.2
Personal | 90 DAYS OR MORE PAST DUE | Non-U.S.
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	0.0	0.0
Personal | 90 DAYS OR MORE PAST DUE | Other
Financing Receivable, Credit Quality Indicator [Line Items]
Past Due	$ 0.0	$ 0.0

XML

Loans and Leases (Troubled Debt Restructurings) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 USD ($) contract	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 USD ($) contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract	11	5	19	34
RECORDED INVESTMENT	$ 18.4	$ 3.1	$ 43.6	$ 28.2
UNPAID PRINCIPAL BALANCE	$ 18.5	$ 3.1	$ 44.2	$ 29.6
COMMERCIAL
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract	1	0	3	3
RECORDED INVESTMENT	$ 1.0	$ 0.0	$ 25.3	$ 7.6
UNPAID PRINCIPAL BALANCE	$ 1.0	$ 0.0	$ 25.5	$ 8.8
COMMERCIAL | Commercial and Institutional
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract	1	0	3	1
RECORDED INVESTMENT	$ 1.0	$ 0.0	$ 25.3	$ 7.6
UNPAID PRINCIPAL BALANCE	$ 1.0	$ 0.0	$ 25.5	$ 8.8
COMMERCIAL | Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract		0		2
RECORDED INVESTMENT		$ 0.0		$ 0.0
UNPAID PRINCIPAL BALANCE		$ 0.0		$ 0.0
Personal
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract	10	5	16	31
RECORDED INVESTMENT	$ 17.4	$ 3.1	$ 18.3	$ 20.6
UNPAID PRINCIPAL BALANCE	$ 17.5	$ 3.1	$ 18.7	$ 20.8
Personal | Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract	10	5	16	31
RECORDED INVESTMENT	$ 17.4	$ 3.1	$ 18.3	$ 20.6
UNPAID PRINCIPAL BALANCE	$ 17.5	$ 3.1	$ 18.7	$ 20.8

XML

Loans and Leases (COVID-19 Loan Modifications Not Considered TDRS) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 contract	Sep. 30, 2019 contract	Sep. 30, 2020 USD ($) contract	Sep. 30, 2019 contract
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract	11	5	19	34
CARES Act | Active Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			70,000,000
RECORDED INVESTMENT			$ 105.0
UNPAID PRINCIPAL BALANCE			0.6
DEFERRED INTEREST AMOUNT			$ 0.9
CARES Act | Completed Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			585,000,000
RECORDED INVESTMENT			$ 1,034.3
UNPAID PRINCIPAL BALANCE			10.7
DEFERRED INTEREST AMOUNT			$ 7.9
COMMERCIAL
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract	1	0	3	3
COMMERCIAL | CARES Act | Active Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			15,000,000
RECORDED INVESTMENT			$ 80.5
UNPAID PRINCIPAL BALANCE			0.3
DEFERRED INTEREST AMOUNT			$ 0.5
COMMERCIAL | CARES Act | Completed Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			205,000,000
RECORDED INVESTMENT			$ 671.9
UNPAID PRINCIPAL BALANCE			7.9
DEFERRED INTEREST AMOUNT			$ 4.8
COMMERCIAL | Commercial and Institutional
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract	1	0	3	1
COMMERCIAL | Commercial and Institutional | CARES Act | Active Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			13,000,000
RECORDED INVESTMENT			$ 73.2
UNPAID PRINCIPAL BALANCE			0.3
DEFERRED INTEREST AMOUNT			$ 0.5
COMMERCIAL | Commercial and Institutional | CARES Act | Completed Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			101,000,000
RECORDED INVESTMENT			$ 199.7
UNPAID PRINCIPAL BALANCE			5.0
DEFERRED INTEREST AMOUNT			$ 1.5
COMMERCIAL | Commercial Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract		0		2
COMMERCIAL | Commercial Real Estate | CARES Act | Active Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			2,000,000
RECORDED INVESTMENT			$ 7.3
UNPAID PRINCIPAL BALANCE			0.0
DEFERRED INTEREST AMOUNT			$ 0.0
COMMERCIAL | Commercial Real Estate | CARES Act | Completed Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			104,000,000
RECORDED INVESTMENT			$ 472.2
UNPAID PRINCIPAL BALANCE			2.9
DEFERRED INTEREST AMOUNT			$ 3.3
Personal
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract	10	5	16	31
Personal | CARES Act | Active Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			55,000,000
RECORDED INVESTMENT			$ 24.5
UNPAID PRINCIPAL BALANCE			0.3
DEFERRED INTEREST AMOUNT			$ 0.4
Personal | CARES Act | Completed Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			380,000,000
RECORDED INVESTMENT			$ 362.4
UNPAID PRINCIPAL BALANCE			2.8
DEFERRED INTEREST AMOUNT			$ 3.1
Personal | Private Client | CARES Act | Active Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			2,000,000
RECORDED INVESTMENT			$ 5.2
UNPAID PRINCIPAL BALANCE			0.0
DEFERRED INTEREST AMOUNT			$ 0.1
Personal | Private Client | CARES Act | Completed Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			34,000,000
RECORDED INVESTMENT			$ 177.6
UNPAID PRINCIPAL BALANCE			2.3
DEFERRED INTEREST AMOUNT			$ 1.1
Personal | Residential Real Estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract	10	5	16	31
Personal | Residential Real Estate | CARES Act | Active Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			53,000,000
RECORDED INVESTMENT			$ 19.3
UNPAID PRINCIPAL BALANCE			0.3
DEFERRED INTEREST AMOUNT			$ 0.3
Personal | Residential Real Estate | CARES Act | Completed Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
NUMBER OF LOANS AND LEASES | contract			346,000,000
RECORDED INVESTMENT			$ 184.8
UNPAID PRINCIPAL BALANCE			0.5
DEFERRED INTEREST AMOUNT			$ 2.0

XML

Allowance for Credit Losses (Narrative) (Details) - USD ($)		3 Months Ended			9 Months Ended
	Jan. 01, 2020	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Allowance for credit loss		$ 215,400,000		$ 105,700,000	$ 215,400,000	$ 105,700,000	$ 210,200,000	$ 104,500,000	$ 110,800,000		$ 112,600,000
Stockholders equity		(11,579,100,000)	$ (10,879,700,000)	(10,811,300,000)	(11,579,100,000)	(10,811,300,000)	(11,382,200,000)	(11,091,000,000.0)	(10,805,500,000)	$ (10,616,200,000)	(10,508,300,000)
Credit loss expense (reversal) and available-for-sale, allowance for credit loss		500,000		(7,000,000.0)	127,500,000	(13,500,000)
Net (charge-offs) recoveries		400,000		600,000	$ 2,300,000	3,000,000.0
Time period used for projecting future conditions to estimate credit losses					2 years
Interest income that would have been recorded for nonperforming loans				1,800,000		5,700,000
Financing receivable accrued interest income		1,100,000			$ 3,500,000
Other-than-temporary impairment loss, debt securities, portion recognized in earnings		0	4,400,000	100,000	0	300,000
Other financial assets, allowance for credit loss		700,000			700,000		1,300,000	0
Other Financial Assets
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable accrued interest income		0		0	0	0
Cumulative Effect Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit loss	$ 13,700,000							(2,200,000)
Stockholders equity								10,100,000
Other financial assets, allowance for credit loss								400,000
Retained Earnings
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders equity		$ (12,118,300,000)	$ (11,828,100,000)	$ (11,441,200,000)	$ (12,118,300,000)	$ (11,441,200,000)	$ (11,988,400,000)	(11,656,700,000)	$ (11,225,500,000)	$ (10,972,900,000)	$ (10,776,800,000)
Retained Earnings | Cumulative Effect Adjustment
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders equity	$ 10,100,000							$ 10,100,000

XML

Allowance for Credit Losses (Changes in Allowance for Credit Losses) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
LOANS AND LEASES
Balance at Beginning of Period	$ 210,200,000	$ 110,800,000	$ 104,500,000	$ 112,600,000
Charge-Offs	(800,000)	(1,100,000)	(3,000,000.0)	(2,700,000)
Recoveries	1,200,000	1,700,000	5,300,000	5,700,000
Net (Charge-Offs) Recoveries	400,000	600,000	2,300,000	3,000,000.0
Provision for Credit Losses	4,800,000	(5,700,000)	110,800,000	(9,900,000)
Balance at End of Period	215,400,000	105,700,000	215,400,000	105,700,000
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period	49,000,000.0	23,300,000	19,900,000	25,600,000
Charge-Offs	0	0	0	0
Recoveries	0	0	0	0
Net (Charge-Offs) Recoveries	0	0	0	0
Provision for Credit Losses	(4,100,000)	(1,300,000)	16,100,000	(3,600,000)
Balance at End of Period	44,900,000	22,000,000.0	44,900,000	22,000,000.0
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period	6,500,000		0
Charge-Offs	0		0
Recoveries	0		0
Net (Charge-Offs) Recoveries	0		0
Provision for Credit Losses	400,000		300,000
Balance at End of Period	6,900,000		6,900,000
OTHER FINANCIAL ASSETS
Balance at Beginning of Period	1,300,000		0
Charge-Offs	0		0
Recoveries	0		0
Net (Charge-Offs) Recoveries	0		0
Provision for Credit Losses	(600,000)		300,000
Balance at End of Period	700,000		700,000
TOTAL
Balance at Beginning of Period	267,000,000.0	134,100,000	124,400,000	138,200,000
Charge-Offs	(800,000)	(1,100,000)	(3,000,000.0)	(2,700,000)
Recoveries	1,200,000	1,700,000	5,300,000	5,700,000
Net (Charge-Offs) Recoveries			2,300,000	3,000,000.0
Provision for Credit Losses	500,000	(7,000,000.0)	127,500,000	(13,500,000)
Balance at End of Period	267,900,000	$ 127,700,000	267,900,000	$ 127,700,000
Corporate Debt
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period	500,000		0
Provision for Credit Losses	200,000		(100,000)
Balance at End of Period	700,000		700,000
TOTAL
Provision for Credit Losses	$ 0		0
Cumulative Effect Adjustment
LOANS AND LEASES
Balance at Beginning of Period			(2,200,000)
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period			8,900,000
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period			6,600,000
OTHER FINANCIAL ASSETS
Balance at Beginning of Period			400,000
TOTAL
Balance at Beginning of Period			13,700,000
Cumulative Effect Adjustment | Corporate Debt
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period			800,000
Adjusted Balance
LOANS AND LEASES
Balance at Beginning of Period			102,300,000
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period			28,800,000
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period			6,600,000
OTHER FINANCIAL ASSETS
Balance at Beginning of Period			400,000
TOTAL
Balance at Beginning of Period			138,100,000
Adjusted Balance | Corporate Debt
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period			$ 800,000

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Allowance for Credit Losses (Accrued Interest) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Receivables [Abstract]
Loans and Leases	$ 54.2	$ 84.5
Debt Securities
Held to Maturity	71.7	82.3
Available for Sale	101.0	119.0
Other Financial Assets	$ 1.7	$ 14.7

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Allowance for Credit Losses (Accrued Interest Reversed Through Income) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable accrued interest income	$ 1.1	$ 3.5
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable accrued interest income	0.5	1.5
Personal
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable accrued interest income	$ 0.6	$ 2.0

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Allowance for Credit Losses (Changes in Allowance for Credit Losses Related to Loan and Leases) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
LOANS AND LEASES
Balance at Beginning of Period	$ 210.2	$ 110.8	$ 104.5	$ 112.6
Charge-Offs	(0.8)	(1.1)	(3.0)	(2.7)
Recoveries	1.2	1.7	5.3	5.7
Net (Charge-Offs) Recoveries	0.4	0.6	2.3	3.0
Provision for Credit Losses	4.8	(5.7)	110.8	(9.9)
Balance at End of Period	215.4	105.7	215.4	105.7
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period	49.0	23.3	19.9	25.6
Charge-Offs	0.0	0.0	0.0	0.0
Recoveries	0.0	0.0	0.0	0.0
Net (Charge-Offs) Recoveries	0.0	0.0	0.0	0.0
Provision for Credit Losses	(4.1)	(1.3)	16.1	(3.6)
Balance at End of Period	44.9	22.0	44.9	22.0
COMMERCIAL
LOANS AND LEASES
Balance at Beginning of Period	162.8	59.9	58.1	57.6
Charge-Offs	0.0	0.0	(0.1)	(0.1)
Recoveries	0.2	0.0	2.2	0.7
Net (Charge-Offs) Recoveries	0.2	0.0	2.1	0.6
Provision for Credit Losses	(15.4)	(1.3)	93.3	0.4
Balance at End of Period	147.6	58.6	147.6	58.6
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period	46.1	18.5	15.8	21.1
Charge-Offs	0.0	0.0	0.0	0.0
Recoveries	0.0	0.0	0.0	0.0
Net (Charge-Offs) Recoveries	0.0	0.0	0.0	0.0
Provision for Credit Losses	(6.0)	(0.7)	12.4	(3.3)
Balance at End of Period	40.1	17.8	40.1	17.8
PERSONAL
LOANS AND LEASES
Balance at Beginning of Period	47.4	50.9	46.4	55.0
Charge-Offs	(0.8)	(1.1)	(2.9)	(2.6)
Recoveries	1.0	1.7	3.1	5.0
Net (Charge-Offs) Recoveries	0.2	0.6	0.2	2.4
Provision for Credit Losses	20.2	(4.4)	17.5	(10.3)
Balance at End of Period	67.8	47.1	67.8	47.1
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period	2.9	4.8	4.1	4.5
Charge-Offs	0.0	0.0	0.0	0.0
Recoveries	0.0	0.0	0.0	0.0
Net (Charge-Offs) Recoveries	0.0	0.0	0.0	0.0
Provision for Credit Losses	1.9	(0.6)	3.7	(0.3)
Balance at End of Period	$ 4.8	$ 4.2	4.8	$ 4.2
Cumulative Effect Adjustment
LOANS AND LEASES
Balance at Beginning of Period			(2.2)
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period			8.9
Cumulative Effect Adjustment | COMMERCIAL
LOANS AND LEASES
Balance at Beginning of Period			(5.9)
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period			11.9
Cumulative Effect Adjustment | PERSONAL
LOANS AND LEASES
Balance at Beginning of Period			3.7
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period			(3.0)
Adjusted Balance
LOANS AND LEASES
Balance at Beginning of Period			102.3
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period			28.8
Adjusted Balance | COMMERCIAL
LOANS AND LEASES
Balance at Beginning of Period			52.2
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period			27.7
Adjusted Balance | PERSONAL
LOANS AND LEASES
Balance at Beginning of Period			50.1
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT
Balance at Beginning of Period			$ 1.1

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Allowance for Credit Losses (Recorded Investments in Loans and Leases) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Loans and Leases
Evaluated on an Individual Level	$ 98.0		$ 92.2
Evaluated on a Collective Level	32,668.3		31,317.4
TOTAL LOANS AND LEASES	32,766.3		31,409.6
Allowance for Credit Losses on Credit Exposures
Evaluated on an Individual Level	6.0		5.0
Evaluated on a Collective Level	209.4		99.5
Allowance Assigned to Loans and Leases	215.4	$ 210.2	104.5	$ 105.7	$ 110.8	$ 112.6
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Level	2.2		1.9
Evaluated on a Collective Level	42.7		18.0
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	44.9	49.0	19.9	22.0	23.3	25.6
Total Allowance Assigned to Loans and Leases and Undrawn Loan Commitments and Standby Letters of Credit	260.3		124.4
COMMERCIAL
Loans and Leases
Evaluated on an Individual Level	34.1		10.4
Evaluated on a Collective Level	14,547.6		13,990.9
TOTAL LOANS AND LEASES	14,581.7
Allowance for Credit Losses on Credit Exposures
Evaluated on an Individual Level	5.6		3.4
Evaluated on a Collective Level	142.0		54.7
Allowance Assigned to Loans and Leases	147.6		58.1
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Level	2.2		1.9
Evaluated on a Collective Level	37.9		13.9
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	40.1		15.8
Total Allowance Assigned to Loans and Leases and Undrawn Loan Commitments and Standby Letters of Credit	187.7		73.9
Personal
Loans and Leases
Evaluated on an Individual Level	63.9		81.8
Evaluated on a Collective Level	18,120.7		17,326.5
TOTAL LOANS AND LEASES	18,184.6
Allowance for Credit Losses on Credit Exposures
Evaluated on an Individual Level	0.4		1.6
Evaluated on a Collective Level	67.4		44.8
Allowance Assigned to Loans and Leases	67.8		46.4
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Evaluated on an Individual Level	0.0		0.0
Evaluated on a Collective Level	4.8		4.1
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	4.8		4.1
Total Allowance Assigned to Loans and Leases and Undrawn Loan Commitments and Standby Letters of Credit	72.6		50.5
COMMERCIAL
Loans and Leases
TOTAL LOANS AND LEASES	14,581.7		14,001.3
Allowance for Credit Losses on Credit Exposures
Allowance Assigned to Loans and Leases	147.6	162.8	58.1	58.6	59.9	57.6
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	40.1	46.1	15.8	17.8	18.5	21.1
Personal
Loans and Leases
TOTAL LOANS AND LEASES	18,184.6		17,408.3
Allowance for Credit Losses on Credit Exposures
Allowance Assigned to Loans and Leases	67.8	47.4	46.4	47.1	50.9	55.0
Allowance for Undrawn Loan Commitments and Standby Letters of Credit
Allowance Assigned to Undrawn Loan Commitments and Standby Letters of Credit	$ 4.8	$ 2.9	$ 4.1	$ 4.2	$ 4.8	$ 4.5

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Allowance for Credit Losses (Changes in The Allowance for Credit Losses Related to Debt Securities Held to Maturity) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period	$ 6.5	$ 0.0
Provision for Credit Losses	0.4	0.3
Balance at End of Period	6.9	6.9
Cumulative Effect Adjustment
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		6.6
Adjusted Balance
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		6.6
CORPORATE DEBT
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period	0.5	0.0
Provision for Credit Losses	0.2	(0.1)
Balance at End of Period	0.7	0.7
CORPORATE DEBT | Cumulative Effect Adjustment
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		0.8
CORPORATE DEBT | Adjusted Balance
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		0.8
Non-U.S. Government
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period	0.4	0.0
Provision for Credit Losses	0.0	0.1
Balance at End of Period	0.4	0.4
Non-U.S. Government | Cumulative Effect Adjustment
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		0.3
Non-U.S. Government | Adjusted Balance
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		0.3
SUB-SOVEREIGN, SUPERNATIONAL, AND NON-U.S. AGENCY BONDS
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period	0.7	0.0
Provision for Credit Losses	(0.1)	(0.3)
Balance at End of Period	0.6	0.6
SUB-SOVEREIGN, SUPERNATIONAL, AND NON-U.S. AGENCY BONDS | Cumulative Effect Adjustment
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		0.9
SUB-SOVEREIGN, SUPERNATIONAL, AND NON-U.S. AGENCY BONDS | Adjusted Balance
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		0.9
CERTIFICATE OF DEPOSITS
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period	0.0	0.0
Provision for Credit Losses	0.2	0.2
Balance at End of Period	0.2	0.2
CERTIFICATE OF DEPOSITS | Cumulative Effect Adjustment
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		0.0
CERTIFICATE OF DEPOSITS | Adjusted Balance
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		0.0
COVERED BONDS
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period	0.0	0.0
Provision for Credit Losses	0.1	0.1
Balance at End of Period	0.1	0.1
COVERED BONDS | Cumulative Effect Adjustment
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		0.0
COVERED BONDS | Adjusted Balance
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		0.0
OTHER
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period	4.9	0.0
Provision for Credit Losses	0.0	0.3
Balance at End of Period	$ 4.9	4.9
OTHER | Cumulative Effect Adjustment
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		4.6
OTHER | Adjusted Balance
DEBT SECURITIES HELD TO MATURITY
Balance at Beginning of Period		$ 4.6

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Pledged Assets (Type of Pledged Assets) (Details) - USD ($) $ in Billions	Sep. 30, 2020	Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total Pledged Assets	$ 43.4	$ 42.1
Obligations of States and Political Subdivisions
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total Pledged Assets	1.6	1.0
Government Sponsored Agency and Other Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total Pledged Assets	30.0	33.4
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Total Pledged Assets	$ 11.8	$ 7.7

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Pledged Assets (Narrative) (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security owned and pledged as collateral, fair value		$ 43,400,000,000		$ 42,100,000,000
Securities eligible to be repledged or sold		268,600,000		487,200,000
Collateral securities repledged, delivered, or used		0		0
Average deposits maintained to meet Federal Reserve Bank reserve requirements	$ 1,600,000,000	500,000,000	$ 1,500,000,000
Collateral Requirements
Financial Instruments Owned and Pledged as Collateral [Line Items]
Security owned and pledged as collateral, fair value		$ 7,600,000,000		$ 8,500,000,000

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Pledged Assets (Fair Value Of Available For Sale Debt Securities Included In Pledged Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]
Debt Securities Available for Sale	$ 43,400.0	$ 42,100.0
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE
Financial Instruments Owned and Pledged as Collateral [Line Items]
Debt Securities Available for Sale	268.6	487.1
DERIVATIVE CONTRACTS
Financial Instruments Owned and Pledged as Collateral [Line Items]
Debt Securities Available for Sale	$ 30.0	$ 14.4

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Pledged Assets (Accepted Collateral) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fair value of accepted collateral	$ 1,533.4	$ 707.8
Derivative contracts
Financial Instruments Owned and Pledged as Collateral [Line Items]
Fair value of accepted collateral	$ 30.6	$ 16.8

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Goodwill and Other Intangibles (Goodwill by Reporting Segment) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 696.8
Foreign Exchange Rates	1.2
Goodwill, Ending Balance	698.0
CORPORATE & INSTITUTIONAL SERVICES
Goodwill [Roll Forward]
Goodwill, Beginning Balance	625.7
Foreign Exchange Rates	1.2
Goodwill, Ending Balance	626.9
WEALTH MANAGEMENT
Goodwill [Roll Forward]
Goodwill, Beginning Balance	71.1
Foreign Exchange Rates	0.0
Goodwill, Ending Balance	$ 71.1

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Goodwill and Other Intangibles (Other Intangible Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Gross Carrying Amount	$ 214.3	$ 207.2
Less: Accumulated Amortization	101.7	86.6
Net Book Value	$ 112.6	$ 120.6

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Goodwill and Other Intangibles (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense related to other intangible assets			$ 12.6	$ 12.5
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense related to other intangible assets	$ 4.3	$ 4.2	12.6	$ 12.5
Estimated future amortization expense for 2020	4.3		4.3
Estimated future amortization expense for 2021	14.7		14.7
Estimated future amortization expense for 2022	10.1		10.1
Estimated future amortization expense for 2023	9.8		9.8
Estimated future amortization expense for 2024	$ 9.7		$ 9.7

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Reporting Segments (Results of Reporting Segments) (Details) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reporting segments | segment							2
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 1,003.8			$ 975.5			$ 2,968.9	$ 2,859.9
Foreign Exchange Trading Income	61.6			59.7			221.8	186.4
Other Noninterest Income	91.1			85.0			279.4	222.0
Total Noninterest Income	1,156.5			1,120.2			3,470.1	3,268.3
Net Interest Income	336.5			425.3			1,132.5	1,280.2
Revenue	1,493.0			1,545.5			4,602.6	4,548.5
Provision for Credit Losses	0.5			(7.0)			127.5	(13.5)
Noninterest Expense	1,094.7			1,036.3			3,197.2	3,071.2
Income before Income Taxes	397.8			516.2			1,277.9	1,490.8
Provision for Income Taxes	103.3			131.6			309.5	369.7
Net Income	$ 294.5	$ 313.3	$ 360.6	$ 384.6	$ 389.4	$ 347.1	$ 968.4	$ 1,121.1
Percentage of Consolidated Net Income	100.00%			100.00%			100.00%	100.00%
Average Assets	$ 140,925.4			$ 116,352.1			$ 134,645.2	$ 117,364.7
FTE adjustments	7.9			7.6			23.7	23.1
CORPORATE & INSTITUTIONAL SERVICES
Noninterest Income
Trust, Investment and Other Servicing Fees	584.9			559.9			1,725.5	1,644.5
Foreign Exchange Trading Income	58.4			55.5			211.8	172.5
Other Noninterest Income	56.7			53.6			167.5	141.8
Total Noninterest Income	700.0			669.0			2,104.8	1,958.8
Net Interest Income	139.9			229.9			516.6	694.3
Revenue	839.9			898.9			2,621.4	2,653.1
Provision for Credit Losses	(19.2)			4.8			35.3	1.3
Noninterest Expense	707.3			649.2			2,022.2	1,930.5
Income before Income Taxes	151.8			244.9			563.9	721.3
Provision for Income Taxes	38.7			59.9			129.9	171.8
Net Income	$ 113.1			$ 185.0			$ 434.0	$ 549.5
Percentage of Consolidated Net Income	39.00%			48.00%			45.00%	49.00%
Average Assets	$ 108,823.0			$ 85,982.2			$ 102,902.3	$ 87,664.1
WEALTH MANAGEMENT
Noninterest Income
Trust, Investment and Other Servicing Fees	418.9			415.6			1,243.4	1,215.4
Foreign Exchange Trading Income	3.2			4.2			10.0	13.9
Other Noninterest Income	39.7			38.1			122.9	95.1
Total Noninterest Income	461.8			457.9			1,376.3	1,324.4
Net Interest Income	196.6			195.4			615.9	585.9
Revenue	658.4			653.3			1,992.2	1,910.3
Provision for Credit Losses	19.7			(11.8)			92.2	(14.8)
Noninterest Expense	386.3			385.9			1,152.7	1,137.9
Income before Income Taxes	252.4			279.2			747.3	787.2
Provision for Income Taxes	66.2			73.6			187.9	202.3
Net Income	$ 186.2			$ 205.6			$ 559.4	$ 584.9
Percentage of Consolidated Net Income	63.00%			54.00%			58.00%	52.00%
Average Assets	$ 32,102.4			$ 30,369.9			$ 31,742.9	$ 29,700.6
TREASURY AND OTHER
Noninterest Income
Trust, Investment and Other Servicing Fees	0.0			0.0			0.0	0.0
Foreign Exchange Trading Income	0.0			0.0			0.0	0.0
Other Noninterest Income	(5.3)			(6.7)			(11.0)	(14.9)
Total Noninterest Income	(5.3)			(6.7)			(11.0)	(14.9)
Net Interest Income	0.0			0.0			0.0	0.0
Revenue	(5.3)			(6.7)			(11.0)	(14.9)
Provision for Credit Losses	0.0			0.0			0.0	0.0
Noninterest Expense	1.1			1.2			22.3	2.8
Income before Income Taxes	(6.4)			(7.9)			(33.3)	(17.7)
Provision for Income Taxes	(1.6)			(1.9)			(8.3)	(4.4)
Net Income	$ (4.8)			$ (6.0)			$ (25.0)	$ (13.3)
Percentage of Consolidated Net Income	(2.00%)			(2.00%)			(3.00%)	(1.00%)
Average Assets	$ 0.0			$ 0.0			$ 0.0	$ 0.0

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Stockholders' Equity (Narrative) (Details) - USD ($)			3 Months Ended						9 Months Ended
	Jul. 21, 2020	Apr. 21, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2018
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)			10,000,000						10,000,000	10,000,000
Stockholders' equity			$ 11,579,100,000	$ 11,382,200,000	$ 10,879,700,000	$ 10,811,300,000	$ 10,805,500,000	$ 10,616,200,000	$ 11,579,100,000	$ 11,091,000,000.0	$ 10,508,300,000
Common stock dividends (in usd per share)			$ 0.70	$ 0.70	$ 0.70	$ 0.70	$ 0.60	$ 0.60
Stock repurchase, share-based compensation plan (in shares)			18,534						518,745
Stock repurchase, aggregate cost			$ 1,500,000	$ 200,000	$ 296,800,000	$ 307,200,000	$ 271,200,000	$ 257,400,000	$ 298,500,000
Average price paid per share for common stock repurchased (in usd per share)			$ 81.02						$ 91.49
Stock repurchase, shares (in shares)									3,262,621
Stock repurchase program, number of shares authorized to be repurchased (in shares)												25,000,000.0
Series D Preferred Stock
Class of Stock [Line Items]
Preferred stock, outstanding (in shares)			5,000						5,000	5,000
Stockholders' equity			$ 493,500,000						$ 493,500,000	$ 493,500,000
Preferred stock, liquidation preference			$ 100,000						$ 100,000
Depository shares, liquidation preference per share (in dollars per share)			$ 1,000						$ 1,000
Preferred stock, annual dividend rate									4.60%
Preferred stock, dividend payment rate, variable rate									3.202%
Common stock dividends (in usd per share)	$ 2,300
Series E Preferred Stock
Class of Stock [Line Items]
Preferred stock, outstanding (in shares)			16,000						16,000	16,000
Percentage of ownership interest per each depository shares			0.10%						0.10%
Stockholders' equity			$ 391,400,000						$ 391,400,000	$ 391,400,000
Preferred stock, without par value (in dollars per share)			$ 0						$ 0
Preferred stock, liquidation preference			$ 25,000						$ 25,000
Depository shares, liquidation preference per share (in dollars per share)			$ 25						$ 25
Preferred stock, annual dividend rate									4.70%
Common stock dividends (in usd per share)		$ 293.75
Series D Preferred Stock, Depositary Shares
Class of Stock [Line Items]
Preferred stock, outstanding (in shares)			500,000						500,000
Preferred stock, shares issued (in shares)			500,000						500,000
Percentage of ownership interest per each depository shares			1.00%						1.00%
Series E Preferred Stock Depositary Shares
Class of Stock [Line Items]
Preferred stock, outstanding (in shares)			16,000,000						16,000,000
Preferred stock, shares issued (in shares)			16,000,000						16,000,000

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Accumulated Other Comprehensive Income (Loss) (Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 11,382.2	$ 10,879.7	$ 11,091.0	$ 10,805.5	$ 10,616.2	$ 10,508.3	$ 11,091.0	$ 10,508.3
Net Change	54.1	325.4	239.7	68.8	185.5	108.4	619.2	362.7
Ending balance	11,579.1	11,382.2	10,879.7	10,811.3	10,805.5	10,616.2	11,579.1	10,811.3
TOTAL
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	370.4	45.0	(194.7)	(159.8)	(345.3)	(453.7)	(194.7)	(453.7)
Net Change	54.1	325.4	239.7	68.8	185.5	108.4
Ending balance	424.5	370.4	45.0	(91.0)	(159.8)	(345.3)	424.5	(91.0)
NET UNREALIZED GAINS (LOSSES) ON DEBT SECURITIES AVAILABLE FOR SALE
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	631.8		114.0	133.1		(114.9)	114.0	(114.9)
Net Change	33.5			57.0			551.3	305.0
Ending balance	665.3	631.8		190.1	133.1		665.3	190.1
NET UNREALIZED (LOSSES) GAINS ON CASH FLOW HEDGES
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	0.3		(3.7)	4.5		4.0	(3.7)	4.0
Net Change	1.3			(2.4)			5.3	(1.9)
Ending balance	1.6	0.3		2.1	4.5		1.6	2.1
NET FOREIGN CURRENCY ADJUSTMENT
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	145.5		117.8	96.8		67.9	117.8	67.9
Net Change	1.8			9.9			29.5	38.8
Ending balance	147.3	145.5		106.7	96.8		147.3	106.7
NET PENSION AND OTHER POSTRETIREMENT BENEFIT ADJUSTMENTS
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(407.2)		$ (422.8)	(394.2)		$ (410.7)	(422.8)	(410.7)
Net Change	17.5			4.3			33.1	20.8
Ending balance	$ (389.7)	$ (407.2)		$ (389.9)	$ (394.2)		$ (389.7)	$ (389.9)

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Accumulated Other Comprehensive Income (Loss) (Details of Changes In Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
BEFORE TAX
Net Change	$ 46.1			$ 113.2			$ 811.7	$ 508.4
TAX EFFECT
Net Change	8.0			(44.4)			(192.5)	(145.7)
AFTER TAX
Net Change	54.1	$ 325.4	$ 239.7	68.8	$ 185.5	$ 108.4	619.2	362.7
Unrealized Gains (Losses) on Debt Securities Available for Sale
BEFORE TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale	45.3			76.1			736.8	409.0
Reclassification Adjustment for (Gains) Losses Included in Net Income	0.0			0.3			(0.1)	0.6
Net Change	45.3			76.4			736.7	409.6
TAX EFFECT
Unrealized Gains (Losses) on Debt Securities Available for Sale	(11.8)			(19.4)			(185.4)	(104.6)
Reclassification Adjustment for (Gains) Losses Included in Net Income	0.0			0.0			0.0	0.0
Net Change	(11.8)			(19.4)			(185.4)	(104.6)
AFTER TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale	33.5			56.7			551.4	304.4
Reclassification Adjustment for (Gains) Losses Included in Net Income	0.0			0.3			(0.1)	0.6
Net Change	33.5			57.0			551.3	305.0
Unrealized Gains (Losses) on Cash Flow Hedges
BEFORE TAX
Reclassification Adjustment for (Gains) Losses Included in Net Income	(4.7)			(4.0)			(11.2)	(21.4)
Net Change	1.7			(3.2)			7.1	(2.6)
TAX EFFECT
Reclassification Adjustment for (Gains) Losses Included in Net Income	1.2			1.0			2.8	5.3
Net Change	(0.4)			0.8			(1.8)	0.7
AFTER TAX
Reclassification Adjustment for (Gains) Losses Included in Net Income	(3.5)			(3.0)			(8.4)	(16.1)
Net Change	1.3			(2.4)			5.3	(1.9)
Foreign Currency Adjustments
BEFORE TAX
Net Change	(24.1)			34.4			24.0	73.4
TAX EFFECT
Net Change	25.9			(24.5)			5.5	(34.6)
AFTER TAX
Net Change	1.8			9.9			29.5	38.8
Foreign Currency Translation Adjustments
BEFORE TAX
Net Change	92.1			(71.9)			53.1	(69.4)
TAX EFFECT
Net Change	(3.1)			2.0			(1.0)	3.3
AFTER TAX
Net Change	89.0			(69.9)			52.1	(66.1)
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)
BEFORE TAX
Net Change	1.2			(1.3)			0.7	(1.3)
TAX EFFECT
Net Change	(0.3)			0.3			(0.2)	0.3
AFTER TAX
Net Change	0.9			(1.0)			0.5	(1.0)
Net Investment Hedge Gains (Losses)
BEFORE TAX
Net Change	(117.4)			107.6			(29.8)	144.1
TAX EFFECT
Net Change	29.3			(26.8)			6.7	(38.2)
AFTER TAX
Net Change	(88.1)			80.8			(23.1)	105.9
Pension and Other Postretirement Benefit Adjustments
BEFORE TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale	12.6			0.0			11.8	11.4
Net Change	23.2			5.6			43.9	28.0
TAX EFFECT
Unrealized Gains (Losses) on Debt Securities Available for Sale	(3.1)			0.0			(3.0)	(3.1)
Net Change	(5.7)			(1.3)			(10.8)	(7.2)
AFTER TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale	9.5			0.0			8.8	8.3
Net Change	17.5			4.3			33.1	20.8
Amortization of Net Actuarial Loss
BEFORE TAX
Reclassification Adjustment for (Gains) Losses Included in Net Income	10.7			5.7			32.3	16.8
TAX EFFECT
Reclassification Adjustment for (Gains) Losses Included in Net Income	(2.6)			(1.3)			(7.8)	(4.1)
AFTER TAX
Reclassification Adjustment for (Gains) Losses Included in Net Income	8.1			4.4			24.5	12.7
Amortization of Prior Service Cost
BEFORE TAX
Reclassification Adjustment for (Gains) Losses Included in Net Income	(0.1)			(0.1)			(0.2)	(0.2)
TAX EFFECT
Reclassification Adjustment for (Gains) Losses Included in Net Income	0.0			0.0			0.0	0.0
AFTER TAX
Reclassification Adjustment for (Gains) Losses Included in Net Income	(0.1)			(0.1)			(0.2)	(0.2)
Foreign Exchange Contracts | Unrealized Gains (Losses) on Cash Flow Hedges
BEFORE TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale	6.6			0.7			18.1	17.4
TAX EFFECT
Unrealized Gains (Losses) on Debt Securities Available for Sale	(1.6)			(0.2)			(4.5)	(4.3)
AFTER TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale	5.0			0.5			13.6	13.1
Interest Rate Contracts | Unrealized Gains (Losses) on Cash Flow Hedges
BEFORE TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale	(0.2)			0.1			0.2	1.4
TAX EFFECT
Unrealized Gains (Losses) on Debt Securities Available for Sale	0.0			0.0			(0.1)	(0.3)
AFTER TAX
Unrealized Gains (Losses) on Debt Securities Available for Sale	$ (0.2)			$ 0.1			$ 0.1	$ 1.1

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Net Income Per Common Share Computations (Net Income Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding (in shares)	208,106,190			213,176,809			208,351,088	215,832,347
Net Income	$ 294.5	$ 313.3	$ 360.6	$ 384.6	$ 389.4	$ 347.1	$ 968.4	$ 1,121.1
Less: Dividends on Preferred Stock	16.2			17.4			51.5	40.6
Net Income Applicable to Common Stock	278.3			367.2			916.9	1,080.5
Less: Earnings Allocated to Participating Securities	3.3			4.5			10.6	12.6
Earnings Allocated to Common Shares Outstanding	$ 275.0			$ 362.7			$ 906.3	$ 1,067.9
Basic Net Income Per Common Share (in dollars per share)	$ 1.32			$ 1.70			$ 4.35	$ 4.95
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding (in shares)	208,106,190			213,176,809			208,351,088	215,832,347
Plus: Dilutive Effect of Share-based Compensation (in shares)	582,304			1,029,767			672,243	1,031,216
Diluted (in shares)	208,688,494			214,206,576			209,023,331	216,863,563
Earnings Allocated to Common and Potential Common Shares	$ 275.0			$ 362.7			$ 906.3	$ 1,067.9
Diluted Net Income Per Common Share (in dollars per share)	$ 1.32			$ 1.69			$ 4.34	$ 4.92
Common stock equivalents not included in the computation of diluted earnings per share because their inclusion would have been antidilutive (in shares)	0			0			0	0

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Revenue from Contracts with Clients (Revenue Disaggregation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from contract with client	$ 1,003.8	$ 975.5	$ 2,968.9	$ 2,859.9
Foreign Exchange Trading Income	61.6	59.7	221.8	186.4
Treasury Management Fees	11.6	11.2	34.0	34.1
Security Commissions and Trading Income	26.0	29.1	100.9	75.8
Other Operating Income	53.5	45.1	144.4	113.0
Investment Security Gains (Losses), net	0.0	(0.4)	0.1	(0.9)
Total Other Noninterest Income	152.7	144.7	501.2	408.4
Total Noninterest Income	1,156.5	1,120.2	3,470.1	3,268.3
Custody and Fund Administration
Disaggregation of Revenue [Line Items]
Revenue from contract with client	416.4	414.8	1,231.7	1,219.7
Investment Management and Advisory
Disaggregation of Revenue [Line Items]
Revenue from contract with client	519.3	491.4	1,515.2	1,428.7
Securities Lending
Disaggregation of Revenue [Line Items]
Revenue from contract with client	19.8	20.1	70.7	64.9
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with client	$ 48.3	$ 49.2	$ 151.3	$ 146.6

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Revenue from Contracts with Clients (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue from contract with client	$ 1,003.8	$ 975.5	$ 2,968.9	$ 2,859.9
Security commissions and trading income	26.0	29.1	100.9	75.8
Other operating income	53.5	45.1	144.4	113.0
Securities Commissions and Trading Income
Disaggregation of Revenue [Line Items]
Revenue from contract with client	21.8	23.5	76.9	64.3
Other Operating Income
Disaggregation of Revenue [Line Items]
Revenue from contract with client	$ 10.8	$ 10.5	$ 31.6	$ 30.9

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Revenue from Contracts with Clients (Contract Receivables) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total Client Receivables	$ 918.9	$ 903.0
Trust Fees Receivable, net
Disaggregation of Revenue [Line Items]
Total Client Receivables	805.7	801.9
Contract with customer, asset, allowance for credit loss	7.3	5.6
Other
Disaggregation of Revenue [Line Items]
Total Client Receivables	$ 113.2	$ 101.1

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Net Interest Income (Net Interest Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest Income
Loans and Leases	$ 167.1	$ 291.0	$ 606.4	$ 889.8
Securities — Taxable	182.6	265.9	632.1	812.4
Securities - Non-Taxable	0.3	0.9	1.1	3.1
Interest-Bearing Due from and Deposits with Banks	2.7	18.6	20.0	55.7
Federal Reserve and Other Central Bank Deposits and Other	2.7	44.4	31.3	162.8
Total Interest Income	355.4	620.8	1,290.9	1,923.8
Interest Expense
Deposits	(3.5)	122.0	56.7	403.5
Federal Funds Purchased	0.1	2.4	2.1	22.8
Securities Sold Under Agreements to Repurchase	0.0	1.6	1.0	5.4
Other Borrowings	5.0	46.0	40.6	145.2
Senior Notes	19.1	19.6	57.0	54.0
Long-Term Debt	5.7	9.4	21.1	29.4
Floating Rate Capital Debt	0.4	2.1	3.6	6.4
Total Interest Expense	26.8	203.1	182.1	666.7
Net Interest Income	$ 328.6	$ 417.7	$ 1,108.8	$ 1,257.1

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Pension and Postretirement Health Care (Net Periodic Pension Expense (Benefit)) (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Aug. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Amortization
Defined benefit plan, benefit obligation, increase (decrease) for plan amendment	$ 12,600,000
Defined benefit plan, benefit obligation, increase (decrease) for amortization period adjustment	$ 300,000	$ (97,500,000)	$ (87,600,000)	$ (285,800,000)	$ (262,600,000)
Pension Plan
Amortization
Contribution to pension plan				0	0
Supplemental Plan
Defined Benefit plan Net periodic benefit cost
Service Cost		1,200,000	1,100,000	3,400,000	3,100,000
Interest Cost		1,200,000	1,500,000	3,600,000	4,400,000
Amortization
Net Actuarial Loss (Gain)		1,700,000	1,400,000	5,300,000	4,200,000
Prior Service Cost		0	0	100,000	100,000
Net Periodic Pension Expense		4,100,000	4,000,000.0	12,400,000	11,800,000
Postretirement Health Care Plan
Defined Benefit plan Net periodic benefit cost
Interest Cost		200,000	300,000	600,000	900,000
Amortization
Net Actuarial Loss (Gain)		(100,000)	(200,000)	(500,000)	(800,000)
Prior Service Cost		(100,000)	0	(100,000)	0
Net Periodic Pension Expense		0	100,000	0	100,000
U.S Plans | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost		11,900,000	10,400,000	35,500,000	31,200,000
Interest Cost		10,800,000	11,800,000	32,400,000	35,400,000
Expected Return on Plan Assets		(19,200,000)	(21,700,000)	(57,600,000)	(65,100,000)
Amortization
Net Actuarial Loss (Gain)		8,800,000	4,300,000	26,400,000	12,900,000
Prior Service Cost		(100,000)	(100,000)	(300,000)	(300,000)
Net Periodic Pension Expense		12,200,000	4,700,000	36,400,000	14,100,000
Non U.S. Plans | Pension Plan
Defined Benefit plan Net periodic benefit cost
Service Cost		600,000	500,000	1,600,000	1,500,000
Interest Cost		700,000	900,000	2,100,000	2,900,000
Expected Return on Plan Assets		(800,000)	(1,000,000.0)	(2,300,000)	(2,900,000)
Settlement Expense		100,000	0	300,000	0
Amortization
Net Actuarial Loss (Gain)		200,000	200,000	800,000	500,000
Prior Service Cost		100,000	0	100,000	0
Net Periodic Pension Expense		$ 900,000	$ 600,000	$ 2,600,000	$ 2,000,000.0

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Share-Based Compensation Plans (Compensation Expense for Share-Based Arrangements and Tax Impacts) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 13.9	$ 17.3	$ 82.8	$ 91.3
Tax Benefits Recognized	3.5	4.3	20.6	22.7
Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	12.2	14.0	66.3	68.5
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	0.1	0.4	0.4	1.1
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1.6	$ 2.9	$ 16.1	$ 21.7

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Variable Interest Entities (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Variable Interest Entity [Line Items]
Exposure to loss from liquidity arrangements and obligations to purchase assets	$ 0		$ 0
Assets	152,082,000,000.0		152,082,000,000.0		$ 136,828,400,000
Liabilities	140,502,900,000		140,502,900,000		125,737,400,000
Affordable housing tax credits and other tax benefits	20,700,000	$ 16,400,000	59,400,000	$ 49,200,000
Contractual obligation to provide financial support	0		0
Fair value, investments, entities that calculate net asset value per share, unfunded commitments	73,300,000		73,300,000		0
Leveraged Leasing Transactions
Variable Interest Entity [Line Items]
Exposure to loss from liquidity arrangements and obligations to purchase assets	0		0
Leveraged Leasing Transactions | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	$ 30,100,000		$ 30,100,000		42,600,000
Leveraged Leasing Transactions | Lower Limit
Variable Interest Entity [Line Items]
Funding of assets cost via equity interest	20.00%		20.00%
Funding of asset's cost via third party non recourse debt holders	70.00%		70.00%
Leveraged Leasing Transactions | Upper Limit
Variable Interest Entity [Line Items]
Funding of assets cost via equity interest	30.00%		30.00%
Funding of asset's cost via third party non recourse debt holders	80.00%		80.00%
Other Assets
Variable Interest Entity [Line Items]
Investments in community development projects, carrying amount, assets	$ 761,300,000		$ 761,300,000		749,300,000
Alternative investment	1,700,000		1,700,000		112,000,000.0
Other Assets | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	715,500,000		715,500,000		700,300,000
Other Liabilities
Variable Interest Entity [Line Items]
Investments in community development projects, carrying amount, liabilities	300,000,000.0		300,000,000.0		376,200,000
Other Liabilities | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Liabilities	$ 283,500,000		$ 283,500,000		$ 354,300,000

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Contingent Liabilities (Narrative) (Details) shares in Millions			1 Months Ended		3 Months Ended
	Sep. 27, 2019 USD ($)	Jun. 28, 2018 USD ($)	Jun. 30, 2016 USD ($) shares	Jun. 30, 2015 USD ($) shares	Mar. 31, 2016 trust	Sep. 30, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares
Loss Contingencies [Line Items]
Commitments and letters of credit						$ 26,400,000,000	$ 24,400,000,000
Standby letters of credit outstanding						$ 2,100,000,000	$ 2,400,000,000
Minimum securities lending related collateral percentage						100.00%
Loss contingency accrual						$ 0
Visa Class B
Loss Contingencies [Line Items]
Visa redemption gain			$ 123,100,000	$ 99,900,000
Shares issued (in shares) | shares			1.1	1.0
Common stock shares held (in shares) | shares						4.1	4.1
Remaining Visa shares held by Northern Trust, original cost basis						$ 0	$ 0
Northern Trust Fiduciary Services (Guernsey) Limited | Subsidiaries
Loss Contingencies [Line Items]
Number of administrated trusts serving as trustee on | trust					2
Lower Limit
Loss Contingencies [Line Items]
Possible loss in future periods in excess of accrual						0
Upper Limit
Loss Contingencies [Line Items]
Possible loss in future periods in excess of accrual						15,000,000
Visa Inc. | Visa Class B Litigation Case
Loss Contingencies [Line Items]
Escrow deposit	$ 300,000,000	$ 600,000,000
Indemnification Agreement
Loss Contingencies [Line Items]
Collateralized securities loaned, subject to indemnification						148,300,000,000	138,100,000,000
Credit loss liability						$ 0	$ 0

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Derivative Financial Instruments (Notional and Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
NOTIONAL VALUE	$ 281,329.7	$ 310,600.7
Assets	2,098.0	2,844.0
Total Gross Derivatives, asset	2,613.2	3,387.7
Less: Netting	1,408.3	2,338.0
Derivative Assets	1,204.9	1,049.7
Liabilities	2,143.8	2,312.4
Derivative Liabilities	2,500.8	3,313.0
Less: Netting	1,603.3	1,618.4
Derivative Liabilities	897.5	1,694.6
Derivatives Designated as Hedging under GAAP
Derivative [Line Items]
NOTIONAL VALUE	14,555.8	9,273.5
Assets	45.3	102.7
Liabilities	131.1	44.5
Fair Value Hedges | Derivatives Designated as Hedging under GAAP | Interest Rate Contracts
Derivative [Line Items]
NOTIONAL VALUE	5,357.8	4,538.2
Assets	10.2	20.3
Liabilities	18.9	20.9
Fair Value Hedges | Derivatives Not Designated as Hedging under GAAP
Derivative [Line Items]
NOTIONAL VALUE	266,773.9	301,327.2
Assets	2,567.9	3,285.0
Liabilities	2,369.7	3,268.5
Fair Value Hedges | Non-Designated Risk Management Derivatives
Derivative [Line Items]
NOTIONAL VALUE	760.7	816.8
Assets	2.0	0.9
Liabilities	32.9	34.1
Fair Value Hedges | Non-Designated Risk Management Derivatives | Foreign Exchange Contracts
Derivative [Line Items]
NOTIONAL VALUE	79.2	176.5
Assets	2.0	0.9
Liabilities	0.6	0.7
Fair Value Hedges | Non-Designated Risk Management Derivatives | Other Financial Derivatives
Derivative [Line Items]
NOTIONAL VALUE	681.5	640.3
Assets	0.0	0.0
Liabilities	32.3	33.4
Fair Value Hedges | Client-Related and Trading Derivatives
Derivative [Line Items]
NOTIONAL VALUE	266,013.2	300,510.4
Assets	2,565.9	3,284.1
Liabilities	2,336.8	3,234.4
Fair Value Hedges | Client-Related and Trading Derivatives | Foreign Exchange Contracts
Derivative [Line Items]
NOTIONAL VALUE	255,799.4	291,533.6
Assets	2,242.7	3,151.7
Liabilities	2,213.5	3,158.1
Fair Value Hedges | Client-Related and Trading Derivatives | Interest Rate Contracts
Derivative [Line Items]
NOTIONAL VALUE	10,213.8	8,976.8
Assets	323.2	132.4
Liabilities	123.3	76.3
Cash Flow Hedges | Derivatives Designated as Hedging under GAAP | Foreign Exchange Contracts
Derivative [Line Items]
NOTIONAL VALUE	5,882.7	1,661.5
Assets	14.0	8.5
Liabilities	28.9	11.5
Cash Flow Hedges | Derivatives Designated as Hedging under GAAP | Interest Rate Contracts
Derivative [Line Items]
NOTIONAL VALUE	150.0	200.0
Assets	0.3	0.2
Liabilities	0.0	0.2
Net Investment Hedges | Derivatives Designated as Hedging under GAAP | Foreign Exchange Contracts
Derivative [Line Items]
NOTIONAL VALUE	3,165.3	2,873.8
Assets	20.8	73.7
Liabilities	$ 83.3	$ 11.9

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Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative [Line Items]
Gains or losses reclassified into earnings	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Maximum length of time over which exposure was being hedged			23 months
Net investment gains (losses) recognized in AOCI	$ 117.4	$ (107.6)	$ 29.8	$ (144.1)
Foreign Currency Denominate
Derivative [Line Items]
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges			(0.9)
Foreign Currency Denominated Debt Securities
Derivative [Line Items]
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges			16.3
SECURITIES SOLD UNDER AGREEMENTS TO REPURCHASE
Derivative [Line Items]
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges			$ 0.3

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Derivative Financial Instruments (Location and Amount of Fair Value And Cash Flow Hedge Derivative Gains And Losses Recorded In Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income	$ 355.4	$ 620.8	$ 1,290.9	$ 1,923.8
Interest Expense	26.8	203.1	182.1	666.7
Other Operating Income	53.5	45.1	144.4	113.0
INTEREST INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized on fair value hedges	(14.2)	2.8	(11.6)	13.3
Gains (Losses) on cash flow hedges recognized on	4.4	2.6	11.1	20.3
INTEREST EXPENSE
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized on fair value hedges	(2.5)	(6.0)	6.1	(3.9)
Gains (Losses) on cash flow hedges recognized on	0.0	0.0	0.0	0.0
OTHER OPERATING INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Total gains (losses) recognized on fair value hedges	0.0	0.0	0.0	0.0
Gains (Losses) on cash flow hedges recognized on	0.3	1.4	0.1	1.1
Interest Rate Contracts | INTEREST INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	15.1	(14.9)	(75.6)	(99.0)
Recognized on hedged items	(15.1)	14.9	75.6	99.0
Amounts related to interest settlements on derivatives	(14.2)	2.8	(11.6)	13.3
Gains (Losses) on cash flow hedges recognized on	0.2	(0.1)	0.3	(0.5)
Interest Rate Contracts | INTEREST EXPENSE
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	(2.9)	51.4	152.1	141.6
Recognized on hedged items	2.9	(51.4)	(152.1)	(141.6)
Amounts related to interest settlements on derivatives	(2.5)	(6.0)	6.1	(3.9)
Gains (Losses) on cash flow hedges recognized on	0.0	0.0	0.0	0.0
Interest Rate Contracts | OTHER OPERATING INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Recognized on derivatives	0.0	0.0	0.0	0.0
Recognized on hedged items	0.0	0.0	0.0	0.0
Amounts related to interest settlements on derivatives	0.0	0.0	0.0	0.0
Gains (Losses) on cash flow hedges recognized on	0.0	0.0	0.0	0.0
Foreign Exchange Contracts | INTEREST INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on cash flow hedges recognized on	4.2	2.7	10.8	20.8
Foreign Exchange Contracts | INTEREST EXPENSE
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on cash flow hedges recognized on	0.0	0.0	0.0	0.0
Foreign Exchange Contracts | OTHER OPERATING INCOME
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) on cash flow hedges recognized on	$ 0.3	$ 1.4	$ 0.1	$ 1.1

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Derivative Financial Instruments (Hedged Items In Fair Value Hedges) (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Carrying value of the hedged items, available for sale debt securities	$ 2,826,200,000	$ 2,981,000,000.0
Cumulative hedge accounting basis adjustment, available for sale debt securities	63,300,000	3,300,000
Carrying value of the hedged items, senior notes and long-term subordinated debt	2,745,000,000.0	1,748,500,000
Cumulative hedge accounting basis adjustment, senior notes and long-term subordinated debt	261,800,000	126,900,000
CARRYING VALUE OF THE HEDGED ITEMS	5,571,200,000	4,729,500,000
Cumulative Hedge Accounting Basis Adjustment	325,100,000	130,200,000
Hedged asset fair value hedge discontinued cumulative increase decrease	6,700,000	1,500,000
Hedged liability fair value hedge discontinued cumulative increase decrease	$ 0	$ 0

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Derivative Financial Instruments (Location and Amount of Gains and Losses Recorded in Income for Derivatives Not Designated As Hedging Under GAAP) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Derivatives Not Designated as Hedging under GAAP
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME	$ 62.8	$ 56.4	$ 233.1	$ 176.1
Non-Designated Risk Management Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME	(1.1)	(8.2)	(7.2)	(19.5)
Non-Designated Risk Management Derivatives | Foreign Exchange Contracts | Others Operating Income
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME	4.2	(1.8)	3.8	(1.7)
Non-Designated Risk Management Derivatives | Other Financial Derivatives | Others Operating Income
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME	(5.3)	(6.4)	(11.0)	(17.8)
Client-Related and Trading Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME	63.9	64.6	240.3	195.6
Client-Related and Trading Derivatives | Foreign Exchange Contracts | Foreign Exchange Trading Income
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME	61.6	59.7	221.8	186.4
Client-Related and Trading Derivatives | Interest Rate Contracts | Security Commissions and Trading Income
Derivative Instruments, Gain (Loss) [Line Items]
AMOUNT OF DERIVATIVE GAINS (LOSSES) RECOGNIZED IN INCOME	$ 2.3	$ 4.9	$ 18.5	$ 9.2

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Offsetting of Assets and Liabilities (Offsetting of Derivative Assets and Securities Purchased Under Agreements to Resell) (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED ASSETS	$ 2,098,000,000.0	$ 2,844,000,000.0
Gross Amounts Offset in the Balance Sheet	1,408,300,000	2,338,000,000.0
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	689,700,000	506,000,000.0
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	29,700,000	16,500,000
Net Amount	660,000,000.0	489,500,000
Total Derivatives Not Subject to a Master Netting Arrangement
GROSS RECOGNIZED ASSETS	515,200,000	543,700,000
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	900,000	300,000
Net Amount	514,300,000	543,400,000
Total Derivatives
GROSS RECOGNIZED ASSETS	2,613,200,000	3,387,700,000
Derivative Assets	1,204,900,000	1,049,700,000
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	30,600,000	16,800,000
Net Amount	1,174,300,000	1,032,900,000
Securities Purchased under Agreements to Resell
GROSS RECOGNIZED ASSETS	1,533,400,000	707,800,000
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	1,533,400,000	707,800,000
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	1,533,400,000	707,800,000
Other assets excluding derivatives and non financial instruments	7,300,000,000	7,400,000,000
Federal funds sold	0	5,000,000.0
Foreign Exchange Contracts | Over the Counter Derivative
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED ASSETS	1,764,300,000	2,691,100,000
Gross Amounts Offset in the Balance Sheet	1,405,700,000	2,334,100,000
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	358,600,000	357,000,000.0
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	29,700,000	16,500,000
Net Amount	328,900,000	340,500,000
Interest Rate Swap Contracts | Over the Counter Derivative
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED ASSETS	333,700,000	151,900,000
Gross Amounts Offset in the Balance Sheet	2,600,000	3,900,000
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	331,100,000	148,000,000.0
Net Amount	$ 331,100,000	148,000,000.0
Interest Rate Swap Contracts | Interest Rate Swaps Exchange Cleared
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED ASSETS		1,000,000.0
Gross Amounts Offset in the Balance Sheet		0
NET AMOUNTS PRESENTED IN THE BALANCE SHEET		1,000,000.0
Net Amount		$ 1,000,000.0

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Offsetting of Assets and Liabilities (Offsetting of Derivative Liabilities and Securities Sold Under Agreements to Repurchase) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	$ 2,143.8	$ 2,312.4
Gross Amounts Offset in the Balance Sheet	1,603.3	1,618.4
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	540.5	694.0
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.1
Net Amount	540.5	693.9
Total Derivatives Not Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	357.0	1,000.6
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0
Net Amount	357.0	1,000.6
Offsetting Derivative Liabilities [Abstract]
GROSS RECOGNIZED LIABILITIES	2,500.8	3,313.0
Derivative Liabilities	897.5	1,694.6
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.1
Net Amount	897.5	1,694.5
Securities Sold under Agreements to Repurchase
GROSS RECOGNIZED LIABILITIES	269.8	489.7
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	269.8	489.7
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	269.8	489.7
Other liabilities	3,600.0	3,100.0
Foreign Exchange Contracts | Over the Counter Derivative
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	1,969.2	2,181.6
Gross Amounts Offset in the Balance Sheet	1,493.6	1,548.6
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	475.6	633.0
GROSS AMOUNTS NOT OFFSET IN THE BALANCE SHEET	0.0	0.1
Net Amount	475.6	632.9
Interest Rate Swap Contracts | Over the Counter Derivative
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	142.3	96.7
Gross Amounts Offset in the Balance Sheet	109.7	57.3
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	32.6	39.4
Net Amount	32.6	39.4
Interest Rate Swap Contracts | Interest Rate Swaps Exchange Cleared
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES		0.7
Gross Amounts Offset in the Balance Sheet		0.0
NET AMOUNTS PRESENTED IN THE BALANCE SHEET		0.7
Net Amount		0.7
Other Financial Derivatives
Total Derivatives Subject to a Master Netting Arrangement
NET AMOUNTS PRESENTED IN THE BALANCE SHEET	32.3	20.9
Net Amount	32.3	20.9
Other Financial Derivatives | Other Financial Derivatives
Total Derivatives Subject to a Master Netting Arrangement
GROSS RECOGNIZED LIABILITIES	32.3	33.4
Gross Amounts Offset in the Balance Sheet	$ 0.0	$ 12.5

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Offsetting of Assets and Liabilities (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Offsetting Assets and Liabilities [Line Items]
Collateral received	$ 29.7	$ 16.5
Gross amounts not offset in the balance sheet	0.0	0.1
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position	565.5	766.2
Collateral deposited with derivative counterparties for derivatives instruments with credit-risk-related contingent features that are in a liability position	184.4	327.1
Net maximum amount of termination payments that could have been required	381.1	439.1
Net Investment Hedges
Offsetting Assets and Liabilities [Line Items]
Collateral received	281.0
Gross amounts not offset in the balance sheet	$ 280.8
Cash collateral received from derivative counterparties and not offset against derivative assets		196.3
Cash collateral deposited with derivative counterparties not offset against derivative liabilities		$ 2.0