10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

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

For the Quarterly Period Ended June 30, 2015

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. 0-5965

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 Chicago, Illinois	60603
(Address of principal executive offices)	(Zip Code)

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

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 and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

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

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

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

232,852,813 Shares – $1.66 2/3 Par Value

(Shares of Common Stock Outstanding on June 30, 2015)

NORTHERN TRUST CORPORATION

QUARTERLY REPORT ON FORM 10-Q

FOR THE QUARTERLY PERIOD ENDED JUNE 30, 2015

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; Quantitative and Qualitative Disclosures About Market Risk		3
Item 1: Consolidated Financial Statements (unaudited)		31
Consolidated Balance Sheet		31
Consolidated Statement of Income		32
Consolidated Statement of Comprehensive Income		32
Consolidated Statement of Changes in Stockholders’ Equity		33
Consolidated Statement of Cash Flows		34
Notes to Consolidated Financial Statements		35
Item 4: Controls and Procedures		82
Part II – Other Information
Item 1: Legal Proceedings		82
Item 2: Unregistered Sales of Equity Securities and Use of Proceeds		82
Item 6: Exhibits		82
Signatures		83

i

CONSOLIDATED FINANCIAL HIGHLIGHTS

(UNAUDITED)

	Three Months Ended June 30,								Six Months Ended June 30,
CONDENSED INCOME STATEMENT (In Millions)	2015			2014		% Change (*)			2015			2014		% Change (*)
Noninterest Income	$	1,004.7		$	835.1		20	%		1,878.6			1,629.9		15
Net Interest Income		251.2			246.6		2			511.8			492.3		4
Provision for Credit Losses		(10.0	)		—		N/M			(14.5	)		3.0		N/M
Noninterest Expense		854.5			811.0		5			1,643.5			1,579.0		4
Income before Income Taxes		411.4			270.7		52			761.4			540.2		41
Provision for Income Taxes		142.2			88.8		60			261.5			176.9		48
Net Income	$	269.2		$	181.9		48	%	$	499.9		$	363.3		38	%
PER COMMON SHARE
Net Income — Basic	$	1.11		$	0.76		46	%	$	2.06		$	1.51		36	%
— Diluted		1.10			0.75		47			2.04			1.50		36
Cash Dividends Declared Per Common Share		0.36			0.33		9			0.69			0.64		8
Book Value — End of Period (EOP)		35.91			34.14		5			35.91			34.14		5
Market Price — EOP		76.46			64.21		19			76.46			64.21		19
SELECTED BALANCE SHEET DATA (In Millions)
	June 30, 2015			December 31, 2014		% Change (*)
End of Period:
Assets	$	119,942.9		$	109,946.5		9	%
Earning Assets		109,565.3			100,889.8		9
Deposits		100,687.9			90,757.0		11
Stockholders’ Equity		8,749.3			8,448.9		4
	Three Months Ended June 30,								Six Months Ended June 30,
	2015			2014		% Change (*)			2015			2014		% Change (*)
Average Balances:
Assets	$	111,691.1		$	103,324.1		8	%	$	109,613.7		$	101,792.3		8
Earning Assets		103,806.0			95,472.7		9			101,263.7			93,666.7		8
Deposits		92,335.1			84,645.2		9			89,446.7			82,707.3		8
Stockholders’ Equity		8,607.9			7,947.2		8			8,540.7			7,936.8		8
CLIENT ASSETS (In Billions)	June 30, 2015			December 31, 2014		% Change (*)
Assets Under Custody	$	6,177.0		$	5,968.8		3	%
Assets Under Management		945.6			934.1		1

1

SELECTED RATIOS AND METRICS
	Three Months Ended June 30,									Six Months Ended June 30,
	2015			2014			% Change (*)			2015			2014			% Change (*)
Financial Ratios:
Return on Average Common Equity		12.85	%		9.18	%		40	%		12.08	%		9.23	%		31
Return on Average Assets		0.97			0.71			36			0.92			0.72			28
Dividend Payout Ratio		32.7			44.0			(26	)		33.8			42.7			(21	)
Net Interest Margin (**)		1.00			1.06			(6	)		1.04			1.09			(5	)

	June 30, 2015						December 31, 2014
	Advanced Approach			Standardized Approach (a)			Advanced Approach			Standardized Approach (a)
Capital Ratios:
Northern Trust Corporation
Common Equity Tier 1		12.0	%		10.7	%		12.4	%		12.5	%
Tier 1		12.6			11.2			13.2			13.3
Total		14.4			13.2			15.0			15.5
Tier 1 Leverage		7.6			7.6			n/a			7.8
Supplementary Leverage (b)		6.3			n/a			n/a			n/a
The Northern Trust Company
Common Equity Tier 1		11.6	%		10.1	%		12.0	%		11.8	%
Tier 1		11.6			10.1			12.0			11.8
Total		13.2			11.9			13.8			14.0
Tier 1 Leverage		6.8			6.8			n/a			6.9
Supplementary Leverage (b)		5.6			n/a			n/a			n/a

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

(**) 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 27.

(a) In 2014, Standardized Approach risk-weighted assets were determined by Basel I requirements. Effective with the first quarter of 2015, risk-weighted assets are calculated in accordance with the Basel III Standardized Approach final rules.

(b) Beginning with the first quarter of 2015, advanced approaches banking organizations must calculate and report their supplementary leverage ratio. Effective January 1, 2018, advanced approaches institutions, such as the Corporation, will be subject to a minimum supplementary leverage ratio of 3 percent.

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

SECOND QUARTER CONSOLIDATED RESULTS OF OPERATIONS

General

Northern Trust Corporation (Corporation) is a financial holding company that is a leading provider of asset servicing, fund administration, asset management, fiduciary and banking solutions for corporations, institutions, families and individuals worldwide. 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 term “Northern Trust,” “we,” “us,” “our” or similar terms mean the Corporation and its subsidiaries on a consolidated basis.

The following should be read in conjunction with the consolidated financial statements and related footnotes included in this report. Investors also should read the section entitled “Forward-Looking Statements.”

Overview

Net income per diluted common share in the current quarter was $1.10, up from $0.75 in the second quarter of 2014. Net income was $269.2 million in the current quarter as compared to $181.9 million in the prior-year quarter. Annualized return on average common equity in the quarter was 12.8% as compared to 9.2% in the prior-year quarter. The annualized return on average assets was 1.0% as compared to 0.7% in the prior-year quarter.

The current quarter includes a net pre-tax gain on the sale of 1.0 million Visa Inc. Class B common shares totaling $99.9 million; voluntary cash contributions to certain constant dollar net-asset-value (NAV) funds of $45.8 million; and the impairment of the residual value of certain aircraft under leveraged lease agreements of $17.8 million. Excluding these items, net income per diluted common share, net income, and return on average common equity were $1.01, $246.7 million and 11.8%, respectively.

The prior-year quarter included pre-tax charges of $32.8 million for severance and related costs and for the realignment of the Corporation’s real estate portfolio and $9.5 million of software write-offs. Excluding these charges and write-offs, net income per diluted common share, net income, and return on average common equity were $0.87, $209.8 million, and 10.6%, respectively.

Revenue of $1.26 billion was up $174.2 million, or 16%, from $1.08 billion in the prior-year quarter. Noninterest income increased $169.6 million, or 20%, to $1.00 billion from $835.1 million in the prior-year quarter, primarily reflecting the $99.9 million net gain on the sale of Visa Inc. Class B common shares, higher trust, investment and other servicing fees and foreign exchange trading income.

Net interest income increased 2% to $251.2 million in the current quarter as compared to $246.6 million in the prior-year quarter, due to growth in earning assets, offset by the $17.8 million impairment of the residual value of certain aircraft under leveraged lease agreements and a lower net interest margin.

The provision for credit losses was a credit of $10.0 million in the current quarter, reflecting improved credit quality. There was no provision for credit losses recorded in the prior-year quarter.

Noninterest expense totaled $854.5 million, up $43.5 million, or 5%, from $811.0 million in the prior-year quarter. The current quarter includes the $45.8 million charge related to voluntary cash contributions to certain

3

SECOND QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Overview (continued)

constant dollar NAV funds. The prior-year quarter includes the $32.8 million charge for severance and related costs and realignment of the Corporation’s real estate portfolio and $9.5 million of software write-offs. Excluding the current- and prior-year quarter charges and write-offs, noninterest expense increased $40.0 million, or 5%, primarily attributable to higher compensation, equipment and software, other operating and employee benefits expense.

Noninterest Income

The components of noninterest income are provided below.

Table 1: Noninterest Income

Noninterest Income	Three Months Ended June 30,
($ In Millions)	2015			2014		Change
Trust, Investment and Other Servicing Fees	$	756.8		$	706.9	$	49.9		7	%
Foreign Exchange Trading Income		74.8			52.9		21.9		41
Treasury Management Fees		16.1			16.6		(0.5	)	(3	)
Security Commissions and Trading Income		20.0			17.8		2.2		12
Other Operating Income		137.4			40.5		96.9		N/M
Investment Security Gains (Losses), net		(0.4	)		0.4		(0.8	)	N/M
Total Noninterest Income	$	1,004.7		$	835.1	$	169.6		20	%

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. For a further discussion of trust, investment and other servicing fees and how they are derived, refer to the “Reporting Segments” section.

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

Table 2: Assets Under Custody

Assets Under Custody	June 30, 2015		March 31, 2015		June 30, 2014		Change Q2-15/ Q1-15			Change Q2-15/ Q2-14
($ In Billions)
Corporate & Institutional	$	5,652.6	$	5,566.2	$	5,488.0		2	%		3	%
Wealth Management		524.4		524.6		516.6		—			2
Total Assets Under Custody	$	6,177.0	$	6,090.8	$	6,004.6		1	%		3	%

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

Table 3: Allocations of Assets Under Custody

	June 30, 2015									March 31, 2015									June 30, 2014
Assets Under Custody	C&IS			WM			Total			C&IS			WM			Total			C&IS			WM			Total
Equities		45	%		55	%		46	%		45	%		55	%		46	%		45	%		56	%		46	%
Fixed Income Securities		37			23			35			37			23			35			37			21			36
Cash and Other Assets		18			22			19			18			22			19			18			23			18

4

SECOND QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Income (continued)

The 3% increase in consolidated assets under custody from $6.09 trillion at June 30, 2014, to $6.18 trillion as of June 30, 2015, primarily reflected increased net new business driven by institutional clients in global funds services, primarily in equities.

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

Table 4: Assets Under Management

Assets Under Management	June 30, 2015		March 31, 2015		June 30, 2014		Change Q2-15/ Q1-15			Change Q2-15/ Q2-14
($ In Billions)
Corporate & Institutional	$	713.6	$	727.0	$	701.5		(2	)%		2	%
Wealth Management		232.0		233.1		222.9		—			4
Total Assets Under Management	$	945.6	$	960.1	$	924.4		(2	)%		2	%

The following table presents consolidated assets under management as of June 30, 2015, and June 30, 2014, by investment type.

Table 5: Assets Under Management by Investment Type

($ In Billions)	June 30, 2015		June 30, 2014
Equities	$	487.7	$	495.7
Fixed Income Securities		167.7		153.2
Cash and Other Assets		169.9		159.0
Securities Lending Collateral		120.3		116.5
Total Assets Under Management	$	945.6	$	924.4

The 2% increase in consolidated assets under management from $924.4 billion at June 30, 2014, to $945.6 billion as of June 30, 2015, primarily reflected higher fixed income securities, cash and securities lending collateral, partially offset by lower equity assets, driven in part by a stronger U.S. dollar.

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

Table 6: Allocations of Assets Under Management

	June 30, 2015									March 31, 2015									June 30, 2014
Assets Under Management	C&IS			WM			Total			C&IS			WM			Total			C&IS			WM			Total
Equities		53	%		47	%		51	%		53	%		46	%		52	%		56	%		48	%		54	%
Fixed Income Securities		14			28			18			14			28			17			13			28			16
Securities Lending Collateral		17			—			13			17			—			13			16			—			13
Cash and Other Assets		16			25			18			16			26			18			15			24			17

Changes in assets under custody and under management are in comparison to the twelve month increase in the S&P 500^® index of 5.2% and decline in the MSCI EAFE^® index (USD) of 6.6%.

Foreign exchange trading income totaled $74.8 million in the current quarter, up $21.9 million, or 41%, compared to $52.9 million in the prior-year quarter. The increase was primarily attributable to higher currency volatility and client volumes as compared to the prior-year quarter.

Security commissions and trading income totaled $20.0 million, up 12%, compared with $17.8 million in the prior-year quarter. The increase was attributable to higher referral fees and higher income from interest rate protection products sold to clients.

5

SECOND QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Income (continued)

Other operating income totaled $137.4 million, up $96.9 million, compared to $40.5 million in the prior-year quarter. The components of other operating income are provided below.

Table 7: Other Operating Income

Other Operating Income	Three Months Ended June 30,
($ In Millions)	2015		2014		Change
Loan Service Fees	$	14.6	$	16.0	$	(1.4	)	(9	)%
Banking Service Fees		11.8		12.6		(0.8	)	(7	)
Other Income		111.0		11.9		99.1		N/M
Total Other Operating Income	$	137.4	$	40.5	$	96.9		N/M	%

Other income in the current quarter includes the $99.9 million net gain on the sale of 1.0 million Visa Inc. Class B common shares. Excluding the gain, other operating income totaled $37.5 million, down 7%, from the prior-year quarter, reflecting decreases in loan and banking services fees and various miscellaneous income categories.

6

SECOND QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income

The following table presents an analysis of average balances and interest rate changes affecting net interest income.

Table 8: AVERAGE CONSOLIDATED BALANCE SHEET WITH ANALYSIS OF NET INTEREST INCOME									NORTHERN TRUST CORPORATION
(INTEREST AND RATE ON A FULLY TAXABLE EQUIVALENT BASIS)	Second Quarter
	2015								2014
($ In Millions)	Interest		Average Balance			Rate (4)			Interest		Average Balance			Rate (4)
Average Earning Assets
Federal Funds Sold and Securities Purchased under
Agreements to Resell	$	1.2	$	1,041.9			0.46	%	$	0.7	$	554.1			0.47	%
Interest-Bearing Due from and Deposits with Banks (1)		28.7		16,920.6			0.68			33.6		17,294.6			0.78
Federal Reserve Deposits		9.5		14,992.1			0.25			8.4		13,266.4			0.26
Securities
U.S. Government		13.4		4,789.1			1.12			6.7		2,368.7			1.13
Obligations of States and Political Subdivisions		1.9		112.2			6.75			2.8		168.4			6.76
Government Sponsored Agency		34.2		16,821.7			0.82			33.3		18,359.8			0.73
Other (2)		33.8		16,207.0			0.84			27.8		13,407.8			0.83
Total Securities		83.3		37,930.0			0.88			70.6		34,304.7			0.83
Loans and Leases (3)		172.5		32,921.4			2.10			187.3		30,052.9			2.50
Total Earning Assets		295.2		103,806.0			1.14			300.6		95,472.7			1.26
Allowance for Credit Losses Assigned to Loans and Leases		—		(260.0	)		—			—		(276.8	)		—
Cash and Due from Banks		—		2,142.9			—			—		2,838.4			—
Buildings and Equipment		—		446.5			—			—		450.7			—
Client Security Settlement Receivables		—		945.0			—			—		781.0			—
Goodwill		—		531.1			—			—		543.0			—
Other Assets		—		4,079.6			—			—		3,515.1			—
Total Assets	$	—	$	111,691.1			—	%	$	—	$	103,324.1			—	%
Average Source of Funds
Deposits
Savings and Money Market	$	2.4	$	15,705.4			0.06	%	$	2.4	$	14,828.6			0.06	%
Savings Certificates and Other Time		2.1		1,779.5			0.48			1.6		1,996.2			0.32
Non-U.S. Offices — Interest-Bearing		13.9		49,291.8			0.11			18.4		48,988.1			0.15
Total Interest-Bearing Deposits		18.4		66,776.7			0.11			22.4		65,812.9			0.14
Short-Term Borrowings		1.3		4,404.8			0.12			1.2		4,217.8			0.12
Senior Notes		11.9		1,497.1			3.14			13.7		1,661.6			3.30
Long-Term Debt		5.5		1,380.2			1.59			9.4		1,642.4			2.30
Floating Rate Capital Debt		0.5		277.3			0.84			0.5		277.2			0.80
Total Interest-Related Funds		37.6		74,336.1			0.20			47.2		73,611.9			0.26
Interest Rate Spread		—		—			0.94			—		—			1.00
Demand and Other Noninterest-Bearing Deposits		—		25,558.4			—			—		18,832.3			—
Other Liabilities		—		3,188.7			—			—		2,932.7			—
Stockholders’ Equity		—		8,607.9			—			—		7,947.2			—
Total Liabilities and Stockholders’ Equity	$	—	$	111,691.1			—	%	$	—	$	103,324.1			—	%
Net Interest Income/Margin (FTE Adjusted)	$	257.6	$	—			1.00	%	$	253.4	$	—			1.06	%
Net Interest Income/Margin (Unadjusted)	$	251.2	$	—			0.97	%	$	246.6	$	—			1.04	%

7

SECOND QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income (continued)

ANALYSIS OF NET INTEREST INCOME CHANGES

DUE TO VOLUME AND RATE

	Three Months Ended June 30, 2015/2014
	Change Due To
(In Millions)	Average Balance		Rate			Total
Earning Assets (FTE)	$	26.2	$	(31.6	)	$	(5.4	)
Interest-Related Funds		0.5		(10.1	)		(9.6	)
Net Interest Income (FTE)	$	25.7	$	(21.5	)	$	4.2

(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 sheet in our periodic filings with the U.S. Securities and Exchange Commission.

(2) Other securities include certain community development investments and Federal Home Loan Bank and Federal Reserve stock of $193.9 million, $131.1 million and $54.0 million, which are classified in other assets in the consolidated balance sheet as of June 30, 2015 and 2014.

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

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

Notes: Net Interest Income (FTE Adjusted) includes adjustments to a fully taxable equivalent basis for loans and securities. Such adjustments are based on a blended federal and state tax rate of 37.7% and 37.8% for the three months ended June 30, 2015 and 2014, respectively. Total taxable equivalent interest adjustments amounted to $6.4 million and $6.8 million for the three months ended June 30, 2015 and 2014, respectively.

Interest revenue on cash collateral positions is reported above within interest-bearing 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 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.

Net interest income on a fully taxable equivalent (FTE) basis totaled $257.6 million, up 2%, compared to $253.4 million in the prior-year quarter. The increase was primarily the result of growth in earning assets, partially offset by the $17.8 million impairment of the residual value of certain aircraft under leveraged lease agreements and a lower net interest margin. Earning assets for the current quarter averaged $103.8 billion, up $8.3 billion, or 9%, from $95.5 billion in the prior-year quarter, primarily resulting from higher levels of securities, reflecting demand deposit growth, combined with increased loan volume.

The net interest margin on an FTE basis, declined to 1.00% in the current quarter from 1.06% in the prior-year quarter. Excluding the impairment noted above, the net interest margin was 1.06%, unchanged from the prior-year quarter, as higher securities yields and lower cost of interest-related funds were offset by lower loan and short-term interest-bearing deposit yields.

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 (a non-GAAP financial measure) is provided on page 27.

Earning assets for the quarter averaged $103.8 billion, up $8.3 billion, or 9%, from $95.5 billion in the prior-year quarter. Federal Reserve deposits averaged $15.0 billion, up $1.7 billion, or 13%, from $13.3 billion in the prior-year quarter. Average securities were $37.9 billion, up $3.6 billion, or 11%, from $34.3 billion in the prior-year quarter and include certain community development investments and Federal Home Loan Bank and Federal Reserve stock of $193.9 million, $131.1 million and $54.0 million, respectively, which are recorded in other assets in the consolidated balance sheets.

Loans and leases averaged $32.9 billion, up $2.9 billion, or 10%, from $30.1 billion in the prior-year quarter, primarily reflecting higher levels of private client loans, commercial and institutional loans, and commercial real

8

SECOND QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income (continued)

estate loans. Private client loans averaged $8.0 billion, up $1.5 billion, or 23%, from $6.5 billion for the prior-year quarter. Commercial and institutional loans averaged $9.0 billion, up $1.1 billion, or 14%, from $7.9 billion for the prior-year quarter. Commercial real estate loans averaged $3.6 billion, up $487.6 million, or 16%, from $3.1 billion for the prior-year quarter.

Northern Trust utilizes a diverse mix of funding sources. Total interest-bearing deposits averaged $66.8 billion, compared to $65.8 billion in the prior-year quarter, an increase of $963.8 million, or 1%. Other interest-bearing funds averaged $7.6 billion, a decrease of $239.6 million, from $7.8 billion in the prior-year quarter, attributable to decreased long-term debt and senior notes, partially offset by increased short-term borrowings. 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 utilized to fund earning assets increased $7.6 billion, or 35%, to $29.5 billion from $21.9 billion in the prior-year quarter, primarily resulting from higher levels of demand and other noninterest-bearing deposits.

Provision for Credit Losses

The provision for credit losses was a credit of $10.0 million in the current quarter, reflecting improved credit quality. No provision for credit losses was recorded in the prior-year quarter. Net charge-offs in the current quarter were $2.6 million, resulting from charge-offs of $6.1 million and recoveries of $3.5 million. The prior-year quarter included $5.9 million of net charge-offs, resulting from $7.8 million of charge-offs and $1.9 million of recoveries. Nonperforming assets decreased 10% from the prior-year quarter. Residential real estate loans and commercial real estate loans accounted for 76% and 12%, respectively, of total nonperforming loans and leases at June 30, 2015. For additional discussion of the provision and allowance for credit losses, refer to the “Asset Quality” section beginning on page 22.

Noninterest Expense

The components of noninterest expense are provided below.

Table 9: Noninterest Expense

Noninterest Expense	Three Months Ended June 30,
($ In Millions)	2015		2014		Change
Compensation	$	361.9	$	372.4	$	(10.5	)	(3	)%
Employee Benefits		73.2		68.5		4.7		7
Outside Services		147.2		144.6		2.6		2
Equipment and Software		114.4		116.1		(1.7	)	(2	)
Occupancy		43.0		47.2		(4.2	)	(9	)
Other Operating Expense		114.8		62.2		52.6		85
Total Noninterest Expense	$	854.5	$	811.0	$	43.5		5	%

Compensation expense, the largest component of noninterest expense, totaled $361.9 million in the current quarter, down $10.5 million, or 3%, from $372.4 million in the prior-year quarter. The prior-year quarter included severance-related charges of $25.5 million. Excluding the severance-related charges, compensation expense increased $15.0 million, or 4%, reflecting higher performance-based compensation, staff levels and base pay adjustments, partially offset by the favorable impact in foreign exchange rates. Staff on a full-time equivalent basis at June 30, 2015, totaled approximately 15,800, up 4% from June 30, 2014.

9

SECOND QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Expense (continued)

Employee benefit expense totaled $73.2 million in the current quarter, up 7%, from $68.5 million in the prior-year quarter. The prior-year quarter included $1.9 million of severance- related charges. Excluding these charges, employee benefit expense increased $6.6 million, or 10%, attributable to higher pension and employee medical expense.

Expense associated with outside services totaled $147.2 million in the current quarter, up 2%, from $144.6 million in the prior-year quarter. The prior-year quarter included $1.1 million of severance-related charges. Excluding these charges, outside services expense increased 3%, reflecting higher technical services.

Equipment and software expense totaled $114.4 million in the current quarter, down 2%, from $116.1 million in the prior-year quarter. The prior-year quarter included $9.5 million of write-offs of replaced or eliminated software. Excluding these write-offs, equipment and software expense increased $7.8 million, or 7%, reflecting higher software amortization.

Occupancy expense totaled $43.0 million, down 9%, from $47.2 million in the prior-year quarter. The prior-year quarter included charges totaling $4.3 million in connection with reductions in office space. Excluding these charges, occupancy expense was relatively unchanged from the prior-year quarter.

Other operating expense totaled $114.8 million in the current quarter, up $52.6 million, or 85%, from $62.2 million in the prior-year quarter. The components of other operating expense are provided below.

Table 10: Other Operating Expense

Other Operating Expense	Three Months Ended June 30,
($ In Millions)	2015		2014		Change
Business Promotion	$	20.8	$	19.1	$	1.7		9	%
Staff Related		9.3		10.1		(0.8	)	(8	)
FDIC Insurance Premiums		5.8		4.7		1.1		22
Other Intangibles Amortization		2.1		5.0		(2.9	)	(57	)
Other Expenses		76.8		23.3		53.5		N/M
Total Other Operating Expense	$	114.8	$	62.2	$	52.6		85	%

In the current quarter, other expenses includes a charge related to voluntary cash contributions to certain constant dollar NAV funds totaling $45.8 million, to bring the NAVs of these funds to $1.00. Excluding the current-quarter charge, other operating expense increased $6.8 million, or 11%, reflecting higher charitable contributions and charges associated with account servicing activities.

Provision for Income Taxes

Income tax expense was $142.2 million in the current quarter, representing an effective tax rate of 34.6%, compared to $88.8 million in the prior-year quarter, representing an effective tax rate of 32.8%.

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. Income and expense associated with the wholesale funding activities and investment portfolios of the Corporation and its principal subsidiary, The Northern Trust Company (the Bank), as well as certain corporate-based expense, executive level compensation and nonrecurring items, are not allocated to C&IS and Wealth Management, and are reported in Northern Trust’s third reporting segment, Treasury and Other, in the following pages.

10

REPORTING SEGMENTS (continued)

The following tables reflect the earnings contributions and average assets of Northern Trust’s reporting segments for the three- and six-month periods ended June 30, 2015, and 2014. Reporting segment financial information, presented on an internal management-reporting basis, is determined by accounting systems that are used to allocate revenue and expense related to each segment and incorporates processes for allocating assets, liabilities, equity and the applicable interest income and expense.

Table 11: Results of Reporting Segments

Three Months Ended June 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2015			2014			2015			2014			2015			2014			2015			2014
Noninterest Income
Trust, Investment and Other Servicing Fees	$	432.0		$	395.4		$	324.8		$	311.5		$	—		$	—		$	756.8		$	706.9
Foreign Exchange Trading Income		71.8			50.7			3.0			2.2			—			—			74.8			52.9
Other Noninterest Income		43.2			47.1			26.8			23.1			103.1			5.1			173.1			75.3
Net Interest Income (FTE)*		92.7			76.7			141.0			132.6			23.9			44.1			257.6			253.4
Revenue*		639.7			569.9			495.6			469.4			127.0			49.2			1,262.3			1,088.5
Provision for Credit Losses		2.0			2.4			(12.0	)		(2.4	)		—			—			(10.0	)		—
Noninterest Expense		488.2			446.4			322.7			329.4			43.6			35.2			854.5			811.0
Income before Income Taxes*		149.5			121.1			184.9			142.4			83.4			14.0			417.8			277.5
Provision for Income Taxes*		45.3			36.1			69.6			53.6			33.7			5.9			148.6			95.6
Net Income	$	104.2		$	85.0		$	115.3		$	88.8		$	49.7		$	8.1		$	269.2		$	181.9
Percentage of Consolidated Net Income		39	%		47	%		43	%		49	%		18	%		4	%		100	%		100	%
Average Assets	$	43,299.8		$	59,995.2		$	24,826.5		$	22,210.8		$	43,564.8		$	21,118.1		$	111,691.1		$	103,324.1

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $6.4 million for 2015 and $6.8 million for 2014.

Six Months Ended June 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2015			2014			2015			2014			2015			2014			2015			2014
Noninterest Income
Trust, Investment and Other Servicing Fees	$	839.3		$	774.6		$	645.0		$	611.8		$	—		$	—		$	1,484.3		$	1,386.4
Foreign Exchange Trading Income		139.3			98.8			7.1			4.2			—			—			146.4			103.0
Other Noninterest Income		85.1			91.5			55.6			45.8			107.2			3.2			247.9			140.5
Net Interest Income (FTE)*		188.7			150.4			279.3			267.6			56.4			89.8			524.4			507.8
Revenue*		1,252.4			1,115.3			987.0			929.4			163.6			93.0			2,403.0			2,137.7
Provision for Credit Losses		(0.2	)		3.6			(14.3	)		(0.6	)		—			—			(14.5	)		3.0
Noninterest Expense		923.1			869.9			644.6			648.2			75.8			60.9			1,643.5			1,579.0
Income before Income Taxes*		329.5			241.8			356.7			281.8			87.8			32.1			774.0			555.7
Provision for Income Taxes*		102.6			70.9			134.2			106.2			37.3			15.3			274.1			192.4
Net Income	$	226.9		$	170.9		$	222.5		$	175.6		$	50.5		$	16.8		$	499.9		$	363.3
Percentage of Consolidated Net Income		45	%		47	%		45	%		48	%		10	%		5	%		100	%		100	%
Average Assets	$	41,540.9		$	58,631.4		$	24,569.1		$	22,368.8			43,503.7			20,792.1		$	109,613.7		$	101,792.3

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $12.6 million for 2015 and $15.5 million for 2014.

11

REPORTING SEGMENTS (continued)

Corporate & Institutional Services

C&IS net income totaled $104.2 million in the current quarter compared to $85.0 million in the prior-year quarter, an increase of $19.2 million, or 23%. Noninterest income was $547.0 million in the current quarter, up $53.8 million, or 11%, from $493.2 million in the prior-year quarter, reflecting higher trust, investment and other servicing fees and foreign exchange trading income. The following table provides a summary of C&IS trust, investment and other servicing fees.

Table 12: C&IS Trust, Investment and Other Servicing Fees

	Three Months Ended June 30,
($ In Millions)	2015		2014		Change
Custody and Fund Administration	$	293.6	$	261.1	$	32.5		12	%
Investment Management		80.6		77.7		2.9		4
Securities Lending		26.8		30.0		(3.2	)	(11	)
Other		31.0		26.6		4.4		17
Total C&IS Trust, Investment and Other Servicing Fees	$	432.0	$	395.4	$	36.6		9	%

Custody and fund administration fees, the largest component of C&IS fees, are driven primarily by values of client assets under custody, 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 quarter- end or month-end values, values at the beginning of each quarter or average values for a month or quarter. The fund administration fees that are asset-value-related are priced using month-end, quarter-end, or average daily balances. Investment management fees, which are based generally on client assets under management, are based primarily on market values throughout a period.

Custody and fund administration fees increased 12%, driven by new business and higher equity markets, partially offset by the unfavorable impact of movements in foreign exchange rates. Investment management fees increased 4% due to new business, lower money market mutual fund fee waivers and higher equity markets. Money market mutual fund fee waivers in C&IS totaled $13.6 million in the current quarter compared to $14.8 million in the prior-year quarter. Securities lending decreased 11% due to changes in fee arrangements.

Foreign exchange trading income totaled $71.8 million in the current quarter, an increase of $21.1 million, or 42%, from $50.7 million in the prior-year quarter. The increase was primarily attributable to higher currency volatility and client volumes as compared to the prior-year quarter.

Other noninterest income in C&IS totaled $43.2 million in the current quarter, down 8%, from $47.1 million in the prior-year quarter, primarily reflecting decreases within various miscellaneous categories of other operating income, partially offset by higher security commissions and trading income.

Net interest income stated on an FTE basis was $92.7 million in the current quarter, up $16.0 million, or 21% from $76.7 million in the prior-year quarter. The increase in net interest income was attributable to an increase in the net interest margin, partially offset by lower levels of average earning assets and a $17.8 million impairment of the residual value of certain aircraft under leveraged lease agreements. The changes to both the net interest margin and average earning assets versus prior-year period were partially due to a change in presentation, as certain assets were transferred to the Treasury and Other segment in the prior quarter and the related internal funds pricing method was updated. As a result, the net interest margin increased to 0.99% from 0.57% in the prior-year quarter while average earning assets totaled $37.4 billion, a decrease of $16.4 billion, or 30%, from $53.8 billion in the prior-year quarter. The earning assets that remain consist primarily of intercompany assets and loans and leases. Funding sources were primarily comprised of non-U.S. custody-related interest-bearing deposits, which averaged $45.6 billion in the current quarter, relatively unchanged from the prior-year quarter.

12

REPORTING SEGMENTS (continued)

Corporate & Institutional Services (continued)

The provision for credit losses totaled $2.0 million in the current quarter, reflecting an increase in the level of commercial and institutional loans, partially offset by continued improvement in credit quality. The prior-year quarter included a provision of $2.4 million.

Total C&IS 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, totaled $488.2 million in the current quarter, up $41.8 million, or 9%, from $446.4 million in the prior-year quarter. The increase was primarily attributable to $36.6 million of the charge related to voluntary cash contributions to certain constant dollar NAV funds noted above allocated to C&IS.

Wealth Management

Wealth Management net income was $115.3 million in the current quarter, up $26.5 million, or 30%, from $88.8 million in the prior-year quarter. Noninterest income was $354.6 million, up $17.8 million, or 5%, from $336.8 million in the prior-year quarter, primarily reflecting higher trust, investment and other servicing fees. Trust, investment and other servicing fees in Wealth Management totaled $324.8 million in the current quarter, up $13.3 million, or 4%, from $311.5 million in the prior-year quarter. The following table provides a summary of Wealth Management trust, investment and other servicing fees.

Table 13: Wealth Management Trust, Investment and Other Servicing Fees

	Three Months Ended June 30,
($ In Millions)	2015		2014		Change
Central	$	128.2	$	126.2	$	2.0	2	%
East		85.9		83.0		2.9	3
West		68.5		65.0		3.5	5
Global Family Office		42.2		37.3		4.9	13
Total Wealth Management Trust, Investment and Other Servicing Fees	$	324.8	$	311.5	$	13.3	4	%

Wealth Management fee income is calculated primarily based on market values. The increased Wealth Management fees across regions and Global Family Office were primarily attributable to higher equity markets and new business. Money market mutual fund fee waivers in Wealth Management totaled $14.6 million in the current quarter compared to $15.9 million in the prior-year quarter.

Other noninterest income totaled $26.8 million in the current quarter, up $3.7 million, or 16%, from $23.1 million in the prior-year quarter, primarily reflecting increases within various miscellaneous categories of other operating income.

Net interest income stated on an FTE basis was $141.0 million in the current quarter, up $8.4 million, or 6%, from $132.6 million in the prior-year quarter, reflecting higher levels of average earning assets, partially offset by a decline in the net interest margin. The net interest margin decreased to 2.30% in the current quarter from 2.32% in the prior-year quarter due to lower yields on earning assets, partially offset by a lower cost of interest-related funds. Earning assets averaged $24.5 billion, up $1.5 billion, or 7%, from $23.0 billion in the prior-year quarter. Earning assets and funding sources were primarily comprised of loans and domestic retail interest-bearing deposits, respectively.

The provision for credit losses was a credit of $12.0 million in the current quarter, reflecting improvement in the credit quality of commercial real estate and private client loans, and a decrease in the level of residential real estate loans, partially offset by an increase in the level of private client and commercial real estate loans. The provision for credit losses was a credit of $2.4 million in the prior-year quarter.

13

REPORTING SEGMENTS (continued)

Wealth Management (continued)

Total 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, totaled $322.7 million in the current quarter, compared to $329.4 million in the prior-year quarter, a decrease of $6.7 million, or 2%. The decrease was primarily attributable to lower compensation and outside services expense, partially offset by higher indirect allocations, primarily attributable to $9.2 million of the charge related to voluntary cash contributions to certain constant dollar NAV funds allocated to Wealth Management.

Treasury and Other

Treasury and Other includes income and expense associated with the wholesale funding activities and the investment portfolios of the Corporation and the Bank, and certain corporate-based expenses, executive-level compensation and nonrecurring items not allocated to C&IS and Wealth Management.

Treasury and Other noninterest income totaled $103.1 million in the current quarter, compared to $5.1 million in the prior-year quarter. The increase reflects the $99.9 million net gain on the sale of 1.0 million of Visa Inc. Class B common shares recognized by the Corporation during the quarter. As of June 30, 2015, the Corporation continued to hold approximately 5.2 million Visa Inc. Class B common shares.

Net interest income decreased $20.2 million, or 46%, to $23.9 million in the current quarter, compared to $44.1 million in the prior-year quarter. The decrease reflects a decline in the net interest margin, partially offset by higher levels of earning assets. The changes to both the net interest margin and average earning assets versus prior year are partially due to a change in presentation, as certain assets were transferred to Treasury and Other from C&IS and the related internal funds pricing method was updated in the prior quarter. Average earning assets increased $23.1 billion to $41.8 billion from the prior-year quarter’s $18.7 billion.

Noninterest expense totaled $43.6 million in the current quarter, up $8.4 million, or 24%, from $35.2 million in the prior-year quarter, primarily reflecting higher general overhead costs, partially offset by higher indirect expense allocations to C&IS and Wealth Management as compared to the prior-year quarter.

SIX-MONTH CONSOLIDATED RESULTS OF OPERATIONS

Overview

Net income per diluted common share was $2.04 for the six months ended June 30, 2015 and $1.50 in the comparable prior-year period. Net income totaled $499.9 million, up $136.6 million, or 38%, as compared to $363.3 million in the prior-year period. The performance in the current period produced an annualized return on average common equity of 12.1%, compared to 9.2% in the prior-year period. The annualized return on average assets was 0.9%, compared to 0.7% in the prior-year period.

The current period includes a net pre-tax gain on the sale of 1.0 million Visa Inc. Class B common shares totaling $99.9 million; voluntary cash contributions to certain constant dollar NAV funds of $45.8 million; and the impairment of the residual value of certain aircraft under leveraged lease agreements of $17.8 million. Excluding the gain and charges, net income per diluted common share, net income, and return on average common equity were $1.95, $477.4 million and 11.5%, respectively.

The prior-year period included pre-tax charges of $32.8 million for severance and related costs and for the realignment of the Corporation’s real estate portfolio and $9.5 million of software write-offs. Excluding these charges and write-offs, net income per diluted common share, net income, and return on average common equity were $1.61, $391.1 million, and 9.9% respectively.

14

SIX-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Overview (continued)

Revenue for the six months ended June 30, 2015 totaled $2.39 billion, up $268.2 million, or 13%, as compared to $2.12 billion in the prior-year period. Noninterest income was $1.88 billion, up $248.7 million, or 15%, from $1.63 billion in the prior-year period. Trust, investment and other servicing fees increased $97.9 million, or 7%, to $1.48 billion from $1.39 billion in the prior-year period.

Noninterest Income

The components of noninterest income are provided below.

Table 14: Six Months Ended June 30 Noninterest Income

Noninterest Income	Six Months Ended June 30,
($ In Millions)	2015			2014			Change
Trust, Investment and Other Servicing Fees	$	1,484.3		$	1,386.4		$	97.9		7	%
Foreign Exchange Trading Income		146.4			103.0			43.4		42
Treasury Management Fees		32.4			33.4			(1.0	)	(3	)
Security Commissions and Trading Income		39.8			32.5			7.3		22
Other Operating Income		176.0			78.2			97.8		125
Investment Security Gains (Losses), net		(0.3	)		(3.6	)		3.3		(92	)
Total Noninterest Income	$	1,878.6		$	1,629.9		$	248.7		15	%

As illustrated in the following table, trust, investment and other servicing fees from C&IS increased $64.7 million, or 8%, totaling $839.3 million, compared to $774.6 million a year ago.

Table 15: Six Months Ended June 30 C&IS Trust, Investment and Other Servicing Fees

C&IS Trust, Investment and Other Servicing Fees	Six Months Ended June 30,
($ In Millions)	2015		2014		Change
Custody and Fund Administration	$	570.7	$	513.3	$	57.4		11	%
Investment Management		157.0		152.7		4.3		3
Securities Lending		48.4		52.7		(4.3	)	(8	)
Other		63.2		55.9		7.3		13
Total	$	839.3	$	774.6	$	64.7		8	%

Custody and fund administration fees, the largest component of C&IS fees, increased 11%, primarily driven by new business and higher equity markets, partially offset by the unfavorable impact of movements in foreign exchange rates. C&IS investment management fees increased 3%, primarily reflecting new business, lower money market mutual fund fee waivers and higher equity markets. Money market mutual fund fee waivers in C&IS totaled $28.8 million, compared to waived fees of $29.7 million in the prior-year period. Securities lending revenue decreased 8%, reflecting changes in fee arrangements and lower spreads, partially offset by higher loan volumes in the current period. Other fees in C&IS increased 13%, primarily reflecting increased sub-advisory fees.

15

SIX-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Income (continued)

As illustrated in the following table, trust, investment and other servicing fees from Wealth Management increased $33.2 million, or 5%, totaling $645.0 million, compared to $611.8 million a year ago.

Table 16: Six Months Ended June 30 Wealth Management Trust, Investment and Other Servicing Fees

	Six Months Ended June 30,
($ In Millions)	2015		2014		Change
Wealth Management Trust, Investment and Other Servicing Fees
Central	$	259.0	$	250.3	$	8.7	3	%
East		168.3		159.7		8.6	5
West		135.3		127.4		7.9	6
Global Family Office		82.4		74.4		8.0	11
Total	$	645.0	$	611.8	$	33.2	5	%

The increase is primarily due to higher equity markets and new business. Money market mutual fund fee waivers in Wealth Management totaled $32.3 million compared with $33.5 million in the prior-year period.

Foreign exchange trading income increased $43.4 million, or 42%, and totaled $146.4 million compared with $103.0 million in the prior-year period. The increase was attributable to higher currency volatility and client volumes compared to the prior-year period.

Other operating income increased $97.8 million to $176.0 million compared with $78.2 million in the prior-year period. The components of other operating income are provided below.

Table 17: Six Months Ended June 30 Other Operating Income

Other Operating Income	Six Months Ended June 30,
($ In Millions)	2015		2014		Change
Loan Service Fees	$	29.5	$	31.7	$	(2.2	)	(7	)%
Banking Service Fees		23.7		24.9		(1.2	)	(5	)
Other Income		122.8		21.6		101.2		N/M
Total Other Operating Income	$	176.0	$	78.2	$	97.8		125	%

The current-year period other income includes a $99.9 million net gain on the sale of a portion of the Visa Inc. Class B common shares held by the Corporation. Excluding the gain, other operating income totaled $76.1 million, down 3% from the prior-year period, primarily reflecting decreases in various miscellaneous income categories.

16

SIX-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income

The following table presents an analysis of average balances and interest rate changes affecting net interest income.

Table 18: AVERAGE CONSOLIDATED BALANCE SHEET WITH ANALYSIS OF NET INTEREST INCOME									NORTHERN TRUST CORPORATION
(INTEREST AND RATE ON A FULLY TAXABLE EQUIVALENT BASIS)	Six Months ended June 30,
		2015								2014
($ In Millions)	Interest		Average Balance			Rate (4)			Interest		Average Balance			Rate (4)
Average Earning Assets
Federal Funds Sold and Securities Purchased under
Agreements to Resell	$	2.4	$	1,037.8			0.46	%	$	1.3	$	542.3			0.49	%
Interest-Bearing Due from and Deposits with Banks (1)		55.3		16,096.4			0.69			65.7		17,179.2			0.77
Federal Reserve Deposits		18.7		14,749.4			0.26			16.5		12,986.0			0.26
Securities
U.S. Government		26.1		4,685.1			1.12			13.1		2,341.3			1.13
Obligations of States and Political Subdivisions		3.9		116.9			6.71			6.3		190.6			6.65
Government Sponsored Agency		71.6		16,667.7			0.87			74.2		18,098.7			0.83
Other (2)		64.3		15,397.5			0.84			55.9		12,711.0			0.89
Total Securities		165.9		36,867.2			0.91			149.5		33,341.6			0.90
Loans and Leases (3)		357.9		32,512.9			2.22			371.7		29,617.6			2.53
Total Earning Assets		600.2		101,263.7			1.20			604.7		93,666.7			1.30
Allowance for Credit Losses Assigned to Loans and Leases		—		(262.9	)		—			—		(277.3	)		—
Cash and Due from Banks		—		1,859.7			—			—		2,822.6			—
Buildings and Equipment		—		446.7			—			—		454.2			—
Client Security Settlement Receivables		—		952.3			—			—		842.3			—
Goodwill		—		530.4			—			—		541.9			—
Other Assets		—		4,823.8			—			—		3,741.9			—
Total Assets	$	—	$	109,613.7			—	%	$	—	$	101,792.3			—	%
Average Source of Funds
Deposits
Savings and Money Market	$	4.9	$	15,534.1			0.06	%	$	4.7	$	14,771.5			0.06	%
Savings Certificates and Other Time		3.3		1,760.7			0.38			3.4		1,911.3			0.36
Non-U.S. Offices — Interest-Bearing		26.9		48,351.1			0.11			34.4		47,784.0			0.15
Total Interest-Bearing Deposits		35.1		65,645.9			0.11			42.5		64,466.8			0.13
Short-Term Borrowings		2.8		4,794.0			0.12			2.3		4,384.0			0.11
Senior Notes		23.5		1,497.1			3.15			31.2		1,828.2			3.44
Long-Term Debt		13.3		1,475.5			1.82			19.8		1,685.4			2.37
Floating Rate Capital Debt		1.1		277.2			0.83			1.1		277.2			0.81
Total Interest-Related Funds		75.8		73,689.7			0.21			96.9		72,641.6			0.27
Interest Rate Spread		—		—			0.99			—		—			1.03
Demand and Other Noninterest-Bearing Deposits		—		23,800.8			—			—		18,240.5			—
Other Liabilities		—		3,582.5			—			—		2,973.4			—
Stockholders’ Equity		—		8,540.7			—			—		7,936.8			—
Total Liabilities and Stockholders’ Equity	$	—	$	109,613.7			—	%	$	—	$	101,792.3			—	%
Net Interest Income/Margin (FTE Adjusted)	$	524.4	$	—			1.04	%	$	507.8	$	—			1.09	%
Net Interest Income/Margin (Unadjusted)	$	511.8	$	—			1.02	%	$	492.3	$	—			1.06	%

17

SIX-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income (continued)

ANALYSIS OF NET INTEREST INCOME CHANGES DUE TO VOLUME AND RATE
	Six Months ended June 30, 2015/2014
	Change Due To
(In Millions)	Average Balance			Rate			Total
Earning Assets (FTE)	$	49.0		$	(53.5	)	$	(4.5	)
Interest-Related Funds		(1.3	)		(15.6	)		(16.9	)
Net Interest Income (FTE)	$	50.3		$	(37.9	)	$	12.4

(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 sheet in our periodic filings with the U.S. Securities and Exchange Commission.

(2) Other securities include certain community development investments and Federal Home Loan Bank and Federal Reserve stock of $199.8 million, $142.7 million and $53.5 million, which are classified in other assets in the consolidated balance sheet as of June 30, 2015 and 2014.

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

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

Notes: Net Interest Income (FTE Adjusted) includes adjustments to a fully taxable equivalent basis for loans and securities. Such adjustments are based on a blended federal and state tax rate of 37.7% and 37.8% for the six months ended June 30, 2015 and 2014, respectively. Total taxable equivalent interest adjustments amounted to $12.6 million and $15.5 million for the three months ended June 30, 2015 and 2014, respectively.

Interest revenue on cash collateral positions is reported above within interest-bearing 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, totaled $524.4 million, an increase of $16.6 million, or 3%, from $507.8 million reported in the prior-year period. The increase is the result of growth in earning assets, offset by a $17.8 million impairment of the residual value of certain aircraft under leveraged lease agreements and a lower net interest margin. Average earning assets were $101.3 billion, up $7.6 billion, or 8%, from $93.7 billion in the prior-year period, primarily attributable to higher levels of securities, loans and Federal Reserve deposits, reflecting higher levels of deposits as compared to the prior year. The net interest margin, on an FTE basis, declined to 1.04% from 1.09% in the prior-year period. Excluding the impairment, the net interest margin was 1.08%, reflecting lower yields on earning assets, partially offset by a lower cost of interest-related funds.

Provision for Credit Losses

The provision for credit losses was a credit of $14.5 million in the current-year period, compared to a provision of $3.0 million recorded in the prior-year period. Net charge-offs in the current-year period totaled $7.2 million resulting from $13.6 million of charge-offs and $6.4 million of recoveries, compared to net charge-offs of $7.4 million in the prior-year period resulting from $19.3 million of charge-offs and $11.9 million of recoveries. The current period provision reflects improved credit quality. Residential real estate loans continued to reflect weakness relative to the overall portfolio, accounting for 76% and 71% of total nonperforming loans and leases at June 30, 2015 and 2014, respectively. Loan balances within the private client, commercial and institutional and commercial real estate loan portfolios increased in the current period, while the residential real estate loan balance decreased. For a fuller discussion of the consolidated allowance and provision for credit losses refer to the “Asset Quality” section beginning on page 22.

18

SIX-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Expense

Noninterest expense totaled $1.64 billion for the current period, up $64.5 million, or 4%, compared to $1.58 billion in the prior-year period. The components of noninterest expense are provided below.

Table 19: Six Months Ended June 30 Noninterest Expense

Noninterest Expense	Six Months Ended June 30,
($ In Millions)	2015		2014		Change
Compensation	$	716.2	$	714.2	$	2.0		—	%
Employee Benefits		146.1		135.4		10.7		8
Outside Services		282.3		289.0		(6.7	)	(2	)
Equipment and Software		224.7		217.4		7.3		3
Occupancy		86.0		91.4		(5.4	)	(6	)
Other Operating Expense		188.2		131.6		56.6		43
Total Noninterest Expense	$	1,643.5	$	1,579.0	$	64.5		4	%

Compensation expense, the largest component of noninterest expense increased to $716.2 million from the prior-year period’s $714.2 million. The prior-year period included severance-related charges of $25.5 million. Excluding the severance-related charges, compensation expense increased $27.5 million, or 4%, reflecting higher performance- based compensation, staff levels and base pay adjustments, partially offset by favorable impact of movements in foreign exchange rates.

Employee benefit expense increased $10.7 million, or 8% to $146.1 million from $135.4 million in the prior-year period. The prior-year period included $1.9 million of severance-related charges. Excluding these charges, employee benefit expense increased $12.6 million, or 9%, primarily attributable to higher pension and employee medical expense.

Outside services expense equaled $282.3 million, down $6.7 million, or 2%, from $289.0 million in the prior-year period. In the prior-year period, outside services expense included $1.1 million of severance-related charges. Excluding these charges, outside services expense decreased $5.6 million, or 2%, primarily reflecting lower legal, third-party advisor fees, consulting and sub-custodian expense, partially offset by higher technical services.

Equipment and software expense totaled $224.7 million, up $7.3 million, or 3% from $217.4 million in the prior-year period. The prior-year period included $9.5 million of write-offs of replaced or eliminated software. Excluding these write-offs, equipment and software expense increased $16.8 million, or 8%, reflecting higher software amortization.

Occupancy expense equaled $86.0 million, down $5.4 million, or 6%, from $91.4 million in the prior-year period. The prior-year period included charges totaling $4.3 million in connection with reductions in office space. Excluding these charges, occupancy expense was relatively unchanged from the prior-year period.

19

SIX-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Expense (continued)

The components of other operating expense are provided below.

Table 20: Six Months Ended June 30 Other Operating Expense

Other Operating Expense	Six Months Ended June 30,
($ In Millions)	2015		2014		Change
Business Promotion	$	49.1	$	47.5	$	1.6		3	%
Staff Related		19.1		19.5		(0.4	)	(2	)
FDIC Insurance Premiums		11.6		10.6		1.0		9
Other Intangibles Amortization		6.7		9.9		(3.2	)	(32	)
Other Expenses		101.7		44.1		57.6		131
Total Other Operating Expense	$	188.2	$	131.6	$	56.6		43	%

Other operating expense totaled $188.2 million, up $56.6 million, or 43%, from $131.6 million in the prior-year period. The current-year period other expenses includes a charge related to voluntary cash contributions to certain constant dollar NAV funds totaling $45.8 million. Excluding the current-period charge, other operating expense increased $10.8 million, or 8%, reflecting higher charitable contributions and charges associated with account servicing activities.

Provision for Income Taxes

Income tax expense was $261.5 million for the six months ended June 30, 2015, representing an effective tax rate of 34.4%. The provision for income taxes was $176.9 million for the six months ended June 30, 2014, representing an effective tax rate of 32.8%.

CONSOLIDATED BALANCE SHEETS

Total assets were $119.9 billion and $109.9 billion at June 30, 2015, and December 31, 2014, respectively, and averaged $111.7 billion in the current quarter compared with $103.3 billion in the quarter ended June 30, 2014. Average balances are considered to be a better measure of balance sheet trends, as period-end balances can be impacted by deposit and withdrawal activity involving large client balances. Loans and leases totaled $33.0 billion and $31.6 billion at June 30, 2015, and December 31, 2014, respectively, and averaged $32.9 billion in the current quarter, up 10% from $30.1 billion in the quarter ended June 30, 2014. Securities, inclusive of Federal Reserve stock, Federal Home Loan Bank stock, and certain community development investments, which are classified in other assets in the consolidated balance sheets, totaled $39.2 billion and $34.2 billion at June 30, 2015, and December 31, 2014, respectively, and averaged $37.9 billion for the current quarter, up 11% from $34.3 billion in the quarter ended June 30, 2014. In aggregate, the categories of federal funds sold and securities purchased under agreements to resell, interest-bearing due from and deposits with banks, and Federal Reserve deposits totaled $37.4 billion and $35.1 billion at June 30, 2015, and December 31, 2014, respectively, and averaged $33.0 billion in the current quarter, up 6% from the quarter ended June 30, 2014 balances, primarily reflecting increased Federal Reserve deposits and federal funds sold and securities purchased under agreements to resell. Interest-bearing client deposits at June 30, 2015, and December 31, 2014, totaled $70.2 billion and $65.2 billion, respectively, and averaged $66.8 billion in the current quarter, up 1% compared to $65.8 billion in the quarter ended June 30, 2014. Noninterest-bearing client deposits at June 30, 2015, and December 31, 2014, totaled $30.5 billion and $25.5 billion, respectively, and averaged $25.6 billion in the current quarter, up 36% from $18.8 billion in the quarter ended June 30, 2014.

20

CONSOLIDATED BALANCE SHEETS (continued)

Total stockholders’ equity at June 30, 2015, was $8.7 billion compared to $8.4 billion at December 31, 2014, and averaged $8.6 billion for the current quarter, up 8% from $7.9 billion for the quarter ended June 30, 2014. The increase in average stockholders’ equity compared to the prior-year quarter was primarily attributable to earnings and the issuance of preferred stock in August 2014, partially offset by dividend declarations and the repurchase of common stock pursuant to the Corporation’s share repurchase program.

During the three and six months ended June 30, 2015, the Corporation declared cash dividends $85.3 million and $163.8 million to common stockholders, and cash dividends totaling $5.8 million and $11.7 million to preferred stockholders, respectively. During the three and six months ended June 30, 2015, the Corporation repurchased 1,295,263 shares of common stock at a cost of $96.7 million ($74.64 average price per share) and 2,851,133 shares at a cost of $203.9 million ($71.52 average price per share), respectively.

CAPITAL RATIOS

The capital ratios of the Corporation and the Bank remained strong at June 30, 2015, with all ratios applicable to classification as “well-capitalized” under U.S. regulatory requirements having been exceeded.

The table below provides capital ratios for Northern Trust Corporation and The Northern Trust Company determined by Basel III phased-in requirements.

Table 21: Regulatory Capital Ratios

Capital Ratios — Northern Trust Corporation	June 30, 2015						March 31, 2015						June 30, 2014
	Advanced Approach			Standardized Approach (a)			Advanced Approach			Standardized Approach (a)			Advanced Approach			Standardized Approach (a)
Common Equity Tier 1		12.0	%		10.7	%		11.8	%		10.5	%		12.7	%		12.7	%
Tier 1		12.6	%		11.2	%		12.4	%		11.1	%		12.9	%		12.9	%
Total		14.4	%		13.2	%		14.2	%		13.1	%		14.9	%		15.4	%
Tier 1 Leverage		7.6	%		7.6	%		7.8	%		7.8	%		n/a			7.6	%
Supplementary Leverage (b)		6.3	%		n/a			6.4	%		n/a			n/a			n/a

Capital Ratios — The Northern Trust Company	June 30, 2015						March 31, 2015						June 30, 2014
	Advanced Approach			Standardized Approach (a)			Advanced Approach			Standardized Approach (a)			Advanced Approach			Standardized Approach (a)
Common Equity Tier 1		11.6	%		10.1	%		11.3	%		10.0	%		11.7	%		11.4	%
Tier 1		11.6	%		10.1	%		11.3	%		10.0	%		11.6	%		11.4	%
Total		13.2	%		11.9	%		13.0	%		11.8	%		13.7	%		14.0	%
Tier 1 Leverage		6.8	%		6.8	%		6.9	%		6.9	%		n/a			6.7	%
Supplementary Leverage (b)		5.6	%		n/a			5.7	%		n/a			n/a			n/a

(a) In 2014, Standardized Approach risk-weighted assets were determined by Basel I requirements. Effective with the first quarter of 2015, risk-weighted assets are calculated in accordance with the Basel III Standardized Approach final rules.

(b) Beginning with the first quarter of 2015, advanced approaches banking organizations must calculate and report their supplementary leverage ratio. Effective January 1, 2018, advanced approaches institutions, such as the Corporation, will be subject to a minimum supplementary leverage ratio of 3 percent.

21

STATEMENTS OF CASH FLOWS

Net cash provided by operating activities of $1.5 billion for the six months ended June 30, 2015, was primarily attributable to a reduction of net collateral deposited with counterparties, as well as earnings, including the impact of non-cash charges such as amortization of computer software, partially offset by increased other operating activities. Net cash provided by operating activities of $1.5 billion for the six months ended June 30, 2014, was primarily attributable to a reduction of net collateral deposited with counterparties, as well as earnings, including the impact of non-cash charges such as amortization of computer software, and decreased receivables.

Net cash used in investing activities of $7.7 billion for the six months ended June 30, 2015, was primarily attributable to net purchases of securities held to maturity and available for sale, as well as increased loans and leases, interest-bearing deposits with banks, and client security settlement receivables, partially offset by decreases within other investing activities.

Net cash used in investing activities of $3.1 billion for the six months ended June 30, 2014, was primarily attributable to net purchases of securities held to maturity and available for sale, as well as increased loans and leases, partially offset by decreases within interest-bearing deposits with banks.

For the six months ended June 30, 2015, net cash provided by financing activities totaled $10.2 billion, primarily reflecting increased levels of total deposits and increased short-term other borrowings, partially offset by lower securities sold under agreements to repurchase and federal funds purchased. The increase in total deposits is attributable to higher levels of interest-bearing and noninterest-bearing non-U.S. office client and demand and other noninterest-bearing client deposits.

For the six months ended June 30, 2014, net cash provided by financing activities totaled $2.2 billion, primarily reflecting increased levels of total deposits, partially offset by lower levels of short-term other borrowings and senior notes. The increase in the level of total deposits was attributable to increases in demand and other noninterest-bearing client deposits and non-U.S. office interest-bearing deposits. The decreases in short-term other borrowings and senior notes, respectively, reflect a decline in outstanding short-term borrowings from the Federal Home Loan Bank and the maturity of $500 million of fixed-rate senior notes during the prior-year quarter.

ASSET QUALITY

Securities Portfolio

Northern Trust maintains a high quality securities portfolio, with 80% of the combined available for sale, held to maturity, and trading account portfolios at June 30, 2015, comprised of U.S. Treasury and government sponsored agency securities and triple-A rated corporate notes, asset-backed securities, covered bonds, sub-sovereign, supranational, sovereign and non-U.S. agency bonds, auction rate securities, commercial mortgage-backed securties and obligations of states and political subdivisions. The remaining portfolio was comprised of corporate notes, asset-backed securities, negotiable certificates of deposit, obligations of states and political subdivisions, auction rate securities and other securities, of which as a percentage of the total securities portfolio, 5% was rated double-A, 3% was rated below double-A, and 12% was not rated by Standard and Poor’s or Moody’s Investors Service (primarily negotiable certificates of deposits of banks whose long term ratings are at least A).

Net unrealized gains within the investment securities portfolio totaled $90.7 million at June 30, 2015, comprised of $153.5 million and $62.8 million of gross unrealized gains and losses, respectively. Of the unrealized losses on securities at June 30, 2015, the largest component was $23.8 million of unrealized losses in securities classified as “other,” related to securities primarily purchased at a premium or par by Northern Trust for compliance with the Community Reinvestment Act (CRA). Unrealized losses on these CRA-related securities were attributable to yields that are below market rates for the purpose of supporting institutions and programs that benefit low- to moderate- income communities within Northern Trust’s market area. Also, $19.1 million of

22

ASSET QUALITY (continued)

Securities Portfolio (continued)

the unrealized losses related to corporate debt securities, primarily reflecting higher market rates since purchase; 37% of the corporate debt portfolio is backed by guarantees provided by U.S. and non-U.S. governmental entities. Unrealized losses of $16.1 million related to government sponsored agency securities were primarily attributable to changes in market rates since their purchase.

There were no other-than-temporary impairment (OTTI) losses for the six months ended June 30, 2015. For the six months ended June 30, 2014, charges of $3.9 million were recorded relating to OTTI of certain CRA-eligible securities. Northern Trust has evaluated all securities with unrealized losses for possible OTTI in accordance with GAAP and Northern Trust’s security impairment review policy.

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.

Nonperforming Loans and Other Real Estate Owned

Nonperforming assets consist of nonperforming loans 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 nonperforming loans, 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. The balance of loans delinquent 90 days or more and still accruing interest can fluctuate widely based on the timing of cash collections, renegotiations and renewals.

Table 22: Nonperforming Assets

($ In Millions)	June 30, 2015			March 31, 2015			June 30, 2014
Nonperforming Loans and Leases
Commercial
Commercial and Institutional	$	23.4		$	20.9		$	20.8
Commercial Real Estate		26.0			39.9			45.4
Total Commercial		49.4			60.8			66.2
Personal
Residential Real Estate		158.2			157.7			161.7
Private Client		1.1			1.1			1.4
Total Personal		159.3			158.8			163.1
Total Nonperforming Loans and Leases		208.7			219.6			229.3
Other Real Estate Owned		10.1			8.5			12.6
Total Nonperforming Assets		218.8			228.1			241.9
90 Day Past Due Loans Still Accruing	$	14.9		$	9.4		$	13.1
Nonperforming Loans and Leases to Total Loans and Leases		0.63	%		0.67	%		0.75	%
Coverage of Loan and Lease Allowance to Nonperforming Loans and Leases		1.2x			1.2x			1.2x

23

ASSET QUALITY (continued)

Nonperforming Loans and Other Real Estate Owned (continued)

Nonperforming assets of $218.8 million as of June 30, 2015, reflected improved credit quality from the prior year, though they remained elevated from levels preceding the economic downturn in 2008 and its impact on residential property valuations and general economic conditions. The loan portfolio in the current quarter reflected improvement in the credit quality of the commercial and institutional, commercial real estate and private client loan classes. In addition to the negative impact on net interest income and the risk of credit losses, nonperforming assets also increase operating costs due to the expense associated with collection efforts. Changes in the level of nonperforming 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 specific allowance and of the qualitative factors used in the determination of the inherent allowance levels within the allowance for credit losses.

Northern Trust’s underwriting standards do not allow for the origination of loan types generally considered to be of high risk in nature, such as option adjustable rate mortgages, 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 loan-to-collateral values of no more than 65% to 80% at inception. Revaluations of supporting collateral are obtained upon refinancing or default or when otherwise considered warranted. Collateral revaluations for mortgages are performed by independent third parties.

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

Provision and Allowance for Credit Losses

The provision for credit losses 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 probable credit losses that have been identified with specific borrower relationships (specific loss component) and for probable losses that are believed to be inherent in the loan and lease portfolios, undrawn commitments and standby letters of credit (inherent loss component). Control processes and analyses employed to evaluate the appropriateness of the allowance for credit losses are reviewed on at least an annual basis and modified as considered necessary.

The amount of specific allowance is determined through an individual evaluation of loans and lending-related commitments considered impaired that is based on expected future cash flows, collateral value and other factors that may impact the borrower’s ability to pay. Changes in collateral values, delinquency ratios, portfolio volume and concentration and other asset quality metrics, including management’s subjective evaluation of economic and business conditions, result in adjustments of qualitative allowance factors that are applied in the determination of inherent allowance requirements.

The provision for credit losses was a credit of $10.0 million in the current quarter, compared to no provision in the prior-year quarter. Net charge-offs were $2.6 million, resulting from $6.1 million of charge-offs and $3.5 million of recoveries, compared to $5.9 million of net charge-offs in the prior-year quarter, resulting from $7.8 million of charge-offs and $1.9 million of recoveries. Residential real estate loans accounted for 76% and 71% of total nonperforming loans and leases at June 30, 2015, and 2014, respectively.

Note 7 to the consolidated financial statements includes a table that details the changes in the allowance for credit losses during the three and six months ended June 30, 2015, and 2014 due to charge-offs, recoveries and provisions for credit losses.

24

ASSET QUALITY (continued)

Provision and Allowance for Credit Losses (continued)

The following table shows the specific portion of the allowance and the inherent portion of the allowance and its components by loan and lease segment and class.

Table 23: Allocation of the Allowance for Credit Losses

	June 30, 2015						March 31, 2015						June 30, 2014
($ In Millions)	Allowance Amount			Percent of Loans to Total Loans			Allowance Amount			Percent of Loans to Total Loans			Allowance Amount			Percent of Loans to Total Loans
Specific Allowance	$	15.3			—	%	$	22.9			—	%	$	23.8			—	%
Allocated Inherent Allowance
Commercial
Commercial and Institutional		66.7			27			70.3			28			71.4			26
Commercial Real Estate		67.8			11			66.6			11			69.3			10
Lease Financing, net		3.6			3			3.2			3			3.4			3
Non-U.S.		2.2			5			2.8			5			2.7			4
Other		—			1			—			1			—			2
Total Commercial		140.3			47			142.9			48			146.8			45
Personal
Residential Real Estate		99.2			28			102.4			29			114.6			33
Private Client		19.4			25			18.5			23			18.3			22
Other		—			—			—			—			—			—
Total Personal		118.6			53			120.9			52			132.9			55
Total Allocated Inherent Allowance	$	258.9			100	%	$	263.8			100	%	$	279.7			100	%
Total Allowance for Credit Losses	$	274.2					$	286.7					$	303.5
Allowance Assigned to
Loans and Leases	$	257.3					$	259.0					$	275.2
Undrawn Commitments and Standby Letters of Credit		16.9						27.7						28.3
Total Allowance for Credit Losses	$	274.2					$	286.7					$	303.5
Allowance Assigned to Loans and Leases to Total Loans and Leases		0.78	%					0.79	%					0.90	%

MARKET RISK MANAGEMENT

Northern Trust faces two primary types of market risk through its business operations: interest rate risk, which is the potential for movements in interest rates to cause changes in earnings and the economic value of equity; and trading risk, which is the potential for movements in market variables such as foreign exchange rates and interest rates to cause changes in the value of trading positions.

Northern Trust uses two primary measurement techniques to manage interest rate risk: sensitivity of earnings (SOE) and sensitivity of economic value of equity (SEVE). SOE provides management with a short-term view of the impact of interest rate changes on future earnings. SEVE provides management with a long-term view of interest rate changes on the economic value of equity as of the period-end balance sheet. Both simulation models use the same initial market interest rates and product balances. These two techniques, which are performed monthly, are complementary and are used in concert to provide a comprehensive interest rate risk management capability.

25

MARKET RISK MANAGEMENT (continued)

As part of its risk management activities, Northern Trust also regularly measures the risk of loss associated with foreign currency positions using a Value-at-Risk (VaR) model. The following 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, 2014.

Sensitivity of Earnings — The modeling of SOE 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) in earnings if future rates are 100 or 200 basis points higher than base case forward rates. The following table shows the estimated impact on the next twelve months of pre-tax earnings of 100 and 200 basis point upward movements in interest rates relative to forward rates. Given the low level of interest rates, the simulation of earnings for rates 100 and 200 basis points lower would not provide meaningful results.

Table 24: Sensitivity of Earnings to Changes in Interest Rates

($ In Millions)	Increase/(Decrease) Estimated Impact on Next Twelve Months of Pre-Tax Earnings
Increase in Interest Rates Above Market-Implied Forward Rates
100 Basis Points	$	8
200 Basis Points	$	(21	)

The simulations of earnings incorporate several assumptions but do not incorporate any management actions that may be used to mitigate negative consequences of actual interest rate movements. For that reason and others, they do not reflect the likely actual results but serve as conservative estimates of interest rate risk. SOE is not directly comparable to actual results disclosed elsewhere or directly predictive of future values of other measures provided.

Sensitivity of Economic Value of Equity — Economic value of equity is defined as the present value of assets minus the present value of liabilities, net of the value of instruments that are used to manage the interest rate risk of balance sheet items. The potential effect of interest rate changes on economic equity 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 the sensitivity (i.e. change) if current rates are immediately shocked up by 100 or 200 basis points. The following table shows the estimated impact on economic value of equity of 100 and 200 basis point shocks up from current interest rates. Given the low level of interest rates and assumed interest rate floors as rates approach zero, the simulation of the economic value of equity for rates 100 or 200 basis points lower would not provide meaningful results.

Table 25: Sensitivity of Economic Value of Equity to Changes in Interest Rates as of June 30, 2015

($ In Millions)	Increase/(Decrease) Estimated Impact on Economic Value of Equity
Increase in Interest Rates Above Market Rates
100 Basis Points	$	(116	)
200 Basis Points	$	(436	)

The simulations of economic value of equity incorporate several assumptions but do not incorporate any management actions that may be used to mitigate negative consequences of actual interest rate movements. For that reason and others, they do not reflect the likely actual results but serve as conservative estimates of interest rate risk. SEVE is not directly comparable to actual results disclosed elsewhere or directly predictive of future values of other measures provided.

26

MARKET RISK MANAGEMENT (continued)

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 foreign exchange VaR measures to meet specific regulatory and internal management needs. Variations include different methodologies (historical, variance-covariance and Monte Carlo), equally-weighted and exponentially-weighted volatilities, horizons of one day and ten days, confidence levels ranging from 95% to 99.95% and look-back periods of one year and four years. The table below presents the levels of total regulatory VaR and its subcomponents for global foreign currency as June 30, 2015, and March 31, 2015, based on the historical simulation methodology, a 99% confidence level, a one-day horizon and equally-weighted volatility. The total VaR for foreign currency is typically less than the sum of its two components due to diversification benefits derived from the two subcomponents.

Table 26: Foreign Currency Value-At-Risk

	Total VaR (Spot and Forward)				Foreign Exchange Spot VaR				Foreign Exchange Forward VaR
($ In Millions)	June 30, 2015		March 31, 2015		June 30, 2015		March 31, 2015		June 30, 2015		March 31 2015
High	$	0.7	$	0.4	$	0.7	$	0.4	$	0.2	$	0.2
Low		0.1		0.1		—		—		0.1		0.1
Average		0.2		0.2		0.1		0.1		0.1		0.1
Quarter-End		0.3		0.4		0.2		0.4		0.2		0.2

RECONCILIATION OF CERTAIN REPORTED ITEMS TO FULLY TAXABLE EQUIVALENTS

The tables below present a reconciliation of interest income, net interest income and net interest margin prepared in accordance with GAAP to interest income, net interest income and net interest margin on an FTE basis, which are non-GAAP financial measures. Management believes an FTE presentation facilitates the analysis of asset yields and provides a clearer indication of net interest margins for comparative purposes.

Table 27: Reconciliation of Reported Net Interest Income to Fully Taxable Equivalent

	Three Months Ended
	June 30, 2015								June 30, 2014
($ In Millions)	Reported			FTE Adj.		FTE			Reported			FTE Adj.		FTE
Interest Income	$	288.8		$	6.4	$	295.2		$	293.8		$	6.8	$	300.6
Interest Expense		37.6			—		37.6			47.2			—		47.2
Net Interest Income	$	251.2		$	6.4	$	257.6		$	246.6		$	6.8	$	253.4
Net Interest Margin		0.97	%				1.00	%		1.04	%				1.06	%

	Six Months Ended
	June 30, 2015								June 30, 2014
($ In Millions)	Reported			FTE Adj.		FTE			Reported			FTE Adj.		FTE
Interest Income	$	587.6		$	12.6	$	600.2		$	589.2		$	15.5	$	604.7
Interest Expense		75.8			—		75.8			96.9			—		96.9
Net Interest Income	$	511.8		$	12.6	$	524.4		$	492.3		$	15.5	$	507.8
Net Interest Margin		1.02	%				1.04	%		1.06	%				1.09	%

27

FORWARD-LOOKING STATEMENTS

This report contains statements that are forward-looking, such as statements concerning Northern Trust’s financial goals, capital adequacy, dividend policy, risk management policies, litigation-related matters and contingent liabilities, accounting estimates and assumptions, industry trends, strategic initiatives, credit quality including allowance levels, planned capital expenditures and technology spending, anticipated expense levels, future pension plan contributions, anticipated tax benefits and expenses, the impact of recent legislation and accounting pronouncements, and all other statements that do not relate to historical facts. Forward-looking statements are typically identified 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 are Northern Trust’s current estimates or expectations of future events or future results and involve risks and uncertainties that are difficult to predict. Actual results could differ materially from the results indicated by these statements because the realization of those results is subject to many risks and uncertainties including:

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

• financial market disruptions or economic recession, whether in the United States, Europe, the Middle East, Asia Pacific or other regions;

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

• 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 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 stress in the financial markets, the effectiveness of governmental actions taken in response, and the effect of such governmental actions on Northern Trust, its competitors and counterparties, financial markets generally and availability of credit specifically, and the U.S. and international economies;

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

• changes in foreign exchange trading client volumes and volatility in foreign currency exchange rates, and Northern Trust’s success in assessing and mitigating the risks arising from 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;

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

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

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

• regulatory and monetary policy developments;

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

28

FORWARD-LOOKING STATEMENTS (continued)

• 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;

• 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;

• the impact of equity markets on fee revenue;

• 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;

• 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 controlling expenses and implementing revenue enhancement initiatives;

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

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

• Northern Trust’s success in improving 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;

• 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 client privacy;

• the potential for substantial changes in the legal, regulatory and enforcement framework and oversight applicable to financial institutions, including changes that may affect leverage limits and risk-based capital and liquidity requirements, require financial institutions to pay higher assessments, expose financial institutions to certain liabilities of their subsidiary depository institutions, and restrict or increase the regulation of certain activities, including foreign exchange, carried on by financial institutions, including Northern Trust;

• risks and uncertainties inherent in the litigation and regulatory process, including the adequacy of contingent liability, tax, and other accruals;

• 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, 2014, 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.

29

FORWARD-LOOKING STATEMENTS (continued)

Actual results may differ materially from those expressed or implied by the 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.

30

Item 1. Financial Statements

CONSOLIDATED BALANCE SHEETS NORTHERN TRUST CORPORATION

(In Millions Except Share Information)	June 30, 2015			December 31, 2014
	(Unaudited)
Assets
Cash and Due from Banks	$	7,152.9		$	3,050.6
Federal Funds Sold and Securities Purchased under Agreements to Resell		1,020.0			1,062.7
Interest-Bearing Deposits with Banks		15,650.3			14,928.3
Federal Reserve Deposits		17,488.7			17,386.3
Securities
Available for Sale		31,835.6			29,558.5
Held to Maturity (Fair value of $6,986.4 and $4,176.1)		6,990.8			4,170.8
Trading Account		1.2			4.7
Total Securities		38,827.6			33,734.0
Loans and Leases
Commercial		15,304.9			14,353.6
Personal		17,648.9			17,286.6
Total Loans and Leases (Net of unearned income of $255.2 and $287.7)		32,953.8			31,640.2
Allowance for Credit Losses Assigned to Loans and Leases		(257.3	)		(267.0	)
Buildings and Equipment		436.5			444.3
Client Security Settlement Receivables		2,034.2			1,568.8
Goodwill		534.3			533.2
Other Assets		4,101.9			5,865.1
Total Assets	$	119,942.9		$	109,946.5
Liabilities
Deposits
Demand and Other Noninterest-Bearing	$	25,688.8		$	22,815.0
Savings and Money Market		15,782.4			15,916.4
Savings Certificates and Other Time		1,540.5			1,757.4
Non U.S. Offices — Noninterest-Bearing		4,766.3			2,723.2
— Interest-Bearing		52,909.9			47,545.0
Total Deposits		100,687.9			90,757.0
Federal Funds Purchased		351.3			932.9
Securities Sold Under Agreements to Repurchase		29.8			885.1
Other Borrowings		3,322.9			1,685.2
Senior Notes		1,497.2			1,497.0
Long-Term Debt		1,362.3			1,615.1
Floating Rate Capital Debt		277.3			277.2
Other Liabilities		3,664.9			3,848.1
Total Liabilities		111,193.6			101,497.6
Stockholders’ Equity
Preferred Stock, No Par Value; Authorized 10,000,000 shares:
Series C, outstanding shares of 16,000		388.5			388.5
Common Stock, $1.66 2/3 Par Value; Authorized 560,000,000 shares;
Outstanding shares of 232,852,813 and 233,390,705		408.6			408.6
Additional Paid-In Capital		1,044.6			1,050.9
Retained Earnings		7,949.8			7,625.4
Accumulated Other Comprehensive Loss		(273.7	)		(319.7	)
Treasury Stock (12,318,711 and 11,780,819 shares, at cost)		(768.5	)		(704.8	)
Total Stockholders’ Equity		8,749.3			8,448.9
Total Liabilities and Stockholders’ Equity	$	119,942.9		$	109,946.5

See accompanying notes to the consolidated financial statements.

31

CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) NORTHERN TRUST CORPORATION

	Three Months Ended June 30,					Six Months Ended June 30,
(In Millions Except Share Information)	2015			2014		2015			2014
Noninterest Income
Trust, Investment and Other Servicing Fees	$	756.8		$	706.9	$	1,484.3		$	1,386.4
Foreign Exchange Trading Income		74.8			52.9		146.4			103.0
Treasury Management Fees		16.1			16.6		32.4			33.4
Security Commissions and Trading Income		20.0			17.8		39.8			32.5
Other Operating Income		137.4			40.5		176.0			78.2
Investment Security Gains (Losses), net (Note)		(0.4	)		0.4		(0.3	)		(3.6	)
Total Noninterest Income		1,004.7			835.1		1,878.6			1,629.9
Net Interest Income
Interest Income		288.8			293.8		587.6			589.2
Interest Expense		37.6			47.2		75.8			96.9
Net Interest Income		251.2			246.6		511.8			492.3
Provision for Credit Losses		(10.0	)		—		(14.5	)		3.0
Net Interest Income after Provision for Credit Losses		261.2			246.6		526.3			489.3
Noninterest Expense
Compensation		361.9			372.4		716.2			714.2
Employee Benefits		73.2			68.5		146.1			135.4
Outside Services		147.2			144.6		282.3			289.0
Equipment and Software		114.4			116.1		224.7			217.4
Occupancy		43.0			47.2		86.0			91.4
Other Operating Expense		114.8			62.2		188.2			131.6
Total Noninterest Expense		854.5			811.0		1,643.5			1,579.0
Income before Income Taxes		411.4			270.7		761.4			540.2
Provision for Income Taxes		142.2			88.8		261.5			176.9
Net Income	$	269.2		$	181.9	$	499.9		$	363.3
Preferred Stock Dividends		5.8			—		11.7		$	—
Net Income Applicable to Common Stock	$	263.4		$	181.9	$	488.2		$	363.3
Per Common Share
Net Income — Basic	$	1.11		$	0.76	$	2.06		$	1.51
— Diluted		1.10			0.75		2.04			1.50
Average Number of Common Shares Outstanding                      — Basic		233,149,020			236,012,703		233,264,453			236,607,125
— Diluted		235,232,835			237,753,679		235,260,611			238,398,614

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) NORTHERN TRUST CORPORATION

	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2015			2014			2015			2014
Net Income	$	269.2		$	181.9		$	499.9		$	363.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)
Net Unrealized Gains (Losses) on Securities Available for Sale		(22.4	)		33.5			31.7			38.0
Net Unrealized Gains (Losses) on Cash Flow Hedges		3.2			(0.6	)		2.1			1.0
Foreign Currency Translation Adjustments		5.8			(5.6	)		(0.1	)		(6.9	)
Pension and Other Postretirement Benefit Adjustments		6.1			3.6			12.3			7.0
Other Comprehensive Income (Loss)		(7.3	)		30.9			46.0			39.1
Comprehensive Income	$	261.9		$	212.8		$	545.9		$	402.4
Note: Changes in Other-Than-Temporary-Impairment (OTTI) Losses	$	—		$	—		$	—		$	(4.6	)
Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI		—			—			—			0.7
Other Security Gains (Losses), net		(0.4	)		0.4			(0.3	)		0.3
Investment Security Gains (Losses), net	$	(0.4	)	$	0.4		$	(0.3	)	$	(3.6	)

See accompanying notes to the consolidated financial statements.

32

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

	Six Months Ended June 30,
(In Millions)	2015			2014
Preferred Stock
Balance at January 1 and June 30	$	388.5		$	—
Issuance of Preferred Stock, Series C		—			—
Balance at June 30	$	388.5		$	—
Common Stock
Balance at January 1 and June 30		408.6			408.6
Additional Paid-in Capital
Balance at January 1		1,050.9			1,035.7
Treasury Stock Transactions — Stock Options and Awards		(64.3	)		(47.1	)
Stock Options and Awards — Amortization		42.6			42.1
Stock Options and Awards — Tax Benefits		15.4			8.6
Balance at June 30		1,044.6			1,039.3
Retained Earnings
Balance at January 1		7,625.4			7,134.8
Net Income		499.9			363.3
Dividends Declared — Common Stock		(163.8	)		(154.0	)
Dividends Declared — Preferred Stock		(11.7	)		—
Balance at June 30		7,949.8			7,344.1
Accumulated Other Comprehensive Income (Loss)
Balance at January 1		(319.7	)		(244.3	)
Net Unrealized Gains (Losses) on Securities Available for Sale		31.7			38.0
Net Unrealized Gains (Losses) on Cash Flow Hedges		2.1			1.0
Foreign Currency Translation Adjustments		(0.1	)		(6.9	)
Pension and Other Postretirement Benefit Adjustments		12.3			7.0
Balance at June 30		(273.7	)		(205.2	)
Treasury Stock
Balance at January 1		(704.8	)		(422.8	)
Stock Options and Awards		140.2			116.5
Stock Purchased		(203.9	)		(237.9	)
Balance at June 30		(768.5	)		(544.2	)
Total Stockholders’ Equity at June 30	$	8,749.3		$	8,042.6

See accompanying notes to the consolidated financial statements.

33

CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) NORTHERN TRUST CORPORATION

	Six Months Ended June 30,
(In Millions)	2015			2014
Cash Flows from Operating Activities:
Net Income	$	499.9		$	363.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Investment Security Losses, net		0.3			3.6
Amortization and Accretion of Securities and Unearned Income, net		27.5			17.2
Provision for Credit Losses		(14.5	)		3.0
Depreciation on Buildings and Equipment		46.7			46.5
Amortization of Computer Software		126.6			113.0
Amortization of Intangibles		6.7			9.9
Pension Plan Contributions		(16.5	)		(13.9	)
Change in Receivables		(27.7	)		140.5
Change in Interest Payable		(8.8	)		(10.2	)
Change in Collateral With Derivative Counterparties, net		1,152.4			527.9
Other Operating Activities, net		(265.4	)		339.2
Net Cash Provided by Operating Activities		1,527.2			1,540.0
Cash Flows from Investing Activities:
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell		42.7			(49.9	)
Change in Interest-Bearing Deposits with Banks		(1,036.1	)		2,578.7
Net Change in Federal Reserve Deposits		(102.4	)		(427.0	)
Purchases of Securities — Held to Maturity		(4,712.9	)		(3,758.9	)
Proceeds from Maturity and Redemption of Securities — Held to Maturity		1,814.5			1,846.0
Purchases of Securities — Available for Sale		(5,507.2	)		(6,442.8	)
Proceeds from Sale, Maturity and Redemption of Securities — Available for Sale		3,237.4			5,185.3
Change in Loans and Leases		(1,328.4	)		(1,318.9	)
Purchases of Buildings and Equipment		(42.6	)		(32.4	)
Purchases and Development of Computer Software		(148.8	)		(159.6	)
Change in Client Security Settlement Receivables		(472.8	)		(234.0	)
Other Investing Activities, net		595.9			(271.1	)
Net Cash Used in Investing Activities		(7,660.7	)		(3,084.6	)
Cash Flows from Financing Activities:
Change in Deposits		10,491.8			4,468.0
Change in Federal Funds Purchased		(581.6	)		3.4
Change in Securities Sold under Agreements to Repurchase		(855.3	)		2.3
Change in Short-Term Other Borrowings		1,545.2			(1,644.8	)
Repayments of Senior Notes and Long-Term Debt		(228.4	)		(602.4	)
Contingent Consideration Liability Payment		—			(55.3	)
Treasury Stock Purchased		(203.9	)		(237.9	)
Net Proceeds from Stock Options		75.8			69.4
Cash Dividends Paid on Common Stock		(154.1	)		(149.9	)
Cash Dividends Paid on Preferred Stock		(15.3	)		—
Other Financing Activities, net		155.7			362.2
Net Cash Provided by Financing Activities		10,229.9			2,215.0
Effect of Foreign Currency Exchange Rates on Cash		5.9			112.4
Increase in Cash and Due from Banks		4,102.3			782.8
Cash and Due from Banks at Beginning of Year		3,050.6			3,162.4
Cash and Due from Banks at End of Period	$	7,152.9		$	3,945.2
Supplemental Disclosures of Cash Flow Information:
Interest Paid	$	85.6		$	108.4
Income Taxes Paid		224.1			74.1
Transfers from Loans to OREO		8.6			8.7

See accompanying notes to the consolidated financial statements.

34

Notes to Consolidated Financial Statements

1. Basis of Presentation — The consolidated financial statements include the accounts of Northern Trust Corporation (Corporation) and its subsidiaries (collectively, Northern Trust). Significant intercompany balances and transactions have been eliminated. The consolidated financial statements, as of and for the periods ended June 30, 2015 and 2014, 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 with U.S. generally accepted accounting principles (GAAP) and reporting practices prescribed by the banking industry. For a description of Northern Trust’s significant accounting policies, refer to Note 1 of the Notes to Consolidated Financial Statements in the Annual Report on Form 10-K for the year ended December 31, 2014.

2. Recent Accounting Pronouncements — In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, “Revenue from Contracts with Customers (Topic 606).” The ASU is a converged standard between the FASB and the International Accounting Standards Board (IASB) that provides a single comprehensive revenue recognition model for all contracts with customers across transactions and industries. The primary objective of the ASU is revenue recognition that represents the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU is effective for interim and annual reporting periods beginning after December 15, 2017. Northern Trust is currently assessing the impact of adoption of ASU 2014-09.

In February 2015, the FASB issued ASU No. 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis” which changes the guidance with respect to the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The amendments include: (1) modifying the evaluation of limited partnerships and similar legal entities, (2) amending when fees paid to a decision maker should be included in the variable interest entity analysis, (3) amending the related party relationship guidance, and (4) providing a scope exception from the consolidation guidance for reporting entities with interests in certain investment funds. The ASU is effective for interim and annual reporting periods beginning after December 15, 2015, although early adoption is permitted. Northern Trust is currently assessing the impact of adoption of ASU 2015-02.

In April 2015, the FASB issued ASU No. 2015-03, “Interest — Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs” which requires that debt issuance costs be presented in the balance sheet as a direct deduction to the carrying amount of the associated debt liability. The ASU is effective for interim and annual periods beginning after December 15, 2015, although early adoption is permitted. Northern Trust is currently assessing the impact of adoption of ASU 2015-03.

In April 2015, the FASB issued ASU No. 2015-05, “Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement” which clarifies whether fees paid by a customer in a cloud computing arrangement pertain to the acquisition of a software license, services, or both. The ASU is effective for interim and annual periods beginning after December 15, 2015, although early adoption is permitted. Northern Trust is currently assessing the impact of adoption of ASU 2015-05.

In May 2015, the FASB issued ASU No. 2015-07, “Fair Value Measurement (Topic 820) — Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share (or Its Equivalent)” which removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. Further, the ASU requires entities to provide certain disclosures only for investments for which they elect to use the net asset value practical expedient to determine fair value. The ASU is effective for interim and annual periods beginning after December 15, 2015, and will be applied retrospectively to all periods presented. Early adoption is permitted. Northern Trust is currently assessing the impact of adoption of ASU 2015-07.

35

Notes to Consolidated Financial Statements (continued)

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. Northern Trust’s policy is to recognize transfers into and transfers out of fair value levels as of the end of the reporting period in which the transfer occurred. No transfers between fair value levels occurred during the six months ended June 30, 2015 or the year ended December 31, 2014.

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 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 June 30, 2015, Northern Trust’s available for sale securities portfolio included 975 Level 2 securities with an aggregate market value of $26.8 billion. All 975 securities were valued by external pricing vendors. As of December 31, 2014, Northern Trust’s available for sale securities portfolio included 881 Level 2 securities with an aggregate market value of $25.0 billion. All 881 securities were valued by external pricing vendors. Trading account securities, which totaled $1.2 million and $4.7 million as of June 30, 2015, and December 31, 2014, respectively, were all valued using external pricing vendors.

Northern Trust has established processes and procedures to assess the suitability of valuation methodologies used by external pricing vendors, including reviews of valuation techniques and assumptions used for selected securities. On a daily basis, periodic quality control reviews of prices received from vendors are conducted which include comparisons to prices on similar security types received from multiple pricing vendors and to the previous day’s reported prices for each security. Predetermined tolerance level exceptions are researched and may result in additional validation through available market information or the use of an alternate pricing vendor. Quarterly, Northern Trust reviews documentation from third-party pricing vendors regarding the valuation processes and assumptions used in their valuations and assesses whether the fair value levels assigned by Northern Trust to each security classification are appropriate. Annually, valuation inputs used within third-party pricing vendor valuations are reviewed for propriety on a sample basis through a comparison of inputs used to comparable market data, including security classifications that are less actively traded and security classifications comprising significant portions of the portfolio.

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; 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

36

Notes to Consolidated Financial Statements (continued)

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 assets consist of auction rate securities purchased in 2008 from Northern Trust clients. To estimate the fair value of auction rate securities, for which trading is limited and market prices are generally unavailable, Northern Trust developed and maintains a pricing model that discounts estimated cash flows over their estimated remaining lives. Significant inputs to the model include the contractual terms of the securities, credit risk ratings, discount rates, forward interest rates, credit/liquidity spreads, and Northern Trust’s own assumptions about the estimated remaining lives of the securities. The significant unobservable inputs used in the fair value measurement are Northern Trust’s own assumptions about the estimated remaining lives of the securities and the applicable discount rates. Significant increases (decreases) in the estimated remaining lives or the discount rates in isolation would result in a significantly lower (higher) fair value measurement.

As of June 30, 2015, Northern Trust’s Level 3 liabilities consisted of a swap that Northern Trust entered into with the purchaser of 1.0 million shares of Visa Inc. Class B common stock (Visa Class B common shares) previously held by Northern Trust. Pursuant to the swap, 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 swap also requires 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 swap 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 Shares” under Note 19 — 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.

Management of various businesses and departments of Northern Trust (including Corporate Market Risk, Credit Risk Management, Corporate Financial Management, Corporate & Institutional Services (C&IS) and Wealth Management) determine the valuation policies and procedures for Level 3 assets and liabilities. Generally, valuation policies are reviewed by management of each business or department. Fair value measurements are performed upon acquisitions of an asset or liability. As necessary, the valuation models are reviewed by management of the appropriate business or department, and adjusted for changes in inputs. Management of each business or department reviews the inputs in order to substantiate the unobservable inputs used in each fair value measurement. When appropriate, management reviews forecasts used in the valuation process in light of other relevant financial projections to understand any variances between current and previous fair value measurements. In certain circumstances, third-party information is used to support the fair value measurements. If certain third-party information seems inconsistent with consensus views, a review of the information is performed by management of the respective business or department to conclude as to the appropriate fair value of the asset or liability.

37

Notes to Consolidated Financial Statements (continued)

The following presents the fair values of, and the valuation techniques, significant unobservable inputs, and quantitative information used to develop significant unobservable inputs for, Northern Trust’s Level 3 assets and liabilities as of June 30, 2015.

Table 28: Level 3 Significant Unobservable Inputs

Financial Instrument	Fair Value		Valuation Technique	Unobservable Inputs	Range of Lives and Rates
Auction Rate Securities	$	16.6 million	Discounted Cash Flow	Remaining lives Discount rates	0.9 — 8.6 years 0.1% — 8.1%
Swap Related to Sale of Certain Visa Class B Common Shares	$	11.3 million	Discounted Cash Flow	Visa Class A Appreciation Conversion Rate Expected Conversion Rate	10-15% 1.61x — 1.65x 2-5 years

38

Notes to Consolidated Financial Statements (continued)

The following tables present assets and liabilities measured at fair value on a recurring basis as of June 30, 2015 and December 31, 2014, segregated by fair value hierarchy level.

Table 29: Recurring Basis Hierarchy Leveling

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
June 30, 2015
Securities
Available for Sale
U.S. Government	$	5,018.8	$	—	$	—	$	—		$	5,018.8
Obligations of States and Political Subdivisions		—		4.5		—		—			4.5
Government Sponsored Agency		—		16,765.4		—		—			16,765.4
Non-U.S. Government		—		311.0		—		—			311.0
Corporate Debt		—		3,734.8		—		—			3,734.8
Covered Bonds		—		1,982.2		—		—			1,982.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		—		560.7		—		—			560.7
Other Asset-Backed		—		3,119.2		—		—			3,119.2
Auction Rate		—		—		16.6		—			16.6
Commercial Mortgage-Backed		—		198.7		—		—			198.7
Other		—		123.7		—		—			123.7
Total Available for Sale		5,018.8		26,800.2		16.6		—			31,835.6
Trading Account		—		1.2		—		—			1.2
Total Available for Sale and Trading Securities		5,018.8		26,801.4		16.6		—			31,836.8
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		2,482.1		—		—			2,482.1
Interest Rate Contracts		—		204.2		—		—			204.2
Total Derivative Assets		—		2,686.3		—		(1,698.0	)		988.3
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		2,475.4		—		—			2,475.4
Interest Rate Contracts		—		120.5		—		—			120.5
Other Financial Derivatives (1)		—		—		11.3		—			11.3
Total Derivative Liabilities	$	—	$	2,595.9	$	11.3	$	(1,461.8	)	$	1,145.4

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 June 30, 2015, derivative assets and liabilities shown above also include reductions of $387.9 million and $151.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(1) This line includes a swap related to the sale of certain Visa Class B common shares.

39

Notes to Consolidated Financial Statements (continued)

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
December 31, 2014
Securities
Available for Sale
U.S. Government	$	4,506.9	$	—	$	—	$	—		$	4,506.9
Obligations of States and Political Subdivisions		—		4.6		—		—			4.6
Government Sponsored Agency		—		16,389.2		—		—			16,389.2
Non-U.S. Government		—		310.4		—		—			310.4
Corporate Debt		—		3,577.7		—		—			3,577.7
Covered Bonds		—		1,907.5		—		—			1,907.5
Supranational and Non-U.S. Agency Bonds		—		360.6		—		—			360.6
Residential Mortgage-Backed		—		6.4		—		—			6.4
Other Asset-Backed		—		2,321.3		—		—			2,321.3
Auction Rate		—		—		18.1		—			18.1
Other		—		155.8		—		—			155.8
Total Available for Sale		4,506.9		25,033.5		18.1		—			29,558.5
Trading Account		—		4.7		—		—			4.7
Total Available for Sale and Trading Securities		4,506.9		25,038.2		18.1		—			29,563.2
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		4,275.2		—		—			4,275.2
Interest Rate Contracts		—		232.3		—		—			232.3
Total Derivative Assets		—		4,507.5		—		(2,257.1	)		2,250.4
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		4,095.5		—		—			4,095.5
Interest Rate Contracts		—		131.8		—		—			131.8
Total Derivative Liabilities	$	—	$	4,227.3	$	—	$	(3,173.3	)	$	1,054.0

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, 2014, derivative assets and liabilities shown above also include reductions of $315.8 million and $1.2 billion, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

40

Notes to Consolidated Financial Statements (continued)

The following tables present the changes in Level 3 assets and liabilities for the three and six months ended June 30, 2015, and 2014.

Table 30: Changes in Level 3 Assets

Level 3 Assets (In Millions)	Auction Rate Securities
Three Months Ended June 30,	2015			2014
Fair Value at April 1	$	17.5		$	98.5
Total Gains (Losses):
Included in Other Comprehensive Income (1)		0.5			0.5
Purchases, Issues, Sales, and Settlements
Sales		(1.2	)		—
Settlements		(0.2	)		(0.2	)
Fair Value at June 30	$	16.6		$	98.8
Six Months Ended June 30,	2015			2014
Fair Value at January 1	$	18.1		$	98.9
Total Gains (Losses):
Included in Other Comprehensive Income (1)		0.2			0.3
Purchases, Issues, Sales, and Settlements
Sales		(1.2	)		0.1
Settlements		(0.5	)		(0.5	)
Fair Value at June 30	$	16.6		$	98.8

(1) Unrealized gains (losses) are included in net unrealized gains (losses) on securities available for sale in the consolidated statements of comprehensive income.

Table 31: Changes in Level 3 Liabilities

Level 3 Liabilities (In Millions)	Contingent Consideration					Swap Related to Sale of Certain Visa Class B Common Shares
Three Months Ended June 30,	2015		2014			2015		2014
Fair Value at April 1	$	—	$	—		$	—	$	—
Total (Gains) Losses:
Included in Earnings (1)		—		—			11.3		—
Included in Other Comprehensive Income		—		—			—		—
Purchases, Issues, Sales, and Settlements
Purchases		—		—			—		—
Settlements		—		—			—		—
Fair Value at June 30	$	—	$	—		$	11.3	$	—
Six Months Ended June 30,	2015		2014			2015		2014
Fair Value at January 1	$	—	$	55.4		$	—	$	—
Total (Gains) Losses:
Included in Earnings (1)		—		(0.1	)		11.3		—
Included in Other Comprehensive Income		—		—			—		—
Purchases, Issues, Sales, and Settlements
Purchases		—		—			—		—
Settlements		—		(55.3	)		—		—
Fair Value at June 30	$	—	$	—		$	11.3	$	—

(1) (Gains) losses are recorded in other operating income (expense) in the consolidated statements of income.

41

Notes to Consolidated Financial Statements (continued)

During the six months ended June 30, 2015 and 2014, there were no transfers into or out of Level 3 assets or liabilities.

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 disclose separately these subsequent fair value measurements and to classify them under the fair value hierarchy.

Assets measured at fair value on a nonrecurring basis at June 30, 2015, and 2014, all of which were categorized as Level 3 under the fair value hierarchy, were comprised of impaired 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, and were subject to adjustments to reflect management’s judgment as to realizable value. 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 impaired loans and OREO assets that have been adjusted to fair value totaled $20.9 million and $0.3 million, respectively, at June 30, 2015, and $16.9 million and $1.4 million, respectively, at June 30, 2014. Assets measured at fair value on a nonrecurring basis reflect management’s judgment as to realizable value.

The following table provides the fair value of, and the valuation technique, significant unobservable inputs and quantitative information used to develop the significant unobservable inputs for, Northern Trust’s Level 3 assets that were measured at fair value on a nonrecurring basis as of June 30, 2015.

Table 32: Level 3 Nonrecurring Basis Significant Unobservable Inputs

Financial Instrument	Fair Value	Valuation Technique	Unobservable Input	Range of Discounts Applied
Loans	$20.9 million	Market Approach	Discount to reflect realizable value	15% — 25%
OREO	$0.3 million	Market Approach	Discount to reflect realizable value	15% — 20%

Fair Value of Financial Instruments. GAAP requires disclosure of the estimated fair value of certain financial instruments and the methods and significant assumptions used to estimate fair value. It excludes from this requirement nonfinancial assets and liabilities, as well as a wide range of franchise, relationship and intangible values that add value to Northern Trust. Accordingly, the required fair value disclosures provide only a partial estimate of the fair value of Northern Trust. Financial instruments recorded at fair value in Northern Trust’s consolidated balance sheets are discussed above. The following methods and assumptions were used in estimating the fair values of financial instruments that are not carried at fair value.

Held to Maturity Securities. The fair values of held to maturity securities were modeled by external pricing vendors, or in limited cases internally, using widely accepted models which are based on an income approach (discounted cash flow) that incorporates current market yield curves.

Loans (excluding lease receivables). The fair value of the loan portfolio was estimated using an income approach (discounted cash flow) that incorporates current market rates offered by Northern Trust as of the date of the consolidated financial statements. The fair values of all loans were adjusted to reflect current assessments of loan collectability.

42

Notes to Consolidated Financial Statements (continued)

Federal Reserve and Federal Home Loan Bank Stock. The fair values of Federal Reserve and Federal Home Loan Bank stock are equal to their carrying values which represent redemption value.

Community Development Investments. The fair values of these instruments were estimated using an income approach (discounted cash flow) that incorporates current market rates.

Employee Benefit and Deferred Compensation. These assets include U.S. Treasury securities and investments in mutual and collective trust funds held to fund certain supplemental employee benefit obligations and deferred compensation plans. Fair values of U.S. Treasury securities were determined using quoted, active market prices for identical securities. The fair values of investments in mutual and collective trust funds were valued at the funds’ net asset values based on a market approach.

Savings Certificates and Other Time Deposits. The fair values of these instruments were estimated using an income approach (discounted cash flow) that incorporates market interest rates currently offered by Northern Trust for deposits with similar maturities.

Senior Notes, Subordinated Debt, and Floating Rate Capital Debt. Fair values were determined using a market approach based on quoted market prices, when available. If quoted market prices were not available, fair values were based on quoted market prices for comparable instruments.

Federal Home Loan Bank Borrowings. The fair values of these instruments were estimated using an income approach (discounted cash flow) that incorporates market interest rates available to Northern Trust.

Loan Commitments. The fair values of loan commitments represent the estimated costs to terminate or otherwise settle the obligations with a third party adjusted for any related allowance for credit losses.

Standby Letters of Credit. The fair values of standby letters of credit are measured as the amount of unamortized fees on these instruments, inclusive of the related allowance for credit losses. Fees are determined by applying basis points to the principal amounts of the letters of credit.

Financial Instruments Valued at Carrying Value. Due to their short maturity, the carrying values of certain financial instruments approximated their fair values. These financial instruments include: cash and due from banks; federal funds sold and securities purchased under agreements to resell; interest-bearing deposits with banks; Federal Reserve deposits; client security settlement receivables; non-U.S. offices interest-bearing deposits; federal funds purchased; securities sold under agreements to repurchase; and other borrowings (includes term federal funds purchased and other short-term borrowings). The fair values of demand, noninterest-bearing, savings, and money market deposits represent the amounts payable on demand as of the reporting date, although such deposits are typically priced at a premium in banking industry consolidations.

43

Notes to Consolidated Financial Statements (continued)

The following tables summarize the fair values of all financial instruments.

Table 33: Fair Value of Financial Instruments

(In Millions)	June 30, 2015
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	7,152.9	$	7,152.9	$	7,152.9	$	—	$	—
Federal Funds Sold and Resell Agreements		1,020.0		1,020.0		—		1,020.0		—
Interest-Bearing Deposits with Banks		15,650.3		15,650.3		—		15,650.3		—
Federal Reserve Deposits		17,488.7		17,488.7		—		17,488.7		—
Securities
Available for Sale (1)		31,835.6		31,835.6		5,018.8		26,800.2		16.6
Held to Maturity		6,990.8		6,986.4		—		6,986.4		—
Trading Account		1.2		1.2		—		1.2		—
Loans (excluding Leases)
Held for Investment		31,863.4		32,022.3		—		—		32,022.3
Held for Sale		3.9		3.9		—		—		3.9
Client Security Settlement Receivables		2,034.2		2,034.2		—		2,034.2		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		178.1		178.1		—		178.1		—
Community Development Investments		187.4		186.2		—		186.2		—
Employee Benefit and Deferred Compensation		161.3		161.1		109.5		51.6		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	46,237.5	$	46,237.5	$	46,237.5	$	—	$	—
Savings Certificates and Other Time		1,540.5		1,554.4		—		1,554.4		—
Non U.S. Offices Interest-Bearing		52,909.9		52,909.9		—		52,909.9		—
Federal Funds Purchased		351.3		351.3		—		351.3		—
Securities Sold under Agreements to Repurchase		29.8		29.8		—		29.8		—
Other Borrowings		3,322.9		3,325.2		—		3,325.2		—
Senior Notes		1,497.2		1,534.1		—		1,534.1		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,330.1		1,338.3		—		1,338.3		—
Floating Rate Capital Debt		277.3		244.6		—		244.6		—
Other Liabilities
Standby Letters of Credit		43.5		43.5		—		—		43.5
Loan Commitments		25.6		25.6		—		—		25.6
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	30.8	$	30.8	$	—	$	30.8	$	—
Liabilities		58.7		58.7		—		58.7		—
Interest Rate Contracts
Assets		107.7		107.7		—		107.7		—
Liabilities		27.4		27.4		—		27.4		—
Other Financial Derivatives (2)
Liabilities		11.3		11.3		—		—		11.3
Client-Related and Trading
Foreign Exchange Contracts
Assets		2,451.3		2,451.3		—		2,451.3		—
Liabilities		2,416.7		2,416.7		—		2,416.7		—
Interest Rate Contracts
Assets		96.5		96.5		—		96.5		—
Liabilities		93.1		93.1		—		93.1		—

(1) Refer to the table located on page 39 for the disaggregation of available for sale securities.

(2) This line includes a swap related to the sale of certain Visa Class B common shares.

44

Notes to Consolidated Financial Statements (continued)

(In Millions)	December 31, 2014
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	3,050.6	$	3,050.6	$	3,050.6	$	—	$	—
Federal Funds Sold and Resell Agreements		1,062.7		1,062.7		—		1,062.7		—
Interest-Bearing Deposits with Banks		14,928.3		14,928.3		—		14,928.3		—
Federal Reserve Deposits		17,386.3		17,386.3		—		17,386.3		—
Securities
Available for Sale (1)		29,558.5		29,558.5		4,506.9		25,033.5		18.1
Held to Maturity		4,170.8		4,176.1		—		4,176.1		—
Trading Account		4.7		4.7		—		4.7		—
Loans (excluding Leases)
Held for Investment		30,458.0		30,600.4		—		—		30,600.4
Held for Sale		2.5		2.5		—		—		2.5
Client Security Settlement Receivables		1,568.8		1,568.8		—		1,568.8		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		207.5		207.5		—		207.5		—
Community Development Investments		209.9		210.8		—		210.8		—
Employee Benefit and Deferred Compensation		143.2		146.7		96.7		50.0		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	41,454.6	$	41,454.6	$	41,454.6	$	—	$	—
Savings Certificates and Other Time		1,757.4		1,757.0		—		1,757.0		—
Non U.S. Offices Interest-Bearing		47,545.0		47,545.0		—		47,545.0		—
Federal Funds Purchased		932.9		932.9		—		932.9		—
Securities Sold under Agreements to Repurchase		885.1		885.1		—		885.1		—
Other Borrowings		1,685.2		1,686.2		—		1,686.2		—
Senior Notes		1,497.0		1,541.8		—		1,541.8		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,583.3		1,583.4		—		1,583.4		—
Floating Rate Capital Debt		277.2		242.8		—		242.8		—
Other Liabilities
Standby Letters of Credit		60.1		60.1		—		—		60.1
Loan Commitments		28.3		28.3		—		—		28.3
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	125.7	$	125.7	$	—	$	125.7	$	—
Liabilities		23.5		23.5		—		23.5		—
Interest Rate Contracts
Assets		126.8		126.8		—		126.8		—
Liabilities		30.5		30.5		—		30.5		—
Client-Related and Trading
Foreign Exchange Contracts
Assets		4,149.5		4,149.5		—		4,149.5		—
Liabilities		4,072.0		4,072.0		—		4,072.0		—
Interest Rate Contracts
Assets		105.5		105.5		—		105.5		—
Liabilities		101.3		101.3		—		101.3		—

(1) Refer to the table located on page 40 for the disaggregation of available for sale securities.

45

Notes to Consolidated Financial Statements (continued)

4. Securities — The following tables provide the amortized cost and fair values of securities at June 30, 2015, and December 31, 2014.

Table 34: Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale

Securities Available for Sale	June 30, 2015
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	4,993.5	$	25.3	$	—	$	5,018.8
Obligations of States and Political Subdivisions		4.5		—		—		4.5
Government Sponsored Agency		16,690.1		91.4		16.1		16,765.4
Non-U.S. Government		310.3		0.7		—		311.0
Corporate Debt		3,749.1		4.8		19.1		3,734.8
Covered Bonds		1,975.5		6.9		0.2		1,982.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		560.0		1.2		0.5		560.7
Other Asset-Backed		3,118.5		1.2		0.5		3,119.2
Auction Rate		16.7		0.5		0.6		16.6
Commercial Mortgage-Backed		198.8		0.1		0.2		198.7
Other		123.5		0.2		—		123.7
Total	$	31,740.5	$	132.3	$	37.2	$	31,835.6

Securities Available for Sale	December 31, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	4,493.5	$	15.1	$	1.7	$	4,506.9
Obligations of States and Political Subdivisions		4.5		0.1		—		4.6
Government Sponsored Agency		16,326.4		82.3		19.5		16,389.2
Non-U.S. Government		309.5		0.9		—		310.4
Corporate Debt		3,617.5		1.8		41.6		3,577.7
Covered Bonds		1,899.9		7.9		0.3		1,907.5
Supranational and Non-U.S. Agency Bonds		360.0		1.5		0.9		360.6
Residential Mortgage-Backed		6.9		—		0.5		6.4
Other Asset-Backed		2,321.8		0.5		1.0		2,321.3
Auction Rate		18.4		0.5		0.8		18.1
Other		155.7		0.3		0.2		155.8
Total	$	29,514.1	$	110.9	$	66.5	$	29,558.5

Table 35: Reconciliation of Amortized Cost to Fair Value of Securities Held to Maturity

Securities Held to Maturity	June 30, 2015
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	103.4	$	5.9	$	—	$	109.3
Government Sponsored Agency		11.5		0.9		—		12.4
Covered Bonds		125.9		0.1		—		126.0
Non-U.S. Government		1,363.9		6.2		0.4		1,369.7
Certificates of Deposit		3,036.8		0.1		0.6		3,036.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		2,266.4		8.0		0.8		2,273.6
Other		82.9		—		23.8		59.1
Total	$	6,990.8	$	21.2	$	25.6	$	6,986.4

46

Notes to Consolidated Financial Statements (continued)

Securities Held to Maturity	December 31, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	121.9	$	7.4	$	—	$	129.3
Government Sponsored Agency		18.4		1.1		—		19.5
Non-U.S. Government		1,281.6		6.6		0.4		1,287.8
Certificates of Deposit		924.3		0.1		0.1		924.3
Supranational and Non-U.S. Agency Bonds		1,745.8		10.9		0.5		1,756.2
Other		78.8		0.3		20.1		59.0
Total	$	4,170.8	$	26.4	$	21.1	$	4,176.1

Securities held to maturity consist of debt securities that management intends to, and Northern Trust has the ability to, hold until maturity.

The following table provides the remaining maturity of securities as of June 30, 2015.

Table 36: Remaining Maturity of Securities Available for Sale and Held to Maturity

	June 30, 2015
(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	7,716.2	$	7,738.2
Due After One Year Through Five Years		19,130.6		19,196.1
Due After Five Years Through Ten Years		3,710.9		3,713.9
Due After Ten Years		1,182.8		1,187.4
Total		31,740.5		31,835.6
Held to Maturity
Due in One Year or Less		3,950.0		3,951.8
Due After One Year Through Five Years		2,976.6		2,990.7
Due After Five Years Through Ten Years		20.6		18.4
Due After Ten Years		43.6		25.5
Total	$	6,990.8	$	6,986.4

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

Investment Security Gains and Losses. Net investment security losses of $0.4 million and net investment security gains of $0.4 million were recognized in the three months ended June 30, 2015 and 2014. Gross proceeds from the sale of securities during the three months ended June 30, 2015 of $4.5 million resulted in gross realized losses of $0.4 million. Gross proceeds from the sale of securities during the three months ended June 30, 2014 of $264.2 million resulted in gross realized gains of $0.4 million.

Net investment security losses of $0.3 million were recognized in the six months ended June 30, 2015, representing net realized losses from the sale of securities. Net investment security losses of $3.6 million were recognized in the six months ended June 30, 2014, and included $3.9 million of charges related to the other-than-temporary impairment (OTTI) of certain Community Reinvestment Act (CRA) eligible held to maturity securities. For the six months ended June 30, 2015, proceeds of $106.5 million were received from the sale of

47

Notes to Consolidated Financial Statements (continued)

securities, resulting in gross realized gains and losses of $0.1 million and $0.4 million, respectively. For the six months ended June 30, 2014, proceeds of $463.9 million were received from the sale of securities, resulting in gross realized gains and losses of $0.7 million and $0.4 million, respectively.

Securities with Unrealized Losses. The following tables provide information regarding securities that had been in a continuous unrealized loss position for less than 12 months and for 12 months or longer as of June 30, 2015, and December 31, 2014.

Table 37: Securities with Unrealized Losses

Securities with Unrealized Losses as of June 30, 2015	Less than 12 Months				12 Months or Longer				Total
(In Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Government Sponsored Agency		3,285.0		8.2		914.3		7.9		4,199.3		16.1
Non-U.S. Government		212.7		0.4		—		—		212.7		0.4
Corporate Debt		943.8		3.8		1,087.0		15.3		2,030.8		19.1
Covered Bonds		154.3		0.2		—		—		154.3		0.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		709.5		1.0		177.4		0.3		886.9		1.3
Other Asset-Backed		1,233.7		0.5		—		—		1,233.7		0.5
Certificates of Deposit		1,878.5		0.6		—		—		1,878.5		0.6
Auction Rate		1.5		0.1		4.6		0.5		6.1		0.6
Commercial Mortgage-Backed		52.5		0.2		—		—		52.5		0.2
Other		16.2		10.8		48.2		13.0		64.4		23.8
Total	$	8,487.7	$	25.8	$	2,231.5	$	37.0	$	10,719.2	$	62.8

Securities with Unrealized Losses as of December 31, 2014	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	$	998.2	$	1.7	$	—	$	—	$	998.2	$	1.7
Government Sponsored Agency		2,344.9		6.6		1,730.0		12.9		4,074.9		19.5
Non-U.S. Government		292.9		0.4		—		—		292.9		0.4
Corporate Debt		1,244.5		3.9		1,338.8		37.7		2,583.3		41.6
Covered Bonds		142.3		0.2		10.0		0.1		152.3		0.3
Supranational and Non-U.S. Agency Bonds		313.2		0.3		175.5		1.1		488.7		1.4
Residential Mortgage-Backed		—		—		4.5		0.5		4.5		0.5
Other Asset-Backed		1,297.6		1.0		—		—		1,297.6		1.0
Certificates of Deposit		438.6		0.1		—		—		438.6		0.1
Auction Rate		2.4		0.2		4.7		0.6		7.1		0.8
Other		27.1		12.1		45.6		8.2		72.7		20.3
Total	$	7,101.7	$	26.5	$	3,309.1	$	61.1	$	10,410.8	$	87.6

As of June 30, 2015, 524 securities with a combined fair value of $10.7 billion were in an unrealized loss position, with their unrealized losses totaling $62.8 million. Unrealized losses of $19.1 million within corporate debt securities primarily reflected higher market rates since purchase; 37% of the corporate debt portfolio is backed by guarantees provided by U.S. and non-U.S. governmental entities. Unrealized losses of $16.1 million related to government sponsored agency securities were primarily attributable to higher market interest rates since purchase.

48

Notes to Consolidated Financial Statements (continued)

Securities classified as “other asset-backed” had average lives less than 5 years, and 99.6% were rated triple-A.

The majority of the $23.8 million of unrealized losses in securities classified as “other” at June 30, 2015, related to securities primarily purchased at a premium or par by Northern Trust for compliance with the CRA. Unrealized losses on these CRA-related securities were attributable to yields that are below market rates for the purpose of supporting institutions and programs that benefit low- to moderate- income communities within Northern Trust’s market area. Unrealized losses of $0.6 million related to auction rate securities primarily reflected reduced market liquidity as a majority of auctions continued to fail, preventing holders from liquidating their investments at par. The remaining unrealized losses on Northern Trust’s securities portfolio as of June 30, 2015, were attributable to changes in overall market interest rates, increased credit spreads or reduced market liquidity. As of June 30, 2015, Northern Trust did not intend to sell any investment in an unrealized loss position and it was not more likely than not that Northern Trust would be required to sell any such investment before the recovery of its amortized cost basis, which may be maturity.

Security impairment reviews are conducted quarterly to identify and evaluate securities that have indications of possible OTTI. A determination as to whether a security’s decline in market value is other-than-temporary 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 other-than-temporary include, but are not limited to: the length of time the security has been impaired; 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 it 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 OTTI has occurred.

While all securities are considered, the process for identifying credit impairment within CRA-eligible mortgage-backed securities, the security type for which Northern Trust recognized all of its OTTI in 2014, incorporates an expected loss approach using discounted cash flows on the underlying collateral pools. To evaluate whether an unrealized loss on CRA-eligible mortgage-backed securities is other-than-temporary, a calculation of the security’s present value is made using current pool data, the current delinquency pipeline, default rates and loan loss severities based on the historical performance of like collateral, and Northern Trust’s outlook for the housing market and the overall economy. If the present value of the collateral pools was found to be less than the current amortized cost of the security, a credit-related OTTI loss would be recorded in earnings equal to the difference between the two amounts.

Impairments of CRA-eligible mortgage-backed securities are influenced by a number of factors, including but not limited to, U.S. economic and housing market performance, pool credit enhancement level, year of origination and estimated credit quality of the collateral. The factors used in estimating losses related to CRA-eligible mortgage-backed securities vary by vintage of loan origination and collateral quality.

There were no OTTI losses recognized in the three or six months ended June 30, 2015 or in the three months ended June 30, 2014. There were $3.9 million of OTTI losses recognized during the six months ended June 30, 2014 related to CRA-eligible mortgage-backed securities.

Credit Losses on Debt Securities. The table below provides information regarding total other-than-temporarily impaired securities, including noncredit-related amounts recognized in other comprehensive income and net impairment losses recognized in earnings, for the three and six months ended June 30, 2015 and 2014.

49

Notes to Consolidated Financial Statements (continued)

Table 38: Net Impairment Losses Recognized in Earnings

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Changes in OTTI Losses*	$	—	$	—	$	—	$	(4.6	)
Noncredit-related Losses Recorded in / (Reclassified from) OCI**		—		—		—		0.7
Net Impairment Losses Recognized in Earnings	$	—	$	—	$	—	$	(3.9	)

* For initial OTTI in the applicable period, the balance includes the excess of the amortized cost over the fair value of the impaired securities. For subsequent impairments of the same security, the balance includes any additional changes in fair value of the security subsequent to its most recently recorded OTTI.

** For initial OTTI in the applicable period, the balance includes the portion of the excess of amortized cost over the fair value of the impaired securities that was recorded in other comprehensive income (OCI). For subsequent impairments of the same security, the balance includes additional changes in OCI for that security subsequent to its most recently recorded OTTI.

Provided in the table below are the cumulative credit-related losses recognized in earnings on debt securities other-than-temporarily impaired.

Table 39: Cumulative Credit-Related Losses on Securities

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Cumulative Credit-Related Losses on Securities Held — Beginning of Period	$	5.2	$	12.7	$	5.2	$	8.8
Plus: Losses on Newly Identified Impairments		—		—		—		1.8
Additional Losses on Previously Identified Impairments		—		—		—		2.1
Less: Current and Prior Period Losses on Securities Sold During the Period		—		—		—		—
Cumulative Credit-Related Losses on Securities Held — End of Period	$	5.2	$	12.7	$	5.2	$	12.7

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.

50

Notes to Consolidated Financial Statements (continued)

The following table provides information regarding repurchase agreements that are accounted for as secured borrowings as of June 30, 2015.

Table 40: Repurchase Agreements Accounted for as Secured Borrowings

	June 30, 2015
(In Millions)	Remaining Contractual Maturity of the Agreements
Repurchase Agreements	Overnight and Continuous
U.S. Treasury and Agency Securities	$	29.8
Total Borrowings	$	29.8
Gross Amount of Recognized Liabilities for Repurchase Agreements in footnote 21	$	29.8
Amounts related to agreements not included in footnote 21	$	—

6. Loans and Leases — Amounts outstanding for loans and leases, by segment and class, are shown below.

Table 41: Loans and Leases

(In Millions)	June 30, 2015			December 31, 2014
Commercial
Commercial and Institutional	$	8,999.1		$	8,381.9
Commercial Real Estate		3,651.4			3,333.3
Lease Financing, net		832.9			916.3
Non-U.S.		1,533.1			1,530.6
Other		288.4			191.5
Total Commercial		15,304.9			14,353.6
Personal
Residential Real Estate		9,369.0			9,782.6
Private Client		8,224.0			7,466.9
Other		55.9			37.1
Total Personal		17,648.9			17,286.6
Total Loans and Leases		32,953.8			31,640.2
Allowance for Credit Losses Assigned to Loans and Leases		(257.3	)		(267.0	)
Net Loans and Leases	$	32,696.5		$	31,373.2

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 June 30, 2015, and December 31, 2014, equity credit lines totaled $1.7 billion and $1.8 billion, respectively, and equity credit lines for which first liens were held by Northern Trust represented 89% of the total equity credit lines as of both of those dates.

51

Notes to Consolidated Financial Statements (continued)

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, that totaled $1.4 billion at June 30, 2015, and $1.5 billion at December 31, 2014. Demand deposits reclassified as loan balances totaled $46.7 million and $92.1 million at June 30, 2015, and December 31, 2014, respectively. Loans classified as held for sale totaled $3.9 million at June 30, 2015. Loans classified as held for sale totaled $2.5 million at December 31, 2014.

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, management reporting and the calculation of credit loss allowances and economic capital.

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 or other subjective assessment methodologies, 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 validated at least annually.

52

Notes to Consolidated Financial Statements (continued)

Loan and lease segment and class balances as of June 30, 2015, and December 31, 2014, are provided below, segregated by borrower ratings into “1 to 3,” “4 to 5” and “6 to 9” (watch list), categories.

Table 42: Borrower Ratings

	June 30, 2015								December 31, 2014
(In Millions)	1 to 3 Category		4 to 5 Category		6 to 9 Category (Watch List)		Total		1 to 3 Category		4 to 5 Category		6 to 9 Category (Watch List)		Total
Commercial
Commercial and Institutional	$	5,820.5	$	3,071.1	$	107.5	$	8,999.1	$	5,340.9	$	2,947.3	$	93.7	$	8,381.9
Commercial Real Estate		1,596.8		1,988.7		65.9		3,651.4		1,371.7		1,861.8		99.8		3,333.3
Lease Financing, net		477.6		352.4		2.9		832.9		552.5		360.3		3.5		916.3
Non-U.S.		770.2		762.7		0.2		1,533.1		636.8		892.9		0.9		1,530.6
Other		186.4		102.0		—		288.4		108.1		83.4		—		191.5
Total Commercial		8,851.5		6,276.9		176.5		15,304.9		8,010.0		6,145.7		197.9		14,353.6
Personal
Residential Real Estate		2,794.7		6,195.2		379.1		9,369.0		3,148.0		6,207.0		427.6		9,782.6
Private Client		5,216.7		2,992.5		14.8		8,224.0		5,143.8		2,311.7		11.4		7,466.9
Other		36.1		19.8		—		55.9		21.1		16.0		—		37.1
Total Personal		8,047.5		9,207.5		393.9		17,648.9		8,312.9		8,534.7		439.0		17,286.6
Total Loans and Leases	$	16,899.0	$	15,484.4	$	570.4	$	32,953.8	$	16,322.9	$	14,680.4	$	636.9	$	31,640.2

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 reduced cushion in adverse down cycle scenarios. 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 nonperforming 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.

Recognition of Income. Interest income on loans 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 nonperforming and interest income is recorded on a cash basis. At the time a loan is determined to be nonperforming, interest accrued but not collected is reversed against interest income in the current period. Interest collected on nonperforming 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

53

Notes to Consolidated Financial Statements (continued)

suspension and subsequent resumption of income recognition, do not meaningfully vary between loan and lease classes. Nonperforming loans are returned to performing status when factors indicating doubtful collectability no longer exist. Factors considered in returning a loan to performing 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 performing 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 performing status provided there has been a sustained period of repayment performance (generally a minimum of six months) 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 months) under the revised terms.

Past due status is based on how long since the contractual due date a principal or interest payment has been past due. For disclosure purposes, loans that are 29 days past due or less are reported as current. The following tables provide balances and delinquency status of performing and nonperforming loans and leases by segment and class, as well as the total OREO and nonperforming asset balances, as of June 30, 2015, and December 31, 2014.

Table 43: Delinquency Status

June 30, 2015
(In Millions)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	8,880.3	$	5.5	$	87.5	$	2.4	$	8,975.7	$	23.4	$	8,999.1
Commercial Real Estate		3,590.5		19.4		11.3		4.2		3,625.4		26.0		3,651.4
Lease Financing, net		832.9		—		—		—		832.9		—		832.9
Non-U.S.		1,533.1		—		—		—		1,533.1		—		1,533.1
Other		288.4		—		—		—		288.4		—		288.4
Total Commercial		15,125.2		24.9		98.8		6.6		15,255.5		49.4		15,304.9
Personal
Residential Real Estate		9,196.0		6.5		6.4		1.9		9,210.8		158.2		9,369.0
Private Client		8,180.3		31.5		4.7		6.4		8,222.9		1.1		8,224.0
Other		55.9		—		—		—		55.9		—		55.9
Total Personal		17,432.2		38.0		11.1		8.3		17,489.6		159.3		17,648.9
Total Loans and Leases	$	32,557.4	$	62.9	$	109.9	$	14.9	$	32,745.1	$	208.7	$	32,953.8
								Other Real Estate Owned				10.1
								Total Nonperforming Assets			$	218.8

54

Notes to Consolidated Financial Statements (continued)

December 31, 2014
(In Millions)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	8,340.5	$	14.5	$	4.0	$	7.9	$	8,366.9	$	15.0	$	8,381.9
Commercial Real Estate		3,274.3		9.6		9.8		2.5		3,296.2		37.1		3,333.3
Lease Financing, net		916.3		—		—		—		916.3		—		916.3
Non-U.S.		1,530.6		—		—		—		1,530.6		—		1,530.6
Other		191.5		—		—		—		191.5		—		191.5
Total Commercial		14,253.2		24.1		13.8		10.4		14,301.5		52.1		14,353.6
Personal
Residential Real Estate		9,556.3		49.5		9.9		4.5		9,620.2		162.4		9,782.6
Private Client		7,396.0		56.0		5.9		7.8		7,465.7		1.2		7,466.9
Other		37.1		—		—		—		37.1		—		37.1
Total Personal		16,989.4		105.5		15.8		12.3		17,123.0		163.6		17,286.6
Total Loans and Leases	$	31,242.6	$	129.6	$	29.6	$	22.7	$	31,424.5	$	215.7	$	31,640.2
								Other Real Estate Owned				16.6
								Total Nonperforming Assets			$	232.3

Impaired Loans. A loan is considered to be impaired when, based on current information and events, management determines that it is probable that Northern Trust will be unable to collect all amounts due according to the contractual terms of the loan agreement. Impaired loans are identified through ongoing credit management and risk rating processes, including the formal review of past due and watch list credits. Payment performance and delinquency status are critical factors in identifying impairment for all loans and leases, particularly those within the residential real estate, private client and personal-other classes. Other key factors considered in identifying impairment of loans and leases within the commercial and institutional, non-U.S., lease financing and commercial-other classes relate to the borrower’s ability to perform under the terms of the obligation as measured through the assessment of future cash flows, including consideration of collateral value, market value and other factors. A loan is also considered to be impaired if its terms have been modified as a concession resulting from the debtor’s financial difficulties, referred to as a troubled debt restructuring (TDR) and discussed in further detail below. Impairment is measured based upon the loan’s market price, the present value of expected future cash flows, discounted at the loan’s effective interest rate, or the fair value of the collateral if the loan is collateral dependent. If the loan valuation is less than the recorded value of the loan, based on the certainty of loss, either a specific allowance is established or a charge-off is recorded for the difference. Smaller balance (individually less than $250,000) homogeneous loans are collectively evaluated for impairment and excluded from impaired loan disclosures as allowed under applicable accounting standards. Northern Trust’s accounting policies for impaired loans is consistent across all classes of loans and leases.

55

Notes to Consolidated Financial Statements (continued)

The following tables provide information related to impaired loans by segment and class.

Table 44: Information about Impaired Loans as of the Period End

	As of June 30, 2015						As of December 31, 2014
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Allowance		Recorded Investment		Unpaid Principal Balance		Specific Allowance
With No Related Specific Allowance
Commercial and Institutional	$	8.8	$	11.9	$	—	$	9.0	$	12.0	$	—
Commercial Real Estate		23.9		29.1		—		47.0		52.4		—
Lease Financing, net		—		—		—		4.2		4.2		—
Residential Real Estate		155.7		200.5		—		160.9		204.8		—
Private Client		0.8		0.8		—		0.2		0.5		—
With a Related Specific Allowance
Commercial and Institutional		11.5		7.1		4.9		6.5		6.6		2.9
Commercial Real Estate		5.6		6.6		1.5		12.2		18.3		2.9
Lease Financing, net		2.9		2.9		1.4		—		—		—
Residential Real Estate		9.0		9.2		2.6		1.4		1.4		0.4
Private Client		0.8		0.8		0.4		0.8		0.8		0.4
Total
Commercial		52.7		57.6		7.8		78.9		93.5		5.8
Personal		166.3		211.3		3.0		163.3		207.5		0.8
Total	$	219.0	$	268.9	$	10.8	$	242.2	$	301.0	$	6.6

	Three Months Ended June 30,								Six Months Ended June 30,
	2015				2014				2015				2014
(In Millions)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With No Related Specific Allowance
Commercial and Institutional	$	8.1	$	—	$	10.6	$	—	$	8.6	$	—	$	11.0	$	—
Commercial Real Estate		33.9		0.2		44.7		0.2		41.2		0.4		44.8		0.5
Lease Financing, net		—		—		4.3		—		3.4		0.1		4.4		0.1
Residential Real Estate		155.7		0.5		181.2		0.7		158.5		0.8		185.2		1.3
Private Client		0.6		—		0.7		—		0.4		—		0.7		—
With a Related Specific Allowance
Commercial and Institutional		12.2		—		9.7		—		10.3		—		9.9		—
Commercial Real Estate		10.2		—		22.7		—		11.2		—		24.6		—
Lease Financing, net		3.2		—		—		—		1.6		—		—		—
Residential Real Estate		6.8		—		3.8		—		4.8		—		5.4		—
Private Client		0.8		—		0.5		—		0.8		—		0.3		—
Total
Commercial		67.6		0.2		92.0		0.2		76.3		0.5		94.7		0.6
Personal		163.9		0.5		186.2		0.7		164.5		0.8		191.6		1.3
Total	$	231.5	$	0.7	$	278.2	$	0.9	$	240.8	$	1.3	$	286.3	$	1.9

Note: Average recorded investment in impaired loans is calculated as the average of the month-end impaired loan balances for the period.

56

Notes to Consolidated Financial Statements (continued)

Interest income that would have been recorded for nonperforming loans in accordance with their original terms was $2.0 million and $2.4 million, respectively, for the three months ended June 30, 2015 and 2014, and $4.1 million and $4.9 million, respectively, for the six months ended June 30, 2015 and 2014.

There were $2.6 million and $2.4 million of aggregate undrawn loan commitments and standby letters of credit at June 30, 2015, and December 31, 2014, respectively, issued to borrowers whose loans were classified as nonperforming or impaired.

Troubled Debt Restructurings (TDRs). Included within impaired loans were $82.2 million and $82.7 million of nonperforming TDRs, and $46.9 million and $68.6 million of performing TDRs as of June 30, 2015, and December 31, 2014, respectively. All TDRs are reported as impaired loans in the calendar year of their restructuring. In subsequent years, a TDR may cease being reported as impaired if the loan was modified at a market rate and has performed according to the modified terms for at least six months. A loan that has been modified at a below market rate will return to performing status if it satisfies the six-month performance requirement; however, it will remain reported as impaired.

The following tables provide, by segment and class, the number of loans and leases modified in TDRs during the three- and six-month periods ended June 30, 2015 and 2014, and the recorded investments and unpaid principal balances as of June 30, 2015 and 2014.

Table 45: Troubled Debt Restructurings

($ In Millions)	Three Months Ended June 30, 2015						Six Months Ended June 30, 2015
	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	$	0.1	$	0.1		2	$	0.1	$	0.1
Commercial Real Estate		—		—		—		1		0.8		0.8
Total Commercial		1		0.1		0.1		3		0.9		0.9
Personal
Residential Real Estate		19		8.5		9.4		76		15.6		19.6
Private Client		1		0.6		0.6		1		0.6		0.6
Total Personal		20		9.1		10.0		77		16.2		20.2
Total Loans and Leases		21	$	9.2	$	10.1		80	$	17.1	$	21.1

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

57

Notes to Consolidated Financial Statements (continued)

($ In Millions)	Three Months Ended June 30, 2014						Six Months Ended June 30, 2014
	Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance		Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance
Commercial
Commercial and Institutional		2	$	0.7	$	1.0		2	$	0.7	$	1.0
Commercial Real Estate		—		—		—		1		0.7		0.7
Total Commercial		2		0.7		1.0		3		1.4		1.7
Personal
Residential Real Estate		34		4.9		5.7		68		8.4		9.4
Private Client		2		0.3		0.3		3		0.3		0.3
Total Personal		36		5.2		6.0		71		8.7		9.7
Total Loans and Leases		38	$	5.9	$	7.0		74	$	10.1	$	11.4

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

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

During the three and six months ended June 30, 2015, the TDR modifications of the loans within commercial and institutional and private client were extensions of term. The majority of the TDR modifications within residential real estate were interest rate concessions, extensions of term or deferred principal. During the three and six months ended June 30, 2014, TDR modifications of loans within the commercial real estate, residential real estate, and private client classes were extensions of term.

There were four residential real estate loans modified as TDRs in the 12 months ended March 31, 2015, which subsequently became nonperforming during the three and six months ended June 30, 2015. The total recorded investment and unpaid principal balance for these loans was approximately $0.6 million and $0.7 million, respectively.

There were three residential real estate loans modified as TDRs in the 12 months ended March 31, 2014 which subsequently became nonperforming during the three and six months ended June 30, 2014. The total recorded investment and unpaid principal balance for these loans were $0.5 million and $0.9 million, respectively. There was one private client loan modified as a TDR in the 12 months ended March 31, 2014 which subsequently became nonperforming during the three and six months ended June 30, 2014. The total recorded investment and unpaid principal balance for this loan was de minimis.

All loans and leases modified in troubled debt restructurings are evaluated for impairment. The nature and extent of impairment of TDRs, including those that have experienced a subsequent default, is considered in the determination of an appropriate level of allowance for credit losses.

Northern Trust may obtain physical possession of residential real estate collateralizing a consumer mortgage loan via foreclosure on an in-substance repossession. As of June 30, 2015, Northern Trust held foreclosed residential real estate properties with a carrying value of $8.4 million as a result of obtaining physical possession. In addition, as of June 30, 2015, Northern Trust had consumer loans with a carrying value of $24.4 million collateralized by residential real estate property for which formal foreclosure proceedings were in process.

Leveraged Leases. During the three months ended June 30, 2015, Northern Trust determined that there was an other-than-temporary impairment of the residual value related to certain aircraft under leveraged lease

58

Notes to Consolidated Financial Statements (continued)

agreements. The impact of the impairment was $17.8 million, which was recognized as a reduction to interest income in the consolidated statements of income during the three months ended June 30, 2015. See “Leveraged Leases” under Note 18 — Variable Interest Entities for further information.

7. Allowance for Credit Losses — The allowance for credit losses, which represents management’s estimate of probable losses related to specific borrower relationships and inherent in the various loan and lease portfolios, undrawn commitments, and standby letters of credit, is determined by management through a disciplined credit review process. Northern Trust’s accounting policies related to the estimation of the allowance for credit losses and the charging off of loans, leases and other extensions of credit deemed uncollectible are consistent across both loan and lease segments.

In establishing the inherent portion of the allowance for credit losses, Northern Trust’s Loan Loss Reserve Committee assesses a common set of qualitative factors applicable to both the commercial and personal loan segments. The risk characteristics underlying these qualitative factors, and management’s assessments as to the relative importance of a qualitative factor, can vary between loan segments and between classes within loan segments. Factors evaluated include those related to external matters, such as economic conditions and changes in collateral value, and those related to internal matters, such as changes in asset quality metrics and loan review activities. In addition to the factors noted above, risk characteristics such as portfolio delinquencies, percentage of portfolio on the watch list and on nonperforming status, and average borrower ratings are assessed in the determination of the inherent allowance.

Loan-to-value levels are considered for collateral-secured loans and leases in both the personal and commercial segments. Borrower debt service coverage is evaluated in the personal segment, and cash flow coverage is analyzed in the commercial segment.

Similar risk characteristics by type of exposure are analyzed when determining the allowance for undrawn commitments and standby letters of credit. These qualitative factors, together with historical loss rates, serve as the basis for the allowance for credit losses.

Loans, leases and other extensions of credit deemed uncollectible are charged to the allowance for credit losses. Subsequent recoveries, if any, are credited to the allowance. Determinations as to whether an uncollectible loan is charged-off or a specific allowance is established are based on management’s assessment as to the level of certainty regarding the amount of loss.

59

Notes to Consolidated Financial Statements (continued)

The following tables provide information regarding changes in the total allowance for credit losses by segment during the three and six months ended June 30, 2015 and 2014.

Table 46: Changes in the Allowance for Credit Losses

	Three Months Ended June 30,
	2015									2014
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	164.3		$	122.4		$	286.7		$	173.1		$	136.3		$	309.4
Charge-Offs		(2.5	)		(3.6	)		(6.1	)		(2.1	)		(5.7	)		(7.8	)
Recoveries		2.4			1.1			3.5			0.3			1.6			1.9
Net (Charge-Offs) Recoveries		(0.1	)		(2.5	)		(2.6	)		(1.8	)		(4.1	)		(5.9	)
Provision for Credit Losses		(11.6	)		1.6			(10.0	)		(2.6	)		2.6			—
Effect of Foreign Exchange Rates		0.1			—			0.1			—			—			—
Balance at End of Period	$	152.7		$	121.5		$	274.2		$	168.7		$	134.8		$	303.5

	Six Months Ended June 30,
	2015									2014
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	169.7		$	126.2		$	295.9		$	168.0		$	139.9		$	307.9
Charge-Offs		(5.2	)		(8.4	)		(13.6	)		(6.3	)		(13.0	)		(19.3	)
Recoveries		4.1			2.3			6.4			8.8			3.1			11.9
Net (Charge-Offs) Recoveries		(1.1	)		(6.1	)		(7.2	)		2.5			(9.9	)		(7.4	)
Provision for Credit Losses		(15.9	)		1.4			(14.5	)		(1.8	)		4.8			3.0
Effect of Foreign Exchange Rates		—			—			—			—			—			—
Balance at End of Period	$	152.7		$	121.5		$	274.2		$	168.7		$	134.8		$	303.5

The following table provides information regarding the balances of the recorded investments in loans and leases and the allowance for credit losses by segment as of June 30, 2015, and December 31, 2014.

Table 47: Information about the Recorded Investments in Loans and Leases

	June 30, 2015						December 31, 2014
(In Millions)	Commercial		Personal		Total		Commercial		Personal		Total
Loans and Leases
Specifically Evaluated for Impairment	$	52.7	$	166.3	$	219.0	$	78.9	$	163.3	$	242.2
Evaluated for Inherent Impairment		15,252.2		17,482.6		32,734.8		14,274.7		17,123.3		31,398.0
Total Loans and Leases		15,304.9		17,648.9		32,953.8		14,353.6		17,286.6		31,640.2
Allowance for Loans and Leases
Specifically Evaluated for Impairment		7.8		3.0		10.8		5.8		0.8		6.6
Evaluated for Inherent Impairment		131.2		115.3		246.5		138.0		122.4		260.4
Allowance Assigned to Loans and Leases		139.0		118.3		257.3		143.8		123.2		267.0
Allowance for Unfunded Exposures
Commitments and Standby Letters of Credit		13.7		3.2		16.9		25.9		3.0		28.9
Total Allowance for Credit Losses	$	152.7	$	121.5	$	274.2	$	169.7	$	126.2	$	295.9

60

Notes to Consolidated Financial Statements (continued)

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 Federal Home Loan Bank borrowings, as well as for other purposes, including support for securities settlement, primarily related to client activities, and for potential Federal Reserve Bank discount window borrowings. As of June 30, 2015, securities and loans totaling $32.9 billion ($23.7 billion of government-sponsored agency and other securities, $103.9 million of obligations of states and political subdivisions and $9.1 billion of loans) were pledged. This compares to $32.3 billion ($23.1 billion of government-sponsored agency and other securities, $122.9 million of obligations of states and political subdivisions and $9.1 billion of loans) at December 31, 2014. Collateral required for these purposes totaled $5.1 billion and $5.9 billion at June 30, 2015, and December 31, 2014, respectively. Included in the total pledged assets at June 30, 2015, and December 31, 2014, were available for sale securities with a total fair value of $17.9 million and $884.8 million, respectively, which were pledged as collateral for agreements to repurchase securities sold transactions. The secured parties to these transactions have the right to repledge or sell these securities.

Northern Trust is not permitted, by contract or custom, to repledge or sell collateral from agreements to resell securities purchased transactions. The total fair value of accepted collateral was $1.0 billion as of each of June 30, 2015 and December 31, 2014. There was no repledged or sold collateral at June 30, 2015 or December 31, 2014.

Deposits maintained to meet Federal Reserve Bank reserve requirements averaged $1.7 billion and $1.6 billion for the three and six months ended June 30, 2015, respectively, and $1.3 billion and $1.2 billion for the three and six months ended June 30, 2014, respectively.

9. Goodwill and Other Intangibles — The carrying amounts of goodwill, reflecting the effect of foreign exchange rates on non-U.S.-dollar-denominated balances, by reporting segment at June 30, 2015, and December 31, 2014, were as follows:

Table 48: Goodwill by Reporting Segment

(In Millions)	June 30, 2015		December 31, 2014
Corporate & Institutional Services	$	462.9	$	461.8
Wealth Management		71.4		71.4
Total Goodwill	$	534.3	$	533.2

The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of June 30, 2015, and December 31, 2014, were as follows:

Table 49: Other Intangible Assets

(In Millions)	June 30, 2015		December 31, 2014
Gross Carrying Amount	$	186.9	$	189.5
Less: Accumulated Amortization		135.7		129.5
Net Book Value	$	51.2	$	60.0

Other intangible assets consist primarily of the value of acquired client relationships and are included within other assets in the consolidated balance sheets. Amortization expense related to other intangible assets totaled $2.1 million and $6.7 million for the three and six months ended June 30, 2015, respectively, and $5.0 million and $9.9 million for the three and six months ended June 30, 2014, respectively. Amortization for the remainder of 2015 and for the years 2016, 2017, 2018, and 2019 is estimated to be $4.2 million, $8.5 million, $8.4 million, $7.8 million and $7.6 million, respectively.

61

Notes to Consolidated Financial Statements (continued)

10. Reporting Segments — The following tables show the earnings contributions of Northern Trust’s reporting segments for the three- and six-month periods ended June 30, 2015 and 2014.

Table 50: Results of Reporting Segments

Three Months Ended June 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2015			2014			2015			2014			2015			2014			2015			2014
Noninterest Income
Trust, Investment and Other Servicing Fees	$	432.0		$	395.4		$	324.8		$	311.5		$	—		$	—		$	756.8		$	706.9
Foreign Exchange Trading Income		71.8			50.7			3.0			2.2			—			—			74.8			52.9
Other Noninterest Income		43.2			47.1			26.8			23.1			103.1			5.1			173.1			75.3
Net Interest Income (FTE)*		92.7			76.7			141.0			132.6			23.9			44.1			257.6			253.4
Revenue*		639.7			569.9			495.6			469.4			127.0			49.2			1,262.3			1,088.5
Provision for Credit Losses		2.0			2.4			(12.0	)		(2.4	)		—			—			(10.0	)		—
Noninterest Expense		488.2			446.4			322.7			329.4			43.6			35.2			854.5			811.0
Income before
Income Taxes*		149.5			121.1			184.9			142.4			83.4			14.0			417.8			277.5
Provision for
Income Taxes*		45.3			36.1			69.6			53.6			33.7			5.9			148.6			95.6
Net Income	$	104.2		$	85.0		$	115.3		$	88.8		$	49.7		$	8.1		$	269.2		$	181.9
Percentage of
Consolidated Net Income		39	%		47	%		43	%		49	%		18	%		4	%		100	%		100	%
Average Assets	$	43,299.8		$	59,995.2		$	24,826.5		$	22,210.8		$	43,564.8		$	21,118.1		$	111,691.1		$	103,324.1

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $6.4 million for 2015 and $6.8 million for 2014.

Six Months Ended June 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2015			2014			2015			2014			2015			2014			2015			2014
Noninterest Income
Trust, Investment and Other Servicing Fees	$	839.3		$	774.6		$	645.0		$	611.8		$	—		$	—		$	1,484.3		$	1,386.4
Foreign Exchange Trading Income		139.3			98.8			7.1			4.2			—			—			146.4			103.0
Other Noninterest Income		85.1			91.5			55.6			45.8			107.2			3.2			247.9			140.5
Net Interest Income (FTE)*		188.7			150.4			279.3			267.6			56.4			89.8			524.4			507.8
Revenue*		1,252.4			1,115.3			987.0			929.4			163.6			93.0			2,403.0			2,137.7
Provision for Credit Losses		(0.2	)		3.6			(14.3	)		(0.6	)		—			—			(14.5	)		3.0
Noninterest Expense		923.1			869.9			644.6			648.2			75.8			60.9			1,643.5			1,579.0
Income before
Income Taxes*		329.5			241.8			356.7			281.8			87.8			32.1			774.0			555.7
Provision for
Income Taxes*		102.6			70.9			134.2			106.2			37.3			15.3			274.1			192.4
Net Income	$	226.9		$	170.9		$	222.5		$	175.6		$	50.5		$	16.8		$	499.9		$	363.3
Percentage of
Consolidated Net Income		45	%		47	%		45	%		48	%		10	%		5	%		100	%		100	%
Average Assets	$	41,540.9		$	58,631.4		$	24,569.1		$	22,368.8			43,503.7			20,792.1		$	109,613.7		$	101,792.3

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $12.6 million for 2015 and $15.5 million for 2014.

In the six-month period ended June 30, 2015, the presentation of certain assets was changed from C&IS to Treasury and Other to reflect better the internal management responsibility for these assets. In addition to the transfer of assets, the Corporation’s internal funds pricing treatment of deposits that fund the transferred assets was updated to reflect the economics of these deposits.

62

Notes to Consolidated Financial Statements (continued)

Further discussion of reporting segment results is provided within the “Reporting Segments” section of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

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 June 30, 2015, and December 31, 2014, preferred stock totaled $388.5 million, related to the issuance of Series C Non-Cumulative Perpetual Preferred Stock (Series C Preferred Stock) in August 2014. As of June 30, 2015, and December 31, 2014, 16 million depositary shares, each representing 1/1000 ownership interest in a share of Series C Preferred Stock, were issued and outstanding. Series C Preferred Stock has no par value and has a liquidation preference of $25,000 ($25 per depositary share).

Dividends on the Series C Preferred Stock 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, at a rate per annum equal to 5.85%. On April 21, 2015, the Corporation declared a cash dividend of $365.625 per share of Series C Preferred Stock payable on July 1, 2015, to stockholders of record as of June 15, 2015.

Common Stock. During the three and six months ended June 30, 2015, the Corporation repurchased 1,295,263 shares at a cost of $96.7 million ($74.64 average price per share) and 2,851,133 shares at a cost of $203.9 million ($71.52 average price per share), respectively. The Corporation’s current common stock repurchase authorization was approved by the Board of Directors in April 2015, pursuant to which the Corporation may repurchase up to 15 million shares. The stock repurchase authorization remaining as of June 30, 2015 was 13,704,737 shares. The repurchase authorization approved by the Board of Directors has no expiration date.

Under the Corporation’s capital plan submitted in January 2015, which was reviewed without objection by the Federal Reserve, the Corporation may repurchase up to $578.3 million of common stock after June 30, 2015, through June 2016.

12. Accumulated Other Comprehensive Income (Loss) — The following tables summarize the components of accumulated other comprehensive income (loss) (AOCI) at June 30, 2015 and 2014, and changes during the three- and six-month periods then ended.

Table 51: Summary of Changes in Accumulated Other Comprehensive Income (Loss)

(In Millions)	Balance at June 30, 2015			Net Change			Balance at December 31, 2014
Net Unrealized Gains (Losses) on Securities Available for Sale	$	59.3		$	31.7		$	27.6
Net Unrealized Gains (Losses) on Cash Flow Hedges		(2.6	)		2.1			(4.7	)
Net Foreign Currency Adjustments		(1.8	)		(0.1	)		(1.7	)
Net Pension and Other Postretirement Benefit Adjustments		(328.6	)		12.3			(340.9	)
Total	$	(273.7	)	$	46.0		$	(319.7	)

(In Millions)	Balance at June 30, 2014			Net Change			Balance at December 31, 2013
Net Unrealized Gains (Losses) on Securities Available for Sale	$	44.0		$	38.0		$	6.0
Net Unrealized Gains (Losses) on Cash Flow Hedges		3.9			1.0			2.9
Net Foreign Currency Adjustments		0.2			(6.9	)		7.1
Net Pension and Other Postretirement Benefit Adjustments		(253.3	)		7.0			(260.3	)
Total	$	(205.2	)	$	39.1		$	(244.3	)

63

Notes to Consolidated Financial Statements (continued)

Table 52: Details of Changes in Accumulated Other Comprehensive Income (Loss)

	Three Months Ended June 30,
	2015									2014
(In Millions)	Before Tax			Tax Effect			After Tax			Before Tax			Tax Effect			After Tax
Unrealized Gains (Losses) on Securities Available for Sale
Noncredit-Related Unrealized Losses on Securities OTTI	$	—		$	—		$	—		$	(3.3	)	$	1.3		$	(2.0	)
Other Unrealized Gains (Losses) on Securities Available for Sale		(36.4	)		13.8			(22.6	)		57.3			(21.4	)		35.9
Reclassification Adjustment for (Gains) Losses Included in Net Income		0.4			(0.2	)		0.2			(0.4	)		—			(0.4	)
Net Change		(36.0	)		13.6			(22.4	)		53.6			(20.1	)		33.5
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		4.8			(2.4	)		2.4			(1.3	)		0.6			(0.7	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		1.3			(0.5	)		0.8			0.2			(0.1	)		0.1
Net Change		6.1			(2.9	)		3.2			(1.1	)		0.5			(0.6	)
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		53.0			2.4			55.4			13.4			(0.3	)		13.1
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)		1.5			(0.5	)		1.0			(1.0	)		0.4			(0.6	)
Net Investment Hedge Gains (Losses)		(81.1	)		30.5			(50.6	)		(29.6	)		11.5			(18.1	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		(26.6	)		32.4			5.8			(17.2	)		11.6			(5.6	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		9.7			(3.6	)		6.1			6.1			(2.5	)		3.6
Net Change	$	9.7		$	(3.6	)	$	6.1		$	6.1		$	(2.5	)	$	3.6

64

Notes to Consolidated Financial Statements (continued)

	Six Months Ended June 30,
	2015									2014
(In Millions)	Before Tax			Tax Effect			After Tax			Before Tax			Tax Effect			After Tax
Unrealized Gains (Losses) on Securities Available for Sale
Noncredit-Related Unrealized Losses on Securities OTTI	$	—		$	—		$	—		$	(1.8	)	$	0.7		$	(1.1	)
Other Unrealized Gains (Losses) on Securities Available for Sale		50.4			(18.9	)		31.5			63.0			(23.6	)		39.4
Reclassification Adjustment for (Gains) Losses Included in Net Income		0.3			(0.1	)		0.2			(0.3	)		—			(0.3	)
Net Change		50.7			(19.0	)		31.7			60.9			(22.9	)		38.0
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		0.1			0.6			0.7			1.1			(0.3	)		0.8
Reclassification Adjustment for (Gains) Losses Included in Net Income		2.3			(0.9	)		1.4			0.4			(0.2	)		0.2
Net Change		2.4			(0.3	)		2.1			1.5			(0.5	)		1.0
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		(37.1	)		14.6			(22.5	)		19.9			(1.2	)		18.7
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)		0.5			(0.2	)		0.3			(1.6	)		0.6			(1.0	)
Net Investment Hedge Gains (Losses)		35.5			(13.4	)		22.1			(40.2	)		15.6			(24.6	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		(1.1	)		1.0			(0.1	)		(21.9	)		15.0			(6.9	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		19.2			(6.9	)		12.3			12.5			(5.5	)		7.0
Net Change	$	19.2		$	(6.9	)	$	12.3		$	12.5		$	(5.5	)	$	7.0

65

Notes to Consolidated Financial Statements (continued)

The following table provides the location and before-tax amounts of reclassifications out of AOCI during the three and six months ended June 30, 2015.

Table 53: Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)

(In Millions)	Location of Reclassification Adjustments Recognized in Income	Amount of Reclassification Adjustments Recognized in Income
		Three Months Ended		Six Months Ended
		June 30, 2015
Securities Available for Sale
Realized (Gains) Losses on Securities Available for Sale	Investment Security Gains (Losses), net	$	0.4	$	0.3
Realized (Gains) Losses on Cash Flow Hedges
Foreign Exchange Contracts	Other Operating Income/Expense		1.3		2.3
Pension and Other Postretirement Benefit Adjustments
Amortization of Net Actuarial (Gain) Loss	Employee Benefits		9.7		19.3
Amortization of Prior Service Cost	Employee Benefits		—		(0.1	)
Gross Reclassification Adjustment		$	9.7	$	19.2

13. Net Income Per Common Share Computations — The computations of net income per common share are presented in the following table.

Table 54: Net Income per Common Share

	Three Months Ended June 30,				Six Months Ended June 30,
($ In Millions Except Per Common Share Information)	2015		2014		2015		2014
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding		233,149,020		236,012,703		233,264,453		236,607,125
Net Income	$	269.2	$	181.9	$	499.9	$	363.3
Less: Dividends on Preferred Stock		5.8		—		11.7		—
Net Income Applicable to Common Stock		263.4		181.9		488.2		363.3
Less: Earnings Allocated to Participating Securities		4.1		3.1		7.8		6.0
Earnings Allocated to Common Shares Outstanding		259.3		178.8		480.4		357.3
Basic Net Income Per Common Share	$	1.11	$	0.76	$	2.06	$	1.51
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding		233,149,020		236,012,703		233,264,453		236,607,125
Plus: Dilutive Effect of Share-based Compensation		2,083,815		1,740,976		1,996,158		1,791,489
Average Common and Potential Common Shares		235,232,835		237,753,679		235,260,611		238,398,614
Earnings Allocated to Common and Potential Common Shares	$	259.3	$	178.8	$	480.4	$	357.3
Diluted Net Income Per Common Share		1.10		0.75		2.04		1.50

Note: For the three months ended June 30, 2015, there were no common stock equivalents excluded in the computation of diluted net income per common share. Common stock equivalents of 748,268 for the six months

66

Notes to Consolidated Financial Statements (continued)

ended June 30, 2015, and 1,981,304 and 1,980,947 for the three and six months ended June 30, 2014, respectively, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive.

14. Net Interest Income — The components of net interest income were as follows:

Table 55: Net Interest Income

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Interest Income
Loans and Leases	$	171.0	$	185.8	$	354.9	$	368.7
Securities — Taxable		77.2		63.5		153.7		132.9
— Non-Taxable		1.2		1.8		2.6		4.1
Interest-Bearing Deposits with Banks		28.7		33.6		55.3		65.7
Federal Reserve Deposits and Other		10.7		9.1		21.1		17.8
Total Interest Income		288.8		293.8		587.6		589.2
Interest Expense
Deposits		18.4		22.4		35.1		42.5
Federal Funds Purchased		0.1		0.3		0.3		0.6
Securities Sold Under Agreements to Repurchase		0.1		0.1		0.2		0.2
Other Borrowings		1.1		0.8		2.3		1.5
Senior Notes		11.9		13.7		23.5		31.2
Long-Term Debt		5.5		9.4		13.3		19.8
Floating Rate Capital Debt		0.5		0.5		1.1		1.1
Total Interest Expense		37.6		47.2		75.8		96.9
Net Interest Income	$	251.2	$	246.6	$	511.8	$	492.3

Note: Interest income for the three and six months ended June 30, 2015, was earned on cash and due from banks of $1.1 billion and $3.3 billion, respectively, and interest-bearing deposits with banks of $15.7 billion as of June 30, 2015.

15. Income Taxes — Income tax expense for the three and six months ended June 30, 2015 of $142.2 million and $261.5 million was recorded representing an effective tax rate of 34.6% and 34.4%, respectively. The prior-year three- and six-month provisions for income taxes were $88.8 million and $176.9 million, representing an effective tax rate of 32.8% for both the three and six months then ended.

67

Notes to Consolidated Financial Statements (continued)

16. Pension and Postretirement Health Care — The following tables set forth the net periodic pension and postretirement benefit expense for Northern Trust’s U.S. and non-U.S. pension plans, supplemental pension plan, and postretirement health care plan for the three and six months ended June 30, 2015 and 2014.

Table 56: Net Periodic Pension Expense (Benefit)

Net Periodic Pension Expense U.S. Plan	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2015			2014			2015			2014
Service Cost	$	9.4		$	8.2		$	18.9		$	16.4
Interest Cost		11.2			11.1			22.4			22.2
Expected Return on Plan Assets		(24.1	)		(24.5	)		(48.2	)		(48.9	)
Amortization
Net Actuarial Loss		7.4			5.3			14.8			10.7
Prior Service Cost		(0.1	)		(0.1	)		(0.2	)		(0.2	)
Net Periodic Pension Expense	$	3.8		$	—		$	7.7		$	0.2

Net Periodic Pension Expense (Benefit) Non U.S. Plans	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2015			2014			2015			2014
Interest Cost	$	1.4		$	1.8		$	2.8		$	3.5
Expected Return on Plan Assets		(1.4	)		(1.8	)		(2.9	)		(3.5	)
Net Actuarial Loss Amortization		0.4			(0.4	)		0.8			(0.8	)
Net Periodic Pension Expense (Benefit)	$	0.4		$	(0.4	)	$	0.7		$	(0.8	)

Net Periodic Pension Expense Supplemental Plan	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Service Cost	$	0.9	$	0.7	$	1.8	$	1.5
Interest Cost		1.2		1.2		2.5		2.4
Amortization
Net Actuarial Loss		1.9		1.4		3.7		2.9
Prior Service Cost		0.1		0.1		0.1		0.2
Net Periodic Pension Expense	$	4.1	$	3.4	$	8.1	$	7.0

Net Periodic Postretirement Expense (Benefit) Postretirement Health Care Plan	Three Months Ended June 30,					Six Months Ended June 30,
(In Millions)	2015		2014			2015		2014
Service Cost	$	0.1	$	0.1		$	0.1	$	0.1
Interest Cost		0.4		0.3			0.7		0.7
Amortization
Net Actuarial (Gain)		—		(0.2	)		—		(0.3	)
Net Periodic Postretirement Expense (Benefit)	$	0.5	$	0.2		$	0.8	$	0.5

17. Share-Based Compensation Plans — The Northern Trust Corporation 2012 Stock Plan provides for the grant of nonqualified stock options, incentive stock options, stock appreciation rights, stock awards, restricted stock units and performance stock units.

Total compensation expense for share-based payment arrangements and the associated tax impacts were as follows for the three and six months ended June 30, 2015 and 2014.

68

Notes to Consolidated Financial Statements (continued)

Table 57: Total Compensation Expense for Share-Based Payment Arrangements

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Restricted Stock Unit Awards	$	13.4	$	14.9	$	26.9	$	29.0
Stock Options		1.7		2.1		7.7		8.5
Performance Stock Units		4.1		3.2		7.5		5.8
Total Share-Based Compensation Expense		19.2		20.2		42.1		43.3
Tax Benefits Recognized	$	7.2	$	7.5	$	15.8	$	16.2

18. Variable Interest Entities — Variable Interest Entities (VIEs) are defined within GAAP as entities that 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. 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 these VIEs given it lacks the power to direct the activities that most significantly impact the economic performance of the VIEs.

Northern Trust’s maximum exposure to loss as a result of its involvement with the leveraged lease trust VIEs is limited to the carrying amounts of its leveraged lease investments. As of June 30, 2015, and December 31, 2014, the carrying amounts of these investments, which are included in loans and leases in the consolidated balance sheets, were $507.0 million and $547.6 million, respectively. Northern Trust’s funding requirements relative to the VIEs are limited to its invested capital. Northern Trust has no other liquidity arrangements or obligations to purchase assets of the 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 LLCs in which Northern Trust invests as a limited partner/investor member through equity contributions. The economic performance of the community development projects, 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 projects 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 VIEs.

69

Notes to Consolidated Financial Statements (continued)

Northern Trust’s maximum exposure to loss as a result of its involvement with community development projects is limited to the carrying amount of its investments, including any undrawn commitments. As of June 30, 2015, and December 31, 2014, the carrying amount of investments in community development projects that generate tax credits, included in other assets in the consolidated balance sheets, totaled $187.3 million and $208.9 million, respectively. As of June 30, 2015, and December 31, 2014, liabilities related to undrawn commitments on investments in tax credit community development projects, included in other liabilities in the consolidated balance sheets, totaled $12.1 million and $15.6 million, 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.

Affordable housing tax credits and other tax benefits attributable to community development projects totaled $13.3 million and $13.9 million, respectively, for the three months ended June 30, 2015 and 2014, and $26.5 million and $28.7 million, respectively, for the six months ended June 30, 2015 and 2014.

Trust Preferred Securities. In 1997, Northern Trust issued Floating Rate Capital Securities, Series A and Series B, through NTC Capital I and NTC Capital II, respectively, statutory business trusts wholly-owned by the Corporation. The sole assets of the trusts are subordinated debentures of the Corporation that have the same interest rates and maturity dates as the corresponding distribution rates and redemption dates of the Floating Rate Capital Securities. NTC Capital I and NTC Capital II are considered VIEs; however, as the sole asset of each trust is a receivable from the Corporation and proceeds to the Corporation from the receivable exceed the Corporation’s investment in the VIEs’ equity shares, the Corporation is not permitted to consolidate the trusts, even though the Corporation owns all of the voting equity shares of the trusts, has fully guaranteed the trusts’ obligations and has the right to redeem the preferred securities in certain circumstances. Northern Trust recognizes the subordinated debentures in its consolidated balance sheets as long-term liabilities.

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.

In June 2015, Northern Trust voluntarily elected to contribute an aggregate $45.8 million of cash to four constant-dollar-net-asset-value investment funds (Funds) for which it serves as asset manager to bring the net asset values of such funds to $1.00. The contributions, which were recorded to other operating expense in the consolidated statements of income, resulted in a pre-tax charge of $45.8 million. As of June 30, 2015 the net assets held by the Funds totaled $37.5 billion.

Under GAAP, the contributions noted above are deemed to reflect Northern Trust’s implicit interest in the credit risk of the Funds, which must be considered when determining whether it is the primary beneficiary of the Funds. In determining whether Northern Trust is the primary beneficiary of the Funds, Northern Trust used an expected loss calculation based on the characteristics of the underlying investments in the Funds to estimate the expected losses related to interest rate and credit risk, and also considered the relative rights and obligations of each of the applicable variable interest holders. Upon consideration of this analysis, Northern Trust determined that it is not the primary beneficiary of the Funds, as interest rate risk was determined to be the primary driver of expected losses within such funds. Similarly, based on its analysis, including consideration of the contributions noted above, Northern Trust has also determined that it is not the primary beneficiary of any other investment funds for which it serves as asset manager under GAAP. Accordingly, Northern Trust is not required to consolidate the Funds or any other investment funds for which it serves as asset manager within its consolidated balance sheets.

Any potential future support of the Funds will be at the discretion of Northern Trust after an evaluation of the specific facts and circumstances and with careful consideration as to the potential impact on Northern Trust’s regulatory capital levels and other operational needs. As of June 30, 2015, Northern Trust has no exposure to loss from its implicit interest in such Funds as there are no current plans to provide any further support to the Funds.

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Notes to Consolidated Financial Statements (continued)

19. 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 $36.4 billion and $35.1 billion as of June 30, 2015, and December 31, 2014, 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 were $4.2 billion and $4.5 billion as of June 30, 2015, and December 31, 2014, respectively.

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 Counterparty Risk Management 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 June 30, 2015, and December 31, 2014, subject to indemnification was $105.5 billion and $98.1 billion, respectively. Because of the credit quality of the borrowers and the requirement to collateralize fully securities borrowed, management believes that the exposure to credit loss from this activity is not significant and no liability was recorded as of June 30, 2015, or December 31, 2014, related to these indemnifications.

Legal Proceedings. In the normal course of business, the Corporation and its subsidiaries are routinely defendants in or parties to a number of pending and threatened legal actions, including, but not limited to, actions brought on behalf of various claimants or classes of claimants, regulatory matters, employment matters and challenges from tax authorities regarding the amount of taxes due. In certain of these actions and proceedings, claims for substantial monetary damages or adjustments to recorded tax liabilities are asserted.

Based on current knowledge, after consultation with legal counsel and after taking into account current accruals, management does not believe that losses, if any, arising from pending litigation or threatened legal actions or regulatory matters 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.”

For the reasons set out in this paragraph, the outcome of some matters is inherently difficult to predict and/or the range of loss cannot be reasonably estimated. This may be the case in matters that (i) will be decided by a jury,

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Notes to Consolidated Financial Statements (continued)

(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 the 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 June 30, 2015, the Corporation has estimated the upper end of the range of reasonably possible losses for these matters to be approximately $125 million in the aggregate. This aggregate amount 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 will vary significantly from the current estimate.

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

A number of participants in Northern Trust’s securities lending program, which is associated with its asset servicing business, have commenced either individual lawsuits or purported class actions in which they claim, among other things, that Northern Trust failed to exercise prudence in the investment management of the collateral received from the borrowers of the securities, resulting in losses that they seek to recover. The cases assert various contractual, statutory and common law claims, including claims for breach of fiduciary duty under common law and under the Employee Retirement Income Security Act (ERISA). In 2013, Northern Trust recorded a $19.2 million pre-tax charge in connection with an agreement to resolve certain claims related to two of these lawsuits, the settlement of which remains pending while awaiting court approval. Other lawsuits and claims related to securities lending are not part of the proposed settlement, and remain pending.

As previously disclosed in April 2014, Northern Trust remains subject to an investigation by the U.S. Securities and Exchange Commission (SEC) related to Northern Trust’s securities lending activities. Northern Trust continues to cooperate with the SEC in this investigation.

In January 2015, the Public Prosecutor’s Office of France recommended that certain charges be brought against Northern Trust Fiduciary Services (Guernsey) Limited (NTFS), an indirect subsidiary of the Corporation, relating to the administration of two trusts for which NTFS serves as trustee. In April 2015, a French investigating magistrate judge charged NTFS with complicity in estate tax fraud. NTFS will contest the criminal charge in the French court. 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 the covered litigation noted below, 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.

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Notes to Consolidated Financial Statements (continued)

Certain members of Visa U.S.A. are obligated to indemnify Visa for losses resulting from certain litigation relating to interchange fees (the covered litigation). On October 19, 2012, Visa signed a settlement agreement with plaintiff representatives for binding settlement of the covered litigation. On January 14, 2014, the trial court entered a final judgment order approving the settlement with the class plaintiffs, which is subject to appeal. A number of objectors have appealed from that order and more than 30 opt-out cases have been filed by merchants in various federal district courts. The ultimate resolution of the covered litigation and the timing for removal of the selling restrictions on the Visa Class B common shares are uncertain.

In the quarter ended June 30, 2015, Northern Trust recorded a $99.9 million net pre-tax gain on the sale of 1.0 million of its Visa Class B common shares. This sale does 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. As of June 30, 2015, Northern Trust continued to hold approximately 5.2 million Visa Class B common shares, which are recorded at their original cost basis of zero.

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 include foreign exchange contracts, interest rate contracts and other contracts.

Northern Trust’s primary risks associated with foreign exchange and interest rate instruments are the possibility that interest rates or foreign exchange rates could change in an unanticipated manner, resulting in higher costs or a loss in the underlying value of the instrument. These risks are mitigated by establishing limits, monitoring the level of actual positions taken against such established limits and monitoring the level of any interest rate sensitivity gaps created by such positions. When establishing position limits, market liquidity and volatility, as well as experience in each market, are taken into account.

Credit risk associated with derivative instruments relates to the failure of the counterparty to pay based on the contractual terms of the agreement, and is generally limited to the unrealized fair value gains on these instruments, net of any cash collateral received. The amount of credit risk will increase or decrease during the lives of the instruments as interest rates, foreign exchange rates or other underlying exposures 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.

All derivative financial instruments, whether designated as hedges or not, are recorded in the consolidated balance sheets at fair value within other assets or other liabilities. As noted in the discussions below, the manner in which changes in the fair value of a derivative is accounted for in the consolidated statements of income depends on whether the contract has been designated as a hedge and qualifies for hedge accounting under GAAP. 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. Derivative assets and liabilities recorded in the consolidated balance sheets were each reduced by $1.3 billion and $1.9 billion as of June 30, 2015, and December 31, 2014, respectively, as a result of master netting arrangements and similar agreements in place. Derivative assets and liabilities recorded at June 30, 2015, also reflect reductions of $387.9 million and $151.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties, respectively. This compares with reductions of derivative assets and liabilities of $315.8 million and $1.2 billion, respectively, at December 31, 2014. Additional cash collateral received from and deposited with derivative counterparties totaling $127.2 million and $41.5 million, respectively, as of June 30, 2015, and $19.6 million and $153.2 million, respectively, as of December 31, 2014, were not offset against

73

Notes to Consolidated Financial Statements (continued)

derivative assets and liabilities in the consolidated balance sheets as the amounts exceeded the net derivative positions with those counterparties. Northern Trust centrally clears eligible interest rate derivative instruments as required under Title VII of the Dodd-Frank Wall Street Reform and Consumer Protection Act. Securities posted as collateral for these transactions totaled $17.2 million and $27.4 million at June 30, 2015, and December 31, 2014, respectively, are not offset against derivative assets and liabilities in the consolidated balance sheets, and the counterparty receiving the securities as collateral does not have the right to repledge or sell the securities.

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 $57.5 million and $299.5 million at June 30, 2015, and December 31, 2014, respectively. Cash collateral amounts deposited with derivative counterparties on those dates included $22.4 million and $272.9 million, respectively, posted against these liabilities, resulting in a net maximum amount of termination payments that could have been required at June 30, 2015, and December 31, 2014, of $35.1 million and $26.6 million, respectively. Accelerated settlement of these liabilities would not have a material effect on the consolidated financial position or liquidity of Northern Trust.

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 purposes and risk management. 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 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 offsetting contracts with outside counterparties. It 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.

Client-Related and Trading Derivative Instruments. Approximately 97% of Northern Trust’s derivatives outstanding at June 30, 2015, and December 31, 2014, measured on a notional value basis, relate to client-related and trading activities. 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.

The following table shows the notional and fair values of client-related and trading derivative financial instruments. 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, which is significantly less than the notional amount.

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Notes to Consolidated Financial Statements (continued)

Table 58: Notional and Fair Values of Client-Related and Trading Derivative Financial Instruments

	June 30, 2015						December 31, 2014
	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	264,964.1	$	2,451.3	$	2,416.7	$	257,568.7	$	4,149.5	$	4,072.0
Interest Rate Contracts		5,576.0		96.5		93.1		5,353.8		105.5		101.3
Total	$	270,540.1	$	2,547.8	$	2,509.8	$	262,922.5	$	4,255.0	$	4,173.3

Changes in the fair value of client-related and trading derivative instruments are recognized currently in income. The following table shows the location and amount of gains and losses recorded in the consolidated statements of income for the three and six months ended June 30, 2015, and 2014.

Table 59: Location and Amount of Gains and Losses Recorded in Income

		Amount of Derivative Gain/(Loss) Recognized in Income
	Location of Derivative Gain/(Loss) Recognized in Income	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)		2015		2014		2015		2014
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	74.8	$	52.9	$	146.4	$	103.0
Interest Rate Contracts	Security Commissions and Trading Income		3.0		2.1		7.9		4.0
Total		$	77.8	$	55.0	$	154.3	$	107.0

Risk Management Instruments. Northern Trust uses derivative instruments to hedge its exposure to foreign currency, interest rate and other risks. 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.

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.

75

Notes to Consolidated Financial Statements (continued)

The following table identifies the types and classifications of derivative instruments formally designated as hedges under GAAP and used by Northern Trust to manage risk, their notional and fair values, and the respective risks addressed.

Table 60: Notional and Fair Values of Designated Risk Management Derivative Financial Instruments

			June 30, 2015						December 31, 2014
	Derivative Instrument	Risk Classification	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)					Asset		Liability				Asset		Liability
Fair Value Hedges
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate	$	2,720.4	$	11.7	$	25.3	$	2,859.5	$	12.7	$	28.5
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Rate		1,250.0		93.2		2.1		1,250.0		112.8		2.0
Cash Flow Hedges
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		413.4		6.9		14.8		344.9		6.0		14.8
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate		10.0		—		—		10.0		—		—
Available for Sale Investment Securities	Interest Rate Option Contracts	Interest Rate		725.0		2.8		—		625.0		1.3		—
Net Investment Hedges
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		1,870.1		22.9		43.2		1,795.4		118.9		3.4
Total			$	6,988.9	$	137.5	$	85.4	$	6,884.8	$	251.7	$	48.7

In addition to the above, Sterling denominated debt, totaling $243.9 million at December 31, 2014, was designated as a hedge of the foreign exchange associated with the net investment in certain non-U.S. affiliates. This debt matured during the quarter ended March 31, 2015.

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. For a fair value hedge, 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 recorded currently in income. The following table shows the location and amount of derivative gains and losses recorded in the consolidated statements of income related to fair value hedges for the three and six months ended June 30, 2015 and 2014.

Table 61: Location and Amount of Derivative Gains and Losses Recorded in Income

		Location of Derivative Gain/(Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
	Derivative Instrument		Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)			2015			2014			2015			2014
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Income	$	5.0		$	(14.9	)	$	(12.3	)	$	(27.0	)
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Expense		(27.7	)		27.7			2.1			60.2
Total			$	(22.7	)	$	12.8		$	(10.2	)	$	33.2

Northern Trust applies the “shortcut” method of accounting, available under GAAP, to substantially all of its fair value hedges, which assumes there is no ineffectiveness in a hedge. As a result, changes recorded in the fair

76

Notes to Consolidated Financial Statements (continued)

value of the hedged item are equal to the offsetting gain or loss on the derivative and are reflected in the same line item. For fair value hedges that do not qualify for the “shortcut” method of accounting, Northern Trust utilizes regression analysis, the “long-haul” method of accounting, in assessing whether the hedging relationships are highly effective at inception and quarterly thereafter. Ineffectiveness resulting from fair value hedges is recorded in either interest income or interest expense. There was no ineffectiveness or changes in the fair value of hedged items recognized in earnings for fair value hedges accounted for under the “long-haul” method of accounting during the three- and six-month periods ended June 30, 2015, and 2014.

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. The effective portion of changes in the fair value of such derivatives is recognized in AOCI, a component of stockholders’ equity, and there is no change in the accounting for the hedged item. Balances in AOCI are reclassified to earnings when the hedged forecasted transaction impacts earnings. Northern Trust applies the “shortcut” method of accounting for cash flow hedges of certain available for sale investment securities. For cash flow hedges of certain other available for sale investment securities and forecasted foreign currency denominated revenue and expenditure transactions, Northern Trust closely matches all terms of the hedged item and the hedging derivative at inception and on an ongoing basis which limits hedge ineffectiveness. For cash flow hedges of available for sale investment securities, to the extent all terms are not perfectly matched, effectiveness is assessed using regression analysis and any ineffectiveness is measured using the hypothetical derivative method. For cash flow hedges of forecasted foreign currency denominated revenue and expenditure transactions, to the extent all terms are not perfectly matched, effectiveness is assessed using the dollar-offset method and any ineffectiveness is measured using the hypothetical derivative method. There was no ineffectiveness recognized in earnings for cash flow hedges during the three and six months ended June 30, 2015 and 2014. As of June 30, 2015, 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 cash flow hedge derivative gains and losses recognized in AOCI and the amounts reclassified to earnings during the three and six months ended June 30, 2015 and 2014.

Table 62: Cash Flow Hedge Derivative Gains and Losses Recognized in AOCI and Reclassified to Earnings

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Option Contracts (Before Tax)
Three Months Ended June 30,	2015			2014			2015			2014
Net Gain/(Loss) Recognized in AOCI	$	6.5		$	(1.3	)	$	(1.7	)	$	—
Net Gain/(Loss) Reclassified from AOCI to Net Income
Other Operating Income		(2.3	)		1.9			—			—
Interest Income		—			—			1.2			—
Other Operating Expense		(0.3	)		—			—			—
Total	$	(2.6	)	$	1.9		$	1.2		$	—

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Option Contracts (Before Tax)
Six Months Ended June 30,	2015			2014			2015		2014
Net Gain/(Loss) Recognized in AOCI	$	(1.4	)	$	1.1		$	1.5	$	—
Net Gain/(Loss) Reclassified from AOCI to Net Income
Other Operating Income		(3.9	)		2.7			—		—
Interest Income		—			—			2.4		—
Other Operating Expense		(0.8	)		(0.2	)		—		—
Total	$	(4.7	)	$	2.5		$	2.4	$	—

77

Notes to Consolidated Financial Statements (continued)

During the three and six months ended June 30, 2015 and 2014, there were no transactions discontinued due to the original forecasted transactions no longer being probable of occurring. It is estimated that a net loss of $6.4 million will be reclassified into net income within the next twelve months relating to cash flow hedges of foreign-currency-denominated transactions. It is estimated that a net gain of $3.8 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 investment securities.

Certain foreign exchange contracts and qualifying nonderivative instruments 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. The effective portion of changes in the fair value of the hedging instrument is recognized in AOCI consistent with the related translation gains and losses of the hedged net investment. For net investment hedges, all critical terms of the hedged item and the hedging instrument are matched at inception and on an ongoing basis to minimize the risk of hedge ineffectiveness. To the extent all terms are not perfectly matched, any ineffectiveness is measured using the hypothetical derivative method. Ineffectiveness resulting from net investment hedges is recorded in other operating income. There was no ineffectiveness recorded during the three and six months ended June 30, 2015 and 2014. Amounts recorded in AOCI are reclassified to net income only upon the sale or liquidation of an investment in a non-U.S. branch or subsidiary.

The following table provides net investment hedge gains and losses recognized in AOCI during the three and six months ended June 30, 2015 and 2014.

Table 63: Net Investment Hedge Gains and Losses Recognized in AOCI

	Hedging Gain/(Loss) Recognized in OCI (Before Tax)
	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2015			2014			2015		2014
Foreign Exchange Contracts	$	(81.1	)	$	(22.9	)	$	30.5	$	(31.9	)
Sterling Denominated Subordinated Debt		—			(6.7	)		5.0		(8.3	)
Total	$	(81.1	)	$	(29.6	)	$	35.5	$	(40.2	)

Derivatives that are not formally designated as hedges under GAAP are entered into for risk management purposes. Foreign exchange contracts are 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. For a description of the swap related to the sale of certain Visa Class B common shares, see “Level 3” under Note 3 – Fair Value Measurements. The following table identifies the types of risk management derivative instruments not formally designated as hedges and their notional amounts and fair values.

Table 64: Notional and Fair Values of Non-Designated Risk Management Derivative Instruments

(In Millions)	June 30, 2015						December 31, 2014
	Notional Value		Fair Value				Notional Value		Fair Value
			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	205.6	$	1.0	$	0.7	$	246.3	$	0.8	$	5.3
Other Financial Derivatives (1)		110.7		—		11.3		—		—		—
Total	$	316.3	$	1.0	$	12.0	$	246.3	$	0.8	$	5.3

(1) This line includes a swap related to the sale of certain Visa Class B common shares.

78

Notes to Consolidated Financial Statements (continued)

Changes in the fair value of derivative instruments not formally designated as hedges 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 six months ended June 30, 2015 and 2014.

Table 65: Location and Amount of Gains and Losses Recorded in Income for Non-Designated Risk Management Derivative Instruments

(In Millions)	Location of Derivative Gain/ (Loss) Recognized in Income		Amount of Derivative Gain/(Loss) Recognized in Income
			Three Months Ended June 30,					Six Months Ended June 30,
			2015			2014		2015			2014
Foreign Exchange Contracts		Other Operating Income		6.6			1.5		(2.1	)		0.8
Other Financial Derivatives (1)		Other Operating Income		(11.3	)		—		(11.3	)		—
Total			$	(4.7	)	$	1.5	$	(13.4	)	$	0.8

(1) This line includes a swap related to the sale of certain Visa Class B common shares.

21. Offsetting of Assets and Liabilities

The following tables provide information regarding the offsetting of derivative assets and securities purchased under agreements to resell within the consolidated balance sheets as of June 30, 2015, and December 31, 2014.

Table 66: Offsetting of Derivative Assets and Securities Purchased Under Agreements to Resell

June 30, 2015
(In Millions)	Gross Recognized Assets		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (3)
Derivative Assets (1)
Foreign Exchange Contracts Over the Counter (OTC)	$	2,093.4	$	1,232.9	$	860.5	$	—	$	860.5
Interest Rate Swaps OTC		167.8		30.3		137.5		—		137.5
Interest Rate Swaps Exchange Cleared		36.4		19.2		17.2		—		17.2
Other Financial Derivatives		—		—		—		—		—
Cross Product Netting Adjustment		—		27.7		—		—		—
Cross Product Collateral Adjustment		—		387.9		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		2,297.6		1,698.0		599.6		—		599.6
Total Derivatives Not Subject to a Master Netting Arrangement		388.7		—		388.7		—		388.7
Total Derivatives		2,686.3		1,698.0		988.3		—		988.3
Securities Purchased under Agreements to Resell (2)	$	1,000.0	$	—	$	1,000.0	$	1,000.0	$	—

79

Notes to Consolidated Financial Statements (continued)

December 31, 2014
(In Millions)	Gross Recognized Assets		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (3)
Derivative Assets (1)
Foreign Exchange Contracts OTC	$	3,442.8	$	1,889.8	$	1,553.0	$	—	$	1,553.0
Interest Rate Swaps OTC		183.9		32.1		151.8		—		151.8
Interest Rate Swaps Exchange Cleared		48.4		13.1		35.3		—		35.3
Cross Product Netting Adjustment		—		6.3		—		—		—
Cross Product Collateral Adjustment		—		315.8		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,675.1		2,257.1		1,418.0		—		1,418.0
Total Derivatives Not Subject to a Master Netting Arrangement		832.4		—		832.4		—		832.4
Total Derivatives		4,507.5		2,257.1		2,250.4		—		2,250.4
Securities Purchased under Agreements to Resell (2)	$	1,000.0	$	—	$	1,000.0	$	1,000.0	$	—

(1) Derivative assets are reported in other assets in the consolidated balance sheets. Other assets (excluding derivative assets) totaled $3,113.6 million and $3,614.7 million as of June 30, 2015, and December 31, 2014, respectively.

(2) Securities purchased under agreements to resell are reported in federal funds sold and securities purchased under agreements to resell in the consolidated balance sheets. Federal funds sold totaled $20.0 million and $62.7 million as of June 30, 2015, and December 31, 2014, respectively.

(3) 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 June 30, 2015, and December 31, 2014.

The following tables provide information regarding the offsetting of derivative liabilities and securities sold under agreements to repurchase within the consolidated balance sheets as of June 30, 2015, and December 31, 2014.

Table 67: Offsetting of Derivative Liabilities and Securities Sold Under Agreements to Repurchase

June 30, 2015
(In Millions)	Gross Recognized Liabilities		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (2)
Derivative Liabilities (1)
Foreign Exchange Contracts OTC	$	1,570.5	$	1,232.9	$	337.6	$	—	$	337.6
Interest Rate Swaps OTC		101.3		30.3		71.0		—		71.0
Interest Rate Swaps Exchange Cleared		19.2		19.2		—		—		—
Other Financial Derivatives		11.3		—		11.3		—		11.3
Cross Product Netting Adjustment		—		27.7		—		—		—
Cross Product Collateral Adjustment		—		151.7		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		1,702.3		1,461.8		240.5		—		240.5
Total Derivatives Not Subject to a Master Netting Arrangement		904.9		—		904.9		—		904.9
Total Derivatives		2,607.2		1,461.8		1,145.4		—		1,145.4
Securities Sold under Agreements to Repurchase	$	29.8	$	—	$	29.8	$	29.8	$	—

80

Notes to Consolidated Financial Statements (continued)

December 31, 2014
(In Millions)	Gross Recognized Liabilities		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (2)
Derivative Liabilities (1)
Foreign Exchange Contracts OTC	$	3,431.0	$	1,889.8	$	1,541.2	$	—	$	1,541.2
Interest Rate Swaps OTC		118.7		32.1		86.6		—		86.6
Interest Rate Swaps Exchange Cleared		13.1		13.1		—		—		—
Cross Product Netting Adjustment		—		6.3		—		—		—
Cross Product Collateral Adjustment		—		1,232.0		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,562.8		3,173.3		389.5		—		389.5
Total Derivatives Not Subject to a Master Netting Arrangement		664.5		—		664.5		—		664.5
Total Derivatives		4,227.3		3,173.3		1,054.0		—		1,054.0
Securities Sold under Agreements to Repurchase	$	885.1	$	—	$	885.1	$	885.1	$	—

(1) Derivative liabilities are reported in other liabilities in the consolidated balance sheets. Other liabilities (excluding derivative liabilities) totaled $2,519.5 million and $2,794.1 million as of June 30, 2015, and December 31, 2014, respectively.

(2) 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 June 30, 2015, and December 31, 2014.

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 set off 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.

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. Northern Trust centrally clears those interest rate derivative instruments addressed under Title VII of the Dodd-Frank Wall Street Reform and Consumer Protection Act. These transactions are subject to an agreement similar to a master netting arrangement which has the same rights of offset as described above.

81

Item 4. Controls and Procedures

As of June 30, 2015, 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 June 30, 2015, 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.

PART II — OTHER INFORMATION

Item 1. Legal Proceedings

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

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 June 30, 2015.

Table 68: Repurchases of Common Stock

Period	Total Number of Shares Purchased (1)		Average Price Paid per Share		Total Number of Shares Purchased as Part of a Publicly Announced Plan (2)		Maximum Number of Shares that May Yet Be Purchased Under the Plan
April 1-30, 2015		142,542	$	73.33		142,542		14,857,458
May 1-31, 2015		921,944		74.80		921,944		13,935,514
June 1-30, 2015		230,777		74.85		230,777		13,704,737
Total (Second Quarter)		1,295,263	$	74.64		1,295,263		13,704,737

(1) Includes shares purchased from employees in connection with equity plan transactions such as the surrender of shares to pay an option exercise price or tax withholding.

(2) Repurchases through April 21, 2015 were made pursuant to the repurchase program announced by the Corporation on April 15, 2014. On April 21, 2015, this program was terminated and replaced with a new repurchase program, announced on April 22, 2015, pursuant to which the Corporation’s board of directors authorized the Corporation to repurchase up to 15.0 million shares of the Corporation’s common stock. Repurchases after April 21, 2015 were made pursuant to the new repurchase program, which has no expiration date.

Item 6. Exhibits

A list of exhibits to this Form 10-Q is set forth on the Exhibit Index immediately preceding such exhibits and is incorporated herein by reference.

82

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: July 29, 2015	By:	/s/ S. Biff Bowman
		S. Biff Bowman Executive Vice President and Chief Financial Officer (Principal Financial Officer)
Date: July 29, 2015	By:	/s/ Jane Karpinski
		Jane Karpinski Senior Vice President and Controller (Principal Accounting Officer)

83

EXHIBIT INDEX

Exhibit Number	Description
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 June 30, 2015, formatted in Extensible Business Reporting Language (XBRL): (1) the Consolidated Balance Sheets as of June 30, 2015 and December 31, 2014, (2) the Consolidated Statements of Income for the three and six months ended June 30, 2015 and 2014, (3) the Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2015 and 2014, (4) the Consolidated Statements of Changes in Stockholders’ Equity for the six months ended June 30, 2015 and 2014, (5) the Consolidated Statements of Cash Flows for the six months ended June 30, 2015 and 2014, and (6) Notes to Consolidated Financial Statements

84

EX-31.1

Exhibit 31.1

Certification of CEO Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Frederick H. Waddell, certify that:

1. I have reviewed this report on Form 10-Q for the quarterly period ended June 30, 2015, 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/ Frederick H. Waddell
Date: July 29, 2015	Frederick H. Waddell
	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, S. Biff Bowman, certify that:

1. I have reviewed this report on Form 10-Q for the quarterly period ended June 30, 2015, 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/ S. Biff Bowman
Date: July 29, 2015	S. Biff Bowman
	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 June 30, 2015, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Frederick H. Waddell, as Chief Executive Officer of the Corporation, and S. Biff Bowman, 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/ Frederick H. Waddell

     Frederick H. Waddell

     Chief Executive Officer

     (Principal Executive Officer)

Date: July 29, 2015

     /s/ S. Biff Bowman

     S. Biff Bowman

     Chief Financial Officer

     (Principal Financial Officer)

Date: July 29, 2015

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.

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Net Interest Income (Tables)

6 Months Ended

Jun. 30, 2015

Components of Net Interest Income

The components of net interest income were as follows:

Table 55: Net Interest Income

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Interest Income
Loans and Leases	$	171.0	$	185.8	$	354.9	$	368.7
Securities — Taxable		77.2		63.5		153.7		132.9
— Non-Taxable		1.2		1.8		2.6		4.1
Interest-Bearing Deposits with Banks		28.7		33.6		55.3		65.7
Federal Reserve Deposits and Other		10.7		9.1		21.1		17.8
Total Interest Income		288.8		293.8		587.6		589.2
Interest Expense
Deposits		18.4		22.4		35.1		42.5
Federal Funds Purchased		0.1		0.3		0.3		0.6
Securities Sold Under Agreements to Repurchase		0.1		0.1		0.2		0.2
Other Borrowings		1.1		0.8		2.3		1.5
Senior Notes		11.9		13.7		23.5		31.2
Long-Term Debt		5.5		9.4		13.3		19.8
Floating Rate Capital Debt		0.5		0.5		1.1		1.1
Total Interest Expense		37.6		47.2		75.8		96.9
Net Interest Income	$	251.2	$	246.6	$	511.8	$	492.3

Note: Interest income for the three and six months ended June 30, 2015, was earned on cash and due from banks of $1.1 billion and $3.3 billion, respectively, and interest-bearing deposits with banks of $15.7 billion as of June 30, 2015.

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Remaining Maturity of Securities Available for Sale and Held to Maturity (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Available for Sale - Cost
Due in One Year or Less	$ 7,716.2
Due After One Year Through Five Years	19,130.6
Due After Five Years Through Ten Years	3,710.9
Due After Ten Years	1,182.8
Total	31,740.5
Held to Maturity - Amortized Cost
Due in One Year or Less	3,950.0
Due After One Year Through Five Years	2,976.6
Due After Five Years Through Ten Years	20.6
Due After Ten Years	43.6
Amortized Cost	6,990.8	$ 4,170.8
Available for Sale - Value
Due in One Year or Less	7,738.2
Due After One Year Through Five Years	19,196.1
Due After Five Years Through Ten Years	3,713.9
Due After Ten Years	1,187.4
Total	31,835.6
Held to Maturity - Fair Value
Due in One Year or Less	3,951.8
Due After One Year Through Five Years	2,990.7
Due After Five Years Through Ten Years	18.4
Due After Ten Years	25.5
Total	$ 6,986.4	$ 4,176.1

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Changes in Level 3 Assets (Detail) - Auction Rate Securities - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Assets Beginning Balance		$ 17.5	$ 98.5	$ 18.1	$ 98.9
Total Gains (Losses):
Included in Other Comprehensive Income	[1]	0.5	0.5	0.2	0.3
Purchases, Issues, Sales, and Settlements:
Sales		(1.2)		(1.2)	0.1
Settlements		(0.2)	(0.2)	(0.5)	(0.5)
Fair Value Assets Ending Balance		$ 16.6	$ 98.8	$ 16.6	$ 98.8

[1] Unrealized gains (losses) are included in net unrealized gains (losses) on securities available for sale in the consolidated statements of comprehensive income.

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Other Intangible Assets Subject to Amortization (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 186.9	$ 189.5
Less: Accumulated Amortization	135.7	129.5
Net Book Value	$ 51.2	$ 60.0

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Securities - Additional Information (Detail) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015 USD ($) Investment	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) Investment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Trading Securities and Other Trading Assets [Line Items]
Investment Security Gains (Losses), net	[1]	$ (0.4)	$ 0.4	$ (0.3)	$ (3.6)
Gross proceeds from sale of securities		4.5	264.2	106.5	463.9
Gross realized securities gains			0.4	0.1	0.7
Gross realized securities losses		0.4		0.4	0.4
Net impairment losses recognized in earnings		$ 0.0	$ 0.0	$ 0.0	$ 3.9
Number of securities in an unrealized loss position | Investment		524		524
Total Fair Value		$ 10,719.2		$ 10,719.2		$ 10,410.8
Total Unrealized Losses		62.8		62.8		$ 87.6
U.S. Government Sponsored Agency
Schedule of Trading Securities and Other Trading Assets [Line Items]
Total Unrealized Losses		16.1		16.1
Corporate Debt
Schedule of Trading Securities and Other Trading Assets [Line Items]
Total Unrealized Losses		$ 19.1		$ 19.1
Percent of corporate debt portfolio		37.00%		37.00%
Others | Community Reinvestment Act CRA
Schedule of Trading Securities and Other Trading Assets [Line Items]
Total Unrealized Losses		$ 23.8		$ 23.8
Auction Rate Securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Total Unrealized Losses		$ 0.6		$ 0.6
Other Asset-Backed | Floating Rate Securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Percentage of "other asset-backed" securities rated triple-A		99.60%		99.60%
Credit Rating				AAA
Other Asset-Backed | Floating Rate Securities | Upper Limit
Schedule of Trading Securities and Other Trading Assets [Line Items]
Average life				5 years

[1] Changes in Other-Than-Temporary-Impairment (OTTI) Losses $ - $ - $ - $ (4.6 ) Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI - - - 0.7 Other Security Gains (Losses), net (0.4 ) 0.4 (0.3 ) 0.3 Investment Security Gains (Losses), net $ (0.4 ) $ 0.4 $ (0.3 ) $ (3.6 )

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Computations of Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding	233,149,020	236,012,703	233,264,453	236,607,125
Net Income	$ 269.2	$ 181.9	$ 499.9	$ 363.3
Less: Dividends on Preferred Stock	5.8		11.7
Net Income Applicable to Common Stock	263.4	181.9	488.2	363.3
Less: Earnings Allocated to Participating Securities	4.1	3.1	7.8	6.0
Earnings Allocated to Common Shares Outstanding	$ 259.3	$ 178.8	$ 480.4	$ 357.3
Basic Net Income Per Common Share	$ 1.11	$ 0.76	$ 2.06	$ 1.51
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding	233,149,020	236,012,703	233,264,453	236,607,125
Plus: Dilutive Effect of Share-based Compensation	2,083,815	1,740,976	1,996,158	1,791,489
Average Common and Potential Common Shares	235,232,835	237,753,679	235,260,611	238,398,614
Earnings Allocated to Common and Potential Common Shares	$ 259.3	$ 178.8	$ 480.4	$ 357.3
Diluted Net Income Per Common Share	$ 1.10	$ 0.75	$ 2.04	$ 1.50

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Assets and Liabilities Measured at Fair Value on Recurring Basis Segregated by Fair Value Hierarchy Level (Detail) - USD ($) $ in Millions		Jun. 30, 2015		Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		$ 31,835.6		$ 29,558.5
Trading Account		1.2		4.7
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total Available for Sale and Trading Securities		31,836.8		29,563.2
Fair Value, Measurements, Recurring | Securities Investment
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		31,835.6		29,558.5
Trading Account		1.2		4.7
Fair Value, Measurements, Recurring | Securities Investment | U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		5,018.8		4,506.9
Fair Value, Measurements, Recurring | Securities Investment | Obligations of States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		4.5		4.6
Fair Value, Measurements, Recurring | Securities Investment | U.S. Government Sponsored Agency
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		16,765.4		16,389.2
Fair Value, Measurements, Recurring | Securities Investment | Non-U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		311.0		310.4
Fair Value, Measurements, Recurring | Securities Investment | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		3,734.8		3,577.7
Fair Value, Measurements, Recurring | Securities Investment | Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		1,982.2		1,907.5
Fair Value, Measurements, Recurring | Securities Investment | Supranational and Non-U.S. Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale				360.6
Fair Value, Measurements, Recurring | Securities Investment | Residential Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale				6.4
Fair Value, Measurements, Recurring | Securities Investment | Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		3,119.2		2,321.3
Fair Value, Measurements, Recurring | Securities Investment | Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		16.6		18.1
Fair Value, Measurements, Recurring | Securities Investment | Others
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		123.7		155.8
Fair Value, Measurements, Recurring | Securities Investment | Sub-Sovereign, Supranational and Non US Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		560.7
Fair Value, Measurements, Recurring | Securities Investment | Commercial Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		198.7
Fair Value, Measurements, Recurring | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets		988.3		2,250.4
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets		2,482.1		4,275.2
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets		204.2		232.3
Fair Value, Measurements, Recurring | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities		1,145.4		1,054.0
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities		2,475.4		4,095.5
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities		120.5		131.8
Fair Value, Measurements, Recurring | Other Liabilities | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	[1]	11.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total Available for Sale and Trading Securities		5,018.8		4,506.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Securities Investment
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		5,018.8		4,506.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Securities Investment | U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		5,018.8		4,506.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total Available for Sale and Trading Securities		26,801.4		25,038.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		26,800.2		25,033.5
Trading Account		1.2		4.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Obligations of States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		4.5		4.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | U.S. Government Sponsored Agency
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		16,765.4		16,389.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Non-U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		311.0		310.4
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		3,734.8		3,577.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		1,982.2		1,907.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Supranational and Non-U.S. Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale				360.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Residential Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale				6.4
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		3,119.2		2,321.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Others
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		123.7		155.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Sub-Sovereign, Supranational and Non US Agency Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		560.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Commercial Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		198.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets		2,686.3		4,507.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets		2,482.1		4,275.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets		204.2		232.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities		2,595.9		4,227.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities		2,475.4		4,095.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities		120.5		131.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total Available for Sale and Trading Securities		16.6		18.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Securities Investment
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		16.6		18.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Securities Investment | Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale		16.6		18.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities		11.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Other Liabilities | Other Financial Derivatives
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	[1]	11.3
Fair Value, Measurements, Recurring | Subject to master netting arrangement or similar arrangement | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets		(1,698.0)	[2]	(2,257.1)	[3]
Fair Value, Measurements, Recurring | Subject to master netting arrangement or similar arrangement | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities		$ (1,461.8)	[2]	$ (3,173.3)	[3]

[1] This line includes a swap related to the sale of certain Visa Class B common shares.

[2] 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 June 30, 2015, derivative assets and liabilities shown above also include reductions of $387.9 million and $151.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

[3] 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, 2014, derivative assets and liabilities shown above also include reductions of $315.8 million and $1.2 billion, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

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Loans and Leases (Tables)

6 Months Ended

Jun. 30, 2015

Amounts Outstanding for Loans and Leases by Segment and Class

Amounts outstanding for loans and leases, by segment and class, are shown below.

Table 41: Loans and Leases

(In Millions)	June 30, 2015			December 31, 2014
Commercial
Commercial and Institutional	$	8,999.1		$	8,381.9
Commercial Real Estate		3,651.4			3,333.3
Lease Financing, net		832.9			916.3
Non-U.S.		1,533.1			1,530.6
Other		288.4			191.5
Total Commercial		15,304.9			14,353.6
Personal
Residential Real Estate		9,369.0			9,782.6
Private Client		8,224.0			7,466.9
Other		55.9			37.1
Total Personal		17,648.9			17,286.6
Total Loans and Leases		32,953.8			31,640.2
Allowance for Credit Losses Assigned to Loans and Leases		(257.3	)		(267.0	)
Net Loans and Leases	$	32,696.5		$	31,373.2

Loan and Lease Segment and Class Balances Segregated by Borrower Ratings into "1 to 3", "4 to 5" and "6 to 9" (Watch List) Categories

Loan and lease segment and class balances as of June 30, 2015, and December 31, 2014, are provided below, segregated by borrower ratings into “1 to 3,” “4 to 5” and “6 to 9” (watch list), categories.

Table 42: Borrower Ratings

	June 30, 2015								December 31, 2014
(In Millions)	1 to 3 Category		4 to 5 Category		6 to 9 Category (Watch List)		Total		1 to 3 Category		4 to 5 Category		6 to 9 Category (Watch List)		Total
Commercial
Commercial and Institutional	$	5,820.5	$	3,071.1	$	107.5	$	8,999.1	$	5,340.9	$	2,947.3	$	93.7	$	8,381.9
Commercial Real Estate		1,596.8		1,988.7		65.9		3,651.4		1,371.7		1,861.8		99.8		3,333.3
Lease Financing, net		477.6		352.4		2.9		832.9		552.5		360.3		3.5		916.3
Non-U.S.		770.2		762.7		0.2		1,533.1		636.8		892.9		0.9		1,530.6
Other		186.4		102.0		—		288.4		108.1		83.4		—		191.5
Total Commercial		8,851.5		6,276.9		176.5		15,304.9		8,010.0		6,145.7		197.9		14,353.6
Personal
Residential Real Estate		2,794.7		6,195.2		379.1		9,369.0		3,148.0		6,207.0		427.6		9,782.6
Private Client		5,216.7		2,992.5		14.8		8,224.0		5,143.8		2,311.7		11.4		7,466.9
Other		36.1		19.8		—		55.9		21.1		16.0		—		37.1
Total Personal		8,047.5		9,207.5		393.9		17,648.9		8,312.9		8,534.7		439.0		17,286.6
Total Loans and Leases	$	16,899.0	$	15,484.4	$	570.4	$	32,953.8	$	16,322.9	$	14,680.4	$	636.9	$	31,640.2

Balances and Delinquency Status of Performing and Nonperforming Loans and Leases by Segment and Class as well as Total OREO and Nonperforming Asset Balances

The following tables provide balances and delinquency status of performing and nonperforming loans and leases by segment and class, as well as the total OREO and nonperforming asset balances, as of June 30, 2015, and December 31, 2014.

Table 43: Delinquency Status

June 30, 2015
(In Millions)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	8,880.3	$	5.5	$	87.5	$	2.4	$	8,975.7	$	23.4	$	8,999.1
Commercial Real Estate		3,590.5		19.4		11.3		4.2		3,625.4		26.0		3,651.4
Lease Financing, net		832.9		—		—		—		832.9		—		832.9
Non-U.S.		1,533.1		—		—		—		1,533.1		—		1,533.1
Other		288.4		—		—		—		288.4		—		288.4
Total Commercial		15,125.2		24.9		98.8		6.6		15,255.5		49.4		15,304.9
Personal
Residential Real Estate		9,196.0		6.5		6.4		1.9		9,210.8		158.2		9,369.0
Private Client		8,180.3		31.5		4.7		6.4		8,222.9		1.1		8,224.0
Other		55.9		—		—		—		55.9		—		55.9
Total Personal		17,432.2		38.0		11.1		8.3		17,489.6		159.3		17,648.9
Total Loans and Leases	$	32,557.4	$	62.9	$	109.9	$	14.9	$	32,745.1	$	208.7	$	32,953.8
								Other Real Estate Owned				10.1
								Total Nonperforming Assets			$	218.8

December 31, 2014
(In Millions)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	8,340.5	$	14.5	$	4.0	$	7.9	$	8,366.9	$	15.0	$	8,381.9
Commercial Real Estate		3,274.3		9.6		9.8		2.5		3,296.2		37.1		3,333.3
Lease Financing, net		916.3		—		—		—		916.3		—		916.3
Non-U.S.		1,530.6		—		—		—		1,530.6		—		1,530.6
Other		191.5		—		—		—		191.5		—		191.5
Total Commercial		14,253.2		24.1		13.8		10.4		14,301.5		52.1		14,353.6
Personal
Residential Real Estate		9,556.3		49.5		9.9		4.5		9,620.2		162.4		9,782.6
Private Client		7,396.0		56.0		5.9		7.8		7,465.7		1.2		7,466.9
Other		37.1		—		—		—		37.1		—		37.1
Total Personal		16,989.4		105.5		15.8		12.3		17,123.0		163.6		17,286.6
Total Loans and Leases	$	31,242.6	$	129.6	$	29.6	$	22.7	$	31,424.5	$	215.7	$	31,640.2
								Other Real Estate Owned				16.6
								Total Nonperforming Assets			$	232.3

Impaired Loans By Segment and Class

The following tables provide information related to impaired loans by segment and class.

Table 44: Information about Impaired Loans as of the Period End

	As of June 30, 2015						As of December 31, 2014
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Allowance		Recorded Investment		Unpaid Principal Balance		Specific Allowance
With No Related Specific Allowance
Commercial and Institutional	$	8.8	$	11.9	$	—	$	9.0	$	12.0	$	—
Commercial Real Estate		23.9		29.1		—		47.0		52.4		—
Lease Financing, net		—		—		—		4.2		4.2		—
Residential Real Estate		155.7		200.5		—		160.9		204.8		—
Private Client		0.8		0.8		—		0.2		0.5		—
With a Related Specific Allowance
Commercial and Institutional		11.5		7.1		4.9		6.5		6.6		2.9
Commercial Real Estate		5.6		6.6		1.5		12.2		18.3		2.9
Lease Financing, net		2.9		2.9		1.4		—		—		—
Residential Real Estate		9.0		9.2		2.6		1.4		1.4		0.4
Private Client		0.8		0.8		0.4		0.8		0.8		0.4
Total
Commercial		52.7		57.6		7.8		78.9		93.5		5.8
Personal		166.3		211.3		3.0		163.3		207.5		0.8
Total	$	219.0	$	268.9	$	10.8	$	242.2	$	301.0	$	6.6

	Three Months Ended June 30,								Six Months Ended June 30,
	2015				2014				2015				2014
(In Millions)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With No Related Specific Allowance
Commercial and Institutional	$	8.1	$	—	$	10.6	$	—	$	8.6	$	—	$	11.0	$	—
Commercial Real Estate		33.9		0.2		44.7		0.2		41.2		0.4		44.8		0.5
Lease Financing, net		—		—		4.3		—		3.4		0.1		4.4		0.1
Residential Real Estate		155.7		0.5		181.2		0.7		158.5		0.8		185.2		1.3
Private Client		0.6		—		0.7		—		0.4		—		0.7		—
With a Related Specific Allowance
Commercial and Institutional		12.2		—		9.7		—		10.3		—		9.9		—
Commercial Real Estate		10.2		—		22.7		—		11.2		—		24.6		—
Lease Financing, net		3.2		—		—		—		1.6		—		—		—
Residential Real Estate		6.8		—		3.8		—		4.8		—		5.4		—
Private Client		0.8		—		0.5		—		0.8		—		0.3		—
Total
Commercial		67.6		0.2		92.0		0.2		76.3		0.5		94.7		0.6
Personal		163.9		0.5		186.2		0.7		164.5		0.8		191.6		1.3
Total	$	231.5	$	0.7	$	278.2	$	0.9	$	240.8	$	1.3	$	286.3	$	1.9

Number of Loans and Leases Modified in TDRs and Total Recorded Investments and Unpaid Principal Balances

The following tables provide, by segment and class, the number of loans and leases modified in TDRs during the three- and six-month periods ended June 30, 2015 and 2014, and the recorded investments and unpaid principal balances as of June 30, 2015 and 2014.

Table 45: Troubled Debt Restructurings

($ In Millions)	Three Months Ended June 30, 2015						Six Months Ended June 30, 2015
	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	$	0.1	$	0.1		2	$	0.1	$	0.1
Commercial Real Estate		—		—		—		1		0.8		0.8
Total Commercial		1		0.1		0.1		3		0.9		0.9
Personal
Residential Real Estate		19		8.5		9.4		76		15.6		19.6
Private Client		1		0.6		0.6		1		0.6		0.6
Total Personal		20		9.1		10.0		77		16.2		20.2
Total Loans and Leases		21	$	9.2	$	10.1		80	$	17.1	$	21.1

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

($ In Millions)	Three Months Ended June 30, 2014						Six Months Ended June 30, 2014
	Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance		Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance
Commercial
Commercial and Institutional		2	$	0.7	$	1.0		2	$	0.7	$	1.0
Commercial Real Estate		—		—		—		1		0.7		0.7
Total Commercial		2		0.7		1.0		3		1.4		1.7
Personal
Residential Real Estate		34		4.9		5.7		68		8.4		9.4
Private Client		2		0.3		0.3		3		0.3		0.3
Total Personal		36		5.2		6.0		71		8.7		9.7
Total Loans and Leases		38	$	5.9	$	7.0		74	$	10.1	$	11.4

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

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Computations of Net Income Per Common Share (Parenthetical) (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Schedule of Earnings Per Share, Basic and Diluted, by Common Class [Line Items]
Common stock equivalents not included in the computation of diluted earnings per share because their inclusion would have been antidilutive	0	1,981,304	748,268	1,980,947

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Earnings Contribution of Northern Trust's Reporting Segments (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Fully taxable equivalent basis adjustments	$ 6.4	$ 6.8	$ 12.6	$ 15.5

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Gains and Losses Recorded in Consolidated Statements of Income Related to Client Related and Trading Derivative Financial Instruments (Detail) - Client Related and Trading - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ 77.8	$ 55.0	$ 154.3	$ 107.0
Foreign Exchange Contracts | Foreign Exchange Trading Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	74.8	52.9	146.4	103.0
Interest Rate Contracts | Security Commissions and Trading Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ 3.0	$ 2.1	$ 7.9	$ 4.0

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Credit Related Impairment Losses Recognized in Earnings on Other Than Temporarily Impaired Securities (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Changes in OTTI Losses	[1]				$ (4.6)
Noncredit-related Losses Recorded in / (Reclassified from) OCI	[2]				0.7
Net Impairment Losses Recognized in Earnings		$ 0.0	$ 0.0	$ 0.0	$ (3.9)

[1] For initial OTTI in the applicable period, the balance includes the excess of the amortized cost over the fair value of the impaired securities. For subsequent impairments of the same security, the balance includes any additional changes in fair value of the security subsequent to its most recently recorded OTTI.

[2] For initial OTTI in the applicable period, the balance includes the portion of the excess of amortized cost over the fair value of the impaired securities that was recorded in other comprehensive income (OCI). For subsequent impairments of the same security, the balance includes additional changes in OCI for that security subsequent to its most recently recorded OTTI.

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Accumulated Other Comprehensive Income (Loss) Changes During Period (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss)	$ (7.3)	$ 30.9	$ 46.0	$ 39.1
Net Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(36.0)	53.6	50.7	60.9
Tax Effect	13.6	(20.1)	(19.0)	(22.9)
Other Comprehensive Income (Loss)	(22.4)	33.5	31.7	38.0
Net Unrealized Gains (Losses) on Securities Available for Sale | Noncredit-Related Unrealized Losses on Securities OTTI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax		(3.3)		(1.8)
Tax Effect		1.3		0.7
Other Comprehensive Income (Loss)		(2.0)		(1.1)
Net Unrealized Gains (Losses) on Securities Available for Sale | Other Unrealized Gains (Losses) on Securities Available-for-Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(36.4)	57.3	50.4	63.0
Tax Effect	13.8	(21.4)	(18.9)	(23.6)
Other Comprehensive Income (Loss)	(22.6)	35.9	31.5	39.4
Net Unrealized Gains (Losses) on Securities Available for Sale | Reclassification Adjustment for (Gains) Losses Included in Net Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	0.4	(0.4)	0.3	(0.3)
Tax Effect	(0.2)		(0.1)
Other Comprehensive Income (Loss)	0.2	(0.4)	0.2	(0.3)
Net Unrealized Gains (Losses) on Cash Flow Hedges Designations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	6.1	(1.1)	2.4	1.5
Tax Effect	(2.9)	0.5	(0.3)	(0.5)
Other Comprehensive Income (Loss)	3.2	(0.6)	2.1	1.0
Net Unrealized Gains (Losses) on Cash Flow Hedges Designations | Reclassification Adjustment for (Gains) Losses Included in Net Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	1.3	0.2	2.3	0.4
Tax Effect	(0.5)	(0.1)	(0.9)	(0.2)
Other Comprehensive Income (Loss)	0.8	0.1	1.4	0.2
Net Unrealized Gains (Losses) on Cash Flow Hedges Designations | Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	4.8	(1.3)	0.1	1.1
Tax Effect	(2.4)	0.6	0.6	(0.3)
Other Comprehensive Income (Loss)	2.4	(0.7)	0.7	0.8
Net Foreign Currency Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(26.6)	(17.2)	(1.1)	(21.9)
Tax Effect	32.4	11.6	1.0	15.0
Other Comprehensive Income (Loss)	5.8	(5.6)	(0.1)	(6.9)
Net Foreign Currency Adjustments | Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	53.0	13.4	(37.1)	19.9
Tax Effect	2.4	(0.3)	14.6	(1.2)
Other Comprehensive Income (Loss)	55.4	13.1	(22.5)	18.7
Net Foreign Currency Adjustments | Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	1.5	(1.0)	0.5	(1.6)
Tax Effect	(0.5)	0.4	(0.2)	0.6
Other Comprehensive Income (Loss)	1.0	(0.6)	0.3	(1.0)
Net Foreign Currency Adjustments | Net Investment Hedge Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(81.1)	(29.6)	35.5	(40.2)
Tax Effect	30.5	11.5	(13.4)	15.6
Other Comprehensive Income (Loss)	(50.6)	(18.1)	22.1	(24.6)
Net Pension and Other Postretirement Benefit Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	9.7	6.1	19.2	12.5
Tax Effect	(3.6)	(2.5)	(6.9)	(5.5)
Other Comprehensive Income (Loss)	6.1	3.6	12.3	7.0
Net Pension and Other Postretirement Benefit Adjustments | Reclassification Adjustment for (Gains) Losses Included in Net Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	9.7	6.1	19.2	12.5
Tax Effect	(3.6)	(2.5)	(6.9)	(5.5)
Other Comprehensive Income (Loss)	$ 6.1	$ 3.6	$ 12.3	$ 7.0

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Contingent Liabilities - Additional Information (Detail) - USD ($) shares in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2013	Dec. 31, 2014
Commitments and Contingencies Disclosure [Line Items]
Commitments and Letters of Credit	$ 36,400,000,000		$ 35,100,000,000
Standby letters of credit outstanding	$ 4,200,000,000		4,500,000,000
Minimum securities lending related collateral percentage	100.00%
Possible loss in future periods in excess of accrual	$ 125,000,000
Legal Settlement Charge		$ 19,200,000
Remaining Visa shares held by Northern Trust, original cost basis	$ 0
Visa Class B
Commitments and Contingencies Disclosure [Line Items]
Number of common stock shares sold	1.0
Net pre-tax gain on redemption of Visa common stock	$ 99,900,000
Remaining Visa shares held by Northern Trust	5.2
Indemnification Agreement
Commitments and Contingencies Disclosure [Line Items]
Collateralized securities loaned, subject to indemnification	$ 105,500,000,000		98,100,000,000
Credit loss liability	$ 0		$ 0

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Components of Net Interest Income (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Net Interest Income [Line Items]
Cash and Due from Banks	$ 7,152.9	$ 3,050.6	$ 3,945.2	$ 3,162.4
Interest-Bearing Deposits with Banks	15,650.3	$ 14,928.3
Cash and Due from Banks of which interest income earned on for the three months ended June 30, 2015 | Bank Time Deposits
Net Interest Income [Line Items]
Cash and Due from Banks	1,100.0
Cash and Due from Banks of which interest income earned on for the six months ended June 30, 2015 | Bank Time Deposits
Net Interest Income [Line Items]
Cash and Due from Banks	$ 3,300.0

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Derivative Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Derivative [Line Items]
Derivative assets recorded on the consolidated balance sheet, reduced as a result of master netting agreements	$ 1,300,000,000		$ 1,300,000,000		$ 1,900,000,000
Derivative liabilities recorded on the consolidated balance sheet, reduced as a result of master netting agreements	1,300,000,000		1,300,000,000		1,900,000,000
Reduction in derivative assets due to cash collateral received from derivative counterparties	387,900,000		387,900,000		315,800,000
Reduction in derivative liabilities due to cash collateral deposited with derivative counterparties	151,700,000		151,700,000		1,200,000,000
This amount represents additional cash collateral received from derivative counterparties not offset against derivative assets	127,200,000		127,200,000		19,600,000
This amount represents additional cash collateral deposited with derivative counterparties not offset against derivative liabilities	41,500,000		41,500,000		153,200,000
Securities posted as collateral	17,200,000		17,200,000		27,400,000
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position	57,500,000		57,500,000		299,500,000
Collateral deposited with derivative counterparties for derivatives instruments with credit-risk-related contingent features that are in a liability position	22,400,000		22,400,000		272,900,000
Termination payments that could have been required for derivative instruments with credit-risk-related contingent features	35,100,000		35,100,000		26,600,000
Ineffectiveness or changes in the fair value of hedged items recognized in earnings for fair value hedges	0	$ 0	0	$ 0
Ineffectiveness recognized in earnings for cash flow hedges	$ 0	0	0	0
Maximum length of time hedged cash flow hedges	23 months
Ineffectiveness from net investment hedges	$ 0	0	0	0
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	(6,400,000)	(6,400,000)	(6,400,000)	(6,400,000)
Available for Sale Investment Securities
Derivative [Line Items]
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges	$ 3,800,000	$ 3,800,000	$ 3,800,000	$ 3,800,000
Net Investment Hedges
Derivative [Line Items]
Sterling denominated debt designated as hedges of foreign exchange risk					$ 243,900,000
Client Related and Trading
Derivative [Line Items]
Percentage of derivatives outstanding related to client-related and trading activities	97.00%		97.00%		97.00%

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Reclassification Adjustments out of Accumulated Other Comprehensive Income (Loss) (Detail) - Jun. 30, 2015 - USD ($) $ in Millions	Total	Total
Available for Sale Investment Securities | Realized (Gains) Losses on Securities Available for Sale | Investment Security Gains (Losses), net
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gross Reclassification Adjustment	$ 0.4	$ 0.3
CASH FLOW HEDGES | Foreign Exchange Contracts | Other Operating Income/Expense
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gross Reclassification Adjustment	1.3	2.3
Pension and Other Postretirement Benefit Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gross Reclassification Adjustment	9.7	19.2
Pension and Other Postretirement Benefit Adjustments | Employee Benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Net Actuarial (Gains) Losses	$ 9.7	19.3
Amortization of Prior Service Cost		$ (0.1)

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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Line Items]
Estimated future amortization expense for 2015	$ 4.2		$ 4.2
Estimated future amortization expense for 2016	8.5		8.5
Estimated future amortization expense for 2017	8.4		8.4
Estimated future amortization expense for 2018	7.8		7.8
Estimated future amortization expense for 2019	7.6		7.6
Other Intangible Assets
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense related to other intangible assets	$ 2.1	$ 5.0	$ 6.7	$ 9.9

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Share-Based Compensation Plans

6 Months Ended

Jun. 30, 2015

Share-Based Compensation Plans

17. Share-Based Compensation Plans — The Northern Trust Corporation 2012 Stock Plan provides for the grant of nonqualified stock options, incentive stock options, stock appreciation rights, stock awards, restricted stock units and performance stock units.

Total compensation expense for share-based payment arrangements and the associated tax impacts were as follows for the three and six months ended June 30, 2015 and 2014.

Table 57: Total Compensation Expense for Share-Based Payment Arrangements

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Restricted Stock Unit Awards	$	13.4	$	14.9	$	26.9	$	29.0
Stock Options		1.7		2.1		7.7		8.5
Performance Stock Units		4.1		3.2		7.5		5.8
Total Share-Based Compensation Expense		19.2		20.2		42.1		43.3
Tax Benefits Recognized	$	7.2	$	7.5	$	15.8	$	16.2

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Valuation Techniques, Significant Unobservable Inputs, Quantitative Information Non-recurring Basis (Detail) - Jun. 30, 2015 - Fair Value, Measurements, Nonrecurring - Fair Value, Inputs, Level 3 - USD ($) $ in Millions	Total
Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instrument, fair value assets	$ 20.9
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instrument, fair value assets	$ 0.3
Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Market Approach
Unobservable Input	Discount to reflect realizable value
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Market Approach
Unobservable Input	Discount to reflect realizable value
Lower Limit | Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range of Discounts Applied	15.00%
Lower Limit | Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range of Discounts Applied	15.00%
Upper Limit | Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range of Discounts Applied	25.00%
Upper Limit | Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range of Discounts Applied	20.00%

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Derivative Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2015

Notional and Fair Value Amounts of Client-related and Trading Derivative Financial Instruments

The following table shows the notional and fair values of client-related and trading derivative financial instruments. 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, which is significantly less than the notional amount.

Table 58: Notional and Fair Values of Client-Related and Trading Derivative Financial Instruments

	June 30, 2015						December 31, 2014
	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	264,964.1	$	2,451.3	$	2,416.7	$	257,568.7	$	4,149.5	$	4,072.0
Interest Rate Contracts		5,576.0		96.5		93.1		5,353.8		105.5		101.3
Total	$	270,540.1	$	2,547.8	$	2,509.8	$	262,922.5	$	4,255.0	$	4,173.3

Location and Amount of Gains and Losses Recorded in Consolidated Statements of Income

The following table shows the location and amount of gains and losses recorded in the consolidated statements of income for the three and six months ended June 30, 2015, and 2014.

Table 59: Location and Amount of Gains and Losses Recorded in Income

		Amount of Derivative Gain/(Loss) Recognized in Income
	Location of Derivative Gain/(Loss) Recognized in Income	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)		2015		2014		2015		2014
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	74.8	$	52.9	$	146.4	$	103.0
Interest Rate Contracts	Security Commissions and Trading Income		3.0		2.1		7.9		4.0
Total		$	77.8	$	55.0	$	154.3	$	107.0

Types and Classifications of Derivative Instruments

The following table identifies the types and classifications of derivative instruments formally designated as hedges under GAAP and used by Northern Trust to manage risk, their notional and fair values, and the respective risks addressed.

Table 60: Notional and Fair Values of Designated Risk Management Derivative Financial Instruments

			June 30, 2015						December 31, 2014
	Derivative Instrument	Risk Classification	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)					Asset		Liability				Asset		Liability
Fair Value Hedges
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate	$	2,720.4	$	11.7	$	25.3	$	2,859.5	$	12.7	$	28.5
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Rate		1,250.0		93.2		2.1		1,250.0		112.8		2.0
Cash Flow Hedges
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		413.4		6.9		14.8		344.9		6.0		14.8
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate		10.0		—		—		10.0		—		—
Available for Sale Investment Securities	Interest Rate Option Contracts	Interest Rate		725.0		2.8		—		625.0		1.3		—
Net Investment Hedges
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		1,870.1		22.9		43.2		1,795.4		118.9		3.4
Total			$	6,988.9	$	137.5	$	85.4	$	6,884.8	$	251.7	$	48.7

Gains/Losses of Derivative Financial Instruments

The following table shows the location and amount of derivative gains and losses recorded in the consolidated statements of income related to fair value hedges for the three and six months ended June 30, 2015 and 2014.

Table 61: Location and Amount of Derivative Gains and Losses Recorded in Income

		Location of Derivative Gain/(Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
	Derivative Instrument		Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)			2015			2014			2015			2014
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Income	$	5.0		$	(14.9	)	$	(12.3	)	$	(27.0	)
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Expense		(27.7	)		27.7			2.1			60.2
Total			$	(22.7	)	$	12.8		$	(10.2	)	$	33.2

Cash Flow Hedge Derivative Gains and Losses Recognized in AOCI and the Amounts Reclassified to Earnings

The following tables provide cash flow hedge derivative gains and losses recognized in AOCI and the amounts reclassified to earnings during the three and six months ended June 30, 2015 and 2014.

Table 62: Cash Flow Hedge Derivative Gains and Losses Recognized in AOCI and Reclassified to Earnings

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Option Contracts (Before Tax)
Three Months Ended June 30,	2015			2014			2015			2014
Net Gain/(Loss) Recognized in AOCI	$	6.5		$	(1.3	)	$	(1.7	)	$	—
Net Gain/(Loss) Reclassified from AOCI to Net Income
Other Operating Income		(2.3	)		1.9			—			—
Interest Income		—			—			1.2			—
Other Operating Expense		(0.3	)		—			—			—
Total	$	(2.6	)	$	1.9		$	1.2		$	—

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Option Contracts (Before Tax)
Six Months Ended June 30,	2015			2014			2015		2014
Net Gain/(Loss) Recognized in AOCI	$	(1.4	)	$	1.1		$	1.5	$	—
Net Gain/(Loss) Reclassified from AOCI to Net Income
Other Operating Income		(3.9	)		2.7			—		—
Interest Income		—			—			2.4		—
Other Operating Expense		(0.8	)		(0.2	)		—		—
Total	$	(4.7	)	$	2.5		$	2.4	$	—

Net Investment Hedge Gains and Losses Recognized in AOCI

The following table provides net investment hedge gains and losses recognized in AOCI during the three and six months ended June 30, 2015 and 2014.

Table 63: Net Investment Hedge Gains and Losses Recognized in AOCI

	Hedging Gain/(Loss) Recognized in OCI (Before Tax)
	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2015			2014			2015		2014
Foreign Exchange Contracts	$	(81.1	)	$	(22.9	)	$	30.5	$	(31.9	)
Sterling Denominated Subordinated Debt		—			(6.7	)		5.0		(8.3	)
Total	$	(81.1	)	$	(29.6	)	$	35.5	$	(40.2	)

Types of Risk Management Derivative Instruments Not Formally Designated as Hedges, Including Notional Amounts and Fair Values

The following table identifies the types of risk management derivative instruments not formally designated as hedges and their notional amounts and fair values.

Table 64: Notional and Fair Values of Non-Designated Risk Management Derivative Instruments

(In Millions)	June 30, 2015						December 31, 2014
	Notional Value		Fair Value				Notional Value		Fair Value
			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	205.6	$	1.0	$	0.7	$	246.3	$	0.8	$	5.3
Other Financial Derivatives (1)		110.7		—		11.3		—		—		—
Total	$	316.3	$	1.0	$	12.0	$	246.3	$	0.8	$	5.3

(1) This line includes a swap related to the sale of certain Visa Class B common shares.

Gains/Losses of Derivative Financial Instruments

The following table provides the location and amount of gains and losses recorded in the consolidated statements of income for the three and six months ended June 30, 2015 and 2014.

Table 65: Location and Amount of Gains and Losses Recorded in Income for Non-Designated Risk Management Derivative Instruments

(In Millions)	Location of Derivative Gain/ (Loss) Recognized in Income		Amount of Derivative Gain/(Loss) Recognized in Income
			Three Months Ended June 30,					Six Months Ended June 30,
			2015			2014		2015			2014
Foreign Exchange Contracts		Other Operating Income		6.6			1.5		(2.1	)		0.8
Other Financial Derivatives (1)		Other Operating Income		(11.3	)		—		(11.3	)		—
Total			$	(4.7	)	$	1.5	$	(13.4	)	$	0.8

(1) This line includes a swap related to the sale of certain Visa Class B common shares.

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Components of Accumulated Other Comprehensive Income (Loss) (AOCI) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending Balance	$ (273.7)	$ (205.2)	$ (273.7)	$ (205.2)
Net Change	(7.3)	30.9	46.0	39.1
Beginning Balance			(319.7)	(244.3)
Net Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending Balance	59.3	44.0	59.3	44.0
Net Change			31.7	38.0
Beginning Balance			27.6	6.0
Net Unrealized Gains (Losses) on Cash Flow Hedges Designations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending Balance	(2.6)	3.9	(2.6)	3.9
Net Change			2.1	1.0
Beginning Balance			(4.7)	2.9
Net Foreign Currency Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending Balance	(1.8)	0.2	(1.8)	0.2
Net Change			(0.1)	(6.9)
Beginning Balance			(1.7)	7.1
Net Pension and Other Postretirement Benefit Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Ending Balance	$ (328.6)	$ (253.3)	(328.6)	(253.3)
Net Change			12.3	7.0
Beginning Balance			$ (340.9)	$ (260.3)

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Offsetting of Derivative Assets and of Securities Purchased Under Agreements to Resell Within Consolidated Balance Sheets (Parenthetical) (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Other Assets (excluding Derivative Assets)	$ 3,113,600,000	$ 3,614,700,000
Federal Funds Sold	20,000,000	62,700,000
Cash collateral possessed that was not offset	$ 0	$ 0

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Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2015

Components of Accumulated Other Comprehensive Income (Loss) (AOCI)

The following tables summarize the components of accumulated other comprehensive income (loss) (AOCI) at June 30, 2015 and 2014, and changes during the three- and six-month periods then ended.

Table 51: Summary of Changes in Accumulated Other Comprehensive Income (Loss)

(In Millions)	Balance at June 30, 2015			Net Change			Balance at December 31, 2014
Net Unrealized Gains (Losses) on Securities Available for Sale	$	59.3		$	31.7		$	27.6
Net Unrealized Gains (Losses) on Cash Flow Hedges		(2.6	)		2.1			(4.7	)
Net Foreign Currency Adjustments		(1.8	)		(0.1	)		(1.7	)
Net Pension and Other Postretirement Benefit Adjustments		(328.6	)		12.3			(340.9	)
Total	$	(273.7	)	$	46.0		$	(319.7	)

(In Millions)	Balance at June 30, 2014			Net Change			Balance at December 31, 2013
Net Unrealized Gains (Losses) on Securities Available for Sale	$	44.0		$	38.0		$	6.0
Net Unrealized Gains (Losses) on Cash Flow Hedges		3.9			1.0			2.9
Net Foreign Currency Adjustments		0.2			(6.9	)		7.1
Net Pension and Other Postretirement Benefit Adjustments		(253.3	)		7.0			(260.3	)
Total	$	(205.2	)	$	39.1		$	(244.3	)

Components of Changes in Accumulated Other Comprehensive Income (Loss)

Table 52: Details of Changes in Accumulated Other Comprehensive Income (Loss)

	Three Months Ended June 30,
	2015									2014
(In Millions)	Before Tax			Tax Effect			After Tax			Before Tax			Tax Effect			After Tax
Unrealized Gains (Losses) on Securities Available for Sale
Noncredit-Related Unrealized Losses on Securities OTTI	$	—		$	—		$	—		$	(3.3	)	$	1.3		$	(2.0	)
Other Unrealized Gains (Losses) on Securities Available for Sale		(36.4	)		13.8			(22.6	)		57.3			(21.4	)		35.9
Reclassification Adjustment for (Gains) Losses Included in Net Income		0.4			(0.2	)		0.2			(0.4	)		—			(0.4	)
Net Change		(36.0	)		13.6			(22.4	)		53.6			(20.1	)		33.5
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		4.8			(2.4	)		2.4			(1.3	)		0.6			(0.7	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		1.3			(0.5	)		0.8			0.2			(0.1	)		0.1
Net Change		6.1			(2.9	)		3.2			(1.1	)		0.5			(0.6	)
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		53.0			2.4			55.4			13.4			(0.3	)		13.1
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)		1.5			(0.5	)		1.0			(1.0	)		0.4			(0.6	)
Net Investment Hedge Gains (Losses)		(81.1	)		30.5			(50.6	)		(29.6	)		11.5			(18.1	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		(26.6	)		32.4			5.8			(17.2	)		11.6			(5.6	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		9.7			(3.6	)		6.1			6.1			(2.5	)		3.6
Net Change	$	9.7		$	(3.6	)	$	6.1		$	6.1		$	(2.5	)	$	3.6

	Six Months Ended June 30,
	2015									2014
(In Millions)	Before Tax			Tax Effect			After Tax			Before Tax			Tax Effect			After Tax
Unrealized Gains (Losses) on Securities Available for Sale
Noncredit-Related Unrealized Losses on Securities OTTI	$	—		$	—		$	—		$	(1.8	)	$	0.7		$	(1.1	)
Other Unrealized Gains (Losses) on Securities Available for Sale		50.4			(18.9	)		31.5			63.0			(23.6	)		39.4
Reclassification Adjustment for (Gains) Losses Included in Net Income		0.3			(0.1	)		0.2			(0.3	)		—			(0.3	)
Net Change		50.7			(19.0	)		31.7			60.9			(22.9	)		38.0
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		0.1			0.6			0.7			1.1			(0.3	)		0.8
Reclassification Adjustment for (Gains) Losses Included in Net Income		2.3			(0.9	)		1.4			0.4			(0.2	)		0.2
Net Change		2.4			(0.3	)		2.1			1.5			(0.5	)		1.0
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		(37.1	)		14.6			(22.5	)		19.9			(1.2	)		18.7
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)		0.5			(0.2	)		0.3			(1.6	)		0.6			(1.0	)
Net Investment Hedge Gains (Losses)		35.5			(13.4	)		22.1			(40.2	)		15.6			(24.6	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		(1.1	)		1.0			(0.1	)		(21.9	)		15.0			(6.9	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		19.2			(6.9	)		12.3			12.5			(5.5	)		7.0
Net Change	$	19.2		$	(6.9	)	$	12.3		$	12.5		$	(5.5	)	$	7.0

Reclassification Out of Accumulated Other Comprehensive Income (Loss)

Table 53: Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)

(In Millions)	Location of Reclassification Adjustments Recognized in Income	Amount of Reclassification Adjustments Recognized in Income
		Three Months Ended		Six Months Ended
		June 30, 2015
Securities Available for Sale
Realized (Gains) Losses on Securities Available for Sale	Investment Security Gains (Losses), net	$	0.4	$	0.3
Realized (Gains) Losses on Cash Flow Hedges
Foreign Exchange Contracts	Other Operating Income/Expense		1.3		2.3
Pension and Other Postretirement Benefit Adjustments
Amortization of Net Actuarial (Gain) Loss	Employee Benefits		9.7		19.3
Amortization of Prior Service Cost	Employee Benefits		—		(0.1	)
Gross Reclassification Adjustment		$	9.7	$	19.2

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Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Amortized Cost	$ 31,740.5	$ 29,514.1
Gross Unrealized Gains	132.3	110.9
Gross Unrealized Losses	37.2	66.5
Fair Value	31,835.6	29,558.5
U.S. Government
Investment Holdings [Line Items]
Amortized Cost	4,993.5	4,493.5
Gross Unrealized Gains	25.3	15.1
Gross Unrealized Losses		1.7
Fair Value	5,018.8	4,506.9
Obligations of States and Political Subdivisions
Investment Holdings [Line Items]
Amortized Cost	4.5	4.5
Gross Unrealized Gains		0.1
Fair Value	4.5	4.6
U.S. Government Sponsored Agency
Investment Holdings [Line Items]
Amortized Cost	16,690.1	16,326.4
Gross Unrealized Gains	91.4	82.3
Gross Unrealized Losses	16.1	19.5
Fair Value	16,765.4	16,389.2
Non-U.S. Government
Investment Holdings [Line Items]
Amortized Cost	310.3	309.5
Gross Unrealized Gains	0.7	0.9
Fair Value	311.0	310.4
Corporate Debt
Investment Holdings [Line Items]
Amortized Cost	3,749.1	3,617.5
Gross Unrealized Gains	4.8	1.8
Gross Unrealized Losses	19.1	41.6
Fair Value	3,734.8	3,577.7
Covered Bonds
Investment Holdings [Line Items]
Amortized Cost	1,975.5	1,899.9
Gross Unrealized Gains	6.9	7.9
Gross Unrealized Losses	0.2	0.3
Fair Value	1,982.2	1,907.5
Sub-Sovereign, Supranational and Non US Agency Bonds
Investment Holdings [Line Items]
Amortized Cost	560.0
Gross Unrealized Gains	1.2
Gross Unrealized Losses	0.5
Fair Value	560.7
Supranational and Non-U.S. Agency Bonds
Investment Holdings [Line Items]
Amortized Cost		360.0
Gross Unrealized Gains		1.5
Gross Unrealized Losses		0.9
Fair Value		360.6
Residential Mortgage-Backed
Investment Holdings [Line Items]
Amortized Cost		6.9
Gross Unrealized Losses		0.5
Fair Value		6.4
Other Asset-Backed
Investment Holdings [Line Items]
Amortized Cost	3,118.5	2,321.8
Gross Unrealized Gains	1.2	0.5
Gross Unrealized Losses	0.5	1.0
Fair Value	3,119.2	2,321.3
Auction Rate Securities
Investment Holdings [Line Items]
Amortized Cost	16.7	18.4
Gross Unrealized Gains	0.5	0.5
Gross Unrealized Losses	0.6	0.8
Fair Value	16.6	18.1
Commercial Mortgage-Backed
Investment Holdings [Line Items]
Amortized Cost	198.8
Gross Unrealized Gains	0.1
Gross Unrealized Losses	0.2
Fair Value	198.7
Others
Investment Holdings [Line Items]
Amortized Cost	123.5	155.7
Gross Unrealized Gains	0.2	0.3
Gross Unrealized Losses		0.2
Fair Value	$ 123.7	$ 155.8

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Allowances for Credit Losses and Recorded Investments in Loans and Leases by Segment (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Specifically Evaluated for Impairment	$ 219.0		$ 242.2
Evaluated for Inherent Impairment	32,734.8		31,398.0
Total Loans and Leases	32,953.8		31,640.2
Specifically Evaluated for Impairment	10.8		6.6
Evaluated for Inherent Impairment	246.5		260.4
Allowance Assigned to Loans and Leases	257.3		267.0
Allowance for Unfunded Exposures Commitments and Standby Letters of Credit	16.9		28.9
Total Allowance for Credit Losses	274.2	$ 286.7	295.9	$ 303.5	$ 309.4	$ 307.9
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Specifically Evaluated for Impairment	52.7		78.9
Evaluated for Inherent Impairment	15,252.2		14,274.7
Total Loans and Leases	15,304.9		14,353.6
Specifically Evaluated for Impairment	7.8		5.8
Evaluated for Inherent Impairment	131.2		138.0
Allowance Assigned to Loans and Leases	139.0		143.8
Allowance for Unfunded Exposures Commitments and Standby Letters of Credit	13.7		25.9
Total Allowance for Credit Losses	152.7	164.3	169.7	168.7	173.1	168.0
Personal
Financing Receivable, Allowance for Credit Losses [Line Items]
Specifically Evaluated for Impairment	166.3		163.3
Evaluated for Inherent Impairment	17,482.6		17,123.3
Total Loans and Leases	17,648.9		17,286.6
Specifically Evaluated for Impairment	3.0		0.8
Evaluated for Inherent Impairment	115.3		122.4
Allowance Assigned to Loans and Leases	118.3		123.2
Allowance for Unfunded Exposures Commitments and Standby Letters of Credit	3.2		3.0
Total Allowance for Credit Losses	$ 121.5	$ 122.4	$ 126.2	$ 134.8	$ 136.3	$ 139.9

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Loans and Leases - Additional Information (Detail)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2015 Loan	Mar. 31, 2014 Loan	Dec. 31, 2014 USD ($)
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%
Draw period for credit line products			10 years
Other U.S. loans and non-U.S. loans, short duration advances	$ 1,400,000,000		$ 1,400,000,000				$ 1,500,000,000
Demand deposits	46,700,000		46,700,000				92,100,000
Loans held for sale	3,900,000		3,900,000				2,500,000
Interest income that would have been recorded for nonperforming loans	2,000,000	$ 2,400,000	4,100,000	$ 4,900,000
Undrawn loan commitments and standby letters of credit	2,600,000		2,600,000				2,400,000
Total Loans and Leases	32,953,800,000		32,953,800,000				31,640,200,000
Unpaid principal balance	268,900,000		268,900,000				$ 301,000,000
Foreclosed residential real estate properties with carrying value	8,400,000		8,400,000
Consumer loans with carrying value collateralized by residential real estate property	24,400,000		$ 24,400,000
Interest Income
Accounts, Notes, Loans and Financing Receivable [Line Items]
Leveraged leases residual value impairment	17,800,000
Lower Limit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Days contractually past due for interest and principal and the loan is not well-secured and in the process of collection			90 days
Upper Limit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due for disclosure purposes to be categorized as a current			29 days
Limit of individual homogeneous loans collective evaluation for impairment and excluded from impaired loan disclosures	$ 250,000		$ 250,000
First Lien
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held by Northern trust	89.00%		89.00%				89.00%
Equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Equity credit lines	$ 1,700,000,000		$ 1,700,000,000				$ 1,800,000,000
Nonperforming Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	82,200,000		82,200,000				82,700,000
Performing Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	46,900,000		$ 46,900,000				$ 68,600,000
Performing Financing Receivable | Lower Limit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period for which troubled debt restructurings with modified terms is performing before ceasing to be classified as impaired loan			6 months
Troubled debt restructuring loans and leases receivable to Performing status			6 months
Residential Real Estate | Re-Defaulted
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans and Leases | Loan					4	3
Recorded Investment	600,000	500,000	$ 600,000	500,000
Unpaid principal balance	$ 700,000	$ 900,000	$ 700,000	$ 900,000
Private Client | Re-Defaulted
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans and Leases | Loan						1

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Assets and Liabilities Measured at Fair Value on Recurring Basis Segregated by Fair Value Hierarchy Level (Parenthetical) (Detail) - Subject to master netting arrangement or similar arrangement - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Derivative Financial Instruments, Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Reduction in derivatives due to cash collateral received from and deposited with derivative counterparties	$ 151.7	$ 1,200.0
Derivative Financial Instruments, Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Reduction in derivatives due to cash collateral received from and deposited with derivative counterparties	$ 387.9	$ 315.8

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Basis of Presentation

6 Months Ended

Jun. 30, 2015

Basis of Presentation

1. Basis of Presentation — The consolidated financial statements include the accounts of Northern Trust Corporation (Corporation) and its subsidiaries (collectively, Northern Trust). Significant intercompany balances and transactions have been eliminated. The consolidated financial statements, as of and for the periods ended June 30, 2015 and 2014, 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 with U.S. generally accepted accounting principles (GAAP) and reporting practices prescribed by the banking industry. For a description of Northern Trust’s significant accounting policies, refer to Note 1 of the Notes to Consolidated Financial Statements in the Annual Report on Form 10-K for the year ended December 31, 2014.

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Loan and Lease Segment and Class Balances Segregated by Borrower Ratings into "One to Three", "Four to Five" and "Six to Nine" (Watch List) Categories (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	$ 32,953.8	$ 31,640.2
1 to 3 Category
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	16,899.0	16,322.9
4 to 5 Category
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	15,484.4	14,680.4
6 to 9 Category (Watch List)
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	570.4	636.9
Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	8,999.1	8,381.9
Commercial Real Estate	3,651.4	3,333.3
Lease Financing, net	832.9	916.3
Non-U.S.	1,533.1	1,530.6
Other	288.4	191.5
Total Loans and Leases	15,304.9	14,353.6
Commercial | 1 to 3 Category
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	5,820.5	5,340.9
Commercial Real Estate	1,596.8	1,371.7
Lease Financing, net	477.6	552.5
Non-U.S.	770.2	636.8
Other	186.4	108.1
Total Loans and Leases	8,851.5	8,010.0
Commercial | 4 to 5 Category
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	3,071.1	2,947.3
Commercial Real Estate	1,988.7	1,861.8
Lease Financing, net	352.4	360.3
Non-U.S.	762.7	892.9
Other	102.0	83.4
Total Loans and Leases	6,276.9	6,145.7
Commercial | 6 to 9 Category (Watch List)
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	107.5	93.7
Commercial Real Estate	65.9	99.8
Lease Financing, net	2.9	3.5
Non-U.S.	0.2	0.9
Total Loans and Leases	176.5	197.9
Personal
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	9,369.0	9,782.6
Private Client	8,224.0	7,466.9
Other	55.9	37.1
Total Loans and Leases	17,648.9	17,286.6
Personal | 1 to 3 Category
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	2,794.7	3,148.0
Private Client	5,216.7	5,143.8
Other	36.1	21.1
Total Loans and Leases	8,047.5	8,312.9
Personal | 4 to 5 Category
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	6,195.2	6,207.0
Private Client	2,992.5	2,311.7
Other	19.8	16.0
Total Loans and Leases	9,207.5	8,534.7
Personal | 6 to 9 Category (Watch List)
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	379.1	427.6
Private Client	14.8	11.4
Total Loans and Leases	$ 393.9	$ 439.0

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Offsetting of Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2015

Securities Purchased Under Agreements to Resell and Derivative Assets in the Consolidated Balance Sheets

The following tables provide information regarding the offsetting of derivative assets and securities purchased under agreements to resell within the consolidated balance sheets as of June 30, 2015, and December 31, 2014.

Table 66: Offsetting of Derivative Assets and Securities Purchased Under Agreements to Resell

June 30, 2015
(In Millions)	Gross Recognized Assets		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (3)
Derivative Assets (1)
Foreign Exchange Contracts Over the Counter (OTC)	$	2,093.4	$	1,232.9	$	860.5	$	—	$	860.5
Interest Rate Swaps OTC		167.8		30.3		137.5		—		137.5
Interest Rate Swaps Exchange Cleared		36.4		19.2		17.2		—		17.2
Other Financial Derivatives		—		—		—		—		—
Cross Product Netting Adjustment		—		27.7		—		—		—
Cross Product Collateral Adjustment		—		387.9		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		2,297.6		1,698.0		599.6		—		599.6
Total Derivatives Not Subject to a Master Netting Arrangement		388.7		—		388.7		—		388.7
Total Derivatives		2,686.3		1,698.0		988.3		—		988.3
Securities Purchased under Agreements to Resell (2)	$	1,000.0	$	—	$	1,000.0	$	1,000.0	$	—

December 31, 2014
(In Millions)	Gross Recognized Assets		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (3)
Derivative Assets (1)
Foreign Exchange Contracts OTC	$	3,442.8	$	1,889.8	$	1,553.0	$	—	$	1,553.0
Interest Rate Swaps OTC		183.9		32.1		151.8		—		151.8
Interest Rate Swaps Exchange Cleared		48.4		13.1		35.3		—		35.3
Cross Product Netting Adjustment		—		6.3		—		—		—
Cross Product Collateral Adjustment		—		315.8		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,675.1		2,257.1		1,418.0		—		1,418.0
Total Derivatives Not Subject to a Master Netting Arrangement		832.4		—		832.4		—		832.4
Total Derivatives		4,507.5		2,257.1		2,250.4		—		2,250.4
Securities Purchased under Agreements to Resell (2)	$	1,000.0	$	—	$	1,000.0	$	1,000.0	$	—

(1) Derivative assets are reported in other assets in the consolidated balance sheets. Other assets (excluding derivative assets) totaled $3,113.6 million and $3,614.7 million as of June 30, 2015, and December 31, 2014, respectively.

(2) Securities purchased under agreements to resell are reported in federal funds sold and securities purchased under agreements to resell in the consolidated balance sheets. Federal funds sold totaled $20.0 million and $62.7 million as of June 30, 2015, and December 31, 2014, respectively.

(3) 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 June 30, 2015, and December 31, 2014.

Securities Sold Under Agreements to Repurchase and Derivative Liabilities in the Consolidated Balance Sheets

The following tables provide information regarding the offsetting of derivative liabilities and securities sold under agreements to repurchase within the consolidated balance sheets as of June 30, 2015, and December 31, 2014.

Table 67: Offsetting of Derivative Liabilities and Securities Sold Under Agreements to Repurchase

June 30, 2015
(In Millions)	Gross Recognized Liabilities		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (2)
Derivative Liabilities (1)
Foreign Exchange Contracts OTC	$	1,570.5	$	1,232.9	$	337.6	$	—	$	337.6
Interest Rate Swaps OTC		101.3		30.3		71.0		—		71.0
Interest Rate Swaps Exchange Cleared		19.2		19.2		—		—		—
Other Financial Derivatives		11.3		—		11.3		—		11.3
Cross Product Netting Adjustment		—		27.7		—		—		—
Cross Product Collateral Adjustment		—		151.7		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		1,702.3		1,461.8		240.5		—		240.5
Total Derivatives Not Subject to a Master Netting Arrangement		904.9		—		904.9		—		904.9
Total Derivatives		2,607.2		1,461.8		1,145.4		—		1,145.4
Securities Sold under Agreements to Repurchase	$	29.8	$	—	$	29.8	$	29.8	$	—

December 31, 2014
(In Millions)	Gross Recognized Liabilities		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (2)
Derivative Liabilities (1)
Foreign Exchange Contracts OTC	$	3,431.0	$	1,889.8	$	1,541.2	$	—	$	1,541.2
Interest Rate Swaps OTC		118.7		32.1		86.6		—		86.6
Interest Rate Swaps Exchange Cleared		13.1		13.1		—		—		—
Cross Product Netting Adjustment		—		6.3		—		—		—
Cross Product Collateral Adjustment		—		1,232.0		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,562.8		3,173.3		389.5		—		389.5
Total Derivatives Not Subject to a Master Netting Arrangement		664.5		—		664.5		—		664.5
Total Derivatives		4,227.3		3,173.3		1,054.0		—		1,054.0
Securities Sold under Agreements to Repurchase	$	885.1	$	—	$	885.1	$	885.1	$	—

(1) Derivative liabilities are reported in other liabilities in the consolidated balance sheets. Other liabilities (excluding derivative liabilities) totaled $2,519.5 million and $2,794.1 million as of June 30, 2015, and December 31, 2014, respectively.

(2) 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 June 30, 2015, and December 31, 2014.

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Offsetting of Assets and Liabilities

6 Months Ended

Jun. 30, 2015

Offsetting of Assets and Liabilities

21. Offsetting of Assets and Liabilities

The following tables provide information regarding the offsetting of derivative assets and securities purchased under agreements to resell within the consolidated balance sheets as of June 30, 2015, and December 31, 2014.

Table 66: Offsetting of Derivative Assets and Securities Purchased Under Agreements to Resell

June 30, 2015
(In Millions)	Gross Recognized Assets		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (3)
Derivative Assets (1)
Foreign Exchange Contracts Over the Counter (OTC)	$	2,093.4	$	1,232.9	$	860.5	$	—	$	860.5
Interest Rate Swaps OTC		167.8		30.3		137.5		—		137.5
Interest Rate Swaps Exchange Cleared		36.4		19.2		17.2		—		17.2
Other Financial Derivatives		—		—		—		—		—
Cross Product Netting Adjustment		—		27.7		—		—		—
Cross Product Collateral Adjustment		—		387.9		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		2,297.6		1,698.0		599.6		—		599.6
Total Derivatives Not Subject to a Master Netting Arrangement		388.7		—		388.7		—		388.7
Total Derivatives		2,686.3		1,698.0		988.3		—		988.3
Securities Purchased under Agreements to Resell (2)	$	1,000.0	$	—	$	1,000.0	$	1,000.0	$	—

December 31, 2014
(In Millions)	Gross Recognized Assets		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (3)
Derivative Assets (1)
Foreign Exchange Contracts OTC	$	3,442.8	$	1,889.8	$	1,553.0	$	—	$	1,553.0
Interest Rate Swaps OTC		183.9		32.1		151.8		—		151.8
Interest Rate Swaps Exchange Cleared		48.4		13.1		35.3		—		35.3
Cross Product Netting Adjustment		—		6.3		—		—		—
Cross Product Collateral Adjustment		—		315.8		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,675.1		2,257.1		1,418.0		—		1,418.0
Total Derivatives Not Subject to a Master Netting Arrangement		832.4		—		832.4		—		832.4
Total Derivatives		4,507.5		2,257.1		2,250.4		—		2,250.4
Securities Purchased under Agreements to Resell (2)	$	1,000.0	$	—	$	1,000.0	$	1,000.0	$	—

(1) Derivative assets are reported in other assets in the consolidated balance sheets. Other assets (excluding derivative assets) totaled $3,113.6 million and $3,614.7 million as of June 30, 2015, and December 31, 2014, respectively.

(2) Securities purchased under agreements to resell are reported in federal funds sold and securities purchased under agreements to resell in the consolidated balance sheets. Federal funds sold totaled $20.0 million and $62.7 million as of June 30, 2015, and December 31, 2014, respectively.

(3) 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 June 30, 2015, and December 31, 2014.

The following tables provide information regarding the offsetting of derivative liabilities and securities sold under agreements to repurchase within the consolidated balance sheets as of June 30, 2015, and December 31, 2014.

Table 67: Offsetting of Derivative Liabilities and Securities Sold Under Agreements to Repurchase

June 30, 2015
(In Millions)	Gross Recognized Liabilities		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (2)
Derivative Liabilities (1)
Foreign Exchange Contracts OTC	$	1,570.5	$	1,232.9	$	337.6	$	—	$	337.6
Interest Rate Swaps OTC		101.3		30.3		71.0		—		71.0
Interest Rate Swaps Exchange Cleared		19.2		19.2		—		—		—
Other Financial Derivatives		11.3		—		11.3		—		11.3
Cross Product Netting Adjustment		—		27.7		—		—		—
Cross Product Collateral Adjustment		—		151.7		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		1,702.3		1,461.8		240.5		—		240.5
Total Derivatives Not Subject to a Master Netting Arrangement		904.9		—		904.9		—		904.9
Total Derivatives		2,607.2		1,461.8		1,145.4		—		1,145.4
Securities Sold under Agreements to Repurchase	$	29.8	$	—	$	29.8	$	29.8	$	—

December 31, 2014
(In Millions)	Gross Recognized Liabilities		Gross Amounts Offset		Net Amounts Presented		Gross Amounts Not Offset		Net Amount (2)
Derivative Liabilities (1)
Foreign Exchange Contracts OTC	$	3,431.0	$	1,889.8	$	1,541.2	$	—	$	1,541.2
Interest Rate Swaps OTC		118.7		32.1		86.6		—		86.6
Interest Rate Swaps Exchange Cleared		13.1		13.1		—		—		—
Cross Product Netting Adjustment		—		6.3		—		—		—
Cross Product Collateral Adjustment		—		1,232.0		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,562.8		3,173.3		389.5		—		389.5
Total Derivatives Not Subject to a Master Netting Arrangement		664.5		—		664.5		—		664.5
Total Derivatives		4,227.3		3,173.3		1,054.0		—		1,054.0
Securities Sold under Agreements to Repurchase	$	885.1	$	—	$	885.1	$	885.1	$	—

(1) Derivative liabilities are reported in other liabilities in the consolidated balance sheets. Other liabilities (excluding derivative liabilities) totaled $2,519.5 million and $2,794.1 million as of June 30, 2015, and December 31, 2014, respectively.

(2) 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 June 30, 2015, and December 31, 2014.

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 set off 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.

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. Northern Trust centrally clears those interest rate derivative instruments addressed under Title VII of the Dodd-Frank Wall Street Reform and Consumer Protection Act. These transactions are subject to an agreement similar to a master netting arrangement which has the same rights of offset as described above.

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Derivative Financial Instruments

6 Months Ended

Jun. 30, 2015

Derivative Financial Instruments

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 include foreign exchange contracts, interest rate contracts and other contracts.

Northern Trust’s primary risks associated with foreign exchange and interest rate instruments are the possibility that interest rates or foreign exchange rates could change in an unanticipated manner, resulting in higher costs or a loss in the underlying value of the instrument. These risks are mitigated by establishing limits, monitoring the level of actual positions taken against such established limits and monitoring the level of any interest rate sensitivity gaps created by such positions. When establishing position limits, market liquidity and volatility, as well as experience in each market, are taken into account.

Credit risk associated with derivative instruments relates to the failure of the counterparty to pay based on the contractual terms of the agreement, and is generally limited to the unrealized fair value gains on these instruments, net of any cash collateral received. The amount of credit risk will increase or decrease during the lives of the instruments as interest rates, foreign exchange rates or other underlying exposures 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.

All derivative financial instruments, whether designated as hedges or not, are recorded in the consolidated balance sheets at fair value within other assets or other liabilities. As noted in the discussions below, the manner in which changes in the fair value of a derivative is accounted for in the consolidated statements of income depends on whether the contract has been designated as a hedge and qualifies for hedge accounting under GAAP. 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. Derivative assets and liabilities recorded in the consolidated balance sheets were each reduced by $1.3 billion and $1.9 billion as of June 30, 2015, and December 31, 2014, respectively, as a result of master netting arrangements and similar agreements in place. Derivative assets and liabilities recorded at June 30, 2015, also reflect reductions of $387.9 million and $151.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties, respectively. This compares with reductions of derivative assets and liabilities of $315.8 million and $1.2 billion, respectively, at December 31, 2014. Additional cash collateral received from and deposited with derivative counterparties totaling $127.2 million and $41.5 million, respectively, as of June 30, 2015, and $19.6 million and $153.2 million, respectively, as of December 31, 2014, were not offset against derivative assets and liabilities in the consolidated balance sheets as the amounts exceeded the net derivative positions with those counterparties. Northern Trust centrally clears eligible interest rate derivative instruments as required under Title VII of the Dodd-Frank Wall Street Reform and Consumer Protection Act. Securities posted as collateral for these transactions totaled $17.2 million and $27.4 million at June 30, 2015, and December 31, 2014, respectively, are not offset against derivative assets and liabilities in the consolidated balance sheets, and the counterparty receiving the securities as collateral does not have the right to repledge or sell the securities.

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 $57.5 million and $299.5 million at June 30, 2015, and December 31, 2014, respectively. Cash collateral amounts deposited with derivative counterparties on those dates included $22.4 million and $272.9 million, respectively, posted against these liabilities, resulting in a net maximum amount of termination payments that could have been required at June 30, 2015, and December 31, 2014, of $35.1 million and $26.6 million, respectively. Accelerated settlement of these liabilities would not have a material effect on the consolidated financial position or liquidity of Northern Trust.

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 purposes and risk management. 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 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 offsetting contracts with outside counterparties. It 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.

Client-Related and Trading Derivative Instruments. Approximately 97% of Northern Trust’s derivatives outstanding at June 30, 2015, and December 31, 2014, measured on a notional value basis, relate to client-related and trading activities. 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.

The following table shows the notional and fair values of client-related and trading derivative financial instruments. 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, which is significantly less than the notional amount.

Table 58: Notional and Fair Values of Client-Related and Trading Derivative Financial Instruments

	June 30, 2015						December 31, 2014
	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	264,964.1	$	2,451.3	$	2,416.7	$	257,568.7	$	4,149.5	$	4,072.0
Interest Rate Contracts		5,576.0		96.5		93.1		5,353.8		105.5		101.3
Total	$	270,540.1	$	2,547.8	$	2,509.8	$	262,922.5	$	4,255.0	$	4,173.3

Changes in the fair value of client-related and trading derivative instruments are recognized currently in income. The following table shows the location and amount of gains and losses recorded in the consolidated statements of income for the three and six months ended June 30, 2015, and 2014.

Table 59: Location and Amount of Gains and Losses Recorded in Income

		Amount of Derivative Gain/(Loss) Recognized in Income
	Location of Derivative Gain/(Loss) Recognized in Income	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)		2015		2014		2015		2014
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	74.8	$	52.9	$	146.4	$	103.0
Interest Rate Contracts	Security Commissions and Trading Income		3.0		2.1		7.9		4.0
Total		$	77.8	$	55.0	$	154.3	$	107.0

Risk Management Instruments. Northern Trust uses derivative instruments to hedge its exposure to foreign currency, interest rate and other risks. 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.

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.

The following table identifies the types and classifications of derivative instruments formally designated as hedges under GAAP and used by Northern Trust to manage risk, their notional and fair values, and the respective risks addressed.

Table 60: Notional and Fair Values of Designated Risk Management Derivative Financial Instruments

			June 30, 2015						December 31, 2014
	Derivative Instrument	Risk Classification	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)					Asset		Liability				Asset		Liability
Fair Value Hedges
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate	$	2,720.4	$	11.7	$	25.3	$	2,859.5	$	12.7	$	28.5
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Rate		1,250.0		93.2		2.1		1,250.0		112.8		2.0
Cash Flow Hedges
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		413.4		6.9		14.8		344.9		6.0		14.8
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate		10.0		—		—		10.0		—		—
Available for Sale Investment Securities	Interest Rate Option Contracts	Interest Rate		725.0		2.8		—		625.0		1.3		—
Net Investment Hedges
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		1,870.1		22.9		43.2		1,795.4		118.9		3.4
Total			$	6,988.9	$	137.5	$	85.4	$	6,884.8	$	251.7	$	48.7

In addition to the above, Sterling denominated debt, totaling $243.9 million at December 31, 2014, was designated as a hedge of the foreign exchange associated with the net investment in certain non-U.S. affiliates. This debt matured during the quarter ended March 31, 2015.

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. For a fair value hedge, 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 recorded currently in income. The following table shows the location and amount of derivative gains and losses recorded in the consolidated statements of income related to fair value hedges for the three and six months ended June 30, 2015 and 2014.

Table 61: Location and Amount of Derivative Gains and Losses Recorded in Income

		Location of Derivative Gain/(Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
	Derivative Instrument		Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)			2015			2014			2015			2014
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Income	$	5.0		$	(14.9	)	$	(12.3	)	$	(27.0	)
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Expense		(27.7	)		27.7			2.1			60.2
Total			$	(22.7	)	$	12.8		$	(10.2	)	$	33.2

Northern Trust applies the “shortcut” method of accounting, available under GAAP, to substantially all of its fair value hedges, which assumes there is no ineffectiveness in a hedge. As a result, changes recorded in the fair value of the hedged item are equal to the offsetting gain or loss on the derivative and are reflected in the same line item. For fair value hedges that do not qualify for the “shortcut” method of accounting, Northern Trust utilizes regression analysis, the “long-haul” method of accounting, in assessing whether the hedging relationships are highly effective at inception and quarterly thereafter. Ineffectiveness resulting from fair value hedges is recorded in either interest income or interest expense. There was no ineffectiveness or changes in the fair value of hedged items recognized in earnings for fair value hedges accounted for under the “long-haul” method of accounting during the three- and six-month periods ended June 30, 2015, and 2014.

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. The effective portion of changes in the fair value of such derivatives is recognized in AOCI, a component of stockholders’ equity, and there is no change in the accounting for the hedged item. Balances in AOCI are reclassified to earnings when the hedged forecasted transaction impacts earnings. Northern Trust applies the “shortcut” method of accounting for cash flow hedges of certain available for sale investment securities. For cash flow hedges of certain other available for sale investment securities and forecasted foreign currency denominated revenue and expenditure transactions, Northern Trust closely matches all terms of the hedged item and the hedging derivative at inception and on an ongoing basis which limits hedge ineffectiveness. For cash flow hedges of available for sale investment securities, to the extent all terms are not perfectly matched, effectiveness is assessed using regression analysis and any ineffectiveness is measured using the hypothetical derivative method. For cash flow hedges of forecasted foreign currency denominated revenue and expenditure transactions, to the extent all terms are not perfectly matched, effectiveness is assessed using the dollar-offset method and any ineffectiveness is measured using the hypothetical derivative method. There was no ineffectiveness recognized in earnings for cash flow hedges during the three and six months ended June 30, 2015 and 2014. As of June 30, 2015, 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 cash flow hedge derivative gains and losses recognized in AOCI and the amounts reclassified to earnings during the three and six months ended June 30, 2015 and 2014.

Table 62: Cash Flow Hedge Derivative Gains and Losses Recognized in AOCI and Reclassified to Earnings

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Option Contracts (Before Tax)
Three Months Ended June 30,	2015			2014			2015			2014
Net Gain/(Loss) Recognized in AOCI	$	6.5		$	(1.3	)	$	(1.7	)	$	—
Net Gain/(Loss) Reclassified from AOCI to Net Income
Other Operating Income		(2.3	)		1.9			—			—
Interest Income		—			—			1.2			—
Other Operating Expense		(0.3	)		—			—			—
Total	$	(2.6	)	$	1.9		$	1.2		$	—

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Option Contracts (Before Tax)
Six Months Ended June 30,	2015			2014			2015		2014
Net Gain/(Loss) Recognized in AOCI	$	(1.4	)	$	1.1		$	1.5	$	—
Net Gain/(Loss) Reclassified from AOCI to Net Income
Other Operating Income		(3.9	)		2.7			—		—
Interest Income		—			—			2.4		—
Other Operating Expense		(0.8	)		(0.2	)		—		—
Total	$	(4.7	)	$	2.5		$	2.4	$	—

During the three and six months ended June 30, 2015 and 2014, there were no transactions discontinued due to the original forecasted transactions no longer being probable of occurring. It is estimated that a net loss of $6.4 million will be reclassified into net income within the next twelve months relating to cash flow hedges of foreign-currency-denominated transactions. It is estimated that a net gain of $3.8 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 investment securities.

Certain foreign exchange contracts and qualifying nonderivative instruments 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. The effective portion of changes in the fair value of the hedging instrument is recognized in AOCI consistent with the related translation gains and losses of the hedged net investment. For net investment hedges, all critical terms of the hedged item and the hedging instrument are matched at inception and on an ongoing basis to minimize the risk of hedge ineffectiveness. To the extent all terms are not perfectly matched, any ineffectiveness is measured using the hypothetical derivative method. Ineffectiveness resulting from net investment hedges is recorded in other operating income. There was no ineffectiveness recorded during the three and six months ended June 30, 2015 and 2014. Amounts recorded in AOCI are reclassified to net income only upon the sale or liquidation of an investment in a non-U.S. branch or subsidiary.

The following table provides net investment hedge gains and losses recognized in AOCI during the three and six months ended June 30, 2015 and 2014.

Table 63: Net Investment Hedge Gains and Losses Recognized in AOCI

	Hedging Gain/(Loss) Recognized in OCI (Before Tax)
	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2015			2014			2015		2014
Foreign Exchange Contracts	$	(81.1	)	$	(22.9	)	$	30.5	$	(31.9	)
Sterling Denominated Subordinated Debt		—			(6.7	)		5.0		(8.3	)
Total	$	(81.1	)	$	(29.6	)	$	35.5	$	(40.2	)

Derivatives that are not formally designated as hedges under GAAP are entered into for risk management purposes. Foreign exchange contracts are 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. For a description of the swap related to the sale of certain Visa Class B common shares, see “Level 3” under Note 3 – Fair Value Measurements. The following table identifies the types of risk management derivative instruments not formally designated as hedges and their notional amounts and fair values.

Table 64: Notional and Fair Values of Non-Designated Risk Management Derivative Instruments

(In Millions)	June 30, 2015						December 31, 2014
	Notional Value		Fair Value				Notional Value		Fair Value
			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	205.6	$	1.0	$	0.7	$	246.3	$	0.8	$	5.3
Other Financial Derivatives (1)		110.7		—		11.3		—		—		—
Total	$	316.3	$	1.0	$	12.0	$	246.3	$	0.8	$	5.3

(1) This line includes a swap related to the sale of certain Visa Class B common shares.

Changes in the fair value of derivative instruments not formally designated as hedges 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 six months ended June 30, 2015 and 2014.

Table 65: Location and Amount of Gains and Losses Recorded in Income for Non-Designated Risk Management Derivative Instruments

(In Millions)	Location of Derivative Gain/ (Loss) Recognized in Income		Amount of Derivative Gain/(Loss) Recognized in Income
			Three Months Ended June 30,					Six Months Ended June 30,
			2015			2014		2015			2014
Foreign Exchange Contracts		Other Operating Income		6.6			1.5		(2.1	)		0.8
Other Financial Derivatives (1)		Other Operating Income		(11.3	)		—		(11.3	)		—
Total			$	(4.7	)	$	1.5	$	(13.4	)	$	0.8

(1) This line includes a swap related to the sale of certain Visa Class B common shares.

XML

Securities Continuous Unrealized Loss Position (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	$ 8,487.7	$ 7,101.7
Less than 12 Months Unrealized Losses	25.8	26.5
12 Months or Longer Fair Value	2,231.5	3,309.1
12 Months or Longer Unrealized Losses	37.0	61.1
Total Fair Value	10,719.2	10,410.8
Total Unrealized Losses	62.8	87.6
U.S. Government
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value		998.2
Less than 12 Months Unrealized Losses		1.7
Total Fair Value		998.2
Total Unrealized Losses		1.7
U.S. Government Sponsored Agency
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	3,285.0	2,344.9
Less than 12 Months Unrealized Losses	8.2	6.6
12 Months or Longer Fair Value	914.3	1,730.0
12 Months or Longer Unrealized Losses	7.9	12.9
Total Fair Value	4,199.3	4,074.9
Total Unrealized Losses	16.1	19.5
Non-U.S. Government
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	212.7	292.9
Less than 12 Months Unrealized Losses	0.4	0.4
Total Fair Value	212.7	292.9
Total Unrealized Losses	0.4	0.4
Corporate Debt
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	943.8	1,244.5
Less than 12 Months Unrealized Losses	3.8	3.9
12 Months or Longer Fair Value	1,087.0	1,338.8
12 Months or Longer Unrealized Losses	15.3	37.7
Total Fair Value	2,030.8	2,583.3
Total Unrealized Losses	19.1	41.6
Covered Bonds
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	154.3	142.3
Less than 12 Months Unrealized Losses	0.2	0.2
12 Months or Longer Fair Value		10.0
12 Months or Longer Unrealized Losses		0.1
Total Fair Value	154.3	152.3
Total Unrealized Losses	0.2	0.3
Supranational and Non-U.S. Agency Bonds
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value		313.2
Less than 12 Months Unrealized Losses		0.3
12 Months or Longer Fair Value		175.5
12 Months or Longer Unrealized Losses		1.1
Total Fair Value		488.7
Total Unrealized Losses		1.4
Residential Mortgage-Backed
Investments, Unrealized Loss Position [Line Items]
12 Months or Longer Fair Value		4.5
12 Months or Longer Unrealized Losses		0.5
Total Fair Value		4.5
Total Unrealized Losses		0.5
Other Asset-Backed
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	1,233.7	1,297.6
Less than 12 Months Unrealized Losses	0.5	1.0
Total Fair Value	1,233.7	1,297.6
Total Unrealized Losses	0.5	1.0
Certificates of Deposit
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	1,878.5	438.6
Less than 12 Months Unrealized Losses	0.6	0.1
Total Fair Value	1,878.5	438.6
Total Unrealized Losses	0.6	0.1
Auction Rate Securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	1.5	2.4
Less than 12 Months Unrealized Losses	0.1	0.2
12 Months or Longer Fair Value	4.6	4.7
12 Months or Longer Unrealized Losses	0.5	0.6
Total Fair Value	6.1	7.1
Total Unrealized Losses	0.6	0.8
Others
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	16.2	27.1
Less than 12 Months Unrealized Losses	10.8	12.1
12 Months or Longer Fair Value	48.2	45.6
12 Months or Longer Unrealized Losses	13.0	8.2
Total Fair Value	64.4	72.7
Total Unrealized Losses	23.8	$ 20.3
Sub-Sovereign, Supranational and Non US Agency Bonds
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	709.5
Less than 12 Months Unrealized Losses	1.0
12 Months or Longer Fair Value	177.4
12 Months or Longer Unrealized Losses	0.3
Total Fair Value	886.9
Total Unrealized Losses	1.3
Commercial Mortgage-Backed
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	52.5
Less than 12 Months Unrealized Losses	0.2
Total Fair Value	52.5
Total Unrealized Losses	$ 0.2

XML

Fair Value Measurements - Additional Information (Detail) shares in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) Securities shares	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) Securities
Fair Value Disclosures [Line Items]
Available for sale securities portfolio, value	$ 31,835,600,000		$ 29,558,500,000
Trading account securities	1,200,000		$ 4,700,000
Transfers into Level 3 assets	0	$ 0
Transfers out of Level 3 assets	0	0
Transfers into Level 3 liabilities	0	0
Transfers out of Level 3 liabilities	$ 0	0
Level 2
Fair Value Disclosures [Line Items]
Number of available for sale securities portfolio | Securities	975		881
Available for sale securities portfolio, value	$ 26,800,000,000		$ 25,000,000,000
Fair Value, Measurements, Nonrecurring | Level 3 | Loans
Fair Value Disclosures [Line Items]
Financial Instrument, fair value assets	20,900,000	16,900,000
Fair Value, Measurements, Nonrecurring | Level 3 | Other Real Estate Owned
Fair Value Disclosures [Line Items]
Financial Instrument, fair value assets	$ 300,000	$ 1,400,000
External Pricing | Level 2
Fair Value Disclosures [Line Items]
Number of available for sale securities portfolio | Securities	975		881
Trading account securities	$ 1,200,000		$ 4,700,000
Visa Class B
Fair Value Disclosures [Line Items]
Number of common stock shares sold | shares	1.0

XML

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

Assets and Liabilities Measured at Fair Value on Recurring Basis Segregated by Fair Value Hierarchy Level

The following tables present assets and liabilities measured at fair value on a recurring basis as of June 30, 2015 and December 31, 2014, segregated by fair value hierarchy level.

Table 29: Recurring Basis Hierarchy Leveling

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
June 30, 2015
Securities
Available for Sale
U.S. Government	$	5,018.8	$	—	$	—	$	—		$	5,018.8
Obligations of States and Political Subdivisions		—		4.5		—		—			4.5
Government Sponsored Agency		—		16,765.4		—		—			16,765.4
Non-U.S. Government		—		311.0		—		—			311.0
Corporate Debt		—		3,734.8		—		—			3,734.8
Covered Bonds		—		1,982.2		—		—			1,982.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		—		560.7		—		—			560.7
Other Asset-Backed		—		3,119.2		—		—			3,119.2
Auction Rate		—		—		16.6		—			16.6
Commercial Mortgage-Backed		—		198.7		—		—			198.7
Other		—		123.7		—		—			123.7
Total Available for Sale		5,018.8		26,800.2		16.6		—			31,835.6
Trading Account		—		1.2		—		—			1.2
Total Available for Sale and Trading Securities		5,018.8		26,801.4		16.6		—			31,836.8
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		2,482.1		—		—			2,482.1
Interest Rate Contracts		—		204.2		—		—			204.2
Total Derivative Assets		—		2,686.3		—		(1,698.0	)		988.3
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		2,475.4		—		—			2,475.4
Interest Rate Contracts		—		120.5		—		—			120.5
Other Financial Derivatives (1)		—		—		11.3		—			11.3
Total Derivative Liabilities	$	—	$	2,595.9	$	11.3	$	(1,461.8	)	$	1,145.4

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 June 30, 2015, derivative assets and liabilities shown above also include reductions of $387.9 million and $151.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(1) This line includes a swap related to the sale of certain Visa Class B common shares.

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
December 31, 2014
Securities
Available for Sale
U.S. Government	$	4,506.9	$	—	$	—	$	—		$	4,506.9
Obligations of States and Political Subdivisions		—		4.6		—		—			4.6
Government Sponsored Agency		—		16,389.2		—		—			16,389.2
Non-U.S. Government		—		310.4		—		—			310.4
Corporate Debt		—		3,577.7		—		—			3,577.7
Covered Bonds		—		1,907.5		—		—			1,907.5
Supranational and Non-U.S. Agency Bonds		—		360.6		—		—			360.6
Residential Mortgage-Backed		—		6.4		—		—			6.4
Other Asset-Backed		—		2,321.3		—		—			2,321.3
Auction Rate		—		—		18.1		—			18.1
Other		—		155.8		—		—			155.8
Total Available for Sale		4,506.9		25,033.5		18.1		—			29,558.5
Trading Account		—		4.7		—		—			4.7
Total Available for Sale and Trading Securities		4,506.9		25,038.2		18.1		—			29,563.2
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		4,275.2		—		—			4,275.2
Interest Rate Contracts		—		232.3		—		—			232.3
Total Derivative Assets		—		4,507.5		—		(2,257.1	)		2,250.4
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		4,095.5		—		—			4,095.5
Interest Rate Contracts		—		131.8		—		—			131.8
Total Derivative Liabilities	$	—	$	4,227.3	$	—	$	(3,173.3	)	$	1,054.0

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, 2014, derivative assets and liabilities shown above also include reductions of $315.8 million and $1.2 billion, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

Changes in Level 3 Assets

The following tables present the changes in Level 3 assets and liabilities for the three and six months ended June 30, 2015, and 2014.

Table 30: Changes in Level 3 Assets

Level 3 Assets (In Millions)	Auction Rate Securities
Three Months Ended June 30,	2015			2014
Fair Value at April 1	$	17.5		$	98.5
Total Gains (Losses):
Included in Other Comprehensive Income (1)		0.5			0.5
Purchases, Issues, Sales, and Settlements
Sales		(1.2	)		—
Settlements		(0.2	)		(0.2	)
Fair Value at June 30	$	16.6		$	98.8
Six Months Ended June 30,	2015			2014
Fair Value at January 1	$	18.1		$	98.9
Total Gains (Losses):
Included in Other Comprehensive Income (1)		0.2			0.3
Purchases, Issues, Sales, and Settlements
Sales		(1.2	)		0.1
Settlements		(0.5	)		(0.5	)
Fair Value at June 30	$	16.6		$	98.8

(1) Unrealized gains (losses) are included in net unrealized gains (losses) on securities available for sale in the consolidated statements of comprehensive income.

Changes in Level 3 Liabilities

Table 31: Changes in Level 3 Liabilities

Level 3 Liabilities (In Millions)	Contingent Consideration					Swap Related to Sale of Certain Visa Class B Common Shares
Three Months Ended June 30,	2015		2014			2015		2014
Fair Value at April 1	$	—	$	—		$	—	$	—
Total (Gains) Losses:
Included in Earnings (1)		—		—			11.3		—
Included in Other Comprehensive Income		—		—			—		—
Purchases, Issues, Sales, and Settlements
Purchases		—		—			—		—
Settlements		—		—			—		—
Fair Value at June 30	$	—	$	—		$	11.3	$	—
Six Months Ended June 30,	2015		2014			2015		2014
Fair Value at January 1	$	—	$	55.4		$	—	$	—
Total (Gains) Losses:
Included in Earnings (1)		—		(0.1	)		11.3		—
Included in Other Comprehensive Income		—		—			—		—
Purchases, Issues, Sales, and Settlements
Purchases		—		—			—		—
Settlements		—		(55.3	)		—		—
Fair Value at June 30	$	—	$	—		$	11.3	$	—

(1) (Gains) losses are recorded in other operating income (expense) in the consolidated statements of income.

Book and Fair Values of All Financial Instruments

The following tables summarize the fair values of all financial instruments.

Table 33: Fair Value of Financial Instruments

(In Millions)	June 30, 2015
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	7,152.9	$	7,152.9	$	7,152.9	$	—	$	—
Federal Funds Sold and Resell Agreements		1,020.0		1,020.0		—		1,020.0		—
Interest-Bearing Deposits with Banks		15,650.3		15,650.3		—		15,650.3		—
Federal Reserve Deposits		17,488.7		17,488.7		—		17,488.7		—
Securities
Available for Sale (1)		31,835.6		31,835.6		5,018.8		26,800.2		16.6
Held to Maturity		6,990.8		6,986.4		—		6,986.4		—
Trading Account		1.2		1.2		—		1.2		—
Loans (excluding Leases)
Held for Investment		31,863.4		32,022.3		—		—		32,022.3
Held for Sale		3.9		3.9		—		—		3.9
Client Security Settlement Receivables		2,034.2		2,034.2		—		2,034.2		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		178.1		178.1		—		178.1		—
Community Development Investments		187.4		186.2		—		186.2		—
Employee Benefit and Deferred Compensation		161.3		161.1		109.5		51.6		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	46,237.5	$	46,237.5	$	46,237.5	$	—	$	—
Savings Certificates and Other Time		1,540.5		1,554.4		—		1,554.4		—
Non U.S. Offices Interest-Bearing		52,909.9		52,909.9		—		52,909.9		—
Federal Funds Purchased		351.3		351.3		—		351.3		—
Securities Sold under Agreements to Repurchase		29.8		29.8		—		29.8		—
Other Borrowings		3,322.9		3,325.2		—		3,325.2		—
Senior Notes		1,497.2		1,534.1		—		1,534.1		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,330.1		1,338.3		—		1,338.3		—
Floating Rate Capital Debt		277.3		244.6		—		244.6		—
Other Liabilities
Standby Letters of Credit		43.5		43.5		—		—		43.5
Loan Commitments		25.6		25.6		—		—		25.6
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	30.8	$	30.8	$	—	$	30.8	$	—
Liabilities		58.7		58.7		—		58.7		—
Interest Rate Contracts
Assets		107.7		107.7		—		107.7		—
Liabilities		27.4		27.4		—		27.4		—
Other Financial Derivatives (2)
Liabilities		11.3		11.3		—		—		11.3
Client-Related and Trading
Foreign Exchange Contracts
Assets		2,451.3		2,451.3		—		2,451.3		—
Liabilities		2,416.7		2,416.7		—		2,416.7		—
Interest Rate Contracts
Assets		96.5		96.5		—		96.5		—
Liabilities		93.1		93.1		—		93.1		—

(1) Refer to the table located on page 39 for the disaggregation of available for sale securities.

(2) This line includes a swap related to the sale of certain Visa Class B common shares.

(In Millions)	December 31, 2014
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	3,050.6	$	3,050.6	$	3,050.6	$	—	$	—
Federal Funds Sold and Resell Agreements		1,062.7		1,062.7		—		1,062.7		—
Interest-Bearing Deposits with Banks		14,928.3		14,928.3		—		14,928.3		—
Federal Reserve Deposits		17,386.3		17,386.3		—		17,386.3		—
Securities
Available for Sale (1)		29,558.5		29,558.5		4,506.9		25,033.5		18.1
Held to Maturity		4,170.8		4,176.1		—		4,176.1		—
Trading Account		4.7		4.7		—		4.7		—
Loans (excluding Leases)
Held for Investment		30,458.0		30,600.4		—		—		30,600.4
Held for Sale		2.5		2.5		—		—		2.5
Client Security Settlement Receivables		1,568.8		1,568.8		—		1,568.8		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		207.5		207.5		—		207.5		—
Community Development Investments		209.9		210.8		—		210.8		—
Employee Benefit and Deferred Compensation		143.2		146.7		96.7		50.0		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	41,454.6	$	41,454.6	$	41,454.6	$	—	$	—
Savings Certificates and Other Time		1,757.4		1,757.0		—		1,757.0		—
Non U.S. Offices Interest-Bearing		47,545.0		47,545.0		—		47,545.0		—
Federal Funds Purchased		932.9		932.9		—		932.9		—
Securities Sold under Agreements to Repurchase		885.1		885.1		—		885.1		—
Other Borrowings		1,685.2		1,686.2		—		1,686.2		—
Senior Notes		1,497.0		1,541.8		—		1,541.8		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,583.3		1,583.4		—		1,583.4		—
Floating Rate Capital Debt		277.2		242.8		—		242.8		—
Other Liabilities
Standby Letters of Credit		60.1		60.1		—		—		60.1
Loan Commitments		28.3		28.3		—		—		28.3
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	125.7	$	125.7	$	—	$	125.7	$	—
Liabilities		23.5		23.5		—		23.5		—
Interest Rate Contracts
Assets		126.8		126.8		—		126.8		—
Liabilities		30.5		30.5		—		30.5		—
Client-Related and Trading
Foreign Exchange Contracts
Assets		4,149.5		4,149.5		—		4,149.5		—
Liabilities		4,072.0		4,072.0		—		4,072.0		—
Interest Rate Contracts
Assets		105.5		105.5		—		105.5		—
Liabilities		101.3		101.3		—		101.3		—

(1) Refer to the table located on page 40 for the disaggregation of available for sale securities.

Fair Value, Measurements, Recurring

Valuation Techniques, Significant Unobservable Inputs, and Quantitative Information

The following presents the fair values of, and the valuation techniques, significant unobservable inputs, and quantitative information used to develop significant unobservable inputs for, Northern Trust’s Level 3 assets and liabilities as of June 30, 2015.

Table 28: Level 3 Significant Unobservable Inputs

Financial Instrument	Fair Value		Valuation Technique	Unobservable Inputs	Range of Lives and Rates
Auction Rate Securities	$	16.6 million	Discounted Cash Flow	Remaining lives Discount rates	0.9 — 8.6 years 0.1% — 8.1%
Swap Related to Sale of Certain Visa Class B Common Shares	$	11.3 million	Discounted Cash Flow	Visa Class A Appreciation Conversion Rate Expected Conversion Rate	10-15% 1.61x — 1.65x 2-5 years

Fair Value, Measurements, Nonrecurring

Valuation Techniques, Significant Unobservable Inputs, and Quantitative Information

The following table provides the fair value of, and the valuation technique, significant unobservable inputs and quantitative information used to develop the significant unobservable inputs for, Northern Trust’s Level 3 assets that were measured at fair value on a nonrecurring basis as of June 30, 2015.

Table 32: Level 3 Nonrecurring Basis Significant Unobservable Inputs

Financial Instrument	Fair Value	Valuation Technique	Unobservable Input	Range of Discounts Applied
Loans	$20.9 million	Market Approach	Discount to reflect realizable value	15% — 25%
OREO	$0.3 million	Market Approach	Discount to reflect realizable value	15% — 20%

XML

Securities (Tables)

6 Months Ended

Jun. 30, 2015

Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale

The following tables provide the amortized cost and fair values of securities at June 30, 2015, and December 31, 2014.

Table 34: Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale

Securities Available for Sale	June 30, 2015
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	4,993.5	$	25.3	$	—	$	5,018.8
Obligations of States and Political Subdivisions		4.5		—		—		4.5
Government Sponsored Agency		16,690.1		91.4		16.1		16,765.4
Non-U.S. Government		310.3		0.7		—		311.0
Corporate Debt		3,749.1		4.8		19.1		3,734.8
Covered Bonds		1,975.5		6.9		0.2		1,982.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		560.0		1.2		0.5		560.7
Other Asset-Backed		3,118.5		1.2		0.5		3,119.2
Auction Rate		16.7		0.5		0.6		16.6
Commercial Mortgage-Backed		198.8		0.1		0.2		198.7
Other		123.5		0.2		—		123.7
Total	$	31,740.5	$	132.3	$	37.2	$	31,835.6

Securities Available for Sale	December 31, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	4,493.5	$	15.1	$	1.7	$	4,506.9
Obligations of States and Political Subdivisions		4.5		0.1		—		4.6
Government Sponsored Agency		16,326.4		82.3		19.5		16,389.2
Non-U.S. Government		309.5		0.9		—		310.4
Corporate Debt		3,617.5		1.8		41.6		3,577.7
Covered Bonds		1,899.9		7.9		0.3		1,907.5
Supranational and Non-U.S. Agency Bonds		360.0		1.5		0.9		360.6
Residential Mortgage-Backed		6.9		—		0.5		6.4
Other Asset-Backed		2,321.8		0.5		1.0		2,321.3
Auction Rate		18.4		0.5		0.8		18.1
Other		155.7		0.3		0.2		155.8
Total	$	29,514.1	$	110.9	$	66.5	$	29,558.5

Reconciliation of Amortized Cost to Fair Values of Securities Held to Maturity

Table 35: Reconciliation of Amortized Cost to Fair Value of Securities Held to Maturity

Securities Held to Maturity	June 30, 2015
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	103.4	$	5.9	$	—	$	109.3
Government Sponsored Agency		11.5		0.9		—		12.4
Covered Bonds		125.9		0.1		—		126.0
Non-U.S. Government		1,363.9		6.2		0.4		1,369.7
Certificates of Deposit		3,036.8		0.1		0.6		3,036.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		2,266.4		8.0		0.8		2,273.6
Other		82.9		—		23.8		59.1
Total	$	6,990.8	$	21.2	$	25.6	$	6,986.4

Securities Held to Maturity	December 31, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	121.9	$	7.4	$	—	$	129.3
Government Sponsored Agency		18.4		1.1		—		19.5
Non-U.S. Government		1,281.6		6.6		0.4		1,287.8
Certificates of Deposit		924.3		0.1		0.1		924.3
Supranational and Non-U.S. Agency Bonds		1,745.8		10.9		0.5		1,756.2
Other		78.8		0.3		20.1		59.0
Total	$	4,170.8	$	26.4	$	21.1	$	4,176.1

Securities Continuous Unrealized Loss Position

The following tables provide information regarding securities that had been in a continuous unrealized loss position for less than 12 months and for 12 months or longer as of June 30, 2015, and December 31, 2014.

Table 37: Securities with Unrealized Losses

Securities with Unrealized Losses as of June 30, 2015	Less than 12 Months				12 Months or Longer				Total
(In Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Government Sponsored Agency		3,285.0		8.2		914.3		7.9		4,199.3		16.1
Non-U.S. Government		212.7		0.4		—		—		212.7		0.4
Corporate Debt		943.8		3.8		1,087.0		15.3		2,030.8		19.1
Covered Bonds		154.3		0.2		—		—		154.3		0.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		709.5		1.0		177.4		0.3		886.9		1.3
Other Asset-Backed		1,233.7		0.5		—		—		1,233.7		0.5
Certificates of Deposit		1,878.5		0.6		—		—		1,878.5		0.6
Auction Rate		1.5		0.1		4.6		0.5		6.1		0.6
Commercial Mortgage-Backed		52.5		0.2		—		—		52.5		0.2
Other		16.2		10.8		48.2		13.0		64.4		23.8
Total	$	8,487.7	$	25.8	$	2,231.5	$	37.0	$	10,719.2	$	62.8

Securities with Unrealized Losses as of December 31, 2014	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	$	998.2	$	1.7	$	—	$	—	$	998.2	$	1.7
Government Sponsored Agency		2,344.9		6.6		1,730.0		12.9		4,074.9		19.5
Non-U.S. Government		292.9		0.4		—		—		292.9		0.4
Corporate Debt		1,244.5		3.9		1,338.8		37.7		2,583.3		41.6
Covered Bonds		142.3		0.2		10.0		0.1		152.3		0.3
Supranational and Non-U.S. Agency Bonds		313.2		0.3		175.5		1.1		488.7		1.4
Residential Mortgage-Backed		—		—		4.5		0.5		4.5		0.5
Other Asset-Backed		1,297.6		1.0		—		—		1,297.6		1.0
Certificates of Deposit		438.6		0.1		—		—		438.6		0.1
Auction Rate		2.4		0.2		4.7		0.6		7.1		0.8
Other		27.1		12.1		45.6		8.2		72.7		20.3
Total	$	7,101.7	$	26.5	$	3,309.1	$	61.1	$	10,410.8	$	87.6

Credit Related Impairment Losses Recognized in Earnings on Other Than Temporarily Impaired Securities

The table below provides information regarding total other-than-temporarily impaired securities, including noncredit-related amounts recognized in other comprehensive income and net impairment losses recognized in earnings, for the three and six months ended June 30, 2015 and 2014.

Table 38: Net Impairment Losses Recognized in Earnings

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Changes in OTTI Losses*	$	—	$	—	$	—	$	(4.6	)
Noncredit-related Losses Recorded in / (Reclassified from) OCI**		—		—		—		0.7
Net Impairment Losses Recognized in Earnings	$	—	$	—	$	—	$	(3.9	)

* For initial OTTI in the applicable period, the balance includes the excess of the amortized cost over the fair value of the impaired securities. For subsequent impairments of the same security, the balance includes any additional changes in fair value of the security subsequent to its most recently recorded OTTI.

** For initial OTTI in the applicable period, the balance includes the portion of the excess of amortized cost over the fair value of the impaired securities that was recorded in other comprehensive income (OCI). For subsequent impairments of the same security, the balance includes additional changes in OCI for that security subsequent to its most recently recorded OTTI.

Cumulative Credit-Related Losses Recognized in Earnings on Debt Securities Other-Than-Temporarily Impaired

Provided in the table below are the cumulative credit-related losses recognized in earnings on debt securities other-than-temporarily impaired.

Table 39: Cumulative Credit-Related Losses on Securities

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Cumulative Credit-Related Losses on Securities Held — Beginning of Period	$	5.2	$	12.7	$	5.2	$	8.8
Plus: Losses on Newly Identified Impairments		—		—		—		1.8
Additional Losses on Previously Identified Impairments		—		—		—		2.1
Less: Current and Prior Period Losses on Securities Sold During the Period		—		—		—		—
Cumulative Credit-Related Losses on Securities Held — End of Period	$	5.2	$	12.7	$	5.2	$	12.7

Available for Sale Investment Securities

Remaining Maturity of Securities

Remaining Maturity of Securities Available for Sale

	June 30, 2015
(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	7,716.2	$	7,738.2
Due After One Year Through Five Years		19,130.6		19,196.1
Due After Five Years Through Ten Years		3,710.9		3,713.9
Due After Ten Years		1,182.8		1,187.4
Total		31,740.5		31,835.6
Held to Maturity
Due in One Year or Less		3,950.0		3,951.8
Due After One Year Through Five Years		2,976.6		2,990.7
Due After Five Years Through Ten Years		20.6		18.4
Due After Ten Years		43.6		25.5
Total	$	6,990.8	$	6,986.4

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

Held-to-maturity Securities

Remaining Maturity of Securities

Remaining Maturity of Securities Held to Maturity

	June 30, 2015
(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	7,716.2	$	7,738.2
Due After One Year Through Five Years		19,130.6		19,196.1
Due After Five Years Through Ten Years		3,710.9		3,713.9
Due After Ten Years		1,182.8		1,187.4
Total		31,740.5		31,835.6
Held to Maturity
Due in One Year or Less		3,950.0		3,951.8
Due After One Year Through Five Years		2,976.6		2,990.7
Due After Five Years Through Ten Years		20.6		18.4
Due After Ten Years		43.6		25.5
Total	$	6,990.8	$	6,986.4

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

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Consolidated Statement of Cash Flows - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014
Cash Flows from Operating Activities:
Net Income		$ 499.9	$ 363.3
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Investment Security Losses, net	[1]	0.3	3.6
Amortization and Accretion of Securities and Unearned Income, net		27.5	17.2
Provision for Credit Losses		(14.5)	3.0
Depreciation on Buildings and Equipment		46.7	46.5
Pension Plan Contributions		(16.5)	(13.9)
Change in Receivables		(27.7)	140.5
Change in Interest Payable		(8.8)	(10.2)
Change in Collateral With Derivative Counterparties, net		1,152.4	527.9
Other Operating Activities, net		(265.4)	339.2
Net Cash Provided by Operating Activities		1,527.2	1,540.0
Cash Flows from Investing Activities:
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell		42.7	(49.9)
Change in Interest-Bearing Deposits with Banks		(1,036.1)	2,578.7
Net Change in Federal Reserve Deposits		(102.4)	(427.0)
Purchases of Securities - Held to Maturity		(4,712.9)	(3,758.9)
Proceeds from Maturity and Redemption of Securities - Held to Maturity		1,814.5	1,846.0
Purchases of Securities - Available for Sale		(5,507.2)	(6,442.8)
Proceeds from Sale, Maturity and Redemption of Securities - Available for Sale		3,237.4	5,185.3
Change in Loans and Leases		(1,328.4)	(1,318.9)
Purchases of Buildings and Equipment		(42.6)	(32.4)
Purchases and Development of Computer Software		(148.8)	(159.6)
Change in Client Security Settlement Receivables		(472.8)	(234.0)
Other Investing Activities, net		595.9	(271.1)
Net Cash Used in Investing Activities		(7,660.7)	(3,084.6)
Cash Flows from Financing Activities:
Change in Deposits		10,491.8	4,468.0
Change in Federal Funds Purchased		(581.6)	3.4
Change in Securities Sold under Agreements to Repurchase		(855.3)	2.3
Change in Short-Term Other Borrowings		1,545.2	(1,644.8)
Repayments of Senior Notes and Long-Term Debt		(228.4)	(602.4)
Contingent Consideration Liability Payment			(55.3)
Treasury Stock Purchased		(203.9)	(237.9)
Net Proceeds from Stock Options		75.8	69.4
Cash Dividends Paid on Common Stock		(154.1)	(149.9)
Cash Dividends Paid on Preferred Stock		(15.3)
Other Financing Activities, net		155.7	362.2
Net Cash Provided by Financing Activities		10,229.9	2,215.0
Effect of Foreign Currency Exchange Rates on Cash		5.9	112.4
Increase in Cash and Due from Banks		4,102.3	782.8
Cash and Due from Banks at Beginning of Year		3,050.6	3,162.4
Cash and Due from Banks at End of Period		7,152.9	3,945.2
Supplemental Disclosures of Cash Flow Information:
Interest Paid		85.6	108.4
Income Taxes Paid		224.1	74.1
Transfers from Loans to OREO		8.6	8.7
Computer Software
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangibles		126.6	113.0
Other Intangible Assets
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangibles		$ 6.7	$ 9.9

[1] Changes in Other-Than-Temporary-Impairment (OTTI) Losses $ - $ - $ - $ (4.6 ) Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI - - - 0.7 Other Security Gains (Losses), net (0.4 ) 0.4 (0.3 ) 0.3 Investment Security Gains (Losses), net $ (0.4 ) $ 0.4 $ (0.3 ) $ (3.6 )

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Securities Sold Under Agreements to Repurchase (Tables)

6 Months Ended

Jun. 30, 2015

Repurchase Agreements Accounted for as Secured Borrowings

The following table provides information regarding repurchase agreements that are accounted for as secured borrowings as of June 30, 2015.

Table 40: Repurchase Agreements Accounted for as Secured Borrowings

	June 30, 2015
(In Millions)	Remaining Contractual Maturity of the Agreements
Repurchase Agreements	Overnight and Continuous
U.S. Treasury and Agency Securities	$	29.8
Total Borrowings	$	29.8
Gross Amount of Recognized Liabilities for Repurchase Agreements in footnote 21	$	29.8
Amounts related to agreements not included in footnote 21	$	—

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Components of Company's Net Periodic Benefit Cost (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
U.S. Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	$ 9.4	$ 8.2	$ 18.9	$ 16.4
Interest Cost	11.2	11.1	22.4	22.2
Expected Return on Plan Assets	(24.1)	(24.5)	(48.2)	(48.9)
Amortization
Net Actuarial Loss (Gain)	7.4	5.3	14.8	10.7
Prior Service Cost	(0.1)	(0.1)	(0.2)	(0.2)
Net Periodic Expense (Benefit)	3.8		7.7	0.2
Non U.S. Plans
Defined Benefit plan Net periodic benefit cost
Interest Cost	1.4	1.8	2.8	3.5
Expected Return on Plan Assets	(1.4)	(1.8)	(2.9)	(3.5)
Amortization
Net Actuarial Loss (Gain)	0.4	(0.4)	0.8	(0.8)
Net Periodic Expense (Benefit)	0.4	(0.4)	0.7	(0.8)
Supplemental Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	0.9	0.7	1.8	1.5
Interest Cost	1.2	1.2	2.5	2.4
Amortization
Net Actuarial Loss (Gain)	1.9	1.4	3.7	2.9
Prior Service Cost	0.1	0.1	0.1	0.2
Net Periodic Expense (Benefit)	4.1	3.4	8.1	7.0
Postretirement Health Care Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	0.1	0.1	0.1	0.1
Interest Cost	0.4	0.3	0.7	0.7
Amortization
Net Actuarial Loss (Gain)		(0.2)		(0.3)
Net Periodic Expense (Benefit)	$ 0.5	$ 0.2	$ 0.8	$ 0.5

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Pension and Postretirement Health Care (Tables)

6 Months Ended

Jun. 30, 2015

Components of Company's Net Periodic Benefit Cost

The following tables set forth the net periodic pension and postretirement benefit expense for Northern Trust’s U.S. and non-U.S. pension plans, supplemental pension plan, and postretirement health care plan for the three and six months ended June 30, 2015 and 2014.

Table 56: Net Periodic Pension Expense (Benefit)

Net Periodic Pension Expense U.S. Plan	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2015			2014			2015			2014
Service Cost	$	9.4		$	8.2		$	18.9		$	16.4
Interest Cost		11.2			11.1			22.4			22.2
Expected Return on Plan Assets		(24.1	)		(24.5	)		(48.2	)		(48.9	)
Amortization
Net Actuarial Loss		7.4			5.3			14.8			10.7
Prior Service Cost		(0.1	)		(0.1	)		(0.2	)		(0.2	)
Net Periodic Pension Expense	$	3.8		$	—		$	7.7		$	0.2

Net Periodic Pension Expense (Benefit) Non U.S. Plans	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2015			2014			2015			2014
Interest Cost	$	1.4		$	1.8		$	2.8		$	3.5
Expected Return on Plan Assets		(1.4	)		(1.8	)		(2.9	)		(3.5	)
Net Actuarial Loss Amortization		0.4			(0.4	)		0.8			(0.8	)
Net Periodic Pension Expense (Benefit)	$	0.4		$	(0.4	)	$	0.7		$	(0.8	)

Net Periodic Pension Expense Supplemental Plan	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Service Cost	$	0.9	$	0.7	$	1.8	$	1.5
Interest Cost		1.2		1.2		2.5		2.4
Amortization
Net Actuarial Loss		1.9		1.4		3.7		2.9
Prior Service Cost		0.1		0.1		0.1		0.2
Net Periodic Pension Expense	$	4.1	$	3.4	$	8.1	$	7.0

Net Periodic Postretirement Expense (Benefit) Postretirement Health Care Plan	Three Months Ended June 30,					Six Months Ended June 30,
(In Millions)	2015		2014			2015		2014
Service Cost	$	0.1	$	0.1		$	0.1	$	0.1
Interest Cost		0.4		0.3			0.7		0.7
Amortization
Net Actuarial (Gain)		—		(0.2	)		—		(0.3	)
Net Periodic Postretirement Expense (Benefit)	$	0.5	$	0.2		$	0.8	$	0.5

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Reconciliation of Amortized Cost to Fair Values of Securities Held to Maturity (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 6,990.8	$ 4,170.8
Gross Unrealized Gains	21.2	26.4
Gross Unrealized Losses	25.6	21.1
Fair Value	6,986.4	4,176.1
Obligations of States and Political Subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	103.4	121.9
Gross Unrealized Gains	5.9	7.4
Fair Value	109.3	129.3
U.S. Government Sponsored Agency
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	11.5	18.4
Gross Unrealized Gains	0.9	1.1
Fair Value	12.4	19.5
Covered Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	125.9
Gross Unrealized Gains	0.1
Fair Value	126.0
Non-U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,363.9	1,281.6
Gross Unrealized Gains	6.2	6.6
Gross Unrealized Losses	0.4	0.4
Fair Value	1,369.7	1,287.8
Certificates of Deposit
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	3,036.8	924.3
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	0.6	0.1
Fair Value	3,036.3	924.3
Sub-Sovereign, Supranational and Non US Agency Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,266.4
Gross Unrealized Gains	8.0
Gross Unrealized Losses	0.8
Fair Value	2,273.6
Others
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	82.9	78.8
Gross Unrealized Gains		0.3
Gross Unrealized Losses	23.8	20.1
Fair Value	$ 59.1	59.0
Supranational and Non-U.S. Agency Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost		1,745.8
Gross Unrealized Gains		10.9
Gross Unrealized Losses		0.5
Fair Value		$ 1,756.2

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Earnings Contribution of Northern Trust's Reporting Segments (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014		Jun. 30, 2015		Jun. 30, 2014
Segment Reporting Information [Line Items]
Trust, Investment and Other Servicing Fees	$ 756.8		$ 706.9		$ 1,484.3		$ 1,386.4
Foreign Exchange Trading Income	74.8		52.9		146.4		103.0
Other Noninterest Income	173.1		75.3		247.9		140.5
Net Interest Income (FTE)	257.6	[1]	253.4	[1]	524.4	[2]	507.8	[2]
Revenue	1,262.3	[1]	1,088.5	[1]	2,403.0	[2]	2,137.7	[2]
Provision for Credit Losses	(10.0)				(14.5)		3.0
Noninterest Expense	854.5		811.0		1,643.5		1,579.0
Income before Income Taxes	417.8	[1]	277.5	[1]	774.0	[2]	555.7	[2]
Provision for Income Taxes	148.6	[1]	95.6	[1]	274.1	[2]	192.4	[2]
Net Income	$ 269.2		$ 181.9		$ 499.9		$ 363.3
Percentage of Consolidated Net Income	100.00%		100.00%		100.00%		100.00%
Average Assets	$ 111,691.1		$ 103,324.1		$ 109,613.7		$ 101,792.3
Corporate & Institutional Services
Segment Reporting Information [Line Items]
Trust, Investment and Other Servicing Fees	432.0		395.4		839.3		774.6
Foreign Exchange Trading Income	71.8		50.7		139.3		98.8
Other Noninterest Income	43.2		47.1		85.1		91.5
Net Interest Income (FTE)	92.7	[1]	76.7	[1]	188.7	[2]	150.4	[2]
Revenue	639.7	[1]	569.9	[1]	1,252.4	[2]	1,115.3	[2]
Provision for Credit Losses	2.0		2.4		(0.2)		3.6
Noninterest Expense	488.2		446.4		923.1		869.9
Income before Income Taxes	149.5	[1]	121.1	[1]	329.5	[2]	241.8	[2]
Provision for Income Taxes	45.3	[1]	36.1	[1]	102.6	[2]	70.9	[2]
Net Income	$ 104.2		$ 85.0		$ 226.9		$ 170.9
Percentage of Consolidated Net Income	39.00%		47.00%		45.00%		47.00%
Average Assets	$ 43,299.8		$ 59,995.2		$ 41,540.9		$ 58,631.4
Wealth Management
Segment Reporting Information [Line Items]
Trust, Investment and Other Servicing Fees	324.8		311.5		645.0		611.8
Foreign Exchange Trading Income	3.0		2.2		7.1		4.2
Other Noninterest Income	26.8		23.1		55.6		45.8
Net Interest Income (FTE)	141.0	[1]	132.6	[1]	279.3	[2]	267.6	[2]
Revenue	495.6	[1]	469.4	[1]	987.0	[2]	929.4	[2]
Provision for Credit Losses	(12.0)		(2.4)		(14.3)		(0.6)
Noninterest Expense	322.7		329.4		644.6		648.2
Income before Income Taxes	184.9	[1]	142.4	[1]	356.7	[2]	281.8	[2]
Provision for Income Taxes	69.6	[1]	53.6	[1]	134.2	[2]	106.2	[2]
Net Income	$ 115.3		$ 88.8		$ 222.5		$ 175.6
Percentage of Consolidated Net Income	43.00%		49.00%		45.00%		48.00%
Average Assets	$ 24,826.5		$ 22,210.8		$ 24,569.1		$ 22,368.8
Treasury and Other
Segment Reporting Information [Line Items]
Other Noninterest Income	103.1		5.1		107.2		3.2
Net Interest Income (FTE)	23.9	[1]	44.1	[1]	56.4	[2]	89.8	[2]
Revenue	127.0	[1]	49.2	[1]	163.6	[2]	93.0	[2]
Noninterest Expense	43.6		35.2		75.8		60.9
Income before Income Taxes	83.4	[1]	14.0	[1]	87.8	[2]	32.1	[2]
Provision for Income Taxes	33.7	[1]	5.9	[1]	37.3	[2]	15.3	[2]
Net Income	$ 49.7		$ 8.1		$ 50.5		$ 16.8
Percentage of Consolidated Net Income	18.00%		4.00%		10.00%		5.00%
Average Assets	$ 43,564.8		$ 21,118.1		$ 43,503.7		$ 20,792.1

[1] Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $6.4 million for 2015 and $6.8 million for 2014.

[2] Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $12.6 million for 2015 and $15.5 million for 2014.

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Consolidated Balance Sheet - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Assets
Cash and Due from Banks	$ 7,152.9	$ 3,050.6
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,020.0	1,062.7
Interest-Bearing Deposits with Banks	15,650.3	14,928.3
Federal Reserve Deposits	17,488.7	17,386.3
Securities
Available for Sale	31,835.6	29,558.5
Held to Maturity (Fair value of $6,986.4 and $4,176.1)	6,990.8	4,170.8
Trading Account	1.2	4.7
Total Securities	38,827.6	33,734.0
Loans and Leases
Commercial	15,304.9	14,353.6
Personal	17,648.9	17,286.6
Total Loans and Leases	32,953.8	31,640.2
Allowance for Credit Losses Assigned to Loans and Leases	(257.3)	(267.0)
Buildings and Equipment	436.5	444.3
Client Security Settlement Receivables	2,034.2	1,568.8
Goodwill	534.3	533.2
Other Assets	4,101.9	5,865.1
Total Assets	119,942.9	109,946.5
Deposits
Demand and Other Noninterest-Bearing	25,688.8	22,815.0
Savings and Money Market	15,782.4	15,916.4
Savings Certificates and Other Time	1,540.5	1,757.4
Non U.S. Offices - Noninterest-Bearing	4,766.3	2,723.2
Non U.S. Offices - Interest-Bearing	52,909.9	47,545.0
Total Deposits	100,687.9	90,757.0
Federal Funds Purchased	351.3	932.9
Securities Sold under Agreements to Repurchase	29.8	885.1
Other Borrowings	3,322.9	1,685.2
Senior Notes	1,497.2	1,497.0
Long-Term Debt	1,362.3	1,615.1
Floating Rate Capital Debt	277.3	277.2
Other Liabilities	3,664.9	3,848.1
Total Liabilities	111,193.6	101,497.6
Stockholders' Equity
Preferred Stock, No Par Value; Authorized 10,000,000 shares: Series C, outstanding shares of 16,000	388.5	388.5
Common Stock, $1.66 2/3 Par Value; Authorized 560,000,000 shares; Outstanding shares of 232,852,813 and 233,390,705	408.6	408.6
Additional Paid-In Capital	1,044.6	1,050.9
Retained Earnings	7,949.8	7,625.4
Accumulated Other Comprehensive Loss	(273.7)	(319.7)
Treasury Stock (12,318,711 and 11,780,819 shares, at cost)	(768.5)	(704.8)
Total Stockholders' Equity	8,749.3	8,448.9
Total Liabilities and Stockholders' Equity	$ 119,942.9	$ 109,946.5

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Valuation Techniques, Significant Unobservable Inputs, and Quantitative Information (Detail) - Jun. 30, 2015 - Fair Value, Measurements, Recurring - Fair Value, Inputs, Level 3 - USD ($) $ in Millions	Total
Swap Related to Sale of Certain Visa Class B Common Shares
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instrument, fair value liabilities	$ 11.3
Swap Related to Sale of Certain Visa Class B Common Shares | Group One
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Discounted Cash Flow
Unobservable Inputs	Visa Class A Appreciation
Swap Related to Sale of Certain Visa Class B Common Shares | Group Two
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Discounted Cash Flow
Unobservable Inputs	Conversion Rate
Swap Related to Sale of Certain Visa Class B Common Shares | Group Three
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Discounted Cash Flow
Unobservable Inputs	Expected Conversion Rate
Swap Related to Sale of Certain Visa Class B Common Shares | Lower Limit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instrument Visa Class A Appreciation	10.00%
Financial instrument Conversion Rate	1.61%
Financial instrument Expected Conversion Rate	2 years
Swap Related to Sale of Certain Visa Class B Common Shares | Upper Limit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instrument Visa Class A Appreciation	15.00%
Financial instrument Conversion Rate	1.65%
Financial instrument Expected Conversion Rate	5 years
Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial Instrument, fair value assets	$ 16.6
Auction Rate Securities | Group One
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Discounted Cash Flow
Unobservable Inputs	Remaining lives
Auction Rate Securities | Group Two
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Valuation Technique	Discounted Cash Flow
Unobservable Inputs	Discount rates
Auction Rate Securities | Lower Limit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instrument remaining lives	10 months 24 days
Financial instrument discount rate	0.10%
Auction Rate Securities | Upper Limit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financial instrument remaining lives	8 years 7 months 6 days
Financial instrument discount rate	8.10%

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Offsetting of Derivative Assets and of Securities Purchased Under Agreements to Resell Within Consolidated Balance Sheets (Detail) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Securities Purchased under Agreements to Resell
Derivative [Line Items]
Gross Recognized Assets	[1]	$ 1,000.0	$ 1,000.0
Net Amounts Presented	[1]	1,000.0	1,000.0
Gross Amounts Not Offset	[1]	1,000.0	1,000.0
Derivatives
Derivative [Line Items]
Gross Recognized Assets	[2]	2,686.3	4,507.5
Gross Amounts Offset	[2]	1,698.0	2,257.1
Net Amounts Presented	[2]	988.3	2,250.4
Net Amount	[2],[3]	988.3	2,250.4
Derivatives | Subject to Master Netting Arrangement
Derivative [Line Items]
Gross Recognized Assets	[2]	2,297.6	3,675.1
Gross Amounts Offset	[2]	1,698.0	2,257.1
Net Amounts Presented	[2]	599.6	1,418.0
Net Amount	[2],[3]	599.6	1,418.0
Derivatives | Not Subject to Master Netting Arrangement
Derivative [Line Items]
Gross Recognized Assets	[2]	388.7	832.4
Net Amounts Presented	[2]	388.7	832.4
Net Amount	[2],[3]	388.7	832.4
Derivatives | Foreign Exchange Contracts | Over the Counter Derivative
Derivative [Line Items]
Gross Recognized Assets	[2]	2,093.4	3,442.8
Gross Amounts Offset	[2]	1,232.9	1,889.8
Net Amounts Presented	[2]	860.5	1,553.0
Net Amount	[2],[3]	860.5	1,553.0
Derivatives | Interest Rate Swaps | Over the Counter Derivative
Derivative [Line Items]
Gross Recognized Assets	[2]	167.8	183.9
Gross Amounts Offset	[2]	30.3	32.1
Net Amounts Presented	[2]	137.5	151.8
Net Amount	[2],[3]	137.5	151.8
Derivatives | Interest Rate Swaps | Exchange Cleared
Derivative [Line Items]
Gross Recognized Assets	[2]	36.4	48.4
Gross Amounts Offset	[2]	19.2	13.1
Net Amounts Presented	[2]	17.2	35.3
Net Amount	[2],[3]	17.2	35.3
Derivatives | Cross Product Netting Adjustment
Derivative [Line Items]
Gross Amounts Offset	[2]	27.7	6.3
Derivatives | Cross Product Collateral Adjustment
Derivative [Line Items]
Gross Amounts Offset	[2]	$ 387.9	$ 315.8

[1] Securities purchased under agreements to resell are reported in federal funds sold and securities purchased under agreements to resell in the consolidated balance sheets. Federal funds sold totaled $20.0 million and $62.7 million as of June 30, 2015, and December 31, 2014, respectively.

[2] Derivative assets are reported in other assets in the consolidated balance sheets. Other assets (excluding derivative assets) totaled $3,113.6 million and $3,614.7 million as of June 30, 2015, and December 31, 2014, respectively.

[3] 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 June 30, 2015, and December 31, 2014.

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Consolidated Statement of Income (Parenthetical) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Changes in Other-Than-Temporary-Impairment (OTTI) Losses	[1]				$ (4.6)
Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI	[2]				0.7
Other Security Gains (Losses), net		$ (0.4)	$ 0.4	$ (0.3)	0.3
Investment Security Gains (Losses), net	[3]	$ (0.4)	$ 0.4	$ (0.3)	$ (3.6)

[1] For initial OTTI in the applicable period, the balance includes the excess of the amortized cost over the fair value of the impaired securities. For subsequent impairments of the same security, the balance includes any additional changes in fair value of the security subsequent to its most recently recorded OTTI.

[2] For initial OTTI in the applicable period, the balance includes the portion of the excess of amortized cost over the fair value of the impaired securities that was recorded in other comprehensive income (OCI). For subsequent impairments of the same security, the balance includes additional changes in OCI for that security subsequent to its most recently recorded OTTI.

[3] Changes in Other-Than-Temporary-Impairment (OTTI) Losses $ - $ - $ - $ (4.6 ) Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI - - - 0.7 Other Security Gains (Losses), net (0.4 ) 0.4 (0.3 ) 0.3 Investment Security Gains (Losses), net $ (0.4 ) $ 0.4 $ (0.3 ) $ (3.6 )

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Types of Risk Management Derivative Instruments Not Formally Designated as Hedges and Their Notional Amounts and Fair Values (Detail) - Nondesignated - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Value		$ 316.3	$ 246.3
Fair Value Asset		1.0	0.8
Fair Value Liability		12.0	5.3
Foreign Exchange Contracts
Derivative [Line Items]
Notional Value		205.6	246.3
Fair Value Asset		1.0	0.8
Fair Value Liability		0.7	$ 5.3
Other Financial Derivatives
Derivative [Line Items]
Notional Value	[1]	110.7
Fair Value Liability	[1]	$ 11.3

[1] This line includes a swap related to the sale of certain Visa Class B common shares.

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Repurchase Agreements Accounted for as Secured Borrowings (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Gross Amount of Recognized Liabilities for Repurchase Agreements in footnote 21	$ 151.7	$ 1,200.0
Amounts related to agreements not included in footnote 21	41.5	$ 153.2
Overnight and Continuous
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Borrowings	29.8
Gross Amount of Recognized Liabilities for Repurchase Agreements in footnote 21	29.8
Amounts related to agreements not included in footnote 21	0.0
Overnight and Continuous | U.S. Treasury and Agency Securities
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total Borrowings	$ 29.8

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Offsetting of Derivative Liabilities and of Securities Sold Under Agreements to Repurchase Within Consolidated Balance Sheet (Parenthetical) (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Other liabilities	$ 2,519,500,000	$ 2,794,100,000
Cash collateral placed that was not offset	$ 0	$ 0

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Goodwill and Other Intangibles (Tables)

6 Months Ended

Jun. 30, 2015

Changes by Reporting Segment in Carrying Amounts of Goodwill, including Effect of Foreign Exchange Rates on Non-U.S.-Dollar-Denominated Balances

The carrying amounts of goodwill, reflecting the effect of foreign exchange rates on non-U.S.-dollar-denominated balances, by reporting segment at June 30, 2015, and December 31, 2014, were as follows:

Table 48: Goodwill by Reporting Segment

(In Millions)	June 30, 2015		December 31, 2014
Corporate & Institutional Services	$	462.9	$	461.8
Wealth Management		71.4		71.4
Total Goodwill	$	534.3	$	533.2

Other Intangible Assets Subject to Amortization

The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of June 30, 2015, and December 31, 2014, were as follows:

Table 49: Other Intangible Assets

(In Millions)	June 30, 2015		December 31, 2014
Gross Carrying Amount	$	186.9	$	189.5
Less: Accumulated Amortization		135.7		129.5
Net Book Value	$	51.2	$	60.0

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Number of Loans and Leases Modified in TDRs and Total Recorded Investments and Unpaid Principal Balances (Detail) - Class of Financing Receivable $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Contract	Jun. 30, 2014 USD ($) Contract	Jun. 30, 2015 USD ($) Contract	Jun. 30, 2014 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	21	38	80	74
Recorded Investment	$ 9.2	$ 5.9	$ 17.1	$ 10.1
Unpaid Principal Balance	$ 10.1	$ 7.0	$ 21.1	$ 11.4
Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	1	2	3	3
Recorded Investment	$ 0.1	$ 0.7	$ 0.9	$ 1.4
Unpaid Principal Balance	$ 0.1	$ 1.0	$ 0.9	$ 1.7
Commercial | Commercial and Institutional
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	1	2	2	2
Recorded Investment	$ 0.1	$ 0.7	$ 0.1	$ 0.7
Unpaid Principal Balance	$ 0.1	$ 1.0	$ 0.1	$ 1.0
Commercial | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract			1	1
Recorded Investment			$ 0.8	$ 0.7
Unpaid Principal Balance			$ 0.8	$ 0.7
Personal
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	20	36	77	71
Recorded Investment	$ 9.1	$ 5.2	$ 16.2	$ 8.7
Unpaid Principal Balance	$ 10.0	$ 6.0	$ 20.2	$ 9.7
Personal | Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	19	34	76	68
Recorded Investment	$ 8.5	$ 4.9	$ 15.6	$ 8.4
Unpaid Principal Balance	$ 9.4	$ 5.7	$ 19.6	$ 9.4
Personal | Private Client
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases | Contract	1	2	1	3
Recorded Investment	$ 0.6	$ 0.3	$ 0.6	$ 0.3
Unpaid Principal Balance	$ 0.6	$ 0.3	$ 0.6	$ 0.3

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Net Interest Income

6 Months Ended

Jun. 30, 2015

Net Interest Income

14. Net Interest Income — The components of net interest income were as follows:

Table 55: Net Interest Income

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Interest Income
Loans and Leases	$	171.0	$	185.8	$	354.9	$	368.7
Securities — Taxable		77.2		63.5		153.7		132.9
— Non-Taxable		1.2		1.8		2.6		4.1
Interest-Bearing Deposits with Banks		28.7		33.6		55.3		65.7
Federal Reserve Deposits and Other		10.7		9.1		21.1		17.8
Total Interest Income		288.8		293.8		587.6		589.2
Interest Expense
Deposits		18.4		22.4		35.1		42.5
Federal Funds Purchased		0.1		0.3		0.3		0.6
Securities Sold Under Agreements to Repurchase		0.1		0.1		0.2		0.2
Other Borrowings		1.1		0.8		2.3		1.5
Senior Notes		11.9		13.7		23.5		31.2
Long-Term Debt		5.5		9.4		13.3		19.8
Floating Rate Capital Debt		0.5		0.5		1.1		1.1
Total Interest Expense		37.6		47.2		75.8		96.9
Net Interest Income	$	251.2	$	246.6	$	511.8	$	492.3

Note: Interest income for the three and six months ended June 30, 2015, was earned on cash and due from banks of $1.1 billion and $3.3 billion, respectively, and interest-bearing deposits with banks of $15.7 billion as of June 30, 2015.

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Reporting Segments (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Contribution of Northern Trust's Reporting Segments

The following tables show the earnings contributions of Northern Trust’s reporting segments for the three- and six-month periods ended June 30, 2015 and 2014.

Table 50: Results of Reporting Segments

Three Months Ended June 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2015			2014			2015			2014			2015			2014			2015			2014
Noninterest Income
Trust, Investment and Other Servicing Fees	$	432.0		$	395.4		$	324.8		$	311.5		$	—		$	—		$	756.8		$	706.9
Foreign Exchange Trading Income		71.8			50.7			3.0			2.2			—			—			74.8			52.9
Other Noninterest Income		43.2			47.1			26.8			23.1			103.1			5.1			173.1			75.3
Net Interest Income (FTE)*		92.7			76.7			141.0			132.6			23.9			44.1			257.6			253.4
Revenue*		639.7			569.9			495.6			469.4			127.0			49.2			1,262.3			1,088.5
Provision for Credit Losses		2.0			2.4			(12.0	)		(2.4	)		—			—			(10.0	)		—
Noninterest Expense		488.2			446.4			322.7			329.4			43.6			35.2			854.5			811.0
Income before
Income Taxes*		149.5			121.1			184.9			142.4			83.4			14.0			417.8			277.5
Provision for
Income Taxes*		45.3			36.1			69.6			53.6			33.7			5.9			148.6			95.6
Net Income	$	104.2		$	85.0		$	115.3		$	88.8		$	49.7		$	8.1		$	269.2		$	181.9
Percentage of
Consolidated Net Income		39	%		47	%		43	%		49	%		18	%		4	%		100	%		100	%
Average Assets	$	43,299.8		$	59,995.2		$	24,826.5		$	22,210.8		$	43,564.8		$	21,118.1		$	111,691.1		$	103,324.1

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $6.4 million for 2015 and $6.8 million for 2014.

Six Months Ended June 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2015			2014			2015			2014			2015			2014			2015			2014
Noninterest Income
Trust, Investment and Other Servicing Fees	$	839.3		$	774.6		$	645.0		$	611.8		$	—		$	—		$	1,484.3		$	1,386.4
Foreign Exchange Trading Income		139.3			98.8			7.1			4.2			—			—			146.4			103.0
Other Noninterest Income		85.1			91.5			55.6			45.8			107.2			3.2			247.9			140.5
Net Interest Income (FTE)*		188.7			150.4			279.3			267.6			56.4			89.8			524.4			507.8
Revenue*		1,252.4			1,115.3			987.0			929.4			163.6			93.0			2,403.0			2,137.7
Provision for Credit Losses		(0.2	)		3.6			(14.3	)		(0.6	)		—			—			(14.5	)		3.0
Noninterest Expense		923.1			869.9			644.6			648.2			75.8			60.9			1,643.5			1,579.0
Income before
Income Taxes*		329.5			241.8			356.7			281.8			87.8			32.1			774.0			555.7
Provision for
Income Taxes*		102.6			70.9			134.2			106.2			37.3			15.3			274.1			192.4
Net Income	$	226.9		$	170.9		$	222.5		$	175.6		$	50.5		$	16.8		$	499.9		$	363.3
Percentage of
Consolidated Net Income		45	%		47	%		45	%		48	%		10	%		5	%		100	%		100	%
Average Assets	$	41,540.9		$	58,631.4		$	24,569.1		$	22,368.8			43,503.7			20,792.1		$	109,613.7		$	101,792.3

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $12.6 million for 2015 and $15.5 million for 2014.

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Offsetting of Derivative Liabilities and of Securities Sold Under Agreements to Repurchase Within Consolidated Balance Sheet (Detail) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Net Amounts Presented		$ 29.8	$ 885.1
Securities Sold under Agreements to Repurchase
Derivative [Line Items]
Gross Recognized Liabilities		29.8	885.1
Net Amounts Presented		29.8	885.1
Gross Amounts Not Offset		29.8	885.1
Derivatives
Derivative [Line Items]
Gross Recognized Liabilities	[1]	2,607.2	4,227.3
Gross Amounts Offset	[1]	1,461.8	3,173.3
Net Amounts Presented	[1]	1,145.4	1,054.0
Net Amount	[1],[2]	1,145.4	1,054.0
Derivatives | Subject to Master Netting Arrangement
Derivative [Line Items]
Gross Recognized Liabilities	[1]	1,702.3	3,562.8
Gross Amounts Offset	[1]	1,461.8	3,173.3
Net Amounts Presented	[1]	240.5	389.5
Net Amount	[1],[2]	240.5	389.5
Derivatives | Not Subject to Master Netting Arrangement
Derivative [Line Items]
Gross Recognized Liabilities	[1]	904.9	664.5
Net Amounts Presented	[1]	904.9	664.5
Net Amount	[1],[2]	904.9	664.5
Derivatives | Foreign Exchange Contracts | Over the Counter Derivative
Derivative [Line Items]
Gross Recognized Liabilities	[1]	1,570.5	3,431.0
Gross Amounts Offset	[1]	1,232.9	1,889.8
Net Amounts Presented	[1]	337.6	1,541.2
Net Amount	[1],[2]	337.6	1,541.2
Derivatives | Interest Rate Swaps | Over the Counter Derivative
Derivative [Line Items]
Gross Recognized Liabilities	[1]	101.3	118.7
Gross Amounts Offset	[1]	30.3	32.1
Net Amounts Presented	[1]	71.0	86.6
Net Amount	[1],[2]	71.0	86.6
Derivatives | Interest Rate Swaps | Exchange Cleared
Derivative [Line Items]
Gross Recognized Liabilities	[1]	19.2	13.1
Gross Amounts Offset	[1]	19.2	13.1
Derivatives | Other Financial Derivatives
Derivative [Line Items]
Gross Recognized Liabilities	[1]	11.3
Net Amounts Presented	[1]	11.3
Net Amount	[1],[2]	11.3
Derivatives | Cross Product Netting Adjustment
Derivative [Line Items]
Gross Amounts Offset	[1]	27.7	6.3
Derivatives | Cross Product Collateral Adjustment
Derivative [Line Items]
Gross Amounts Offset	[1]	$ 151.7	$ 1,232.0

[1] Derivative liabilities are reported in other liabilities in the consolidated balance sheets. Other liabilities (excluding derivative liabilities) totaled $2,519.5 million and $2,794.1 million as of June 30, 2015, and December 31, 2014, respectively.

[2] 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 June 30, 2015, and December 31, 2014.

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Pension and Postretirement Health Care

6 Months Ended

Jun. 30, 2015

Pension and Postretirement Health Care

16. Pension and Postretirement Health Care — The following tables set forth the net periodic pension and postretirement benefit expense for Northern Trust’s U.S. and non-U.S. pension plans, supplemental pension plan, and postretirement health care plan for the three and six months ended June 30, 2015 and 2014.

Table 56: Net Periodic Pension Expense (Benefit)

Net Periodic Pension Expense U.S. Plan	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2015			2014			2015			2014
Service Cost	$	9.4		$	8.2		$	18.9		$	16.4
Interest Cost		11.2			11.1			22.4			22.2
Expected Return on Plan Assets		(24.1	)		(24.5	)		(48.2	)		(48.9	)
Amortization
Net Actuarial Loss		7.4			5.3			14.8			10.7
Prior Service Cost		(0.1	)		(0.1	)		(0.2	)		(0.2	)
Net Periodic Pension Expense	$	3.8		$	—		$	7.7		$	0.2

Net Periodic Pension Expense (Benefit) Non U.S. Plans	Three Months Ended June 30,						Six Months Ended June 30,
(In Millions)	2015			2014			2015			2014
Interest Cost	$	1.4		$	1.8		$	2.8		$	3.5
Expected Return on Plan Assets		(1.4	)		(1.8	)		(2.9	)		(3.5	)
Net Actuarial Loss Amortization		0.4			(0.4	)		0.8			(0.8	)
Net Periodic Pension Expense (Benefit)	$	0.4		$	(0.4	)	$	0.7		$	(0.8	)

Net Periodic Pension Expense Supplemental Plan	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Service Cost	$	0.9	$	0.7	$	1.8	$	1.5
Interest Cost		1.2		1.2		2.5		2.4
Amortization
Net Actuarial Loss		1.9		1.4		3.7		2.9
Prior Service Cost		0.1		0.1		0.1		0.2
Net Periodic Pension Expense	$	4.1	$	3.4	$	8.1	$	7.0

Net Periodic Postretirement Expense (Benefit) Postretirement Health Care Plan	Three Months Ended June 30,					Six Months Ended June 30,
(In Millions)	2015		2014			2015		2014
Service Cost	$	0.1	$	0.1		$	0.1	$	0.1
Interest Cost		0.4		0.3			0.7		0.7
Amortization
Net Actuarial (Gain)		—		(0.2	)		—		(0.3	)
Net Periodic Postretirement Expense (Benefit)	$	0.5	$	0.2		$	0.8	$	0.5

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Pledged Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	$ 32,900,000,000		$ 32,900,000,000		$ 32,300,000,000
Fair value of accepted collateral	1,000,000,000		1,000,000,000		1,000,000,000
Amount of securities repledged or sold collateral	0		0		0
Average deposits maintained to meet Federal Reserve Bank reserve requirements	1,700,000,000	$ 1,300,000,000	1,600,000,000	$ 1,200,000,000
Us Government Agencies Debt Securities And Other Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	23,700,000,000		23,700,000,000		23,100,000,000
Obligations of States and Political Subdivisions
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	103,900,000		103,900,000		122,900,000
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	9,100,000,000		9,100,000,000		9,100,000,000
Collateral Requirements
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	5,100,000,000		5,100,000,000		5,900,000,000
Available for Sale Investment Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	$ 17,900,000		$ 17,900,000		$ 884,800,000

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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Millions	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Balance at Dec. 31, 2013			$ 408.6	$ 1,035.7	$ 7,134.8	$ (244.3)	$ (422.8)
Net Unrealized Gains (Losses) on Securities Available for Sale	$ 38.0					38.0
Stock Options and Awards				(47.1)			116.5
Net Income	363.3				363.3
Issuance of Preferred Stock, Series C		$ 0.0
Net Unrealized Gains (Losses) on Cash Flow Hedges	1.0					1.0
Stock Options and Awards - Amortization				42.1
Dividends Declared - Common Stock					(154.0)
Stock Purchased							(237.9)
Foreign Currency Translation Adjustments	(6.9)					(6.9)
Stock Options and Awards - Tax Benefits				8.6
Pension and Other Postretirement Benefit Adjustments	7.0					7.0
Balance at Jun. 30, 2014	8,042.6		408.6	1,039.3	7,344.1	(205.2)	(544.2)
Balance at Dec. 31, 2014	8,448.9	388.5	408.6	1,050.9	7,625.4	(319.7)	(704.8)
Net Unrealized Gains (Losses) on Securities Available for Sale	31.7					31.7
Stock Options and Awards				(64.3)			140.2
Net Income	499.9				499.9
Issuance of Preferred Stock, Series C		0.0
Net Unrealized Gains (Losses) on Cash Flow Hedges	2.1					2.1
Stock Options and Awards - Amortization				42.6
Dividends Declared - Common Stock					(163.8)
Stock Purchased	(203.9)						(203.9)
Foreign Currency Translation Adjustments	(0.1)					(0.1)
Stock Options and Awards - Tax Benefits				15.4
Dividends Declared - Preferred Stock					(11.7)
Pension and Other Postretirement Benefit Adjustments	12.3					12.3
Balance at Jun. 30, 2015	$ 8,749.3	$ 388.5	$ 408.6	$ 1,044.6	$ 7,949.8	$ (273.7)	$ (768.5)

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Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Held to Maturity, Fair value	$ 6,986.4	$ 4,176.1
Total Loans and Leases, unearned income	$ 255.2	$ 287.7
Preferred Stock, Par Value	$ 0	$ 0
Preferred Stock, Authorized	10,000,000	10,000,000
Preferred Stock, Outstanding	16,000	16,000
Common Stock, Par Value	$ 1.6667	$ 1.6667
Common Stock, Authorized	560,000,000	560,000,000
Common Stock, Outstanding	232,852,813	233,390,705
Treasury Stock, shares	12,318,711	11,780,819

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Goodwill and Other Intangibles

6 Months Ended

Jun. 30, 2015

Goodwill and Other Intangibles

9. Goodwill and Other Intangibles — The carrying amounts of goodwill, reflecting the effect of foreign exchange rates on non-U.S.-dollar-denominated balances, by reporting segment at June 30, 2015, and December 31, 2014, were as follows:

Table 48: Goodwill by Reporting Segment

(In Millions)	June 30, 2015		December 31, 2014
Corporate & Institutional Services	$	462.9	$	461.8
Wealth Management		71.4		71.4
Total Goodwill	$	534.3	$	533.2

The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of June 30, 2015, and December 31, 2014, were as follows:

Table 49: Other Intangible Assets

(In Millions)	June 30, 2015		December 31, 2014
Gross Carrying Amount	$	186.9	$	189.5
Less: Accumulated Amortization		135.7		129.5
Net Book Value	$	51.2	$	60.0

Other intangible assets consist primarily of the value of acquired client relationships and are included within other assets in the consolidated balance sheets. Amortization expense related to other intangible assets totaled $2.1 million and $6.7 million for the three and six months ended June 30, 2015, respectively, and $5.0 million and $9.9 million for the three and six months ended June 30, 2014, respectively. Amortization for the remainder of 2015 and for the years 2016, 2017, 2018, and 2019 is estimated to be $4.2 million, $8.5 million, $8.4 million, $7.8 million and $7.6 million, respectively.

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Net Investment Hedge Gains and Losses Recognized in AOCI (Detail) - Net Investment Hedges - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative [Line Items]
Hedging Instrument Gain/(Loss) Recognized in AOCI (Before Tax)	$ (81.1)	$ (29.6)	$ 35.5	$ (40.2)
Foreign Exchange Contracts
Derivative [Line Items]
Hedging Instrument Gain/(Loss) Recognized in AOCI (Before Tax)	$ (81.1)	(22.9)	30.5	(31.9)
Sterling Denominated Subordinated Debt
Derivative [Line Items]
Hedging Instrument Gain/(Loss) Recognized in AOCI (Before Tax)		$ (6.7)	$ 5.0	$ (8.3)

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Gains and Losses Recorded in Consolidated Statements of Income Related to Fair Value Hedges (Detail) - Asset And Liability Management - FAIR VALUE HEDGES - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ (22.7)	$ 12.8	$ (10.2)	$ 33.2
Available for Sale Investment Securities | Interest Rate Swaps | Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	5.0	(14.9)	(12.3)	(27.0)
Senior Notes and Long- Term Subordinated Debt | Interest Rate Swaps | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ (27.7)	$ 27.7	$ 2.1	$ 60.2

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Document and Entity Information - Jun. 30, 2015 - shares	Total
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Trading Symbol	NTRS
Entity Registrant Name	NORTHERN TRUST CORP
Entity Central Index Key	0000073124
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	232,852,813

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Reporting Segments

6 Months Ended

Jun. 30, 2015

Reporting Segments

10. Reporting Segments — The following tables show the earnings contributions of Northern Trust’s reporting segments for the three- and six-month periods ended June 30, 2015 and 2014.

Table 50: Results of Reporting Segments

Three Months Ended June 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2015			2014			2015			2014			2015			2014			2015			2014
Noninterest Income
Trust, Investment and Other Servicing Fees	$	432.0		$	395.4		$	324.8		$	311.5		$	—		$	—		$	756.8		$	706.9
Foreign Exchange Trading Income		71.8			50.7			3.0			2.2			—			—			74.8			52.9
Other Noninterest Income		43.2			47.1			26.8			23.1			103.1			5.1			173.1			75.3
Net Interest Income (FTE)*		92.7			76.7			141.0			132.6			23.9			44.1			257.6			253.4
Revenue*		639.7			569.9			495.6			469.4			127.0			49.2			1,262.3			1,088.5
Provision for Credit Losses		2.0			2.4			(12.0	)		(2.4	)		—			—			(10.0	)		—
Noninterest Expense		488.2			446.4			322.7			329.4			43.6			35.2			854.5			811.0
Income before
Income Taxes*		149.5			121.1			184.9			142.4			83.4			14.0			417.8			277.5
Provision for
Income Taxes*		45.3			36.1			69.6			53.6			33.7			5.9			148.6			95.6
Net Income	$	104.2		$	85.0		$	115.3		$	88.8		$	49.7		$	8.1		$	269.2		$	181.9
Percentage of
Consolidated Net Income		39	%		47	%		43	%		49	%		18	%		4	%		100	%		100	%
Average Assets	$	43,299.8		$	59,995.2		$	24,826.5		$	22,210.8		$	43,564.8		$	21,118.1		$	111,691.1		$	103,324.1

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $6.4 million for 2015 and $6.8 million for 2014.

Six Months Ended June 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2015			2014			2015			2014			2015			2014			2015			2014
Noninterest Income
Trust, Investment and Other Servicing Fees	$	839.3		$	774.6		$	645.0		$	611.8		$	—		$	—		$	1,484.3		$	1,386.4
Foreign Exchange Trading Income		139.3			98.8			7.1			4.2			—			—			146.4			103.0
Other Noninterest Income		85.1			91.5			55.6			45.8			107.2			3.2			247.9			140.5
Net Interest Income (FTE)*		188.7			150.4			279.3			267.6			56.4			89.8			524.4			507.8
Revenue*		1,252.4			1,115.3			987.0			929.4			163.6			93.0			2,403.0			2,137.7
Provision for Credit Losses		(0.2	)		3.6			(14.3	)		(0.6	)		—			—			(14.5	)		3.0
Noninterest Expense		923.1			869.9			644.6			648.2			75.8			60.9			1,643.5			1,579.0
Income before
Income Taxes*		329.5			241.8			356.7			281.8			87.8			32.1			774.0			555.7
Provision for
Income Taxes*		102.6			70.9			134.2			106.2			37.3			15.3			274.1			192.4
Net Income	$	226.9		$	170.9		$	222.5		$	175.6		$	50.5		$	16.8		$	499.9		$	363.3
Percentage of
Consolidated Net Income		45	%		47	%		45	%		48	%		10	%		5	%		100	%		100	%
Average Assets	$	41,540.9		$	58,631.4		$	24,569.1		$	22,368.8			43,503.7			20,792.1		$	109,613.7		$	101,792.3

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $12.6 million for 2015 and $15.5 million for 2014.

In the six-month period ended June 30, 2015, the presentation of certain assets was changed from C&IS to Treasury and Other to reflect better the internal management responsibility for these assets. In addition to the transfer of assets, the Corporation’s internal funds pricing treatment of deposits that fund the transferred assets was updated to reflect the economics of these deposits.

Further discussion of reporting segment results is provided within the “Reporting Segments” section of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

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Components of Net Interest Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest Income
Loans and Leases	$ 171.0	$ 185.8	$ 354.9	$ 368.7
Securities - Taxable	77.2	63.5	153.7	132.9
Securities - Non-Taxable	1.2	1.8	2.6	4.1
Interest-Bearing Deposits with Banks	28.7	33.6	55.3	65.7
Federal Reserve Deposits and Other	10.7	9.1	21.1	17.8
Total Interest Income	288.8	293.8	587.6	589.2
Interest Expense
Deposits	18.4	22.4	35.1	42.5
Federal Funds Purchased	0.1	0.3	0.3	0.6
Securities Sold Under Agreements to Repurchase	0.1	0.1	0.2	0.2
Other Borrowings	1.1	0.8	2.3	1.5
Senior Notes	11.9	13.7	23.5	31.2
Long-Term Debt	5.5	9.4	13.3	19.8
Floating Rate Capital Debt	0.5	0.5	1.1	1.1
Total Interest Expense	37.6	47.2	75.8	96.9
Net Interest Income	$ 251.2	$ 246.6	$ 511.8	$ 492.3

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Types and Classifications of Derivative Instruments Designated as Hedges (Detail) - Asset And Liability Management - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Value	$ 6,988.9	$ 6,884.8
Fair Value Asset	137.5	251.7
Fair Value Liability	85.4	48.7
FAIR VALUE HEDGES | Senior Notes and Long- Term Subordinated Debt | Interest Rate Swaps
Derivative [Line Items]
Notional Value	1,250.0	1,250.0
Fair Value Asset	93.2	112.8
Fair Value Liability	2.1	2.0
FAIR VALUE HEDGES | Available for Sale Investment Securities | Interest Rate Swaps
Derivative [Line Items]
Notional Value	2,720.4	2,859.5
Fair Value Asset	11.7	12.7
Fair Value Liability	25.3	28.5
CASH FLOW HEDGES | Forecasted Foreign Currency Denominated Transactions | Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	413.4	344.9
Fair Value Asset	6.9	6.0
Fair Value Liability	14.8	14.8
CASH FLOW HEDGES | Available for Sale Investment Securities | Interest Rate Swaps
Derivative [Line Items]
Notional Value	10.0	10.0
CASH FLOW HEDGES | Available for Sale Investment Securities | Interest Rate Option Contracts
Derivative [Line Items]
Notional Value	725.0	625.0
Fair Value Asset	2.8	1.3
Net Investment Hedges | Net Investments in Non-U.S. Affiliates | Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	1,870.1	1,795.4
Fair Value Asset	22.9	118.9
Fair Value Liability	$ 43.2	$ 3.4

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Consolidated Statement of Income - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Noninterest Income
Trust, Investment and Other Servicing Fees		$ 756.8	$ 706.9	$ 1,484.3	$ 1,386.4
Foreign Exchange Trading Income		74.8	52.9	146.4	103.0
Treasury Management Fees		16.1	16.6	32.4	33.4
Security Commissions and Trading Income		20.0	17.8	39.8	32.5
Other Operating Income		137.4	40.5	176.0	78.2
Investment Security Gains (Losses), net	[1]	(0.4)	0.4	(0.3)	(3.6)
Total Noninterest Income		1,004.7	835.1	1,878.6	1,629.9
Net Interest Income
Interest Income		288.8	293.8	587.6	589.2
Interest Expense		37.6	47.2	75.8	96.9
Net Interest Income		251.2	246.6	511.8	492.3
Provision for Credit Losses		(10.0)		(14.5)	3.0
Net Interest Income after Provision for Credit Losses		261.2	246.6	526.3	489.3
Noninterest Expense
Compensation		361.9	372.4	716.2	714.2
Employee Benefits		73.2	68.5	146.1	135.4
Outside Services		147.2	144.6	282.3	289.0
Equipment and Software		114.4	116.1	224.7	217.4
Occupancy		43.0	47.2	86.0	91.4
Other Operating Expense		114.8	62.2	188.2	131.6
Total Noninterest Expense		854.5	811.0	1,643.5	1,579.0
Income before Income Taxes		411.4	270.7	761.4	540.2
Provision for Income Taxes		142.2	88.8	261.5	176.9
Net Income		269.2	181.9	499.9	363.3
Preferred Stock Dividends		5.8		11.7
Net Income Applicable to Common Stock		$ 263.4	$ 181.9	$ 488.2	$ 363.3
Per Common Share
Net Income - Basic		$ 1.11	$ 0.76	$ 2.06	$ 1.51
Net Income - Diluted		$ 1.10	$ 0.75	$ 2.04	$ 1.50
Average Number of Common Shares Outstanding - Basic		233,149,020	236,012,703	233,264,453	236,607,125
Average Number of Common Shares Outstanding - Diluted		235,232,835	237,753,679	235,260,611	238,398,614

[1] Changes in Other-Than-Temporary-Impairment (OTTI) Losses $ - $ - $ - $ (4.6 ) Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI - - - 0.7 Other Security Gains (Losses), net (0.4 ) 0.4 (0.3 ) 0.3 Investment Security Gains (Losses), net $ (0.4 ) $ 0.4 $ (0.3 ) $ (3.6 )

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Securities

6 Months Ended

Jun. 30, 2015

Securities

4. Securities — The following tables provide the amortized cost and fair values of securities at June 30, 2015, and December 31, 2014.

Table 34: Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale

Securities Available for Sale	June 30, 2015
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	4,993.5	$	25.3	$	—	$	5,018.8
Obligations of States and Political Subdivisions		4.5		—		—		4.5
Government Sponsored Agency		16,690.1		91.4		16.1		16,765.4
Non-U.S. Government		310.3		0.7		—		311.0
Corporate Debt		3,749.1		4.8		19.1		3,734.8
Covered Bonds		1,975.5		6.9		0.2		1,982.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		560.0		1.2		0.5		560.7
Other Asset-Backed		3,118.5		1.2		0.5		3,119.2
Auction Rate		16.7		0.5		0.6		16.6
Commercial Mortgage-Backed		198.8		0.1		0.2		198.7
Other		123.5		0.2		—		123.7
Total	$	31,740.5	$	132.3	$	37.2	$	31,835.6

Securities Available for Sale	December 31, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	4,493.5	$	15.1	$	1.7	$	4,506.9
Obligations of States and Political Subdivisions		4.5		0.1		—		4.6
Government Sponsored Agency		16,326.4		82.3		19.5		16,389.2
Non-U.S. Government		309.5		0.9		—		310.4
Corporate Debt		3,617.5		1.8		41.6		3,577.7
Covered Bonds		1,899.9		7.9		0.3		1,907.5
Supranational and Non-U.S. Agency Bonds		360.0		1.5		0.9		360.6
Residential Mortgage-Backed		6.9		—		0.5		6.4
Other Asset-Backed		2,321.8		0.5		1.0		2,321.3
Auction Rate		18.4		0.5		0.8		18.1
Other		155.7		0.3		0.2		155.8
Total	$	29,514.1	$	110.9	$	66.5	$	29,558.5

Table 35: Reconciliation of Amortized Cost to Fair Value of Securities Held to Maturity

Securities Held to Maturity	June 30, 2015
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	103.4	$	5.9	$	—	$	109.3
Government Sponsored Agency		11.5		0.9		—		12.4
Covered Bonds		125.9		0.1		—		126.0
Non-U.S. Government		1,363.9		6.2		0.4		1,369.7
Certificates of Deposit		3,036.8		0.1		0.6		3,036.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		2,266.4		8.0		0.8		2,273.6
Other		82.9		—		23.8		59.1
Total	$	6,990.8	$	21.2	$	25.6	$	6,986.4

Securities Held to Maturity	December 31, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	121.9	$	7.4	$	—	$	129.3
Government Sponsored Agency		18.4		1.1		—		19.5
Non-U.S. Government		1,281.6		6.6		0.4		1,287.8
Certificates of Deposit		924.3		0.1		0.1		924.3
Supranational and Non-U.S. Agency Bonds		1,745.8		10.9		0.5		1,756.2
Other		78.8		0.3		20.1		59.0
Total	$	4,170.8	$	26.4	$	21.1	$	4,176.1

Securities held to maturity consist of debt securities that management intends to, and Northern Trust has the ability to, hold until maturity.

The following table provides the remaining maturity of securities as of June 30, 2015.

Table 36: Remaining Maturity of Securities Available for Sale and Held to Maturity

	June 30, 2015
(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	7,716.2	$	7,738.2
Due After One Year Through Five Years		19,130.6		19,196.1
Due After Five Years Through Ten Years		3,710.9		3,713.9
Due After Ten Years		1,182.8		1,187.4
Total		31,740.5		31,835.6
Held to Maturity
Due in One Year or Less		3,950.0		3,951.8
Due After One Year Through Five Years		2,976.6		2,990.7
Due After Five Years Through Ten Years		20.6		18.4
Due After Ten Years		43.6		25.5
Total	$	6,990.8	$	6,986.4

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

Investment Security Gains and Losses. Net investment security losses of $0.4 million and net investment security gains of $0.4 million were recognized in the three months ended June 30, 2015 and 2014. Gross proceeds from the sale of securities during the three months ended June 30, 2015 of $4.5 million resulted in gross realized losses of $0.4 million. Gross proceeds from the sale of securities during the three months ended June 30, 2014 of $264.2 million resulted in gross realized gains of $0.4 million.

Net investment security losses of $0.3 million were recognized in the six months ended June 30, 2015, representing net realized losses from the sale of securities. Net investment security losses of $3.6 million were recognized in the six months ended June 30, 2014, and included $3.9 million of charges related to the other-than-temporary impairment (OTTI) of certain Community Reinvestment Act (CRA) eligible held to maturity securities. For the six months ended June 30, 2015, proceeds of $106.5 million were received from the sale of securities, resulting in gross realized gains and losses of $0.1 million and $0.4 million, respectively. For the six months ended June 30, 2014, proceeds of $463.9 million were received from the sale of securities, resulting in gross realized gains and losses of $0.7 million and $0.4 million, respectively.

Securities with Unrealized Losses. The following tables provide information regarding securities that had been in a continuous unrealized loss position for less than 12 months and for 12 months or longer as of June 30, 2015, and December 31, 2014.

Table 37: Securities with Unrealized Losses

Securities with Unrealized Losses as of June 30, 2015	Less than 12 Months				12 Months or Longer				Total
(In Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Government Sponsored Agency		3,285.0		8.2		914.3		7.9		4,199.3		16.1
Non-U.S. Government		212.7		0.4		—		—		212.7		0.4
Corporate Debt		943.8		3.8		1,087.0		15.3		2,030.8		19.1
Covered Bonds		154.3		0.2		—		—		154.3		0.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		709.5		1.0		177.4		0.3		886.9		1.3
Other Asset-Backed		1,233.7		0.5		—		—		1,233.7		0.5
Certificates of Deposit		1,878.5		0.6		—		—		1,878.5		0.6
Auction Rate		1.5		0.1		4.6		0.5		6.1		0.6
Commercial Mortgage-Backed		52.5		0.2		—		—		52.5		0.2
Other		16.2		10.8		48.2		13.0		64.4		23.8
Total	$	8,487.7	$	25.8	$	2,231.5	$	37.0	$	10,719.2	$	62.8

Securities with Unrealized Losses as of December 31, 2014	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	$	998.2	$	1.7	$	—	$	—	$	998.2	$	1.7
Government Sponsored Agency		2,344.9		6.6		1,730.0		12.9		4,074.9		19.5
Non-U.S. Government		292.9		0.4		—		—		292.9		0.4
Corporate Debt		1,244.5		3.9		1,338.8		37.7		2,583.3		41.6
Covered Bonds		142.3		0.2		10.0		0.1		152.3		0.3
Supranational and Non-U.S. Agency Bonds		313.2		0.3		175.5		1.1		488.7		1.4
Residential Mortgage-Backed		—		—		4.5		0.5		4.5		0.5
Other Asset-Backed		1,297.6		1.0		—		—		1,297.6		1.0
Certificates of Deposit		438.6		0.1		—		—		438.6		0.1
Auction Rate		2.4		0.2		4.7		0.6		7.1		0.8
Other		27.1		12.1		45.6		8.2		72.7		20.3
Total	$	7,101.7	$	26.5	$	3,309.1	$	61.1	$	10,410.8	$	87.6

As of June 30, 2015, 524 securities with a combined fair value of $10.7 billion were in an unrealized loss position, with their unrealized losses totaling $62.8 million. Unrealized losses of $19.1 million within corporate debt securities primarily reflected higher market rates since purchase; 37% of the corporate debt portfolio is backed by guarantees provided by U.S. and non-U.S. governmental entities. Unrealized losses of $16.1 million related to government sponsored agency securities were primarily attributable to higher market interest rates since purchase.

Securities classified as “other asset-backed” had average lives less than 5 years, and 99.6% were rated triple-A.

The majority of the $23.8 million of unrealized losses in securities classified as “other” at June 30, 2015, related to securities primarily purchased at a premium or par by Northern Trust for compliance with the CRA. Unrealized losses on these CRA-related securities were attributable to yields that are below market rates for the purpose of supporting institutions and programs that benefit low- to moderate- income communities within Northern Trust’s market area. Unrealized losses of $0.6 million related to auction rate securities primarily reflected reduced market liquidity as a majority of auctions continued to fail, preventing holders from liquidating their investments at par. The remaining unrealized losses on Northern Trust’s securities portfolio as of June 30, 2015, were attributable to changes in overall market interest rates, increased credit spreads or reduced market liquidity. As of June 30, 2015, Northern Trust did not intend to sell any investment in an unrealized loss position and it was not more likely than not that Northern Trust would be required to sell any such investment before the recovery of its amortized cost basis, which may be maturity.

Security impairment reviews are conducted quarterly to identify and evaluate securities that have indications of possible OTTI. A determination as to whether a security’s decline in market value is other-than-temporary 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 other-than-temporary include, but are not limited to: the length of time the security has been impaired; 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 it 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 OTTI has occurred.

While all securities are considered, the process for identifying credit impairment within CRA-eligible mortgage-backed securities, the security type for which Northern Trust recognized all of its OTTI in 2014, incorporates an expected loss approach using discounted cash flows on the underlying collateral pools. To evaluate whether an unrealized loss on CRA-eligible mortgage-backed securities is other-than-temporary, a calculation of the security’s present value is made using current pool data, the current delinquency pipeline, default rates and loan loss severities based on the historical performance of like collateral, and Northern Trust’s outlook for the housing market and the overall economy. If the present value of the collateral pools was found to be less than the current amortized cost of the security, a credit-related OTTI loss would be recorded in earnings equal to the difference between the two amounts.

Impairments of CRA-eligible mortgage-backed securities are influenced by a number of factors, including but not limited to, U.S. economic and housing market performance, pool credit enhancement level, year of origination and estimated credit quality of the collateral. The factors used in estimating losses related to CRA-eligible mortgage-backed securities vary by vintage of loan origination and collateral quality.

There were no OTTI losses recognized in the three or six months ended June 30, 2015 or in the three months ended June 30, 2014. There were $3.9 million of OTTI losses recognized during the six months ended June 30, 2014 related to CRA-eligible mortgage-backed securities.

Credit Losses on Debt Securities. The table below provides information regarding total other-than-temporarily impaired securities, including noncredit-related amounts recognized in other comprehensive income and net impairment losses recognized in earnings, for the three and six months ended June 30, 2015 and 2014.

Table 38: Net Impairment Losses Recognized in Earnings

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Changes in OTTI Losses*	$	—	$	—	$	—	$	(4.6	)
Noncredit-related Losses Recorded in / (Reclassified from) OCI**		—		—		—		0.7
Net Impairment Losses Recognized in Earnings	$	—	$	—	$	—	$	(3.9	)

* For initial OTTI in the applicable period, the balance includes the excess of the amortized cost over the fair value of the impaired securities. For subsequent impairments of the same security, the balance includes any additional changes in fair value of the security subsequent to its most recently recorded OTTI.

** For initial OTTI in the applicable period, the balance includes the portion of the excess of amortized cost over the fair value of the impaired securities that was recorded in other comprehensive income (OCI). For subsequent impairments of the same security, the balance includes additional changes in OCI for that security subsequent to its most recently recorded OTTI.

Provided in the table below are the cumulative credit-related losses recognized in earnings on debt securities other-than-temporarily impaired.

Table 39: Cumulative Credit-Related Losses on Securities

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Cumulative Credit-Related Losses on Securities Held — Beginning of Period	$	5.2	$	12.7	$	5.2	$	8.8
Plus: Losses on Newly Identified Impairments		—		—		—		1.8
Additional Losses on Previously Identified Impairments		—		—		—		2.1
Less: Current and Prior Period Losses on Securities Sold During the Period		—		—		—		—
Cumulative Credit-Related Losses on Securities Held — End of Period	$	5.2	$	12.7	$	5.2	$	12.7

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Fair Value Measurements

6 Months Ended

Jun. 30, 2015

Fair Value Measurements

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. Northern Trust’s policy is to recognize transfers into and transfers out of fair value levels as of the end of the reporting period in which the transfer occurred. No transfers between fair value levels occurred during the six months ended June 30, 2015 or the year ended December 31, 2014.

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 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 June 30, 2015, Northern Trust’s available for sale securities portfolio included 975 Level 2 securities with an aggregate market value of $26.8 billion. All 975 securities were valued by external pricing vendors. As of December 31, 2014, Northern Trust’s available for sale securities portfolio included 881 Level 2 securities with an aggregate market value of $25.0 billion. All 881 securities were valued by external pricing vendors. Trading account securities, which totaled $1.2 million and $4.7 million as of June 30, 2015, and December 31, 2014, respectively, were all valued using external pricing vendors.

Northern Trust has established processes and procedures to assess the suitability of valuation methodologies used by external pricing vendors, including reviews of valuation techniques and assumptions used for selected securities. On a daily basis, periodic quality control reviews of prices received from vendors are conducted which include comparisons to prices on similar security types received from multiple pricing vendors and to the previous day’s reported prices for each security. Predetermined tolerance level exceptions are researched and may result in additional validation through available market information or the use of an alternate pricing vendor. Quarterly, Northern Trust reviews documentation from third-party pricing vendors regarding the valuation processes and assumptions used in their valuations and assesses whether the fair value levels assigned by Northern Trust to each security classification are appropriate. Annually, valuation inputs used within third-party pricing vendor valuations are reviewed for propriety on a sample basis through a comparison of inputs used to comparable market data, including security classifications that are less actively traded and security classifications comprising significant portions of the portfolio.

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; 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 assets consist of auction rate securities purchased in 2008 from Northern Trust clients. To estimate the fair value of auction rate securities, for which trading is limited and market prices are generally unavailable, Northern Trust developed and maintains a pricing model that discounts estimated cash flows over their estimated remaining lives. Significant inputs to the model include the contractual terms of the securities, credit risk ratings, discount rates, forward interest rates, credit/liquidity spreads, and Northern Trust’s own assumptions about the estimated remaining lives of the securities. The significant unobservable inputs used in the fair value measurement are Northern Trust’s own assumptions about the estimated remaining lives of the securities and the applicable discount rates. Significant increases (decreases) in the estimated remaining lives or the discount rates in isolation would result in a significantly lower (higher) fair value measurement.

As of June 30, 2015, Northern Trust’s Level 3 liabilities consisted of a swap that Northern Trust entered into with the purchaser of 1.0 million shares of Visa Inc. Class B common stock (Visa Class B common shares) previously held by Northern Trust. Pursuant to the swap, 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 swap also requires 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 swap 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 Shares” under Note 19 — 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.

Management of various businesses and departments of Northern Trust (including Corporate Market Risk, Credit Risk Management, Corporate Financial Management, Corporate & Institutional Services (C&IS) and Wealth Management) determine the valuation policies and procedures for Level 3 assets and liabilities. Generally, valuation policies are reviewed by management of each business or department. Fair value measurements are performed upon acquisitions of an asset or liability. As necessary, the valuation models are reviewed by management of the appropriate business or department, and adjusted for changes in inputs. Management of each business or department reviews the inputs in order to substantiate the unobservable inputs used in each fair value measurement. When appropriate, management reviews forecasts used in the valuation process in light of other relevant financial projections to understand any variances between current and previous fair value measurements. In certain circumstances, third-party information is used to support the fair value measurements. If certain third-party information seems inconsistent with consensus views, a review of the information is performed by management of the respective business or department to conclude as to the appropriate fair value of the asset or liability.

The following presents the fair values of, and the valuation techniques, significant unobservable inputs, and quantitative information used to develop significant unobservable inputs for, Northern Trust’s Level 3 assets and liabilities as of June 30, 2015.

Table 28: Level 3 Significant Unobservable Inputs

Financial Instrument	Fair Value		Valuation Technique	Unobservable Inputs	Range of Lives and Rates
Auction Rate Securities	$	16.6 million	Discounted Cash Flow	Remaining lives Discount rates	0.9 — 8.6 years 0.1% — 8.1%
Swap Related to Sale of Certain Visa Class B Common Shares	$	11.3 million	Discounted Cash Flow	Visa Class A Appreciation Conversion Rate Expected Conversion Rate	10-15% 1.61x — 1.65x 2-5 years

The following tables present assets and liabilities measured at fair value on a recurring basis as of June 30, 2015 and December 31, 2014, segregated by fair value hierarchy level.

Table 29: Recurring Basis Hierarchy Leveling

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
June 30, 2015
Securities
Available for Sale
U.S. Government	$	5,018.8	$	—	$	—	$	—		$	5,018.8
Obligations of States and Political Subdivisions		—		4.5		—		—			4.5
Government Sponsored Agency		—		16,765.4		—		—			16,765.4
Non-U.S. Government		—		311.0		—		—			311.0
Corporate Debt		—		3,734.8		—		—			3,734.8
Covered Bonds		—		1,982.2		—		—			1,982.2
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds		—		560.7		—		—			560.7
Other Asset-Backed		—		3,119.2		—		—			3,119.2
Auction Rate		—		—		16.6		—			16.6
Commercial Mortgage-Backed		—		198.7		—		—			198.7
Other		—		123.7		—		—			123.7
Total Available for Sale		5,018.8		26,800.2		16.6		—			31,835.6
Trading Account		—		1.2		—		—			1.2
Total Available for Sale and Trading Securities		5,018.8		26,801.4		16.6		—			31,836.8
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		2,482.1		—		—			2,482.1
Interest Rate Contracts		—		204.2		—		—			204.2
Total Derivative Assets		—		2,686.3		—		(1,698.0	)		988.3
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		2,475.4		—		—			2,475.4
Interest Rate Contracts		—		120.5		—		—			120.5
Other Financial Derivatives (1)		—		—		11.3		—			11.3
Total Derivative Liabilities	$	—	$	2,595.9	$	11.3	$	(1,461.8	)	$	1,145.4

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 June 30, 2015, derivative assets and liabilities shown above also include reductions of $387.9 million and $151.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(1) This line includes a swap related to the sale of certain Visa Class B common shares.

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
December 31, 2014
Securities
Available for Sale
U.S. Government	$	4,506.9	$	—	$	—	$	—		$	4,506.9
Obligations of States and Political Subdivisions		—		4.6		—		—			4.6
Government Sponsored Agency		—		16,389.2		—		—			16,389.2
Non-U.S. Government		—		310.4		—		—			310.4
Corporate Debt		—		3,577.7		—		—			3,577.7
Covered Bonds		—		1,907.5		—		—			1,907.5
Supranational and Non-U.S. Agency Bonds		—		360.6		—		—			360.6
Residential Mortgage-Backed		—		6.4		—		—			6.4
Other Asset-Backed		—		2,321.3		—		—			2,321.3
Auction Rate		—		—		18.1		—			18.1
Other		—		155.8		—		—			155.8
Total Available for Sale		4,506.9		25,033.5		18.1		—			29,558.5
Trading Account		—		4.7		—		—			4.7
Total Available for Sale and Trading Securities		4,506.9		25,038.2		18.1		—			29,563.2
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		4,275.2		—		—			4,275.2
Interest Rate Contracts		—		232.3		—		—			232.3
Total Derivative Assets		—		4,507.5		—		(2,257.1	)		2,250.4
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		4,095.5		—		—			4,095.5
Interest Rate Contracts		—		131.8		—		—			131.8
Total Derivative Liabilities	$	—	$	4,227.3	$	—	$	(3,173.3	)	$	1,054.0

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, 2014, derivative assets and liabilities shown above also include reductions of $315.8 million and $1.2 billion, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

The following tables present the changes in Level 3 assets and liabilities for the three and six months ended June 30, 2015, and 2014.

Table 30: Changes in Level 3 Assets

Level 3 Assets (In Millions)	Auction Rate Securities
Three Months Ended June 30,	2015			2014
Fair Value at April 1	$	17.5		$	98.5
Total Gains (Losses):
Included in Other Comprehensive Income (1)		0.5			0.5
Purchases, Issues, Sales, and Settlements
Sales		(1.2	)		—
Settlements		(0.2	)		(0.2	)
Fair Value at June 30	$	16.6		$	98.8
Six Months Ended June 30,	2015			2014
Fair Value at January 1	$	18.1		$	98.9
Total Gains (Losses):
Included in Other Comprehensive Income (1)		0.2			0.3
Purchases, Issues, Sales, and Settlements
Sales		(1.2	)		0.1
Settlements		(0.5	)		(0.5	)
Fair Value at June 30	$	16.6		$	98.8

(1) Unrealized gains (losses) are included in net unrealized gains (losses) on securities available for sale in the consolidated statements of comprehensive income.

Table 31: Changes in Level 3 Liabilities

Level 3 Liabilities (In Millions)	Contingent Consideration					Swap Related to Sale of Certain Visa Class B Common Shares
Three Months Ended June 30,	2015		2014			2015		2014
Fair Value at April 1	$	—	$	—		$	—	$	—
Total (Gains) Losses:
Included in Earnings (1)		—		—			11.3		—
Included in Other Comprehensive Income		—		—			—		—
Purchases, Issues, Sales, and Settlements
Purchases		—		—			—		—
Settlements		—		—			—		—
Fair Value at June 30	$	—	$	—		$	11.3	$	—
Six Months Ended June 30,	2015		2014			2015		2014
Fair Value at January 1	$	—	$	55.4		$	—	$	—
Total (Gains) Losses:
Included in Earnings (1)		—		(0.1	)		11.3		—
Included in Other Comprehensive Income		—		—			—		—
Purchases, Issues, Sales, and Settlements
Purchases		—		—			—		—
Settlements		—		(55.3	)		—		—
Fair Value at June 30	$	—	$	—		$	11.3	$	—

(1) (Gains) losses are recorded in other operating income (expense) in the consolidated statements of income.

During the six months ended June 30, 2015 and 2014, there were no transfers into or out of Level 3 assets or liabilities.

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 disclose separately these subsequent fair value measurements and to classify them under the fair value hierarchy.

Assets measured at fair value on a nonrecurring basis at June 30, 2015, and 2014, all of which were categorized as Level 3 under the fair value hierarchy, were comprised of impaired 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, and were subject to adjustments to reflect management’s judgment as to realizable value. 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 impaired loans and OREO assets that have been adjusted to fair value totaled $20.9 million and $0.3 million, respectively, at June 30, 2015, and $16.9 million and $1.4 million, respectively, at June 30, 2014. Assets measured at fair value on a nonrecurring basis reflect management’s judgment as to realizable value.

The following table provides the fair value of, and the valuation technique, significant unobservable inputs and quantitative information used to develop the significant unobservable inputs for, Northern Trust’s Level 3 assets that were measured at fair value on a nonrecurring basis as of June 30, 2015.

Table 32: Level 3 Nonrecurring Basis Significant Unobservable Inputs

Financial Instrument	Fair Value	Valuation Technique	Unobservable Input	Range of Discounts Applied
Loans	$20.9 million	Market Approach	Discount to reflect realizable value	15% — 25%
OREO	$0.3 million	Market Approach	Discount to reflect realizable value	15% — 20%

Fair Value of Financial Instruments. GAAP requires disclosure of the estimated fair value of certain financial instruments and the methods and significant assumptions used to estimate fair value. It excludes from this requirement nonfinancial assets and liabilities, as well as a wide range of franchise, relationship and intangible values that add value to Northern Trust. Accordingly, the required fair value disclosures provide only a partial estimate of the fair value of Northern Trust. Financial instruments recorded at fair value in Northern Trust’s consolidated balance sheets are discussed above. The following methods and assumptions were used in estimating the fair values of financial instruments that are not carried at fair value.

Held to Maturity Securities. The fair values of held to maturity securities were modeled by external pricing vendors, or in limited cases internally, using widely accepted models which are based on an income approach (discounted cash flow) that incorporates current market yield curves.

Loans (excluding lease receivables). The fair value of the loan portfolio was estimated using an income approach (discounted cash flow) that incorporates current market rates offered by Northern Trust as of the date of the consolidated financial statements. The fair values of all loans were adjusted to reflect current assessments of loan collectability.

Federal Reserve and Federal Home Loan Bank Stock. The fair values of Federal Reserve and Federal Home Loan Bank stock are equal to their carrying values which represent redemption value.

Community Development Investments. The fair values of these instruments were estimated using an income approach (discounted cash flow) that incorporates current market rates.

Employee Benefit and Deferred Compensation. These assets include U.S. Treasury securities and investments in mutual and collective trust funds held to fund certain supplemental employee benefit obligations and deferred compensation plans. Fair values of U.S. Treasury securities were determined using quoted, active market prices for identical securities. The fair values of investments in mutual and collective trust funds were valued at the funds’ net asset values based on a market approach.

Savings Certificates and Other Time Deposits. The fair values of these instruments were estimated using an income approach (discounted cash flow) that incorporates market interest rates currently offered by Northern Trust for deposits with similar maturities.

Senior Notes, Subordinated Debt, and Floating Rate Capital Debt. Fair values were determined using a market approach based on quoted market prices, when available. If quoted market prices were not available, fair values were based on quoted market prices for comparable instruments.

Federal Home Loan Bank Borrowings. The fair values of these instruments were estimated using an income approach (discounted cash flow) that incorporates market interest rates available to Northern Trust.

Loan Commitments. The fair values of loan commitments represent the estimated costs to terminate or otherwise settle the obligations with a third party adjusted for any related allowance for credit losses.

Standby Letters of Credit. The fair values of standby letters of credit are measured as the amount of unamortized fees on these instruments, inclusive of the related allowance for credit losses. Fees are determined by applying basis points to the principal amounts of the letters of credit.

Financial Instruments Valued at Carrying Value. Due to their short maturity, the carrying values of certain financial instruments approximated their fair values. These financial instruments include: cash and due from banks; federal funds sold and securities purchased under agreements to resell; interest-bearing deposits with banks; Federal Reserve deposits; client security settlement receivables; non-U.S. offices interest-bearing deposits; federal funds purchased; securities sold under agreements to repurchase; and other borrowings (includes term federal funds purchased and other short-term borrowings). The fair values of demand, noninterest-bearing, savings, and money market deposits represent the amounts payable on demand as of the reporting date, although such deposits are typically priced at a premium in banking industry consolidations.

The following tables summarize the fair values of all financial instruments.

Table 33: Fair Value of Financial Instruments

(In Millions)	June 30, 2015
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	7,152.9	$	7,152.9	$	7,152.9	$	—	$	—
Federal Funds Sold and Resell Agreements		1,020.0		1,020.0		—		1,020.0		—
Interest-Bearing Deposits with Banks		15,650.3		15,650.3		—		15,650.3		—
Federal Reserve Deposits		17,488.7		17,488.7		—		17,488.7		—
Securities
Available for Sale (1)		31,835.6		31,835.6		5,018.8		26,800.2		16.6
Held to Maturity		6,990.8		6,986.4		—		6,986.4		—
Trading Account		1.2		1.2		—		1.2		—
Loans (excluding Leases)
Held for Investment		31,863.4		32,022.3		—		—		32,022.3
Held for Sale		3.9		3.9		—		—		3.9
Client Security Settlement Receivables		2,034.2		2,034.2		—		2,034.2		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		178.1		178.1		—		178.1		—
Community Development Investments		187.4		186.2		—		186.2		—
Employee Benefit and Deferred Compensation		161.3		161.1		109.5		51.6		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	46,237.5	$	46,237.5	$	46,237.5	$	—	$	—
Savings Certificates and Other Time		1,540.5		1,554.4		—		1,554.4		—
Non U.S. Offices Interest-Bearing		52,909.9		52,909.9		—		52,909.9		—
Federal Funds Purchased		351.3		351.3		—		351.3		—
Securities Sold under Agreements to Repurchase		29.8		29.8		—		29.8		—
Other Borrowings		3,322.9		3,325.2		—		3,325.2		—
Senior Notes		1,497.2		1,534.1		—		1,534.1		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,330.1		1,338.3		—		1,338.3		—
Floating Rate Capital Debt		277.3		244.6		—		244.6		—
Other Liabilities
Standby Letters of Credit		43.5		43.5		—		—		43.5
Loan Commitments		25.6		25.6		—		—		25.6
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	30.8	$	30.8	$	—	$	30.8	$	—
Liabilities		58.7		58.7		—		58.7		—
Interest Rate Contracts
Assets		107.7		107.7		—		107.7		—
Liabilities		27.4		27.4		—		27.4		—
Other Financial Derivatives (2)
Liabilities		11.3		11.3		—		—		11.3
Client-Related and Trading
Foreign Exchange Contracts
Assets		2,451.3		2,451.3		—		2,451.3		—
Liabilities		2,416.7		2,416.7		—		2,416.7		—
Interest Rate Contracts
Assets		96.5		96.5		—		96.5		—
Liabilities		93.1		93.1		—		93.1		—

(1) Refer to the table located on page 39 for the disaggregation of available for sale securities.

(2) This line includes a swap related to the sale of certain Visa Class B common shares.

(In Millions)	December 31, 2014
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	3,050.6	$	3,050.6	$	3,050.6	$	—	$	—
Federal Funds Sold and Resell Agreements		1,062.7		1,062.7		—		1,062.7		—
Interest-Bearing Deposits with Banks		14,928.3		14,928.3		—		14,928.3		—
Federal Reserve Deposits		17,386.3		17,386.3		—		17,386.3		—
Securities
Available for Sale (1)		29,558.5		29,558.5		4,506.9		25,033.5		18.1
Held to Maturity		4,170.8		4,176.1		—		4,176.1		—
Trading Account		4.7		4.7		—		4.7		—
Loans (excluding Leases)
Held for Investment		30,458.0		30,600.4		—		—		30,600.4
Held for Sale		2.5		2.5		—		—		2.5
Client Security Settlement Receivables		1,568.8		1,568.8		—		1,568.8		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		207.5		207.5		—		207.5		—
Community Development Investments		209.9		210.8		—		210.8		—
Employee Benefit and Deferred Compensation		143.2		146.7		96.7		50.0		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	41,454.6	$	41,454.6	$	41,454.6	$	—	$	—
Savings Certificates and Other Time		1,757.4		1,757.0		—		1,757.0		—
Non U.S. Offices Interest-Bearing		47,545.0		47,545.0		—		47,545.0		—
Federal Funds Purchased		932.9		932.9		—		932.9		—
Securities Sold under Agreements to Repurchase		885.1		885.1		—		885.1		—
Other Borrowings		1,685.2		1,686.2		—		1,686.2		—
Senior Notes		1,497.0		1,541.8		—		1,541.8		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,583.3		1,583.4		—		1,583.4		—
Floating Rate Capital Debt		277.2		242.8		—		242.8		—
Other Liabilities
Standby Letters of Credit		60.1		60.1		—		—		60.1
Loan Commitments		28.3		28.3		—		—		28.3
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	125.7	$	125.7	$	—	$	125.7	$	—
Liabilities		23.5		23.5		—		23.5		—
Interest Rate Contracts
Assets		126.8		126.8		—		126.8		—
Liabilities		30.5		30.5		—		30.5		—
Client-Related and Trading
Foreign Exchange Contracts
Assets		4,149.5		4,149.5		—		4,149.5		—
Liabilities		4,072.0		4,072.0		—		4,072.0		—
Interest Rate Contracts
Assets		105.5		105.5		—		105.5		—
Liabilities		101.3		101.3		—		101.3		—

(1) Refer to the table located on page 40 for the disaggregation of available for sale securities.

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Income Taxes

6 Months Ended

Jun. 30, 2015

Income Taxes

15. Income Taxes — Income tax expense for the three and six months ended June 30, 2015 of $142.2 million and $261.5 million was recorded representing an effective tax rate of 34.6% and 34.4%, respectively. The prior-year three- and six-month provisions for income taxes were $88.8 million and $176.9 million, representing an effective tax rate of 32.8% for both the three and six months then ended.

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Stockholders' Equity

6 Months Ended

Jun. 30, 2015

Stockholders' Equity

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 June 30, 2015, and December 31, 2014, preferred stock totaled $388.5 million, related to the issuance of Series C Non-Cumulative Perpetual Preferred Stock (Series C Preferred Stock) in August 2014. As of June 30, 2015, and December 31, 2014, 16 million depositary shares, each representing 1/1000 ownership interest in a share of Series C Preferred Stock, were issued and outstanding. Series C Preferred Stock has no par value and has a liquidation preference of $25,000 ($25 per depositary share).

Dividends on the Series C Preferred Stock 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, at a rate per annum equal to 5.85%. On April 21, 2015, the Corporation declared a cash dividend of $365.625 per share of Series C Preferred Stock payable on July 1, 2015, to stockholders of record as of June 15, 2015.

Common Stock. During the three and six months ended June 30, 2015, the Corporation repurchased 1,295,263 shares at a cost of $96.7 million ($74.64 average price per share) and 2,851,133 shares at a cost of $203.9 million ($71.52 average price per share), respectively. The Corporation’s current common stock repurchase authorization was approved by the Board of Directors in April 2015, pursuant to which the Corporation may repurchase up to 15 million shares. The stock repurchase authorization remaining as of June 30, 2015 was 13,704,737 shares. The repurchase authorization approved by the Board of Directors has no expiration date.

Under the Corporation’s capital plan submitted in January 2015, which was reviewed without objection by the Federal Reserve, the Corporation may repurchase up to $578.3 million of common stock after June 30, 2015, through June 2016.

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Compensation Expense for Share-Based Payment Arrangements and Associated Tax Impacts (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	$ 19.2	$ 20.2	$ 42.1	$ 43.3
Tax Benefits Recognized	7.2	7.5	15.8	16.2
Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	13.4	14.9	26.9	29.0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	1.7	2.1	7.7	8.5
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	$ 4.1	$ 3.2	$ 7.5	$ 5.8

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Allowance for Credit Losses

6 Months Ended

Jun. 30, 2015

Allowance for Credit Losses

7. Allowance for Credit Losses — The allowance for credit losses, which represents management’s estimate of probable losses related to specific borrower relationships and inherent in the various loan and lease portfolios, undrawn commitments, and standby letters of credit, is determined by management through a disciplined credit review process. Northern Trust’s accounting policies related to the estimation of the allowance for credit losses and the charging off of loans, leases and other extensions of credit deemed uncollectible are consistent across both loan and lease segments.

In establishing the inherent portion of the allowance for credit losses, Northern Trust’s Loan Loss Reserve Committee assesses a common set of qualitative factors applicable to both the commercial and personal loan segments. The risk characteristics underlying these qualitative factors, and management’s assessments as to the relative importance of a qualitative factor, can vary between loan segments and between classes within loan segments. Factors evaluated include those related to external matters, such as economic conditions and changes in collateral value, and those related to internal matters, such as changes in asset quality metrics and loan review activities. In addition to the factors noted above, risk characteristics such as portfolio delinquencies, percentage of portfolio on the watch list and on nonperforming status, and average borrower ratings are assessed in the determination of the inherent allowance.

Loan-to-value levels are considered for collateral-secured loans and leases in both the personal and commercial segments. Borrower debt service coverage is evaluated in the personal segment, and cash flow coverage is analyzed in the commercial segment.

Similar risk characteristics by type of exposure are analyzed when determining the allowance for undrawn commitments and standby letters of credit. These qualitative factors, together with historical loss rates, serve as the basis for the allowance for credit losses.

Loans, leases and other extensions of credit deemed uncollectible are charged to the allowance for credit losses. Subsequent recoveries, if any, are credited to the allowance. Determinations as to whether an uncollectible loan is charged-off or a specific allowance is established are based on management’s assessment as to the level of certainty regarding the amount of loss.

The following tables provide information regarding changes in the total allowance for credit losses by segment during the three and six months ended June 30, 2015 and 2014.

Table 46: Changes in the Allowance for Credit Losses

	Three Months Ended June 30,
	2015									2014
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	164.3		$	122.4		$	286.7		$	173.1		$	136.3		$	309.4
Charge-Offs		(2.5	)		(3.6	)		(6.1	)		(2.1	)		(5.7	)		(7.8	)
Recoveries		2.4			1.1			3.5			0.3			1.6			1.9
Net (Charge-Offs) Recoveries		(0.1	)		(2.5	)		(2.6	)		(1.8	)		(4.1	)		(5.9	)
Provision for Credit Losses		(11.6	)		1.6			(10.0	)		(2.6	)		2.6			—
Effect of Foreign Exchange Rates		0.1			—			0.1			—			—			—
Balance at End of Period	$	152.7		$	121.5		$	274.2		$	168.7		$	134.8		$	303.5

	Six Months Ended June 30,
	2015									2014
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	169.7		$	126.2		$	295.9		$	168.0		$	139.9		$	307.9
Charge-Offs		(5.2	)		(8.4	)		(13.6	)		(6.3	)		(13.0	)		(19.3	)
Recoveries		4.1			2.3			6.4			8.8			3.1			11.9
Net (Charge-Offs) Recoveries		(1.1	)		(6.1	)		(7.2	)		2.5			(9.9	)		(7.4	)
Provision for Credit Losses		(15.9	)		1.4			(14.5	)		(1.8	)		4.8			3.0
Effect of Foreign Exchange Rates		—			—			—			—			—			—
Balance at End of Period	$	152.7		$	121.5		$	274.2		$	168.7		$	134.8		$	303.5

The following table provides information regarding the balances of the recorded investments in loans and leases and the allowance for credit losses by segment as of June 30, 2015, and December 31, 2014.

Table 47: Information about the Recorded Investments in Loans and Leases

	June 30, 2015						December 31, 2014
(In Millions)	Commercial		Personal		Total		Commercial		Personal		Total
Loans and Leases
Specifically Evaluated for Impairment	$	52.7	$	166.3	$	219.0	$	78.9	$	163.3	$	242.2
Evaluated for Inherent Impairment		15,252.2		17,482.6		32,734.8		14,274.7		17,123.3		31,398.0
Total Loans and Leases		15,304.9		17,648.9		32,953.8		14,353.6		17,286.6		31,640.2
Allowance for Loans and Leases
Specifically Evaluated for Impairment		7.8		3.0		10.8		5.8		0.8		6.6
Evaluated for Inherent Impairment		131.2		115.3		246.5		138.0		122.4		260.4
Allowance Assigned to Loans and Leases		139.0		118.3		257.3		143.8		123.2		267.0
Allowance for Unfunded Exposures
Commitments and Standby Letters of Credit		13.7		3.2		16.9		25.9		3.0		28.9
Total Allowance for Credit Losses	$	152.7	$	121.5	$	274.2	$	169.7	$	126.2	$	295.9

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Amounts Outstanding for Loans and Leases by Segment and Class (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 32,953.8	$ 31,640.2
Allowance for Credit Losses Assigned to Loans and Leases	(257.3)	(267.0)
Net Loans and Leases	32,696.5	31,373.2
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and Institutional	8,999.1	8,381.9
Commercial Real Estate	3,651.4	3,333.3
Lease Financing, net	832.9	916.3
Non-U.S.	1,533.1	1,530.6
Other	288.4	191.5
Total Loans and Leases	15,304.9	14,353.6
Allowance for Credit Losses Assigned to Loans and Leases	(139.0)	(143.8)
Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential Real Estate	9,369.0	9,782.6
Private Client	8,224.0	7,466.9
Other	55.9	37.1
Total Loans and Leases	17,648.9	17,286.6
Allowance for Credit Losses Assigned to Loans and Leases	$ (118.3)	$ (123.2)

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Securities Sold Under Agreements to Repurchase

6 Months Ended

Jun. 30, 2015

Securities Sold Under Agreements to Repurchase

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 June 30, 2015.

Table 40: Repurchase Agreements Accounted for as Secured Borrowings

	June 30, 2015
(In Millions)	Remaining Contractual Maturity of the Agreements
Repurchase Agreements	Overnight and Continuous
U.S. Treasury and Agency Securities	$	29.8
Total Borrowings	$	29.8
Gross Amount of Recognized Liabilities for Repurchase Agreements in footnote 21	$	29.8
Amounts related to agreements not included in footnote 21	$	—

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Loans and Leases

6 Months Ended

Jun. 30, 2015

Loans and Leases

6. Loans and Leases — Amounts outstanding for loans and leases, by segment and class, are shown below.

Table 41: Loans and Leases

(In Millions)	June 30, 2015			December 31, 2014
Commercial
Commercial and Institutional	$	8,999.1		$	8,381.9
Commercial Real Estate		3,651.4			3,333.3
Lease Financing, net		832.9			916.3
Non-U.S.		1,533.1			1,530.6
Other		288.4			191.5
Total Commercial		15,304.9			14,353.6
Personal
Residential Real Estate		9,369.0			9,782.6
Private Client		8,224.0			7,466.9
Other		55.9			37.1
Total Personal		17,648.9			17,286.6
Total Loans and Leases		32,953.8			31,640.2
Allowance for Credit Losses Assigned to Loans and Leases		(257.3	)		(267.0	)
Net Loans and Leases	$	32,696.5		$	31,373.2

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 June 30, 2015, and December 31, 2014, equity credit lines totaled $1.7 billion and $1.8 billion, respectively, and equity credit lines for which first liens were held by Northern Trust represented 89% of the total equity credit lines as of both of those dates.

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, that totaled $1.4 billion at June 30, 2015, and $1.5 billion at December 31, 2014. Demand deposits reclassified as loan balances totaled $46.7 million and $92.1 million at June 30, 2015, and December 31, 2014, respectively. Loans classified as held for sale totaled $3.9 million at June 30, 2015. Loans classified as held for sale totaled $2.5 million at December 31, 2014.

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, management reporting and the calculation of credit loss allowances and economic capital.

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 or other subjective assessment methodologies, 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 validated at least annually.

Loan and lease segment and class balances as of June 30, 2015, and December 31, 2014, are provided below, segregated by borrower ratings into “1 to 3,” “4 to 5” and “6 to 9” (watch list), categories.

Table 42: Borrower Ratings

	June 30, 2015								December 31, 2014
(In Millions)	1 to 3 Category		4 to 5 Category		6 to 9 Category (Watch List)		Total		1 to 3 Category		4 to 5 Category		6 to 9 Category (Watch List)		Total
Commercial
Commercial and Institutional	$	5,820.5	$	3,071.1	$	107.5	$	8,999.1	$	5,340.9	$	2,947.3	$	93.7	$	8,381.9
Commercial Real Estate		1,596.8		1,988.7		65.9		3,651.4		1,371.7		1,861.8		99.8		3,333.3
Lease Financing, net		477.6		352.4		2.9		832.9		552.5		360.3		3.5		916.3
Non-U.S.		770.2		762.7		0.2		1,533.1		636.8		892.9		0.9		1,530.6
Other		186.4		102.0		—		288.4		108.1		83.4		—		191.5
Total Commercial		8,851.5		6,276.9		176.5		15,304.9		8,010.0		6,145.7		197.9		14,353.6
Personal
Residential Real Estate		2,794.7		6,195.2		379.1		9,369.0		3,148.0		6,207.0		427.6		9,782.6
Private Client		5,216.7		2,992.5		14.8		8,224.0		5,143.8		2,311.7		11.4		7,466.9
Other		36.1		19.8		—		55.9		21.1		16.0		—		37.1
Total Personal		8,047.5		9,207.5		393.9		17,648.9		8,312.9		8,534.7		439.0		17,286.6
Total Loans and Leases	$	16,899.0	$	15,484.4	$	570.4	$	32,953.8	$	16,322.9	$	14,680.4	$	636.9	$	31,640.2

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 reduced cushion in adverse down cycle scenarios. 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 nonperforming 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.

Recognition of Income. Interest income on loans 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 nonperforming and interest income is recorded on a cash basis. At the time a loan is determined to be nonperforming, interest accrued but not collected is reversed against interest income in the current period. Interest collected on nonperforming 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. Nonperforming loans are returned to performing status when factors indicating doubtful collectability no longer exist. Factors considered in returning a loan to performing 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 performing 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 performing status provided there has been a sustained period of repayment performance (generally a minimum of six months) 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 months) under the revised terms.

Past due status is based on how long since the contractual due date a principal or interest payment has been past due. For disclosure purposes, loans that are 29 days past due or less are reported as current. The following tables provide balances and delinquency status of performing and nonperforming loans and leases by segment and class, as well as the total OREO and nonperforming asset balances, as of June 30, 2015, and December 31, 2014.

Table 43: Delinquency Status

June 30, 2015
(In Millions)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	8,880.3	$	5.5	$	87.5	$	2.4	$	8,975.7	$	23.4	$	8,999.1
Commercial Real Estate		3,590.5		19.4		11.3		4.2		3,625.4		26.0		3,651.4
Lease Financing, net		832.9		—		—		—		832.9		—		832.9
Non-U.S.		1,533.1		—		—		—		1,533.1		—		1,533.1
Other		288.4		—		—		—		288.4		—		288.4
Total Commercial		15,125.2		24.9		98.8		6.6		15,255.5		49.4		15,304.9
Personal
Residential Real Estate		9,196.0		6.5		6.4		1.9		9,210.8		158.2		9,369.0
Private Client		8,180.3		31.5		4.7		6.4		8,222.9		1.1		8,224.0
Other		55.9		—		—		—		55.9		—		55.9
Total Personal		17,432.2		38.0		11.1		8.3		17,489.6		159.3		17,648.9
Total Loans and Leases	$	32,557.4	$	62.9	$	109.9	$	14.9	$	32,745.1	$	208.7	$	32,953.8
								Other Real Estate Owned				10.1
								Total Nonperforming Assets			$	218.8

December 31, 2014
(In Millions)	Current		30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	8,340.5	$	14.5	$	4.0	$	7.9	$	8,366.9	$	15.0	$	8,381.9
Commercial Real Estate		3,274.3		9.6		9.8		2.5		3,296.2		37.1		3,333.3
Lease Financing, net		916.3		—		—		—		916.3		—		916.3
Non-U.S.		1,530.6		—		—		—		1,530.6		—		1,530.6
Other		191.5		—		—		—		191.5		—		191.5
Total Commercial		14,253.2		24.1		13.8		10.4		14,301.5		52.1		14,353.6
Personal
Residential Real Estate		9,556.3		49.5		9.9		4.5		9,620.2		162.4		9,782.6
Private Client		7,396.0		56.0		5.9		7.8		7,465.7		1.2		7,466.9
Other		37.1		—		—		—		37.1		—		37.1
Total Personal		16,989.4		105.5		15.8		12.3		17,123.0		163.6		17,286.6
Total Loans and Leases	$	31,242.6	$	129.6	$	29.6	$	22.7	$	31,424.5	$	215.7	$	31,640.2
								Other Real Estate Owned				16.6
								Total Nonperforming Assets			$	232.3

Impaired Loans. A loan is considered to be impaired when, based on current information and events, management determines that it is probable that Northern Trust will be unable to collect all amounts due according to the contractual terms of the loan agreement. Impaired loans are identified through ongoing credit management and risk rating processes, including the formal review of past due and watch list credits. Payment performance and delinquency status are critical factors in identifying impairment for all loans and leases, particularly those within the residential real estate, private client and personal-other classes. Other key factors considered in identifying impairment of loans and leases within the commercial and institutional, non-U.S., lease financing and commercial-other classes relate to the borrower’s ability to perform under the terms of the obligation as measured through the assessment of future cash flows, including consideration of collateral value, market value and other factors. A loan is also considered to be impaired if its terms have been modified as a concession resulting from the debtor’s financial difficulties, referred to as a troubled debt restructuring (TDR) and discussed in further detail below. Impairment is measured based upon the loan’s market price, the present value of expected future cash flows, discounted at the loan’s effective interest rate, or the fair value of the collateral if the loan is collateral dependent. If the loan valuation is less than the recorded value of the loan, based on the certainty of loss, either a specific allowance is established or a charge-off is recorded for the difference. Smaller balance (individually less than $250,000) homogeneous loans are collectively evaluated for impairment and excluded from impaired loan disclosures as allowed under applicable accounting standards. Northern Trust’s accounting policies for impaired loans is consistent across all classes of loans and leases.

The following tables provide information related to impaired loans by segment and class.

Table 44: Information about Impaired Loans as of the Period End

	As of June 30, 2015						As of December 31, 2014
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Allowance		Recorded Investment		Unpaid Principal Balance		Specific Allowance
With No Related Specific Allowance
Commercial and Institutional	$	8.8	$	11.9	$	—	$	9.0	$	12.0	$	—
Commercial Real Estate		23.9		29.1		—		47.0		52.4		—
Lease Financing, net		—		—		—		4.2		4.2		—
Residential Real Estate		155.7		200.5		—		160.9		204.8		—
Private Client		0.8		0.8		—		0.2		0.5		—
With a Related Specific Allowance
Commercial and Institutional		11.5		7.1		4.9		6.5		6.6		2.9
Commercial Real Estate		5.6		6.6		1.5		12.2		18.3		2.9
Lease Financing, net		2.9		2.9		1.4		—		—		—
Residential Real Estate		9.0		9.2		2.6		1.4		1.4		0.4
Private Client		0.8		0.8		0.4		0.8		0.8		0.4
Total
Commercial		52.7		57.6		7.8		78.9		93.5		5.8
Personal		166.3		211.3		3.0		163.3		207.5		0.8
Total	$	219.0	$	268.9	$	10.8	$	242.2	$	301.0	$	6.6

	Three Months Ended June 30,								Six Months Ended June 30,
	2015				2014				2015				2014
(In Millions)	Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With No Related Specific Allowance
Commercial and Institutional	$	8.1	$	—	$	10.6	$	—	$	8.6	$	—	$	11.0	$	—
Commercial Real Estate		33.9		0.2		44.7		0.2		41.2		0.4		44.8		0.5
Lease Financing, net		—		—		4.3		—		3.4		0.1		4.4		0.1
Residential Real Estate		155.7		0.5		181.2		0.7		158.5		0.8		185.2		1.3
Private Client		0.6		—		0.7		—		0.4		—		0.7		—
With a Related Specific Allowance
Commercial and Institutional		12.2		—		9.7		—		10.3		—		9.9		—
Commercial Real Estate		10.2		—		22.7		—		11.2		—		24.6		—
Lease Financing, net		3.2		—		—		—		1.6		—		—		—
Residential Real Estate		6.8		—		3.8		—		4.8		—		5.4		—
Private Client		0.8		—		0.5		—		0.8		—		0.3		—
Total
Commercial		67.6		0.2		92.0		0.2		76.3		0.5		94.7		0.6
Personal		163.9		0.5		186.2		0.7		164.5		0.8		191.6		1.3
Total	$	231.5	$	0.7	$	278.2	$	0.9	$	240.8	$	1.3	$	286.3	$	1.9

Note: Average recorded investment in impaired loans is calculated as the average of the month-end impaired loan balances for the period.

Interest income that would have been recorded for nonperforming loans in accordance with their original terms was $2.0 million and $2.4 million, respectively, for the three months ended June 30, 2015 and 2014, and $4.1 million and $4.9 million, respectively, for the six months ended June 30, 2015 and 2014.

There were $2.6 million and $2.4 million of aggregate undrawn loan commitments and standby letters of credit at June 30, 2015, and December 31, 2014, respectively, issued to borrowers whose loans were classified as nonperforming or impaired.

Troubled Debt Restructurings (TDRs). Included within impaired loans were $82.2 million and $82.7 million of nonperforming TDRs, and $46.9 million and $68.6 million of performing TDRs as of June 30, 2015, and December 31, 2014, respectively. All TDRs are reported as impaired loans in the calendar year of their restructuring. In subsequent years, a TDR may cease being reported as impaired if the loan was modified at a market rate and has performed according to the modified terms for at least six months. A loan that has been modified at a below market rate will return to performing status if it satisfies the six-month performance requirement; however, it will remain reported as impaired.

The following tables provide, by segment and class, the number of loans and leases modified in TDRs during the three- and six-month periods ended June 30, 2015 and 2014, and the recorded investments and unpaid principal balances as of June 30, 2015 and 2014.

Table 45: Troubled Debt Restructurings

($ In Millions)	Three Months Ended June 30, 2015						Six Months Ended June 30, 2015
	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	$	0.1	$	0.1		2	$	0.1	$	0.1
Commercial Real Estate		—		—		—		1		0.8		0.8
Total Commercial		1		0.1		0.1		3		0.9		0.9
Personal
Residential Real Estate		19		8.5		9.4		76		15.6		19.6
Private Client		1		0.6		0.6		1		0.6		0.6
Total Personal		20		9.1		10.0		77		16.2		20.2
Total Loans and Leases		21	$	9.2	$	10.1		80	$	17.1	$	21.1

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

($ In Millions)	Three Months Ended June 30, 2014						Six Months Ended June 30, 2014
	Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance		Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance
Commercial
Commercial and Institutional		2	$	0.7	$	1.0		2	$	0.7	$	1.0
Commercial Real Estate		—		—		—		1		0.7		0.7
Total Commercial		2		0.7		1.0		3		1.4		1.7
Personal
Residential Real Estate		34		4.9		5.7		68		8.4		9.4
Private Client		2		0.3		0.3		3		0.3		0.3
Total Personal		36		5.2		6.0		71		8.7		9.7
Total Loans and Leases		38	$	5.9	$	7.0		74	$	10.1	$	11.4

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

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

During the three and six months ended June 30, 2015, the TDR modifications of the loans within commercial and institutional and private client were extensions of term. The majority of the TDR modifications within residential real estate were interest rate concessions, extensions of term or deferred principal. During the three and six months ended June 30, 2014, TDR modifications of loans within the commercial real estate, residential real estate, and private client classes were extensions of term.

There were four residential real estate loans modified as TDRs in the 12 months ended March 31, 2015, which subsequently became nonperforming during the three and six months ended June 30, 2015. The total recorded investment and unpaid principal balance for these loans was approximately $0.6 million and $0.7 million, respectively.

There were three residential real estate loans modified as TDRs in the 12 months ended March 31, 2014 which subsequently became nonperforming during the three and six months ended June 30, 2014. The total recorded investment and unpaid principal balance for these loans were $0.5 million and $0.9 million, respectively. There was one private client loan modified as a TDR in the 12 months ended March 31, 2014 which subsequently became nonperforming during the three and six months ended June 30, 2014. The total recorded investment and unpaid principal balance for this loan was de minimis.

All loans and leases modified in troubled debt restructurings are evaluated for impairment. The nature and extent of impairment of TDRs, including those that have experienced a subsequent default, is considered in the determination of an appropriate level of allowance for credit losses.

Northern Trust may obtain physical possession of residential real estate collateralizing a consumer mortgage loan via foreclosure on an in-substance repossession. As of June 30, 2015, Northern Trust held foreclosed residential real estate properties with a carrying value of $8.4 million as a result of obtaining physical possession. In addition, as of June 30, 2015, Northern Trust had consumer loans with a carrying value of $24.4 million collateralized by residential real estate property for which formal foreclosure proceedings were in process.

Leveraged Leases. During the three months ended June 30, 2015, Northern Trust determined that there was an other-than-temporary impairment of the residual value related to certain aircraft under leveraged lease agreements. The impact of the impairment was $17.8 million, which was recognized as a reduction to interest income in the consolidated statements of income during the three months ended June 30, 2015. See “Leveraged Leases” under Note 18 — Variable Interest Entities for further information.

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Pledged Assets

6 Months Ended

Jun. 30, 2015

Pledged Assets

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 Federal Home Loan Bank borrowings, as well as for other purposes, including support for securities settlement, primarily related to client activities, and for potential Federal Reserve Bank discount window borrowings. As of June 30, 2015, securities and loans totaling $32.9 billion ($23.7 billion of government-sponsored agency and other securities, $103.9 million of obligations of states and political subdivisions and $9.1 billion of loans) were pledged. This compares to $32.3 billion ($23.1 billion of government-sponsored agency and other securities, $122.9 million of obligations of states and political subdivisions and $9.1 billion of loans) at December 31, 2014. Collateral required for these purposes totaled $5.1 billion and $5.9 billion at June 30, 2015, and December 31, 2014, respectively. Included in the total pledged assets at June 30, 2015, and December 31, 2014, were available for sale securities with a total fair value of $17.9 million and $884.8 million, respectively, which were pledged as collateral for agreements to repurchase securities sold transactions. The secured parties to these transactions have the right to repledge or sell these securities.

Northern Trust is not permitted, by contract or custom, to repledge or sell collateral from agreements to resell securities purchased transactions. The total fair value of accepted collateral was $1.0 billion as of each of June 30, 2015 and December 31, 2014. There was no repledged or sold collateral at June 30, 2015 or December 31, 2014.

Deposits maintained to meet Federal Reserve Bank reserve requirements averaged $1.7 billion and $1.6 billion for the three and six months ended June 30, 2015, respectively, and $1.3 billion and $1.2 billion for the three and six months ended June 30, 2014, respectively.

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Impaired Loans by Segment and Class (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded Investment		$ 219.0		$ 219.0		$ 242.2
Unpaid principal balance		268.9		268.9		301.0
Specific allowance		10.8		10.8		6.6
Average recorded investment	[1]	231.5	$ 278.2	240.8	$ 286.3
Interest income recognized		0.7	0.9	1.3	1.9
Commercial
Financing Receivable, Impaired [Line Items]
Recorded Investment		52.7		52.7		78.9
Unpaid principal balance		57.6		57.6		93.5
Specific allowance		7.8		7.8		5.8
Average recorded investment	[1]	67.6	92.0	76.3	94.7
Interest income recognized		0.2	0.2	0.5	0.6
Commercial | Commercial and Institutional
Financing Receivable, Impaired [Line Items]
With no related specific reserve, recorded investment		8.8		8.8		9.0
With a related specific reserve, recorded investment		11.5		11.5		6.5
With no related specific reserve, recorded investment		8.8		8.8		9.0
With no related specific reserve, unpaid principal balance		11.9		11.9		12.0
With a related specific reserve, unpaid principal balance		7.1		7.1		6.6
Specific allowance		4.9		4.9		2.9
With no related specific reserve, average recorded investment	[1]	8.1	10.6	8.6	11.0
With a related specific reserve, average recorded investment	[1]	12.2	9.7	10.3	9.9
With a related specific reserve, interest income recognized		0.0	0.0	0.0	0.0
Commercial | Commercial Real Estate
Financing Receivable, Impaired [Line Items]
With no related specific reserve, recorded investment		23.9		23.9		47.0
With a related specific reserve, recorded investment		5.6		5.6		12.2
With no related specific reserve, recorded investment		23.9		23.9		47.0
With no related specific reserve, unpaid principal balance		29.1		29.1		52.4
With a related specific reserve, unpaid principal balance		6.6		6.6		18.3
Specific allowance		1.5		1.5		2.9
With no related specific reserve, average recorded investment	[1]	33.9	44.7	41.2	44.8
With a related specific reserve, average recorded investment	[1]	10.2	22.7	11.2	24.6
With no related specific reserve, interest income recognized		0.2	0.2	0.4	0.5
With a related specific reserve, interest income recognized		0.0	0.0	0.0	0.0
Commercial | Lease Financing, net
Financing Receivable, Impaired [Line Items]
With no related specific reserve, recorded investment		2.9		2.9		4.2
With no related specific reserve, recorded investment		2.9		2.9		4.2
With no related specific reserve, unpaid principal balance						4.2
With a related specific reserve, unpaid principal balance		2.9		2.9
Specific allowance		1.4		1.4
With no related specific reserve, average recorded investment	[1]		4.3	3.4	4.4
With a related specific reserve, average recorded investment	[1]	3.2		1.6
With no related specific reserve, interest income recognized				0.1	0.1
With a related specific reserve, interest income recognized		0.0	0.0	0.0	0.0
Personal
Financing Receivable, Impaired [Line Items]
Recorded Investment		166.3		166.3		163.3
Unpaid principal balance		211.3		211.3		207.5
Specific allowance		3.0		3.0		0.8
Average recorded investment	[1]	163.9	186.2	164.5	191.6
Interest income recognized		0.5	0.7	0.8	1.3
Personal | Residential Real Estate
Financing Receivable, Impaired [Line Items]
With no related specific reserve, recorded investment		155.7		155.7		160.9
With a related specific reserve, recorded investment		9.0		9.0		1.4
With no related specific reserve, recorded investment		155.7		155.7		160.9
With no related specific reserve, unpaid principal balance		200.5		200.5		204.8
With a related specific reserve, unpaid principal balance		9.2		9.2		1.4
Specific allowance		2.6		2.6		0.4
With no related specific reserve, average recorded investment	[1]	155.7	181.2	158.5	185.2
With a related specific reserve, average recorded investment	[1]	6.8	3.8	4.8	5.4
With no related specific reserve, interest income recognized		0.5	0.7	0.8	1.3
With a related specific reserve, interest income recognized		0.0	0.0	0.0	0.0
Personal | Private Client
Financing Receivable, Impaired [Line Items]
With no related specific reserve, recorded investment		0.8		0.8		0.2
With a related specific reserve, recorded investment		0.8		0.8		0.8
With no related specific reserve, recorded investment		0.8		0.8		0.2
With no related specific reserve, unpaid principal balance		0.8		0.8		0.5
With a related specific reserve, unpaid principal balance		0.8		0.8		0.8
Specific allowance		0.4		0.4		$ 0.4
With no related specific reserve, average recorded investment	[1]	0.6	0.7	0.4	0.7
With a related specific reserve, average recorded investment	[1]	0.8	0.5	0.8	0.3
With a related specific reserve, interest income recognized		$ 0.0	$ 0.0	$ 0.0	$ 0.0

[1] Average recorded investment in impaired loans is calculated as the average of the month-end impaired loan balances for the period.

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Variable Interest Entities - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Variable Interest Entity [Line Items]
Other Operating Activities, net				$ 265,400,000	$ (339,200,000)
Investment Funds
Variable Interest Entity [Line Items]
Exposure to loss from liquidity arrangements and obligations to purchase assets	$ 0	$ 0		0
Net assets held by the Funds	37,500,000,000	37,500,000,000		37,500,000,000
Pre-tax charge	45,800,000
Investment Funds | Constant Dollar Net Asset Value Investment Funds
Variable Interest Entity [Line Items]
Other Operating Activities, net	45,800,000
Net assets held by the Funds	1.00	1.00		1.00
Tax Credit Structures
Variable Interest Entity [Line Items]
Carrying amounts	187,300,000	187,300,000		187,300,000		$ 208,900,000
Exposure to loss from liquidity arrangements and obligations to purchase assets	0	0		0
Liabilities related to undrawn commitments	12,100,000	12,100,000		12,100,000		15,600,000
Affordable housing tax credits and other tax benefits		13,300,000	$ 13,900,000	26,500,000	$ 28,700,000
Leveraged Leasing Transactions
Variable Interest Entity [Line Items]
Carrying amounts	507,000,000	507,000,000		507,000,000		$ 547,600,000
Exposure to loss from liquidity arrangements and obligations to purchase assets	$ 0	$ 0		$ 0
Leveraged Leasing Transactions | Lower Limit
Variable Interest Entity [Line Items]
Funding of asset's cost via an equity interest	20.00%	20.00%	20.00%	20.00%	20.00%
Funding of asset's cost via third party non recourse debt holders	70.00%	70.00%	70.00%	70.00%	70.00%
Leveraged Leasing Transactions | Upper Limit
Variable Interest Entity [Line Items]
Funding of asset's cost via an equity interest	30.00%	30.00%	30.00%	30.00%	30.00%
Funding of asset's cost via third party non recourse debt holders	80.00%	80.00%	80.00%	80.00%	80.00%

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Changes in Allowance for Credit Losses by Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at Beginning of Period	$ 286.7	$ 309.4	$ 295.9	$ 307.9
Charge-Offs	(6.1)	(7.8)	(13.6)	(19.3)
Recoveries	3.5	1.9	6.4	11.9
Net (Charge-Offs) Recoveries	(2.6)	(5.9)	(7.2)	(7.4)
Provision for Credit Losses	(10.0)		(14.5)	3.0
Effect of Foreign Exchange Rates	0.1
Balance at End of Period	274.2	303.5	274.2	303.5
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at Beginning of Period	164.3	173.1	169.7	168.0
Charge-Offs	(2.5)	(2.1)	(5.2)	(6.3)
Recoveries	2.4	0.3	4.1	8.8
Net (Charge-Offs) Recoveries	(0.1)	(1.8)	(1.1)	2.5
Provision for Credit Losses	(11.6)	(2.6)	(15.9)	(1.8)
Effect of Foreign Exchange Rates	0.1
Balance at End of Period	152.7	168.7	152.7	168.7
Personal
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at Beginning of Period	122.4	136.3	126.2	139.9
Charge-Offs	(3.6)	(5.7)	(8.4)	(13.0)
Recoveries	1.1	1.6	2.3	3.1
Net (Charge-Offs) Recoveries	(2.5)	(4.1)	(6.1)	(9.9)
Provision for Credit Losses	1.6	2.6	1.4	4.8
Balance at End of Period	$ 121.5	$ 134.8	$ 121.5	$ 134.8

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Balances and Delinquency Status of Performing and Nonperforming Loans and Leases by Segment and Class as well as Total OREO and Nonperforming Asset Balances (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	$ 32,953.8	$ 31,640.2
Other Real Estate Owned	10.1	16.6
Total Nonperforming Assets	218.8	232.3
Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	15,304.9	14,353.6
Commercial | Commercial and Institutional
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	8,999.1	8,381.9
Commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	3,651.4	3,333.3
Commercial | Lease Financing, net
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	832.9	916.3
Commercial | Non-U.S.
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	1,533.1	1,530.6
Commercial | Other
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	288.4	191.5
Personal
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	17,648.9	17,286.6
Personal | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	9,369.0	9,782.6
Personal | Private Client
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	8,224.0	7,466.9
Personal | Other
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	55.9	37.1
Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Current	32,557.4	31,242.6
Total Loans and Leases	32,745.1	31,424.5
Performing Financing Receivable | Commercial
Financing Receivable, Recorded Investment [Line Items]
Current	15,125.2	14,253.2
Total Loans and Leases	15,255.5	14,301.5
Performing Financing Receivable | Commercial | Commercial and Institutional
Financing Receivable, Recorded Investment [Line Items]
Current	8,880.3	8,340.5
Total Loans and Leases	8,975.7	8,366.9
Performing Financing Receivable | Commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Current	3,590.5	3,274.3
Total Loans and Leases	3,625.4	3,296.2
Performing Financing Receivable | Commercial | Lease Financing, net
Financing Receivable, Recorded Investment [Line Items]
Current	832.9	916.3
Total Loans and Leases	832.9	916.3
Performing Financing Receivable | Commercial | Non-U.S.
Financing Receivable, Recorded Investment [Line Items]
Current	1,533.1	1,530.6
Total Loans and Leases	1,533.1	1,530.6
Performing Financing Receivable | Commercial | Other
Financing Receivable, Recorded Investment [Line Items]
Current	288.4	191.5
Total Loans and Leases	288.4	191.5
Performing Financing Receivable | Personal
Financing Receivable, Recorded Investment [Line Items]
Current	17,432.2	16,989.4
Total Loans and Leases	17,489.6	17,123.0
Performing Financing Receivable | Personal | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Current	9,196.0	9,556.3
Total Loans and Leases	9,210.8	9,620.2
Performing Financing Receivable | Personal | Private Client
Financing Receivable, Recorded Investment [Line Items]
Current	8,180.3	7,396.0
Total Loans and Leases	8,222.9	7,465.7
Performing Financing Receivable | Personal | Other
Financing Receivable, Recorded Investment [Line Items]
Current	55.9	37.1
Total Loans and Leases	55.9	37.1
Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	208.7	215.7
Nonperforming Financing Receivable | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	49.4	52.1
Nonperforming Financing Receivable | Commercial | Commercial and Institutional
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	23.4	15.0
Nonperforming Financing Receivable | Commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	26.0	37.1
Nonperforming Financing Receivable | Personal
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	159.3	163.6
Nonperforming Financing Receivable | Personal | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	158.2	162.4
Nonperforming Financing Receivable | Personal | Private Client
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	1.1	1.2
Financing Receivable, 30 to 59 Days Past Due | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Past Due	62.9	129.6
Financing Receivable, 30 to 59 Days Past Due | Performing Financing Receivable | Commercial
Financing Receivable, Recorded Investment [Line Items]
Past Due	24.9	24.1
Financing Receivable, 30 to 59 Days Past Due | Performing Financing Receivable | Commercial | Commercial and Institutional
Financing Receivable, Recorded Investment [Line Items]
Past Due	5.5	14.5
Financing Receivable, 30 to 59 Days Past Due | Performing Financing Receivable | Commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due	19.4	9.6
Financing Receivable, 30 to 59 Days Past Due | Performing Financing Receivable | Personal
Financing Receivable, Recorded Investment [Line Items]
Past Due	38.0	105.5
Financing Receivable, 30 to 59 Days Past Due | Performing Financing Receivable | Personal | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due	6.5	49.5
Financing Receivable, 30 to 59 Days Past Due | Performing Financing Receivable | Personal | Private Client
Financing Receivable, Recorded Investment [Line Items]
Past Due	31.5	56.0
Financing Receivable, 60 to 89 Days Past Due | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Past Due	109.9	29.6
Financing Receivable, 60 to 89 Days Past Due | Performing Financing Receivable | Commercial
Financing Receivable, Recorded Investment [Line Items]
Past Due	98.8	13.8
Financing Receivable, 60 to 89 Days Past Due | Performing Financing Receivable | Commercial | Commercial and Institutional
Financing Receivable, Recorded Investment [Line Items]
Past Due	87.5	4.0
Financing Receivable, 60 to 89 Days Past Due | Performing Financing Receivable | Commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due	11.3	9.8
Financing Receivable, 60 to 89 Days Past Due | Performing Financing Receivable | Personal
Financing Receivable, Recorded Investment [Line Items]
Past Due	11.1	15.8
Financing Receivable, 60 to 89 Days Past Due | Performing Financing Receivable | Personal | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due	6.4	9.9
Financing Receivable, 60 to 89 Days Past Due | Performing Financing Receivable | Personal | Private Client
Financing Receivable, Recorded Investment [Line Items]
Past Due	4.7	5.9
Financing Receivable, 90 Days and Greater Past Due | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Past Due	14.9	22.7
Financing Receivable, 90 Days and Greater Past Due | Performing Financing Receivable | Commercial
Financing Receivable, Recorded Investment [Line Items]
Past Due	6.6	10.4
Financing Receivable, 90 Days and Greater Past Due | Performing Financing Receivable | Commercial | Commercial and Institutional
Financing Receivable, Recorded Investment [Line Items]
Past Due	2.4	7.9
Financing Receivable, 90 Days and Greater Past Due | Performing Financing Receivable | Commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due	4.2	2.5
Financing Receivable, 90 Days and Greater Past Due | Performing Financing Receivable | Personal
Financing Receivable, Recorded Investment [Line Items]
Past Due	8.3	12.3
Financing Receivable, 90 Days and Greater Past Due | Performing Financing Receivable | Personal | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Past Due	1.9	4.5
Financing Receivable, 90 Days and Greater Past Due | Performing Financing Receivable | Personal | Private Client
Financing Receivable, Recorded Investment [Line Items]
Past Due	$ 6.4	$ 7.8

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Cash Flow Hedge Derivative Gains and Losses Recognized in AOCI and the Amounts Reclassified to Earnings (Detail) - Asset And Liability Management - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain/(Loss) Recognized in AOCI	$ 6.5	$ (1.3)	$ (1.4)	$ 1.1
Net Gain/(Loss) Reclassified from AOCI to Net Income	(2.6)	1.9	(4.7)	2.5
Interest Rate Option Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain/(Loss) Recognized in AOCI	(1.7)		1.5
Net Gain/(Loss) Reclassified from AOCI to Net Income	1.2		2.4
Net Gain/(Loss) Reclassified from AOCI to Net Income | Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other Operating Income	(2.3)	$ 1.9	(3.9)	2.7
Other Operating Expense	(0.3)		(0.8)	$ (0.2)
Net Gain/(Loss) Reclassified from AOCI to Net Income | Interest Rate Option Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Interest Income	$ 1.2		$ 2.4

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Allowance for Credit Losses (Tables)

6 Months Ended

Jun. 30, 2015

Changes in Allowance for Credit Losses by Segment

The following tables provide information regarding changes in the total allowance for credit losses by segment during the three and six months ended June 30, 2015 and 2014.

Table 46: Changes in the Allowance for Credit Losses

	Three Months Ended June 30,
	2015									2014
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	164.3		$	122.4		$	286.7		$	173.1		$	136.3		$	309.4
Charge-Offs		(2.5	)		(3.6	)		(6.1	)		(2.1	)		(5.7	)		(7.8	)
Recoveries		2.4			1.1			3.5			0.3			1.6			1.9
Net (Charge-Offs) Recoveries		(0.1	)		(2.5	)		(2.6	)		(1.8	)		(4.1	)		(5.9	)
Provision for Credit Losses		(11.6	)		1.6			(10.0	)		(2.6	)		2.6			—
Effect of Foreign Exchange Rates		0.1			—			0.1			—			—			—
Balance at End of Period	$	152.7		$	121.5		$	274.2		$	168.7		$	134.8		$	303.5

	Six Months Ended June 30,
	2015									2014
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	169.7		$	126.2		$	295.9		$	168.0		$	139.9		$	307.9
Charge-Offs		(5.2	)		(8.4	)		(13.6	)		(6.3	)		(13.0	)		(19.3	)
Recoveries		4.1			2.3			6.4			8.8			3.1			11.9
Net (Charge-Offs) Recoveries		(1.1	)		(6.1	)		(7.2	)		2.5			(9.9	)		(7.4	)
Provision for Credit Losses		(15.9	)		1.4			(14.5	)		(1.8	)		4.8			3.0
Effect of Foreign Exchange Rates		—			—			—			—			—			—
Balance at End of Period	$	152.7		$	121.5		$	274.2		$	168.7		$	134.8		$	303.5

Allowances for Credit Losses and Recorded Investments in Loans and Leases by Segment

The following table provides information regarding the balances of the recorded investments in loans and leases and the allowance for credit losses by segment as of June 30, 2015, and December 31, 2014.

Table 47: Information about the Recorded Investments in Loans and Leases

	June 30, 2015						December 31, 2014
(In Millions)	Commercial		Personal		Total		Commercial		Personal		Total
Loans and Leases
Specifically Evaluated for Impairment	$	52.7	$	166.3	$	219.0	$	78.9	$	163.3	$	242.2
Evaluated for Inherent Impairment		15,252.2		17,482.6		32,734.8		14,274.7		17,123.3		31,398.0
Total Loans and Leases		15,304.9		17,648.9		32,953.8		14,353.6		17,286.6		31,640.2
Allowance for Loans and Leases
Specifically Evaluated for Impairment		7.8		3.0		10.8		5.8		0.8		6.6
Evaluated for Inherent Impairment		131.2		115.3		246.5		138.0		122.4		260.4
Allowance Assigned to Loans and Leases		139.0		118.3		257.3		143.8		123.2		267.0
Allowance for Unfunded Exposures
Commitments and Standby Letters of Credit		13.7		3.2		16.9		25.9		3.0		28.9
Total Allowance for Credit Losses	$	152.7	$	121.5	$	274.2	$	169.7	$	126.2	$	295.9

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Book and Fair Values of All Financial Instruments (Detail) - USD ($) $ in Millions		Jun. 30, 2015		Dec. 31, 2014		Jun. 30, 2014	Dec. 31, 2013
Assets
Cash and Due from Banks		$ 7,152.9		$ 3,050.6		$ 3,945.2	$ 3,162.4
Federal Funds Sold and Resell Agreements		1,020.0		1,062.7
Interest-Bearing Deposits with Banks		15,650.3		14,928.3
Federal Reserve Deposits		17,488.7		17,386.3
Securities
Available for Sale		31,835.6		29,558.5
Held to Maturity		6,990.8		4,170.8
Trading Account		1.2		4.7
Loans (excluding Leases)
Client Security Settlement Receivables		2,034.2		1,568.8
Deposits
Savings Certificates and Other Time		1,540.5		1,757.4
Non U.S. Offices Interest-Bearing		52,909.9		47,545.0
Federal Funds Purchased		351.3		932.9
Securities Sold under Agreements to Repurchase		29.8		885.1
Other Borrowings		3,322.9		1,685.2
Senior Notes		1,497.2		1,497.0
Long Term Debt (excluding Leases)
Floating Rate Capital Debt		277.3		277.2
Asset And Liability Management
Derivative Instruments
Assets		137.5		251.7
Liabilities		85.4		48.7
Client Related and Trading
Derivative Instruments
Assets		2,547.8		4,255.0
Liabilities		2,509.8		4,173.3
Carrying (Reported) Amount, Fair Value Disclosure
Assets
Cash and Due from Banks		7,152.9		3,050.6
Federal Funds Sold and Resell Agreements		1,020.0		1,062.7
Interest-Bearing Deposits with Banks		15,650.3		14,928.3
Federal Reserve Deposits		17,488.7		17,386.3
Securities
Available for Sale		31,835.6	[1]	29,558.5	[2]
Held to Maturity		6,990.8		4,170.8
Trading Account		1.2		4.7
Loans (excluding Leases)
Held for Investment		31,863.4		30,458.0
Held for Sale		3.9		2.5
Client Security Settlement Receivables		2,034.2		1,568.8
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		178.1		207.5
Community Development Investments		187.4		209.9
Employee Benefit and Deferred Compensation		161.3		143.2
Deposits
Demand, Noninterest-Bearing, Savings and Money Market		46,237.5		41,454.6
Savings Certificates and Other Time		1,540.5		1,757.4
Non U.S. Offices Interest-Bearing		52,909.9		47,545.0
Federal Funds Purchased		351.3		932.9
Securities Sold under Agreements to Repurchase		29.8		885.1
Other Borrowings		3,322.9		1,685.2
Senior Notes		1,497.2		1,497.0
Long Term Debt (excluding Leases)
Subordinated Debt		1,330.1		1,583.3
Floating Rate Capital Debt		277.3		277.2
Other Liabilities
Standby Letters of Credit		43.5		60.1
Loan Commitments		25.6		28.3
Carrying (Reported) Amount, Fair Value Disclosure | Asset And Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets		30.8		125.7
Liabilities		58.7		23.5
Carrying (Reported) Amount, Fair Value Disclosure | Asset And Liability Management | Interest Rate Contracts
Derivative Instruments
Assets		107.7		126.8
Liabilities		27.4		30.5
Carrying (Reported) Amount, Fair Value Disclosure | Asset And Liability Management | Other Financial Derivatives
Derivative Instruments
Liabilities	[3]	11.3
Carrying (Reported) Amount, Fair Value Disclosure | Client Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets		2,451.3		4,149.5
Liabilities		2,416.7		4,072.0
Carrying (Reported) Amount, Fair Value Disclosure | Client Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets		96.5		105.5
Liabilities		93.1		101.3
Estimate of Fair Value, Fair Value Disclosure
Assets
Cash and Due from Banks		7,152.9		3,050.6
Federal Funds Sold and Resell Agreements		1,020.0		1,062.7
Interest-Bearing Deposits with Banks		15,650.3		14,928.3
Federal Reserve Deposits		17,488.7		17,386.3
Securities
Available for Sale		31,835.6	[1]	29,558.5	[2]
Held to Maturity		6,986.4		4,176.1
Trading Account		1.2		4.7
Loans (excluding Leases)
Held for Investment		32,022.3		30,600.4
Held for Sale		3.9		2.5
Client Security Settlement Receivables		2,034.2		1,568.8
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		178.1		207.5
Community Development Investments		186.2		210.8
Employee Benefit and Deferred Compensation		161.1		146.7
Deposits
Demand, Noninterest-Bearing, Savings and Money Market		46,237.5		41,454.6
Savings Certificates and Other Time		1,554.4		1,757.0
Non U.S. Offices Interest-Bearing		52,909.9		47,545.0
Federal Funds Purchased		351.3		932.9
Securities Sold under Agreements to Repurchase		29.8		885.1
Other Borrowings		3,325.2		1,686.2
Senior Notes		1,534.1		1,541.8
Long Term Debt (excluding Leases)
Subordinated Debt		1,338.3		1,583.4
Floating Rate Capital Debt		244.6		242.8
Other Liabilities
Standby Letters of Credit		43.5		60.1
Loan Commitments		25.6		28.3
Estimate of Fair Value, Fair Value Disclosure | Asset And Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets		30.8		125.7
Liabilities		58.7		23.5
Estimate of Fair Value, Fair Value Disclosure | Asset And Liability Management | Interest Rate Contracts
Derivative Instruments
Assets		107.7		126.8
Liabilities		27.4		30.5
Estimate of Fair Value, Fair Value Disclosure | Asset And Liability Management | Other Financial Derivatives
Derivative Instruments
Liabilities	[3]	11.3
Estimate of Fair Value, Fair Value Disclosure | Client Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets		2,451.3		4,149.5
Liabilities		2,416.7		4,072.0
Estimate of Fair Value, Fair Value Disclosure | Client Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets		96.5		105.5
Liabilities		93.1		101.3
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 1
Assets
Cash and Due from Banks		7,152.9		3,050.6
Securities
Available for Sale		5,018.8	[1]	4,506.9	[2]
Other Assets
Employee Benefit and Deferred Compensation		109.5		96.7
Deposits
Demand, Noninterest-Bearing, Savings and Money Market		46,237.5		41,454.6
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2
Assets
Federal Funds Sold and Resell Agreements		1,020.0		1,062.7
Interest-Bearing Deposits with Banks		15,650.3		14,928.3
Federal Reserve Deposits		17,488.7		17,386.3
Securities
Available for Sale		26,800.2	[1]	25,033.5	[2]
Held to Maturity		6,986.4		4,176.1
Trading Account		1.2		4.7
Loans (excluding Leases)
Client Security Settlement Receivables		2,034.2		1,568.8
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		178.1		207.5
Community Development Investments		186.2		210.8
Employee Benefit and Deferred Compensation		51.6		50.0
Deposits
Savings Certificates and Other Time		1,554.4		1,757.0
Non U.S. Offices Interest-Bearing		52,909.9		47,545.0
Federal Funds Purchased		351.3		932.9
Securities Sold under Agreements to Repurchase		29.8		885.1
Other Borrowings		3,325.2		1,686.2
Senior Notes		1,534.1		1,541.8
Long Term Debt (excluding Leases)
Subordinated Debt		1,338.3		1,583.4
Floating Rate Capital Debt		244.6		242.8
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2 | Asset And Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets		30.8		125.7
Liabilities		58.7		23.5
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2 | Asset And Liability Management | Interest Rate Contracts
Derivative Instruments
Assets		107.7		126.8
Liabilities		27.4		30.5
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2 | Client Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets		2,451.3		4,149.5
Liabilities		2,416.7		4,072.0
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2 | Client Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets		96.5		105.5
Liabilities		93.1		101.3
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 3
Securities
Available for Sale		16.6	[1]	18.1	[2]
Loans (excluding Leases)
Held for Investment		32,022.3		30,600.4
Held for Sale		3.9		2.5
Other Liabilities
Standby Letters of Credit		43.5		60.1
Loan Commitments		25.6		$ 28.3
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 3 | Asset And Liability Management | Other Financial Derivatives
Derivative Instruments
Liabilities	[3]	$ 11.3

[1] Refer to the table located on page 39 for the disaggregation of available for sale securities.

[2] Refer to the table located on page 40 for the disaggregation of available for sale securities.

[3] This line includes a swap related to the sale of certain Visa Class B common shares.

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Net Income Per Common Share Computations

6 Months Ended

Jun. 30, 2015

Net Income Per Common Share Computations

13. Net Income Per Common Share Computations — The computations of net income per common share are presented in the following table.

Table 54: Net Income per Common Share

	Three Months Ended June 30,				Six Months Ended June 30,
($ In Millions Except Per Common Share Information)	2015		2014		2015		2014
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding		233,149,020		236,012,703		233,264,453		236,607,125
Net Income	$	269.2	$	181.9	$	499.9	$	363.3
Less: Dividends on Preferred Stock		5.8		—		11.7		—
Net Income Applicable to Common Stock		263.4		181.9		488.2		363.3
Less: Earnings Allocated to Participating Securities		4.1		3.1		7.8		6.0
Earnings Allocated to Common Shares Outstanding		259.3		178.8		480.4		357.3
Basic Net Income Per Common Share	$	1.11	$	0.76	$	2.06	$	1.51
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding		233,149,020		236,012,703		233,264,453		236,607,125
Plus: Dilutive Effect of Share-based Compensation		2,083,815		1,740,976		1,996,158		1,791,489
Average Common and Potential Common Shares		235,232,835		237,753,679		235,260,611		238,398,614
Earnings Allocated to Common and Potential Common Shares	$	259.3	$	178.8	$	480.4	$	357.3
Diluted Net Income Per Common Share		1.10		0.75		2.04		1.50

Note: For the three months ended June 30, 2015, there were no common stock equivalents excluded in the computation of diluted net income per common share. Common stock equivalents of 748,268 for the six months ended June 30, 2015, and 1,981,304 and 1,980,947 for the three and six months ended June 30, 2014, respectively, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive.

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Variable Interest Entities

6 Months Ended

Jun. 30, 2015

Variable Interest Entities

18. Variable Interest Entities — Variable Interest Entities (VIEs) are defined within GAAP as entities that 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. 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 these VIEs given it lacks the power to direct the activities that most significantly impact the economic performance of the VIEs.

Northern Trust’s maximum exposure to loss as a result of its involvement with the leveraged lease trust VIEs is limited to the carrying amounts of its leveraged lease investments. As of June 30, 2015, and December 31, 2014, the carrying amounts of these investments, which are included in loans and leases in the consolidated balance sheets, were $507.0 million and $547.6 million, respectively. Northern Trust’s funding requirements relative to the VIEs are limited to its invested capital. Northern Trust has no other liquidity arrangements or obligations to purchase assets of the 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 LLCs in which Northern Trust invests as a limited partner/investor member through equity contributions. The economic performance of the community development projects, 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 projects 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 VIEs.

Northern Trust’s maximum exposure to loss as a result of its involvement with community development projects is limited to the carrying amount of its investments, including any undrawn commitments. As of June 30, 2015, and December 31, 2014, the carrying amount of investments in community development projects that generate tax credits, included in other assets in the consolidated balance sheets, totaled $187.3 million and $208.9 million, respectively. As of June 30, 2015, and December 31, 2014, liabilities related to undrawn commitments on investments in tax credit community development projects, included in other liabilities in the consolidated balance sheets, totaled $12.1 million and $15.6 million, 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.

Affordable housing tax credits and other tax benefits attributable to community development projects totaled $13.3 million and $13.9 million, respectively, for the three months ended June 30, 2015 and 2014, and $26.5 million and $28.7 million, respectively, for the six months ended June 30, 2015 and 2014.

Trust Preferred Securities. In 1997, Northern Trust issued Floating Rate Capital Securities, Series A and Series B, through NTC Capital I and NTC Capital II, respectively, statutory business trusts wholly-owned by the Corporation. The sole assets of the trusts are subordinated debentures of the Corporation that have the same interest rates and maturity dates as the corresponding distribution rates and redemption dates of the Floating Rate Capital Securities. NTC Capital I and NTC Capital II are considered VIEs; however, as the sole asset of each trust is a receivable from the Corporation and proceeds to the Corporation from the receivable exceed the Corporation’s investment in the VIEs’ equity shares, the Corporation is not permitted to consolidate the trusts, even though the Corporation owns all of the voting equity shares of the trusts, has fully guaranteed the trusts’ obligations and has the right to redeem the preferred securities in certain circumstances. Northern Trust recognizes the subordinated debentures in its consolidated balance sheets as long-term liabilities.

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.

In June 2015, Northern Trust voluntarily elected to contribute an aggregate $45.8 million of cash to four constant-dollar-net-asset-value investment funds (Funds) for which it serves as asset manager to bring the net asset values of such funds to $1.00. The contributions, which were recorded to other operating expense in the consolidated statements of income, resulted in a pre-tax charge of $45.8 million. As of June 30, 2015 the net assets held by the Funds totaled $37.5 billion.

Under GAAP, the contributions noted above are deemed to reflect Northern Trust’s implicit interest in the credit risk of the Funds, which must be considered when determining whether it is the primary beneficiary of the Funds. In determining whether Northern Trust is the primary beneficiary of the Funds, Northern Trust used an expected loss calculation based on the characteristics of the underlying investments in the Funds to estimate the expected losses related to interest rate and credit risk, and also considered the relative rights and obligations of each of the applicable variable interest holders. Upon consideration of this analysis, Northern Trust determined that it is not the primary beneficiary of the Funds, as interest rate risk was determined to be the primary driver of expected losses within such funds. Similarly, based on its analysis, including consideration of the contributions noted above, Northern Trust has also determined that it is not the primary beneficiary of any other investment funds for which it serves as asset manager under GAAP. Accordingly, Northern Trust is not required to consolidate the Funds or any other investment funds for which it serves as asset manager within its consolidated balance sheets.

Any potential future support of the Funds will be at the discretion of Northern Trust after an evaluation of the specific facts and circumstances and with careful consideration as to the potential impact on Northern Trust’s regulatory capital levels and other operational needs. As of June 30, 2015, Northern Trust has no exposure to loss from its implicit interest in such Funds as there are no current plans to provide any further support to the Funds.

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Gains and Losses Recorded in Consolidated Statements of Income related to Derivative Instruments Not Formally Designated as Hedges (Detail) - Nondesignated - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income		$ (4.7)	$ 1.5	$ (13.4)	$ 0.8
Foreign Exchange Contracts | Others Operating Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income		6.6	$ 1.5	(2.1)	$ 0.8
Other Financial Derivatives | Others Operating Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	[1]	$ (11.3)		$ (11.3)

[1] This line includes a swap related to sale of certain Visa Class B common shares.

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Changes in Level 3 Liabilities (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Liabilities Beginning Balance					$ 55.4
Total (Gains) Losses:
Included in Earnings	[1]				(0.1)
Included in Other Comprehensive Income		$ 0.0	$ 0.0	$ 0.0	0.0
Purchases, Issues, Sales, and Settlements
Purchases		0.0	0.0	0.0	0.0
Settlements					(55.3)
Swap Related to Sale of Certain Visa Class B Common Shares
Total (Gains) Losses:
Included in Earnings	[1]	11.3		11.3
Included in Other Comprehensive Income		0.0	0.0	0.0	0.0
Purchases, Issues, Sales, and Settlements
Purchases		0.0	$ 0.0	0.0	$ 0.0
Fair Value Liabilities Ending Balance		$ 11.3		$ 11.3

[1] (Gains) losses are recorded in other operating income (expense) in the consolidated statements of income.

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Share-Based Compensation Plans (Tables)

6 Months Ended

Jun. 30, 2015

Compensation Expense for Share-Based Payment Arrangements and Associated Tax Impacts

Total compensation expense for share-based payment arrangements and the associated tax impacts were as follows for the three and six months ended June 30, 2015 and 2014.

Table 57: Total Compensation Expense for Share-Based Payment Arrangements

	Three Months Ended June 30,				Six Months Ended June 30,
(In Millions)	2015		2014		2015		2014
Restricted Stock Unit Awards	$	13.4	$	14.9	$	26.9	$	29.0
Stock Options		1.7		2.1		7.7		8.5
Performance Stock Units		4.1		3.2		7.5		5.8
Total Share-Based Compensation Expense		19.2		20.2		42.1		43.3
Tax Benefits Recognized	$	7.2	$	7.5	$	15.8	$	16.2

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Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Income	$ 269.2	$ 181.9	$ 499.9	$ 363.3
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)
Net Unrealized Gains (Losses) on Securities Available for Sale	(22.4)	33.5	31.7	38.0
Net Unrealized Gains (Losses) on Cash Flow Hedges	3.2	(0.6)	2.1	1.0
Foreign Currency Translation Adjustments	5.8	(5.6)	(0.1)	(6.9)
Pension and Other Postretirement Benefit Adjustments	6.1	3.6	12.3	7.0
Other Comprehensive Income (Loss)	(7.3)	30.9	46.0	39.1
Comprehensive Income	$ 261.9	$ 212.8	$ 545.9	$ 402.4

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Notional and Fair Value Amounts of Client-related and Trading Derivative Financial Instruments (Detail) - Client Related and Trading - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Notional Value	$ 270,540.1	$ 262,922.5
Fair Value Asset	2,547.8	4,255.0
Fair Value Liability	2,509.8	4,173.3
Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	264,964.1	257,568.7
Fair Value Asset	2,451.3	4,149.5
Fair Value Liability	2,416.7	4,072.0
Interest Rate Contracts
Derivative [Line Items]
Notional Value	5,576.0	5,353.8
Fair Value Asset	96.5	105.5
Fair Value Liability	$ 93.1	$ 101.3

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Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2015

Recent Accounting Pronouncements

2. Recent Accounting Pronouncements — In May 2014, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2014-09, “Revenue from Contracts with Customers (Topic 606).” The ASU is a converged standard between the FASB and the International Accounting Standards Board (IASB) that provides a single comprehensive revenue recognition model for all contracts with customers across transactions and industries. The primary objective of the ASU is revenue recognition that represents the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The ASU is effective for interim and annual reporting periods beginning after December 15, 2017. Northern Trust is currently assessing the impact of adoption of ASU 2014-09.

In February 2015, the FASB issued ASU No. 2015-02, “Consolidation (Topic 810): Amendments to the Consolidation Analysis” which changes the guidance with respect to the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. The amendments include: (1) modifying the evaluation of limited partnerships and similar legal entities, (2) amending when fees paid to a decision maker should be included in the variable interest entity analysis, (3) amending the related party relationship guidance, and (4) providing a scope exception from the consolidation guidance for reporting entities with interests in certain investment funds. The ASU is effective for interim and annual reporting periods beginning after December 15, 2015, although early adoption is permitted. Northern Trust is currently assessing the impact of adoption of ASU 2015-02.

In April 2015, the FASB issued ASU No. 2015-03, “Interest — Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs” which requires that debt issuance costs be presented in the balance sheet as a direct deduction to the carrying amount of the associated debt liability. The ASU is effective for interim and annual periods beginning after December 15, 2015, although early adoption is permitted. Northern Trust is currently assessing the impact of adoption of ASU 2015-03.

In April 2015, the FASB issued ASU No. 2015-05, “Intangibles — Goodwill and Other — Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement” which clarifies whether fees paid by a customer in a cloud computing arrangement pertain to the acquisition of a software license, services, or both. The ASU is effective for interim and annual periods beginning after December 15, 2015, although early adoption is permitted. Northern Trust is currently assessing the impact of adoption of ASU 2015-05.

In May 2015, the FASB issued ASU No. 2015-07, “Fair Value Measurement (Topic 820) — Disclosures for Investments in Certain Entities that Calculate Net Asset Value per Share (or Its Equivalent)” which removes the requirement to categorize within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. Further, the ASU requires entities to provide certain disclosures only for investments for which they elect to use the net asset value practical expedient to determine fair value. The ASU is effective for interim and annual periods beginning after December 15, 2015, and will be applied retrospectively to all periods presented. Early adoption is permitted. Northern Trust is currently assessing the impact of adoption of ASU 2015-07.

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Credit-Related Losses Recognized in Earnings on Debt Securities Other-Than-Temporarily Impaired (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Cumulative Credit-Related Losses on Securities Held - Beginning of Period	$ 5.2	$ 12.7	$ 5.2	$ 8.8
Plus: Losses on Newly Identified Impairments				1.8
Additional Losses on Previously Identified Impairments				2.1
Less: Current and Prior Period Losses on Securities Sold During the Period	0.0	0.0	0.0	0.0
Cumulative Credit-Related Losses on Securities Held - End of Period	$ 5.2	$ 12.7	$ 5.2	$ 12.7

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Taxes [Line Items]
Income tax expense	$ 142.2	$ 88.8	$ 261.5	$ 176.9
Effective tax rate	34.60%	32.80%	34.40%	32.80%

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Changes by Reporting Segment in Carrying Amounts of Goodwill, including Effect of Foreign Exchange Rates on Non-U.S.-Dollar-Denominated Balances (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Goodwill [Line Items]
Total Goodwill	$ 534.3	$ 533.2
Corporate & Institutional Services
Goodwill [Line Items]
Total Goodwill	462.9	461.8
Wealth Management
Goodwill [Line Items]
Total Goodwill	$ 71.4	$ 71.4

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Contingent Liabilities

6 Months Ended

Jun. 30, 2015

Contingent Liabilities

19. 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 $36.4 billion and $35.1 billion as of June 30, 2015, and December 31, 2014, 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 were $4.2 billion and $4.5 billion as of June 30, 2015, and December 31, 2014, respectively.

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 Counterparty Risk Management 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 June 30, 2015, and December 31, 2014, subject to indemnification was $105.5 billion and $98.1 billion, respectively. Because of the credit quality of the borrowers and the requirement to collateralize fully securities borrowed, management believes that the exposure to credit loss from this activity is not significant and no liability was recorded as of June 30, 2015, or December 31, 2014, related to these indemnifications.

Legal Proceedings. In the normal course of business, the Corporation and its subsidiaries are routinely defendants in or parties to a number of pending and threatened legal actions, including, but not limited to, actions brought on behalf of various claimants or classes of claimants, regulatory matters, employment matters and challenges from tax authorities regarding the amount of taxes due. In certain of these actions and proceedings, claims for substantial monetary damages or adjustments to recorded tax liabilities are asserted.

Based on current knowledge, after consultation with legal counsel and after taking into account current accruals, management does not believe that losses, if any, arising from pending litigation or threatened legal actions or regulatory matters 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.”

For the reasons set out in this paragraph, the outcome of some matters is inherently difficult to predict and/or the range of loss cannot be reasonably estimated. This may be the case in 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 the 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 June 30, 2015, the Corporation has estimated the upper end of the range of reasonably possible losses for these matters to be approximately $125 million in the aggregate. This aggregate amount 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 will vary significantly from the current estimate.

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

A number of participants in Northern Trust’s securities lending program, which is associated with its asset servicing business, have commenced either individual lawsuits or purported class actions in which they claim, among other things, that Northern Trust failed to exercise prudence in the investment management of the collateral received from the borrowers of the securities, resulting in losses that they seek to recover. The cases assert various contractual, statutory and common law claims, including claims for breach of fiduciary duty under common law and under the Employee Retirement Income Security Act (ERISA). In 2013, Northern Trust recorded a $19.2 million pre-tax charge in connection with an agreement to resolve certain claims related to two of these lawsuits, the settlement of which remains pending while awaiting court approval. Other lawsuits and claims related to securities lending are not part of the proposed settlement, and remain pending.

As previously disclosed in April 2014, Northern Trust remains subject to an investigation by the U.S. Securities and Exchange Commission (SEC) related to Northern Trust’s securities lending activities. Northern Trust continues to cooperate with the SEC in this investigation.

In January 2015, the Public Prosecutor’s Office of France recommended that certain charges be brought against Northern Trust Fiduciary Services (Guernsey) Limited (NTFS), an indirect subsidiary of the Corporation, relating to the administration of two trusts for which NTFS serves as trustee. In April 2015, a French investigating magistrate judge charged NTFS with complicity in estate tax fraud. NTFS will contest the criminal charge in the French court. 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 the covered litigation noted below, 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.

Certain members of Visa U.S.A. are obligated to indemnify Visa for losses resulting from certain litigation relating to interchange fees (the covered litigation). On October 19, 2012, Visa signed a settlement agreement with plaintiff representatives for binding settlement of the covered litigation. On January 14, 2014, the trial court entered a final judgment order approving the settlement with the class plaintiffs, which is subject to appeal. A number of objectors have appealed from that order and more than 30 opt-out cases have been filed by merchants in various federal district courts. The ultimate resolution of the covered litigation and the timing for removal of the selling restrictions on the Visa Class B common shares are uncertain.

In the quarter ended June 30, 2015, Northern Trust recorded a $99.9 million net pre-tax gain on the sale of 1.0 million of its Visa Class B common shares. This sale does 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. As of June 30, 2015, Northern Trust continued to hold approximately 5.2 million Visa Class B common shares, which are recorded at their original cost basis of zero.

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Stockholders' Equity - Additional Information (Detail) - USD ($)		3 Months Ended	6 Months Ended	12 Months Ended
	Apr. 21, 2015	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Stockholders Equity Note [Line Items]
Preferred stock, shares authorized		10,000,000	10,000,000	10,000,000
Preferred stock, without par value		$ 0	$ 0	$ 0
Preferred stock		$ 388,500,000	$ 388,500,000	$ 388,500,000
Stock repurchase, shares		1,295,263	2,851,133
Average price paid per share for common stock repurchased		$ 74.64	$ 71.52
Stock repurchase, aggregate cost		$ 96,700,000	$ 203,900,000
Stock repurchase authorized, remaining shares		13,704,737	13,704,737
Upper Limit
Stockholders Equity Note [Line Items]
Stock repurchase authorized shares		15,000,000	15,000,000
After June 30 2015 through June 2016 | Upper Limit
Stockholders Equity Note [Line Items]
Stock Repurchase Authorized Amount		$ 578,300,000	$ 578,300,000
Series C Preferred Stock
Stockholders Equity Note [Line Items]
Stock issued during period			16,000,000	16,000,000
Per share ownership interest, percentage		0.10%	0.10%	0.10%
Preferred stock, without par value		$ 0	$ 0	$ 0
Preferred stock, liquidation preference		$ 25,000	$ 25,000	$ 25,000
Depository shares, liquidation preference per share		$ 25	$ 25	$ 25
Preferred stock		$ 388,500,000	$ 388,500,000	$ 388,500,000
Preferred stock, annual dividend rate			5.85%
Preferred Stock, Dividends Per Share, Declared	$ 365.625
Dividends Payable, Date to be Paid	Jul. 01, 2015
Dividends Payable, Date of Record	Jun. 15, 2015

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Net Income Per Common Share Computations (Tables)

6 Months Ended

Jun. 30, 2015

Computations of Net Income per Common Share

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

Table 54: Net Income per Common Share

	Three Months Ended June 30,				Six Months Ended June 30,
($ In Millions Except Per Common Share Information)	2015		2014		2015		2014
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding		233,149,020		236,012,703		233,264,453		236,607,125
Net Income	$	269.2	$	181.9	$	499.9	$	363.3
Less: Dividends on Preferred Stock		5.8		—		11.7		—
Net Income Applicable to Common Stock		263.4		181.9		488.2		363.3
Less: Earnings Allocated to Participating Securities		4.1		3.1		7.8		6.0
Earnings Allocated to Common Shares Outstanding		259.3		178.8		480.4		357.3
Basic Net Income Per Common Share	$	1.11	$	0.76	$	2.06	$	1.51
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding		233,149,020		236,012,703		233,264,453		236,607,125
Plus: Dilutive Effect of Share-based Compensation		2,083,815		1,740,976		1,996,158		1,791,489
Average Common and Potential Common Shares		235,232,835		237,753,679		235,260,611		238,398,614
Earnings Allocated to Common and Potential Common Shares	$	259.3	$	178.8	$	480.4	$	357.3
Diluted Net Income Per Common Share		1.10		0.75		2.04		1.50

Note: For the three months ended June 30, 2015, there were no common stock equivalents excluded in the computation of diluted net income per common share. Common stock equivalents of 748,268 for the six months ended June 30, 2015, and 1,981,304 and 1,980,947 for the three and six months ended June 30, 2014, respectively, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive.

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Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2015

Accumulated Other Comprehensive Income (Loss)

12. Accumulated Other Comprehensive Income (Loss) — The following tables summarize the components of accumulated other comprehensive income (loss) (AOCI) at June 30, 2015 and 2014, and changes during the three- and six-month periods then ended.

Table 51: Summary of Changes in Accumulated Other Comprehensive Income (Loss)

(In Millions)	Balance at June 30, 2015			Net Change			Balance at December 31, 2014
Net Unrealized Gains (Losses) on Securities Available for Sale	$	59.3		$	31.7		$	27.6
Net Unrealized Gains (Losses) on Cash Flow Hedges		(2.6	)		2.1			(4.7	)
Net Foreign Currency Adjustments		(1.8	)		(0.1	)		(1.7	)
Net Pension and Other Postretirement Benefit Adjustments		(328.6	)		12.3			(340.9	)
Total	$	(273.7	)	$	46.0		$	(319.7	)

(In Millions)	Balance at June 30, 2014			Net Change			Balance at December 31, 2013
Net Unrealized Gains (Losses) on Securities Available for Sale	$	44.0		$	38.0		$	6.0
Net Unrealized Gains (Losses) on Cash Flow Hedges		3.9			1.0			2.9
Net Foreign Currency Adjustments		0.2			(6.9	)		7.1
Net Pension and Other Postretirement Benefit Adjustments		(253.3	)		7.0			(260.3	)
Total	$	(205.2	)	$	39.1		$	(244.3	)

Table 52: Details of Changes in Accumulated Other Comprehensive Income (Loss)

	Three Months Ended June 30,
	2015									2014
(In Millions)	Before Tax			Tax Effect			After Tax			Before Tax			Tax Effect			After Tax
Unrealized Gains (Losses) on Securities Available for Sale
Noncredit-Related Unrealized Losses on Securities OTTI	$	—		$	—		$	—		$	(3.3	)	$	1.3		$	(2.0	)
Other Unrealized Gains (Losses) on Securities Available for Sale		(36.4	)		13.8			(22.6	)		57.3			(21.4	)		35.9
Reclassification Adjustment for (Gains) Losses Included in Net Income		0.4			(0.2	)		0.2			(0.4	)		—			(0.4	)
Net Change		(36.0	)		13.6			(22.4	)		53.6			(20.1	)		33.5
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		4.8			(2.4	)		2.4			(1.3	)		0.6			(0.7	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		1.3			(0.5	)		0.8			0.2			(0.1	)		0.1
Net Change		6.1			(2.9	)		3.2			(1.1	)		0.5			(0.6	)
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		53.0			2.4			55.4			13.4			(0.3	)		13.1
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)		1.5			(0.5	)		1.0			(1.0	)		0.4			(0.6	)
Net Investment Hedge Gains (Losses)		(81.1	)		30.5			(50.6	)		(29.6	)		11.5			(18.1	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		(26.6	)		32.4			5.8			(17.2	)		11.6			(5.6	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		9.7			(3.6	)		6.1			6.1			(2.5	)		3.6
Net Change	$	9.7		$	(3.6	)	$	6.1		$	6.1		$	(2.5	)	$	3.6

	Six Months Ended June 30,
	2015									2014
(In Millions)	Before Tax			Tax Effect			After Tax			Before Tax			Tax Effect			After Tax
Unrealized Gains (Losses) on Securities Available for Sale
Noncredit-Related Unrealized Losses on Securities OTTI	$	—		$	—		$	—		$	(1.8	)	$	0.7		$	(1.1	)
Other Unrealized Gains (Losses) on Securities Available for Sale		50.4			(18.9	)		31.5			63.0			(23.6	)		39.4
Reclassification Adjustment for (Gains) Losses Included in Net Income		0.3			(0.1	)		0.2			(0.3	)		—			(0.3	)
Net Change		50.7			(19.0	)		31.7			60.9			(22.9	)		38.0
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		0.1			0.6			0.7			1.1			(0.3	)		0.8
Reclassification Adjustment for (Gains) Losses Included in Net Income		2.3			(0.9	)		1.4			0.4			(0.2	)		0.2
Net Change		2.4			(0.3	)		2.1			1.5			(0.5	)		1.0
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		(37.1	)		14.6			(22.5	)		19.9			(1.2	)		18.7
Long-Term Intra-Entity Foreign Currency Transaction Gains (Losses)		0.5			(0.2	)		0.3			(1.6	)		0.6			(1.0	)
Net Investment Hedge Gains (Losses)		35.5			(13.4	)		22.1			(40.2	)		15.6			(24.6	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		(1.1	)		1.0			(0.1	)		(21.9	)		15.0			(6.9	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		19.2			(6.9	)		12.3			12.5			(5.5	)		7.0
Net Change	$	19.2		$	(6.9	)	$	12.3		$	12.5		$	(5.5	)	$	7.0

The following table provides the location and before-tax amounts of reclassifications out of AOCI during the three and six months ended June 30, 2015.

Table 53: Reclassification Adjustment out of Accumulated Other Comprehensive Income (Loss)

(In Millions)	Location of Reclassification Adjustments Recognized in Income	Amount of Reclassification Adjustments Recognized in Income
		Three Months Ended		Six Months Ended
		June 30, 2015
Securities Available for Sale
Realized (Gains) Losses on Securities Available for Sale	Investment Security Gains (Losses), net	$	0.4	$	0.3
Realized (Gains) Losses on Cash Flow Hedges
Foreign Exchange Contracts	Other Operating Income/Expense		1.3		2.3
Pension and Other Postretirement Benefit Adjustments
Amortization of Net Actuarial (Gain) Loss	Employee Benefits		9.7		19.3
Amortization of Prior Service Cost	Employee Benefits		—		(0.1	)
Gross Reclassification Adjustment		$	9.7	$	19.2