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 September 30, 2014

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	¨	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

235,505,008 Shares – $1.66 2/3 Par Value

(Shares of Common Stock Outstanding on September 30, 2014)

NORTHERN TRUST CORPORATION

QUARTERLY REPORT ON FORM 10-Q

FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 2014

TABLE OF CONTENTS

	Page
Consolidated Financial Highlights (unaudited)		2
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)		29
Consolidated Balance Sheet		29
Consolidated Statement of Income		30
Consolidated Statement of Comprehensive Income		30
Consolidated Statement of Changes in Stockholders’ Equity		31
Consolidated Statement of Cash Flows		32
Notes to Consolidated Financial Statements		33
Item 4: Controls and Procedures		77
Part II – Other Information
Item 1: Legal Proceedings		77
Item 2: Unregistered Sales of Equity Securities and Use of Proceeds		77
Item 6: Exhibits		78

1

CONSOLIDATED FINANCIAL HIGHLIGHTS

(UNAUDITED)

CONDENSED INCOME STATEMENT (In Millions)	Three Months Ended September 30,									Nine Months Ended September 30,
	2014			2013			% Change (*)			2014			2013			% Change (*)
Noninterest Income	$	829.6		$	810.2			2	%	$	2,459.5		$	2,360.9			4	%
Net Interest Income		249.3			237.0			5			741.6			683.2			9
Provision for Credit Losses		—			5.0			(100	)		3.0			15.0			(80	)
Noninterest Expense		774.7			740.7			5			2,353.7			2,199.3			7
Income before Income Taxes		304.2			301.5			1			844.4			829.8			2
Provision for Income Taxes		99.7			95.0			5			276.6			268.2			3
Net Income	$	204.5		$	206.5			(1	)%	$	567.8		$	561.6			1	%
PER COMMON SHARE
Net Income — Basic	$	0.85		$	0.85			—	%	$	2.36		$	2.31			2	%
— Diluted		0.84			0.84			—			2.34			2.29			2
Cash Dividends Declared Per Common Share		0.33			0.31			6			0.97			0.92			5
Book Value — End of Period (EOP)		34.62			32.71			6			34.62			32.71			6
Market Price — EOP		68.03			54.38			25			68.03			54.38			25
SELECTED BALANCE SHEET DATA (In Millions)
	September 30,			December 31,
	2014			2013			% Change (*)
End of Period:
Assets	$	111,153.7		$	102,947.3			8	%
Earning Assets		101,133.8			93,367.2			8
Deposits		91,722.5			84,098.1			9
Stockholders’ Equity		8,542.6			7,912.0			8
	Three Months Ended September 30,									Nine Months Ended September 30,
	2014			2013			% Change (*)			2014			2013			% Change (*)
Average Balances:
Assets	$	105,244.7		$	95,212.5			11	%	$	102,955.8		$	93,223.5			10	%
Earning Assets		96,967.5			85,529.1			13			94,773.8			83,615.3			13
Deposits		85,717.2			75,454.4			14			83,721.6			74,069.2			13
Stockholders’ Equity		8,285.5			7,697.8			8			8,054.3			7,630.3			6
SELECTED RATIOS AND METRICS
	Three Months Ended September 30,									Nine Months Ended September 30,
	2014			2013			% Change (*)			2014			2013			% Change (*)
Financial Ratios:
Return on Average Common Equity		10.09	%		10.64	%		(5	)%		9.52	%		9.84	%		(3	)%
Return on Average Assets		0.77			0.86			(10	)		0.74			0.81			(9	)
Dividend Payout Ratio		39.3			36.9			6			41.5			40.2			3
Net Interest Margin (**)		1.05			1.14			(8	)		1.08			1.13			(4	)

	September 30, 2014						June 30, 2014
	Advanced Approach (a)			Standardized Approach (b)			Advanced Approach (a)			Standardized Approach (b)			December 31, 2013 (c)
Capital Ratios:
Northern Trust Corporation
Common Equity Tier 1		12.7	%		12.8	%		12.7	%		12.7	%		12.9	%
Tier 1		13.4			13.6			12.9			12.9			13.4
Total		15.3			16.0			14.9			15.4			15.8
Leverage		n/a			7.9			n/a			7.6			7.9
The Northern Trust Company
Common Equity Tier 1		11.7	%		11.6	%		11.7	%		11.4	%		11.5	%
Tier 1		11.7			11.6			11.6			11.4			11.5
Total		13.7			14.0			13.7			14.0			14.3
Leverage		n/a			6.8			n/a			6.7			6.8
CLIENT ASSETS (In Billions)				September 30, 2014			December 31, 2013			% Change (*)
Assets Under Custody				$	5,910.3		$	5,575.7			6	%
Assets Under Management					923.3			884.5			4

(*) 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 basis (FTE).

(a) Effective with the second quarter of 2014, Northern Trust exited its parallel run. Accordingly, the September 30, 2014, and June 30, 2014, ratios are calculated in compliance with the Basel III Advanced Approach final rules released by the Board of Governors of the Federal Reserve on July 2, 2013.

(b) Standardized Approach capital components in 2014 are determined by Basel III phased in requirements and risk weighted assets are determined by Basel I requirements. The September 30, 2014, and June 30, 2014, ratios calculated under the Standardized Approach comply with the final rules released by the Board of Governors of the Federal Reserve on July 2, 2013.

(c) The December 31, 2013 ratios are calculated in accordance with Basel I requirements.

2

PART I – FINANCIAL INFORMATION

ITEMS 2. AND 3. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS

General

Northern Trust Corporation (the Corporation), together with its subsidiaries, is a leading provider of asset servicing, fund administration, asset management, fiduciary and banking solutions for corporations, institutions, families, and individuals worldwide. Northern Trust focuses on servicing and managing client assets through its two primary business units, Wealth Management (WM) and Corporate & Institutional Services (C&IS). Asset management and related services are provided to Wealth Management and C&IS clients primarily by a third business unit, Asset Management. The Corporation conducts business through various U.S. and non-U.S. subsidiaries, including through its principal subsidiary, The Northern Trust Company. Except where the context otherwise requires, the term “Northern Trust” refers to Northern Trust 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 should also read the section entitled “Forward-Looking Statements.”

Overview

Net income per diluted common share in the current quarter was $0.84, consistent with $0.84 in the third quarter of 2013. Net income was $204.5 million as compared to $206.5 million in the prior year quarter. The performance in the current quarter produced an annualized return on average common equity of 10.1% as compared to 10.6% in the prior year quarter. The annualized return on average assets was 0.8% as compared to 0.9% in the prior year quarter.

The prior year quarter included a $32.6 million pre-tax gain ($20.3 million after tax, or $0.08 per common share) on the sale of an office building property. Excluding this gain, net income per diluted common share, net income, and return on average common equity in the prior year quarter were $0.76, $186.2 million, and 9.6%, respectively.

Revenue of $1.08 billion was up $31.7 million, or 3%, from $1.05 billion in the prior year quarter. Noninterest income increased $19.4 million, or 2%, to $829.6 million from the prior year quarter’s $810.2 million. Excluding the prior year quarter gain on the sale of an office building property, noninterest income increased $52.0 million, or 7%, reflecting higher trust, investment and other servicing fees, partially offset by lower foreign exchange trading income as compared to the prior year quarter.

Net interest income increased $12.3 million, or 5%, to $249.3 million as compared to $237.0 million in the prior year quarter, due to higher levels of average earning assets, partially offset by a decrease in the net interest margin.

Noninterest expense totaled $774.7 million, up $34.0 million, or 5%, from $740.7 million in the prior year quarter, primarily reflecting higher compensation, employee benefits and equipment and software expense.

3

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Income

The components of noninterest income are provided below.

Noninterest Income	Three Months Ended September 30,
($ In Millions)	2014		2013			Change
Trust, Investment and Other Servicing Fees	$	718.2	$	648.0		$	70.2		11	%
Foreign Exchange Trading Income		46.4		62.8			(16.4	)	(26	)
Treasury Management Fees		16.4		17.6			(1.2	)	(7	)
Security Commissions and Trading Income		14.2		16.8			(2.6	)	(16	)
Other Operating Income		34.1		67.2			(33.1	)	(49	)
Investment Security Gains (Losses), net		0.3		(2.2	)		2.5		N/M
Total Noninterest Income	$	829.6	$	810.2		$	19.4		2	%

Trust, investment and other servicing fees are based generally on the market value of assets held in custody, managed and 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 and can be based on the beginning, ending or daily average value of the client portfolio.

The following tables present Northern Trust’s assets under custody and assets under management by business segment.

Assets Under Custody ($ In Billions)	September 30, 2014		June 30, 2014		September 30, 2013		Change Q3-14/ Q2-14			Change Q3-14/ Q3-13
Corporate & Institutional	$	5,403.1	$	5,488.0	$	4,766.5		(2	)%		13	%
Wealth Management		507.2		516.6		470.5		(2	)		8
Total Assets Under Custody	$	5,910.3	$	6,004.6	$	5,237.0		(2	)%		13	%

Assets Under Management ($ In Billions)	September 30, 2014		June 30, 2014		September 30, 2013		Change Q3-14/ Q2-14			Change Q3-14/ Q3-13
Corporate & Institutional	$	702.9	$	701.5	$	634.6		—	%		11	%
Wealth Management		220.4		222.9		211.6		(1	)		4
Total Assets Under Management	$	923.3	$	924.4	$	846.2		—	%		9	%

C&IS assets under custody totaled $5.4 trillion, up 13% from the prior year quarter, and includes $3.4 trillion of global custody assets, 14% higher compared to the prior year quarter. C&IS assets under management include $120.9 billion of securities lending collateral, a 16% increase from the prior year quarter.

Changes in assets under custody and under management are in comparison to the twelve month increase in the S&P 500^® index and MSCI EAFE^® index (USD) of 17.3% and 1.5%, respectively.

4

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Income (continued)

Custodied and managed assets were invested as follows at September 30, 2014, and 2013:

	2014									2013
Assets Under Custody	C&IS			WM			Consolidated			C&IS			WM			Consolidated
Equities		44	%		55	%		45	%		46	%		53	%		47	%
Fixed Income Securities		37			22			36			35			23			34
Cash and Other Assets		19			23			19			19			24			19
Assets Under Management
Equities		53	%		48	%		52	%		54	%		45	%		52	%
Fixed Income Securities		13			28			17			13			28			17
Cash and Other Assets		34			24			31			33			27			31

Trust, investment and other servicing fees in C&IS increased $40.1 million, or 11%, to $399.9 million from the prior year quarter’s $359.8 million.

C&IS Trust, Investment and Other Servicing Fees	Three Months Ended September 30,
($ In Millions)	2014		2013		Change
Custody and Fund Administration	$	275.0	$	239.4	$	35.6		15	%
Investment Management		75.4		71.3		4.1		6
Securities Lending		22.0		22.7		(0.7	)	(3	)
Other		27.5		26.4		1.1		4
Total	$	399.9	$	359.8	$	40.1		11	%

Custody and fund administration fees, the largest component of C&IS fees, increased 15%, driven by new business as well as the favorable impacts of equity markets and movements in foreign exchange rates. C&IS investment management fees increased 6%, as higher equity markets and new business were partially offset by higher waived fees in money market mutual funds. Money market mutual fund fee waivers in C&IS, attributable to persistent low short-term interest rates, totaled $16.7 million, compared to waived fees of $15.3 million in the prior year quarter. Securities lending revenue decreased 3%, primarily reflecting lower spreads offset by higher volumes in the current quarter. Other fees in C&IS increased 4%, primarily reflecting new business in investment risk and analytical services.

Trust, investment and other servicing fees in Wealth Management totaled $318.3 million, increasing $30.1 million, or 10%, from $288.2 million in the prior year quarter. The increased fee income is attributable to higher equity markets and new business. Money market mutual fund fee waivers in Wealth Management totaled $16.9 million compared with $17.1 million in the prior year quarter.

Foreign exchange trading income totaled $46.4 million, down $16.4 million, or 26%, compared with $62.8 million in the prior year quarter. The decrease is attributable to lower currency market volatility and client volumes as compared to the prior year quarter.

5

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Income (continued)

Other operating income totaled $34.1 million, down $33.1 million, or 49%, from $67.2 million in the prior year quarter. The components of other operating income are provided below.

Other Operating Income	Three Months Ended September 30,
($ In Millions)	2014		2013		Change
Loan Service Fees	$	15.3	$	15.8	$	(0.5	)	(3	)%
Banking Service Fees		12.3		12.8		(0.5	)	(4	)
Other Income		6.5		38.6		(32.1	)	(83	)
Total Other Operating Income	$	34.1	$	67.2	$	(33.1	)	(49	)%

The other income component of other operating income in the prior year quarter included the $32.6 million pre-tax gain on the sale of an office building property. Excluding the prior year quarter gain, other operating income was relatively unchanged.

Net Interest Income

Net interest income on an FTE basis totaled $256.2 million, up $11.4 million, or 5%, compared to $244.8 million in the prior year quarter. The increase is the result of higher levels of earning assets, partially offset by a decline in the net interest margin. Earning assets for the quarter averaged $97.0 billion, up $11.5 billion, or 13%, from $85.5 billion in the prior year quarter, primarily attributable to higher levels of Federal Reserve deposits and securities, reflecting higher levels of non-U.S. office interest-bearing deposits and demand deposits. The net interest margin declined to 1.05% from 1.14% in the prior year quarter, primarily reflecting lower yields on earning assets, partially offset by a lower cost of interest-related funds.

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 stated on an FTE basis is a non-generally accepted accounting principle (GAAP) financial measure that facilitates the analysis of asset 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 is provided on page 21.

Federal Reserve deposits averaged $15.9 billion as compared to $8.0 billion in the prior year quarter, an increase of $7.9 billion.

Average securities, inclusive of Federal Reserve and Federal Home Loan Bank stock and certain community development investments which are recorded in other assets in the consolidated balance sheet, were $33.6 billion, up $3.0 billion, or 10%, from $30.6 billion in the prior year quarter.

Loans and leases averaged $30.3 billion, up $1.6 billion, or 6%, from $28.7 billion in the prior year quarter, primarily reflecting higher levels of commercial and institutional loans and private client loans. Commercial and institutional loans averaged $8.0 billion, up $801.4 million, or 11%, from the prior year quarter’s average of $7.2 billion. Private client loans averaged $6.5 billion, up $655.3 million, or 11%, from the prior year quarter’s average of $5.9 billion.

Northern Trust utilizes a diverse mix of funding sources. Total interest-bearing deposits averaged $65.6 billion, compared to $59.3 billion in the prior year quarter, an increase of $6.3 billion, or 11%. Other interest-bearing funds averaged $8.3 billion, a decrease of $624.5 million, or 7%, from $8.9 billion in the prior year quarter, attributable to decreased senior notes and short-term borrowings, partially offset by increased long-term debt.

6

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income (continued)

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 $5.7 billion, or 33%, to $23.0 billion from $17.3 billion in the prior year quarter, primarily resulting from higher levels of demand and other noninterest-bearing deposits.

For additional quantitative analysis of average balances and interest rate changes affecting net interest income, refer to the Average Consolidated Balance Sheet with Analysis of Net Interest Income and the Analysis of Net Interest Income Changes Due To Volume and Rate on pages 22 through 25.

Provision for Credit Losses

There was no provision for credit losses recorded in the current quarter. A provision of $5.0 million was recorded in the prior year quarter. Net charge-offs were $5.2 million, resulting from charge-offs of $8.6 million and recoveries of $3.4 million. The prior year quarter included $8.3 million of net charge-offs, resulting from $11.6 million of charge-offs and $3.3 million of recoveries. Nonperforming assets decreased 19% from the prior year quarter. Residential real estate loans and commercial real estate loans accounted for 67% and 18%, respectively, of total nonperforming loans and leases at September 30, 2014. For additional discussion of the provision and allowance for credit losses, refer to the “Asset Quality” section beginning on page 16.

Noninterest Expense

The components of noninterest expense are provided below.

Noninterest Expense	Three Months Ended September 30,
($ In Millions)	2014		2013		Change
Compensation	$	348.0	$	324.6	$	23.4		7	%
Employee Benefits		70.6		63.5		7.1		11
Outside Services		142.4		145.9		(3.5	)	(2	)
Equipment and Software		100.5		95.5		5.0		5
Occupancy		43.8		43.3		0.5		1
Other Operating Expense		69.4		67.9		1.5		2
Total Noninterest Expense	$	774.7	$	740.7	$	34.0		5	%

Compensation expense, the largest component of noninterest expense, equaled $348.0 million, up $23.4 million, or 7%, from $324.6 million in the prior year quarter. The increase primarily reflects higher staff levels, base pay adjustments and the unfavorable impact of movements in foreign exchange rates. Staff on a full-time equivalent basis at September 30, 2014, totaled approximately 15,200, up 5% from a year ago.

Employee benefit expense totaled $70.6 million, up $7.1 million, or 11%, from $63.5 million in the prior year quarter. The increase is attributable to higher expense associated with employee medical benefits and payroll tax expense, partially offset by lower pension expense.

Expense associated with outside services totaled $142.4 million, down 2% from $145.9 million in the prior year quarter, reflecting decreased consulting and technical services expense, partially offset by increased sub-custodian expense.

Equipment and software expense totaled $100.5 million, up $5.0 million, or 5%, from $95.5 million in the prior year quarter. The current quarter reflects higher software amortization and related software support costs.

7

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Expense (continued)

Occupancy expense equaled $43.8 million, up 1% from $43.3 million in the prior year quarter.

Other operating expense totaled $69.4 million, up 2% from $67.9 million in the prior year quarter. The components of other operating expense are provided below.

Other Operating Expense	Three Months Ended September 30,
($ In Millions)	2014		2013		Change
Business Promotion	$	19.1	$	17.9	$	1.2		7	%
Staff Related		10.8		7.3		3.5		48
FDIC Insurance Premiums		5.8		6.6		(0.8	)	(12	)
Other Intangibles Amortization		4.8		5.2		(0.4	)	(8	)
Other Expenses		28.9		30.9		(2.0	)	(6	)
Total Other Operating Expense	$	69.4	$	67.9	$	1.5		2	%

Provision for Income Taxes

Income tax expense was $99.7 million, representing an effective tax rate of 32.8%, and $95.0 million in the prior year quarter, representing an effective tax rate of 31.5%.

BUSINESS UNIT REPORTING

The following tables reflect the earnings contributions and average assets of Northern Trust’s business units for the three and nine month periods ended September 30, 2014, and 2013. Business unit 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, and equity, and the applicable interest income and expense.

Three Months Ended September 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2014			2013			2014			2013			2014			2013			2014			2013
Noninterest Income Trust, Investment and Other Servicing Fees	$	399.9		$	359.8		$	318.3		$	288.2		$	—		$	—		$	718.2		$	648.0
Foreign Exchange Trading Income		44.4			61.8			2.0			1.0			—			—			46.4			62.8
Other Noninterest Income		42.8			44.3			20.9			54.3			1.3			0.8			65.0			99.4
Net Interest Income*		78.4			70.1			131.2			136.3			46.6			38.4			256.2			244.8
Revenue*		565.5			536.0			472.4			479.8			47.9			39.2			1,085.8			1,055.0
Provision for Credit Losses		0.9			0.4			(0.9	)		4.6			—			—			—			5.0
Noninterest Expense		429.6			412.0			312.1			297.3			33.0			31.4			774.7			740.7
Income before Income Taxes*		135.0			123.6			161.2			177.9			14.9			7.8			311.1			309.3
Provision (Benefit) for Income Taxes*		42.4			38.8			60.7			67.0			3.5			(3.0	)		106.6			102.8
Net Income	$	92.6		$	84.8		$	100.5		$	110.9		$	11.4		$	10.8		$	204.5		$	206.5
Percentage of Consolidated Net Income		45	%		41	%		49	%		54	%		6	%		5	%		100	%		100	%
Average Assets	$	59,907.1		$	53,653.5		$	26,061.8		$	22,923.6		$	19,275.8		$	18,635.4		$	105,244.7		$	95,212.5

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $6.9 million for 2014 and $7.8 million for 2013.

8

BUSINESS UNIT REPORTING (continued)

Nine Months Ended September 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2014			2013			2014			2013			2014			2013			2014			2013
Noninterest Income Trust, Investment and Other Servicing Fees	$	1,174.5		$	1,072.7		$	930.1		$	863.3		$	—		$	—		$	2,104.6		$	1,936.0
Foreign Exchange Trading Income		143.2			189.8			6.2			3.8			—			—			149.4			193.6
Other Noninterest Income		134.3			130.1			66.7			95.8			4.5			5.4			205.5			231.3
Net Interest Income*		228.8			200.2			398.8			425.3			136.4			81.0			764.0			706.5
Revenue*		1,680.8			1,592.8			1,401.8			1,388.2			140.9			86.4			3,223.5			3,067.4
Provision for Credit Losses		4.5			(1.1	)		(1.5	)		16.1			—			—			3.0			15.0
Noninterest Expense		1,299.5			1,206.7			960.3			900.9			93.9			91.7			2,353.7			2,199.3
Income (loss) before Income Taxes*		376.8			387.2			443.0			471.2			47.0			(5.3	)		866.8			853.1
Provision (Benefit) for Income Taxes*		113.3			123.0			166.9			177.8			18.8			(9.3	)		299.0			291.5
Net Income	$	263.5		$	264.2		$	276.1		$	293.4		$	28.2		$	4.0		$	567.8		$	561.6
Percentage of Consolidated Net Income		46	%		47	%		49	%		52	%		5	%		1	%		100	%		100	%
Average Assets	$	59,061.3		$	52,323.8		$	23,613.4		$	22,863.1		$	20,281.1		$	18,036.6		$	102,955.8		$	93,223.5

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $22.4 million for 2014 and $23.3 million for 2013.

Corporate & Institutional Services

C&IS net income totaled $92.6 million compared to $84.8 million in the prior year quarter, an increase of $7.8 million, or 9%. Noninterest income was $487.1 million, up $21.2 million, or 5%, from $465.9 million in the prior year quarter, reflecting higher trust, investment and other servicing fees, partially offset by lower foreign exchange trading income.

C&IS Trust, Investment and Other Servicing Fees	Three Months Ended September 30,
($ In Millions)	2014		2013		Change
Custody and Fund Administration	$	275.0	$	239.4	$	35.6		15	%
Investment Management		75.4		71.3		4.1		6
Securities Lending		22.0		22.7		(0.7	)	(3	)
Other		27.5		26.4		1.1		4
Total	$	399.9	$	359.8	$	40.1		11	%

Custody and fund administration fees, the largest component of C&IS fees, increased 15%, driven by new business as well as the favorable impacts of equity markets and movements in foreign exchange rates. C&IS investment management fees increased 6%, as higher equity markets and new business were partially offset by higher waived fees in money market mutual funds. Money market mutual fund fee waivers in C&IS, attributable to persistent low short-term interest rates, totaled $16.7 million, compared to waived fees of $15.3 million in the prior year quarter. Securities lending revenue decreased 3%, primarily reflecting lower spreads offset by higher volumes in the current quarter. Other fees in C&IS increased 4%, primarily reflecting new business in investment risk and analytical services.

Foreign exchange trading income totaled $44.4 million, a decrease of $17.4 million, or 28%, from $61.8 million in the prior year quarter. The decrease is attributable to lower currency market volatility and trading volumes as compared to the prior year quarter.

Other noninterest income in C&IS totaled $42.8 million, down 3% from $44.3 million in the prior year quarter, primarily reflecting lower treasury management fees.

Net interest income stated on an FTE basis was $78.4 million, up $8.3 million, or 12% from $70.1 million in the prior year quarter. The increase in net interest income is attributable to higher levels of average earning assets,

9

BUSINESS UNIT REPORTING (continued)

Corporate & Institutional Services (continued)

partially offset by a decrease in the net interest margin. Average earning assets totaled $53.3 billion, an increase of $7.5 billion, or 16%, from $45.8 billion in the prior year quarter, and were comprised of interest-bearing deposits with banks, loans and leases and investment securities. Funding sources were primarily comprised of non-U.S. custody-related interest-bearing deposits, which averaged $44.6 billion in the current quarter, up $7.6 billion, or 20%, from $37.0 billion in the prior year quarter. The net interest margin declined to 0.58% from 0.61% in the prior year quarter, reflecting lower yields on earning assets, partially offset by a lower cost of interest-related funds.

A provision for credit losses of $0.9 million was recorded for the current quarter, reflecting higher levels of commercial and institutional loans, partially offset by continued improvement in the credit quality of the commercial and institutional loan class. The prior year quarter included a provision of $0.4 million.

Total C&IS noninterest expense, which includes the direct expense of the business unit, indirect expense allocations for product and operating support, and indirect expense allocations for certain corporate support services, totaled $429.6 million, up $17.6 million, or 4%, from the prior year quarter’s $412.0 million. The increase is primarily attributable to higher indirect expense allocations and compensation expense in the current quarter.

Wealth Management

Wealth Management net income was $100.5 million, down $10.4 million, or 9%, from $110.9 million in the prior year quarter. Noninterest income was $341.2 million, down 1% from $343.5 million in the prior year quarter. Trust, investment and other servicing fees in Wealth Management totaled $318.3 million, up $30.1 million, or 10%, from $288.2 million in the prior year quarter. The increased fee income is attributable to higher equity markets and new business. Money market mutual fund fee waivers in Wealth Management totaled $16.9 million compared with $17.1 million in the prior year quarter. Other noninterest income totaled $20.9 million, down $33.4 million, or 62%, from $54.3 million in the prior year quarter. The prior year quarter included the $32.6 million pre-tax gain on the sale of an office building property. Excluding the prior year quarter gain, other noninterest income decreased 4%, from the prior year quarter, primarily reflecting lower security commissions and trading income in the current quarter.

Net interest income stated on an FTE basis was $131.2 million, down $5.1 million, or 4%, from $136.3 million in the prior year quarter, reflecting a decline in the net interest margin, partially offset by higher levels of average earning assets. The net interest margin decreased to 2.26% from 2.40% in the prior year quarter due to lower yields on earning assets, partially offset by lower deposit rates, each reflecting the low interest rate environment. Earning assets averaged $23.0 billion, up 2% from $22.6 billion in the prior year quarter. Earning assets and funding sources were primarily comprised of loans and domestic retail interest-bearing deposits, respectively.

A negative provision for credit losses of $0.9 million was recorded in the current quarter, primarily reflecting improvement in the credit quality of residential real estate loans and commercial real estate loans, and a decrease in the level of residential real estate loans. While the credit quality of residential real estate loans improved from the prior year quarter, nonperforming residential real estate loans remain elevated from historical levels. A provision for credit losses of $4.6 million was recorded in the prior year quarter.

Total noninterest expense, which includes the direct expense of the business unit, indirect expense allocations for product and operating support, and indirect expense allocations for certain corporate support services, totaled $312.1 million compared with $297.3 million in the prior year quarter, an increase of $14.8 million, or 5%. The increase is primarily attributable to higher indirect expense allocations and higher compensation expense in the current quarter.

10

BUSINESS UNIT REPORTING (continued)

Treasury and Other

Treasury and Other includes income and expense associated with the wholesale funding activities and the investment portfolios of the Corporation and its principal subsidiary, The Northern Trust Company, and certain corporate-based expenses, and nonrecurring items not allocated to the business units. Noninterest income totaled $1.3 million compared to noninterest income in the prior year quarter of $0.8 million. Net interest income increased $8.2 million, or 21%, to $46.6 million compared to $38.4 million in the prior year quarter, due to higher levels of earning assets, partially offset by lower internal yields on funds provided to business units. Average earning assets increased $3.5 billion, or 20%, to $20.6 billion in the current quarter, compared to $17.1 billion in the prior year quarter.

Noninterest expense totaled $33.0 million, up 5% from $31.4 million in the prior year quarter. The increase primarily reflects higher compensation, employee benefits and equipment and software expense, partially offset by higher indirect expense allocations to C&IS and Wealth Management as compared to the prior year quarter.

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS

Overview

Net income per diluted common share was $2.34 for the nine months ended September 30, 2014, and $2.29 in the comparable prior year period. Net income totaled $567.8 million, up $6.2 million, or 1%, as compared to $561.6 million in the prior year period. The performance in the current period produced an annualized return on average common equity of 9.5%, compared to 9.8% in the prior year period. The annualized return on average assets was 0.7%, compared to 0.8% in the prior year period.

The current year period includes pre-tax charges and write-offs totaling $42.3 million. Excluding these charges and write-offs, net income per diluted common share, net income and return on average common equity were $2.45, $595.6 million, and 10.0%, respectively. The prior year period included the $32.6 million pre-tax gain on the sale of an office building property. Excluding this gain, the prior year period net income per diluted common share, net income, and return on average common equity were $2.21, $541.3 million and 9.5%, respectively.

Revenue for the nine months ended September 30, 2014, totaled $3.20 billion, up $157.0 million, or 5%, from the prior year period’s $3.04 billion. Noninterest income was $2.50 billion, up $98.6 million, or 4%, from $2.36 billion in the prior year period. Trust, investment and other servicing fees increased $168.6 million, or 9%, to $2.10 billion from $1.94 billion in the prior year period.

Noninterest Income

The components of noninterest income are provided below.

Noninterest Income	Nine Months Ended September 30,
($ In Millions)	2014			2013			Change
Trust, Investment and Other Servicing Fees	$	2,104.6		$	1,936.0		$	168.6		9	%
Foreign Exchange Trading Income		149.4			193.6			(44.2	)	(23	)
Treasury Management Fees		49.8			51.5			(1.7	)	(3	)
Security Commissions and Trading Income		46.7			53.4			(6.7	)	(13	)
Other Operating Income		112.3			128.3			(16.0	)	(13	)
Investment Security Gains (Losses), net		(3.3	)		(1.9	)		(1.4	)	76
Total Noninterest Income	$	2,459.5		$	2,360.9		$	98.6		4	%

11

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Income (continued)

Trust, investment and other servicing fees from C&IS increased $101.8 million, or 9%, totaling $1.17 billion, compared to $1.07 billion a year ago.

C&IS Trust, Investment and Other Servicing Fees	Nine Months Ended September 30,
($ In Millions)	2014		2013		Change
Custody and Fund Administration	$	788.3	$	697.6	$	90.7		13	%
Investment Management		228.1		220.7		7.4		3
Securities Lending		74.7		76.1		(1.4	)	(2	)
Other		83.4		78.3		5.1		7
Total	$	1,174.5	$	1,072.7	$	101.8		9	%

Custody and fund administration fees, the largest component of C&IS fees, increased 13%, driven by new business and the favorable impacts of equity markets and movements in foreign exchange rates. C&IS investment management fees increased 3%, as higher equity markets and new business were partially offset by higher waived fees in money market mutual funds. Money market mutual fund fee waivers in C&IS, attributable to persistent low short-term interest rates, totaled $46.4 million, compared to waived fees of $33.9 million in the prior year period. Securities lending revenue decreased 2%, primarily reflecting lower spreads offset by higher loan volumes in the current year period. Other fees in C&IS increased 7%, primarily reflecting new business in investment risk and analytical services.

Trust, investment and other servicing fees in Wealth Management totaled $930.1 million, increasing $66.8 million, or 8%, from $863.3 million in the prior year period. The increase is primarily due to higher equity markets and new business, partially offset by higher waived fees in money market mutual funds. Money market mutual fund fee waivers in Wealth Management totaled $50.4 million compared with $43.4 million in the prior year period.

Foreign exchange trading income decreased $44.2 million, or 23%, and totaled $149.4 million compared with $193.6 million in the prior year period. The decrease is attributable to lower currency market volatility and client volumes compared to the prior year period.

Other operating income decreased $16.0 million, or 13%, to $112.3 million compared with $128.3 million in the prior year period. The components of other operating income are provided below.

Other Operating Income	Nine Months Ended September 30,
($ In Millions)	2014		2013		Change
Loan Service Fees	$	47.0	$	45.4	$	1.6		3	%
Banking Service Fees		37.2		38.1		(0.9	)	(2	)
Other Income		28.1		44.8		(16.7	)	(37	)
Total Other Operating Income	$	112.3	$	128.3	$	(16.0	)	(13	)%

The prior year period’s other income component of other operating income included a $32.6 million gain on the sale of an office building property and a $12.4 million write-off of certain fee receivables resulting from the correction of an accrual methodology followed in prior years. Excluding the prior year period gain on sale and fee receivables write-off, the other income component of other operating income increased $3.5 million, or 14%, in the current year period, primarily reflecting gains from currency-related hedging activity.

Net investment security losses totaled $3.3 million, compared to $1.9 million in the prior year period. The current year period includes $3.9 million of charges relating to the other-than-temporary impairment of certain Community Reinvestment Act (CRA) eligible securities.

12

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Net Interest Income

Net interest income stated on an FTE basis totaled $764.0 million, an increase of $57.5 million, or 8%, from $706.5 million reported in the prior year period. The increase is the result of higher levels of earning assets, partially offset by a decline in the net interest margin. Earning assets averaged $94.8 billion, up $11.2 million, or 13%, from $83.6 billion in the prior year period, primarily attributable to higher levels of Federal Reserve deposits and investment securities. The increased Federal Reserve deposits and securities primarily reflect higher levels of non-U.S. interest-bearing client deposits and demand deposits as compared to the prior year. The net interest margin declined to 1.08% from 1.13% in the prior year period reflecting lower yields on earning assets, partially offset by a lower cost of interest-related funds.

Provision for Credit Losses

A provision for credit losses of $3.0 million was recorded in the current year period. A provision of $15.0 million was recorded in the prior year period. Net charge-offs totaled $12.6 million resulting from $27.9 million of charge-offs and $15.3 million of recoveries, compared to net charge-offs of $25.1 million in the prior year period resulting from $39.8 million of charge-offs and $14.7 million of recoveries. The current period provision reflects improvement in the credit quality of the residential real estate, commercial and institutional, and commercial real estate loan classes. Residential real estate loans, however, continued to reflect weakness relative to the overall portfolio, accounting for 67% and 70% of total nonperforming loans and leases at September 30, 2014, and 2013, respectively. For a fuller discussion of the consolidated allowance and provision for credit losses refer to the “Asset Quality” section beginning on page 16.

Noninterest Expense

Noninterest expense totaled $2.35 billion for the current period, up $154.4 million, or 7%, from the prior year period’s $2.20 billion. The components of noninterest expense are provided below.

Noninterest Expense	Nine Months Ended September 30,
($ In Millions)	2014		2013		Change
Compensation	$	1,062.2	$	971.8	$	90.4		9	%
Employee Benefits		206.0		191.0		15.0		8
Outside Services		431.4		412.0		19.4		5
Equipment and Software		317.9		279.0		38.9		14
Occupancy		135.2		130.0		5.2		4
Other Operating Expense		201.0		215.5		(14.5	)	(7	)
Total Noninterest Expense	$	2,353.7	$	2,199.3	$	154.4		7	%

Compensation expense, the largest component of noninterest expense, increased $90.4 million, or 9%, to $1.06 billion from the prior year period’s $971.8 million. The current year period includes pre-tax severance-related charges of $25.5 million. Excluding the severance-related charges, compensation expense increased $64.9 million, or 7%, primarily reflecting higher staff levels, base pay adjustments and the unfavorable impact of movements in foreign exchange rates.

Employee benefit expense increased $15.0 million, or 8% to $206.0 million from $191.0 million in the prior year period, and includes $1.9 million of severance-related charges. Excluding these charges, employee benefit expense increased $13.1 million, or 7%, primarily attributable to higher expense associated with employee medical benefits and payroll tax expense, partially offset by lower pension expense.

Outside services expense equaled $431.4 million, up $19.4 million, or 5%, from $412.0 million in the prior year period. Outside services expense includes $1.1 million of severance-related charges in the current period.

13

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS (continued)

Noninterest Expense (continued)

Excluding these charges, outside services expense increased $18.3 million, or 4%, primarily reflecting volume-driven growth in global sub-custodian expense as well as higher consulting and legal services expense.

Equipment and software expense totaled $317.9 million, up $38.9 million, or 14% from $279.0 million in the prior year period. The current period includes $9.5 million of pre-tax write-offs of replaced or eliminated software. Excluding these write-offs, equipment and software expense increased $29.4 million, or 11%, reflecting higher software amortization and related software support costs.

Occupancy expense equaled $135.2 million, up $5.2 million, or 4%, from $130.0 million in the prior year period. The current period includes pre-tax charges totaling $4.3 million in connection with reductions in office space. Excluding these charges, occupancy expense increased 1% from the prior year period.

The components of other operating expense are provided below.

Other Operating Expense	Nine Months Ended September 30,
($ In Millions)	2014		2013		Change
Business Promotion	$	66.6	$	67.2	$	(0.6	)	(1	)%
FDIC Insurance Premiums		16.4		18.4		(2.0	)	(11	)
Staff Related		30.3		25.8		4.5		18
Other Intangibles Amortization		14.7		15.5		(0.8	)	(5	)
Other Expenses		73.0		88.6		(15.6	)	(18	)
Total Other Operating Expense	$	201.0	$	215.5	$	(14.5	)	(7	)%

The decrease in the other expenses component of other operating expense primarily reflects lower charges associated with account servicing activities in the current year period.

Provision for Income Taxes

Income tax expense was $276.6 million for the nine months ended September 30, 2014, representing an effective tax rate of 32.8%. This compares with $268.2 million of income tax expense and an effective tax rate of 32.3% in the prior year period.

BALANCE SHEET

Total assets at September 30, 2014, were $111.2 billion and averaged $105.2 billion for the current quarter, compared with total assets of $96.0 billion at September 30, 2013, and average total assets of $95.2 billion in the prior year quarter. 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 $30.7 billion at September 30, 2014, and averaged $30.3 billion in the current quarter, each up 6% compared to $29.1 billion at September 30, 2013, and a $28.7 billion average in the prior year quarter. 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 sheet, totaled $32.7 billion at September 30, 2014, and averaged $33.6 billion for the current quarter, up 6% and 10%, respectively, as compared to $31.0 billion at September 30, 2013, and $30.6 billion on average in the prior year quarter. In aggregate, the balance sheet line item categories of federal funds sold and securities purchased under agreements to resell, interest-bearing deposits with banks, and Federal Reserve deposits totaled $37.7 billion at September 30, 2014, and averaged $33.1 billion in the current quarter, up 43% and 26%, respectively, from the prior year quarter balances, primarily reflecting increased Federal Reserve deposits. Interest-bearing deposits at

14

BALANCE SHEET (continued)

September 30, 2014, totaled $67.0 billion and averaged $65.6 billion, up 10% and 11%, respectively, compared to $60.8 billion at September 30, 2013, and a $59.3 billion average in the prior year quarter. Noninterest-bearing deposits at September 30, 2014, totaled $24.7 billion and averaged $20.1 billion, up 42% and 24%, respectively, compared to $17.4 billion at September 30, 2013, and a $16.1 billion average in the prior year quarter.

Total stockholders’ equity at September 30, 2014, was $8.5 billion and averaged $8.3 billion for the current quarter, up 9% and 8%, respectively, as compared to $7.8 billion at September 30, 2013, and $7.7 billion on average for the prior year quarter. The increase is primarily attributable to earnings retained and the issuance of preferred stock, partially offset by dividend declarations and the repurchase of common stock pursuant to the Corporation’s share buyback program. On August 5, 2014, Northern Trust issued 16,000 shares of Series C Non-Cumulative Perpetual Preferred Stock (“Series C Preferred Stock”), without par value, for proceeds of approximately $390 million. Shares of the Series C Preferred Stock rank senior to Northern Trust’s common stock. During the three and nine months ended September 30, 2014, Northern Trust repurchased 1,141,349 shares of common stock at a cost of $77.3 million ($67.76 average price per share) and 5,001,481 shares of common stock at a cost of $315.2 million ($63.03 average price per share), respectively.

The capital ratios of Northern Trust and its principal subsidiary bank, The Northern Trust Company, remained strong at September 30, 2014, with all ratios applicable to classification as “well capitalized” under U.S. regulatory requirements having been exceeded.

Capital Ratios — Northern Trust Corporation	September 30, 2014						June 30, 2014						December 31, 2013 (c)
	Advanced (a) Approach			Standardized (b) Approach			Advanced (a) Approach			Standardized (b) Approach
Common Equity Tier 1		12.7	%		12.8	%		12.7	%		12.7	%		12.9	%
Tier 1		13.4			13.6			12.9			12.9			13.4
Total		15.3			16.0			14.9			15.4			15.8
Leverage		n/a			7.9			n/a			7.6			7.9

Capital Ratios — The Northern Trust Company	September 30, 2014						June 30, 2014						December 31, 2013 (c)
	Advanced (a) Approach			Standardized (b) Approach			Advanced (a) Approach			Standardized (b) Approach
Common Equity Tier 1		11.7	%		11.6	%		11.7	%		11.4	%		11.5	%
Tier 1		11.7			11.6			11.6			11.4			11.5
Total		13.7			14.0			13.7			14.0			14.3
Leverage		n/a			6.8			n/a			6.7			6.8

(a) Effective with the second quarter of 2014, Northern Trust exited its parallel run. Accordingly, the September 30, 2014, and June 30, 2014, ratios are calculated in compliance with the Basel III Advanced Approach final rules released by the Board of Governors of the Federal Reserve on July 2, 2013.

(b) Standardized Approach capital components in 2014 are determined by Basel III phased in requirements and risk weighted assets are determined by Basel I requirements. The September 30, 2014, and June 30, 2014, ratios calculated under the Standardized Approach comply with the final rules released by the Board of Governors of the Federal Reserve on July 2, 2013.

(c) The December 31, 2013 ratios are calculated in accordance with Basel I requirements.

STATEMENT OF CASH FLOWS

Net cash provided by operating activities was $1.3 billion and $960.9 million for the nine months ended September 30, 2014, and 2013, respectively. Net cash provided by operating activities in both periods was primarily attributable to period earnings, inclusive of the impact of non-cash charges such as the amortization of computer software, and a reduction of net collateral deposited with derivative counterparties.

15

STATEMENT OF CASH FLOWS (continued)

Net cash used in investing activities of $9.1 billion for the nine months ended September 30, 2014, is primarily attributable to increased levels of Federal Reserve deposits, net purchases of securities held to maturity, and increased levels of loans and leases, partially offset by decreased levels of interest-bearing deposits with banks. The increase in Federal Reserve deposits and the decrease in interest-bearing deposits with banks primarily reflect the redeployment of investments in bank time deposits to Federal Reserve deposits and securities held to maturity. The increase in Federal Reserve deposits also reflects increases in demand and other noninterest-bearing deposits and in interest-bearing and noninterest-bearing non-U.S. office client deposits.

Net cash provided by investing activities of $510.0 million for the nine months ended September 30, 2013, primarily reflects a decrease in interest-bearing deposits with banks and net changes within securities held to maturity and available for sale, partially offset by increased Federal Reserve deposits. The decrease in interest-bearing deposits with banks and the increase in Federal Reserve deposits primarily reflect the redeployment of investments in bank time deposits to Federal Reserve deposits. The increase in Federal Reserve deposits also reflects an increase in short-term other borrowings, offset by a decline in U.S. office client deposits.

For the nine months ended September 30, 2014, net cash provided by financing activities totaled $7.5 billion, primarily reflecting increased total deposits and proceeds from the issuance of Series C Preferred Stock, partially offset by repayments of senior notes and other long term debt and the repurchase of common stock pursuant to the Corporation’s share buyback program. The increase in total deposits is attributable to increases in demand and other noninterest-bearing client deposits and in interest-bearing and noninterest-bearing non-U.S. office client deposits. The decreases in senior notes and other long term debt reflect the maturity of $500 million of fixed-rate senior notes and repayments of borrowings from the Federal Home Loan Bank, respectively.

For the nine months ended September 30, 2013, net cash used in financing activities totaled $2.4 billion, primarily reflecting a decline in the level of total deposits, partially offset by an increase in short-term other borrowings. The decline in the level of total deposits was primarily due to a decline in U.S. demand deposits from the level at December 31, 2012, largely driven by the expiration on that date of the Federal Deposit Insurance Corporation’s Temporary Liquidity Guarantee Program which had provided unlimited deposit insurance. The increase in short-term other borrowings in the prior year period reflects additional short-term borrowings from the Federal Home Loan Bank.

ASSET QUALITY

Securities Portfolio

Northern Trust maintains a high quality securities portfolio, with 84% of the combined available for sale, held to maturity, and trading account portfolios at September 30, 2014, comprised of U.S. Treasury and government sponsored agency securities and triple-A rated corporate notes, asset-backed securities, supranational, sovereign and non-U.S. agency bonds, auction rate securities 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, 6% was rated double-A, 3% was rated below double-A, and 7% 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 $59.9 million at September 30, 2014, comprised of $142.4 million and $82.5 million of gross unrealized gains and losses, respectively. Of the unrealized losses on securities at September 30, 2014, the largest component, totaling $33.4 million, related to corporate debt securities, primarily reflecting higher market rates since purchase; 40% of the corporate debt portfolio is backed by guarantees provided by U.S. and non-U.S. governmental entities. Unrealized losses of $25.2 million related to government sponsored agency securities are primarily attributable to changes in market rates since their purchase.

16

ASSET QUALITY (continued)

Securities Portfolio (continued)

For the nine months ended September 30, 2014, charges of $3.9 million were recorded relating to the other-than-temporary impairment (OTTI) of certain CRA eligible securities. There were no OTTI losses for the three months ended September 30, 2014, or for the three or nine months ended September 30, 2013. 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.

Exposures in Europe

Northern Trust continues to monitor closely economic developments in Europe. Northern Trust considers Ireland, Portugal, Italy, Greece, Spain, Cyprus and Slovenia to be those European countries experiencing significant economic, fiscal and/or political strains. At September 30, 2014, Northern Trust’s gross cross-border exposure to obligors in Ireland totaled approximately $660 million, or less than 1% of Northern Trust’s total consolidated assets. Of the cross-border exposure to obligors in Ireland, $6 million was to banks and the remainder was to commercial and other borrowers, primarily funds domiciled in Ireland whose assets and investment activities are broadly diversified by investment strategy, issuer type, country of risk, and/or instrument type. Exposures to the borrowers in Ireland may be secured or unsecured, committed or uncommitted, but are typically for short

periods of a year or less for foreign exchange, overdraft accommodations, and loans. As of September 30, 2014, there was no cross-border exposure to obligors in Italy, Portugal, Greece, Spain, Cyprus or Slovenia, and there was no exposure to sovereign debt securities in any of the European countries deemed to be experiencing significant economic, fiscal and/or political strains. Exposure levels at September 30, 2014, reflect Northern Trust’s risk management policies and practices, which operate to limit exposures to higher risk financial and sovereign entities.

17

ASSET QUALITY (continued)

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 segment and class, and of OREO that were outstanding at the dates shown, as well as the balance of loans that were 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.

($ In Millions)	September 30, 2014			June 30, 2014			December 31, 2013			September 30, 2013
Nonperforming Loans and Leases
Commercial
Commercial and Institutional	$	31.7		$	20.8		$	23.1		$	24.1
Commercial Real Estate		39.9			45.4			49.2			54.3
Total Commercial		71.6			66.2			72.3			78.4
Personal
Residential Real Estate		147.3			161.7			189.1			189.8
Private Client		1.6			1.4			1.4			1.9
Total Personal		148.9			163.1			190.5			191.7
Total Nonperforming Loans and Leases		220.5			229.3			262.8			270.1
Other Real Estate Owned		10.7			12.6			11.9			13.9
Total Nonperforming Assets		231.2			241.9			274.7			284.0
90 Day Past Due Loans Still Accruing	$	25.1		$	13.1		$	16.4		$	24.8
Nonperforming Loans and Leases to Total Loans and Leases		0.72	%		0.75	%		0.89	%		0.93	%
Coverage of Loan and Lease Allowance to Nonperforming Loans and Leases		1.2x			1.2x			1.1x			1.1x

Nonperforming assets of $231.2 million as of September 30, 2014, reflect improved credit quality from the prior year, though they remain elevated from levels preceding the economic downturn in 2008 and its impact on residential property valuations and general economic conditions. The current period loan portfolio reflects improvement in the credit quality of the residential real estate, commercial and institutional, and commercial real estate 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 credit quality, including nonperforming loan balances, impact the level of 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 focuses its lending efforts on clients who are looking to utilize a full range of financial services with Northern Trust. 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 ARM loans, subprime loans, loans with initial “teaser” rates, and loans with excessively high loan-to-value ratios. Residential real estate loans consist of traditional 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.

18

ASSET QUALITY (continued)

Nonperforming Loans and Other Real Estate Owned (continued)

The commercial real estate class consists primarily of commercial mortgages and a limited number of construction, acquisition and development loans extended primarily to 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 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.

There was no provision for credit losses recorded in the current quarter. A provision of $5.0 million was recorded in the prior year quarter. Net charge-offs were $5.2 million, resulting from $8.6 million of charge-offs and $3.4 million of recoveries, compared to $8.3 million of net charge-offs in the prior year quarter, resulting from $11.6 million of charge-offs and $3.3 million of recoveries. The current quarter reflects improvement in the credit quality of the residential real estate, commercial and institutional, and commercial real estate loan classes. Residential real estate loans continued to reflect weakness relative to the overall portfolio, accounting for 67% and 70% of total nonperforming loans and leases at September 30, 2014, and 2013, respectively.

Note 6 to the consolidated financial statements includes a table that details the changes in the allowance for credit losses during the three and nine months ended September 30, 2014, and 2013 due to charge-offs, recoveries, and provisions for credit losses.

19

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.

	September 30, 2014						June 30, 2014						December 31, 2013						September 30, 2013
($ 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			Allowance Amount			Percent of Loans to Total Loans
Specific Allowance	$	24.0			—	%	$	23.8			—	%	$	24.9			—	%	$	32.3			—	%
Allocated Inherent Allowance
Commercial
Commercial and Institutional		71.9			27			71.4			26			67.5			25			72.4			25
Commercial Real Estate		68.3			10			69.3			10			71.5			10			72.2			10
Lease Financing, net		3.7			3			3.4			3			4.2			3			4.4			3
Non-U.S.		2.1			5			2.7			4			2.1			3			2.4			4
Other		—			—			—			2			—			2			—			1
Total Commercial		146.0			45			146.8			45			145.3			43			151.4			43
Personal
Residential Real Estate		110.4			32			114.6			33			118.7			35			117.0			36
Private Client		17.9			23			18.3			22			19.0			22			16.8			21
Other		—			—			—			—			—			—			—			—
Total Personal		128.3			55			132.9			55			137.7			57			133.8			57
Total Allocated Inherent Allowance	$	274.3			100	%	$	279.7			100	%	$	283.0			100	%	$	285.2			100	%
Total Allowance for Credit Losses		298.3						303.5						307.9						317.5
Allowance Assigned to
Loans and Leases	$	269.4					$	275.2					$	278.1					$	287.2
Undrawn Commitments and Standby Letters of Credit		28.9						28.3						29.8						30.3
Total Allowance for Credit Losses	$	298.3					$	303.5					$	307.9					$	317.5
Allowance Assigned to Loans and Leases to Total Loans and Leases		0.88	%					0.90	%					0.95	%					0.99	%

MARKET RISK MANAGEMENT

As described in the 2013 Annual Report to Shareholders, Northern Trust manages its interest rate risk through two primary measurement techniques: simulation of earnings and simulation of economic value of equity. Also, as part of its risk management activities, it regularly measures the risk of loss associated with foreign currency positions using a Value-at-Risk (VaR) model.

Based on this continuing evaluation process, Northern Trust’s interest rate risk position, as measured by current market implied forward rates and sensitivity analyses, and the risk of loss as measured by the VaR associated with the foreign exchange trading portfolio, have not changed significantly since December 31, 2013.

20

RECONCILIATION OF REPORTED NET INTEREST INCOME TO FULLY TAXABLE EQUIVALENT

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

	Three Months Ended
	September 30, 2014								September 30, 2013
($ In Millions)	Reported			FTE Adj.		FTE			Reported			FTE Adj.		FTE
Interest Income	$	293.8		$	6.9	$	300.7		$	291.1		$	7.8	$	298.9
Interest Expense		44.5			—		44.5			54.1			—		54.1
Net Interest Income	$	249.3		$	6.9	$	256.2		$	237.0		$	7.8	$	244.8
Net Interest Margin		1.02	%				1.05	%		1.10	%				1.14	%

	Nine Months Ended
	September 30, 2014								September 30, 2013
($ In Millions)	Reported			FTE Adj.		FTE			Reported			FTE Adj.		FTE
Interest Income	$	883.0		$	22.4	$	905.4		$	853.1		$	23.3	$	876.4
Interest Expense		141.4			—		141.4			169.9			—		169.9
Net Interest Income	$	741.6		$	22.4	$	764.0		$	683.2		$	23.3	$	706.5
Net Interest Margin		1.05	%				1.08	%		1.09	%				1.13	%

21

The following schedule should be read in conjunction with the Net Interest Income section of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

AVERAGE CONSOLIDATED BALANCE SHEET WITH ANALYSIS OF NET INTEREST INCOME									NORTHERN TRUST CORPORATION
(INTEREST AND RATE ON A FULLY TAXABLE EQUIVALENT BASIS)	Third Quarter
	2014								2013
($ In Millions)	Interest		Average Balance			Rate (3)			Interest		Average Balance			Rate (3)
Average Earning Assets
Federal Funds Sold and Securities Purchased under Agreements to Resell	$	1.0	$	923.1			0.44	%	$	0.7		548.2			0.52	%
Interest-Bearing Deposits with Banks		30.9		16,288.3			0.75			36.3		17,767.6			0.81
Federal Reserve Deposits		10.4		15,914.3			0.26			5.1		7,987.5			0.26
Securities
U.S. Government		7.9		3,031.9			1.03			4.5		1,619.2			1.11
Obligations of States and Political Subdivisions		2.5		148.5			6.74			4.2		268.8			6.31
Government Sponsored Agency		34.2		17,385.6			0.78			36.0		17,082.6			0.84
Other (1)		27.5		13,019.4			0.84			25.0		11,592.8			0.85
Total Securities		72.1		33,585.4			0.85			69.8		30,563.4			0.91
Loans and Leases (2)		186.3		30,256.4			2.44			187.0		28,662.4			2.59
Total Earning Assets		300.7		96,967.5			1.23			298.9		85,529.1			1.39
Allowance for Credit Losses Assigned to Loans and Leases		—		(273.4	)		—			—		(289.6	)		—
Cash and Due from Banks		—		2,783.0			—			—		2,776.8			—
Buildings and Equipment		—		445.6			—			—		453.0			—
Client Security Settlement Receivables		—		820.8			—			—		714.8			—
Goodwill		—		541.9			—			—		532.5			—
Other Assets		—		3,959.3			—			—		5,495.9			—
Total Assets	$	—	$	105,244.7			—	%	$	—	$	95,212.5			—	%
Average Source of Funds
Deposits
Savings and Money Market	$	2.5	$	15,019.0			0.07	%	$	2.3	$	14,286.5			0.06	%
Savings Certificates and Other Time		1.4		1,902.9			0.30			2.8		1,969.0			0.56
Non-U.S. Offices — Interest-Bearing		17.7		48,725.5			0.14			20.7		43,064.7			0.19
Total Interest-Bearing Deposits		21.6		65,647.4			0.13			25.8		59,320.2			0.17
Short-Term Borrowings		1.5		4,860.3			0.12			1.3		5,447.2			0.09
Senior Notes		11.6		1,496.8			3.10			18.4		2,192.5			3.33
Long-Term Debt		9.2		1,636.5			2.23			8.0		978.5			3.23
Floating Rate Capital Debt		0.6		277.2			0.81			0.6		277.1			0.85
Total Interest-Related Funds		44.5		73,918.2			0.24			54.1		68,215.5			0.31
Interest Rate Spread		—		—			0.99			—		—			1.08
Demand and Other Noninterest-Bearing Deposits		—		20,069.8			—			—		16,134.2			—
Other Liabilities		—		2,971.2			—			—		3,165.0			—
Stockholders’ Equity		—		8,285.5			—			—		7,697.8			—
Total Liabilities and Stockholders’ Equity	$	—	$	105,244.7			—	%	$	—	$	95,212.5			—	%
Net Interest Income/Margin (FTE Adjusted)	$	256.2	$	—			1.05	%	$	244.8	$	—			1.14	%
Net Interest Income/Margin (Unadjusted)	$	249.3	$	—			1.02	%	$	237.0	$	—			1.10	%

22

ANALYSIS OF NET INTEREST INCOME CHANGES DUE TO VOLUME AND RATE
	Three Months 2014/2013
	Change Due To
(In Millions)	Average Balance		Rate			Total
Earning Assets (FTE)	$	40.1	$	(38.3	)	$	1.8
Interest-Related Funds		4.5		(14.1	)		(9.6	)
Net Interest Income (FTE)	$	35.6	$	(24.2	)	$	11.4

(1) Other securities include Federal Reserve and Federal Home Loan Bank stock and certain community development investments which are classified in other assets in the consolidated balance sheet as of September 30, 2014 and 2013.

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

(3) 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 37.8% and 37.5% for the three months ending September 30 2014 and 2013, respectively. Total taxable equivalent interest adjustments amounted to $6.9 million and $7.8 million for the three months ended September 30 2014 and 2013, 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.

23

The following schedule should be read in conjunction with the Net Interest Income section of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

AVERAGE CONSOLIDATED BALANCE SHEET WITH ANALYSIS OF NET INTEREST INCOME									NORTHERN TRUST CORPORATION
(INTEREST AND RATE ON A FULLY TAXABLE EQUIVALENT BASIS)	Nine Months
	2014								2013
($ In Millions)	Interest		Average Balance			Rate (3)			Interest		Average Balance			Rate (3)
Average Earning Assets
Federal Funds Sold and Securities Purchased under
Agreements to Resell	$	2.3	$	670.6			0.47	%	$	1.2	$	370.2			0.44	%
Interest-Bearing Deposits with Banks		96.6		16,879.0			0.77			105.8		18,018.7			0.79
Federal Reserve Deposits		26.9		13,967.6			0.26			11.0		5,726.8			0.26
Securities
U.S. Government		21.0		2,574.0			1.09			13.8		1,729.2			1.07
Obligations of States and Political Subdivisions		8.8		176.4			6.68			13.9		292.1			6.34
Government Sponsored Agency		108.3		17,858.3			0.81			96.7		17,540.1			0.74
Other (1)		83.5		12,815.0			0.87			70.7		11,296.2			0.84
Total Securities		221.6		33,423.7			0.89			195.2		30,857.6			0.85
Loans and Leases (2)		558.0		29,832.9			2.50			563.2		28,642.0			2.63
Total Earning Assets		905.4		94,773.8			1.28			876.4		83,615.3			1.40
Allowance for Credit Losses Assigned to Loans and Leases		—		(276.0	)		—			—		(292.0	)		—
Cash and Due from Banks		—		2,814.6			—			—		3,042.4			—
Buildings and Equipment		—		451.3			—			—		460.7			—
Client Security Settlement Receivables		—		835.1			—			—		776.5			—
Goodwill		—		541.9			—			—		532.2			—
Other Assets		—		3,815.1			—			—		5,088.4			—
Total Assets	$	—	$	102,955.8			—	%	$	—	$	93,223.5			—	%
Average Source of Funds
Deposits
Savings and Money Market	$	7.3	$	14,854.9			0.07	%	$	7.4	$	14,598.3			0.07	%
Savings Certificates and Other Time		4.8		1,908.5			0.34			10.1		2,183.0			0.62
Non-U.S. Offices — Interest-Bearing		52.0		48,101.2			0.14			62.4		40,457.1			0.21
Total Interest-Bearing Deposits		64.1		64,864.6			0.13			79.9		57,238.4			0.19
Short-Term Borrowings		3.8		4,544.5			0.11			3.8		4,541.7			0.11
Senior Notes		42.8		1,716.5			3.34			56.9		2,331.4			3.26
Long-Term Debt		29.0		1,668.9			2.32			27.5		1,119.4			3.29
Floating Rate Capital Debt		1.7		277.2			0.81			1.8		277.1			0.86
Total Interest-Related Funds		141.4		73,071.7			0.26			169.9		65,508.0			0.35
Interest Rate Spread		—		—			1.02			—		—			1.05
Demand and Other Noninterest-Bearing Deposits		—		18,857.0			—			—		16,830.8			—
Other Liabilities		—		2,972.8			—			—		3,254.4			—
Stockholders’ Equity		—		8,054.3			—			—		7,630.3			—
Total Liabilities and Stockholders’ Equity	$	—	$	102,955.8			—	%	$	—	$	93,223.5			—	%
Net Interest Income/Margin (FTE Adjusted)	$	764.0	$	—			1.08	%	$	706.5	$	—			1.13	%
Net Interest Income/Margin (Unadjusted)	$	741.6	$	—			1.05	%	$	683.2	$	—			1.09	%

24

ANALYSIS OF NET INTEREST INCOME CHANGES DUE TO VOLUME AND RATE
	Nine Months 2014/2013
	Change Due To
(In Millions)	Average Balance		Rate			Total
Earning Assets (FTE)	$	116.8	$	(87.8	)	$	29.0
Interest-Related Funds		19.8		(48.3	)		(28.5	)
Net Interest Income (FTE)	$	97.0	$	(39.5	)	$	57.5

(1) Other securities include Federal Reserve and Federal Home Loan Bank stock and certain community development investments which are classified in other assets in the consolidated balance sheet as of September 30, 2014 and 2013.

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

(3) 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 37.8 % and 37.5% for the nine months ending September 30 2014 and 2013, respectively. Total taxable equivalent interest adjustments amounted to $22.5 million and $23.3 million for the nine months ended September 30, 2014 and 2013, 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.

25

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”, “may increase”, “plan”, “goal”, “target”, “strategy”, and similar expressions or future or conditional verbs such as “may”, “will”, “should”, “would”, and “could.” You should carefully read the risk factors described in “Risk factors” in our Annual Report on Form 10-K for the year ended December 31, 2013, for a description of certain risks that could, among other things, cause our actual results to differ from these forward looking statements.

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 of the U.S. and international economies, including those in Europe;

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

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

• 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, client portfolios, or securities lending collateral pools, including those funds, portfolios, collateral pools, 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, including special deposit assessments or potentially higher FDIC premiums;

• a significant downgrade of any of our 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;

• difficulties in measuring, or determining whether there is other-than-temporary impairment in, the value of securities held in Northern Trust’s investment portfolios;

• our success in managing various risks inherent in our businesses, including credit risk, operational risk, interest rate risk, liquidity risk and strategic risk, particularly during times of economic uncertainty and volatility in the credit and financial markets;

26

FORWARD-LOOKING STATEMENTS (continued)

• geopolitical risks and the risks of extraordinary events such as natural disasters, terrorist events, war and the U.S. and other governments’ responses 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;

• changes in tax laws, accounting requirements or interpretations and other legislation in the U.S. or other countries that could affect Northern Trust or our clients;

• changes in the nature and activities of Northern Trust’s competition, including increased consolidation within the financial services industry;

• our success in maintaining existing business and continuing to generate new business in existing markets;

• the impact of equity markets on fee revenue;

• our success in identifying and penetrating targeted markets;

• our ability to address the complex needs of a global client base and manage compliance with legal, tax, regulatory and other requirements, especially in immature markets;

• our ability to maintain a product mix that achieves acceptable margins;

• our ability to continue to generate investment results that satisfy clients and to develop an array of investment products;

• our success in generating revenue in our securities lending business, including for our clients, especially in periods of economic and financial market uncertainty;

• our 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;

• our success in controlling expenses and implementing revenue enhancement initiatives;

• our ability, as products, methods of delivery, and client requirements change or become more complex, to continue to fund and accomplish innovation;

• our ability to improve risk management practices and controls, and 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;

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

• 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 U.S. and other countries such as anti-money laundering, anti-bribery, and client privacy;

• risks that evolving regulations, such as Basel III and those promulgated under the Dodd-Frank Act, could affect required regulatory capital for financial institutions, including Northern Trust, potentially resulting in changes to the cost and composition of capital for Northern Trust;

• the potential for substantial changes in the legal, regulatory and enforcement framework and oversight applicable to financial institutions in reaction to adverse financial market events, including changes that may affect leverage limits and risk-based capital and liquidity requirements for certain financial

27

FORWARD-LOOKING STATEMENTS (continued)

institutions, 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 our dependence on dividends from our principal subsidiary;

• the risk of damage to our reputation which may undermine the confidence of clients, counterparties, rating agencies, and stockholders; and

• other factors identified in our Annual Report on Form 10-K, including those factors described in “Item 1A — Risk Factors”, and other filings with the SEC, all of which are available on our website.

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.

28

ITEM 1. FINANCIAL STATEMENTS

CONSOLIDATED BALANCE SHEET NORTHERN TRUST CORPORATION

(In Millions Except Share Information)	September 30, 2014			December 31, 2013
	(Unaudited)
Assets
Cash and Due from Banks	$	2,918.9		$	3,162.4
Federal Funds Sold and Securities Purchased under Agreements to Resell		1,010.0			529.6
Interest-Bearing Deposits with Banks		15,334.5			19,397.4
Federal Reserve Deposits		21,328.0			12,911.5
Securities
Available for Sale		28,107.7			28,392.8
Held to Maturity (Fair value of $4,195.1 and $2,321.4)		4,196.7			2,325.8
Trading Account		4.3			1.7
Total Securities		32,308.7			30,720.3
Loans and Leases
Commercial		13,868.6			12,620.0
Personal		16,851.3			16,765.5
Total Loans and Leases (Net of unearned income of $299.2 and $286.2)		30,719.9			29,385.5
Allowance for Credit Losses Assigned to Loans and Leases		(269.4	)		(278.1	)
Buildings and Equipment		436.6			458.8
Client Security Settlement Receivables		1,538.6			1,355.2
Goodwill		538.1			540.7
Other Assets		5,289.8			4,764.0
Total Assets	$	111,153.7		$	102,947.3
Liabilities
Deposits
Demand and Other Noninterest-Bearing	$	21,609.6		$	16,888.7
Savings and Money Market		14,525.1			14,991.5
Savings Certificates and Other Time		1,869.0			1,874.4
Non U.S. Offices — Noninterest-Bearing		3,132.7			1,881.8
— Interest-Bearing		50,586.1			48,461.7
Total Deposits		91,722.5			84,098.1
Federal Funds Purchased		786.4			965.1
Securities Sold Under Agreements to Repurchase		866.8			917.3
Other Borrowings		1,758.3			1,558.6
Senior Notes		1,496.9			1,996.6
Long-Term Debt		1,598.7			1,709.2
Floating Rate Capital Debt		277.2			277.1
Other Liabilities		4,104.3			3,513.3
Total Liabilities		102,611.1			95,035.3
Stockholders’ Equity
Preferred Stock, No Par Value; Authorized 10,000,000 shares:
Series C, outstanding shares of 16,000 and 0		388.5			—
Common Stock, $1.66 2/3 Par Value; Authorized 560,000,000 shares;
Outstanding shares of 235,505,008 and 237,322,035		408.6			408.6
Additional Paid-In Capital		1,055.5			1,035.7
Retained Earnings		7,469.4			7,134.8
Accumulated Other Comprehensive Loss		(218.4	)		(244.3	)
Treasury Stock (9,666,516 and 7,849,489 shares, at cost)		(561.0	)		(422.8	)
Total Stockholders’ Equity		8,542.6			7,912.0
Total Liabilities and Stockholders’ Equity	$	111,153.7		$	102,947.3

See accompanying notes to the consolidated financial statements.

29

CONSOLIDATED STATEMENT OF INCOME (UNAUDITED) NORTHERN TRUST CORPORATION

	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions Except Share Information)	2014		2013			2014			2013
Noninterest Income
Trust, Investment and Other Servicing Fees	$	718.2	$	648.0		$	2,104.6		$	1,936.0
Foreign Exchange Trading Income		46.4		62.8			149.4			193.6
Treasury Management Fees		16.4		17.6			49.8			51.5
Security Commissions and Trading Income		14.2		16.8			46.7			53.4
Other Operating Income		34.1		67.2			112.3			128.3
Investment Security Gains (Losses), net (Note)		0.3		(2.2	)		(3.3	)		(1.9	)
Total Noninterest Income		829.6		810.2			2,459.5			2,360.9
Net Interest Income
Interest Income		293.8		291.1			883.0			853.1
Interest Expense		44.5		54.1			141.4			169.9
Net Interest Income		249.3		237.0			741.6			683.2
Provision for Credit Losses		—		5.0			3.0			15.0
Net Interest Income after Provision for Credit Losses		249.3		232.0			738.6			668.2
Noninterest Expense
Compensation		348.0		324.6			1,062.2			971.8
Employee Benefits		70.6		63.5			206.0			191.0
Outside Services		142.4		145.9			431.4			412.0
Equipment and Software		100.5		95.5			317.9			279.0
Occupancy		43.8		43.3			135.2			130.0
Other Operating Expense		69.4		67.9			201.0			215.5
Total Noninterest Expense		774.7		740.7			2,353.7			2,199.3
Income before Income Taxes		304.2		301.5			844.4			829.8
Provision for Income Taxes		99.7		95.0			276.6			268.2
Net Income	$	204.5	$	206.5		$	567.8		$	561.6
Net Income Applicable to Common Stock	$	204.5	$	206.5		$	567.8		$	561.6
Per Common Share
Net Income — Basic	$	0.85	$	0.85		$	2.36		$	2.31
— Diluted		0.84		0.84			2.34			2.29
Average Number of Common Shares Outstanding                      — Basic		235,701,076		239,930,074			236,301,789			239,614,868
— Diluted		237,737,129		241,330,652			238,175,696			240,857,697

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) NORTHERN TRUST CORPORATION

	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2014			2013			2014			2013
Net Income	$	204.5		$	206.5		$	567.8		$	561.6
Other Comprehensive Income (Net of Tax and Reclassifications)
Net Unrealized Gains (Losses) on Securities Available for Sale		(5.7	)		5.8			32.3			(74.4	)
Net Unrealized Gains (Losses) on Cash Flow Hedges		(7.4	)		4.3			(6.4	)		1.2
Foreign Currency Translation Adjustments		(3.6	)		(4.4	)		(10.5	)		(2.8	)
Pension and Other Postretirement Benefit Adjustments		3.5			7.1			10.5			21.1
Other Comprehensive Income (Loss)		(13.2	)		12.8			25.9			(54.9	)
Comprehensive Income	$	191.3		$	219.3		$	593.7		$	506.7
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		0.3			(2.2	)		0.6			(1.9	)
Investment Security Gains (Losses), net	$	0.3		$	(2.2	)	$	(3.3	)	$	(1.9	)

See accompanying notes to the consolidated financial statements.

30

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

	Nine Months Ended September 30,
(In Millions)	2014			2013
Preferred Stock
Balance at January 1	$	—		$	—
Issuance of Preferred Stock, Series C		388.5			—
Balance at September 30	$	388.5		$	—
Common Stock
Balance at January 1 and September 30	$	408.6		$	408.6
Additional Paid-in Capital
Balance at January 1		1,035.7			1,012.7
Treasury Stock Transactions — Stock Options and Awards		(55.0	)		(41.2	)
Stock Options and Awards — Amortization		60.4			57.4
Stock Options and Awards — Tax Benefits		14.4			2.9
Balance at September 30		1,055.5			1,031.8
Retained Earnings
Balance at January 1		7,134.8			6,702.7
Net Income		567.8			561.6
Dividends Declared — Common Stock		(233.2	)		(224.2	)
Balance at September 30		7,469.4			7,040.1
Accumulated Other Comprehensive Income (Loss)
Balance at January 1		(244.3	)		(283.0	)
Net Unrealized Gains (Losses) on Securities Available for Sale		32.3			(74.4	)
Net Unrealized Gains (Losses) on Cash Flow Hedges		(6.4	)		1.2
Foreign Currency Translation Adjustments		(10.5	)		(2.8	)
Pension and Other Postretirement Benefit Adjustments		10.5			21.1
Balance at September 30		(218.4	)		(337.9	)
Treasury Stock
Balance at January 1		(422.8	)		(314.0	)
Stock Options and Awards		177.0			175.6
Stock Purchased		(315.2	)		(187.1	)
Balance at September 30		(561.0	)		(325.5	)
Total Stockholders’ Equity at September 30	$	8,542.6		$	7,817.1

See accompanying notes to the consolidated financial statements.

31

CONSOLIDATED STATEMENT OF CASH FLOWS (UNAUDITED) NORTHERN TRUST CORPORATION

	Nine Months Ended September 30,
(In Millions)	2014			2013
Cash Flows from Operating Activities:
Net Income	$	567.8		$	561.6
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Investment Security Losses (Gains), net		3.3			1.9
Amortization and Accretion of Securities and Unearned Income, net		30.1			25.8
Provision for Credit Losses		3.0			15.0
Depreciation on Buildings and Equipment		68.0			69.5
(Gains) Losses on Sale of Buildings and Equipment		—			(32.6	)
Amortization of Computer Software		167.9			152.5
Amortization of Intangibles		14.7			15.5
Computer Software Write-Offs		9.5			—
Pension Plan Contributions		(13.9	)		(16.4	)
Change in Receivables		42.1			(27.9	)
Change in Interest Payable		(2.9	)		(14.7	)
Change in Collateral With Derivative Counterparties, net		163.1			111.0
Other Operating Activities, net		220.8			99.7
Net Cash Provided by Operating Activities		1,273.5			960.9
Cash Flows from Investing Activities:
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell		(480.4	)		(223.8	)
Change in Interest-Bearing Deposits with Banks		3,498.1			1,150.7
Net Change in Federal Reserve Deposits		(8,416.5	)		(833.2	)
Purchases of Securities — Held to Maturity		(5,596.9	)		(5,068.8	)
Proceeds from Maturity and Redemption of Securities — Held to Maturity		3,505.4			4,515.8
Purchases of Securities — Available for Sale		(8,969.2	)		(5,333.4	)
Proceeds from Sale, Maturity and Redemption of Securities — Available for Sale		9,254.9			6,359.2
Change in Loans and Leases		(1,352.0	)		387.6
Purchases of Buildings and Equipment		(51.0	)		(43.8	)
Proceeds from Sale of Buildings		—			38.8
Purchases and Development of Computer Software		(235.2	)		(203.8	)
Change in Client Security Settlement Receivables		(181.8	)		416.7
Other Investing Activities, net		(41.3	)		(652.0	)
Net Cash (Used in) Provided by Investing Activities		(9,065.9	)		510.0
Cash Flows from Financing Activities:
Change in Deposits		8,556.6			(2,845.7	)
Change in Federal Funds Purchased		(178.7	)		273.4
Change in Securities Sold under Agreements to Repurchase		(50.5	)		(230.8	)
Change in Short-Term Other Borrowings		33.4			1,382.4
Repayments of Senior Notes and Long-Term Debt		(638.7	)		(803.2	)
Contingent Consideration Liability Payment		(55.3	)		—
Proceeds from Issuance of Preferred Stock — Series C		388.5			—
Treasury Stock Purchased		(315.2	)		(186.8	)
Net Proceeds from Stock Options		122.0			134.1
Cash Dividends Paid on Common Stock		(225.4	)		(146.3	)
Other Financing Activities, net		(145.6	)		(2.9	)
Net Cash Provided by (Used in) Financing Activities		7,491.1			(2,425.8	)
Effect of Foreign Currency Exchange Rates on Cash		57.8			(107.1	)
Decrease in Cash and Due from Banks		(243.5	)		(1,062.0	)
Cash and Due from Banks at Beginning of Year		3,162.4			3,752.7
Cash and Due from Banks at End of Period	$	2,918.9		$	2,690.7
Supplemental Disclosures of Cash Flow Information:
Interest Paid	$	146.4		$	185.0
Income Taxes Paid		159.7			184.2
Transfers from Loans to OREO		10.0			16.4

See accompanying notes to the consolidated financial statements.

32

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 September 30, 2014, and 2013, 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. For a description of Northern Trust’s significant accounting policies, refer to Note 1 of the Notes to Consolidated Financial Statements in the 2013 Annual Report to Shareholders.

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, 2016. Northern Trust is currently assessing the impact of adoption of ASU 2014-09.

In August 2014, the FASB issued ASU No. 2014-14, “Receivables — Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force).” This ASU requires that a mortgage loan be derecognized and a separate receivable, measured based on the amount of the loan balance expected to be recovered from the guarantor, be recognized upon foreclosure if certain conditions are met. This ASU is effective for interim and annual reporting periods beginning after December 15, 2014. The adoption of this ASU is not expected to significantly impact Northern Trust’s consolidated financial position or results of operations.

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 nine months ended September 30, 2014, or the year ended December 31, 2013.

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

33

Notes to Consolidated Financial Statements (continued)

and, if the price is not able to be validated, an alternate pricing vendor is utilized, consistent with Northern Trust’s pricing source hierarchy. As of September 30, 2014, Northern Trust’s available for sale securities portfolio included 843 Level 2 securities with an aggregate market value of $24.6 billion. Of those, 842 securities, with an aggregate market value of $24.5 billion, were valued by external pricing vendors. The remaining security, with an aggregate market value of $88.0 million, was valued consistent with prices of similar securities as there were no vended prices available for that security. As of December 31, 2013, Northern Trust’s available for sale securities portfolio included 831 Level 2 securities with an aggregate market value of $26.4 billion. Of those, 829 securities, with an aggregate market value of $26.3 billion, were valued by external pricing vendors. The remaining 2 securities, with an aggregate market value of $57.4 million, were valued consistent with prices of similar securities as there were no vended prices available for these securities. Trading account securities, which totaled $4.3 million and $1.7 million as of September 30, 2014, and December 31, 2013, 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; credit spreads, default probabilities, and recovery rates for credit default swap contracts; interest rates for interest rate swap contracts and forward contracts; and interest rates and volatility inputs for interest rate option contracts. Northern Trust evaluates the impact of counterparty credit risk and its own credit risk on the valuation of its derivative instruments. Factors considered include the likelihood of default by Northern Trust and its counterparties, the remaining maturities of the instruments, net exposures after giving effect to master netting arrangements or similar agreements, available collateral, and other credit enhancements in determining the appropriate fair value of derivative instruments. The resulting valuation adjustments have not been considered material.

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

Northern Trust’s Level 3 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. Level 3 liabilities at December 31, 2013, consisted of acquisition-related contingent consideration liabilities, the fair value of which was determined using an income-based (discounted cash flow) model that incorporated

34

Notes to Consolidated Financial Statements (continued)

Northern Trust’s own assumptions about business growth rates and applicable discount rates, which represented unobservable inputs to the model. In April 2014, Northern Trust made a payment of $55.3 million to extinguish the contingent consideration liability at the value agreed by the parties.

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 Policy, Corporate Financial Management, and relevant business unit personnel) determine the valuation policies and procedures for Level 3 assets and liabilities. Each business and department represents a component of Northern Trust’s business units, and reports to management of their respective business units. 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 as of September 30, 2014.

Financial Instrument	Fair Value		Valuation Technique	Unobservable Inputs	Range of Lives and Rates
Auction Rate Securities	$	85.2 million	Discounted Cash Flow	Remaining lives Discount rates	1.7 — 8.6 years 0.2% — 7.9%

35

Notes to Consolidated Financial Statements (continued)

The following tables present assets and liabilities measured at fair value on a recurring basis as of September 30, 2014, and December 31, 2013, segregated by fair value hierarchy level.

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
September 30, 2014
Securities
Available for Sale
U.S. Government	$	3,409.6	$	—	$	—	$	—		$	3,409.6
Obligations of States and Political Subdivisions		—		4.6		—		—			4.6
Government Sponsored Agency		—		16,174.4		—		—			16,174.4
Non-U.S. Government		—		310.5		—		—			310.5
Corporate Debt		—		3,364.8		—		—			3,364.8
Covered Bonds		—		1,978.9		—		—			1,978.9
Supranational and Non-U.S. Agency Bonds		—		360.2		—		—			360.2
Residential Mortgage-Backed		—		17.6		—		—			17.6
Other Asset-Backed		—		2,233.1		—		—			2,233.1
Auction Rate		—		—		85.2		—			85.2
Other		—		168.8		—		—			168.8
Total Available for Sale		3,409.6		24,612.9		85.2		—			28,107.7
Trading Account		—		4.3		—		—			4.3
Total Available for Sale and Trading Securities		3,409.6		24,617.2		85.2		—			28,112.0
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		4,203.8		—		—			4,203.8
Interest Rate Contracts		—		213.5		—		—			213.5
Total Derivative Assets		—		4,417.3		—		(2,358.4	)		2,058.9
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		4,141.6		—		—			4,141.6
Interest Rate Swaps		—		123.5		—		—			123.5
Total Derivative Liabilities	$	—	$	4,265.1	$	—	$	(2,752.3	)	$	1,512.8

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of September 30, 2014, derivative assets and liabilities shown above also include reductions of $207.4 million and $601.3 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

36

Notes to Consolidated Financial Statements (continued)

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
December 31, 2013
Securities
Available for Sale
U.S. Government	$	1,917.9	$	—	$	—	$	—		$	1,917.9
Obligations of States and Political Subdivisions		—		4.6		—		—			4.6
Government Sponsored Agency		—		17,528.0		—		—			17,528.0
Non-U.S. Government		—		310.6		—		—			310.6
Corporate Debt		—		3,524.5		—		—			3,524.5
Covered Bonds		—		1,943.9		—		—			1,943.9
Supranational and Non-U.S. Agency Bonds		—		410.0		—		—			410.0
Residential Mortgage-Backed		—		48.1		—		—			48.1
Other Asset-Backed		—		2,391.8		—		—			2,391.8
Auction Rate		—		—		98.9		—			98.9
Other		—		214.5		—		—			214.5
Total Available for Sale		1,917.9		26,376.0		98.9		—			28,392.8
Trading Account		—		1.7		—		—			1.7
Total Available for Sale and Trading Securities		1,917.9		26,377.7		98.9		—			28,394.5
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		2,865.7		—		—			2,865.7
Interest Rate Contracts		—		237.9		—		—			237.9
Total Derivative Assets		—		3,103.6		—		(1,369.0	)		1,734.6
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		2,905.7		—		—			2,905.7
Interest Rate Swaps		—		195.2		—		—			195.2
Total Derivative Liabilities		—		3,100.9		—		(1,926.0	)		1,174.9
Contingent Consideration	$	—	$	—	$	55.4	$	—		$	55.4

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 December 31, 2013, derivative assets and liabilities shown above also include reductions of $210.7 million and $767.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

37

Notes to Consolidated Financial Statements (continued)

The following tables present the changes in Level 3 assets and liabilities for the three and nine months ended September 30, 2014, and 2013.

Level 3 Assets (In Millions)	Auction Rate Securities
Three Months Ended September 30,	2014			2013
Fair Value at July 1	$	98.8		$	99.1
Total Gains (Losses):
Included in Earnings		0.7			—
Included in Other Comprehensive Income (2)		0.1			0.3
Purchases, Issues, Sales, and Settlements:
Sales		(14.4	)		—
Fair Value at September 30	$	85.2		$	98.7

Nine Months Ended September 30,	2014			2013
Fair Value at January 1	$	98.9		$	97.8
Total Gains (Losses):
Included in Earnings (1)		0.7			0.1
Included in Other Comprehensive Income (2)		0.4			3.0
Purchases, Issues, Sales, and Settlements:
Sales		(14.4	)		—
Settlements		(0.4	)		(2.2	)
Fair Value at September 30	$	85.2		$	98.7

(1) Realized gains for the three and nine months ended September 30, 2014, of $0.7 million, represent gains from sales of securities. Realized gains for the nine month period ended September 30, 2013, of $0.1 million, represent gains from redemptions by issuers. Gains on sales are recorded in investment security gains (losses) and gains on redemptions are recorded in interest income, within the consolidated statement of income.

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

Level 3 Liabilities (In Millions)	Contingent Consideration
Three Months Ended September 30,	2014			2013
Fair Value at July 1	$	—		$	52.7
Total (Gains) Losses:
Included in Earnings (1)		—			1.3
Included in Other Comprehensive Income		—			—
Purchases, Issues, Sales, and Settlements		—			—
Fair Value at September 30	$	—		$	54.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at September 30 (1)	$	—		$	1.3
Nine Months Ended September 30,	2014			2013
Fair Value at January 1	$	55.4		$	50.1
Total (Gains) Losses:
Included in Earnings (1)		(0.1	)		3.9
Included in Other Comprehensive Income		—			—
Purchases, Issues, Sales, and Settlements:
Settlements		(55.3	)		—
Fair Value at September 30	$	—		$	54.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at September 30 (1)	$	—		$	3.9

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

38

Notes to Consolidated Financial Statements (continued)

During the nine months ended September 30, 2014, and 2013, 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 September 30, 2014, and 2013, 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. 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 $26.6 million and $1.5 million, respectively, at September 30, 2014, and $38.1 million and $1.6 million, respectively, at September 30, 2013. 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 September 30, 2014.

Financial Instrument	Fair Value	Valuation Technique	Unobservable Input	Range of Discounts Applied
Loans	$26.6 million	Market Approach	Discount to reflect realizable value	15% — 25%
OREO	$1.5 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 on Northern Trust’s consolidated balance sheet 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.

39

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.

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). As required by GAAP, the fair values required to be disclosed for demand, noninterest-bearing, savings, and money market deposits must equal the amounts disclosed in the consolidated balance sheet, even though such deposits are typically priced at a premium in banking industry consolidations.

40

Notes to Consolidated Financial Statements (continued)

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

(In Millions)	September 30, 2014
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	2,918.9	$	2,918.9	$	2,918.9	$	—	$	—
Federal Funds Sold and Resell Agreements		1,010.0		1,010.0		—		1,010.0		—
Interest-Bearing Deposits with Banks		15,334.5		15,334.5		—		15,334.5		—
Federal Reserve Deposits		21,328.0		21,328.0		—		21,328.0		—
Securities
Available for Sale (1)		28,107.7		28,107.7		3,409.6		24,612.9		85.2
Held to Maturity		4,196.7		4,195.1		—		4,195.1		—
Trading Account		4.3		4.3		—		4.3		—
Loans (excluding Leases)
Held for Investment		29,499.6		29,522.7		—		—		29,522.7
Held for Sale		2.1		2.1		—		—		2.1
Client Security Settlement Receivables		1,538.6		1,538.6		—		1,538.6		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		207.5		207.5		—		207.5		—
Community Development Investments		225.1		223.8		—		223.8		—
Employee Benefit and Deferred Compensation		145.2		147.4		97.4		50.0		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	39,267.4	$	39,267.4	$	39,267.4	$	—	$	—
Savings Certificates and Other Time		1,869.0		1,869.5		—		1,869.5		—
Non U.S. Offices Interest-Bearing		50,586.1		50,586.1		—		50,586.1		—
Federal Funds Purchased		786.4		786.4		—		786.4		—
Securities Sold under Agreements to Repurchase		866.8		866.8		—		866.8		—
Other Borrowings		1,758.3		1,758.9		—		1,758.9		—
Senior Notes		1,496.9		1,526.8		—		1,526.8		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,565.5		1,595.5		—		1,595.5		—
Federal Home Loan Bank Borrowings		—		—		—		—		—
Floating Rate Capital Debt		277.2		242.8		—		242.8		—
Other Liabilities
Standby Letters of Credit		57.0		57.0		—		—		57.0
Loan Commitments		28.7		28.7		—		—		28.7
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	71.0	$	71.0	$	—	$	71.0	$	—
Liabilities		16.1		16.1		—		16.1		—
Interest Rate Contracts
Assets		113.3		113.3		—		113.3		—
Liabilities		27.6		27.6		—		27.6		—
Client-Related and Trading
Foreign Exchange Contracts
Assets		4,132.8		4,132.8		—		4,132.8		—
Liabilities		4,125.5		4,125.5		—		4,125.5		—
Interest Rate Contracts
Assets		100.2		100.2		—		100.2		—
Liabilities		95.9		95.9		—		95.9		—

(1) Refer to the table located on page 36 for the disaggregation of available for sale securities.

41

Notes to Consolidated Financial Statements (continued)

(In Millions)	December 31, 2013
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	3,162.4	$	3,162.4	$	3,162.4	$	—	$	—
Federal Funds Sold and Resell Agreements		529.6		529.6		—		529.6		—
Interest-Bearing Deposits with Banks		19,397.4		19,397.4		—		19,397.4		—
Federal Reserve Deposits and Other Interest-Bearing		12,911.5		12,911.5		—		12,911.5		—
Securities
Available for Sale (1)		28,392.8		28,392.8		1,917.9		26,376.0		98.9
Held to Maturity		2,325.8		2,321.4		—		2,321.4		—
Trading Account		1.7		1.7		—		1.7		—
Loans (excluding Leases)
Held for Investment		28,136.5		28,147.2		—		—		28,147.2
Held for Sale		—		—		—		—		—
Client Security Settlement Receivables		1,355.2		1,355.2		—		1,355.2		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		194.7		194.7		—		194.7		—
Community Development Investments		228.1		227.8		—		227.8		—
Employee Benefit and Deferred Compensation		132.7		126.9		79.3		47.6		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	33,762.0	$	33,762.0	$	33,762.0	$	—	$	—
Savings Certificates and Other Time		1,874.4		1,877.1		—		1,877.1		—
Non U.S. Offices Interest-Bearing		48,461.7		48,461.7		—		48,461.7		—
Federal Funds Purchased		965.1		965.1		—		965.1		—
Securities Sold under Agreements to Repurchase		917.3		917.3		—		917.3		—
Other Borrowings		1,558.6		1,558.6		—		1,558.6		—
Senior Notes		1,996.6		1,989.3		—		1,989.3		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,537.3		1,563.5		—		1,563.5		—
Federal Home Loan Bank Borrowings		135.0		137.2		—		137.2		—
Floating Rate Capital Debt		277.1		230.2		—		230.2		—
Other Liabilities
Standby Letters of Credit		59.6		59.6		—		—		59.6
Contingent Consideration		55.4		55.4		—		—		55.4
Loan Commitments		35.7		35.7		—		—		35.7
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	21.0	$	21.0	$	—	$	21.0	$	—
Liabilities		59.5		59.5		—		59.5		—
Interest Rate Swaps
Assets		115.1		115.1		—		115.1		—
Liabilities		78.2		78.2		—		78.2		—
Client-Related and Trading
Foreign Exchange Contracts
Assets		2,844.7		2,844.7		—		2,844.7		—
Liabilities		2,846.2		2,846.2		—		2,846.2		—
Interest Rate Contracts
Assets		122.8		122.8		—		122.8		—
Liabilities		117.0		117.0		—		117.0		—

(1) Refer to the table located on page 37 for the disaggregation of available for sale securities.

42

Notes to Consolidated Financial Statements (continued)

4. Securities — The following tables provide the amortized cost and fair values of securities at September 30, 2014, and December 31, 2013.

Securities Available for Sale	September 30, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	3,395.1	$	16.0	$	1.5	$	3,409.6
Obligations of States and Political Subdivisions		4.5		0.1		—		4.6
Government Sponsored Agency		16,114.2		85.4		25.2		16,174.4
Non-U.S. Government		309.3		1.2		—		310.5
Corporate Debt		3,393.5		4.7		33.4		3,364.8
Covered Bonds		1,966.9		12.2		0.2		1,978.9
Supranational and Non-U.S. Agency Bonds		360.0		1.4		1.2		360.2
Residential Mortgage-Backed		18.8		0.1		1.3		17.6
Other Asset-Backed		2,232.0		1.3		0.2		2,233.1
Auction Rate		83.4		2.3		0.5		85.2
Other		168.5		0.3		—		168.8
Total	$	28,046.2	$	125.0	$	63.5	$	28,107.7

Securities Held to Maturity	September 30, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	138.8	$	8.5	$	—	$	147.3
Government Sponsored Agency		22.8		1.1		—		23.9
Non-U.S. Government		1,094.1		3.7		0.7		1,097.1
Certificates of Deposit		1,479.5		0.2		0.1		1,479.6
Supranational and Non-U.S. Agency Bonds		1,393.9		3.9		1.9		1,395.9
Other		67.6		—		16.3		51.3
Total	$	4,196.7	$	17.4	$	19.0	$	4,195.1

Securities Available for Sale	December 31, 2013
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	1,896.7	$	22.6	$	1.4	$	1,917.9
Obligations of States and Political Subdivisions		4.5		0.1		—		4.6
Government Sponsored Agency		17,495.2		80.7		47.9		17,528.0
Non-U.S. Government		307.0		3.6		—		310.6
Corporate Debt		3,615.2		10.5		101.2		3,524.5
Covered Bonds		1,898.9		50.9		5.9		1,943.9
Supranational and Non-U.S. Agency Bonds		410.0		1.7		1.7		410.0
Residential Mortgage-Backed		52.4		0.1		4.4		48.1
Other Asset-Backed		2,390.8		1.4		0.4		2,391.8
Auction Rate		97.5		2.2		0.8		98.9
Other		214.1		0.4		—		214.5
Total	$	28,382.3	$	174.2	$	163.7	$	28,392.8

43

Notes to Consolidated Financial Statements (continued)

Securities Held to Maturity	December 31, 2013
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	225.2	$	10.3	$	—	$	235.5
Government Sponsored Agency		35.9		1.1		—		37.0
Non-U.S. Government		722.0		0.8		1.1		721.7
Certificates of Deposit		698.1		—		0.2		697.9
Supranational and Non-U.S. Agency Bonds		584.7		—		3.2		581.5
Other		59.9		0.1		12.2		47.8
Total	$	2,325.8	$	12.3	$	16.7	$	2,321.4

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 September 30, 2014.

Remaining Maturity of Securities
(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	7,195.0	$	7,210.6
Due After One Year Through Five Years		16,637.9		16,677.9
Due After Five Years Through Ten Years		3,116.8		3,138.1
Due After Ten Years		1,096.5		1,081.1
Total		28,046.2		28,107.7
Held to Maturity
Due in One Year or Less		1,914.1		1,915.3
Due After One Year Through Five Years		2,222.2		2,230.5
Due After Five Years Through Ten Years		23.3		24.1
Due After Ten Years		37.1		25.2
Total	$	4,196.7	$	4,195.1

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 gains of $0.3 million were recognized in the three months ended September 30, 2014, representing net realized gains from the sale of securities. Net investment security losses of $2.2 million were recognized in the three months ended September 30, 2013, representing realized losses from the sale of securities. For the three months ended September 30, 2014, proceeds of $337.3 million were received from the sale of securities, representing gross realized gains and losses of $1.0 million and $0.7 million, respectively. For the three months ended September 30, 2013, proceeds of $316.4 million were received from the sale of securities, representing gross realized gains and losses of $0.1 million and $2.3 million, respectively.

Net investment security losses of $3.3 million were recognized in the nine months ended September 30, 2014, and include $3.9 million of charges related to the other-than-temporary impairment of certain Community Reinvestment Act (CRA) eligible held to maturity securities. Net investment security losses of $1.9 million were recognized in the nine months ended September 30, 2013, representing net realized losses from the sale of securities. For the nine months ended September 30, 2014, proceeds of $801.2 million were received from the sale of securities, representing gross realized gains and losses totaling $1.7 million and $1.1 million, respectively.

44

Notes to Consolidated Financial Statements (continued)

For the nine months ended September 30, 2013, proceeds of $398.1 million were received from the sale of securities, representing gross realized gains and losses totaling $0.4 million and $2.3 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 September 30, 2014, and December 31, 2013.

Securities with Unrealized Losses as of September 30, 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	$	1,596.0	$	1.5	$	—	$	—	$	1,596.0	$	1.5
Government Sponsored Agency		2,099.2		8.3		1,773.5		16.9		3,872.7		25.2
Non-U.S. Government		235.4		0.1		80.3		0.6		315.7		0.7
Corporate Debt		862.3		2.8		1,258.0		30.6		2,120.3		33.4
Covered Bonds		77.0		0.1		9.9		0.1		86.9		0.2
Supranational and Non-U.S. Agency Bonds		438.2		0.7		300.8		2.4		739.0		3.1
Residential Mortgage-Backed		—		—		15.0		1.3		15.0		1.3
Other Asset-Backed		485.2		0.1		7.1		0.1		492.3		0.2
Certificates of Deposit		552.0		0.1		—		—		552.0		0.1
Auction Rate		1.1		0.1		5.1		0.4		6.2		0.5
Other		13.0		8.5		43.4		7.8		56.4		16.3
Total	$	6,359.4	$	22.3	$	3,493.1	$	60.2	$	9,852.5	$	82.5

Securities with Unrealized Losses as of December 31, 2013	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	$	896.4	$	1.4	$	—	$	—	$	896.4	$	1.4
Government Sponsored Agency		4,340.8		42.6		413.7		5.3		4,754.5		47.9
Non-U.S. Government		176.7		1.1		—		—		176.7		1.1
Corporate Debt		1,759.5		85.4		267.0		15.8		2,026.5		101.2
Covered Bonds		278.8		5.7		9.9		0.2		288.7		5.9
Supranational and Non-U.S. Agency Bonds		612.7		4.9		—		—		612.7		4.9
Residential Mortgage-Backed		—		—		42.0		4.4		42.0		4.4
Other Asset-Backed		677.0		0.4		—		—		677.0		0.4
Certificates of Deposit		684.2		0.2		—		—		684.2		0.2
Auction Rate		22.1		0.1		14.0		0.7		36.1		0.8
Other		25.7		4.0		29.5		8.2		55.2		12.2
Total	$	9,473.9	$	145.8	$	776.1	$	34.6	$	10,250.0	$	180.4

As of September 30, 2014, 471 securities with a combined fair value of $9.9 billion were in an unrealized loss position, with their combined unrealized losses totaling $82.5 million. Unrealized losses of $33.4 million within corporate debt securities primarily reflect higher market rates since purchase; 40% of the corporate debt portfolio is backed by guarantees provided by U.S. and non-U.S. governmental entities. Unrealized losses of $25.2 million related to government sponsored agency securities are primarily attributable to changes in market rates since their purchase.

Unrealized losses on residential mortgage-backed securities totaling $1.3 million reflect the impact of wider credit and liquidity spreads on the valuations of two residential mortgage-backed securities since purchase, with both having been in an unrealized loss position for more than 12 months. Securities classified as “other asset-backed” had average lives less than 5 years, and 100% were rated triple-A.

45

Notes to Consolidated Financial Statements (continued)

The majority of the $16.3 million of unrealized losses in securities classified as “other” at September 30, 2014, relate to securities primarily purchased at a premium or par by Northern Trust for compliance with CRA. Unrealized losses on these CRA related securities are 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 $0.5 million related to auction rate securities primarily reflect reduced market liquidity as a majority of auctions continue to fail preventing holders from liquidating their investments at par. The remaining unrealized losses on Northern Trust’s securities portfolio as of September 30, 2014, are attributable to changes in overall market interest rates, increased credit spreads, or reduced market liquidity. As of September 30, 2014, Northern Trust does not intend to sell any investment in an unrealized loss position and it is not more likely than not that Northern Trust will 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 following describes Northern Trust’s process for identifying credit impairment within non-agency residential mortgage-backed securities, the security type for which Northern Trust has previously recognized the majority of its OTTI. To determine if an unrealized loss on a non-agency residential mortgage-backed security is other-than-temporary, economic models are used to perform cash flow analyses by developing multiple scenarios in order to create reasonable forecasts of the security’s future performance using available data including servicers’ loan charge off patterns, prepayment speeds, annualized default rates, each security’s current delinquency pipeline, the delinquency pipeline’s growth rate, the roll rate from delinquency to default, loan loss severities and historical performance of like collateral, along with Northern Trust’s outlook for the housing market and the overall economy. If the present value of future cash flows projected as a result of this analysis is less than the current amortized cost of the security, a credit-related OTTI loss is recorded in earnings equal to the difference between the two amounts.

Impairments of non-agency residential mortgage-backed securities are influenced by a number of factors, including but not limited to, U.S. economic and housing market performance, security credit enhancement level, insurance coverage, year of origination, and type of collateral. The factors used in estimating losses on non-agency residential mortgage-backed securities vary by year of origination and type of collateral.

46

Notes to Consolidated Financial Statements (continued)

As of September 30, 2014, loss estimates for subprime, Alt-A, prime and 2nd lien collateral portfolios were developed using default roll rates, determined primarily by the stage of delinquency of the underlying instrument, that generally assumed ultimate default rates approximating 5% to 30% for current loans; 30% for loans 30 to 60 days delinquent; 80% for loans 60 to 90 days delinquent; 90% for loans delinquent greater than 90 days; and 100% for OREO properties and loans that are in foreclosure. Amortized cost, weighted average ultimate default rates, and impairment severity rates for the non-agency residential mortgage-backed securities portfolio, by security type as of September 30, 2014, are provided in the following table.

($ In Millions)	September 30, 2014
	Amortized Cost		Weighted Average Ultimate Default Rates			Loss Severity Rates
Security Type						Low			High			Weighted Average
Prime	$	2.0		5.4	%		32.1	%		32.1	%		32.1	%
Alt-A		11.2		40.0			62.8			62.8			62.8
2nd Lien		5.6		32.7			98.7			99.0			99.0
Total Non-Agency Residential Mortgage-Backed Securities	$	18.8		33.1	%		32.1	%		99.0	%		70.3	%

Northern Trust’s processes for identifying credit impairment within auction rate securities are largely consistent with the processes utilized for non-agency residential mortgage-backed securities and include analyses of expected loss severities and default rates adjusted for the type of underlying loan and the presence of government guarantees, as applicable.

The process for identifying credit impairment within CRA eligible mortgage-backed securities incorporates an expected loss approach using discounted cash flows on the underlying collateral pools. To evaluate whether an unrealized loss on CRA 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 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 mortgage-backed securities vary by vintage of loan origination and collateral quality.

There were no OTTI losses recognized in the three months ended September 30, 2014, or in the three or nine months ended September 30, 2013. There were $3.9 million of OTTI losses recognized during the nine months ended September 30, 2014, related to CRA eligible mortgage-backed securities.

47

Notes to Consolidated Financial Statements (continued)

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 nine months ended September 30, 2014, and 2013.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014			2013
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 other-than-temporary impairments in the respective 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 other-than-temporary impairments in the respective period, the balance includes the portion of the excess of amortized cost over the fair value of the impaired securities that was recorded in 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.

	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	2014			2013		2014			2013
Cumulative Credit-Related Losses on Securities Held — Beginning of Period	$	12.7		$	8.8	$	8.8		$	42.3
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		(1.8	)		—		(1.8	)		(33.5	)
Cumulative Credit-Related Losses on Securities Held — End of Period	$	10.9		$	8.8	$	10.9		$	8.8

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

(In Millions)	September 30, 2014			December 31, 2013
Commercial
Commercial and Institutional	$	8,212.1		$	7,375.8
Commercial Real Estate		3,107.7			2,955.8
Lease Financing, net		952.5			975.1
Non-U.S.		1,408.4			954.7
Other		187.9			358.6
Total Commercial		13,868.6			12,620.0
Personal
Residential Real Estate		9,872.7			10,271.3
Private Client		6,953.1			6,445.6
Other		25.5			48.6
Total Personal		16,851.3			16,765.5
Total Loans and Leases		30,719.9			29,385.5
Allowance for Credit Losses Assigned to Loans and Leases		(269.4	)		(278.1	)
Net Loans and Leases	$	30,450.5		$	29,107.4

48

Notes to Consolidated Financial Statements (continued)

Residential real estate loans consist of traditional first lien mortgages and equity credit lines that generally require a loan to collateral value of no more than 65% to 80% at inception. Northern Trust’s equity credit line products generally have draw periods of up to 10 years and a balloon payment of any outstanding balance is due at maturity. Payments are interest only with variable interest rates. Northern Trust does not offer equity credit lines that include an option to convert the outstanding balance to an amortizing payment loan.

As of September 30, 2014, and December 31, 2013, equity credit lines totaled $1.8 billion and $2.0 billion, respectively, and equity credit lines for which first liens were held by Northern Trust represented 88% and 87%, respectively, of the total equity credit lines as 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 September 30, 2014, and $1.3 billion at December 31, 2013. Demand deposits reclassified as loan balances totaled $109.0 million and $104.1 million at September 30, 2014, and December 31, 2013, respectively. Loans classified as held for sale totaled $2.1 million at September 30, 2014. There were no loans classified as held for sale at December 31, 2013.

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, 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, return on assets, asset size, and capital levels;

• Commercial Real Estate: debt service coverage and leasing status for income-producing properties; loan-to-value and loan-to-cost ratios, leasing status, and guarantor support for loans associated with construction and development properties;

• Lease Financing and Commercial-Other: leverage and profit margin levels;

• Non-U.S.: entity type, liquidity, size, and leverage;

• Residential Real Estate: payment history, credit bureau scores, and cash flow-to-debt and net worth ratios;

• Private Client: cash flow-to-debt and net worth ratios, leverage, and profit margin levels; 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.

49

Notes to Consolidated Financial Statements (continued)

Loan and lease segment and class balances as of September 30, 2014, and December 31, 2013, are provided below, segregated by borrower ratings into “1 to 3”, “4 to 5” and “6 to 9” (watch list), categories.

	September 30, 2014								December 31, 2013
(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	$	5,115.4	$	2,983.6	$	113.1	$	8,212.1	$	4,432.5	$	2,801.5	$	141.8	$	7,375.8
Commercial Real Estate		1,263.6		1,718.2		125.9		3,107.7		1,053.7		1,748.7		153.4		2,955.8
Lease Financing, net		572.2		376.1		4.2		952.5		685.7		285.0		4.4		975.1
Non-U.S.		643.7		763.8		0.9		1,408.4		442.8		511.9		—		954.7
Other		137.4		50.5		—		187.9		157.7		200.9		—		358.6
Total Commercial		7,732.3		5,892.2		244.1		13,868.6		6,772.4		5,548.0		299.6		12,620.0
Personal
Residential Real Estate		2,995.7		6,439.9		437.1		9,872.7		3,204.6		6,563.6		503.1		10,271.3
Private Client		4,461.8		2,479.9		11.4		6,953.1		3,957.6		2,481.2		6.8		6,445.6
Other		18.6		6.9		—		25.5		21.2		27.4		—		48.6
Total Personal		7,476.1		8,926.7		448.5		16,851.3		7,183.4		9,072.2		509.9		16,765.5
Total Loans and Leases	$	15,208.4	$	14,818.9	$	692.6	$	30,719.9	$	13,955.8	$	14,620.2	$	809.5	$	29,385.5

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. At the time a loan is determined to be nonperforming, interest accrued but not collected is reversed against interest income of the current period and the loan is classified as nonperforming. 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

50

Notes to Consolidated Financial Statements (continued)

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 other real estate owned and nonperforming asset balances, as of September 30, 2014, and December 31, 2013.

September 30, 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	$	8,153.8	$	10.2	$	13.3	$	3.1	$	8,180.4	$	31.7	$	8,212.1
Commercial Real Estate		3,044.4		7.8		5.2		10.4		3,067.8		39.9		3,107.7
Lease Financing, net		952.5		—		—		—		952.5		—		952.5
Non-U.S.		1,408.4		—		—		—		1,408.4		—		1,408.4
Other		187.9		—		—		—		187.9		—		187.9
Total Commercial		13,747.0		18.0		18.5		13.5		13,797.0		71.6		13,868.6
Personal
Residential Real Estate		9,702.1		7.9		9.0		6.4		9,725.4		147.3		9,872.7
Private Client		6,917.8		21.1		7.4		5.2		6,951.5		1.6		6,953.1
Other		25.5		—		—		—		25.5		—		25.5
Total Personal		16,645.4		29.0		16.4		11.6		16,702.4		148.9		16,851.3
Total Loans and Leases	$	30,392.4	$	47.0	$	34.9	$	25.1	$	30,499.4	$	220.5	$	30,719.9
								Other Real Estate Owned				10.7
								Total Nonperforming Assets			$	231.2

51

Notes to Consolidated Financial Statements (continued)

December 31, 2013
(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	$	7,332.3	$	5.0	$	12.1	$	3.3	$	7,352.7	$	23.1	$	7,375.8
Commercial Real Estate		2,881.1		4.1		14.6		6.8		2,906.6		49.2		2,955.8
Lease Financing, net		975.1		—		—		—		975.1		—		975.1
Non-U.S.		954.7		—		—		—		954.7		—		954.7
Other		358.6		—		—		—		358.6		—		358.6
Total Commercial		12,501.8		9.1		26.7		10.1		12,547.7		72.3		12,620.0
Personal
Residential Real Estate		9,934.4		129.3		15.6		2.9		10,082.2		189.1		10,271.3
Private Client		6,404.2		29.1		7.5		3.4		6,444.2		1.4		6,445.6
Other		48.6		—		—		—		48.6		—		48.6
Total Personal		16,387.2		158.4		23.1		6.3		16,575.0		190.5		16,765.5
Total Loans and Leases	$	28,889.0	$	167.5	$	49.8	$	16.4	$	29,122.7	$	262.8	$	29,385.5
								Other Real Estate Owned				11.9
								Total Nonperforming Assets			$	274.7

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. 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.

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.

52

Notes to Consolidated Financial Statements (continued)

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

	As of September 30, 2014						As of December 31, 2013
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Allowance		Recorded Investment		Unpaid Principal Balance		Specific Allowance
With No Related Specific Allowance
Commercial and Institutional	$	11.6	$	14.6	$	—	$	12.2	$	18.1	$	—
Commercial Real Estate		49.2		54.9		—		46.6		57.1		—
Lease Financing, net		4.2		4.2		—		4.4		4.4		—
Residential Real Estate		170.2		214.5		—		185.0		227.8		—
Private Client		0.1		0.4		—		0.8		0.8		—
With a Related Specific Allowance
Commercial and Institutional		20.5		20.5		5.1		9.6		12.1		3.6
Commercial Real Estate		12.4		18.4		3.5		26.7		31.5		4.5
Residential Real Estate		1.3		1.5		0.4		8.1		8.7		2.3
Private Client		0.9		0.9		0.5		—		—		—
Total
Commercial		97.9		112.6		8.6		99.5		123.2		8.1
Personal		172.5		217.3		0.9		193.9		237.3		2.3
Total	$	270.4	$	329.9	$	9.5	$	293.4	$	360.5	$	10.4

	Three Months Ended September 30,								Nine Months Ended September 30,
	2014				2013				2014				2013
(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	$	12.6	$	0.1	$	10.7	$	—	$	11.5	$	0.1	$	11.3	$	0.1
Commercial Real Estate		48.5		0.2		42.0		0.2		46.0		0.7		40.6		0.6
Lease Financing, net		4.3		0.1		4.5		0.1		4.3		0.2		4.6		0.2
Residential Real Estate		172.0		0.8		168.1		0.3		180.8		2.1		155.2		1.4
Private Client		0.3		—		13.3		0.2		0.6		—		12.0		0.5
With a Related Specific Allowance
Commercial and Institutional		11.9		—		14.1		—		10.6		—		12.5		—
Commercial Real Estate		13.7		—		31.2		—		20.9		—		31.6		—
Residential Real Estate		1.3		—		10.0		—		4.1		—		9.4		—
Private Client		0.9		—		0.8		—		0.5		—		1.1		—
Total
Commercial		91.0		0.4		102.5		0.3		93.3		1.0		100.6		0.9
Personal		174.5		0.8		192.2		0.5		186.0		2.1		177.7		1.9
Total	$	265.5	$	1.2	$	294.7	$	0.8	$	279.3	$	3.1	$	278.3	$	2.8

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

53

Notes to Consolidated Financial Statements (continued)

Interest income that would have been recorded for nonperforming loans in accordance with their original terms was $2.2 million and $2.8 million, respectively, for the three months ended September 30, 2014, and 2013, and $7.1 million and $8.0 million, respectively, for the nine months ended September 30, 2014, and 2013.

There were $3.5 million and $3.4 million of aggregate undrawn loan commitments and standby letters of credit at September 30, 2014, and December 31, 2013, respectively, issued to borrowers whose loans were classified as nonperforming or impaired.

Troubled Debt Restructurings (TDRs). Included within impaired loans were $58.6 million and $72.7 million of nonperforming TDRs, and $96.9 million and $89.8 million of performing TDRs as of September 30, 2014, and December 31, 2013, 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.

54

Notes to Consolidated Financial Statements (continued)

The following tables provide, by segment and class, the number of loans and leases modified in TDRs during the three and nine month periods ended September 30, 2014, and 2013, and the recorded investments and unpaid principal balances as of September 30, 2014, and 2013.

($ In Millions)	Three Months Ended September 30, 2014						Nine Months Ended September 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		1	$	0.4	$	0.4		3	$	0.7	$	0.8
Commercial Real Estate		5		2.9		3.4		6		3.5		4.1
Total Commercial		6		3.3		3.8		9		4.2		4.9
Personal
Residential Real Estate		28		18.0		18.7		96		25.3		27.1
Private Client		—		—		—		3		—		0.3
Total Personal		28		18.0		18.7		99		25.3		27.4
Total Loans and Leases		34	$	21.3	$	22.5		108	$	29.5	$	32.3

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

($ In Millions)	Three Months Ended September 30, 2013						Nine Months Ended September 30, 2013
	Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance		Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance
Commercial
Commercial and Institutional		—	$	—	$	—		7	$	0.5	$	1.0
Commercial Real Estate		7		22.8		25.0		11		27.4		31.9
Total Commercial		7		22.8		25.0		18		27.9		32.9
Personal
Residential Real Estate		38		6.7		11.4		122		51.2		59.8
Private Client		—		—		—		6		12.8		12.8
Total Personal		38		6.7		11.4		128		64.0		72.6
Total Loans and Leases		45	$	29.5	$	36.4		146	$	91.9	$	105.5

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 nine months ended September 30, 2014, the majority of TDR modifications of loans within the commercial real estate, residential real estate, and private client classes were extensions of term and/or other modifications. During the three and nine months ended September 30, 2013, TDR modifications of loans within the commercial and institutional, commercial real estate, and private client classes were primarily deferrals of principal; extensions of term, and other modifications, and modifications of loans within the residential real estate class were primarily deferrals of principal, interest rate concessions, extensions of term, and other modifications.

55

Notes to Consolidated Financial Statements (continued)

There were no loans or leases modified in TDRs in the 12 months ended June 30, 2014 or 2013, which subsequently became nonperforming during the three or nine months ended September 30, 2014 or 2013 respectively.

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.

6. 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 Allowance 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 nine months ended September 30, 2014, and 2013.

	Three Months Ended September 30,
	2014									2013
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	168.7		$	134.8		$	303.5		$	184.1		$	136.6		$	320.7
Charge-Offs		(2.5	)		(6.1	)		(8.6	)		(1.7	)		(9.9	)		(11.6	)
Recoveries		1.9			1.5			3.4			1.7			1.6			3.3
Net (Charge-Offs) Recoveries		(0.6	)		(4.6	)		(5.2	)		—			(8.3	)		(8.3	)
Provision for Credit Losses		1.0			(1.0	)		—			(4.6	)		9.6			5.0
Effect of Foreign Exchange Rates		—			—			—			0.1			—			0.1
Balance at End of Period	$	169.1		$	129.2		$	298.3		$	179.6		$	137.9		$	317.5

56

Notes to Consolidated Financial Statements (continued)

	Nine Months Ended September 30,
	2014									2013
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	168.0		$	139.9		$	307.9		$	194.2		$	133.4		$	327.6
Charge-Offs		(8.8	)		(19.1	)		(27.9	)		(6.9	)		(32.9	)		(39.8	)
Recoveries		10.7			4.6			15.3			8.1			6.6			14.7
Net (Charge-Offs) Recoveries		1.9			(14.5	)		(12.6	)		1.2			(26.3	)		(25.1	)
Provision for Credit Losses		(0.8	)		3.8			3.0			(15.8	)		30.8			15.0
Effect of Foreign Exchange Rates		—			—			—			—			—			—
Balance at End of Period	$	169.1		$	129.2		$	298.3		$	179.6		$	137.9		$	317.5

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 September 30, 2014, and December 31, 2013.

	September 30, 2014						December 31, 2013
(In Millions)	Commercial		Personal		Total		Commercial		Personal		Total
Loans and Leases
Specifically Evaluated for Impairment	$	97.9	$	172.5	$	270.4	$	99.5	$	193.9	$	293.4
Evaluated for Inherent Impairment		13,770.7		16,678.8		30,449.5		12,520.5		16,571.6		29,092.1
Total Loans and Leases		13,868.6		16,851.3		30,719.9		12,620.0		16,765.5		29,385.5
Allowance for Loans and Leases
Specifically Evaluated for Impairment		8.6		0.9		9.5		8.1		2.3		10.4
Evaluated for Inherent Impairment		134.5		125.4		259.9		132.8		134.9		267.7
Allowance Assigned to Loans and Leases		143.1		126.3		269.4		140.9		137.2		278.1
Allowance for Unfunded Exposures
Commitments and Standby Letters of Credit		26.0		2.9		28.9		27.1		2.7		29.8
Total Allowance for Credit Losses	$	169.1	$	129.2	$	298.3	$	168.0	$	139.9	$	307.9

7. Pledged Assets — Certain of Northern Trust’s subsidiaries, as required or permitted by law, pledge assets to secure public and trust deposits; repurchase agreements; Federal Home Loan Bank borrowings; and for other purposes, including support for securities settlement, primarily related to client activities, and for potential Federal Reserve Bank discount window borrowings. At September 30, 2014, securities and loans totaling $32.4 billion ($23.5 billion of government sponsored agency and other securities, $137.0 million of obligations of states and political subdivisions, and $8.8 billion of loans) were pledged. This compares to $32.4 billion ($22.6 billion of government sponsored agency and other securities, $222.7 million of obligations of states and political subdivisions, and $9.6 billion of loans) at December 31, 2013. Collateral required for these purposes totaled $3.5 billion and $5.0 billion at September 30, 2014, and December 31, 2013, respectively. Included in the total pledged assets at September 30, 2014, and December 31, 2013 were available for sale securities with a total fair value of $865.5 million and $915.3 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 as of September 30, 2014, and December 31, 2013, was $1.0 billion and $500.0 million, respectively. There was no repledged or sold collateral at September 30, 2014, or December 31, 2013. Deposits maintained to meet Federal Reserve Bank reserve requirements averaged $1.3 billion for the three and nine months ended September 30, 2014, and $0.9 billion for both the three and nine months ended September 30, 2013.

57

Notes to Consolidated Financial Statements (continued)

8. Goodwill and Other Intangibles — The carrying amounts of goodwill, reflecting the effect of foreign exchange rates on non-U.S. dollar denominated balances, by business unit at September 30, 2014, and December 31, 2013, were as follows:

(In Millions)	September 30, 2014		December 31, 2013
Corporate & Institutional Services	$	466.6	$	469.2
Wealth Management		71.5		71.5
Total Goodwill	$	538.1	$	540.7

The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of September 30, 2014, and December 31, 2013, were as follows:

(In Millions)	September 30, 2014		December 31, 2013
Gross Carrying Amount	$	193.4	$	198.2
Less: Accumulated Amortization		127.6		115.2
Net Book Value	$	65.8	$	83.0

Other intangible assets consist primarily of the value of acquired client relationships and are included within other assets on the consolidated balance sheet. Amortization expense related to other intangible assets totaled $4.8 million and $14.7 million for the three and nine months ended September 30, 2014, respectively, and $5.2 million and $15.5 million for the three and nine months ended September 30, 2013, respectively. Amortization for the remainder of 2014 and for the years 2015, 2016, 2017, and 2018 is estimated to be $4.8 million, $11.5 million, $9.0 million, $8.9 million and $8.2 million, respectively.

9. Issuance of Preferred Stock — Northern Trust is authorized to issue 10 million shares of preferred stock, without par value.

On August 5, 2014, Northern Trust issued 16 million depositary shares, each representing 1/1000 ownership interest in a share of Northern Trust’s Series C Non-Cumulative Perpetual Preferred Stock (“Series C Preferred Stock”), without par value, with a liquidation preference of $25,000 ($25 per depositary share). The aggregate proceeds from the public offering of the depositary shares, net of underwriting discounts, commissions and offering expenses, were $388.5 million.

Dividends on the Series C Preferred Stock, which are not mandatory, will accrue and be payable on the liquidation preference amount, on a non-cumulative basis, quarterly in arrears on the first day of January, April, July and October of each year, commencing on January 1, 2015, at a rate per annum equal to 5.85%. On October 21, 2014, Northern Trust declared a cash dividend of $593.125 per share of Series C Preferred Stock payable on January 1, 2015 to stockholders of record on December 15, 2014.

The Series C Preferred Stock has no maturity date. Shares of the Series C Preferred Stock rank senior to Northern Trust’s common stock, and will rank at least equally with any other series of preferred stock we may issue (except for any senior series that may be issued with the requisite consent of the holders of the Series C Preferred Stock) and all other parity stock, with respect to the payment of dividends and distributions upon liquidation, dissolution or winding up.

The Series C Preferred Stock is redeemable at Northern Trust’s option, in whole or in part, on any dividend payment date on or after October 1, 2019. The Series C Preferred stock is redeemable at the Company’s option, in whole, but not in part, prior to October 1, 2019 within 90 days of a regulatory capital treatment event, as described in the Series C Preferred Stock Certificate of Designation.

58

Notes to Consolidated Financial Statements (continued)

10. Business Units — The following tables show the earnings contributions of Northern Trust’s business units for the three and nine month periods ended September 30, 2014, and 2013.

Three Months Ended September 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2014			2013			2014			2013			2014			2013			2014			2013
Noninterest Income
Trust, Investment and Other Servicing Fees	$	399.9		$	359.8		$	318.3		$	288.2		$	—		$	—		$	718.2		$	648.0
Foreign Exchange Trading Income		44.4			61.8			2.0			1.0			—			—			46.4			62.8
Other Noninterest Income		42.8			44.3			20.9			54.3			1.3			0.8			65.0			99.4
Net Interest Income*		78.4			70.1			131.2			136.3			46.6			38.4			256.2			244.8
Revenue*		565.5			536.0			472.4			479.8			47.9			39.2			1,085.8			1,055.0
Provision for Credit Losses		0.9			0.4			(0.9	)		4.6			—			—			—			5.0
Noninterest Expense		429.6			412.0			312.1			297.3			33.0			31.4			774.7			740.7
Income before Income Taxes*		135.0			123.6			161.2			177.9			14.9			7.8			311.1			309.3
Provision (Benefit) for Income Taxes*		42.4			38.8			60.7			67.0			3.5			(3.0	)		106.6			102.8
Net Income	$	92.6		$	84.8		$	100.5		$	110.9		$	11.4		$	10.8		$	204.5		$	206.5
Percentage of Consolidated Net Income		45	%		41	%		49	%		54	%		6	%		5	%		100	%		100	%
Average Assets	$	59,907.1		$	53,653.5		$	26,061.8		$	22,923.6		$	19,275.8		$	18,635.4		$	105,244.7		$	95,212.5

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $6.9 million for 2014 and $7.8 million for 2013.

Nine Months Ended September 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2014			2013			2014			2013			2014			2013			2014			2013
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,174.5		$	1,072.7		$	930.1		$	863.3		$	—		$	—		$	2,104.6		$	1,936.0
Foreign Exchange Trading Income		143.2			189.8			6.2			3.8			—			—			149.4			193.6
Other Noninterest Income		134.3			130.1			66.7			95.8			4.5			5.4			205.5			231.3
Net Interest Income*		228.8			200.2			398.8			425.3			136.4			81.0			764.0			706.5
Revenue*		1,680.8			1,592.8			1,401.8			1,388.2			140.9			86.4			3,223.5			3,067.4
Provision for Credit Losses		4.5			(1.1	)		(1.5	)		16.1			—			—			3.0			15.0
Noninterest Expense		1,299.5			1,206.7			960.3			900.9			93.9			91.7			2,353.7			2,199.3
Income (loss) before Income Taxes*		376.8			387.2			443.0			471.2			47.0			(5.3	)		866.8			853.1
Provision (Benefit) for Income Taxes*		113.3			123.0			166.9			177.8			18.8			(9.3	)		299.0			291.5
Net Income	$	263.5		$	264.2		$	276.1		$	293.4		$	28.2		$	4.0		$	567.8		$	561.6
Percentage of Consolidated Net Income		46	%		47	%		49	%		52	%		5	%		1	%		100	%		100	%
Average Assets	$	59,061.3		$	52,323.8		$	23,613.4		$	22,863.1		$	20,281.1		$	18,036.6		$	102,955.8		$	93,223.5

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $22.4 million for 2014 and $23.3 million for 2013.

Further discussion of business unit results is provided within the “Business Unit Reporting” section of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

59

Notes to Consolidated Financial Statements (continued)

11. Accumulated Other Comprehensive Income (Loss) — The following tables summarize the components of accumulated other comprehensive income (loss) at September 30, 2014, and 2013, and changes during the three and nine month periods then ended.

(In Millions)	Balance at December 31, 2013			Net Change			Balance at September 30, 2014
Net Unrealized Gains (Losses) on Securities Available for Sale	$	6.0		$	32.3		$	38.3
Net Unrealized Gains (Losses) on Cash Flow Hedges		2.9			(6.4	)		(3.5	)
Net Foreign Currency Adjustments		7.1			(10.5	)		(3.4	)
Net Pension and Other Postretirement Benefit Adjustments		(260.3	)		10.5			(249.8	)
Total	$	(244.3	)	$	25.9		$	(218.4	)

(In Millions)	Balance at December 31, 2012			Net Change			Balance at September 30, 2013
Net Unrealized Gains (Losses) on Securities Available for Sale	$	101.0		$	(74.4	)	$	26.6
Net Unrealized Gains (Losses) on Cash Flow Hedges		(1.4	)		1.2			(0.2	)
Net Foreign Currency Adjustments		10.5			(2.8	)		7.7
Net Pension and Other Postretirement Benefit Adjustments		(393.1	)		21.1			(372.0	)
Total	$	(283.0	)	$	(54.9	)	$	(337.9	)

	Three Months Ended September 30,
	2014									2013
(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 Gains (Losses) on Securities OTTI	$	5.5		$	(2.1	)	$	3.4		$	—		$	—		$	—
Other Unrealized Gains (Losses) on Securities Available for Sale		(14.2	)		5.4			(8.8	)		7.3			(2.8	)		4.5
Reclassification Adjustment for (Gains) Losses Included in Net Income		(0.3	)		—			(0.3	)		2.1			(0.8	)		1.3
Net Change		(9.0	)		3.3			(5.7	)		9.4			(3.6	)		5.8
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		(7.6	)		2.5			(5.1	)		5.3			(1.7	)		3.6
Reclassification Adjustment for (Gains) Losses Included in Net Income		(3.7	)		1.4			(2.3	)		1.1			(0.4	)		0.7
Net Change		(11.3	)		3.9			(7.4	)		6.4			(2.1	)		4.3
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		(77.1	)		6.6			(70.5	)		55.0			(4.0	)		51.0
Long-Term Intra-Entity Foreign Currency Transaction Losses		(7.4	)		—			(7.4	)		—			—			—
Net Investment Hedge Gains (Losses)		119.9			(45.6	)		74.3			(88.8	)		33.4			(55.4	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		35.4			(39.0	)		(3.6	)		(33.8	)		29.4			(4.4	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		6.5			(3.0	)		3.5			11.3			(4.2	)		7.1
Net Change	$	6.5		$	(3.0	)	$	3.5		$	11.3		$	(4.2	)	$	7.1

60

Notes to Consolidated Financial Statements (continued)

	Nine Months Ended September 30,
	2014									2013
(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 Gains (Losses) on Securities OTTI	$	3.7		$	(1.4	)	$	2.3		$	2.1		$	(0.8	)	$	1.3
Other Unrealized Gains (Losses) on Securities Available for Sale		48.8			(18.2	)		30.6			(123.2	)		46.3			(76.9	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		(0.6	)		—			(0.6	)		1.9			(0.7	)		1.2
Net Change		51.9			(19.6	)		32.3			(119.2	)		44.8			(74.4	)
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		(6.5	)		2.2			(4.3	)		(4.0	)		1.6			(2.4	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		(3.3	)		1.2			(2.1	)		5.7			(2.1	)		3.6
Net Change		(9.8	)		3.4			(6.4	)		1.7			(0.5	)		1.2
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		(57.2	)		6.0			(51.2	)		5.3			(2.3	)		3.0
Long-Term Intra-Entity Foreign Currency Transaction Losses		(9.0	)		—			(9.0	)		—			—			—
Net Investment Hedge Gains (Losses)		79.7			(30.0	)		49.7			(9.3	)		3.5			(5.8	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		13.5			(24.0	)		(10.5	)		(4.0	)		1.2			(2.8	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		19.0			(8.5	)		10.5			33.7			(12.6	)		21.1
Net Change	$	19.0		$	(8.5	)	$	10.5		$	33.7		$	(12.6	)	$	21.1

The following table provides the location and before-tax amounts of reclassifications out of accumulated other comprehensive income (loss) during the three and nine months ended September 30, 2014.

(In Millions)	Location of Reclassification Adjustments Recognized in Income	Amount of Reclassification Adjustments Recognized in Income
		Three Months Ended			Nine Months Ended
		September 30, 2014
Securities Available for Sale
Realized (Gains) Losses on Securities Available for Sale	Investment Security Gains (Losses), net	$	(0.3	)	$	(0.6	)
Realized (Gains) Losses on Cash Flow Hedges
Foreign Exchange Contracts	Other Operating Income/Expense		(3.7	)		(3.3	)
Pension and Other Postretirement Benefit Adjustments
Amortization of Net Actuarial (Gain) Loss	Employee Benefits		(0.3	)		(1.1	)
Amortization of Prior Service Cost	Employee Benefits		6.8			20.1
Gross Reclassification Adjustment		$	6.5		$	19.0

61

Notes to Consolidated Financial Statements (continued)

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

	Three Months Ended September 30,				Nine Months Ended September 30,
($ In Millions Except Per Common Share Information)	2014		2013		2014		2013
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding		235,701,076		239,930,074		236,301,789		239,614,868
Net Income	$	204.5	$	206.5	$	567.8	$	561.6
Less: Dividends on Preferred Stock		—		—		—		—
Net Income Applicable to Common Stock		204.5		206.5		567.8		561.6
Less: Earnings Allocated to Participating Securities		3.5		3.5		9.5		9.1
Earnings Allocated to Common Shares Outstanding		201.0		203.0		558.3		552.5
Basic Net Income Per Common Share	$	0.85	$	0.85	$	2.36	$	2.31
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding		235,701,076		239,930,074		236,301,789		239,614,868
Plus: Dilutive Effect of Share-based Compensation		2,036,053		1,400,578		1,873,907		1,242,829
Average Common and Potential Common Shares		237,737,129		241,330,652		238,175,696		240,857,697
Earnings Allocated to Common and Potential
Common Shares	$	201.0	$	203.0	$	558.4	$	552.5
Diluted Net Income Per Common Share		0.84		0.84		2.34		2.29

Note: Common stock equivalents totaling 1,071,654 and 1,671,849 for the three and nine months ended September 30, 2014, respectively, and 3,371,680 and 3,783,018 for the three and nine months ended September 30, 2013, respectively, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive.

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

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014		2013
Interest Income
Loans and Leases	$	184.8	$	185.4	$	553.5	$	558.5
Securities — Taxable		65.1		60.9		198.0		167.6
— Non-Taxable		1.6		2.7		5.7		9.0
Interest-Bearing Deposits with Banks		30.9		36.3		96.6		105.8
Federal Reserve Deposits and Other		11.4		5.8		29.2		12.2
Total Interest Income		293.8		291.1		883.0		853.1
Interest Expense
Deposits		21.6		25.8		64.1		79.9
Federal Funds Purchased		0.5		0.4		1.1		1.0
Securities Sold Under Agreements to Repurchase		0.1		0.1		0.3		0.3
Other Borrowings		0.9		0.8		2.4		2.5
Senior Notes		11.6		18.4		42.8		56.9
Long-Term Debt		9.2		8.0		29.0		27.5
Floating Rate Capital Debt		0.6		0.6		1.7		1.8
Total Interest Expense		44.5		54.1		141.4		169.9
Net Interest Income	$	249.3	$	237.0	$	741.6	$	683.2

62

Notes to Consolidated Financial Statements (continued)

14. Income Taxes – Income tax expense for the three and nine months ended September 30, 2014, of $99.7 million and $276.6 million, respectively, was recorded, each representing an effective tax rate of 32.8%. The prior year three and nine month provisions for income taxes were $95.0 million and $268.2 million, representing effective tax rates of 31.5% and 32.3%, respectively.

15. Pension and Other Postretirement Plans — 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 other postretirement plan for the three and nine months ended September 30, 2014, and 2013.

Net Periodic Pension Expense U.S. Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2014			2013			2014			2013
Service Cost	$	8.2		$	7.5		$	24.6		$	22.7
Interest Cost		11.1			10.5			33.3			31.6
Expected Return on Plan Assets		(24.4	)		(23.1	)		(73.3	)		(69.2	)
Amortization
Net Actuarial Loss		(0.1	)		10.3			(0.3	)		30.9
Prior Service Cost		5.4			(0.1	)		16.1			(0.3	)
Net Periodic Pension Expense	$	0.2		$	5.1		$	0.4		$	15.7

Net Periodic Pension Expense (Benefit) Non U.S. Plans	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2014			2013			2014			2013
Interest Cost	$	1.8		$	1.6		$	5.3		$	4.9
Expected Return on Plan Assets		(1.8	)		(1.5	)		(5.3	)		(4.6	)
Net Actuarial Loss Amortization		(0.4	)		0.2			(1.2	)		0.7
Net Periodic Pension Expense (Benefit)	$	(0.4	)	$	0.3		$	(1.2	)	$	1.0

Net Periodic Pension Expense Supplemental Plan	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014		2013
Service Cost	$	0.8	$	0.4	$	2.3	$	1.2
Interest Cost		1.2		1.1		3.6		3.3
Amortization
Net Actuarial Loss		0.2		1.7		0.4		5.1
Prior Service Cost		1.5		0.2		4.4		0.4
Net Periodic Pension Expense	$	3.7	$	3.4	$	10.7	$	10.0

Net Periodic Postretirement Expense (Benefit) Other Postretirement Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2014			2013			2014			2013
Service Cost	$	—		$	—		$	0.1		$	0.1
Interest Cost		0.4			0.3			1.1			0.9
Amortization
Net Actuarial Gain		—			(0.3	)		—			(0.9	)
Prior Service Cost		(0.1	)		(0.7	)		(0.4	)		(2.2	)
Net Periodic Postretirement Expense (Benefit)	$	0.3		$	(0.7	)	$	0.8		$	(2.1	)

63

Notes to Consolidated Financial Statements (continued)

16. 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 nine months ended September 30, 2014, and 2013.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014		2013
Restricted Stock Unit Awards	$	12.7	$	12.1	$	41.7	$	36.4
Stock Options		2.2		3.7		10.7		14.9
Performance Stock Units		3.1		2.1		8.9		5.4
Total Share-Based Compensation Expense		18.0		17.9		61.3		56.7
Tax Benefits Recognized	$	6.8	$	6.8	$	23.0	$	21.3

17. 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 September 30, 2014, and December 31, 2013, the carrying amounts of these investments, which are included in loans and leases in the consolidated balance sheet, were $579.1 million and $671.2 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. These 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 investments and their ability to operate in compliance with the rules and regulations necessary for the qualification of tax credits generated by equity investments. Northern Trust has determined that it is not the primary beneficiary of any community development project as it lacks the power to

64

Notes to Consolidated Financial Statements (continued)

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 unfunded commitments. As of September 30, 2014, and December 31, 2013, the carrying amount of investments in community development projects that generate tax credits, included in other assets in the consolidated balance sheet, totaled $224.1 million and $222.3 million, respectively. As of September 30, 2014, and December 31, 2013, liabilities related to unfunded commitments on investments in tax credit community development projects, included in other liabilities in the consolidated balance sheet, totaled $27.4 million and $19.8 million, respectively. Northern Trust’s funding requirements are limited to its invested capital and unfunded 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 $14.5 million and $43.2 million for the three and nine months ended September 30, 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 on its consolidated balance sheet 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, the Corporation earns a competitively priced fee that is based on assets managed and varies with each fund’s investment objective. Based on its analysis, Northern Trust has determined that it is not the primary beneficiary of these VIEs under GAAP.

18. Contingent Liabilities — Standby Letters of Credit and Indemnifications. 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 $4.3 billion at September 30, 2014, and $4.5 billion at December 31, 2013.

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 Senior Credit Committee. In connection with these activities, Northern Trust has issued indemnifications to certain clients against certain losses that are a direct result of a borrower’s failure to return securities when due, should the value of such securities exceed the value of the collateral required to be posted. Borrowers are required to collateralize fully securities received with cash or marketable securities. As securities are loaned, collateral is maintained at a minimum of 100% of the fair value of the securities plus accrued interest. The collateral is revalued on a daily

65

Notes to Consolidated Financial Statements (continued)

basis. The amount of securities loaned subject to indemnification was $99.9 billion at September 30, 2014, and $82.7 billion at December 31, 2013. 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 at September 30, 2014, or December 31, 2013, 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”. Thus, references to the upper end of the range of reasonably possible loss for matters in which the Corporation is able to estimate a range of reasonably possible loss mean the upper end of the range of loss for matters for which the Corporation believes the risk of loss is more than remote but less than likely.

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 September 30, 2014, the Corporation has estimated the upper end of the range of reasonably possible losses for these matters to be approximately $130 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.

66

Notes to Consolidated Financial Statements (continued)

As previously disclosed, a number of participants in our securities lending program, which is associated with the Corporation’s asset servicing business, have commenced either individual lawsuits or purported class actions in which they claim, among other things, that we 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 the fourth quarter of 2013, Northern Trust recorded a $19.2 million pre-tax charge in connection with an agreement to resolve claims related to two of these lawsuits. The settlement is not final as it requires further documentation, signed agreements and court approval. Other lawsuits related to securities lending are not part of the proposed settlement, and remain pending.

In April 2014 Northern Trust received a subpoena from the U.S. Securities and Exchange Commission (SEC) seeking documents related to Northern Trust’s securities lending activities. Northern Trust is cooperating with the SEC in this investigation.

Visa Membership. Northern Trust, as a member of Visa U.S.A. Inc. and in connection with the 2007 initial public offering of Visa Inc. (Visa), received shares of restricted stock in Visa. As of September 30, 2014, the Visa shares held by Northern Trust are recorded at their original cost basis of zero and have restrictions as to their sale or transfer.

Northern Trust is obligated to indemnify Visa for losses resulting from certain indemnified litigation relating to interchange fees and has been required to recognize, at its estimated fair value in accordance with GAAP, a guarantee liability arising from such litigation that has not yet settled. During 2007, Northern Trust recorded liabilities relating to Visa indemnified litigation. Subsequently, Visa established an escrow account to cover the settlements of, or judgments in, indemnified litigation. The fundings by Visa of its escrow account resulted in reductions of Northern Trust’s indemnification liability. Northern Trust’s indemnification liability was fully eliminated as of December 31, 2011. On October 19, 2012, Visa signed a settlement agreement with plaintiff representatives for binding settlement of the indemnified 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.

While the ultimate resolution of the indemnified litigation and the timing for removal of selling restrictions on the Visa shares are highly uncertain, Northern Trust anticipates that the value of its Visa shares will be adequate to offset any remaining indemnification obligations related to Visa litigation.

Contingent Purchase Consideration. In connection with an acquisition consummated in 2011, contingent consideration was recorded relating to certain performance-related purchase price adjustments. The fair value of the contingent consideration was $55.4 million at December 31, 2013. In April 2014 Northern Trust made a payment of $55.3 million to extinguish the contingent consideration liability at the value agreed by the parties.

19. 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 credit default swap contracts.

67

Notes to Consolidated Financial Statements (continued)

Northern Trust’s primary risks associated with these instruments is the possibility that interest rates, foreign exchange rates, or credit spreads 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 or deposited. The amount of credit risk will increase or decrease during the lives of the instruments as interest rates, foreign exchange rates, or credit spreads 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 sheet 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 statement 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 sheet were each reduced by $2.2 billion as of September 30, 2014, and by $1.2 billion as of December 31, 2013, as a result of master netting arrangements and similar agreements in place. Derivative assets and liabilities recorded at September 30, 2014, also reflect reductions of $207.4 million and $601.3 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 $210.7 million and $767.7 million, respectively, at December 31, 2013. Additional cash collateral received from and deposited with derivative counterparties totaling $42.0 million and $51.3 million, respectively, as of September 30, 2014, and $36.4 million and $39.3 million, respectively, as of December 31, 2013, were not offset against derivative assets and liabilities on the consolidated balance sheet as the amounts exceeded the net derivative positions with those counterparties. Northern Trust centrally clears interest rate derivative instruments that are addressed under Title VII of the Dodd-Frank Wall Street Reform and Consumer Protection Act. Securities posted as collateral for these transactions totaled $27.5 million and $27.6 million at September 30, 2014, and December 31, 2013, respectively, are not offset against derivative assets and liabilities on the consolidated balance sheet, 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 $113.4 million and $257.3 million at September 30, 2014, and December 31, 2013, respectively. Cash collateral amounts deposited with derivative counterparties on those dates included $41.5 million and $197.0 million, respectively, posted against these liabilities, resulting in a net maximum amount of termination payments that could have been required at September 30, 2014, and December 31, 2013 of $71.9 million and $60.3 million, respectively. Accelerated settlement of these liabilities would not have a material effect on the consolidated financial position or liquidity of Northern Trust.

68

Notes to Consolidated Financial Statements (continued)

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 on behalf of its clients and also may utilize such contracts to reduce or eliminate the exposure to changes in the cash flows or fair value of hedged assets or liabilities due to changes in interest rates. Interest rate option contracts may include caps, floors, collars, and swaptions, and provide for the transfer or reduction of interest rate risk, typically in exchange for a fee. Northern Trust enters into option contracts primarily as a seller of interest rate protection to clients. Northern Trust receives a fee at the outset of the agreement for the assumption of the risk of an unfavorable change in interest rates.

This assumed interest rate risk is then mitigated by entering into an offsetting position with an outside counterparty. Northern Trust may also purchase or enter into option contracts for risk management purposes including to reduce the exposure to changes in the cash flows of hedged assets due to changes in interest rates.

Credit default swap contracts are agreements to transfer credit default risk from one party to another in exchange for a fee. Northern Trust enters into credit default swaps with outside counterparties where the counterparty agrees to assume the underlying credit exposure of a specific Northern Trust commercial loan or loan commitment.

Client-Related and Trading Derivative Instruments. Approximately 97% of Northern Trust’s derivatives outstanding at September 30, 2014, and December 31, 2013, 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 sheet. 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.

	September 30, 2014						December 31, 2013
	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	270,022.4	$	4,132.8	$	4,125.5	$	243,135.0	$	2,844.7	$	2,846.2
Interest Rate Contracts		5,048.9		100.2		95.9		5,001.7		122.8		117.0
Total	$	275,071.3	$	4,233.0	$	4,221.4	$	248,136.7	$	2,967.5	$	2,963.2

69

Notes to Consolidated Financial Statements (continued)

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 statement of income for the three and nine months ended September 30, 2014, and 2013.

	Location of Derivative Gain/(Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
		Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)		2014		2013		2014		2013
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	46.4	$	62.8	$	149.4	$	193.6
Interest Rate Contracts	Security Commissions and Trading Income		0.6		4.4		4.6		11.4
Total		$	47.0	$	67.2	$	154.0	$	205.0

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

			September 30, 2014						December 31, 2013
(In Millions)	Derivative Instrument	Risk Classification	Notional Value		Fair Value				Notional Value		Fair Value
					Asset		Liability				Asset		Liability
Fair Value Hedges
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate	$	2,939.7	$	20.8	$	24.9	$	3,296.9	$	31.5	$	44.8
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Rate		1,250.0		92.4		2.0		1,250.0		83.6		33.4
Cash Flow Hedges
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		341.0		5.2		9.5		314.0		10.2		5.5
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate		10.0		—		—		—		—		—
Available for Sale Investment Securities	Interest Rate Option Contracts	Interest Rate		375.0		0.1		0.7		—		—		—
Net Investment Hedges
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		1,753.6		65.5		3.1		1,684.9		9.8		52.8
Total			$	6,669.3	$	184.0	$	40.2	$	6,545.8	$	135.1	$	136.5

70

Notes to Consolidated Financial Statements (continued)

In addition to the above, Sterling denominated debt, totaling $250.4 million and $259.1 million at September 30, 2014, and December 31, 2013, respectively, was designated as a hedge of the foreign exchange risk associated with the net investment in certain non-U.S. affiliates.

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 statement of income related to fair value hedges for the three and nine months ended September 30, 2014, and 2013.

(In Millions)	Derivative Instrument	Location of Derivative Gain/(Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
			Three Months Ended September 30,					Nine Months Ended September 30,
			2014		2013			2014			2013
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Income	$	5.1	$	(16.4	)	$	(21.9	)	$	21.6
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Expense		5.8		(3.6	)		66.0			(16.1	)
Total			$	10.9	$	(20.0	)	$	44.1		$	5.5

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 as the gain or loss. For fair value hedges that do not qualify for the “shortcut” method of accounting, Northern Trust utilizes regression analysis, a “long-haul” method of accounting, in assessing whether the hedging relationships are highly effective at inception and on an ongoing basis. There was no ineffectiveness or changes in the fair value of hedged items recognized in earnings for fair value hedges during the three and nine months ended September 30, 2014. There were losses of $0.3 million and $0.9 million recorded within the fair values of hedged items for such “long-haul” hedges during the three and nine months ended September 30, 2013, respectively. There were losses of $0.3 million and $0.8 million from ineffectiveness recorded during the three and nine months ended September 30, 2013, respectively, in connection with the hedging of available for sale investment securities, senior notes, and subordinated debt. Ineffectiveness resulting from fair value hedges is recorded in either interest income or interest expense.

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. When the hedged forecasted transaction impacts earnings, balances in AOCI are reclassified to 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 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.

71

Notes to Consolidated Financial Statements (continued)

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 nine months ended September 30, 2014, and 2013. As of September 30, 2014, 23 months is the maximum length of time over which the exposure to variability in future cash flows of forecasted foreign currency denominated transactions is 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 nine months ended September 30, 2014, and 2013.

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)				Interest Rate Option Contracts (Before Tax)
Three Months Ended September 30,	2014			2013			2014		2013		2014			2013
Net Gain/(Loss) Recognized in AOCI	$	(6.9	)	$	5.3		$	—	$	—	$	(0.7	)	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Other Operating Income		0.7			—			—		—		—			—
Interest Income		—			—			—		—		0.1			—
Other Operating Expense		—			(1.1	)		—		—		—			—
Total	$	0.7		$	(1.1	)	$	—	$	—	$	0.1		$	—

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)				Interest Rate Option Contracts (Before Tax)
Nine Months Ended September 30,	2014			2013			2014		2013		2014			2013
Net Gain/(Loss) Recognized in AOCI	$	(5.8	)	$	(4.0	)	$	—	$	—	$	(0.7	)	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Other Operating Income		3.4			(1.8	)		—		—		—			—
Interest Income		—			—			—		—		0.1			—
Other Operating Expense		(0.2	)		(3.9	)		—		—		—			—
Total	$	3.2		$	(5.7	)	$	—	$	—	$	0.1		$	—

During the three and nine months ended September 30, 2014, and 2013, 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 $1.8 million will be reclassified into earnings within the next twelve months relating to cash flow hedges of foreign currency denominated transactions. It is estimated that a net gain of $2.2 million will be reclassified into earnings 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 nine months ended September 30, 2014, and 2013. Amounts recorded in AOCI are reclassified to earnings only upon the sale or liquidation of an investment in a non-U.S. branch or subsidiary.

72

Notes to Consolidated Financial Statements (continued)

The following table provides net investment hedge gains and losses recognized in AOCI during the three and nine months ended September 30, 2014, and 2013.

	Hedging Gain/(Loss) Recognized in OCI (Before Tax)
	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	2014		2013			2014		2013
Foreign Exchange Contracts	$	106.2	$	(73.8	)	$	74.3	$	(9.5	)
Sterling Denominated Subordinated Debt		13.7		(15.0	)		5.4		0.2
Total	$	119.9	$	(88.8	)	$	79.7	$	(9.3	)

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. Credit default swaps are entered into to manage the credit risk associated with certain loans and loan commitments. The following table identifies the types of risk management derivative instruments not formally designated as hedges and their notional amounts and fair values.

(In Millions)	September 30, 2014						December 31, 2013
	Notional Value		Fair Value				Notional Value		Fair Value
			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	192.3	$	0.3	$	3.5	$	168.8	$	1.0	$	1.2

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 statement of income for the three and nine months ended September 30, 2014, and 2013.

(In Millions)	Location of Derivative Gain/ (Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
		Three Months Ended September 30,					Nine Months Ended September 30,
		2014			2013		2014			2013
Credit Default Swap Contracts	Other Operating Income	$	—		$	—	$	—		$	(0.1	)
Foreign Exchange Contracts	Other Operating Income		(10.1	)		6.7		(9.3	)		(4.3	)
Total		$	(10.1	)	$	6.7	$	(9.3	)	$	(4.4	)

73

Notes to Consolidated Financial Statements (continued)

20. 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 sheet as of September 30, 2014, and December 31, 2013.

September 30, 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 Over the Counter (OTC)	$	3,265.0	$	2,085.0	$	1,180.0	$	—	$	1,180.0
Interest Rate Swaps OTC		183.7		31.5		152.2		—		152.2
Interest Rate Swaps Exchange Cleared		29.8		7.4		22.4		—		22.4
Cross Product Netting Adjustment		—		27.1		—		—		—
Cross Product Collateral Adjustment		—		207.4		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,478.5		2,358.4		1,120.1		—		1,120.1
Total Derivatives Not Subject to a Master Netting Arrangement		938.8		—		938.8		—		938.8
Total Derivatives		4,417.3		2,358.4		2,058.9		—		2,058.9
Securities Purchased under Agreements to Resell (2)	$	1,000.0	$	—	$	1,000.0	$	1,000.0	$	—

December 31, 2013
(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	$	2,612.5	$	1,073.3	$	1,539.2	$	—	$	1,539.2
Interest Rate Swaps OTC		228.8		47.5		181.3		—		181.3
Interest Rate Swaps Exchange Cleared		9.1		9.1		—		—		—
Cross Product Netting Adjustment		—		28.4		—		—		—
Cross Product Collateral Adjustment		—		210.7		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		2,850.4		1,369.0		1,481.4		—		1,481.4
Total Derivatives Not Subject to a Master Netting Arrangement		253.2		—		253.2		—		253.2
Total Derivatives		3,103.6		1,369.0		1,734.6		—		1,734.6
Securities Purchased under Agreements to Resell (2)	$	500.0	$	—	$	500.0	$	500.0	$	—

(1) Derivative assets are reported in other assets in the consolidated balance sheet. Other assets (excluding derivative assets) totaled $3,230.9 million and $3,029.4 million as of September 30, 2014, and December 31, 2013, 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 sheet. Federal funds sold totaled $10.0 million and $29.6 million as of September 30, 2014, and December 31, 2013, respectively.

(3) Northern Trust did not possess any cash collateral that was not offset in the consolidated balance sheet that could have been used to offset the net amounts presented in the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

74

Notes to Consolidated Financial Statements (continued)

The following tables provide information regarding the offsetting of derivative liabilities and securities sold under agreements to repurchase within the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

September 30, 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	$	3,404.3	$	2,085.0	$	1,319.3	$	—	$	1,319.3
Interest Rate Swaps OTC		116.1		31.5		84.6		—		84.6
Interest Rate Swaps Exchange Cleared		7.4		7.4		—		—		—
Cross Product Netting Adjustment		—		27.1		—		—		—
Cross Product Collateral Adjustment		—		601.3		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,527.8		2,752.3		775.5		—		775.5
Total Derivatives Not Subject to a Master Netting Arrangement		737.3		—		737.3		—		737.3
Total Derivatives		4,265.1		2,752.3		1,512.8		—		1,512.8
Securities Sold under Agreements to Repurchase	$	866.8	$	—	$	866.8	$	866.8	$	—

December 31, 2013
(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	$	2,039.0	$	1,073.3	$	965.7	$	—	$	965.7
Interest Rate Swaps OTC		163.7		47.5		116.2		—		116.2
Interest Rate Swaps Exchange Cleared		31.5		9.1		22.4		—		22.4
Cross Product Netting Adjustment		—		28.4		—		—		—
Cross Product Collateral Adjustment		—		767.7		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		2,234.2		1,926.0		308.2		—		308.2
Total Derivatives Not Subject to a Master Netting Arrangement		866.7		—		866.7				866.7
Total Derivatives		3,100.9		1,926.0		1,174.9		—		1,174.9
Securities Sold under Agreements to Repurchase	$	917.3	$	—	$	917.3	$	917.3	$	—

(1) Derivative liabilities are reported in other liabilities in the consolidated balance sheet. Other liabilities (excluding derivative liabilities) totaled $2,591.5 million and $2,338.4 million as of September 30, 2014, and December 31, 2013, respectively.

(2) Northern Trust did not place any cash collateral with counterparties that was not offset in the consolidated balance sheet that could have been used to offset the net amounts presented in the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

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

75

Notes to Consolidated Financial Statements (continued)

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 Act. These transactions are subject to an agreement similar to a master netting arrangement which has the same rights of offset as described above.

76

Item 4. Controls and Procedures

The Corporation’s management, with the participation of the Corporation’s Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of Northern Trust’s “disclosure controls and procedures” (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the Exchange Act)) as of September 30, 2014. Based on such evaluation, such officers have concluded that, as of September 30, 2014, the Corporation’s disclosure controls and procedures are effective in bringing to their attention on a timely basis information required to be disclosed by the Corporation in the reports it files or submits under the Exchange Act.

During the quarter ended September 30, 2014, there have been no changes in the Corporation’s internal control over financial reporting 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 in Note 18 titled “Contingent Liabilities” within 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 September 30, 2014.

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
July 1-31, 2014		159,053	$	66.42		159,053		10,605,530
August 1-31, 2014		527,705		66.87		527,705		10,077,825
September 1-30, 2014		454,591		69.25		454,591		9,623,234
Total (Third Quarter)		1,141,349	$	67.76		1,141,349		9,623,234

(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.

77

(2) Includes shares repurchased under the authorization approved by the Corporation’s board of directors on April 15, 2014. Under this program, which has no expiration date, the Corporation may repurchase up to 12.0 million shares of the Corporation’s common stock.

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.

78

SIGNATURES

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

	NORTHERN TRUST CORPORATION
	(Registrant)
Date: October 31, 2014	By:	/s/    S. Biff Bowman
		S. Biff Bowman Executive Vice President and Chief Financial Officer
Date: October 31, 2014	By:	/s/    Jane Karpinski
		Jane Karpinski Senior Vice President and Controller (Principal Accounting Officer)

79

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 for the quarter ended September 30, 2014, formatted in Extensible Business Reporting Language (XBRL): (1) the Consolidated Balance Sheet (2) the Consolidated Statement of Income, (3) the Consolidated Statement of Comprehensive Income (4) the Consolidated Statement of Changes in Stockholders’ Equity, (5) the Consolidated Statement of Cash Flows, and (6) Notes to Consolidated Financial Statements.

80

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 ending September 30, 2014 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(s) 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(s) 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: October 31, 2014	Frederick H. Waddell
	Chief 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 ending September 30, 2014 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(s) 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(s) 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: October 31, 2014	S. Biff Bowman
	Chief 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 ending September 30, 2014 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

Date: October 31, 2014

    /s/  S. Biff Bowman

     S. Biff Bowman

     Chief Financial Officer

Date: October 31, 2014

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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Share-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2014

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 nine months ended September 30, 2014, and 2013.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014		2013
Restricted Stock Unit Awards	$	12.7	$	12.1	$	41.7	$	36.4
Stock Options		2.2		3.7		10.7		14.9
Performance Stock Units		3.1		2.1		8.9		5.4
Total Share-Based Compensation Expense		18.0		17.9		61.3		56.7
Tax Benefits Recognized	$	6.8	$	6.8	$	23.0	$	21.3

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Securities - Additional Information (Detail) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014 Investment		Sep. 30, 2013		Sep. 30, 2014 Investment		Sep. 30, 2013		Dec. 31, 2013
Schedule of Trading Securities and Other Trading Assets [Line Items]
Investment Security Gains (Losses), net	$ 300,000	[1]	$ (2,200,000)	[1]	$ (3,300,000)	[1]	$ (1,900,000)	[1]
Gross proceeds from sale of securities	337,300,000		316,400,000		801,200,000		398,100,000
Gross realized securities gains	1,000,000		100,000		1,700,000		400,000
Gross realized securities losses	700,000		2,300,000		1,100,000		2,300,000
Number of securities in an unrealized loss position	471				471
Total Fair Value	9,852,500,000				9,852,500,000				10,250,000,000
Total Unrealized Losses	82,500,000				82,500,000				180,400,000
Net impairment losses recognized in earnings	0		0		3,900,000		0
U.S. Government Sponsored Agency
Schedule of Trading Securities and Other Trading Assets [Line Items]
Total Unrealized Losses	25,200,000				25,200,000
Others | Community Reinvestment Act CRA
Schedule of Trading Securities and Other Trading Assets [Line Items]
Total Unrealized Losses	16,300,000				16,300,000
Auction Rate Securities
Schedule of Trading Securities and Other Trading Assets [Line Items]
Total Unrealized Losses	500,000				500,000
Corporate Debt
Schedule of Trading Securities and Other Trading Assets [Line Items]
Total Unrealized Losses	33,400,000				33,400,000
Percent of corporate debt portfolio	40.00%				40.00%
Non-Agency RMBS | Financing Receivable, Current | Lower Limit
Schedule of Trading Securities and Other Trading Assets [Line Items]
Expected loss on subprime, Alt-A, prime and 2nd lien portfolios developed using default roll rate	5.00%				5.00%
Non-Agency RMBS | Financing Receivable, Current | Upper Limit
Schedule of Trading Securities and Other Trading Assets [Line Items]
Expected loss on subprime, Alt-A, prime and 2nd lien portfolios developed using default roll rate	30.00%				30.00%
Non-Agency RMBS | Financing Receivable, 30 to 59 Days Past Due
Schedule of Trading Securities and Other Trading Assets [Line Items]
Expected loss on subprime, Alt-A, prime and 2nd lien portfolios developed using default roll rate	30.00%				30.00%
Non-Agency RMBS | Financing Receivable, 60 to 89 Days Past Due
Schedule of Trading Securities and Other Trading Assets [Line Items]
Expected loss on subprime, Alt-A, prime and 2nd lien portfolios developed using default roll rate	80.00%				80.00%
Non-Agency RMBS | Financing Receivable, 90 Days and Greater Past Due
Schedule of Trading Securities and Other Trading Assets [Line Items]
Expected loss on subprime, Alt-A, prime and 2nd lien portfolios developed using default roll rate	90.00%				90.00%
Non-Agency RMBS | Other Real Estate Owned and Loans in Foreclosure
Schedule of Trading Securities and Other Trading Assets [Line Items]
Expected loss on subprime, Alt-A, prime and 2nd lien portfolios developed using default roll rate	100.00%				100.00%
Residential Mortgage-Backed
Schedule of Trading Securities and Other Trading Assets [Line Items]
Total Unrealized Losses	$ 1,300,000				$ 1,300,000
Number of securities in an unrealized loss position for more than 12 months	2				2
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	100.00%				100.00%
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 0.3 (2.2 ) 0.6 (1.9 ) Investment Security Gains (Losses), net $ 0.3 $ (2.2 ) $ (3.3 ) $ (1.9 )

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Changes in Level 3 Liabilities (Detail) (Contingent Consideration, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Liabilities Beginning Balance	$ 52.7		$ 55.4		$ 50.1
Total (Gains) and Losses:
Included in Earnings	1.3	[1]	(0.1)	[1]	3.9	[1]
Purchases, Issues, Sales, and Settlements
Settlements			(55.3)
Fair Value Liabilities Ending Balance	54.0				54.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at June 30	$ 1.3	[1]			$ 3.9	[1]

[1] (Gains) losses are recorded in other operating income (expense) within the consolidated statement of income.

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Goodwill and Other Intangibles - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Line Items]
Estimated future amortization expense for 2014	$ 4.8		$ 4.8
Estimated future amortization expense for 2015	11.5		11.5
Estimated future amortization expense for 2016	9.0		9.0
Estimated future amortization expense for 2017	8.9		8.9
Estimated future amortization expense for 2018	8.2		8.2
Other Intangible Assets
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense related to other intangible assets	$ 4.8	$ 5.2	$ 14.7	$ 15.5

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Securities Continuous Unrealized Loss Position (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	$ 6,359.4	$ 9,473.9
Less than 12 Months Unrealized Losses	22.3	145.8
12 Months or Longer Fair Value	3,493.1	776.1
12 Months or Longer Unrealized Losses	60.2	34.6
Total Fair Value	9,852.5	10,250.0
Total Unrealized Losses	82.5	180.4
U.S. Government
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	1,596.0	896.4
Less than 12 Months Unrealized Losses	1.5	1.4
Total Fair Value	1,596.0	896.4
Total Unrealized Losses	1.5	1.4
U.S. Government Sponsored Agency
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	2,099.2	4,340.8
Less than 12 Months Unrealized Losses	8.3	42.6
12 Months or Longer Fair Value	1,773.5	413.7
12 Months or Longer Unrealized Losses	16.9	5.3
Total Fair Value	3,872.7	4,754.5
Total Unrealized Losses	25.2	47.9
Non-U.S. Government
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	235.4	176.7
Less than 12 Months Unrealized Losses	0.1	1.1
12 Months or Longer Fair Value	80.3
12 Months or Longer Unrealized Losses	0.6
Total Fair Value	315.7	176.7
Total Unrealized Losses	0.7	1.1
Corporate Debt
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	862.3	1,759.5
Less than 12 Months Unrealized Losses	2.8	85.4
12 Months or Longer Fair Value	1,258.0	267.0
12 Months or Longer Unrealized Losses	30.6	15.8
Total Fair Value	2,120.3	2,026.5
Total Unrealized Losses	33.4	101.2
Covered Bonds
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	77.0	278.8
Less than 12 Months Unrealized Losses	0.1	5.7
12 Months or Longer Fair Value	9.9	9.9
12 Months or Longer Unrealized Losses	0.1	0.2
Total Fair Value	86.9	288.7
Total Unrealized Losses	0.2	5.9
Supranational and Non-U.S. Agency Bonds
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	438.2	612.7
Less than 12 Months Unrealized Losses	0.7	4.9
12 Months or Longer Fair Value	300.8
12 Months or Longer Unrealized Losses	2.4
Total Fair Value	739.0	612.7
Total Unrealized Losses	3.1	4.9
Residential Mortgage-Backed
Investments, Unrealized Loss Position [Line Items]
12 Months or Longer Fair Value	15.0	42.0
12 Months or Longer Unrealized Losses	1.3	4.4
Total Fair Value	15.0	42.0
Total Unrealized Losses	1.3	4.4
Other Asset-Backed
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	485.2	677.0
Less than 12 Months Unrealized Losses	0.1	0.4
12 Months or Longer Fair Value	7.1
12 Months or Longer Unrealized Losses	0.1
Total Fair Value	492.3	677.0
Total Unrealized Losses	0.2	0.4
Certificates of Deposit
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	552.0	684.2
Less than 12 Months Unrealized Losses	0.1	0.2
Total Fair Value	552.0	684.2
Total Unrealized Losses	0.1	0.2
Auction Rate Securities
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	1.1	22.1
Less than 12 Months Unrealized Losses	0.1	0.1
12 Months or Longer Fair Value	5.1	14.0
12 Months or Longer Unrealized Losses	0.4	0.7
Total Fair Value	6.2	36.1
Total Unrealized Losses	0.5	0.8
Others
Investments, Unrealized Loss Position [Line Items]
Less than 12 Months Fair Value	13.0	25.7
Less than 12 Months Unrealized Losses	8.5	4.0
12 Months or Longer Fair Value	43.4	29.5
12 Months or Longer Unrealized Losses	7.8	8.2
Total Fair Value	56.4	55.2
Total Unrealized Losses	$ 16.3	$ 12.2

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Net Income Per Common Share Computations - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock equivalents not included in the computation of diluted earnings per share because their inclusion would have been antidilutive	1,071,654	3,371,680	1,671,849	3,783,018

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Changes in Level 3 Assets (Detail) (Auction Rate Securities, USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Assets Beginning Balance	$ 98.8		$ 99.1		$ 98.9		$ 97.8
Total Gains (Losses):
Included in Earnings	0.7				0.7	[1]	0.1	[1]
Included in Other Comprehensive Income	0.1	[2]	0.3	[2]	0.4	[2]	3.0	[2]
Purchases, Issuances, Sales, and Settlements:
Sales	(14.4)				(14.4)
Settlements					(0.4)		(2.2)
Fair Value Assets Ending Balance	$ 85.2		$ 98.7		$ 85.2		$ 98.7

[1] Realized gains for the three and nine months ended September 30, 2014, of $0.7 million, represent gains from sales of securities. Realized gains for the nine month period ended September 30, 2013, of $0.1 million, represent gains from redemptions by issuers. Gains on sales are recorded in investment security gains (losses) and gains on redemptions are recorded in interest income, within the consolidated statement of income.

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

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Goodwill and Other Intangibles (Tables)

9 Months Ended

Sep. 30, 2014

Carrying Amounts of Goodwill

The carrying amounts of goodwill, reflecting the effect of foreign exchange rates on non-U.S. dollar denominated balances, by business unit at September 30, 2014, and December 31, 2013, were as follows:

(In Millions)	September 30, 2014		December 31, 2013
Corporate & Institutional Services	$	466.6	$	469.2
Wealth Management		71.5		71.5
Total Goodwill	$	538.1	$	540.7

Other Intangible Assets Subject to Amortization

The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of September 30, 2014, and December 31, 2013, were as follows:

(In Millions)	September 30, 2014		December 31, 2013
Gross Carrying Amount	$	193.4	$	198.2
Less: Accumulated Amortization		127.6		115.2
Net Book Value	$	65.8	$	83.0

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Components of Net Interest Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest Income
Loans and Leases	$ 184.8	$ 185.4	$ 553.5	$ 558.5
Securities - Taxable	65.1	60.9	198.0	167.6
- Non-Taxable	1.6	2.7	5.7	9.0
Interest-Bearing Deposits with Banks	30.9	36.3	96.6	105.8
Federal Reserve Deposits and Other	11.4	5.8	29.2	12.2
Total Interest Income	293.8	291.1	883.0	853.1
Interest Expense
Deposits	21.6	25.8	64.1	79.9
Federal Funds Purchased	0.5	0.4	1.1	1.0
Securities Sold Under Agreements to Repurchase	0.1	0.1	0.3	0.3
Other Borrowings	0.9	0.8	2.4	2.5
Senior Notes	11.6	18.4	42.8	56.9
Long-Term Debt	9.2	8.0	29.0	27.5
Floating Rate Capital Debt	0.6	0.6	1.7	1.8
Total Interest Expense	44.5	54.1	141.4	169.9
Net Interest Income	$ 249.3	$ 237.0	$ 741.6	$ 683.2

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Earnings Contribution of Northern Trust's Business Units (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Fully taxable equivalent basis adjustments	$ 6.9	$ 7.8	$ 22.4	$ 23.3

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Gains and Losses Recorded in Consolidated Statement of Income Related to Fair Value Hedges (Detail) (Asset And Liability Management, FAIR VALUE HEDGES, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ 10.9	$ (20.0)	$ 44.1	$ 5.5
Available for Sale Investment Securities | Interest Rate Swap Contracts | Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	5.1	(16.4)	(21.9)	21.6
Senior Notes and Long- Term Subordinated Debt | Interest Rate Swap Contracts | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ 5.8	$ (3.6)	$ 66.0	$ (16.1)

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Credit Related Impairment Losses Recognized in Earnings on Other Than Temporarily Impaired Securities (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Changes in OTTI Losses			$ (4,600,000)	[1]
Noncredit-related Losses Recorded in / (Reclassified from) OCI			700,000	[2]
Net Impairment Losses Recognized in Earnings	$ 0	$ 0	$ (3,900,000)		$ 0

[1] For initial other-than-temporary impairments in the respective 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 other-than-temporary impairments in the respective period, the balance includes the portion of the excess of amortized cost over the fair value of the impaired securities that was recorded in 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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Reclassification Adjustments out of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
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	$ (0.3)	$ (0.6)
CASH FLOW HEDGES | Foreign Exchange Contracts | Other Operating Income/Expense
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gross Reclassification Adjustment	(3.7)	(3.3)
Pension and Other Postretirement Benefit Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gross Reclassification Adjustment	6.5	19.0
Pension and Other Postretirement Benefit Adjustments | Employee Benefits
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Net Actuarial (Gain) Loss	(0.3)	(1.1)
Amortization of Prior Service Cost	$ 6.8	$ 20.1

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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, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Notional Value	$ 275,071.3	$ 248,136.7
Fair Value Asset	4,233.0	2,967.5
Fair Value Liability	4,221.4	2,963.2
Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	270,022.4	243,135.0
Fair Value Asset	4,132.8	2,844.7
Fair Value Liability	4,125.5	2,846.2
Interest Rate Contracts
Derivative [Line Items]
Notional Value	5,048.9	5,001.7
Fair Value Asset	100.2	122.8
Fair Value Liability	$ 95.9	$ 117.0

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Components of Company's Net Periodic Benefit Cost (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
U.S. Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	$ 8.2	$ 7.5	$ 24.6	$ 22.7
Interest Cost	11.1	10.5	33.3	31.6
Expected Return on Plan Assets	(24.4)	(23.1)	(73.3)	(69.2)
Amortization
Net Actuarial (Gain) Loss	(0.1)	10.3	(0.3)	30.9
Prior Service Cost	5.4	(0.1)	16.1	(0.3)
Net Periodic Pension Expense (Benefit)	0.2	5.1	0.4	15.7
Non U.S. Plans
Defined Benefit plan Net periodic benefit cost
Interest Cost	1.8	1.6	5.3	4.9
Expected Return on Plan Assets	(1.8)	(1.5)	(5.3)	(4.6)
Amortization
Net Actuarial (Gain) Loss	(0.4)	0.2	(1.2)	0.7
Net Periodic Pension Expense (Benefit)	(0.4)	0.3	(1.2)	1.0
Supplemental Plan
Defined Benefit plan Net periodic benefit cost
Service Cost	0.8	0.4	2.3	1.2
Interest Cost	1.2	1.1	3.6	3.3
Amortization
Net Actuarial (Gain) Loss	0.2	1.7	0.4	5.1
Prior Service Cost	1.5	0.2	4.4	0.4
Net Periodic Pension Expense (Benefit)	3.7	3.4	10.7	10.0
Other Postretirement Plan
Defined Benefit plan Net periodic benefit cost
Service Cost			0.1	0.1
Interest Cost	0.4	0.3	1.1	0.9
Amortization
Net Actuarial (Gain) Loss		(0.3)		(0.9)
Prior Service Cost	(0.1)	(0.7)	(0.4)	(2.2)
Net Periodic Pension Expense (Benefit)	$ 0.3	$ (0.7)	$ 0.8	$ (2.1)

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Gains and Losses Recorded in Consolidated Statement of Income Related to Client Related and Trading Derivative Financial Instruments (Detail) (Client Related and Trading, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ 47.0	$ 67.2	$ 154.0	$ 205.0
Foreign Exchange Contracts | Foreign Exchange Trading Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	46.4	62.8	149.4	193.6
Interest Rate Contracts | Security Commissions and Trading Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ 0.6	$ 4.4	$ 4.6	$ 11.4

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Computations of Net Income Per Common Share (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding	235,701,076	239,930,074	236,301,789	239,614,868
Net Income	$ 204.5	$ 206.5	$ 567.8	$ 561.6
Less: Dividends on Preferred Stock
Net Income Applicable to Common Stock	204.5	206.5	567.8	561.6
Less: Earnings Allocated to Participating Securities	3.5	3.5	9.5	9.1
Earnings Allocated to Common Shares Outstanding	201.0	203.0	558.3	552.5
Basic Net Income Per Common Share	$ 0.85	$ 0.85	$ 2.36	$ 2.31
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding	235,701,076	239,930,074	236,301,789	239,614,868
Plus: Dilutive Effect of Share-based Compensation	2,036,053	1,400,578	1,873,907	1,242,829
Average Common and Potential Common Shares	237,737,129	241,330,652	238,175,696	240,857,697
Earnings Allocated to Common and Potential Common Shares	$ 201.0	$ 203.0	$ 558.4	$ 552.5
Diluted Net Income Per Common Share	$ 0.84	$ 0.84	$ 2.34	$ 2.29

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Issuance of Preferred Stock - Additional Information (Detail) (USD $)	9 Months Ended	0 Months Ended	9 Months Ended		0 Months Ended
	Sep. 30, 2014	Aug. 05, 2014 Series C Preferred Stock	Sep. 30, 2014 Series C Preferred Stock	Aug. 05, 2014 Series C Preferred Stock	Oct. 21, 2014 Series C Preferred Stock Subsequent Event
Class of Stock [Line Items]
Preferred stock, shares authorized	10,000,000
Stock issued during period		16,000,000
Per share ownership interest, percentage				0.10%
Preferred stock, without par value
Preferred stock, liquidation preference				$ 25,000
Depository shares, liquidation preference per share				$ 25
Proceeds from preferred stock issued during period	$ 388,500,000	$ 388,500,000
Preferred stock, annual dividend rate			5.85%
Preferred Stock, Dividends Per Share, Declared					$ 593.125
Dividends Payable, Date to be Paid					Jan. 01, 2015
Dividends Payable, Date of Record					Dec. 15, 2014
Preferred Stock, redemption start date			Oct. 01, 2019
Preferred Stock, redemption terms			The Series C Preferred Stock is redeemable at Northern Trust's option, in whole or in part, on any dividend payment date on or after October 1, 2019. The Series C Preferred stock is redeemable at the Company's option, in whole, but not in part, prior to October 1, 2019 within 90 days of a regulatory capital treatment event
Preferred stock redemption period following regulatory capital treatment event			90 days

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Variable Interest Entities

9 Months Ended

Sep. 30, 2014

Variable Interest Entities

17. 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 September 30, 2014, and December 31, 2013, the carrying amounts of these investments, which are included in loans and leases in the consolidated balance sheet, were $579.1 million and $671.2 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. These 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 investments and their ability to operate in compliance with the rules and regulations necessary for the qualification of tax credits generated by equity investments. Northern Trust has determined that it is not the primary beneficiary of any community development project 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 unfunded commitments. As of September 30, 2014, and December 31, 2013, the carrying amount of investments in community development projects that generate tax credits, included in other assets in the consolidated balance sheet, totaled $224.1 million and $222.3 million, respectively. As of September 30, 2014, and December 31, 2013, liabilities related to unfunded commitments on investments in tax credit community development projects, included in other liabilities in the consolidated balance sheet, totaled $27.4 million and $19.8 million, respectively. Northern Trust’s funding requirements are limited to its invested capital and unfunded 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 $14.5 million and $43.2 million for the three and nine months ended September 30, 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 on its consolidated balance sheet 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, the Corporation earns a competitively priced fee that is based on assets managed and varies with each fund’s investment objective. Based on its analysis, Northern Trust has determined that it is not the primary beneficiary of these VIEs under GAAP.

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Book and Fair Values of All Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013		Sep. 30, 2013	Dec. 31, 2012
Assets
Cash and Due from Banks	$ 2,918.9		$ 3,162.4		$ 2,690.7	$ 3,752.7
Federal Funds Sold and Resell Agreements	1,010.0		529.6
Interest-Bearing Deposits with Banks	15,334.5		19,397.4
Federal Reserve Deposits	21,328.0		12,911.5
Securities
Available for Sale	28,107.7		28,392.8
Held to Maturity	4,196.7		2,325.8
Trading Account	4.3		1.7
Loans (excluding Leases)
Client Security Settlement Receivables	1,538.6		1,355.2
Deposits
Savings Certificates and Other Time	1,869.0		1,874.4
Non U.S. Offices Interest-Bearing	50,586.1		48,461.7
Federal Funds Purchased	786.4		965.1
Securities Sold under Agreements to Repurchase	866.8		917.3
Other Borrowings	1,758.3		1,558.6
Senior Notes	1,496.9		1,996.6
Long Term Debt (excluding Leases)
Floating Rate Capital Debt	277.2		277.1
Other Liabilities
Contingent Consideration			55.4
Asset And Liability Management
Derivative Instruments
Assets	184.0		135.1
Liabilities	40.2		136.5
Client Related and Trading
Derivative Instruments
Assets	4,233.0		2,967.5
Liabilities	4,221.4		2,963.2
Carrying (Reported) Amount, Fair Value Disclosure
Assets
Cash and Due from Banks	2,918.9		3,162.4
Federal Funds Sold and Resell Agreements	1,010.0		529.6
Interest-Bearing Deposits with Banks	15,334.5		19,397.4
Federal Reserve Deposits and Other Interest-Bearing			12,911.5
Federal Reserve Deposits	21,328.0
Securities
Available for Sale	28,107.7	[1]	28,392.8	[2]
Held to Maturity	4,196.7		2,325.8
Trading Account	4.3		1.7
Loans (excluding Leases)
Held for Investment	29,499.6		28,136.5
Held for Sale	2.1
Client Security Settlement Receivables	1,538.6		1,355.2
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	207.5		194.7
Community Development Investments	225.1		228.1
Employee Benefit and Deferred Compensation	145.2		132.7
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	39,267.4		33,762.0
Savings Certificates and Other Time	1,869.0		1,874.4
Non U.S. Offices Interest-Bearing	50,586.1		48,461.7
Federal Funds Purchased	786.4		965.1
Securities Sold under Agreements to Repurchase	866.8		917.3
Other Borrowings	1,758.3		1,558.6
Senior Notes	1,496.9		1,996.6
Long Term Debt (excluding Leases)
Subordinated Debt	1,565.5		1,537.3
Federal Home Loan Bank Borrowings			135.0
Floating Rate Capital Debt	277.2		277.1
Other Liabilities
Standby Letters of Credit	57.0		59.6
Contingent Consideration			55.4
Loan Commitments	28.7		35.7
Carrying (Reported) Amount, Fair Value Disclosure | Asset And Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets	71.0		21.0
Liabilities	16.1		59.5
Carrying (Reported) Amount, Fair Value Disclosure | Asset And Liability Management | Interest Rate Contracts
Derivative Instruments
Assets	113.3
Liabilities	27.6
Carrying (Reported) Amount, Fair Value Disclosure | Asset And Liability Management | Interest Rate Swap Contracts
Derivative Instruments
Assets			115.1
Liabilities			78.2
Carrying (Reported) Amount, Fair Value Disclosure | Client Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets	4,132.8		2,844.7
Liabilities	4,125.5		2,846.2
Carrying (Reported) Amount, Fair Value Disclosure | Client Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets	100.2		122.8
Liabilities	95.9		117.0
Estimate of Fair Value, Fair Value Disclosure
Assets
Cash and Due from Banks	2,918.9		3,162.4
Federal Funds Sold and Resell Agreements	1,010.0		529.6
Interest-Bearing Deposits with Banks	15,334.5		19,397.4
Federal Reserve Deposits and Other Interest-Bearing			12,911.5
Federal Reserve Deposits	21,328.0
Securities
Available for Sale	28,107.7	[1]	28,392.8	[2]
Held to Maturity	4,195.1		2,321.4
Trading Account	4.3		1.7
Loans (excluding Leases)
Held for Investment	29,522.7		28,147.2
Held for Sale	2.1
Client Security Settlement Receivables	1,538.6		1,355.2
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	207.5		194.7
Community Development Investments	223.8		227.8
Employee Benefit and Deferred Compensation	147.4		126.9
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	39,267.4		33,762.0
Savings Certificates and Other Time	1,869.5		1,877.1
Non U.S. Offices Interest-Bearing	50,586.1		48,461.7
Federal Funds Purchased	786.4		965.1
Securities Sold under Agreements to Repurchase	866.8		917.3
Other Borrowings	1,758.9		1,558.6
Senior Notes	1,526.8		1,989.3
Long Term Debt (excluding Leases)
Subordinated Debt	1,595.5		1,563.5
Federal Home Loan Bank Borrowings			137.2
Floating Rate Capital Debt	242.8		230.2
Other Liabilities
Standby Letters of Credit	57.0		59.6
Contingent Consideration			55.4
Loan Commitments	28.7		35.7
Estimate of Fair Value, Fair Value Disclosure | Asset And Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets	71.0		21.0
Liabilities	16.1		59.5
Estimate of Fair Value, Fair Value Disclosure | Asset And Liability Management | Interest Rate Contracts
Derivative Instruments
Assets	113.3
Liabilities	27.6
Estimate of Fair Value, Fair Value Disclosure | Asset And Liability Management | Interest Rate Swap Contracts
Derivative Instruments
Assets			115.1
Liabilities			78.2
Estimate of Fair Value, Fair Value Disclosure | Client Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets	4,132.8		2,844.7
Liabilities	4,125.5		2,846.2
Estimate of Fair Value, Fair Value Disclosure | Client Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets	100.2		122.8
Liabilities	95.9		117.0
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 1
Assets
Cash and Due from Banks	2,918.9		3,162.4
Securities
Available for Sale	3,409.6	[1]	1,917.9	[2]
Other Assets
Employee Benefit and Deferred Compensation	97.4		79.3
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	39,267.4		33,762.0
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2
Assets
Federal Funds Sold and Resell Agreements	1,010.0		529.6
Interest-Bearing Deposits with Banks	15,334.5		19,397.4
Federal Reserve Deposits and Other Interest-Bearing			12,911.5
Federal Reserve Deposits	21,328.0
Securities
Available for Sale	24,612.9	[1]	26,376.0	[2]
Held to Maturity	4,195.1		2,321.4
Trading Account	4.3		1.7
Loans (excluding Leases)
Client Security Settlement Receivables	1,538.6		1,355.2
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	207.5		194.7
Community Development Investments	223.8		227.8
Employee Benefit and Deferred Compensation	50.0		47.6
Deposits
Savings Certificates and Other Time	1,869.5		1,877.1
Non U.S. Offices Interest-Bearing	50,586.1		48,461.7
Federal Funds Purchased	786.4		965.1
Securities Sold under Agreements to Repurchase	866.8		917.3
Other Borrowings	1,758.9		1,558.6
Senior Notes	1,526.8		1,989.3
Long Term Debt (excluding Leases)
Subordinated Debt	1,595.5		1,563.5
Federal Home Loan Bank Borrowings			137.2
Floating Rate Capital Debt	242.8		230.2
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2 | Asset And Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets	71.0		21.0
Liabilities	16.1		59.5
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2 | Asset And Liability Management | Interest Rate Contracts
Derivative Instruments
Assets	113.3
Liabilities	27.6
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2 | Asset And Liability Management | Interest Rate Swap Contracts
Derivative Instruments
Assets			115.1
Liabilities			78.2
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2 | Client Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets	4,132.8		2,844.7
Liabilities	4,125.5		2,846.2
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 2 | Client Related and Trading | Interest Rate Contracts
Derivative Instruments
Assets	100.2		122.8
Liabilities	95.9		117.0
Estimate of Fair Value, Fair Value Disclosure | Fair Value, Inputs, Level 3
Securities
Available for Sale	85.2	[1]	98.9	[2]
Loans (excluding Leases)
Held for Investment	29,522.7		28,147.2
Held for Sale	2.1
Other Liabilities
Standby Letters of Credit	57.0		59.6
Contingent Consideration			55.4
Loan Commitments	$ 28.7		$ 35.7

[1] Refer to the table located on page 36 for the disaggregation of available for sale securities.

[2] Refer to the table located on page 37 for the disaggregation of available for sale securities.

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Fair Value Measurements - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
	Apr. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for sale securities portfolio, value		$ 28,107,700,000		$ 28,392,800,000
Trading account securities		4,300,000		1,700,000
Settlement of contingent consideration	55,300,000
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, Assets and Liabilities Measured on Recurring Basis [Line Items]
Number of available for sale securities portfolio		843		831
Available for sale securities portfolio, value		24,600,000,000		26,400,000,000
Loans | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Instrument, fair value		26,600,000	38,100,000
Other Real Estate Owned | Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial Instrument, fair value		1,500,000	1,600,000
External Pricing | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Number of available for sale securities portfolio		842		829
Available for sale securities portfolio, value		24,500,000,000		26,300,000,000
Trading account securities		4,300,000		1,700,000
Internal Pricing | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Number of available for sale securities portfolio				2
Available for sale securities portfolio, value		$ 88,000,000		$ 57,400,000

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Accumulated Other Comprehensive Income (Loss) Changes During Period (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss)	$ (13.2)	$ 12.8	$ 25.9	$ (54.9)
Net Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(9.0)	9.4	51.9	(119.2)
Tax Effect	3.3	(3.6)	(19.6)	44.8
Other Comprehensive Income (Loss)	(5.7)	5.8	32.3	(74.4)
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	5.5		3.7	2.1
Tax Effect	(2.1)		(1.4)	(0.8)
Other Comprehensive Income (Loss)	3.4		2.3	1.3
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	(14.2)	7.3	48.8	(123.2)
Tax Effect	5.4	(2.8)	(18.2)	46.3
Other Comprehensive Income (Loss)	(8.8)	4.5	30.6	(76.9)
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	(0.3)	2.1	(0.6)	1.9
Tax Effect		(0.8)		(0.7)
Other Comprehensive Income (Loss)	(0.3)	1.3	(0.6)	1.2
Net Unrealized Gains (Losses) on Cash Flow Hedge Designations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(11.3)	6.4	(9.8)	1.7
Tax Effect	3.9	(2.1)	3.4	(0.5)
Other Comprehensive Income (Loss)	(7.4)	4.3	(6.4)	1.2
Net Unrealized Gains (Losses) on Cash Flow Hedge Designations | Reclassification Adjustment for (Gains) Losses Included in Net Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(3.7)	1.1	(3.3)	5.7
Tax Effect	1.4	(0.4)	1.2	(2.1)
Other Comprehensive Income (Loss)	(2.3)	0.7	(2.1)	3.6
Net Unrealized Gains (Losses) on Cash Flow Hedge Designations | Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(7.6)	5.3	(6.5)	(4.0)
Tax Effect	2.5	(1.7)	2.2	1.6
Other Comprehensive Income (Loss)	(5.1)	3.6	(4.3)	(2.4)
Net Foreign Currency Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	35.4	(33.8)	13.5	(4.0)
Tax Effect	(39.0)	29.4	(24.0)	1.2
Other Comprehensive Income (Loss)	(3.6)	(4.4)	(10.5)	(2.8)
Net Foreign Currency Adjustments | Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(77.1)	55.0	(57.2)	5.3
Tax Effect	6.6	(4.0)	6.0	(2.3)
Other Comprehensive Income (Loss)	(70.5)	51.0	(51.2)	3.0
Net Foreign Currency Adjustments | Net Investment Hedge Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	119.9	(88.8)	79.7	(9.3)
Tax Effect	(45.6)	33.4	(30.0)	3.5
Other Comprehensive Income (Loss)	74.3	(55.4)	49.7	(5.8)
Net Foreign Currency Adjustments | Long Term Intra Entity Foreign Currency Transaction Losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	(7.4)		(9.0)
Other Comprehensive Income (Loss)	(7.4)		(9.0)
Net Pension and Other Postretirement Benefit Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Before Tax	6.5	11.3	19.0	33.7
Tax Effect	(3.0)	(4.2)	(8.5)	(12.6)
Other Comprehensive Income (Loss)	3.5	7.1	10.5	21.1
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	6.5	11.3	19.0	33.7
Tax Effect	(3.0)	(4.2)	(8.5)	(12.6)
Other Comprehensive Income (Loss)	$ 3.5	$ 7.1	$ 10.5	$ 21.1

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Offsetting of Derivative Liabilities and of Securities Sold Under Agreements to Repurchase Within Consolidated Balance Sheet (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Other liabilities	$ 2,591.5	$ 2,338.4

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Net Interest Income (Tables)

9 Months Ended

Sep. 30, 2014

Components of Net Interest Income

The components of net interest income were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014		2013
Interest Income
Loans and Leases	$	184.8	$	185.4	$	553.5	$	558.5
Securities — Taxable		65.1		60.9		198.0		167.6
— Non-Taxable		1.6		2.7		5.7		9.0
Interest-Bearing Deposits with Banks		30.9		36.3		96.6		105.8
Federal Reserve Deposits and Other		11.4		5.8		29.2		12.2
Total Interest Income		293.8		291.1		883.0		853.1
Interest Expense
Deposits		21.6		25.8		64.1		79.9
Federal Funds Purchased		0.5		0.4		1.1		1.0
Securities Sold Under Agreements to Repurchase		0.1		0.1		0.3		0.3
Other Borrowings		0.9		0.8		2.4		2.5
Senior Notes		11.6		18.4		42.8		56.9
Long-Term Debt		9.2		8.0		29.0		27.5
Floating Rate Capital Debt		0.6		0.6		1.7		1.8
Total Interest Expense		44.5		54.1		141.4		169.9
Net Interest Income	$	249.3	$	237.0	$	741.6	$	683.2

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Reconciliation of Amortized Cost to Fair Values of Securities Held to Maturity (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 4,196.7	$ 2,325.8
Gross Unrealized Gains	17.4	12.3
Gross Unrealized Losses	19.0	16.7
Fair Value	4,195.1	2,321.4
Obligations of States and Political Subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	138.8	225.2
Gross Unrealized Gains	8.5	10.3
Fair Value	147.3	235.5
U.S. Government Sponsored Agency
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	22.8	35.9
Gross Unrealized Gains	1.1	1.1
Fair Value	23.9	37.0
Non-U.S. Government
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,094.1	722.0
Gross Unrealized Gains	3.7	0.8
Gross Unrealized Losses	0.7	1.1
Fair Value	1,097.1	721.7
Certificates of Deposit
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,479.5	698.1
Gross Unrealized Gains	0.2
Gross Unrealized Losses	0.1	0.2
Fair Value	1,479.6	697.9
Supranational and Non-U.S. Agency Bonds
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,393.9	584.7
Gross Unrealized Gains	3.9
Gross Unrealized Losses	1.9	3.2
Fair Value	1,395.9	581.5
Others
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	67.6	59.9
Gross Unrealized Gains		0.1
Gross Unrealized Losses	16.3	12.2
Fair Value	$ 51.3	$ 47.8

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Pledged Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	$ 32,400,000,000		$ 32,400,000,000		$ 32,400,000,000
Fair value of accepted collateral	1,000,000,000		1,000,000,000		500,000,000
Amount of securities repledged or sold collateral	0		0		0
Average deposits maintained to meet Federal Reserve Bank reserve requirements	1,300,000,000	900,000,000	1,300,000,000	900,000,000
US Government Corporations and Agencies Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	23,500,000,000		23,500,000,000		22,600,000,000
Obligations of States and Political Subdivisions
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	137,000,000		137,000,000		222,700,000
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	8,800,000,000		8,800,000,000		9,600,000,000
Collateral Requirements
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	3,500,000,000		3,500,000,000		5,000,000,000
Available for Sale Investment Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	$ 865,500,000		$ 865,500,000		$ 915,300,000

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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, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	$ 30,719.9	$ 29,385.5
1 to 3 Category
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	15,208.4	13,955.8
4 to 5 Category
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	14,818.9	14,620.2
6 to 9 Category (Watch List)
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	692.6	809.5
Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	8,212.1	7,375.8
Commercial Real Estate	3,107.7	2,955.8
Lease Financing, net	952.5	975.1
Non-U.S.	1,408.4	954.7
Other	187.9	358.6
Total Loans and Leases	13,868.6	12,620.0
Commercial | 1 to 3 Category
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	5,115.4	4,432.5
Commercial Real Estate	1,263.6	1,053.7
Lease Financing, net	572.2	685.7
Non-U.S.	643.7	442.8
Other	137.4	157.7
Total Loans and Leases	7,732.3	6,772.4
Commercial | 4 to 5 Category
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	2,983.6	2,801.5
Commercial Real Estate	1,718.2	1,748.7
Lease Financing, net	376.1	285.0
Non-U.S.	763.8	511.9
Other	50.5	200.9
Total Loans and Leases	5,892.2	5,548.0
Commercial | 6 to 9 Category (Watch List)
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	113.1	141.8
Commercial Real Estate	125.9	153.4
Lease Financing, net	4.2	4.4
Non-U.S.	0.9
Total Loans and Leases	244.1	299.6
Personal
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	9,872.7	10,271.3
Private Client	6,953.1	6,445.6
Other	25.5	48.6
Total Loans and Leases	16,851.3	16,765.5
Personal | 1 to 3 Category
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	2,995.7	3,204.6
Private Client	4,461.8	3,957.6
Other	18.6	21.2
Total Loans and Leases	7,476.1	7,183.4
Personal | 4 to 5 Category
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	6,439.9	6,563.6
Private Client	2,479.9	2,481.2
Other	6.9	27.4
Total Loans and Leases	8,926.7	9,072.2
Personal | 6 to 9 Category (Watch List)
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	437.1	503.1
Private Client	11.4	6.8
Total Loans and Leases	$ 448.5	$ 509.9

XML

Changes in Level 3 Assets (Parenthetical) (Detail) (Auction Rate Securities, Redemptions by Issuers, USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013
Auction Rate Securities | Redemptions by Issuers
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Realized gains (losses) on securities	$ 0.7	$ 0.7	$ 0.1

XML

Basis of Presentation

9 Months Ended

Sep. 30, 2014

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 September 30, 2014, and 2013, 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. For a description of Northern Trust’s significant accounting policies, refer to Note 1 of the Notes to Consolidated Financial Statements in the 2013 Annual Report to Shareholders.

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Balances and Delinquency Status of Performing and Nonperforming Loans and Leases by Segment and Class as well as Total Other Real Estate Owned and Nonperforming Asset Balances (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Other Real Estate Owned	$ 10.7	$ 11.9
Total Nonperforming Assets	231.2	274.7
Total Loans and Leases	30,719.9	29,385.5
Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	13,868.6	12,620.0
Commercial | Commercial and Institutional
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	8,212.1	7,375.8
Commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	3,107.7	2,955.8
Commercial | Lease Financing, net
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	952.5	975.1
Commercial | Non-U.S.
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	1,408.4	954.7
Commercial | Other
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	187.9	358.6
Personal
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	16,851.3	16,765.5
Personal | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	9,872.7	10,271.3
Personal | Private Client
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	6,953.1	6,445.6
Personal | Other
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	25.5	48.6
Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Current	30,392.4	28,889.0
30-59 Days Past Due	47.0	167.5
60-89 Days Past Due	34.9	49.8
90 Days or More Past Due	25.1	16.4
Total Loans and Leases	30,499.4	29,122.7
Performing Financing Receivable | Commercial
Financing Receivable, Recorded Investment [Line Items]
Current	13,747.0	12,501.8
30-59 Days Past Due	18.0	9.1
60-89 Days Past Due	18.5	26.7
90 Days or More Past Due	13.5	10.1
Total Loans and Leases	13,797.0	12,547.7
Performing Financing Receivable | Commercial | Commercial and Institutional
Financing Receivable, Recorded Investment [Line Items]
Current	8,153.8	7,332.3
30-59 Days Past Due	10.2	5.0
60-89 Days Past Due	13.3	12.1
90 Days or More Past Due	3.1	3.3
Total Loans and Leases	8,180.4	7,352.7
Performing Financing Receivable | Commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Current	3,044.4	2,881.1
30-59 Days Past Due	7.8	4.1
60-89 Days Past Due	5.2	14.6
90 Days or More Past Due	10.4	6.8
Total Loans and Leases	3,067.8	2,906.6
Performing Financing Receivable | Commercial | Lease Financing, net
Financing Receivable, Recorded Investment [Line Items]
Current	952.5	975.1
Total Loans and Leases	952.5	975.1
Performing Financing Receivable | Commercial | Non-U.S.
Financing Receivable, Recorded Investment [Line Items]
Current	1,408.4	954.7
Total Loans and Leases	1,408.4	954.7
Performing Financing Receivable | Commercial | Other
Financing Receivable, Recorded Investment [Line Items]
Current	187.9	358.6
Total Loans and Leases	187.9	358.6
Performing Financing Receivable | Personal
Financing Receivable, Recorded Investment [Line Items]
Current	16,645.4	16,387.2
30-59 Days Past Due	29.0	158.4
60-89 Days Past Due	16.4	23.1
90 Days or More Past Due	11.6	6.3
Total Loans and Leases	16,702.4	16,575.0
Performing Financing Receivable | Personal | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Current	9,702.1	9,934.4
30-59 Days Past Due	7.9	129.3
60-89 Days Past Due	9.0	15.6
90 Days or More Past Due	6.4	2.9
Total Loans and Leases	9,725.4	10,082.2
Performing Financing Receivable | Personal | Private Client
Financing Receivable, Recorded Investment [Line Items]
Current	6,917.8	6,404.2
30-59 Days Past Due	21.1	29.1
60-89 Days Past Due	7.4	7.5
90 Days or More Past Due	5.2	3.4
Total Loans and Leases	6,951.5	6,444.2
Performing Financing Receivable | Personal | Other
Financing Receivable, Recorded Investment [Line Items]
Current	25.5	48.6
Total Loans and Leases	25.5	48.6
Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	220.5	262.8
Nonperforming Financing Receivable | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	71.6	72.3
Nonperforming Financing Receivable | Commercial | Commercial and Institutional
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	31.7	23.1
Nonperforming Financing Receivable | Commercial | Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	39.9	49.2
Nonperforming Financing Receivable | Personal
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	148.9	190.5
Nonperforming Financing Receivable | Personal | Residential Real Estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	147.3	189.1
Nonperforming Financing Receivable | Personal | Private Client
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	$ 1.6	$ 1.4

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Valuation Techniques, Significant Unobservable Inputs, and Quantitative Information (Detail) (Fair Value, Inputs, Level 3, Auction Rate Securities, USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instrument, fair value	$ 85.2
Group One
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique	Discounted Cash Flow
Unobservable Inputs	Remaining lives
Group Two
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Technique	Discounted Cash Flow
Unobservable Inputs	Discount rates
Lower Limit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instrument remaining lives	1 year 8 months 12 days
Financial instrument discount rate	0.20%
Upper Limit
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Financial instrument remaining lives	8 years 7 months 6 days
Financial instrument discount rate	7.90%

XML

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

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 September 30, 2014, and December 31, 2013, segregated by fair value hierarchy level.

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
September 30, 2014
Securities
Available for Sale
U.S. Government	$	3,409.6	$	—	$	—	$	—		$	3,409.6
Obligations of States and Political Subdivisions		—		4.6		—		—			4.6
Government Sponsored Agency		—		16,174.4		—		—			16,174.4
Non-U.S. Government		—		310.5		—		—			310.5
Corporate Debt		—		3,364.8		—		—			3,364.8
Covered Bonds		—		1,978.9		—		—			1,978.9
Supranational and Non-U.S. Agency Bonds		—		360.2		—		—			360.2
Residential Mortgage-Backed		—		17.6		—		—			17.6
Other Asset-Backed		—		2,233.1		—		—			2,233.1
Auction Rate		—		—		85.2		—			85.2
Other		—		168.8		—		—			168.8
Total Available for Sale		3,409.6		24,612.9		85.2		—			28,107.7
Trading Account		—		4.3		—		—			4.3
Total Available for Sale and Trading Securities		3,409.6		24,617.2		85.2		—			28,112.0
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		4,203.8		—		—			4,203.8
Interest Rate Contracts		—		213.5		—		—			213.5
Total Derivative Assets		—		4,417.3		—		(2,358.4	)		2,058.9
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		4,141.6		—		—			4,141.6
Interest Rate Swaps		—		123.5		—		—			123.5
Total Derivative Liabilities	$	—	$	4,265.1	$	—	$	(2,752.3	)	$	1,512.8

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of September 30, 2014, derivative assets and liabilities shown above also include reductions of $207.4 million and $601.3 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
December 31, 2013
Securities
Available for Sale
U.S. Government	$	1,917.9	$	—	$	—	$	—		$	1,917.9
Obligations of States and Political Subdivisions		—		4.6		—		—			4.6
Government Sponsored Agency		—		17,528.0		—		—			17,528.0
Non-U.S. Government		—		310.6		—		—			310.6
Corporate Debt		—		3,524.5		—		—			3,524.5
Covered Bonds		—		1,943.9		—		—			1,943.9
Supranational and Non-U.S. Agency Bonds		—		410.0		—		—			410.0
Residential Mortgage-Backed		—		48.1		—		—			48.1
Other Asset-Backed		—		2,391.8		—		—			2,391.8
Auction Rate		—		—		98.9		—			98.9
Other		—		214.5		—		—			214.5
Total Available for Sale		1,917.9		26,376.0		98.9		—			28,392.8
Trading Account		—		1.7		—		—			1.7
Total Available for Sale and Trading Securities		1,917.9		26,377.7		98.9		—			28,394.5
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		2,865.7		—		—			2,865.7
Interest Rate Contracts		—		237.9		—		—			237.9
Total Derivative Assets		—		3,103.6		—		(1,369.0	)		1,734.6
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		2,905.7		—		—			2,905.7
Interest Rate Swaps		—		195.2		—		—			195.2
Total Derivative Liabilities		—		3,100.9		—		(1,926.0	)		1,174.9
Contingent Consideration	$	—	$	—	$	55.4	$	—		$	55.4

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 December 31, 2013, derivative assets and liabilities shown above also include reductions of $210.7 million and $767.7 million, 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 nine months ended September 30, 2014, and 2013.

Level 3 Assets (In Millions)	Auction Rate Securities
Three Months Ended September 30,	2014			2013
Fair Value at July 1	$	98.8		$	99.1
Total Gains (Losses):
Included in Earnings		0.7			—
Included in Other Comprehensive Income (2)		0.1			0.3
Purchases, Issues, Sales, and Settlements:
Sales		(14.4	)		—
Fair Value at September 30	$	85.2		$	98.7

Nine Months Ended September 30,	2014			2013
Fair Value at January 1	$	98.9		$	97.8
Total Gains (Losses):
Included in Earnings (1)		0.7			0.1
Included in Other Comprehensive Income (2)		0.4			3.0
Purchases, Issues, Sales, and Settlements:
Sales		(14.4	)		—
Settlements		(0.4	)		(2.2	)
Fair Value at September 30	$	85.2		$	98.7

(1) Realized gains for the three and nine months ended September 30, 2014, of $0.7 million, represent gains from sales of securities. Realized gains for the nine month period ended September 30, 2013, of $0.1 million, represent gains from redemptions by issuers. Gains on sales are recorded in investment security gains (losses) and gains on redemptions are recorded in interest income, within the consolidated statement of income.

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

Changes in Level 3 Liabilities

Level 3 Liabilities (In Millions)	Contingent Consideration
Three Months Ended September 30,	2014			2013
Fair Value at July 1	$	—		$	52.7
Total (Gains) Losses:
Included in Earnings (1)		—			1.3
Included in Other Comprehensive Income		—			—
Purchases, Issues, Sales, and Settlements		—			—
Fair Value at September 30	$	—		$	54.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at September 30 (1)	$	—		$	1.3
Nine Months Ended September 30,	2014			2013
Fair Value at January 1	$	55.4		$	50.1
Total (Gains) Losses:
Included in Earnings (1)		(0.1	)		3.9
Included in Other Comprehensive Income		—			—
Purchases, Issues, Sales, and Settlements:
Settlements		(55.3	)		—
Fair Value at September 30	$	—		$	54.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at September 30 (1)	$	—		$	3.9

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

Book and Fair Values of All Financial Instruments

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

(In Millions)	September 30, 2014
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	2,918.9	$	2,918.9	$	2,918.9	$	—	$	—
Federal Funds Sold and Resell Agreements		1,010.0		1,010.0		—		1,010.0		—
Interest-Bearing Deposits with Banks		15,334.5		15,334.5		—		15,334.5		—
Federal Reserve Deposits		21,328.0		21,328.0		—		21,328.0		—
Securities
Available for Sale (1)		28,107.7		28,107.7		3,409.6		24,612.9		85.2
Held to Maturity		4,196.7		4,195.1		—		4,195.1		—
Trading Account		4.3		4.3		—		4.3		—
Loans (excluding Leases)
Held for Investment		29,499.6		29,522.7		—		—		29,522.7
Held for Sale		2.1		2.1		—		—		2.1
Client Security Settlement Receivables		1,538.6		1,538.6		—		1,538.6		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		207.5		207.5		—		207.5		—
Community Development Investments		225.1		223.8		—		223.8		—
Employee Benefit and Deferred Compensation		145.2		147.4		97.4		50.0		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	39,267.4	$	39,267.4	$	39,267.4	$	—	$	—
Savings Certificates and Other Time		1,869.0		1,869.5		—		1,869.5		—
Non U.S. Offices Interest-Bearing		50,586.1		50,586.1		—		50,586.1		—
Federal Funds Purchased		786.4		786.4		—		786.4		—
Securities Sold under Agreements to Repurchase		866.8		866.8		—		866.8		—
Other Borrowings		1,758.3		1,758.9		—		1,758.9		—
Senior Notes		1,496.9		1,526.8		—		1,526.8		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,565.5		1,595.5		—		1,595.5		—
Federal Home Loan Bank Borrowings		—		—		—		—		—
Floating Rate Capital Debt		277.2		242.8		—		242.8		—
Other Liabilities
Standby Letters of Credit		57.0		57.0		—		—		57.0
Loan Commitments		28.7		28.7		—		—		28.7
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	71.0	$	71.0	$	—	$	71.0	$	—
Liabilities		16.1		16.1		—		16.1		—
Interest Rate Contracts
Assets		113.3		113.3		—		113.3		—
Liabilities		27.6		27.6		—		27.6		—
Client-Related and Trading
Foreign Exchange Contracts
Assets		4,132.8		4,132.8		—		4,132.8		—
Liabilities		4,125.5		4,125.5		—		4,125.5		—
Interest Rate Contracts
Assets		100.2		100.2		—		100.2		—
Liabilities		95.9		95.9		—		95.9		—

(1) Refer to the table located on page 36 for the disaggregation of available for sale securities.

(In Millions)	December 31, 2013
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	3,162.4	$	3,162.4	$	3,162.4	$	—	$	—
Federal Funds Sold and Resell Agreements		529.6		529.6		—		529.6		—
Interest-Bearing Deposits with Banks		19,397.4		19,397.4		—		19,397.4		—
Federal Reserve Deposits and Other Interest-Bearing		12,911.5		12,911.5		—		12,911.5		—
Securities
Available for Sale (1)		28,392.8		28,392.8		1,917.9		26,376.0		98.9
Held to Maturity		2,325.8		2,321.4		—		2,321.4		—
Trading Account		1.7		1.7		—		1.7		—
Loans (excluding Leases)
Held for Investment		28,136.5		28,147.2		—		—		28,147.2
Held for Sale		—		—		—		—		—
Client Security Settlement Receivables		1,355.2		1,355.2		—		1,355.2		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		194.7		194.7		—		194.7		—
Community Development Investments		228.1		227.8		—		227.8		—
Employee Benefit and Deferred Compensation		132.7		126.9		79.3		47.6		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	33,762.0	$	33,762.0	$	33,762.0	$	—	$	—
Savings Certificates and Other Time		1,874.4		1,877.1		—		1,877.1		—
Non U.S. Offices Interest-Bearing		48,461.7		48,461.7		—		48,461.7		—
Federal Funds Purchased		965.1		965.1		—		965.1		—
Securities Sold under Agreements to Repurchase		917.3		917.3		—		917.3		—
Other Borrowings		1,558.6		1,558.6		—		1,558.6		—
Senior Notes		1,996.6		1,989.3		—		1,989.3		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,537.3		1,563.5		—		1,563.5		—
Federal Home Loan Bank Borrowings		135.0		137.2		—		137.2		—
Floating Rate Capital Debt		277.1		230.2		—		230.2		—
Other Liabilities
Standby Letters of Credit		59.6		59.6		—		—		59.6
Contingent Consideration		55.4		55.4		—		—		55.4
Loan Commitments		35.7		35.7		—		—		35.7
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	21.0	$	21.0	$	—	$	21.0	$	—
Liabilities		59.5		59.5		—		59.5		—
Interest Rate Swaps
Assets		115.1		115.1		—		115.1		—
Liabilities		78.2		78.2		—		78.2		—
Client-Related and Trading
Foreign Exchange Contracts
Assets		2,844.7		2,844.7		—		2,844.7		—
Liabilities		2,846.2		2,846.2		—		2,846.2		—
Interest Rate Contracts
Assets		122.8		122.8		—		122.8		—
Liabilities		117.0		117.0		—		117.0		—

(1) Refer to the table located on page 37 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 as of September 30, 2014.

Financial Instrument	Fair Value		Valuation Technique	Unobservable Inputs	Range of Lives and Rates
Auction Rate Securities	$	85.2 million	Discounted Cash Flow	Remaining lives Discount rates	1.7 — 8.6 years 0.2% — 7.9%

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 September 30, 2014.

Financial Instrument	Fair Value	Valuation Technique	Unobservable Input	Range of Discounts Applied
Loans	$26.6 million	Market Approach	Discount to reflect realizable value	15% — 25%
OREO	$1.5 million	Market Approach	Discount to reflect realizable value	15% — 20%

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Offsetting of Assets and Liabilities

9 Months Ended

Sep. 30, 2014

Offsetting of Assets and Liabilities

20. 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 sheet as of September 30, 2014, and December 31, 2013.

September 30, 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 Over the Counter (OTC)	$	3,265.0	$	2,085.0	$	1,180.0	$	—	$	1,180.0
Interest Rate Swaps OTC		183.7		31.5		152.2		—		152.2
Interest Rate Swaps Exchange Cleared		29.8		7.4		22.4		—		22.4
Cross Product Netting Adjustment		—		27.1		—		—		—
Cross Product Collateral Adjustment		—		207.4		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,478.5		2,358.4		1,120.1		—		1,120.1
Total Derivatives Not Subject to a Master Netting Arrangement		938.8		—		938.8		—		938.8
Total Derivatives		4,417.3		2,358.4		2,058.9		—		2,058.9
Securities Purchased under Agreements to Resell (2)	$	1,000.0	$	—	$	1,000.0	$	1,000.0	$	—

December 31, 2013
(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	$	2,612.5	$	1,073.3	$	1,539.2	$	—	$	1,539.2
Interest Rate Swaps OTC		228.8		47.5		181.3		—		181.3
Interest Rate Swaps Exchange Cleared		9.1		9.1		—		—		—
Cross Product Netting Adjustment		—		28.4		—		—		—
Cross Product Collateral Adjustment		—		210.7		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		2,850.4		1,369.0		1,481.4		—		1,481.4
Total Derivatives Not Subject to a Master Netting Arrangement		253.2		—		253.2		—		253.2
Total Derivatives		3,103.6		1,369.0		1,734.6		—		1,734.6
Securities Purchased under Agreements to Resell (2)	$	500.0	$	—	$	500.0	$	500.0	$	—

(1) Derivative assets are reported in other assets in the consolidated balance sheet. Other assets (excluding derivative assets) totaled $3,230.9 million and $3,029.4 million as of September 30, 2014, and December 31, 2013, 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 sheet. Federal funds sold totaled $10.0 million and $29.6 million as of September 30, 2014, and December 31, 2013, respectively.

(3) Northern Trust did not possess any cash collateral that was not offset in the consolidated balance sheet that could have been used to offset the net amounts presented in the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

The following tables provide information regarding the offsetting of derivative liabilities and securities sold under agreements to repurchase within the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

September 30, 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	$	3,404.3	$	2,085.0	$	1,319.3	$	—	$	1,319.3
Interest Rate Swaps OTC		116.1		31.5		84.6		—		84.6
Interest Rate Swaps Exchange Cleared		7.4		7.4		—		—		—
Cross Product Netting Adjustment		—		27.1		—		—		—
Cross Product Collateral Adjustment		—		601.3		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,527.8		2,752.3		775.5		—		775.5
Total Derivatives Not Subject to a Master Netting Arrangement		737.3		—		737.3		—		737.3
Total Derivatives		4,265.1		2,752.3		1,512.8		—		1,512.8
Securities Sold under Agreements to Repurchase	$	866.8	$	—	$	866.8	$	866.8	$	—

December 31, 2013
(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	$	2,039.0	$	1,073.3	$	965.7	$	—	$	965.7
Interest Rate Swaps OTC		163.7		47.5		116.2		—		116.2
Interest Rate Swaps Exchange Cleared		31.5		9.1		22.4		—		22.4
Cross Product Netting Adjustment		—		28.4		—		—		—
Cross Product Collateral Adjustment		—		767.7		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		2,234.2		1,926.0		308.2		—		308.2
Total Derivatives Not Subject to a Master Netting Arrangement		866.7		—		866.7				866.7
Total Derivatives		3,100.9		1,926.0		1,174.9		—		1,174.9
Securities Sold under Agreements to Repurchase	$	917.3	$	—	$	917.3	$	917.3	$	—

(1) Derivative liabilities are reported in other liabilities in the consolidated balance sheet. Other liabilities (excluding derivative liabilities) totaled $2,591.5 million and $2,338.4 million as of September 30, 2014, and December 31, 2013, respectively.

(2) Northern Trust did not place any cash collateral with counterparties that was not offset in the consolidated balance sheet that could have been used to offset the net amounts presented in the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

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 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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Book Values, Ultimate Default Rates, and Loss Severity Rates for Non-Agency Residential Mortgage-Backed Securities Portfolio, by Security Type (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 28,046.2	$ 28,382.3
Non-Agency RMBS
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	18.8
Weighted Average Ultimate Default Rates	33.10%
Loss Severity Rates - Weighted Average	70.30%
Non-Agency RMBS | Lower Limit
Schedule of Available-for-sale Securities [Line Items]
Loss Severity Rates	32.10%
Non-Agency RMBS | Upper Limit
Schedule of Available-for-sale Securities [Line Items]
Loss Severity Rates	99.00%
Non-Agency RMBS | Prime
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2.0
Weighted Average Ultimate Default Rates	5.40%
Loss Severity Rates - Weighted Average	32.10%
Non-Agency RMBS | Prime | Lower Limit
Schedule of Available-for-sale Securities [Line Items]
Loss Severity Rates	32.10%
Non-Agency RMBS | Prime | Upper Limit
Schedule of Available-for-sale Securities [Line Items]
Loss Severity Rates	32.10%
Non-Agency RMBS | Alt-A
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11.2
Weighted Average Ultimate Default Rates	40.00%
Loss Severity Rates - Weighted Average	62.80%
Non-Agency RMBS | Alt-A | Lower Limit
Schedule of Available-for-sale Securities [Line Items]
Loss Severity Rates	62.80%
Non-Agency RMBS | Alt-A | Upper Limit
Schedule of Available-for-sale Securities [Line Items]
Loss Severity Rates	62.80%
Non-Agency RMBS | 2nd Lien
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 5.6
Weighted Average Ultimate Default Rates	32.70%
Loss Severity Rates - Weighted Average	99.00%
Non-Agency RMBS | 2nd Lien | Lower Limit
Schedule of Available-for-sale Securities [Line Items]
Loss Severity Rates	98.70%
Non-Agency RMBS | 2nd Lien | Upper Limit
Schedule of Available-for-sale Securities [Line Items]
Loss Severity Rates	99.00%

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Assets and Liabilities Measured at Fair Value on Recurring Basis Segregated by Fair Value Hierarchy Level (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale	$ 28,107.7		$ 28,392.8
Trading Account	4.3		1.7
Contingent Consideration			55.4
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total Available for Sale and Trading Securities	28,112.0		28,394.5
Contingent Consideration			55.4
Fair Value, Measurements, Recurring | Securities Investment
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale	28,107.7		28,392.8
Trading Account	4.3		1.7
Fair Value, Measurements, Recurring | Securities Investment | U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale	3,409.6		1,917.9
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	4.6		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	16,174.4		17,528.0
Fair Value, Measurements, Recurring | Securities Investment | Non-U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale	310.5		310.6
Fair Value, Measurements, Recurring | Securities Investment | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale	3,364.8		3,524.5
Fair Value, Measurements, Recurring | Securities Investment | Covered Bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale	1,978.9		1,943.9
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	360.2		410.0
Fair Value, Measurements, Recurring | Securities Investment | Residential Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale	17.6		48.1
Fair Value, Measurements, Recurring | Securities Investment | Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale	2,233.1		2,391.8
Fair Value, Measurements, Recurring | Securities Investment | Auction Rate Securities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale	85.2		98.9
Fair Value, Measurements, Recurring | Securities Investment | Others
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Available for Sale	168.8		214.5
Fair Value, Measurements, Recurring | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	2,058.9		1,734.6
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	4,203.8		2,865.7
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	213.5		237.9
Fair Value, Measurements, Recurring | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	1,512.8		1,174.9
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	4,141.6		2,905.7
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	123.5		195.2
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	(2,358.4)	[1]	(1,369.0)	[2]
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	(2,752.3)	[1]	(1,926.0)	[2]
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	3,409.6		1,917.9
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	3,409.6		1,917.9
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	3,409.6		1,917.9
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	24,617.2		26,377.7
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	24,612.9		26,376.0
Trading Account	4.3		1.7
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	4.6		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	16,174.4		17,528.0
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	310.5		310.6
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	3,364.8		3,524.5
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	1,978.9		1,943.9
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	360.2		410.0
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	17.6		48.1
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	2,233.1		2,391.8
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	168.8		214.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	4,417.3		3,103.6
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	4,203.8		2,865.7
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	213.5		237.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liabilities	4,265.1		3,100.9
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	4,141.6		2,905.7
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	123.5		195.2
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	85.2		98.9
Contingent Consideration			55.4
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	85.2		98.9
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	$ 85.2		$ 98.9

[1] Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of September 30, 2014, derivative assets and liabilities shown above also include reductions of $207.4 million and $601.3 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

[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 December 31, 2013, derivative assets and liabilities shown above also include reductions of $210.7 million and $767.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

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Securities (Tables)

9 Months Ended

Sep. 30, 2014

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

The following tables provide the amortized cost and fair values of securities at September 30, 2014, and December 31, 2013.

Securities Available for Sale	September 30, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	3,395.1	$	16.0	$	1.5	$	3,409.6
Obligations of States and Political Subdivisions		4.5		0.1		—		4.6
Government Sponsored Agency		16,114.2		85.4		25.2		16,174.4
Non-U.S. Government		309.3		1.2		—		310.5
Corporate Debt		3,393.5		4.7		33.4		3,364.8
Covered Bonds		1,966.9		12.2		0.2		1,978.9
Supranational and Non-U.S. Agency Bonds		360.0		1.4		1.2		360.2
Residential Mortgage-Backed		18.8		0.1		1.3		17.6
Other Asset-Backed		2,232.0		1.3		0.2		2,233.1
Auction Rate		83.4		2.3		0.5		85.2
Other		168.5		0.3		—		168.8
Total	$	28,046.2	$	125.0	$	63.5	$	28,107.7

Securities Available for Sale	December 31, 2013
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	1,896.7	$	22.6	$	1.4	$	1,917.9
Obligations of States and Political Subdivisions		4.5		0.1		—		4.6
Government Sponsored Agency		17,495.2		80.7		47.9		17,528.0
Non-U.S. Government		307.0		3.6		—		310.6
Corporate Debt		3,615.2		10.5		101.2		3,524.5
Covered Bonds		1,898.9		50.9		5.9		1,943.9
Supranational and Non-U.S. Agency Bonds		410.0		1.7		1.7		410.0
Residential Mortgage-Backed		52.4		0.1		4.4		48.1
Other Asset-Backed		2,390.8		1.4		0.4		2,391.8
Auction Rate		97.5		2.2		0.8		98.9
Other		214.1		0.4		—		214.5
Total	$	28,382.3	$	174.2	$	163.7	$	28,392.8

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

Securities Held to Maturity	September 30, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	138.8	$	8.5	$	—	$	147.3
Government Sponsored Agency		22.8		1.1		—		23.9
Non-U.S. Government		1,094.1		3.7		0.7		1,097.1
Certificates of Deposit		1,479.5		0.2		0.1		1,479.6
Supranational and Non-U.S. Agency Bonds		1,393.9		3.9		1.9		1,395.9
Other		67.6		—		16.3		51.3
Total	$	4,196.7	$	17.4	$	19.0	$	4,195.1

Securities Held to Maturity	December 31, 2013
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	225.2	$	10.3	$	—	$	235.5
Government Sponsored Agency		35.9		1.1		—		37.0
Non-U.S. Government		722.0		0.8		1.1		721.7
Certificates of Deposit		698.1		—		0.2		697.9
Supranational and Non-U.S. Agency Bonds		584.7		—		3.2		581.5
Other		59.9		0.1		12.2		47.8
Total	$	2,325.8	$	12.3	$	16.7	$	2,321.4

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 September 30, 2014, and December 31, 2013.

Securities with Unrealized Losses as of September 30, 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	$	1,596.0	$	1.5	$	—	$	—	$	1,596.0	$	1.5
Government Sponsored Agency		2,099.2		8.3		1,773.5		16.9		3,872.7		25.2
Non-U.S. Government		235.4		0.1		80.3		0.6		315.7		0.7
Corporate Debt		862.3		2.8		1,258.0		30.6		2,120.3		33.4
Covered Bonds		77.0		0.1		9.9		0.1		86.9		0.2
Supranational and Non-U.S. Agency Bonds		438.2		0.7		300.8		2.4		739.0		3.1
Residential Mortgage-Backed		—		—		15.0		1.3		15.0		1.3
Other Asset-Backed		485.2		0.1		7.1		0.1		492.3		0.2
Certificates of Deposit		552.0		0.1		—		—		552.0		0.1
Auction Rate		1.1		0.1		5.1		0.4		6.2		0.5
Other		13.0		8.5		43.4		7.8		56.4		16.3
Total	$	6,359.4	$	22.3	$	3,493.1	$	60.2	$	9,852.5	$	82.5

Securities with Unrealized Losses as of December 31, 2013	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	$	896.4	$	1.4	$	—	$	—	$	896.4	$	1.4
Government Sponsored Agency		4,340.8		42.6		413.7		5.3		4,754.5		47.9
Non-U.S. Government		176.7		1.1		—		—		176.7		1.1
Corporate Debt		1,759.5		85.4		267.0		15.8		2,026.5		101.2
Covered Bonds		278.8		5.7		9.9		0.2		288.7		5.9
Supranational and Non-U.S. Agency Bonds		612.7		4.9		—		—		612.7		4.9
Residential Mortgage-Backed		—		—		42.0		4.4		42.0		4.4
Other Asset-Backed		677.0		0.4		—		—		677.0		0.4
Certificates of Deposit		684.2		0.2		—		—		684.2		0.2
Auction Rate		22.1		0.1		14.0		0.7		36.1		0.8
Other		25.7		4.0		29.5		8.2		55.2		12.2
Total	$	9,473.9	$	145.8	$	776.1	$	34.6	$	10,250.0	$	180.4

Book Values, Ultimate Default Rates, and Loss Severity Rates for Non-Agency Residential Mortgage-Backed Securities Portfolio, by Security Type

Amortized cost, weighted average ultimate default rates, and impairment severity rates for the non-agency residential mortgage-backed securities portfolio, by security type as of September 30, 2014, are provided in the following table.

($ In Millions)	September 30, 2014
	Amortized Cost		Weighted Average Ultimate Default Rates			Loss Severity Rates
Security Type						Low			High			Weighted Average
Prime	$	2.0		5.4	%		32.1	%		32.1	%		32.1	%
Alt-A		11.2		40.0			62.8			62.8			62.8
2nd Lien		5.6		32.7			98.7			99.0			99.0
Total Non-Agency Residential Mortgage-Backed Securities	$	18.8		33.1	%		32.1	%		99.0	%		70.3	%

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 nine months ended September 30, 2014, and 2013.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014			2013
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 other-than-temporary impairments in the respective 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 other-than-temporary impairments in the respective period, the balance includes the portion of the excess of amortized cost over the fair value of the impaired securities that was recorded in 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.

	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	2014			2013		2014			2013
Cumulative Credit-Related Losses on Securities Held — Beginning of Period	$	12.7		$	8.8	$	8.8		$	42.3
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		(1.8	)		—		(1.8	)		(33.5	)
Cumulative Credit-Related Losses on Securities Held — End of Period	$	10.9		$	8.8	$	10.9		$	8.8

Held-to-maturity Securities

Remaining Maturity of Securities

Held to Maturity
Due in One Year or Less		1,914.1		1,915.3
Due After One Year Through Five Years		2,222.2		2,230.5
Due After Five Years Through Ten Years		23.3		24.1
Due After Ten Years		37.1		25.2
Total	$	4,196.7	$	4,195.1

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

Available for Sale Investment Securities

Remaining Maturity of Securities

The following table provides the remaining maturity of securities as of September 30, 2014.

Remaining Maturity of Securities
(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	7,195.0	$	7,210.6
Due After One Year Through Five Years		16,637.9		16,677.9
Due After Five Years Through Ten Years		3,116.8		3,138.1
Due After Ten Years		1,096.5		1,081.1
Total		28,046.2		28,107.7

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Loans and Leases (Tables)

9 Months Ended

Sep. 30, 2014

Amounts Outstanding for Loans and Leases by Segment and Class

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

(In Millions)	September 30, 2014			December 31, 2013
Commercial
Commercial and Institutional	$	8,212.1		$	7,375.8
Commercial Real Estate		3,107.7			2,955.8
Lease Financing, net		952.5			975.1
Non-U.S.		1,408.4			954.7
Other		187.9			358.6
Total Commercial		13,868.6			12,620.0
Personal
Residential Real Estate		9,872.7			10,271.3
Private Client		6,953.1			6,445.6
Other		25.5			48.6
Total Personal		16,851.3			16,765.5
Total Loans and Leases		30,719.9			29,385.5
Allowance for Credit Losses Assigned to Loans and Leases		(269.4	)		(278.1	)
Net Loans and Leases	$	30,450.5		$	29,107.4

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 September 30, 2014, and December 31, 2013, are provided below, segregated by borrower ratings into “1 to 3”, “4 to 5” and “6 to 9” (watch list), categories.

	September 30, 2014								December 31, 2013
(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	$	5,115.4	$	2,983.6	$	113.1	$	8,212.1	$	4,432.5	$	2,801.5	$	141.8	$	7,375.8
Commercial Real Estate		1,263.6		1,718.2		125.9		3,107.7		1,053.7		1,748.7		153.4		2,955.8
Lease Financing, net		572.2		376.1		4.2		952.5		685.7		285.0		4.4		975.1
Non-U.S.		643.7		763.8		0.9		1,408.4		442.8		511.9		—		954.7
Other		137.4		50.5		—		187.9		157.7		200.9		—		358.6
Total Commercial		7,732.3		5,892.2		244.1		13,868.6		6,772.4		5,548.0		299.6		12,620.0
Personal
Residential Real Estate		2,995.7		6,439.9		437.1		9,872.7		3,204.6		6,563.6		503.1		10,271.3
Private Client		4,461.8		2,479.9		11.4		6,953.1		3,957.6		2,481.2		6.8		6,445.6
Other		18.6		6.9		—		25.5		21.2		27.4		—		48.6
Total Personal		7,476.1		8,926.7		448.5		16,851.3		7,183.4		9,072.2		509.9		16,765.5
Total Loans and Leases	$	15,208.4	$	14,818.9	$	692.6	$	30,719.9	$	13,955.8	$	14,620.2	$	809.5	$	29,385.5

Balances and Delinquency Status of Performing and Nonperforming Loans and Leases by Segment and Class as well as Total Other Real Estate Owned 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 other real estate owned and nonperforming asset balances, as of September 30, 2014, and December 31, 2013.

September 30, 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	$	8,153.8	$	10.2	$	13.3	$	3.1	$	8,180.4	$	31.7	$	8,212.1
Commercial Real Estate		3,044.4		7.8		5.2		10.4		3,067.8		39.9		3,107.7
Lease Financing, net		952.5		—		—		—		952.5		—		952.5
Non-U.S.		1,408.4		—		—		—		1,408.4		—		1,408.4
Other		187.9		—		—		—		187.9		—		187.9
Total Commercial		13,747.0		18.0		18.5		13.5		13,797.0		71.6		13,868.6
Personal
Residential Real Estate		9,702.1		7.9		9.0		6.4		9,725.4		147.3		9,872.7
Private Client		6,917.8		21.1		7.4		5.2		6,951.5		1.6		6,953.1
Other		25.5		—		—		—		25.5		—		25.5
Total Personal		16,645.4		29.0		16.4		11.6		16,702.4		148.9		16,851.3
Total Loans and Leases	$	30,392.4	$	47.0	$	34.9	$	25.1	$	30,499.4	$	220.5	$	30,719.9
								Other Real Estate Owned				10.7
								Total Nonperforming Assets			$	231.2

December 31, 2013
(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	$	7,332.3	$	5.0	$	12.1	$	3.3	$	7,352.7	$	23.1	$	7,375.8
Commercial Real Estate		2,881.1		4.1		14.6		6.8		2,906.6		49.2		2,955.8
Lease Financing, net		975.1		—		—		—		975.1		—		975.1
Non-U.S.		954.7		—		—		—		954.7		—		954.7
Other		358.6		—		—		—		358.6		—		358.6
Total Commercial		12,501.8		9.1		26.7		10.1		12,547.7		72.3		12,620.0
Personal
Residential Real Estate		9,934.4		129.3		15.6		2.9		10,082.2		189.1		10,271.3
Private Client		6,404.2		29.1		7.5		3.4		6,444.2		1.4		6,445.6
Other		48.6		—		—		—		48.6		—		48.6
Total Personal		16,387.2		158.4		23.1		6.3		16,575.0		190.5		16,765.5
Total Loans and Leases	$	28,889.0	$	167.5	$	49.8	$	16.4	$	29,122.7	$	262.8	$	29,385.5
								Other Real Estate Owned				11.9
								Total Nonperforming Assets			$	274.7

Impaired Loans By Segment and Class

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

	As of September 30, 2014						As of December 31, 2013
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Allowance		Recorded Investment		Unpaid Principal Balance		Specific Allowance
With No Related Specific Allowance
Commercial and Institutional	$	11.6	$	14.6	$	—	$	12.2	$	18.1	$	—
Commercial Real Estate		49.2		54.9		—		46.6		57.1		—
Lease Financing, net		4.2		4.2		—		4.4		4.4		—
Residential Real Estate		170.2		214.5		—		185.0		227.8		—
Private Client		0.1		0.4		—		0.8		0.8		—
With a Related Specific Allowance
Commercial and Institutional		20.5		20.5		5.1		9.6		12.1		3.6
Commercial Real Estate		12.4		18.4		3.5		26.7		31.5		4.5
Residential Real Estate		1.3		1.5		0.4		8.1		8.7		2.3
Private Client		0.9		0.9		0.5		—		—		—
Total
Commercial		97.9		112.6		8.6		99.5		123.2		8.1
Personal		172.5		217.3		0.9		193.9		237.3		2.3
Total	$	270.4	$	329.9	$	9.5	$	293.4	$	360.5	$	10.4

	Three Months Ended September 30,								Nine Months Ended September 30,
	2014				2013				2014				2013
(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	$	12.6	$	0.1	$	10.7	$	—	$	11.5	$	0.1	$	11.3	$	0.1
Commercial Real Estate		48.5		0.2		42.0		0.2		46.0		0.7		40.6		0.6
Lease Financing, net		4.3		0.1		4.5		0.1		4.3		0.2		4.6		0.2
Residential Real Estate		172.0		0.8		168.1		0.3		180.8		2.1		155.2		1.4
Private Client		0.3		—		13.3		0.2		0.6		—		12.0		0.5
With a Related Specific Allowance
Commercial and Institutional		11.9		—		14.1		—		10.6		—		12.5		—
Commercial Real Estate		13.7		—		31.2		—		20.9		—		31.6		—
Residential Real Estate		1.3		—		10.0		—		4.1		—		9.4		—
Private Client		0.9		—		0.8		—		0.5		—		1.1		—
Total
Commercial		91.0		0.4		102.5		0.3		93.3		1.0		100.6		0.9
Personal		174.5		0.8		192.2		0.5		186.0		2.1		177.7		1.9
Total	$	265.5	$	1.2	$	294.7	$	0.8	$	279.3	$	3.1	$	278.3	$	2.8

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

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 nine month periods ended September 30, 2014, and 2013, and the recorded investments and unpaid principal balances as of September 30, 2014, and 2013.

($ In Millions)	Three Months Ended September 30, 2014						Nine Months Ended September 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		1	$	0.4	$	0.4		3	$	0.7	$	0.8
Commercial Real Estate		5		2.9		3.4		6		3.5		4.1
Total Commercial		6		3.3		3.8		9		4.2		4.9
Personal
Residential Real Estate		28		18.0		18.7		96		25.3		27.1
Private Client		—		—		—		3		—		0.3
Total Personal		28		18.0		18.7		99		25.3		27.4
Total Loans and Leases		34	$	21.3	$	22.5		108	$	29.5	$	32.3

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

($ In Millions)	Three Months Ended September 30, 2013						Nine Months Ended September 30, 2013
	Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance		Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance
Commercial
Commercial and Institutional		—	$	—	$	—		7	$	0.5	$	1.0
Commercial Real Estate		7		22.8		25.0		11		27.4		31.9
Total Commercial		7		22.8		25.0		18		27.9		32.9
Personal
Residential Real Estate		38		6.7		11.4		122		51.2		59.8
Private Client		—		—		—		6		12.8		12.8
Total Personal		38		6.7		11.4		128		64.0		72.6
Total Loans and Leases		45	$	29.5	$	36.4		146	$	91.9	$	105.5

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

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Consolidated Statement of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013
Cash Flows from Operating Activities:
Net Income	$ 567.8		$ 561.6
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Investment Security Losses (Gains), net	3.3	[1]	1.9	[1]
Amortization and Accretion of Securities and Unearned Income, net	30.1		25.8
Provision for Credit Losses	3.0		15.0
Depreciation on Buildings and Equipment	68.0		69.5
(Gains) Losses on Sale of Buildings and Equipment			(32.6)
Computer Software Write-Offs	9.5
Pension Plan Contributions	(13.9)		(16.4)
Change in Receivables	42.1		(27.9)
Change in Interest Payable	(2.9)		(14.7)
Change in Collateral With Derivative Counterparties, net	163.1		111.0
Other Operating Activities, net	220.8		99.7
Net Cash Provided by Operating Activities	1,273.5		960.9
Cash Flows from Investing Activities:
Net Change in Federal Funds Sold and Securities Purchased under Agreements to Resell	(480.4)		(223.8)
Change in Interest-Bearing Deposits with Banks	3,498.1		1,150.7
Net Change in Federal Reserve Deposits	(8,416.5)		(833.2)
Purchases of Securities - Held to Maturity	(5,596.9)		(5,068.8)
Proceeds from Maturity and Redemption of Securities - Held to Maturity	3,505.4		4,515.8
Purchases of Securities - Available for Sale	(8,969.2)		(5,333.4)
Proceeds from Sale, Maturity and Redemption of Securities - Available for Sale	9,254.9		6,359.2
Change in Loans and Leases	(1,352.0)		387.6
Purchases of Buildings and Equipment	(51.0)		(43.8)
Proceeds from Sale of Buildings			38.8
Purchases and Development of Computer Software	(235.2)		(203.8)
Change in Client Security Settlement Receivables	(181.8)		416.7
Other Investing Activities, net	(41.3)		(652.0)
Net Cash (Used in) Provided by Investing Activities	(9,065.9)		510.0
Cash Flows from Financing Activities:
Change in Deposits	8,556.6		(2,845.7)
Change in Federal Funds Purchased	(178.7)		273.4
Change in Securities Sold under Agreements to Repurchase	(50.5)		(230.8)
Change in Short-Term Other Borrowings	33.4		1,382.4
Repayments of Senior Notes and Long-Term Debt	(638.7)		(803.2)
Contingent Consideration Liability Payment	(55.3)
Proceeds from Issuance of Preferred Stock - Series C	388.5
Treasury Stock Purchased	(315.2)		(186.8)
Net Proceeds from Stock Options	122.0		134.1
Cash Dividends Paid on Common Stock	(225.4)		(146.3)
Other Financing Activities, net	(145.6)		(2.9)
Net Cash Provided by (Used in) Financing Activities	7,491.1		(2,425.8)
Effect of Foreign Currency Exchange Rates on Cash	57.8		(107.1)
Decrease in Cash and Due from Banks	(243.5)		(1,062.0)
Cash and Due from Banks at Beginning of Year	3,162.4		3,752.7
Cash and Due from Banks at End of Period	2,918.9		2,690.7
Supplemental Disclosures of Cash Flow Information:
Interest Paid	146.4		185.0
Income Taxes Paid	159.7		184.2
Transfers from Loans to OREO	10.0		16.4
Computer Software
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangibles	167.9		152.5
Other Intangible Assets
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Amortization of Intangibles	$ 14.7		$ 15.5

[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 0.3 (2.2 ) 0.6 (1.9 ) Investment Security Gains (Losses), net $ 0.3 $ (2.2 ) $ (3.3 ) $ (1.9 )

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Allowance for Credit Losses (Tables)

9 Months Ended

Sep. 30, 2014

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 nine months ended September 30, 2014, and 2013.

	Three Months Ended September 30,
	2014									2013
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	168.7		$	134.8		$	303.5		$	184.1		$	136.6		$	320.7
Charge-Offs		(2.5	)		(6.1	)		(8.6	)		(1.7	)		(9.9	)		(11.6	)
Recoveries		1.9			1.5			3.4			1.7			1.6			3.3
Net (Charge-Offs) Recoveries		(0.6	)		(4.6	)		(5.2	)		—			(8.3	)		(8.3	)
Provision for Credit Losses		1.0			(1.0	)		—			(4.6	)		9.6			5.0
Effect of Foreign Exchange Rates		—			—			—			0.1			—			0.1
Balance at End of Period	$	169.1		$	129.2		$	298.3		$	179.6		$	137.9		$	317.5

	Nine Months Ended September 30,
	2014									2013
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	168.0		$	139.9		$	307.9		$	194.2		$	133.4		$	327.6
Charge-Offs		(8.8	)		(19.1	)		(27.9	)		(6.9	)		(32.9	)		(39.8	)
Recoveries		10.7			4.6			15.3			8.1			6.6			14.7
Net (Charge-Offs) Recoveries		1.9			(14.5	)		(12.6	)		1.2			(26.3	)		(25.1	)
Provision for Credit Losses		(0.8	)		3.8			3.0			(15.8	)		30.8			15.0
Effect of Foreign Exchange Rates		—			—			—			—			—			—
Balance at End of Period	$	169.1		$	129.2		$	298.3		$	179.6		$	137.9		$	317.5

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 September 30, 2014, and December 31, 2013.

	September 30, 2014						December 31, 2013
(In Millions)	Commercial		Personal		Total		Commercial		Personal		Total
Loans and Leases
Specifically Evaluated for Impairment	$	97.9	$	172.5	$	270.4	$	99.5	$	193.9	$	293.4
Evaluated for Inherent Impairment		13,770.7		16,678.8		30,449.5		12,520.5		16,571.6		29,092.1
Total Loans and Leases		13,868.6		16,851.3		30,719.9		12,620.0		16,765.5		29,385.5
Allowance for Loans and Leases
Specifically Evaluated for Impairment		8.6		0.9		9.5		8.1		2.3		10.4
Evaluated for Inherent Impairment		134.5		125.4		259.9		132.8		134.9		267.7
Allowance Assigned to Loans and Leases		143.1		126.3		269.4		140.9		137.2		278.1
Allowance for Unfunded Exposures
Commitments and Standby Letters of Credit		26.0		2.9		28.9		27.1		2.7		29.8
Total Allowance for Credit Losses	$	169.1	$	129.2	$	298.3	$	168.0	$	139.9	$	307.9

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Variable Interest Entities - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014 Tax Credit Structures	Sep. 30, 2014 Tax Credit Structures	Dec. 31, 2013 Tax Credit Structures	Sep. 30, 2014 Leveraged Leasing Transactions	Dec. 31, 2013 Leveraged Leasing Transactions	Sep. 30, 2014 Leveraged Leasing Transactions Lower Limit	Sep. 30, 2013 Leveraged Leasing Transactions Lower Limit	Sep. 30, 2014 Leveraged Leasing Transactions Upper Limit	Sep. 30, 2013 Leveraged Leasing Transactions Upper Limit
Variable Interest Entity [Line Items]
Funding of asset's cost via an equity interest						20.00%	20.00%	30.00%	30.00%
Funding of asset's cost via third party non recourse debt holders						70.00%	70.00%	80.00%	80.00%
Carrying amounts	$ 224,100,000	$ 224,100,000	$ 222,300,000	$ 579,100,000	$ 671,200,000
Exposure to loss from liquidity arrangements and obligations to purchase assets	0	0		0
Liabilities related to unfunded commitments	27,400,000	27,400,000	19,800,000
Affordable housing tax credits and other tax benefits	$ 14,500,000	$ 43,200,000

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2014

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 sheet. 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.

	September 30, 2014						December 31, 2013
	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	270,022.4	$	4,132.8	$	4,125.5	$	243,135.0	$	2,844.7	$	2,846.2
Interest Rate Contracts		5,048.9		100.2		95.9		5,001.7		122.8		117.0
Total	$	275,071.3	$	4,233.0	$	4,221.4	$	248,136.7	$	2,967.5	$	2,963.2

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

The following table shows the location and amount of gains and losses recorded in the consolidated statement of income for the three and nine months ended September 30, 2014, and 2013.

	Location of Derivative Gain/(Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
		Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)		2014		2013		2014		2013
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	46.4	$	62.8	$	149.4	$	193.6
Interest Rate Contracts	Security Commissions and Trading Income		0.6		4.4		4.6		11.4
Total		$	47.0	$	67.2	$	154.0	$	205.0

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.

			September 30, 2014						December 31, 2013
(In Millions)	Derivative Instrument	Risk Classification	Notional Value		Fair Value				Notional Value		Fair Value
					Asset		Liability				Asset		Liability
Fair Value Hedges
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate	$	2,939.7	$	20.8	$	24.9	$	3,296.9	$	31.5	$	44.8
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Rate		1,250.0		92.4		2.0		1,250.0		83.6		33.4
Cash Flow Hedges
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		341.0		5.2		9.5		314.0		10.2		5.5
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate		10.0		—		—		—		—		—
Available for Sale Investment Securities	Interest Rate Option Contracts	Interest Rate		375.0		0.1		0.7		—		—		—
Net Investment Hedges
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		1,753.6		65.5		3.1		1,684.9		9.8		52.8
Total			$	6,669.3	$	184.0	$	40.2	$	6,545.8	$	135.1	$	136.5

Gains/Losses of Derivative Financial Instruments

The following table shows the location and amount of derivative gains and losses recorded in the consolidated statement of income related to fair value hedges for the three and nine months ended September 30, 2014, and 2013.

(In Millions)	Derivative Instrument	Location of Derivative Gain/(Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
			Three Months Ended September 30,					Nine Months Ended September 30,
			2014		2013			2014			2013
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Income	$	5.1	$	(16.4	)	$	(21.9	)	$	21.6
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Expense		5.8		(3.6	)		66.0			(16.1	)
Total			$	10.9	$	(20.0	)	$	44.1		$	5.5

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 nine months ended September 30, 2014, and 2013.

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)				Interest Rate Option Contracts (Before Tax)
Three Months Ended September 30,	2014			2013			2014		2013		2014			2013
Net Gain/(Loss) Recognized in AOCI	$	(6.9	)	$	5.3		$	—	$	—	$	(0.7	)	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Other Operating Income		0.7			—			—		—		—			—
Interest Income		—			—			—		—		0.1			—
Other Operating Expense		—			(1.1	)		—		—		—			—
Total	$	0.7		$	(1.1	)	$	—	$	—	$	0.1		$	—

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)				Interest Rate Option Contracts (Before Tax)
Nine Months Ended September 30,	2014			2013			2014		2013		2014			2013
Net Gain/(Loss) Recognized in AOCI	$	(5.8	)	$	(4.0	)	$	—	$	—	$	(0.7	)	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Other Operating Income		3.4			(1.8	)		—		—		—			—
Interest Income		—			—			—		—		0.1			—
Other Operating Expense		(0.2	)		(3.9	)		—		—		—			—
Total	$	3.2		$	(5.7	)	$	—	$	—	$	0.1		$	—

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 nine months ended September 30, 2014, and 2013.

	Hedging Gain/(Loss) Recognized in OCI (Before Tax)
	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	2014		2013			2014		2013
Foreign Exchange Contracts	$	106.2	$	(73.8	)	$	74.3	$	(9.5	)
Sterling Denominated Subordinated Debt		13.7		(15.0	)		5.4		0.2
Total	$	119.9	$	(88.8	)	$	79.7	$	(9.3	)

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.

(In Millions)	September 30, 2014						December 31, 2013
	Notional Value		Fair Value				Notional Value		Fair Value
			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	192.3	$	0.3	$	3.5	$	168.8	$	1.0	$	1.2

Gains/Losses of Derivative Financial Instruments

The following table provides the location and amount of gains and losses recorded in the consolidated statement of income for the three and nine months ended September 30, 2014, and 2013.

(In Millions)	Location of Derivative Gain/ (Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
		Three Months Ended September 30,					Nine Months Ended September 30,
		2014			2013		2014			2013
Credit Default Swap Contracts	Other Operating Income	$	—		$	—	$	—		$	(0.1	)
Foreign Exchange Contracts	Other Operating Income		(10.1	)		6.7		(9.3	)		(4.3	)
Total		$	(10.1	)	$	6.7	$	(9.3	)	$	(4.4	)

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Remaining Maturity of Securities Available for Sale (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Available for Sale - Cost
Due in One Year or Less	$ 7,195.0
Due After One Year Through Five Years	16,637.9
Due After Five Years Through Ten Years	3,116.8
Due After Ten Years	1,096.5
Total	28,046.2
Held to Maturity - Amortized Cost
Due in One Year or Less	1,914.1
Due After One Year Through Five Years	2,222.2
Due After Five Years Through Ten Years	23.3
Due After Ten Years	37.1
Amortized Cost	4,196.7	2,325.8
Available for Sale - Value
Due in One Year or Less	7,210.6
Due After One Year Through Five Years	16,677.9
Due After Five Years Through Ten Years	3,138.1
Due After Ten Years	1,081.1
Total	28,107.7
Held to Maturity - Fair Value
Due in One Year or Less	1,915.3
Due After One Year Through Five Years	2,230.5
Due After Five Years Through Ten Years	24.1
Due After Ten Years	25.2
Total	$ 4,195.1	$ 2,321.4

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Earnings Contribution of Northern Trust's Business Units (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Segment Reporting Information [Line Items]
Trust, Investment and Other Servicing Fees	$ 718.2		$ 648.0		$ 2,104.6		$ 1,936.0
Foreign Exchange Trading Income	46.4		62.8		149.4		193.6
Other Noninterest Income	65.0		99.4		205.5		231.3
Net Interest Income	256.2	[1]	244.8	[1]	764.0	[2]	706.5	[2]
Revenue	1,085.8	[1]	1,055.0	[1]	3,223.5	[2]	3,067.4	[2]
Provision for Credit Losses			5.0		3.0		15.0
Noninterest Expense	774.7		740.7		2,353.7		2,199.3
Income (loss) before Income Taxes	311.1	[1]	309.3	[1]	866.8	[2]	853.1	[2]
Provision (Benefit) for Income Taxes	106.6	[1]	102.8	[1]	299.0	[2]	291.5	[2]
Net Income	204.5		206.5		567.8		561.6
Percentage of Consolidated Net Income	100.00%		100.00%		100.00%		100.00%
Average Assets	105,244.7		95,212.5		102,955.8		93,223.5
Corporate & Institutional Services
Segment Reporting Information [Line Items]
Trust, Investment and Other Servicing Fees	399.9		359.8		1,174.5		1,072.7
Foreign Exchange Trading Income	44.4		61.8		143.2		189.8
Other Noninterest Income	42.8		44.3		134.3		130.1
Net Interest Income	78.4	[1]	70.1	[1]	228.8	[2]	200.2	[2]
Revenue	565.5	[1]	536.0	[1]	1,680.8	[2]	1,592.8	[2]
Provision for Credit Losses	0.9		0.4		4.5		(1.1)
Noninterest Expense	429.6		412.0		1,299.5		1,206.7
Income (loss) before Income Taxes	135.0	[1]	123.6	[1]	376.8	[2]	387.2	[2]
Provision (Benefit) for Income Taxes	42.4	[1]	38.8	[1]	113.3	[2]	123.0	[2]
Net Income	92.6		84.8		263.5		264.2
Percentage of Consolidated Net Income	45.00%		41.00%		46.00%		47.00%
Average Assets	59,907.1		53,653.5		59,061.3		52,323.8
Wealth Management
Segment Reporting Information [Line Items]
Trust, Investment and Other Servicing Fees	318.3		288.2		930.1		863.3
Foreign Exchange Trading Income	2.0		1.0		6.2		3.8
Other Noninterest Income	20.9		54.3		66.7		95.8
Net Interest Income	131.2	[1]	136.3	[1]	398.8	[2]	425.3	[2]
Revenue	472.4	[1]	479.8	[1]	1,401.8	[2]	1,388.2	[2]
Provision for Credit Losses	(0.9)		4.6		(1.5)		16.1
Noninterest Expense	312.1		297.3		960.3		900.9
Income (loss) before Income Taxes	161.2	[1]	177.9	[1]	443.0	[2]	471.2	[2]
Provision (Benefit) for Income Taxes	60.7	[1]	67.0	[1]	166.9	[2]	177.8	[2]
Net Income	100.5		110.9		276.1		293.4
Percentage of Consolidated Net Income	49.00%		54.00%		49.00%		52.00%
Average Assets	26,061.8		22,923.6		23,613.4		22,863.1
Treasury and Other
Segment Reporting Information [Line Items]
Other Noninterest Income	1.3		0.8		4.5		5.4
Net Interest Income	46.6	[1]	38.4	[1]	136.4	[2]	81.0	[2]
Revenue	47.9	[1]	39.2	[1]	140.9	[2]	86.4	[2]
Noninterest Expense	33.0		31.4		93.9		91.7
Income (loss) before Income Taxes	14.9	[1]	7.8	[1]	47.0	[2]	(5.3)	[2]
Provision (Benefit) for Income Taxes	3.5	[1]	(3.0)	[1]	18.8	[2]	(9.3)	[2]
Net Income	11.4		10.8		28.2		4.0
Percentage of Consolidated Net Income	6.00%		5.00%		5.00%		1.00%
Average Assets	$ 19,275.8		$ 18,635.4		$ 20,281.1		$ 18,036.6

[1] Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $6.9 million for 2014 and $7.8 million for 2013.

[2] Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $22.4 million for 2014 and $23.3 million for 2013.

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Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets
Cash and Due from Banks	$ 2,918.9	$ 3,162.4
Federal Funds Sold and Securities Purchased under Agreements to Resell	1,010.0	529.6
Interest-Bearing Deposits with Banks	15,334.5	19,397.4
Federal Reserve Deposits	21,328.0	12,911.5
Securities
Available for Sale	28,107.7	28,392.8
Held to Maturity (Fair value of $4,195.1 and $2,321.4)	4,196.7	2,325.8
Trading Account	4.3	1.7
Total Securities	32,308.7	30,720.3
Loans and Leases
Commercial	13,868.6	12,620.0
Personal	16,851.3	16,765.5
Total Loans and Leases	30,719.9	29,385.5
Allowance for Credit Losses Assigned to Loans and Leases	(269.4)	(278.1)
Buildings and Equipment	436.6	458.8
Client Security Settlement Receivables	1,538.6	1,355.2
Goodwill	538.1	540.7
Other Assets	5,289.8	4,764.0
Total Assets	111,153.7	102,947.3
Deposits
Demand and Other Noninterest-Bearing	21,609.6	16,888.7
Savings and Money Market	14,525.1	14,991.5
Savings Certificates and Other Time	1,869.0	1,874.4
Non U.S. Offices - Noninterest-Bearing	3,132.7	1,881.8
- Interest-Bearing	50,586.1	48,461.7
Total Deposits	91,722.5	84,098.1
Federal Funds Purchased	786.4	965.1
Securities Sold under Agreements to Repurchase	866.8	917.3
Other Borrowings	1,758.3	1,558.6
Senior Notes	1,496.9	1,996.6
Long-Term Debt	1,598.7	1,709.2
Floating Rate Capital Debt	277.2	277.1
Other Liabilities	4,104.3	3,513.3
Total Liabilities	102,611.1	95,035.3
Stockholders' Equity
Preferred Stock, No Par Value; Authorized 10,000,000 shares: Series C, outstanding shares of 16,000 and 0	388.5
Common Stock, $1.66 2/3 Par Value; Authorized 560,000,000 shares; Outstanding shares of 235,505,008 and 237,322,035	408.6	408.6
Additional Paid-In Capital	1,055.5	1,035.7
Retained Earnings	7,469.4	7,134.8
Accumulated Other Comprehensive Loss	(218.4)	(244.3)
Treasury Stock (9,666,516 and 7,849,489 shares, at cost)	(561.0)	(422.8)
Total Stockholders' Equity	8,542.6	7,912.0
Total Liabilities and Stockholders' Equity	$ 111,153.7	$ 102,947.3

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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, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
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	$ 601.3	$ 767.7
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	$ 207.4	$ 210.7

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Offsetting of Derivative Liabilities and of Securities Sold Under Agreements to Repurchase Within Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Derivative [Line Items]
Net Amounts Presented	$ 866.8		$ 917.3
Securities Sold under Agreements to Repurchase
Derivative [Line Items]
Gross Recognized Liabilities	866.8		917.3
Net Amounts Presented	866.8		917.3
Gross Amounts Not Offset	866.8		917.3
Derivatives
Derivative [Line Items]
Gross Recognized Liabilities	4,265.1	[1]	3,100.9	[1]
Gross Amounts Offset	2,752.3	[1]	1,926.0	[1]
Net Amounts Presented	1,512.8	[1]	1,174.9	[1]
Net Amount	1,512.8	[1],[2]	1,174.9	[1],[2]
Derivatives | Subject to Master Netting Arrangement
Derivative [Line Items]
Gross Recognized Liabilities	3,527.8	[1]	2,234.2	[1]
Gross Amounts Offset	2,752.3	[1]	1,926.0	[1]
Net Amounts Presented	775.5	[1]	308.2	[1]
Net Amount	775.5	[1],[2]	308.2	[1],[2]
Derivatives | Not Subject to Master Netting Arrangement
Derivative [Line Items]
Gross Recognized Liabilities	737.3	[1]	866.7	[1]
Net Amounts Presented	737.3	[1]	866.7	[1]
Net Amount	737.3	[1],[2]	866.7	[1],[2]
Derivatives | Foreign Exchange Contracts | Over the Counter Derivative
Derivative [Line Items]
Gross Recognized Liabilities	3,404.3	[1]	2,039.0	[1]
Gross Amounts Offset	2,085.0	[1]	1,073.3	[1]
Net Amounts Presented	1,319.3	[1]	965.7	[1]
Net Amount	1,319.3	[1],[2]	965.7	[1],[2]
Derivatives | Interest Rate Swap Contracts | Over the Counter Derivative
Derivative [Line Items]
Gross Recognized Liabilities	116.1	[1]	163.7	[1]
Gross Amounts Offset	31.5	[1]	47.5	[1]
Net Amounts Presented	84.6	[1]	116.2	[1]
Net Amount	84.6	[1],[2]	116.2	[1],[2]
Derivatives | Interest Rate Swap Contracts | Exchange Cleared
Derivative [Line Items]
Gross Recognized Liabilities	7.4	[1]	31.5	[1]
Gross Amounts Offset	7.4	[1]	9.1	[1]
Net Amounts Presented			22.4	[1]
Net Amount			22.4	[1],[2]
Derivatives | Cross Product Netting Adjustment
Derivative [Line Items]
Gross Amounts Offset	27.1	[1]	28.4	[1]
Derivatives | Cross Product Collateral Adjustment
Derivative [Line Items]
Gross Amounts Offset	$ 601.3	[1]	$ 767.7	[1]

[1] Derivative liabilities are reported in other liabilities in the consolidated balance sheet. Other liabilities (excluding derivative liabilities) totaled $2,591.5 million and $2,338.4 million as of September 30, 2014, and December 31, 2013, respectively.

[2] Northern Trust did not place any cash collateral with counterparties that was not offset in the consolidated balance sheet that could have been used to offset the net amounts presented in the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

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Consolidated Statement of Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Changes in Other-Than-Temporary-Impairment (OTTI) Losses					$ (4.6)	[1]
Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI					0.7	[2]
Other Security Gains (Losses), net	0.3		(2.2)		0.6		(1.9)
Investment Security Gains (Losses), net	$ 0.3	[3]	$ (2.2)	[3]	$ (3.3)	[3]	$ (1.9)	[3]

[1] For initial other-than-temporary impairments in the respective 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 other-than-temporary impairments in the respective period, the balance includes the portion of the excess of amortized cost over the fair value of the impaired securities that was recorded in 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 0.3 (2.2 ) 0.6 (1.9 ) Investment Security Gains (Losses), net $ 0.3 $ (2.2 ) $ (3.3 ) $ (1.9 )

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Offsetting of Derivative Assets and of Securities Purchased Under Agreements to Resell Within Consolidated Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Securities Purchased under Agreements to Resell
Derivative [Line Items]
Gross Recognized Assets	$ 1,000.0	[1]	$ 500.0	[1]
Net Amount Presented	1,000.0	[1]	500.0	[1]
Gross Amounts Not Offset	1,000.0	[1]	500.0	[1]
Derivatives
Derivative [Line Items]
Gross Recognized Assets	4,417.3	[2]	3,103.6	[2]
Gross Amounts Offset	2,358.4	[2]	1,369.0	[2]
Net Amount Presented	2,058.9	[2]	1,734.6	[2]
Net Amount	2,058.9	[2],[3]	1,734.6	[2],[3]
Derivatives | Subject to Master Netting Arrangement
Derivative [Line Items]
Gross Recognized Assets	3,478.5	[2]	2,850.4	[2]
Gross Amounts Offset	2,358.4	[2]	1,369.0	[2]
Net Amount Presented	1,120.1	[2]	1,481.4	[2]
Net Amount	1,120.1	[2],[3]	1,481.4	[2],[3]
Derivatives | Not Subject to Master Netting Arrangement
Derivative [Line Items]
Gross Recognized Assets	938.8	[2]	253.2	[2]
Net Amount Presented	938.8	[2]	253.2	[2]
Net Amount	938.8	[2],[3]	253.2	[2],[3]
Derivatives | Foreign Exchange Contracts | Over the Counter Derivative
Derivative [Line Items]
Gross Recognized Assets	3,265.0	[2]	2,612.5	[2]
Gross Amounts Offset	2,085.0	[2]	1,073.3	[2]
Net Amount Presented	1,180.0	[2]	1,539.2	[2]
Net Amount	1,180.0	[2],[3]	1,539.2	[2],[3]
Derivatives | Interest Rate Swap Contracts | Over the Counter Derivative
Derivative [Line Items]
Gross Recognized Assets	183.7	[2]	228.8	[2]
Gross Amounts Offset	31.5	[2]	47.5	[2]
Net Amount Presented	152.2	[2]	181.3	[2]
Net Amount	152.2	[2],[3]	181.3	[2],[3]
Derivatives | Interest Rate Swap Contracts | Exchange Cleared
Derivative [Line Items]
Gross Recognized Assets	29.8	[2]	9.1	[2]
Gross Amounts Offset	7.4	[2]	9.1	[2]
Net Amount Presented	22.4	[2]
Net Amount	22.4	[2],[3]
Derivatives | Cross Product Netting Adjustment
Derivative [Line Items]
Gross Amounts Offset	27.1	[2]	28.4	[2]
Derivatives | Cross Product Collateral Adjustment
Derivative [Line Items]
Gross Amounts Offset	$ 207.4	[2]	$ 210.7	[2]

[1] Securities purchased under agreements to resell are reported in federal funds sold and securities purchased under agreements to resell in the consolidated balance sheet. Federal funds sold totaled $10.0 million and $29.6 million as of September 30, 2014, and December 31, 2013, respectively.

[2] Derivative assets are reported in other assets in the consolidated balance sheet. Other assets (excluding derivative assets) totaled $3,230.9 million and $3,029.4 million as of September 30, 2014, and December 31, 2013, respectively.

[3] Northern Trust did not possess any cash collateral that was not offset in the consolidated balance sheet that could have been used to offset the net amounts presented in the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

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Amounts Outstanding for Loans and Leases by Segment and Class (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 30,719.9	$ 29,385.5
Allowance for Credit Losses Assigned to Loans and Leases	(269.4)	(278.1)
Net Loans and Leases	30,450.5	29,107.4
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and Institutional	8,212.1	7,375.8
Commercial Real Estate	3,107.7	2,955.8
Lease Financing, net	952.5	975.1
Non-U.S.	1,408.4	954.7
Other	187.9	358.6
Total Loans and Leases	13,868.6	12,620.0
Allowance for Credit Losses Assigned to Loans and Leases	(143.1)	(140.9)
Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential Real Estate	9,872.7	10,271.3
Private Client	6,953.1	6,445.6
Other	25.5	48.6
Total Loans and Leases	16,851.3	16,765.5
Allowance for Credit Losses Assigned to Loans and Leases	$ (126.3)	$ (137.2)

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Accumulated Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2014

Components of Accumulated Other Comprehensive Income (Loss)

The following tables summarize the components of accumulated other comprehensive income (loss) at September 30, 2014, and 2013, and changes during the three and nine month periods then ended.

(In Millions)	Balance at December 31, 2013			Net Change			Balance at September 30, 2014
Net Unrealized Gains (Losses) on Securities Available for Sale	$	6.0		$	32.3		$	38.3
Net Unrealized Gains (Losses) on Cash Flow Hedges		2.9			(6.4	)		(3.5	)
Net Foreign Currency Adjustments		7.1			(10.5	)		(3.4	)
Net Pension and Other Postretirement Benefit Adjustments		(260.3	)		10.5			(249.8	)
Total	$	(244.3	)	$	25.9		$	(218.4	)

(In Millions)	Balance at December 31, 2012			Net Change			Balance at September 30, 2013
Net Unrealized Gains (Losses) on Securities Available for Sale	$	101.0		$	(74.4	)	$	26.6
Net Unrealized Gains (Losses) on Cash Flow Hedges		(1.4	)		1.2			(0.2	)
Net Foreign Currency Adjustments		10.5			(2.8	)		7.7
Net Pension and Other Postretirement Benefit Adjustments		(393.1	)		21.1			(372.0	)
Total	$	(283.0	)	$	(54.9	)	$	(337.9	)

Components of Changes in Accumulated Other Comprehensive Income (Loss)

	Three Months Ended September 30,
	2014									2013
(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 Gains (Losses) on Securities OTTI	$	5.5		$	(2.1	)	$	3.4		$	—		$	—		$	—
Other Unrealized Gains (Losses) on Securities Available for Sale		(14.2	)		5.4			(8.8	)		7.3			(2.8	)		4.5
Reclassification Adjustment for (Gains) Losses Included in Net Income		(0.3	)		—			(0.3	)		2.1			(0.8	)		1.3
Net Change		(9.0	)		3.3			(5.7	)		9.4			(3.6	)		5.8
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		(7.6	)		2.5			(5.1	)		5.3			(1.7	)		3.6
Reclassification Adjustment for (Gains) Losses Included in Net Income		(3.7	)		1.4			(2.3	)		1.1			(0.4	)		0.7
Net Change		(11.3	)		3.9			(7.4	)		6.4			(2.1	)		4.3
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		(77.1	)		6.6			(70.5	)		55.0			(4.0	)		51.0
Long-Term Intra-Entity Foreign Currency Transaction Losses		(7.4	)		—			(7.4	)		—			—			—
Net Investment Hedge Gains (Losses)		119.9			(45.6	)		74.3			(88.8	)		33.4			(55.4	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		35.4			(39.0	)		(3.6	)		(33.8	)		29.4			(4.4	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		6.5			(3.0	)		3.5			11.3			(4.2	)		7.1
Net Change	$	6.5		$	(3.0	)	$	3.5		$	11.3		$	(4.2	)	$	7.1

	Nine Months Ended September 30,
	2014									2013
(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 Gains (Losses) on Securities OTTI	$	3.7		$	(1.4	)	$	2.3		$	2.1		$	(0.8	)	$	1.3
Other Unrealized Gains (Losses) on Securities Available for Sale		48.8			(18.2	)		30.6			(123.2	)		46.3			(76.9	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		(0.6	)		—			(0.6	)		1.9			(0.7	)		1.2
Net Change		51.9			(19.6	)		32.3			(119.2	)		44.8			(74.4	)
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		(6.5	)		2.2			(4.3	)		(4.0	)		1.6			(2.4	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		(3.3	)		1.2			(2.1	)		5.7			(2.1	)		3.6
Net Change		(9.8	)		3.4			(6.4	)		1.7			(0.5	)		1.2
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		(57.2	)		6.0			(51.2	)		5.3			(2.3	)		3.0
Long-Term Intra-Entity Foreign Currency Transaction Losses		(9.0	)		—			(9.0	)		—			—			—
Net Investment Hedge Gains (Losses)		79.7			(30.0	)		49.7			(9.3	)		3.5			(5.8	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		13.5			(24.0	)		(10.5	)		(4.0	)		1.2			(2.8	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		19.0			(8.5	)		10.5			33.7			(12.6	)		21.1
Net Change	$	19.0		$	(8.5	)	$	10.5		$	33.7		$	(12.6	)	$	21.1

Reclassification Out of Accumulated Other Comprehensive Income (Loss)

The following table provides the location and before-tax amounts of reclassifications out of accumulated other comprehensive income (loss) during the three and nine months ended September 30, 2014.

(In Millions)	Location of Reclassification Adjustments Recognized in Income	Amount of Reclassification Adjustments Recognized in Income
		Three Months Ended			Nine Months Ended
		September 30, 2014
Securities Available for Sale
Realized (Gains) Losses on Securities Available for Sale	Investment Security Gains (Losses), net	$	(0.3	)	$	(0.6	)
Realized (Gains) Losses on Cash Flow Hedges
Foreign Exchange Contracts	Other Operating Income/Expense		(3.7	)		(3.3	)
Pension and Other Postretirement Benefit Adjustments
Amortization of Net Actuarial (Gain) Loss	Employee Benefits		(0.3	)		(1.1	)
Amortization of Prior Service Cost	Employee Benefits		6.8			20.1
Gross Reclassification Adjustment		$	6.5		$	19.0

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Changes in Allowance for Credit Losses by Segment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at Beginning of Period	$ 303.5	$ 320.7	$ 307.9	$ 327.6
Charge-Offs	(8.6)	(11.6)	(27.9)	(39.8)
Recoveries	3.4	3.3	15.3	14.7
Net (Charge-Offs) Recoveries	(5.2)	(8.3)	(12.6)	(25.1)
Provision for Credit Losses		5.0	3.0	15.0
Effect of Foreign Exchange Rates		0.1
Balance at End of Period	298.3	317.5	298.3	317.5
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at Beginning of Period	168.7	184.1	168.0	194.2
Charge-Offs	(2.5)	(1.7)	(8.8)	(6.9)
Recoveries	1.9	1.7	10.7	8.1
Net (Charge-Offs) Recoveries	(0.6)		1.9	1.2
Provision for Credit Losses	1.0	(4.6)	(0.8)	(15.8)
Effect of Foreign Exchange Rates		0.1
Balance at End of Period	169.1	179.6	169.1	179.6
Personal
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at Beginning of Period	134.8	136.6	139.9	133.4
Charge-Offs	(6.1)	(9.9)	(19.1)	(32.9)
Recoveries	1.5	1.6	4.6	6.6
Net (Charge-Offs) Recoveries	(4.6)	(8.3)	(14.5)	(26.3)
Provision for Credit Losses	(1.0)	9.6	3.8	30.8
Balance at End of Period	$ 129.2	$ 137.9	$ 129.2	$ 137.9

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Income Taxes

9 Months Ended

Sep. 30, 2014

Income Taxes

14. Income Taxes – Income tax expense for the three and nine months ended September 30, 2014, of $99.7 million and $276.6 million, respectively, was recorded, each representing an effective tax rate of 32.8%. The prior year three and nine month provisions for income taxes were $95.0 million and $268.2 million, representing effective tax rates of 31.5% and 32.3%, respectively.

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Net Income Per Common Share Computations (Tables)

9 Months Ended

Sep. 30, 2014

Computations of Net Income per Common Share

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

	Three Months Ended September 30,				Nine Months Ended September 30,
($ In Millions Except Per Common Share Information)	2014		2013		2014		2013
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding		235,701,076		239,930,074		236,301,789		239,614,868
Net Income	$	204.5	$	206.5	$	567.8	$	561.6
Less: Dividends on Preferred Stock		—		—		—		—
Net Income Applicable to Common Stock		204.5		206.5		567.8		561.6
Less: Earnings Allocated to Participating Securities		3.5		3.5		9.5		9.1
Earnings Allocated to Common Shares Outstanding		201.0		203.0		558.3		552.5
Basic Net Income Per Common Share	$	0.85	$	0.85	$	2.36	$	2.31
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding		235,701,076		239,930,074		236,301,789		239,614,868
Plus: Dilutive Effect of Share-based Compensation		2,036,053		1,400,578		1,873,907		1,242,829
Average Common and Potential Common Shares		237,737,129		241,330,652		238,175,696		240,857,697
Earnings Allocated to Common and Potential
Common Shares	$	201.0	$	203.0	$	558.4	$	552.5
Diluted Net Income Per Common Share		0.84		0.84		2.34		2.29

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Share-Based Compensation Plans

9 Months Ended

Sep. 30, 2014

Share-Based Compensation Plans

16. 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 nine months ended September 30, 2014, and 2013.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014		2013
Restricted Stock Unit Awards	$	12.7	$	12.1	$	41.7	$	36.4
Stock Options		2.2		3.7		10.7		14.9
Performance Stock Units		3.1		2.1		8.9		5.4
Total Share-Based Compensation Expense		18.0		17.9		61.3		56.7
Tax Benefits Recognized	$	6.8	$	6.8	$	23.0	$	21.3

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Carrying Amounts of Goodwill (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Goodwill [Line Items]
Total Goodwill	$ 538.1	$ 540.7
Corporate & Institutional Services
Goodwill [Line Items]
Total Goodwill	466.6	469.2
Wealth Management
Goodwill [Line Items]
Total Goodwill	$ 71.5	$ 71.5

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Consolidated Statement 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, 2012			$ 408.6	$ 1,012.7	$ 6,702.7	$ (283.0)	$ (314.0)
Net Unrealized Gains (Losses) on Securities Available for Sale	(74.4)					(74.4)
Stock Options and Awards				(41.2)			175.6
Net Income	561.6				561.6
Net Unrealized Gains (Losses) on Cash Flow Hedges	1.2					1.2
Stock Options and Awards - Amortization				57.4
Dividends Declared - Common Stock					(224.2)
Stock Purchased							(187.1)
Foreign Currency Translation Adjustments	(2.8)					(2.8)
Stock Options and Awards - Tax Benefits				2.9
Pension and Other Postretirement Benefit Adjustments	21.1					21.1
Balance at Sep. 30, 2013	7,817.1		408.6	1,031.8	7,040.1	(337.9)	(325.5)
Balance at Dec. 31, 2013	7,912.0		408.6	1,035.7	7,134.8	(244.3)	(422.8)
Net Unrealized Gains (Losses) on Securities Available for Sale	32.3					32.3
Stock Options and Awards				(55.0)			177.0
Net Income	567.8				567.8
Issuance of Preferred Stock, Series C		388.5
Net Unrealized Gains (Losses) on Cash Flow Hedges	(6.4)					(6.4)
Stock Options and Awards - Amortization				60.4
Dividends Declared - Common Stock					(233.2)
Stock Purchased							(315.2)
Foreign Currency Translation Adjustments	(10.5)					(10.5)
Stock Options and Awards - Tax Benefits				14.4
Pension and Other Postretirement Benefit Adjustments	10.5					10.5
Balance at Sep. 30, 2014	$ 8,542.6	$ 388.5	$ 408.6	$ 1,055.5	$ 7,469.4	$ (218.4)	$ (561.0)

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Consolidated Balance Sheet (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Held to Maturity, Fair value	$ 4,195.1	$ 2,321.4
Total Loans and Leases, unearned income	$ 299.2	$ 286.2
Preferred Stock, Par Value
Preferred Stock, Authorized	10,000,000
Preferred Stock, Outstanding	16,000
Common Stock, Par Value	$ 1.6667	$ 1.6667
Common Stock, Authorized	560,000,000	560,000,000
Common Stock, Outstanding	235,505,008	237,322,035
Treasury Stock, shares	9,666,516	7,849,489

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Issuance of Preferred Stock

9 Months Ended

Sep. 30, 2014

Issuance of Preferred Stock

9. Issuance of Preferred Stock — Northern Trust is authorized to issue 10 million shares of preferred stock, without par value.

On August 5, 2014, Northern Trust issued 16 million depositary shares, each representing 1/1000 ownership interest in a share of Northern Trust’s Series C Non-Cumulative Perpetual Preferred Stock (“Series C Preferred Stock”), without par value, with a liquidation preference of $25,000 ($25 per depositary share). The aggregate proceeds from the public offering of the depositary shares, net of underwriting discounts, commissions and offering expenses, were $388.5 million.

Dividends on the Series C Preferred Stock, which are not mandatory, will accrue and be payable on the liquidation preference amount, on a non-cumulative basis, quarterly in arrears on the first day of January, April, July and October of each year, commencing on January 1, 2015, at a rate per annum equal to 5.85%. On October 21, 2014, Northern Trust declared a cash dividend of $593.125 per share of Series C Preferred Stock payable on January 1, 2015 to stockholders of record on December 15, 2014.

The Series C Preferred Stock has no maturity date. Shares of the Series C Preferred Stock rank senior to Northern Trust’s common stock, and will rank at least equally with any other series of preferred stock we may issue (except for any senior series that may be issued with the requisite consent of the holders of the Series C Preferred Stock) and all other parity stock, with respect to the payment of dividends and distributions upon liquidation, dissolution or winding up.

The Series C Preferred Stock is redeemable at Northern Trust’s option, in whole or in part, on any dividend payment date on or after October 1, 2019. The Series C Preferred stock is redeemable at the Company’s option, in whole, but not in part, prior to October 1, 2019 within 90 days of a regulatory capital treatment event, as described in the Series C Preferred Stock Certificate of Designation.

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Gains and Losses Recorded in Consolidated Statement of Income related to Derivative Instruments Not Formally Designated as Hedges (Detail) (Nondesignated, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ (10.1)	$ 6.7	$ (9.3)	$ (4.4)
Credit Default Swap Contracts | Others Operating Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income				(0.1)
Foreign Exchange Contracts | Others Operating Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ (10.1)	$ 6.7	$ (9.3)	$ (4.3)

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Net Investment Hedge Gains and Losses Recognized in AOCI (Detail) (Net Investment Hedges, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative [Line Items]
Hedging Instrument Gain/(Loss) Recognized in AOCI (Before Tax)	$ 119.9	$ (88.8)	$ 79.7	$ (9.3)
Foreign Exchange Contracts
Derivative [Line Items]
Hedging Instrument Gain/(Loss) Recognized in AOCI (Before Tax)	106.2	(73.8)	74.3	(9.5)
Sterling Denominated Subordinated Debt
Derivative [Line Items]
Hedging Instrument Gain/(Loss) Recognized in AOCI (Before Tax)	$ 13.7	$ (15.0)	$ 5.4	$ 0.2

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Document and Entity Information	9 Months Ended
	Sep. 30, 2014
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q3
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	235,505,008

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Business Units

9 Months Ended

Sep. 30, 2014

Business Units

10. Business Units — The following tables show the earnings contributions of Northern Trust’s business units for the three and nine month periods ended September 30, 2014, and 2013.

Three Months Ended September 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2014			2013			2014			2013			2014			2013			2014			2013
Noninterest Income
Trust, Investment and Other Servicing Fees	$	399.9		$	359.8		$	318.3		$	288.2		$	—		$	—		$	718.2		$	648.0
Foreign Exchange Trading Income		44.4			61.8			2.0			1.0			—			—			46.4			62.8
Other Noninterest Income		42.8			44.3			20.9			54.3			1.3			0.8			65.0			99.4
Net Interest Income*		78.4			70.1			131.2			136.3			46.6			38.4			256.2			244.8
Revenue*		565.5			536.0			472.4			479.8			47.9			39.2			1,085.8			1,055.0
Provision for Credit Losses		0.9			0.4			(0.9	)		4.6			—			—			—			5.0
Noninterest Expense		429.6			412.0			312.1			297.3			33.0			31.4			774.7			740.7
Income before Income Taxes*		135.0			123.6			161.2			177.9			14.9			7.8			311.1			309.3
Provision (Benefit) for Income Taxes*		42.4			38.8			60.7			67.0			3.5			(3.0	)		106.6			102.8
Net Income	$	92.6		$	84.8		$	100.5		$	110.9		$	11.4		$	10.8		$	204.5		$	206.5
Percentage of Consolidated Net Income		45	%		41	%		49	%		54	%		6	%		5	%		100	%		100	%
Average Assets	$	59,907.1		$	53,653.5		$	26,061.8		$	22,923.6		$	19,275.8		$	18,635.4		$	105,244.7		$	95,212.5

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $6.9 million for 2014 and $7.8 million for 2013.

Nine Months Ended September 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2014			2013			2014			2013			2014			2013			2014			2013
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,174.5		$	1,072.7		$	930.1		$	863.3		$	—		$	—		$	2,104.6		$	1,936.0
Foreign Exchange Trading Income		143.2			189.8			6.2			3.8			—			—			149.4			193.6
Other Noninterest Income		134.3			130.1			66.7			95.8			4.5			5.4			205.5			231.3
Net Interest Income*		228.8			200.2			398.8			425.3			136.4			81.0			764.0			706.5
Revenue*		1,680.8			1,592.8			1,401.8			1,388.2			140.9			86.4			3,223.5			3,067.4
Provision for Credit Losses		4.5			(1.1	)		(1.5	)		16.1			—			—			3.0			15.0
Noninterest Expense		1,299.5			1,206.7			960.3			900.9			93.9			91.7			2,353.7			2,199.3
Income (loss) before Income Taxes*		376.8			387.2			443.0			471.2			47.0			(5.3	)		866.8			853.1
Provision (Benefit) for Income Taxes*		113.3			123.0			166.9			177.8			18.8			(9.3	)		299.0			291.5
Net Income	$	263.5		$	264.2		$	276.1		$	293.4		$	28.2		$	4.0		$	567.8		$	561.6
Percentage of Consolidated Net Income		46	%		47	%		49	%		52	%		5	%		1	%		100	%		100	%
Average Assets	$	59,061.3		$	52,323.8		$	23,613.4		$	22,863.1		$	20,281.1		$	18,036.6		$	102,955.8		$	93,223.5

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $22.4 million for 2014 and $23.3 million for 2013.

Further discussion of business unit results is provided within the “Business Unit Reporting” section of Management’s Discussion and Analysis of Financial Condition and Results of Operations.

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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Taxes [Line Items]
Income tax expense	$ 99.7	$ 95.0	$ 276.6	$ 268.2
Effective tax rate	32.80%	31.50%	32.80%	32.30%

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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, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain/(Loss) Recognized in AOCI	$ (6.9)	$ 5.3	$ (5.8)	$ (4.0)
Net Gain/(Loss) Reclassified from AOCI to Earnings	0.7	(1.1)	3.2	(5.7)
Interest Rate Option Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain/(Loss) Recognized in AOCI	(0.7)		(0.7)
Net Gain/(Loss) Reclassified from AOCI to Earnings	0.1		0.1
Net Gain/(Loss) Reclassified from AOCI to Earnings | Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Other Operating Income	0.7		3.4	(1.8)
Other Operating Expense		$ (1.1)	$ (0.2)	$ (3.9)

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Consolidated Statement of Income (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 718.2		$ 648.0		$ 2,104.6		$ 1,936.0
Foreign Exchange Trading Income	46.4		62.8		149.4		193.6
Treasury Management Fees	16.4		17.6		49.8		51.5
Security Commissions and Trading Income	14.2		16.8		46.7		53.4
Other Operating Income	34.1		67.2		112.3		128.3
Investment Security Gains (Losses), net	0.3	[1]	(2.2)	[1]	(3.3)	[1]	(1.9)	[1]
Total Noninterest Income	829.6		810.2		2,459.5		2,360.9
Net Interest Income
Interest Income	293.8		291.1		883.0		853.1
Interest Expense	44.5		54.1		141.4		169.9
Net Interest Income	249.3		237.0		741.6		683.2
Provision for Credit Losses			5.0		3.0		15.0
Net Interest Income after Provision for Credit Losses	249.3		232.0		738.6		668.2
Noninterest Expense
Compensation	348.0		324.6		1,062.2		971.8
Employee Benefits	70.6		63.5		206.0		191.0
Outside Services	142.4		145.9		431.4		412.0
Equipment and Software	100.5		95.5		317.9		279.0
Occupancy	43.8		43.3		135.2		130.0
Other Operating Expense	69.4		67.9		201.0		215.5
Total Noninterest Expense	774.7		740.7		2,353.7		2,199.3
Income before Income Taxes	304.2		301.5		844.4		829.8
Provision for Income Taxes	99.7		95.0		276.6		268.2
Net Income	204.5		206.5		567.8		561.6
Net Income Applicable to Common Stock	$ 204.5		$ 206.5		$ 567.8		$ 561.6
Per Common Share
Net Income - Basic	$ 0.85		$ 0.85		$ 2.36		$ 2.31
Net Income - Diluted	$ 0.84		$ 0.84		$ 2.34		$ 2.29
Average Number of Common Shares Outstanding - Basic	235,701,076		239,930,074		236,301,789		239,614,868
Average Number of Common Shares Outstanding - Diluted	237,737,129		241,330,652		238,175,696		240,857,697

[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 0.3 (2.2 ) 0.6 (1.9 ) Investment Security Gains (Losses), net $ 0.3 $ (2.2 ) $ (3.3 ) $ (1.9 )

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Securities

9 Months Ended

Sep. 30, 2014

Securities

4. Securities — The following tables provide the amortized cost and fair values of securities at September 30, 2014, and December 31, 2013.

Securities Available for Sale	September 30, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	3,395.1	$	16.0	$	1.5	$	3,409.6
Obligations of States and Political Subdivisions		4.5		0.1		—		4.6
Government Sponsored Agency		16,114.2		85.4		25.2		16,174.4
Non-U.S. Government		309.3		1.2		—		310.5
Corporate Debt		3,393.5		4.7		33.4		3,364.8
Covered Bonds		1,966.9		12.2		0.2		1,978.9
Supranational and Non-U.S. Agency Bonds		360.0		1.4		1.2		360.2
Residential Mortgage-Backed		18.8		0.1		1.3		17.6
Other Asset-Backed		2,232.0		1.3		0.2		2,233.1
Auction Rate		83.4		2.3		0.5		85.2
Other		168.5		0.3		—		168.8
Total	$	28,046.2	$	125.0	$	63.5	$	28,107.7

Securities Held to Maturity	September 30, 2014
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	138.8	$	8.5	$	—	$	147.3
Government Sponsored Agency		22.8		1.1		—		23.9
Non-U.S. Government		1,094.1		3.7		0.7		1,097.1
Certificates of Deposit		1,479.5		0.2		0.1		1,479.6
Supranational and Non-U.S. Agency Bonds		1,393.9		3.9		1.9		1,395.9
Other		67.6		—		16.3		51.3
Total	$	4,196.7	$	17.4	$	19.0	$	4,195.1

Securities Available for Sale	December 31, 2013
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
U.S. Government	$	1,896.7	$	22.6	$	1.4	$	1,917.9
Obligations of States and Political Subdivisions		4.5		0.1		—		4.6
Government Sponsored Agency		17,495.2		80.7		47.9		17,528.0
Non-U.S. Government		307.0		3.6		—		310.6
Corporate Debt		3,615.2		10.5		101.2		3,524.5
Covered Bonds		1,898.9		50.9		5.9		1,943.9
Supranational and Non-U.S. Agency Bonds		410.0		1.7		1.7		410.0
Residential Mortgage-Backed		52.4		0.1		4.4		48.1
Other Asset-Backed		2,390.8		1.4		0.4		2,391.8
Auction Rate		97.5		2.2		0.8		98.9
Other		214.1		0.4		—		214.5
Total	$	28,382.3	$	174.2	$	163.7	$	28,392.8

Securities Held to Maturity	December 31, 2013
	Amortized Cost		Gross Unrealized				Fair Value
(In Millions)			Gains		Losses
Obligations of States and Political Subdivisions	$	225.2	$	10.3	$	—	$	235.5
Government Sponsored Agency		35.9		1.1		—		37.0
Non-U.S. Government		722.0		0.8		1.1		721.7
Certificates of Deposit		698.1		—		0.2		697.9
Supranational and Non-U.S. Agency Bonds		584.7		—		3.2		581.5
Other		59.9		0.1		12.2		47.8
Total	$	2,325.8	$	12.3	$	16.7	$	2,321.4

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 September 30, 2014.

Remaining Maturity of Securities
(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	7,195.0	$	7,210.6
Due After One Year Through Five Years		16,637.9		16,677.9
Due After Five Years Through Ten Years		3,116.8		3,138.1
Due After Ten Years		1,096.5		1,081.1
Total		28,046.2		28,107.7
Held to Maturity
Due in One Year or Less		1,914.1		1,915.3
Due After One Year Through Five Years		2,222.2		2,230.5
Due After Five Years Through Ten Years		23.3		24.1
Due After Ten Years		37.1		25.2
Total	$	4,196.7	$	4,195.1

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 gains of $0.3 million were recognized in the three months ended September 30, 2014, representing net realized gains from the sale of securities. Net investment security losses of $2.2 million were recognized in the three months ended September 30, 2013, representing realized losses from the sale of securities. For the three months ended September 30, 2014, proceeds of $337.3 million were received from the sale of securities, representing gross realized gains and losses of $1.0 million and $0.7 million, respectively. For the three months ended September 30, 2013, proceeds of $316.4 million were received from the sale of securities, representing gross realized gains and losses of $0.1 million and $2.3 million, respectively.

Net investment security losses of $3.3 million were recognized in the nine months ended September 30, 2014, and include $3.9 million of charges related to the other-than-temporary impairment of certain Community Reinvestment Act (CRA) eligible held to maturity securities. Net investment security losses of $1.9 million were recognized in the nine months ended September 30, 2013, representing net realized losses from the sale of securities. For the nine months ended September 30, 2014, proceeds of $801.2 million were received from the sale of securities, representing gross realized gains and losses totaling $1.7 million and $1.1 million, respectively. For the nine months ended September 30, 2013, proceeds of $398.1 million were received from the sale of securities, representing gross realized gains and losses totaling $0.4 million and $2.3 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 September 30, 2014, and December 31, 2013.

Securities with Unrealized Losses as of September 30, 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	$	1,596.0	$	1.5	$	—	$	—	$	1,596.0	$	1.5
Government Sponsored Agency		2,099.2		8.3		1,773.5		16.9		3,872.7		25.2
Non-U.S. Government		235.4		0.1		80.3		0.6		315.7		0.7
Corporate Debt		862.3		2.8		1,258.0		30.6		2,120.3		33.4
Covered Bonds		77.0		0.1		9.9		0.1		86.9		0.2
Supranational and Non-U.S. Agency Bonds		438.2		0.7		300.8		2.4		739.0		3.1
Residential Mortgage-Backed		—		—		15.0		1.3		15.0		1.3
Other Asset-Backed		485.2		0.1		7.1		0.1		492.3		0.2
Certificates of Deposit		552.0		0.1		—		—		552.0		0.1
Auction Rate		1.1		0.1		5.1		0.4		6.2		0.5
Other		13.0		8.5		43.4		7.8		56.4		16.3
Total	$	6,359.4	$	22.3	$	3,493.1	$	60.2	$	9,852.5	$	82.5

Securities with Unrealized Losses as of December 31, 2013	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	$	896.4	$	1.4	$	—	$	—	$	896.4	$	1.4
Government Sponsored Agency		4,340.8		42.6		413.7		5.3		4,754.5		47.9
Non-U.S. Government		176.7		1.1		—		—		176.7		1.1
Corporate Debt		1,759.5		85.4		267.0		15.8		2,026.5		101.2
Covered Bonds		278.8		5.7		9.9		0.2		288.7		5.9
Supranational and Non-U.S. Agency Bonds		612.7		4.9		—		—		612.7		4.9
Residential Mortgage-Backed		—		—		42.0		4.4		42.0		4.4
Other Asset-Backed		677.0		0.4		—		—		677.0		0.4
Certificates of Deposit		684.2		0.2		—		—		684.2		0.2
Auction Rate		22.1		0.1		14.0		0.7		36.1		0.8
Other		25.7		4.0		29.5		8.2		55.2		12.2
Total	$	9,473.9	$	145.8	$	776.1	$	34.6	$	10,250.0	$	180.4

As of September 30, 2014, 471 securities with a combined fair value of $9.9 billion were in an unrealized loss position, with their combined unrealized losses totaling $82.5 million. Unrealized losses of $33.4 million within corporate debt securities primarily reflect higher market rates since purchase; 40% of the corporate debt portfolio is backed by guarantees provided by U.S. and non-U.S. governmental entities. Unrealized losses of $25.2 million related to government sponsored agency securities are primarily attributable to changes in market rates since their purchase.

Unrealized losses on residential mortgage-backed securities totaling $1.3 million reflect the impact of wider credit and liquidity spreads on the valuations of two residential mortgage-backed securities since purchase, with both having been in an unrealized loss position for more than 12 months. Securities classified as “other asset-backed” had average lives less than 5 years, and 100% were rated triple-A.

The majority of the $16.3 million of unrealized losses in securities classified as “other” at September 30, 2014, relate to securities primarily purchased at a premium or par by Northern Trust for compliance with CRA. Unrealized losses on these CRA related securities are 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 $0.5 million related to auction rate securities primarily reflect reduced market liquidity as a majority of auctions continue to fail preventing holders from liquidating their investments at par. The remaining unrealized losses on Northern Trust’s securities portfolio as of September 30, 2014, are attributable to changes in overall market interest rates, increased credit spreads, or reduced market liquidity. As of September 30, 2014, Northern Trust does not intend to sell any investment in an unrealized loss position and it is not more likely than not that Northern Trust will 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 following describes Northern Trust’s process for identifying credit impairment within non-agency residential mortgage-backed securities, the security type for which Northern Trust has previously recognized the majority of its OTTI. To determine if an unrealized loss on a non-agency residential mortgage-backed security is other-than-temporary, economic models are used to perform cash flow analyses by developing multiple scenarios in order to create reasonable forecasts of the security’s future performance using available data including servicers’ loan charge off patterns, prepayment speeds, annualized default rates, each security’s current delinquency pipeline, the delinquency pipeline’s growth rate, the roll rate from delinquency to default, loan loss severities and historical performance of like collateral, along with Northern Trust’s outlook for the housing market and the overall economy. If the present value of future cash flows projected as a result of this analysis is less than the current amortized cost of the security, a credit-related OTTI loss is recorded in earnings equal to the difference between the two amounts.

Impairments of non-agency residential mortgage-backed securities are influenced by a number of factors, including but not limited to, U.S. economic and housing market performance, security credit enhancement level, insurance coverage, year of origination, and type of collateral. The factors used in estimating losses on non-agency residential mortgage-backed securities vary by year of origination and type of collateral.

As of September 30, 2014, loss estimates for subprime, Alt-A, prime and 2nd lien collateral portfolios were developed using default roll rates, determined primarily by the stage of delinquency of the underlying instrument, that generally assumed ultimate default rates approximating 5% to 30% for current loans; 30% for loans 30 to 60 days delinquent; 80% for loans 60 to 90 days delinquent; 90% for loans delinquent greater than 90 days; and 100% for OREO properties and loans that are in foreclosure. Amortized cost, weighted average ultimate default rates, and impairment severity rates for the non-agency residential mortgage-backed securities portfolio, by security type as of September 30, 2014, are provided in the following table.

($ In Millions)	September 30, 2014
	Amortized Cost		Weighted Average Ultimate Default Rates			Loss Severity Rates
Security Type						Low			High			Weighted Average
Prime	$	2.0		5.4	%		32.1	%		32.1	%		32.1	%
Alt-A		11.2		40.0			62.8			62.8			62.8
2nd Lien		5.6		32.7			98.7			99.0			99.0
Total Non-Agency Residential Mortgage-Backed Securities	$	18.8		33.1	%		32.1	%		99.0	%		70.3	%

Northern Trust’s processes for identifying credit impairment within auction rate securities are largely consistent with the processes utilized for non-agency residential mortgage-backed securities and include analyses of expected loss severities and default rates adjusted for the type of underlying loan and the presence of government guarantees, as applicable.

The process for identifying credit impairment within CRA eligible mortgage-backed securities incorporates an expected loss approach using discounted cash flows on the underlying collateral pools. To evaluate whether an unrealized loss on CRA 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 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 mortgage-backed securities vary by vintage of loan origination and collateral quality.

There were no OTTI losses recognized in the three months ended September 30, 2014, or in the three or nine months ended September 30, 2013. There were $3.9 million of OTTI losses recognized during the nine months ended September 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 nine months ended September 30, 2014, and 2013.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014			2013
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 other-than-temporary impairments in the respective 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 other-than-temporary impairments in the respective period, the balance includes the portion of the excess of amortized cost over the fair value of the impaired securities that was recorded in 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.

	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	2014			2013		2014			2013
Cumulative Credit-Related Losses on Securities Held — Beginning of Period	$	12.7		$	8.8	$	8.8		$	42.3
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		(1.8	)		—		(1.8	)		(33.5	)
Cumulative Credit-Related Losses on Securities Held — End of Period	$	10.9		$	8.8	$	10.9		$	8.8

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Fair Value Measurements

9 Months Ended

Sep. 30, 2014

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 nine months ended September 30, 2014, or the year ended December 31, 2013.

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 September 30, 2014, Northern Trust’s available for sale securities portfolio included 843 Level 2 securities with an aggregate market value of $24.6 billion. Of those, 842 securities, with an aggregate market value of $24.5 billion, were valued by external pricing vendors. The remaining security, with an aggregate market value of $88.0 million, was valued consistent with prices of similar securities as there were no vended prices available for that security. As of December 31, 2013, Northern Trust’s available for sale securities portfolio included 831 Level 2 securities with an aggregate market value of $26.4 billion. Of those, 829 securities, with an aggregate market value of $26.3 billion, were valued by external pricing vendors. The remaining 2 securities, with an aggregate market value of $57.4 million, were valued consistent with prices of similar securities as there were no vended prices available for these securities. Trading account securities, which totaled $4.3 million and $1.7 million as of September 30, 2014, and December 31, 2013, 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; credit spreads, default probabilities, and recovery rates for credit default swap contracts; interest rates for interest rate swap contracts and forward contracts; and interest rates and volatility inputs for interest rate option contracts. Northern Trust evaluates the impact of counterparty credit risk and its own credit risk on the valuation of its derivative instruments. Factors considered include the likelihood of default by Northern Trust and its counterparties, the remaining maturities of the instruments, net exposures after giving effect to master netting arrangements or similar agreements, available collateral, and other credit enhancements in determining the appropriate fair value of derivative instruments. The resulting valuation adjustments have not been considered material.

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

Northern Trust’s Level 3 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. Level 3 liabilities at December 31, 2013, consisted of acquisition-related contingent consideration liabilities, the fair value of which was determined using an income-based (discounted cash flow) model that incorporated

Northern Trust’s own assumptions about business growth rates and applicable discount rates, which represented unobservable inputs to the model. In April 2014, Northern Trust made a payment of $55.3 million to extinguish the contingent consideration liability at the value agreed by the parties.

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 Policy, Corporate Financial Management, and relevant business unit personnel) determine the valuation policies and procedures for Level 3 assets and liabilities. Each business and department represents a component of Northern Trust’s business units, and reports to management of their respective business units. 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 as of September 30, 2014.

Financial Instrument	Fair Value		Valuation Technique	Unobservable Inputs	Range of Lives and Rates
Auction Rate Securities	$	85.2 million	Discounted Cash Flow	Remaining lives Discount rates	1.7 — 8.6 years 0.2% — 7.9%

The following tables present assets and liabilities measured at fair value on a recurring basis as of September 30, 2014, and December 31, 2013, segregated by fair value hierarchy level.

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
September 30, 2014
Securities
Available for Sale
U.S. Government	$	3,409.6	$	—	$	—	$	—		$	3,409.6
Obligations of States and Political Subdivisions		—		4.6		—		—			4.6
Government Sponsored Agency		—		16,174.4		—		—			16,174.4
Non-U.S. Government		—		310.5		—		—			310.5
Corporate Debt		—		3,364.8		—		—			3,364.8
Covered Bonds		—		1,978.9		—		—			1,978.9
Supranational and Non-U.S. Agency Bonds		—		360.2		—		—			360.2
Residential Mortgage-Backed		—		17.6		—		—			17.6
Other Asset-Backed		—		2,233.1		—		—			2,233.1
Auction Rate		—		—		85.2		—			85.2
Other		—		168.8		—		—			168.8
Total Available for Sale		3,409.6		24,612.9		85.2		—			28,107.7
Trading Account		—		4.3		—		—			4.3
Total Available for Sale and Trading Securities		3,409.6		24,617.2		85.2		—			28,112.0
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		4,203.8		—		—			4,203.8
Interest Rate Contracts		—		213.5		—		—			213.5
Total Derivative Assets		—		4,417.3		—		(2,358.4	)		2,058.9
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		4,141.6		—		—			4,141.6
Interest Rate Swaps		—		123.5		—		—			123.5
Total Derivative Liabilities	$	—	$	4,265.1	$	—	$	(2,752.3	)	$	1,512.8

Note: Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of September 30, 2014, derivative assets and liabilities shown above also include reductions of $207.4 million and $601.3 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

(In Millions)	Level 1		Level 2		Level 3		Netting			Assets/Liabilities at Fair Value
December 31, 2013
Securities
Available for Sale
U.S. Government	$	1,917.9	$	—	$	—	$	—		$	1,917.9
Obligations of States and Political Subdivisions		—		4.6		—		—			4.6
Government Sponsored Agency		—		17,528.0		—		—			17,528.0
Non-U.S. Government		—		310.6		—		—			310.6
Corporate Debt		—		3,524.5		—		—			3,524.5
Covered Bonds		—		1,943.9		—		—			1,943.9
Supranational and Non-U.S. Agency Bonds		—		410.0		—		—			410.0
Residential Mortgage-Backed		—		48.1		—		—			48.1
Other Asset-Backed		—		2,391.8		—		—			2,391.8
Auction Rate		—		—		98.9		—			98.9
Other		—		214.5		—		—			214.5
Total Available for Sale		1,917.9		26,376.0		98.9		—			28,392.8
Trading Account		—		1.7		—		—			1.7
Total Available for Sale and Trading Securities		1,917.9		26,377.7		98.9		—			28,394.5
Other Assets
Derivative Assets
Foreign Exchange Contracts		—		2,865.7		—		—			2,865.7
Interest Rate Contracts		—		237.9		—		—			237.9
Total Derivative Assets		—		3,103.6		—		(1,369.0	)		1,734.6
Other Liabilities
Derivative Liabilities
Foreign Exchange Contracts		—		2,905.7		—		—			2,905.7
Interest Rate Swaps		—		195.2		—		—			195.2
Total Derivative Liabilities		—		3,100.9		—		(1,926.0	)		1,174.9
Contingent Consideration	$	—	$	—	$	55.4	$	—		$	55.4

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 December 31, 2013, derivative assets and liabilities shown above also include reductions of $210.7 million and $767.7 million, 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 nine months ended September 30, 2014, and 2013.

Level 3 Assets (In Millions)	Auction Rate Securities
Three Months Ended September 30,	2014			2013
Fair Value at July 1	$	98.8		$	99.1
Total Gains (Losses):
Included in Earnings		0.7			—
Included in Other Comprehensive Income (2)		0.1			0.3
Purchases, Issues, Sales, and Settlements:
Sales		(14.4	)		—
Fair Value at September 30	$	85.2		$	98.7

Nine Months Ended September 30,	2014			2013
Fair Value at January 1	$	98.9		$	97.8
Total Gains (Losses):
Included in Earnings (1)		0.7			0.1
Included in Other Comprehensive Income (2)		0.4			3.0
Purchases, Issues, Sales, and Settlements:
Sales		(14.4	)		—
Settlements		(0.4	)		(2.2	)
Fair Value at September 30	$	85.2		$	98.7

(1) Realized gains for the three and nine months ended September 30, 2014, of $0.7 million, represent gains from sales of securities. Realized gains for the nine month period ended September 30, 2013, of $0.1 million, represent gains from redemptions by issuers. Gains on sales are recorded in investment security gains (losses) and gains on redemptions are recorded in interest income, within the consolidated statement of income.

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

Level 3 Liabilities (In Millions)	Contingent Consideration
Three Months Ended September 30,	2014			2013
Fair Value at July 1	$	—		$	52.7
Total (Gains) Losses:
Included in Earnings (1)		—			1.3
Included in Other Comprehensive Income		—			—
Purchases, Issues, Sales, and Settlements		—			—
Fair Value at September 30	$	—		$	54.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at September 30 (1)	$	—		$	1.3
Nine Months Ended September 30,	2014			2013
Fair Value at January 1	$	55.4		$	50.1
Total (Gains) Losses:
Included in Earnings (1)		(0.1	)		3.9
Included in Other Comprehensive Income		—			—
Purchases, Issues, Sales, and Settlements:
Settlements		(55.3	)		—
Fair Value at September 30	$	—		$	54.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at September 30 (1)	$	—		$	3.9

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

During the nine months ended September 30, 2014, and 2013, 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 September 30, 2014, and 2013, 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. 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 $26.6 million and $1.5 million, respectively, at September 30, 2014, and $38.1 million and $1.6 million, respectively, at September 30, 2013. 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 September 30, 2014.

Financial Instrument	Fair Value	Valuation Technique	Unobservable Input	Range of Discounts Applied
Loans	$26.6 million	Market Approach	Discount to reflect realizable value	15% — 25%
OREO	$1.5 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 on Northern Trust’s consolidated balance sheet 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.

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). As required by GAAP, the fair values required to be disclosed for demand, noninterest-bearing, savings, and money market deposits must equal the amounts disclosed in the consolidated balance sheet, even though such deposits are typically priced at a premium in banking industry consolidations.

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

(In Millions)	September 30, 2014
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	2,918.9	$	2,918.9	$	2,918.9	$	—	$	—
Federal Funds Sold and Resell Agreements		1,010.0		1,010.0		—		1,010.0		—
Interest-Bearing Deposits with Banks		15,334.5		15,334.5		—		15,334.5		—
Federal Reserve Deposits		21,328.0		21,328.0		—		21,328.0		—
Securities
Available for Sale (1)		28,107.7		28,107.7		3,409.6		24,612.9		85.2
Held to Maturity		4,196.7		4,195.1		—		4,195.1		—
Trading Account		4.3		4.3		—		4.3		—
Loans (excluding Leases)
Held for Investment		29,499.6		29,522.7		—		—		29,522.7
Held for Sale		2.1		2.1		—		—		2.1
Client Security Settlement Receivables		1,538.6		1,538.6		—		1,538.6		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		207.5		207.5		—		207.5		—
Community Development Investments		225.1		223.8		—		223.8		—
Employee Benefit and Deferred Compensation		145.2		147.4		97.4		50.0		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	39,267.4	$	39,267.4	$	39,267.4	$	—	$	—
Savings Certificates and Other Time		1,869.0		1,869.5		—		1,869.5		—
Non U.S. Offices Interest-Bearing		50,586.1		50,586.1		—		50,586.1		—
Federal Funds Purchased		786.4		786.4		—		786.4		—
Securities Sold under Agreements to Repurchase		866.8		866.8		—		866.8		—
Other Borrowings		1,758.3		1,758.9		—		1,758.9		—
Senior Notes		1,496.9		1,526.8		—		1,526.8		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,565.5		1,595.5		—		1,595.5		—
Federal Home Loan Bank Borrowings		—		—		—		—		—
Floating Rate Capital Debt		277.2		242.8		—		242.8		—
Other Liabilities
Standby Letters of Credit		57.0		57.0		—		—		57.0
Loan Commitments		28.7		28.7		—		—		28.7
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	71.0	$	71.0	$	—	$	71.0	$	—
Liabilities		16.1		16.1		—		16.1		—
Interest Rate Contracts
Assets		113.3		113.3		—		113.3		—
Liabilities		27.6		27.6		—		27.6		—
Client-Related and Trading
Foreign Exchange Contracts
Assets		4,132.8		4,132.8		—		4,132.8		—
Liabilities		4,125.5		4,125.5		—		4,125.5		—
Interest Rate Contracts
Assets		100.2		100.2		—		100.2		—
Liabilities		95.9		95.9		—		95.9		—

(1) Refer to the table located on page 36 for the disaggregation of available for sale securities.

(In Millions)	December 31, 2013
	Book Value		Total Fair Value		Fair Value
					Level 1		Level 2		Level 3
Assets
Cash and Due from Banks	$	3,162.4	$	3,162.4	$	3,162.4	$	—	$	—
Federal Funds Sold and Resell Agreements		529.6		529.6		—		529.6		—
Interest-Bearing Deposits with Banks		19,397.4		19,397.4		—		19,397.4		—
Federal Reserve Deposits and Other Interest-Bearing		12,911.5		12,911.5		—		12,911.5		—
Securities
Available for Sale (1)		28,392.8		28,392.8		1,917.9		26,376.0		98.9
Held to Maturity		2,325.8		2,321.4		—		2,321.4		—
Trading Account		1.7		1.7		—		1.7		—
Loans (excluding Leases)
Held for Investment		28,136.5		28,147.2		—		—		28,147.2
Held for Sale		—		—		—		—		—
Client Security Settlement Receivables		1,355.2		1,355.2		—		1,355.2		—
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		194.7		194.7		—		194.7		—
Community Development Investments		228.1		227.8		—		227.8		—
Employee Benefit and Deferred Compensation		132.7		126.9		79.3		47.6		—
Liabilities
Deposits
Demand, Noninterest-Bearing, Savings and Money Market	$	33,762.0	$	33,762.0	$	33,762.0	$	—	$	—
Savings Certificates and Other Time		1,874.4		1,877.1		—		1,877.1		—
Non U.S. Offices Interest-Bearing		48,461.7		48,461.7		—		48,461.7		—
Federal Funds Purchased		965.1		965.1		—		965.1		—
Securities Sold under Agreements to Repurchase		917.3		917.3		—		917.3		—
Other Borrowings		1,558.6		1,558.6		—		1,558.6		—
Senior Notes		1,996.6		1,989.3		—		1,989.3		—
Long Term Debt (excluding Leases)
Subordinated Debt		1,537.3		1,563.5		—		1,563.5		—
Federal Home Loan Bank Borrowings		135.0		137.2		—		137.2		—
Floating Rate Capital Debt		277.1		230.2		—		230.2		—
Other Liabilities
Standby Letters of Credit		59.6		59.6		—		—		59.6
Contingent Consideration		55.4		55.4		—		—		55.4
Loan Commitments		35.7		35.7		—		—		35.7
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	21.0	$	21.0	$	—	$	21.0	$	—
Liabilities		59.5		59.5		—		59.5		—
Interest Rate Swaps
Assets		115.1		115.1		—		115.1		—
Liabilities		78.2		78.2		—		78.2		—
Client-Related and Trading
Foreign Exchange Contracts
Assets		2,844.7		2,844.7		—		2,844.7		—
Liabilities		2,846.2		2,846.2		—		2,846.2		—
Interest Rate Contracts
Assets		122.8		122.8		—		122.8		—
Liabilities		117.0		117.0		—		117.0		—

(1) Refer to the table located on page 37 for the disaggregation of available for sale securities.

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Pension and Other Postretirement Plans

9 Months Ended

Sep. 30, 2014

Pension and Other Postretirement Plans

15. Pension and Other Postretirement Plans — 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 other postretirement plan for the three and nine months ended September 30, 2014, and 2013.

Net Periodic Pension Expense U.S. Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2014			2013			2014			2013
Service Cost	$	8.2		$	7.5		$	24.6		$	22.7
Interest Cost		11.1			10.5			33.3			31.6
Expected Return on Plan Assets		(24.4	)		(23.1	)		(73.3	)		(69.2	)
Amortization
Net Actuarial Loss		(0.1	)		10.3			(0.3	)		30.9
Prior Service Cost		5.4			(0.1	)		16.1			(0.3	)
Net Periodic Pension Expense	$	0.2		$	5.1		$	0.4		$	15.7

Net Periodic Pension Expense (Benefit) Non U.S. Plans	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2014			2013			2014			2013
Interest Cost	$	1.8		$	1.6		$	5.3		$	4.9
Expected Return on Plan Assets		(1.8	)		(1.5	)		(5.3	)		(4.6	)
Net Actuarial Loss Amortization		(0.4	)		0.2			(1.2	)		0.7
Net Periodic Pension Expense (Benefit)	$	(0.4	)	$	0.3		$	(1.2	)	$	1.0

Net Periodic Pension Expense Supplemental Plan	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014		2013
Service Cost	$	0.8	$	0.4	$	2.3	$	1.2
Interest Cost		1.2		1.1		3.6		3.3
Amortization
Net Actuarial Loss		0.2		1.7		0.4		5.1
Prior Service Cost		1.5		0.2		4.4		0.4
Net Periodic Pension Expense	$	3.7	$	3.4	$	10.7	$	10.0

Net Periodic Postretirement Expense (Benefit) Other Postretirement Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2014			2013			2014			2013
Service Cost	$	—		$	—		$	0.1		$	0.1
Interest Cost		0.4			0.3			1.1			0.9
Amortization
Net Actuarial Gain		—			(0.3	)		—			(0.9	)
Prior Service Cost		(0.1	)		(0.7	)		(0.4	)		(2.2	)
Net Periodic Postretirement Expense (Benefit)	$	0.3		$	(0.7	)	$	0.8		$	(2.1	)

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Accumulated Other Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 2014

Accumulated Other Comprehensive Income (Loss)

11. Accumulated Other Comprehensive Income (Loss) — The following tables summarize the components of accumulated other comprehensive income (loss) at September 30, 2014, and 2013, and changes during the three and nine month periods then ended.

(In Millions)	Balance at December 31, 2013			Net Change			Balance at September 30, 2014
Net Unrealized Gains (Losses) on Securities Available for Sale	$	6.0		$	32.3		$	38.3
Net Unrealized Gains (Losses) on Cash Flow Hedges		2.9			(6.4	)		(3.5	)
Net Foreign Currency Adjustments		7.1			(10.5	)		(3.4	)
Net Pension and Other Postretirement Benefit Adjustments		(260.3	)		10.5			(249.8	)
Total	$	(244.3	)	$	25.9		$	(218.4	)

(In Millions)	Balance at December 31, 2012			Net Change			Balance at September 30, 2013
Net Unrealized Gains (Losses) on Securities Available for Sale	$	101.0		$	(74.4	)	$	26.6
Net Unrealized Gains (Losses) on Cash Flow Hedges		(1.4	)		1.2			(0.2	)
Net Foreign Currency Adjustments		10.5			(2.8	)		7.7
Net Pension and Other Postretirement Benefit Adjustments		(393.1	)		21.1			(372.0	)
Total	$	(283.0	)	$	(54.9	)	$	(337.9	)

	Three Months Ended September 30,
	2014									2013
(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 Gains (Losses) on Securities OTTI	$	5.5		$	(2.1	)	$	3.4		$	—		$	—		$	—
Other Unrealized Gains (Losses) on Securities Available for Sale		(14.2	)		5.4			(8.8	)		7.3			(2.8	)		4.5
Reclassification Adjustment for (Gains) Losses Included in Net Income		(0.3	)		—			(0.3	)		2.1			(0.8	)		1.3
Net Change		(9.0	)		3.3			(5.7	)		9.4			(3.6	)		5.8
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		(7.6	)		2.5			(5.1	)		5.3			(1.7	)		3.6
Reclassification Adjustment for (Gains) Losses Included in Net Income		(3.7	)		1.4			(2.3	)		1.1			(0.4	)		0.7
Net Change		(11.3	)		3.9			(7.4	)		6.4			(2.1	)		4.3
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		(77.1	)		6.6			(70.5	)		55.0			(4.0	)		51.0
Long-Term Intra-Entity Foreign Currency Transaction Losses		(7.4	)		—			(7.4	)		—			—			—
Net Investment Hedge Gains (Losses)		119.9			(45.6	)		74.3			(88.8	)		33.4			(55.4	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		35.4			(39.0	)		(3.6	)		(33.8	)		29.4			(4.4	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		6.5			(3.0	)		3.5			11.3			(4.2	)		7.1
Net Change	$	6.5		$	(3.0	)	$	3.5		$	11.3		$	(4.2	)	$	7.1

	Nine Months Ended September 30,
	2014									2013
(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 Gains (Losses) on Securities OTTI	$	3.7		$	(1.4	)	$	2.3		$	2.1		$	(0.8	)	$	1.3
Other Unrealized Gains (Losses) on Securities Available for Sale		48.8			(18.2	)		30.6			(123.2	)		46.3			(76.9	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		(0.6	)		—			(0.6	)		1.9			(0.7	)		1.2
Net Change		51.9			(19.6	)		32.3			(119.2	)		44.8			(74.4	)
Unrealized Gains (Losses) on Cash Flow Hedges
Unrealized Gains (Losses) on Cash Flow Hedges		(6.5	)		2.2			(4.3	)		(4.0	)		1.6			(2.4	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		(3.3	)		1.2			(2.1	)		5.7			(2.1	)		3.6
Net Change		(9.8	)		3.4			(6.4	)		1.7			(0.5	)		1.2
Foreign Currency Adjustments
Foreign Currency Translation Adjustments		(57.2	)		6.0			(51.2	)		5.3			(2.3	)		3.0
Long-Term Intra-Entity Foreign Currency Transaction Losses		(9.0	)		—			(9.0	)		—			—			—
Net Investment Hedge Gains (Losses)		79.7			(30.0	)		49.7			(9.3	)		3.5			(5.8	)
Reclassification Adjustment for (Gains) Losses Included in Net Income		—			—			—			—			—			—
Net Change		13.5			(24.0	)		(10.5	)		(4.0	)		1.2			(2.8	)
Pension and Other Postretirement Benefit Adjustments
Net Actuarial Gain (Loss)		—			—			—			—			—			—
Reclassification Adjustment for (Gains) Losses Included in Net Income		19.0			(8.5	)		10.5			33.7			(12.6	)		21.1
Net Change	$	19.0		$	(8.5	)	$	10.5		$	33.7		$	(12.6	)	$	21.1

The following table provides the location and before-tax amounts of reclassifications out of accumulated other comprehensive income (loss) during the three and nine months ended September 30, 2014.

(In Millions)	Location of Reclassification Adjustments Recognized in Income	Amount of Reclassification Adjustments Recognized in Income
		Three Months Ended			Nine Months Ended
		September 30, 2014
Securities Available for Sale
Realized (Gains) Losses on Securities Available for Sale	Investment Security Gains (Losses), net	$	(0.3	)	$	(0.6	)
Realized (Gains) Losses on Cash Flow Hedges
Foreign Exchange Contracts	Other Operating Income/Expense		(3.7	)		(3.3	)
Pension and Other Postretirement Benefit Adjustments
Amortization of Net Actuarial (Gain) Loss	Employee Benefits		(0.3	)		(1.1	)
Amortization of Prior Service Cost	Employee Benefits		6.8			20.1
Gross Reclassification Adjustment		$	6.5		$	19.0

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Contingent Liabilities - Additional Information (Detail) (USD $)	1 Months Ended	3 Months Ended
	Apr. 30, 2014	Dec. 31, 2013	Sep. 30, 2014
Commitments and Contingencies Disclosure [Line Items]
Standby letters of credit outstanding		$ 4,500,000,000	$ 4,300,000,000
Minimum securities lending related collateral percentage			100.00%
Possible loss in future periods in excess of accrual			130,000,000
Legal Settlement Charge		19,200,000
Remaining Visa shares held by Northern Trust, original cost basis			0
Fair value of contingent consideration		55,400,000
Settlement of contingent consideration	55,300,000
Indemnification Agreement
Commitments and Contingencies Disclosure [Line Items]
Collateralized securities loaned, subject to indemnification		82,700,000,000	99,900,000,000
Credit loss liability		$ 0	$ 0

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Pledged Assets

9 Months Ended

Sep. 30, 2014

Pledged Assets

7. Pledged Assets — Certain of Northern Trust’s subsidiaries, as required or permitted by law, pledge assets to secure public and trust deposits; repurchase agreements; Federal Home Loan Bank borrowings; and for other purposes, including support for securities settlement, primarily related to client activities, and for potential Federal Reserve Bank discount window borrowings. At September 30, 2014, securities and loans totaling $32.4 billion ($23.5 billion of government sponsored agency and other securities, $137.0 million of obligations of states and political subdivisions, and $8.8 billion of loans) were pledged. This compares to $32.4 billion ($22.6 billion of government sponsored agency and other securities, $222.7 million of obligations of states and political subdivisions, and $9.6 billion of loans) at December 31, 2013. Collateral required for these purposes totaled $3.5 billion and $5.0 billion at September 30, 2014, and December 31, 2013, respectively. Included in the total pledged assets at September 30, 2014, and December 31, 2013 were available for sale securities with a total fair value of $865.5 million and $915.3 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 as of September 30, 2014, and December 31, 2013, was $1.0 billion and $500.0 million, respectively. There was no repledged or sold collateral at September 30, 2014, or December 31, 2013. Deposits maintained to meet Federal Reserve Bank reserve requirements averaged $1.3 billion for the three and nine months ended September 30, 2014, and $0.9 billion for both the three and nine months ended September 30, 2013.

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Loans and Leases - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended										9 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Lower Limit	Sep. 30, 2014 Upper Limit	Sep. 30, 2014 First Lien	Dec. 31, 2013 First Lien	Sep. 30, 2014 Equity	Dec. 31, 2013 Equity	Sep. 30, 2014 Nonperforming Financing Receivable	Dec. 31, 2013 Nonperforming Financing Receivable	Sep. 30, 2014 Performing Financing Receivable	Dec. 31, 2013 Performing Financing Receivable	Sep. 30, 2014 Performing Financing Receivable Lower Limit	Jun. 30, 2014 Residential Real Estate Re-Defaulted Loan	Jun. 30, 2013 Residential Real Estate Re-Defaulted Loan
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
Equity credit lines										$ 1,800,000,000	$ 2,000,000,000
Loans held by Northern trust								88.00%	87.00%
Other U.S. loans and non-U.S. loans, short duration advances	1,400,000,000		1,400,000,000		1,300,000,000
Demand deposits	109,000,000		109,000,000		104,100,000
Loans held for sale	2,100,000		2,100,000		0
Days contractually past due for interest and principal and the loan is not well-secured and in the process of collection						90 days
Number of days past due for disclosure purposes to be categorized as a current							29 days
Maximum limit of individual homogeneous loans collective evaluation for impairment and excluded from impaired loan disclosures	250,000		250,000
Interest income that would have been recorded for nonperforming loans	2,200,000	2,800,000	7,100,000	8,000,000
Undrawn loan commitments and standby letters of credit	3,500,000		3,500,000		3,400,000
Total Loans and Leases	$ 30,719,900,000		$ 30,719,900,000		$ 29,385,500,000							$ 58,600,000	$ 72,700,000	$ 96,900,000	$ 89,800,000
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
Number of Loans and Leases																	0	0

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Loans and Leases

9 Months Ended

Sep. 30, 2014

Loans and Leases

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

(In Millions)	September 30, 2014			December 31, 2013
Commercial
Commercial and Institutional	$	8,212.1		$	7,375.8
Commercial Real Estate		3,107.7			2,955.8
Lease Financing, net		952.5			975.1
Non-U.S.		1,408.4			954.7
Other		187.9			358.6
Total Commercial		13,868.6			12,620.0
Personal
Residential Real Estate		9,872.7			10,271.3
Private Client		6,953.1			6,445.6
Other		25.5			48.6
Total Personal		16,851.3			16,765.5
Total Loans and Leases		30,719.9			29,385.5
Allowance for Credit Losses Assigned to Loans and Leases		(269.4	)		(278.1	)
Net Loans and Leases	$	30,450.5		$	29,107.4

Residential real estate loans consist of traditional first lien mortgages and equity credit lines that generally require a loan to collateral value of no more than 65% to 80% at inception. Northern Trust’s equity credit line products generally have draw periods of up to 10 years and a balloon payment of any outstanding balance is due at maturity. Payments are interest only with variable interest rates. Northern Trust does not offer equity credit lines that include an option to convert the outstanding balance to an amortizing payment loan.

As of September 30, 2014, and December 31, 2013, equity credit lines totaled $1.8 billion and $2.0 billion, respectively, and equity credit lines for which first liens were held by Northern Trust represented 88% and 87%, respectively, of the total equity credit lines as 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 September 30, 2014, and $1.3 billion at December 31, 2013. Demand deposits reclassified as loan balances totaled $109.0 million and $104.1 million at September 30, 2014, and December 31, 2013, respectively. Loans classified as held for sale totaled $2.1 million at September 30, 2014. There were no loans classified as held for sale at December 31, 2013.

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, 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, return on assets, asset size, and capital levels;

• Commercial Real Estate: debt service coverage and leasing status for income-producing properties; loan-to-value and loan-to-cost ratios, leasing status, and guarantor support for loans associated with construction and development properties;

• Lease Financing and Commercial-Other: leverage and profit margin levels;

• Non-U.S.: entity type, liquidity, size, and leverage;

• Residential Real Estate: payment history, credit bureau scores, and cash flow-to-debt and net worth ratios;

• Private Client: cash flow-to-debt and net worth ratios, leverage, and profit margin levels; 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 September 30, 2014, and December 31, 2013, are provided below, segregated by borrower ratings into “1 to 3”, “4 to 5” and “6 to 9” (watch list), categories.

	September 30, 2014								December 31, 2013
(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	$	5,115.4	$	2,983.6	$	113.1	$	8,212.1	$	4,432.5	$	2,801.5	$	141.8	$	7,375.8
Commercial Real Estate		1,263.6		1,718.2		125.9		3,107.7		1,053.7		1,748.7		153.4		2,955.8
Lease Financing, net		572.2		376.1		4.2		952.5		685.7		285.0		4.4		975.1
Non-U.S.		643.7		763.8		0.9		1,408.4		442.8		511.9		—		954.7
Other		137.4		50.5		—		187.9		157.7		200.9		—		358.6
Total Commercial		7,732.3		5,892.2		244.1		13,868.6		6,772.4		5,548.0		299.6		12,620.0
Personal
Residential Real Estate		2,995.7		6,439.9		437.1		9,872.7		3,204.6		6,563.6		503.1		10,271.3
Private Client		4,461.8		2,479.9		11.4		6,953.1		3,957.6		2,481.2		6.8		6,445.6
Other		18.6		6.9		—		25.5		21.2		27.4		—		48.6
Total Personal		7,476.1		8,926.7		448.5		16,851.3		7,183.4		9,072.2		509.9		16,765.5
Total Loans and Leases	$	15,208.4	$	14,818.9	$	692.6	$	30,719.9	$	13,955.8	$	14,620.2	$	809.5	$	29,385.5

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. At the time a loan is determined to be nonperforming, interest accrued but not collected is reversed against interest income of the current period and the loan is classified as nonperforming. 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 other real estate owned and nonperforming asset balances, as of September 30, 2014, and December 31, 2013.

September 30, 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	$	8,153.8	$	10.2	$	13.3	$	3.1	$	8,180.4	$	31.7	$	8,212.1
Commercial Real Estate		3,044.4		7.8		5.2		10.4		3,067.8		39.9		3,107.7
Lease Financing, net		952.5		—		—		—		952.5		—		952.5
Non-U.S.		1,408.4		—		—		—		1,408.4		—		1,408.4
Other		187.9		—		—		—		187.9		—		187.9
Total Commercial		13,747.0		18.0		18.5		13.5		13,797.0		71.6		13,868.6
Personal
Residential Real Estate		9,702.1		7.9		9.0		6.4		9,725.4		147.3		9,872.7
Private Client		6,917.8		21.1		7.4		5.2		6,951.5		1.6		6,953.1
Other		25.5		—		—		—		25.5		—		25.5
Total Personal		16,645.4		29.0		16.4		11.6		16,702.4		148.9		16,851.3
Total Loans and Leases	$	30,392.4	$	47.0	$	34.9	$	25.1	$	30,499.4	$	220.5	$	30,719.9
								Other Real Estate Owned				10.7
								Total Nonperforming Assets			$	231.2

December 31, 2013
(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	$	7,332.3	$	5.0	$	12.1	$	3.3	$	7,352.7	$	23.1	$	7,375.8
Commercial Real Estate		2,881.1		4.1		14.6		6.8		2,906.6		49.2		2,955.8
Lease Financing, net		975.1		—		—		—		975.1		—		975.1
Non-U.S.		954.7		—		—		—		954.7		—		954.7
Other		358.6		—		—		—		358.6		—		358.6
Total Commercial		12,501.8		9.1		26.7		10.1		12,547.7		72.3		12,620.0
Personal
Residential Real Estate		9,934.4		129.3		15.6		2.9		10,082.2		189.1		10,271.3
Private Client		6,404.2		29.1		7.5		3.4		6,444.2		1.4		6,445.6
Other		48.6		—		—		—		48.6		—		48.6
Total Personal		16,387.2		158.4		23.1		6.3		16,575.0		190.5		16,765.5
Total Loans and Leases	$	28,889.0	$	167.5	$	49.8	$	16.4	$	29,122.7	$	262.8	$	29,385.5
								Other Real Estate Owned				11.9
								Total Nonperforming Assets			$	274.7

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. 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.

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.

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

	As of September 30, 2014						As of December 31, 2013
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Allowance		Recorded Investment		Unpaid Principal Balance		Specific Allowance
With No Related Specific Allowance
Commercial and Institutional	$	11.6	$	14.6	$	—	$	12.2	$	18.1	$	—
Commercial Real Estate		49.2		54.9		—		46.6		57.1		—
Lease Financing, net		4.2		4.2		—		4.4		4.4		—
Residential Real Estate		170.2		214.5		—		185.0		227.8		—
Private Client		0.1		0.4		—		0.8		0.8		—
With a Related Specific Allowance
Commercial and Institutional		20.5		20.5		5.1		9.6		12.1		3.6
Commercial Real Estate		12.4		18.4		3.5		26.7		31.5		4.5
Residential Real Estate		1.3		1.5		0.4		8.1		8.7		2.3
Private Client		0.9		0.9		0.5		—		—		—
Total
Commercial		97.9		112.6		8.6		99.5		123.2		8.1
Personal		172.5		217.3		0.9		193.9		237.3		2.3
Total	$	270.4	$	329.9	$	9.5	$	293.4	$	360.5	$	10.4

	Three Months Ended September 30,								Nine Months Ended September 30,
	2014				2013				2014				2013
(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	$	12.6	$	0.1	$	10.7	$	—	$	11.5	$	0.1	$	11.3	$	0.1
Commercial Real Estate		48.5		0.2		42.0		0.2		46.0		0.7		40.6		0.6
Lease Financing, net		4.3		0.1		4.5		0.1		4.3		0.2		4.6		0.2
Residential Real Estate		172.0		0.8		168.1		0.3		180.8		2.1		155.2		1.4
Private Client		0.3		—		13.3		0.2		0.6		—		12.0		0.5
With a Related Specific Allowance
Commercial and Institutional		11.9		—		14.1		—		10.6		—		12.5		—
Commercial Real Estate		13.7		—		31.2		—		20.9		—		31.6		—
Residential Real Estate		1.3		—		10.0		—		4.1		—		9.4		—
Private Client		0.9		—		0.8		—		0.5		—		1.1		—
Total
Commercial		91.0		0.4		102.5		0.3		93.3		1.0		100.6		0.9
Personal		174.5		0.8		192.2		0.5		186.0		2.1		177.7		1.9
Total	$	265.5	$	1.2	$	294.7	$	0.8	$	279.3	$	3.1	$	278.3	$	2.8

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 $2.2 million and $2.8 million, respectively, for the three months ended September 30, 2014, and 2013, and $7.1 million and $8.0 million, respectively, for the nine months ended September 30, 2014, and 2013.

There were $3.5 million and $3.4 million of aggregate undrawn loan commitments and standby letters of credit at September 30, 2014, and December 31, 2013, respectively, issued to borrowers whose loans were classified as nonperforming or impaired.

Troubled Debt Restructurings (TDRs). Included within impaired loans were $58.6 million and $72.7 million of nonperforming TDRs, and $96.9 million and $89.8 million of performing TDRs as of September 30, 2014, and December 31, 2013, 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 nine month periods ended September 30, 2014, and 2013, and the recorded investments and unpaid principal balances as of September 30, 2014, and 2013.

($ In Millions)	Three Months Ended September 30, 2014						Nine Months Ended September 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		1	$	0.4	$	0.4		3	$	0.7	$	0.8
Commercial Real Estate		5		2.9		3.4		6		3.5		4.1
Total Commercial		6		3.3		3.8		9		4.2		4.9
Personal
Residential Real Estate		28		18.0		18.7		96		25.3		27.1
Private Client		—		—		—		3		—		0.3
Total Personal		28		18.0		18.7		99		25.3		27.4
Total Loans and Leases		34	$	21.3	$	22.5		108	$	29.5	$	32.3

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

($ In Millions)	Three Months Ended September 30, 2013						Nine Months Ended September 30, 2013
	Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance		Number of Loans and Leases		Recorded Investment		Unpaid Principal Balance
Commercial
Commercial and Institutional		—	$	—	$	—		7	$	0.5	$	1.0
Commercial Real Estate		7		22.8		25.0		11		27.4		31.9
Total Commercial		7		22.8		25.0		18		27.9		32.9
Personal
Residential Real Estate		38		6.7		11.4		122		51.2		59.8
Private Client		—		—		—		6		12.8		12.8
Total Personal		38		6.7		11.4		128		64.0		72.6
Total Loans and Leases		45	$	29.5	$	36.4		146	$	91.9	$	105.5

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 nine months ended September 30, 2014, the majority of TDR modifications of loans within the commercial real estate, residential real estate, and private client classes were extensions of term and/or other modifications. During the three and nine months ended September 30, 2013, TDR modifications of loans within the commercial and institutional, commercial real estate, and private client classes were primarily deferrals of principal; extensions of term, and other modifications, and modifications of loans within the residential real estate class were primarily deferrals of principal, interest rate concessions, extensions of term, and other modifications.

There were no loans or leases modified in TDRs in the 12 months ended June 30, 2014 or 2013, which subsequently became nonperforming during the three or nine months ended September 30, 2014 or 2013 respectively.

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.

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Allowance for Credit Losses

9 Months Ended

Sep. 30, 2014

Allowance for Credit Losses

6. 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 Allowance 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 nine months ended September 30, 2014, and 2013.

	Three Months Ended September 30,
	2014									2013
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	168.7		$	134.8		$	303.5		$	184.1		$	136.6		$	320.7
Charge-Offs		(2.5	)		(6.1	)		(8.6	)		(1.7	)		(9.9	)		(11.6	)
Recoveries		1.9			1.5			3.4			1.7			1.6			3.3
Net (Charge-Offs) Recoveries		(0.6	)		(4.6	)		(5.2	)		—			(8.3	)		(8.3	)
Provision for Credit Losses		1.0			(1.0	)		—			(4.6	)		9.6			5.0
Effect of Foreign Exchange Rates		—			—			—			0.1			—			0.1
Balance at End of Period	$	169.1		$	129.2		$	298.3		$	179.6		$	137.9		$	317.5

	Nine Months Ended September 30,
	2014									2013
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	168.0		$	139.9		$	307.9		$	194.2		$	133.4		$	327.6
Charge-Offs		(8.8	)		(19.1	)		(27.9	)		(6.9	)		(32.9	)		(39.8	)
Recoveries		10.7			4.6			15.3			8.1			6.6			14.7
Net (Charge-Offs) Recoveries		1.9			(14.5	)		(12.6	)		1.2			(26.3	)		(25.1	)
Provision for Credit Losses		(0.8	)		3.8			3.0			(15.8	)		30.8			15.0
Effect of Foreign Exchange Rates		—			—			—			—			—			—
Balance at End of Period	$	169.1		$	129.2		$	298.3		$	179.6		$	137.9		$	317.5

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 September 30, 2014, and December 31, 2013.

	September 30, 2014						December 31, 2013
(In Millions)	Commercial		Personal		Total		Commercial		Personal		Total
Loans and Leases
Specifically Evaluated for Impairment	$	97.9	$	172.5	$	270.4	$	99.5	$	193.9	$	293.4
Evaluated for Inherent Impairment		13,770.7		16,678.8		30,449.5		12,520.5		16,571.6		29,092.1
Total Loans and Leases		13,868.6		16,851.3		30,719.9		12,620.0		16,765.5		29,385.5
Allowance for Loans and Leases
Specifically Evaluated for Impairment		8.6		0.9		9.5		8.1		2.3		10.4
Evaluated for Inherent Impairment		134.5		125.4		259.9		132.8		134.9		267.7
Allowance Assigned to Loans and Leases		143.1		126.3		269.4		140.9		137.2		278.1
Allowance for Unfunded Exposures
Commitments and Standby Letters of Credit		26.0		2.9		28.9		27.1		2.7		29.8
Total Allowance for Credit Losses	$	169.1	$	129.2	$	298.3	$	168.0	$	139.9	$	307.9

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Goodwill and Other Intangibles

9 Months Ended

Sep. 30, 2014

Goodwill and Other Intangibles

8. Goodwill and Other Intangibles — The carrying amounts of goodwill, reflecting the effect of foreign exchange rates on non-U.S. dollar denominated balances, by business unit at September 30, 2014, and December 31, 2013, were as follows:

(In Millions)	September 30, 2014		December 31, 2013
Corporate & Institutional Services	$	466.6	$	469.2
Wealth Management		71.5		71.5
Total Goodwill	$	538.1	$	540.7

The gross carrying amount and accumulated amortization of other intangible assets subject to amortization as of September 30, 2014, and December 31, 2013, were as follows:

(In Millions)	September 30, 2014		December 31, 2013
Gross Carrying Amount	$	193.4	$	198.2
Less: Accumulated Amortization		127.6		115.2
Net Book Value	$	65.8	$	83.0

Other intangible assets consist primarily of the value of acquired client relationships and are included within other assets on the consolidated balance sheet. Amortization expense related to other intangible assets totaled $4.8 million and $14.7 million for the three and nine months ended September 30, 2014, respectively, and $5.2 million and $15.5 million for the three and nine months ended September 30, 2013, respectively. Amortization for the remainder of 2014 and for the years 2015, 2016, 2017, and 2018 is estimated to be $4.8 million, $11.5 million, $9.0 million, $8.9 million and $8.2 million, respectively.

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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, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 Contract	Sep. 30, 2013 Contract	Sep. 30, 2014 Contract	Sep. 30, 2013 Contract
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases	34	45	108	146
Recorded Investment	$ 21.3	$ 29.5	$ 29.5	$ 91.9
Unpaid Principal Balance	22.5	36.4	32.3	105.5
Commercial
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases	6	7	9	18
Recorded Investment	3.3	22.8	4.2	27.9
Unpaid Principal Balance	3.8	25.0	4.9	32.9
Commercial | Commercial and Institutional
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases	1		3	7
Recorded Investment	0.4		0.7	0.5
Unpaid Principal Balance	0.4		0.8	1.0
Commercial | Commercial Real Estate Portfolio Segment
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases	5	7	6	11
Recorded Investment	2.9	22.8	3.5	27.4
Unpaid Principal Balance	3.4	25.0	4.1	31.9
Personal
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases	28	38	99	128
Recorded Investment	18.0	6.7	25.3	64.0
Unpaid Principal Balance	18.7	11.4	27.4	72.6
Personal | Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases	28	38	96	122
Recorded Investment	18.0	6.7	25.3	51.2
Unpaid Principal Balance	18.7	11.4	27.1	59.8
Personal | Private Client
Financing Receivable, Modifications [Line Items]
Number of Loans and Leases			3	6
Recorded Investment				12.8
Unpaid Principal Balance			$ 0.3	$ 12.8

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Derivative Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Available for Sale Investment Securities	Sep. 30, 2014 Foreign Exchange Contracts	Sep. 30, 2014 Net Investment Hedges	Dec. 31, 2013 Net Investment Hedges	Sep. 30, 2014 Client Related and Trading	Dec. 31, 2013 Client Related and Trading
Derivative [Line Items]
Derivative assets recorded on the consolidated balance sheet, reduced as a result of master netting agreements	$ 2,200,000,000		$ 2,200,000,000		$ 1,200,000,000
Derivative liabilities recorded on the consolidated balance sheet, reduced as a result of master netting agreements	2,200,000,000		2,200,000,000		1,200,000,000
Reduction in derivative assets due to cash collateral received from derivative counterparties	207,400,000		207,400,000		210,700,000
Reduction in derivative liabilities due to cash collateral deposited with derivative counterparties	601,300,000		601,300,000		767,700,000
This amount represents additional cash collateral received from derivative counterparties not offset against derivative assets	42,000,000		42,000,000		36,400,000
This amount represents additional cash collateral deposited with derivative counterparties not offset against derivative liabilities	51,300,000		51,300,000		39,300,000
Securities posted as collateral	27,500,000		27,500,000		27,600,000
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position	113,400,000		113,400,000		257,300,000
Collateral deposited with derivative counterparties for derivatives instruments with credit-risk-related contingent features that are in a liability position	41,500,000		41,500,000		197,000,000
Termination payments that could have been required for derivative instruments with credit-risk-related contingent features	71,900,000		71,900,000		60,300,000
Percentage of derivatives outstanding related to client-related and trading activities										0.97%	0.97%
Sterling denominated debt designated as hedges of foreign exchange risk								250,400,000	259,100,000
Changes recorded in the fair value of the hedged items in a fair value hedge	0	300,000	0	900,000
The net gain/loss recognized in earnings during the period representing the amount of hedge ineffectiveness for fair value hedges of available for sale investment securities, senior notes, or subordinated debt	0	300,000	0	800,000
Maximum length of time being hedged for exposure to variability in future cash flows of forecasted foreign currency denominated transactions			23 months
The net gain/loss recognized in earnings during the period representing the amount of hedge ineffectiveness cash flow hedges	0	0	0	0
Net foreign exchange contract gains (losses) reclassified from AOCI	0	0	0	0
Estimated net gain (loss) to be reclassified into earnings within the next twelve months relating to cash flow hedges						2,200,000	(1,800,000)
Ineffectiveness from net investment hedges	$ 0	$ 0	$ 0	$ 0

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Allowances for Credit Losses and Recorded Investments in Loans and Leases by Segment (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Specifically Evaluated for Impairment	$ 270.4		$ 293.4
Evaluated for Inherent Impairment	30,449.5		29,092.1
Total Loans and Leases	30,719.9		29,385.5
Specifically Evaluated for Impairment	9.5		10.4
Evaluated for Inherent Impairment	259.9		267.7
Allowance Assigned to Loans and Leases	269.4		278.1
Allowance for Undrawn Exposures Commitments and Standby Letters of Credit	28.9		29.8
Total Allowance for Credit Losses	298.3	303.5	307.9	317.5	320.7	327.6
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Specifically Evaluated for Impairment	97.9		99.5
Evaluated for Inherent Impairment	13,770.7		12,520.5
Total Loans and Leases	13,868.6		12,620.0
Specifically Evaluated for Impairment	8.6		8.1
Evaluated for Inherent Impairment	134.5		132.8
Allowance Assigned to Loans and Leases	143.1		140.9
Allowance for Undrawn Exposures Commitments and Standby Letters of Credit	26.0		27.1
Total Allowance for Credit Losses	169.1	168.7	168.0	179.6	184.1	194.2
Personal
Financing Receivable, Allowance for Credit Losses [Line Items]
Specifically Evaluated for Impairment	172.5		193.9
Evaluated for Inherent Impairment	16,678.8		16,571.6
Total Loans and Leases	16,851.3		16,765.5
Specifically Evaluated for Impairment	0.9		2.3
Evaluated for Inherent Impairment	125.4		134.9
Allowance Assigned to Loans and Leases	126.3		137.2
Allowance for Undrawn Exposures Commitments and Standby Letters of Credit	2.9		2.7
Total Allowance for Credit Losses	$ 129.2	$ 134.8	$ 139.9	$ 137.9	$ 136.6	$ 133.4

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Impaired Loans by Segment and Class (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 270.4				$ 270.4				$ 293.4
Unpaid principal balance	329.9				329.9				360.5
Specific allowance	9.5				9.5				10.4
Average recorded investment	265.5	[1]	294.7	[1]	279.3	[1]	278.3	[1]
Interest income recognized	1.2		0.8		3.1		2.8
Commercial
Financing Receivable, Impaired [Line Items]
Recorded Investment	97.9				97.9				99.5
Unpaid principal balance	112.6				112.6				123.2
Specific allowance	8.6				8.6				8.1
Average recorded investment	91.0	[1]	102.5	[1]	93.3	[1]	100.6	[1]
Interest income recognized	0.4		0.3		1.0		0.9
Commercial | Commercial and Institutional
Financing Receivable, Impaired [Line Items]
With no related specific reserve, recorded investment	11.6				11.6				12.2
With a related specific reserve, recorded investment	20.5				20.5				9.6
With no related specific reserve, unpaid principal balance	14.6				14.6				18.1
With a related specific reserve, unpaid principal balance	20.5				20.5				12.1
Specific allowance	5.1				5.1				3.6
With no related specific reserve, average recorded investment	12.6	[1]	10.7	[1]	11.5	[1]	11.3	[1]
With a related specific reserve, average recorded investment	11.9	[1]	14.1	[1]	10.6	[1]	12.5	[1]
With no related specific reserve, interest income recognized	0.1				0.1		0.1
With a related specific reserve, interest income recognized
Commercial | Commercial Real Estate
Financing Receivable, Impaired [Line Items]
With no related specific reserve, recorded investment	49.2				49.2				46.6
With a related specific reserve, recorded investment	12.4				12.4				26.7
With no related specific reserve, unpaid principal balance	54.9				54.9				57.1
With a related specific reserve, unpaid principal balance	18.4				18.4				31.5
Specific allowance	3.5				3.5				4.5
With no related specific reserve, average recorded investment	48.5	[1]	42.0	[1]	46.0	[1]	40.6	[1]
With a related specific reserve, average recorded investment	13.7	[1]	31.2	[1]	20.9	[1]	31.6	[1]
With no related specific reserve, interest income recognized	0.2		0.2		0.7		0.6
With a related specific reserve, interest income recognized
Commercial | Lease Financing, net
Financing Receivable, Impaired [Line Items]
With no related specific reserve, recorded investment	4.2				4.2				4.4
With no related specific reserve, unpaid principal balance	4.2				4.2				4.4
With no related specific reserve, average recorded investment	4.3	[1]	4.5	[1]	4.3	[1]	4.6	[1]
With no related specific reserve, interest income recognized	0.1		0.1		0.2		0.2
Personal
Financing Receivable, Impaired [Line Items]
Recorded Investment	172.5				172.5				193.9
Unpaid principal balance	217.3				217.3				237.3
Specific allowance	0.9				0.9				2.3
Average recorded investment	174.5	[1]	192.2	[1]	186.0	[1]	177.7	[1]
Interest income recognized	0.8		0.5		2.1		1.9
Personal | Residential Real Estate
Financing Receivable, Impaired [Line Items]
With no related specific reserve, recorded investment	170.2				170.2				185.0
With a related specific reserve, recorded investment	1.3				1.3				8.1
With no related specific reserve, unpaid principal balance	214.5				214.5				227.8
With a related specific reserve, unpaid principal balance	1.5				1.5				8.7
Specific allowance	0.4				0.4				2.3
With no related specific reserve, average recorded investment	172.0	[1]	168.1	[1]	180.8	[1]	155.2	[1]
With a related specific reserve, average recorded investment	1.3	[1]	10.0	[1]	4.1	[1]	9.4	[1]
With no related specific reserve, interest income recognized	0.8		0.3		2.1		1.4
With a related specific reserve, interest income recognized
Personal | Private Client
Financing Receivable, Impaired [Line Items]
With no related specific reserve, recorded investment	0.1				0.1				0.8
With a related specific reserve, recorded investment	0.9				0.9
With no related specific reserve, unpaid principal balance	0.4				0.4				0.8
With a related specific reserve, unpaid principal balance	0.9				0.9
Specific allowance	0.5				0.5
With no related specific reserve, average recorded investment	0.3	[1]	13.3	[1]	0.6	[1]	12.0	[1]
With a related specific reserve, average recorded investment	0.9	[1]	0.8	[1]	0.5	[1]	1.1	[1]
With no related specific reserve, interest income recognized			0.2				0.5
With a related specific reserve, interest income recognized

[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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Types of Risk Management Derivative Instruments Not Formally Designated as Hedges and Their Notional Amounts and Fair Values (Detail) (Nondesignated, Foreign Exchange Contracts, USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Nondesignated | Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	$ 192.3	$ 168.8
Fair Value Asset	0.3	1.0
Fair Value Liability	$ 3.5	$ 1.2

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Business Units (Tables)

9 Months Ended

Sep. 30, 2014

Earnings Contribution of Northern Trust's Business Units

The following tables show the earnings contributions of Northern Trust’s business units for the three and nine month periods ended September 30, 2014, and 2013.

Three Months Ended September 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2014			2013			2014			2013			2014			2013			2014			2013
Noninterest Income
Trust, Investment and Other Servicing Fees	$	399.9		$	359.8		$	318.3		$	288.2		$	—		$	—		$	718.2		$	648.0
Foreign Exchange Trading Income		44.4			61.8			2.0			1.0			—			—			46.4			62.8
Other Noninterest Income		42.8			44.3			20.9			54.3			1.3			0.8			65.0			99.4
Net Interest Income*		78.4			70.1			131.2			136.3			46.6			38.4			256.2			244.8
Revenue*		565.5			536.0			472.4			479.8			47.9			39.2			1,085.8			1,055.0
Provision for Credit Losses		0.9			0.4			(0.9	)		4.6			—			—			—			5.0
Noninterest Expense		429.6			412.0			312.1			297.3			33.0			31.4			774.7			740.7
Income before Income Taxes*		135.0			123.6			161.2			177.9			14.9			7.8			311.1			309.3
Provision (Benefit) for Income Taxes*		42.4			38.8			60.7			67.0			3.5			(3.0	)		106.6			102.8
Net Income	$	92.6		$	84.8		$	100.5		$	110.9		$	11.4		$	10.8		$	204.5		$	206.5
Percentage of Consolidated Net Income		45	%		41	%		49	%		54	%		6	%		5	%		100	%		100	%
Average Assets	$	59,907.1		$	53,653.5		$	26,061.8		$	22,923.6		$	19,275.8		$	18,635.4		$	105,244.7		$	95,212.5

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $6.9 million for 2014 and $7.8 million for 2013.

Nine Months Ended September 30,	Corporate & Institutional Services						Wealth Management						Treasury and Other						Total Consolidated
($ In Millions)	2014			2013			2014			2013			2014			2013			2014			2013
Noninterest Income
Trust, Investment and Other Servicing Fees	$	1,174.5		$	1,072.7		$	930.1		$	863.3		$	—		$	—		$	2,104.6		$	1,936.0
Foreign Exchange Trading Income		143.2			189.8			6.2			3.8			—			—			149.4			193.6
Other Noninterest Income		134.3			130.1			66.7			95.8			4.5			5.4			205.5			231.3
Net Interest Income*		228.8			200.2			398.8			425.3			136.4			81.0			764.0			706.5
Revenue*		1,680.8			1,592.8			1,401.8			1,388.2			140.9			86.4			3,223.5			3,067.4
Provision for Credit Losses		4.5			(1.1	)		(1.5	)		16.1			—			—			3.0			15.0
Noninterest Expense		1,299.5			1,206.7			960.3			900.9			93.9			91.7			2,353.7			2,199.3
Income (loss) before Income Taxes*		376.8			387.2			443.0			471.2			47.0			(5.3	)		866.8			853.1
Provision (Benefit) for Income Taxes*		113.3			123.0			166.9			177.8			18.8			(9.3	)		299.0			291.5
Net Income	$	263.5		$	264.2		$	276.1		$	293.4		$	28.2		$	4.0		$	567.8		$	561.6
Percentage of Consolidated Net Income		46	%		47	%		49	%		52	%		5	%		1	%		100	%		100	%
Average Assets	$	59,061.3		$	52,323.8		$	23,613.4		$	22,863.1		$	20,281.1		$	18,036.6		$	102,955.8		$	93,223.5

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Reconciliation of Amortized Cost to Fair Values of Securities Available for Sale (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Investment Holdings [Line Items]
Amortized Cost	$ 28,046.2	$ 28,382.3
Gross Unrealized Gains	125.0	174.2
Gross Unrealized Losses	63.5	163.7
Fair Value	28,107.7	28,392.8
U.S. Government
Investment Holdings [Line Items]
Amortized Cost	3,395.1	1,896.7
Gross Unrealized Gains	16.0	22.6
Gross Unrealized Losses	1.5	1.4
Fair Value	3,409.6	1,917.9
Obligations of States and Political Subdivisions
Investment Holdings [Line Items]
Amortized Cost	4.5	4.5
Gross Unrealized Gains	0.1	0.1
Fair Value	4.6	4.6
U.S. Government Sponsored Agency
Investment Holdings [Line Items]
Amortized Cost	16,114.2	17,495.2
Gross Unrealized Gains	85.4	80.7
Gross Unrealized Losses	25.2	47.9
Fair Value	16,174.4	17,528.0
Non-U.S. Government
Investment Holdings [Line Items]
Amortized Cost	309.3	307.0
Gross Unrealized Gains	1.2	3.6
Fair Value	310.5	310.6
Corporate Debt
Investment Holdings [Line Items]
Amortized Cost	3,393.5	3,615.2
Gross Unrealized Gains	4.7	10.5
Gross Unrealized Losses	33.4	101.2
Fair Value	3,364.8	3,524.5
Covered Bonds
Investment Holdings [Line Items]
Amortized Cost	1,966.9	1,898.9
Gross Unrealized Gains	12.2	50.9
Gross Unrealized Losses	0.2	5.9
Fair Value	1,978.9	1,943.9
Supranational and Non-U.S. Agency Bonds
Investment Holdings [Line Items]
Amortized Cost	360.0	410.0
Gross Unrealized Gains	1.4	1.7
Gross Unrealized Losses	1.2	1.7
Fair Value	360.2	410.0
Residential Mortgage-Backed
Investment Holdings [Line Items]
Amortized Cost	18.8	52.4
Gross Unrealized Gains	0.1	0.1
Gross Unrealized Losses	1.3	4.4
Fair Value	17.6	48.1
Other Asset-Backed
Investment Holdings [Line Items]
Amortized Cost	2,232.0	2,390.8
Gross Unrealized Gains	1.3	1.4
Gross Unrealized Losses	0.2	0.4
Fair Value	2,233.1	2,391.8
Auction Rate Securities
Investment Holdings [Line Items]
Amortized Cost	83.4	97.5
Gross Unrealized Gains	2.3	2.2
Gross Unrealized Losses	0.5	0.8
Fair Value	85.2	98.9
Others
Investment Holdings [Line Items]
Amortized Cost	168.5	214.1
Gross Unrealized Gains	0.3	0.4
Fair Value	$ 168.8	$ 214.5

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Net Interest Income

9 Months Ended

Sep. 30, 2014

Net Interest Income

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

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014		2013
Interest Income
Loans and Leases	$	184.8	$	185.4	$	553.5	$	558.5
Securities — Taxable		65.1		60.9		198.0		167.6
— Non-Taxable		1.6		2.7		5.7		9.0
Interest-Bearing Deposits with Banks		30.9		36.3		96.6		105.8
Federal Reserve Deposits and Other		11.4		5.8		29.2		12.2
Total Interest Income		293.8		291.1		883.0		853.1
Interest Expense
Deposits		21.6		25.8		64.1		79.9
Federal Funds Purchased		0.5		0.4		1.1		1.0
Securities Sold Under Agreements to Repurchase		0.1		0.1		0.3		0.3
Other Borrowings		0.9		0.8		2.4		2.5
Senior Notes		11.6		18.4		42.8		56.9
Long-Term Debt		9.2		8.0		29.0		27.5
Floating Rate Capital Debt		0.6		0.6		1.7		1.8
Total Interest Expense		44.5		54.1		141.4		169.9
Net Interest Income	$	249.3	$	237.0	$	741.6	$	683.2

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Contingent Liabilities

9 Months Ended

Sep. 30, 2014

Contingent Liabilities

18. Contingent Liabilities — Standby Letters of Credit and Indemnifications. 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 $4.3 billion at September 30, 2014, and $4.5 billion at December 31, 2013.

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 Senior Credit Committee. In connection with these activities, Northern Trust has issued indemnifications to certain clients against certain losses that are a direct result of a borrower’s failure to return securities when due, should the value of such securities exceed the value of the collateral required to be posted. Borrowers are required to collateralize fully securities received with cash or marketable securities. As securities are loaned, collateral is maintained at a minimum of 100% of the fair value of the securities plus accrued interest. The collateral is revalued on a daily basis. The amount of securities loaned subject to indemnification was $99.9 billion at September 30, 2014, and $82.7 billion at December 31, 2013. 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 at September 30, 2014, or December 31, 2013, 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”. Thus, references to the upper end of the range of reasonably possible loss for matters in which the Corporation is able to estimate a range of reasonably possible loss mean the upper end of the range of loss for matters for which the Corporation believes the risk of loss is more than remote but less than likely.

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 September 30, 2014, the Corporation has estimated the upper end of the range of reasonably possible losses for these matters to be approximately $130 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.

As previously disclosed, a number of participants in our securities lending program, which is associated with the Corporation’s asset servicing business, have commenced either individual lawsuits or purported class actions in which they claim, among other things, that we 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 the fourth quarter of 2013, Northern Trust recorded a $19.2 million pre-tax charge in connection with an agreement to resolve claims related to two of these lawsuits. The settlement is not final as it requires further documentation, signed agreements and court approval. Other lawsuits related to securities lending are not part of the proposed settlement, and remain pending.

In April 2014 Northern Trust received a subpoena from the U.S. Securities and Exchange Commission (SEC) seeking documents related to Northern Trust’s securities lending activities. Northern Trust is cooperating with the SEC in this investigation.

Visa Membership. Northern Trust, as a member of Visa U.S.A. Inc. and in connection with the 2007 initial public offering of Visa Inc. (Visa), received shares of restricted stock in Visa. As of September 30, 2014, the Visa shares held by Northern Trust are recorded at their original cost basis of zero and have restrictions as to their sale or transfer.

Northern Trust is obligated to indemnify Visa for losses resulting from certain indemnified litigation relating to interchange fees and has been required to recognize, at its estimated fair value in accordance with GAAP, a guarantee liability arising from such litigation that has not yet settled. During 2007, Northern Trust recorded liabilities relating to Visa indemnified litigation. Subsequently, Visa established an escrow account to cover the settlements of, or judgments in, indemnified litigation. The fundings by Visa of its escrow account resulted in reductions of Northern Trust’s indemnification liability. Northern Trust’s indemnification liability was fully eliminated as of December 31, 2011. On October 19, 2012, Visa signed a settlement agreement with plaintiff representatives for binding settlement of the indemnified 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.

While the ultimate resolution of the indemnified litigation and the timing for removal of selling restrictions on the Visa shares are highly uncertain, Northern Trust anticipates that the value of its Visa shares will be adequate to offset any remaining indemnification obligations related to Visa litigation.

Contingent Purchase Consideration. In connection with an acquisition consummated in 2011, contingent consideration was recorded relating to certain performance-related purchase price adjustments. The fair value of the contingent consideration was $55.4 million at December 31, 2013. In April 2014 Northern Trust made a payment of $55.3 million to extinguish the contingent consideration liability at the value agreed by the parties.

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Offsetting of Derivative Assets and of Securities Purchased Under Agreements to Resell Within Consolidated Balance Sheet (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Other Assets (excluding Derivative Assets)	$ 3,230.9	$ 3,029.4
Federal Funds Sold	$ 10.0	$ 29.6

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Valuation Techniques, Significant Unobservable Inputs, Quantitative Information Non-recurring Basis (Detail) (Fair Value, Inputs, Level 3, USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instrument, fair value	$ 26.6
Valuation Technique	Market Approach
Unobservable Input	Discount to reflect realizable value
Other Real Estate Owned
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial Instrument, fair value	$ 1.5
Valuation Technique	Market Approach
Unobservable Input	Discount to reflect realizable value
Lower Limit | Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range of Discounts Applied	15.00%
Lower Limit | Other Real Estate Owned
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range of Discounts Applied	15.00%
Upper Limit | Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range of Discounts Applied	25.00%
Upper Limit | Other Real Estate Owned
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Range of Discounts Applied	20.00%

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Offsetting of Assets and Liabilities (Tables)

9 Months Ended

Sep. 30, 2014

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

The following tables provide information regarding the offsetting of derivative assets and securities purchased under agreements to resell within the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

September 30, 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 Over the Counter (OTC)	$	3,265.0	$	2,085.0	$	1,180.0	$	—	$	1,180.0
Interest Rate Swaps OTC		183.7		31.5		152.2		—		152.2
Interest Rate Swaps Exchange Cleared		29.8		7.4		22.4		—		22.4
Cross Product Netting Adjustment		—		27.1		—		—		—
Cross Product Collateral Adjustment		—		207.4		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,478.5		2,358.4		1,120.1		—		1,120.1
Total Derivatives Not Subject to a Master Netting Arrangement		938.8		—		938.8		—		938.8
Total Derivatives		4,417.3		2,358.4		2,058.9		—		2,058.9
Securities Purchased under Agreements to Resell (2)	$	1,000.0	$	—	$	1,000.0	$	1,000.0	$	—

December 31, 2013
(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	$	2,612.5	$	1,073.3	$	1,539.2	$	—	$	1,539.2
Interest Rate Swaps OTC		228.8		47.5		181.3		—		181.3
Interest Rate Swaps Exchange Cleared		9.1		9.1		—		—		—
Cross Product Netting Adjustment		—		28.4		—		—		—
Cross Product Collateral Adjustment		—		210.7		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		2,850.4		1,369.0		1,481.4		—		1,481.4
Total Derivatives Not Subject to a Master Netting Arrangement		253.2		—		253.2		—		253.2
Total Derivatives		3,103.6		1,369.0		1,734.6		—		1,734.6
Securities Purchased under Agreements to Resell (2)	$	500.0	$	—	$	500.0	$	500.0	$	—

(1) Derivative assets are reported in other assets in the consolidated balance sheet. Other assets (excluding derivative assets) totaled $3,230.9 million and $3,029.4 million as of September 30, 2014, and December 31, 2013, 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 sheet. Federal funds sold totaled $10.0 million and $29.6 million as of September 30, 2014, and December 31, 2013, respectively.

(3) Northern Trust did not possess any cash collateral that was not offset in the consolidated balance sheet that could have been used to offset the net amounts presented in the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

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

The following tables provide information regarding the offsetting of derivative liabilities and securities sold under agreements to repurchase within the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

September 30, 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	$	3,404.3	$	2,085.0	$	1,319.3	$	—	$	1,319.3
Interest Rate Swaps OTC		116.1		31.5		84.6		—		84.6
Interest Rate Swaps Exchange Cleared		7.4		7.4		—		—		—
Cross Product Netting Adjustment		—		27.1		—		—		—
Cross Product Collateral Adjustment		—		601.3		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		3,527.8		2,752.3		775.5		—		775.5
Total Derivatives Not Subject to a Master Netting Arrangement		737.3		—		737.3		—		737.3
Total Derivatives		4,265.1		2,752.3		1,512.8		—		1,512.8
Securities Sold under Agreements to Repurchase	$	866.8	$	—	$	866.8	$	866.8	$	—

December 31, 2013
(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	$	2,039.0	$	1,073.3	$	965.7	$	—	$	965.7
Interest Rate Swaps OTC		163.7		47.5		116.2		—		116.2
Interest Rate Swaps Exchange Cleared		31.5		9.1		22.4		—		22.4
Cross Product Netting Adjustment		—		28.4		—		—		—
Cross Product Collateral Adjustment		—		767.7		—		—		—
Total Derivatives Subject to a Master Netting Arrangement		2,234.2		1,926.0		308.2		—		308.2
Total Derivatives Not Subject to a Master Netting Arrangement		866.7		—		866.7				866.7
Total Derivatives		3,100.9		1,926.0		1,174.9		—		1,174.9
Securities Sold under Agreements to Repurchase	$	917.3	$	—	$	917.3	$	917.3	$	—

(1) Derivative liabilities are reported in other liabilities in the consolidated balance sheet. Other liabilities (excluding derivative liabilities) totaled $2,591.5 million and $2,338.4 million as of September 30, 2014, and December 31, 2013, respectively.

(2) Northern Trust did not place any cash collateral with counterparties that was not offset in the consolidated balance sheet that could have been used to offset the net amounts presented in the consolidated balance sheet as of September 30, 2014, and December 31, 2013.

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Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net Income	$ 204.5	$ 206.5	$ 567.8	$ 561.6
Other Comprehensive Income (Net of Tax and Reclassifications)
Net Unrealized Gains (Losses) on Securities Available for Sale	(5.7)	5.8	32.3	(74.4)
Net Unrealized Gains (Losses) on Cash Flow Hedges	(7.4)	4.3	(6.4)	1.2
Foreign Currency Translation Adjustments	(3.6)	(4.4)	(10.5)	(2.8)
Pension and Other Postretirement Benefit Adjustments	3.5	7.1	10.5	21.1
Other Comprehensive Income (Loss)	(13.2)	12.8	25.9	(54.9)
Comprehensive Income	$ 191.3	$ 219.3	$ 593.7	$ 506.7

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Types and Classifications of Derivative Instruments Designated as Hedges (Detail) (Asset And Liability Management, USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Notional Value	$ 6,669.3	$ 6,545.8
Fair Value Asset	184.0	135.1
Fair Value Liability	40.2	136.5
FAIR VALUE HEDGES | Senior Notes and Long- Term Subordinated Debt | Interest Rate Swap Contracts
Derivative [Line Items]
Notional Value	1,250.0	1,250.0
Fair Value Asset	92.4	83.6
Fair Value Liability	2.0	33.4
FAIR VALUE HEDGES | Available for Sale Investment Securities | Interest Rate Swap Contracts
Derivative [Line Items]
Notional Value	2,939.7	3,296.9
Fair Value Asset	20.8	31.5
Fair Value Liability	24.9	44.8
CASH FLOW HEDGES | Forecasted Foreign Currency Denominated Transactions | Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	341.0	314.0
Fair Value Asset	5.2	10.2
Fair Value Liability	9.5	5.5
CASH FLOW HEDGES | Available for Sale Investment Securities | Interest Rate Swap Contracts
Derivative [Line Items]
Notional Value	10.0
CASH FLOW HEDGES | Available for Sale Investment Securities | Interest Rate Option Contracts
Derivative [Line Items]
Notional Value	375.0
Fair Value Asset	0.1
Fair Value Liability	0.7
Net Investment Hedges | Net Investments in Non-U.S. Affiliates | Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	1,753.6	1,684.9
Fair Value Asset	65.5	9.8
Fair Value Liability	$ 3.1	$ 52.8

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Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2014

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, 2016. Northern Trust is currently assessing the impact of adoption of ASU 2014-09.

In August 2014, the FASB issued ASU No. 2014-14, “Receivables — Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force).” This ASU requires that a mortgage loan be derecognized and a separate receivable, measured based on the amount of the loan balance expected to be recovered from the guarantor, be recognized upon foreclosure if certain conditions are met. This ASU is effective for interim and annual reporting periods beginning after December 15, 2014. The adoption of this ASU is not expected to significantly impact Northern Trust’s consolidated financial position or results of operations.

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Credit-Related Losses Recognized in Earnings on Debt Securities Other-Than-Temporarily Impaired (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Cumulative Credit-Related Losses on Securities Held - Beginning of Period	$ 12.7	$ 8.8	$ 42.3	$ 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	(1.8)	(1.8)	(33.5)
Cumulative Credit-Related Losses on Securities Held - End of Period	$ 10.9	$ 10.9	$ 8.8	$ 8.8

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Compensation Expense for Share-Based Payment Arrangements and Associated Tax Impacts (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	$ 18.0	$ 17.9	$ 61.3	$ 56.7
Tax Benefits Recognized	6.8	6.8	23.0	21.3
Restricted Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	12.7	12.1	41.7	36.4
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	2.2	3.7	10.7	14.9
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	$ 3.1	$ 2.1	$ 8.9	$ 5.4

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Other Intangible Assets Subject to Amortization (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 193.4	$ 198.2
Less: Accumulated Amortization	127.6	115.2
Net Book Value	$ 65.8	$ 83.0

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2014

Derivative Financial Instruments

19. 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 credit default swap contracts.

Northern Trust’s primary risks associated with these instruments is the possibility that interest rates, foreign exchange rates, or credit spreads 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 or deposited. The amount of credit risk will increase or decrease during the lives of the instruments as interest rates, foreign exchange rates, or credit spreads 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 sheet 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 statement 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 sheet were each reduced by $2.2 billion as of September 30, 2014, and by $1.2 billion as of December 31, 2013, as a result of master netting arrangements and similar agreements in place. Derivative assets and liabilities recorded at September 30, 2014, also reflect reductions of $207.4 million and $601.3 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 $210.7 million and $767.7 million, respectively, at December 31, 2013. Additional cash collateral received from and deposited with derivative counterparties totaling $42.0 million and $51.3 million, respectively, as of September 30, 2014, and $36.4 million and $39.3 million, respectively, as of December 31, 2013, were not offset against derivative assets and liabilities on the consolidated balance sheet as the amounts exceeded the net derivative positions with those counterparties. Northern Trust centrally clears interest rate derivative instruments that are addressed under Title VII of the Dodd-Frank Wall Street Reform and Consumer Protection Act. Securities posted as collateral for these transactions totaled $27.5 million and $27.6 million at September 30, 2014, and December 31, 2013, respectively, are not offset against derivative assets and liabilities on the consolidated balance sheet, 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 $113.4 million and $257.3 million at September 30, 2014, and December 31, 2013, respectively. Cash collateral amounts deposited with derivative counterparties on those dates included $41.5 million and $197.0 million, respectively, posted against these liabilities, resulting in a net maximum amount of termination payments that could have been required at September 30, 2014, and December 31, 2013 of $71.9 million and $60.3 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 on behalf of its clients and also may utilize such contracts to reduce or eliminate the exposure to changes in the cash flows or fair value of hedged assets or liabilities due to changes in interest rates. Interest rate option contracts may include caps, floors, collars, and swaptions, and provide for the transfer or reduction of interest rate risk, typically in exchange for a fee. Northern Trust enters into option contracts primarily as a seller of interest rate protection to clients. Northern Trust receives a fee at the outset of the agreement for the assumption of the risk of an unfavorable change in interest rates.

This assumed interest rate risk is then mitigated by entering into an offsetting position with an outside counterparty. Northern Trust may also purchase or enter into option contracts for risk management purposes including to reduce the exposure to changes in the cash flows of hedged assets due to changes in interest rates.

Credit default swap contracts are agreements to transfer credit default risk from one party to another in exchange for a fee. Northern Trust enters into credit default swaps with outside counterparties where the counterparty agrees to assume the underlying credit exposure of a specific Northern Trust commercial loan or loan commitment.

Client-Related and Trading Derivative Instruments. Approximately 97% of Northern Trust’s derivatives outstanding at September 30, 2014, and December 31, 2013, 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 sheet. 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.

	September 30, 2014						December 31, 2013
	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	270,022.4	$	4,132.8	$	4,125.5	$	243,135.0	$	2,844.7	$	2,846.2
Interest Rate Contracts		5,048.9		100.2		95.9		5,001.7		122.8		117.0
Total	$	275,071.3	$	4,233.0	$	4,221.4	$	248,136.7	$	2,967.5	$	2,963.2

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 statement of income for the three and nine months ended September 30, 2014, and 2013.

	Location of Derivative Gain/(Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
		Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)		2014		2013		2014		2013
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	46.4	$	62.8	$	149.4	$	193.6
Interest Rate Contracts	Security Commissions and Trading Income		0.6		4.4		4.6		11.4
Total		$	47.0	$	67.2	$	154.0	$	205.0

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

			September 30, 2014						December 31, 2013
(In Millions)	Derivative Instrument	Risk Classification	Notional Value		Fair Value				Notional Value		Fair Value
					Asset		Liability				Asset		Liability
Fair Value Hedges
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate	$	2,939.7	$	20.8	$	24.9	$	3,296.9	$	31.5	$	44.8
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Rate		1,250.0		92.4		2.0		1,250.0		83.6		33.4
Cash Flow Hedges
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		341.0		5.2		9.5		314.0		10.2		5.5
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate		10.0		—		—		—		—		—
Available for Sale Investment Securities	Interest Rate Option Contracts	Interest Rate		375.0		0.1		0.7		—		—		—
Net Investment Hedges
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		1,753.6		65.5		3.1		1,684.9		9.8		52.8
Total			$	6,669.3	$	184.0	$	40.2	$	6,545.8	$	135.1	$	136.5

In addition to the above, Sterling denominated debt, totaling $250.4 million and $259.1 million at September 30, 2014, and December 31, 2013, respectively, was designated as a hedge of the foreign exchange risk associated with the net investment in certain non-U.S. affiliates.

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 statement of income related to fair value hedges for the three and nine months ended September 30, 2014, and 2013.

(In Millions)	Derivative Instrument	Location of Derivative Gain/(Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
			Three Months Ended September 30,					Nine Months Ended September 30,
			2014		2013			2014			2013
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Income	$	5.1	$	(16.4	)	$	(21.9	)	$	21.6
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Expense		5.8		(3.6	)		66.0			(16.1	)
Total			$	10.9	$	(20.0	)	$	44.1		$	5.5

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 as the gain or loss. For fair value hedges that do not qualify for the “shortcut” method of accounting, Northern Trust utilizes regression analysis, a “long-haul” method of accounting, in assessing whether the hedging relationships are highly effective at inception and on an ongoing basis. There was no ineffectiveness or changes in the fair value of hedged items recognized in earnings for fair value hedges during the three and nine months ended September 30, 2014. There were losses of $0.3 million and $0.9 million recorded within the fair values of hedged items for such “long-haul” hedges during the three and nine months ended September 30, 2013, respectively. There were losses of $0.3 million and $0.8 million from ineffectiveness recorded during the three and nine months ended September 30, 2013, respectively, in connection with the hedging of available for sale investment securities, senior notes, and subordinated debt. Ineffectiveness resulting from fair value hedges is recorded in either interest income or interest expense.

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. When the hedged forecasted transaction impacts earnings, balances in AOCI are reclassified to 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 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 nine months ended September 30, 2014, and 2013. As of September 30, 2014, 23 months is the maximum length of time over which the exposure to variability in future cash flows of forecasted foreign currency denominated transactions is 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 nine months ended September 30, 2014, and 2013.

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)				Interest Rate Option Contracts (Before Tax)
Three Months Ended September 30,	2014			2013			2014		2013		2014			2013
Net Gain/(Loss) Recognized in AOCI	$	(6.9	)	$	5.3		$	—	$	—	$	(0.7	)	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Other Operating Income		0.7			—			—		—		—			—
Interest Income		—			—			—		—		0.1			—
Other Operating Expense		—			(1.1	)		—		—		—			—
Total	$	0.7		$	(1.1	)	$	—	$	—	$	0.1		$	—

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)				Interest Rate Option Contracts (Before Tax)
Nine Months Ended September 30,	2014			2013			2014		2013		2014			2013
Net Gain/(Loss) Recognized in AOCI	$	(5.8	)	$	(4.0	)	$	—	$	—	$	(0.7	)	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Other Operating Income		3.4			(1.8	)		—		—		—			—
Interest Income		—			—			—		—		0.1			—
Other Operating Expense		(0.2	)		(3.9	)		—		—		—			—
Total	$	3.2		$	(5.7	)	$	—	$	—	$	0.1		$	—

During the three and nine months ended September 30, 2014, and 2013, 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 $1.8 million will be reclassified into earnings within the next twelve months relating to cash flow hedges of foreign currency denominated transactions. It is estimated that a net gain of $2.2 million will be reclassified into earnings 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 nine months ended September 30, 2014, and 2013. Amounts recorded in AOCI are reclassified to earnings 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 nine months ended September 30, 2014, and 2013.

	Hedging Gain/(Loss) Recognized in OCI (Before Tax)
	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	2014		2013			2014		2013
Foreign Exchange Contracts	$	106.2	$	(73.8	)	$	74.3	$	(9.5	)
Sterling Denominated Subordinated Debt		13.7		(15.0	)		5.4		0.2
Total	$	119.9	$	(88.8	)	$	79.7	$	(9.3	)

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. Credit default swaps are entered into to manage the credit risk associated with certain loans and loan commitments. The following table identifies the types of risk management derivative instruments not formally designated as hedges and their notional amounts and fair values.

(In Millions)	September 30, 2014						December 31, 2013
	Notional Value		Fair Value				Notional Value		Fair Value
			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	192.3	$	0.3	$	3.5	$	168.8	$	1.0	$	1.2

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 statement of income for the three and nine months ended September 30, 2014, and 2013.

(In Millions)	Location of Derivative Gain/ (Loss) Recognized in Income	Amount of Derivative Gain/(Loss) Recognized in Income
		Three Months Ended September 30,					Nine Months Ended September 30,
		2014			2013		2014			2013
Credit Default Swap Contracts	Other Operating Income	$	—		$	—	$	—		$	(0.1	)
Foreign Exchange Contracts	Other Operating Income		(10.1	)		6.7		(9.3	)		(4.3	)
Total		$	(10.1	)	$	6.7	$	(9.3	)	$	(4.4	)

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Components of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (244.3)	$ (283.0)
Net Change	(13.2)	12.8	25.9	(54.9)
Ending Balance	(218.4)	(337.9)	(218.4)	(337.9)
Net Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			6.0	101.0
Net Change			32.3	(74.4)
Ending Balance	38.3	26.6	38.3	26.6
Net Unrealized Gains (Losses) on Cash Flow Hedge Designations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			2.9	(1.4)
Net Change			(6.4)	1.2
Ending Balance	(3.5)	(0.2)	(3.5)	(0.2)
Net Foreign Currency Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			7.1	10.5
Net Change			(10.5)	(2.8)
Ending Balance	(3.4)	7.7	(3.4)	7.7
Net Pension and Other Postretirement Benefit Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(260.3)	(393.1)
Net Change			10.5	21.1
Ending Balance	$ (249.8)	$ (372.0)	$ (249.8)	$ (372.0)

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Pension and Other Postretirement Plans (Tables)

9 Months Ended

Sep. 30, 2014

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 other postretirement plan for the three and nine months ended September 30, 2014, and 2013.

Net Periodic Pension Expense U.S. Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2014			2013			2014			2013
Service Cost	$	8.2		$	7.5		$	24.6		$	22.7
Interest Cost		11.1			10.5			33.3			31.6
Expected Return on Plan Assets		(24.4	)		(23.1	)		(73.3	)		(69.2	)
Amortization
Net Actuarial Loss		(0.1	)		10.3			(0.3	)		30.9
Prior Service Cost		5.4			(0.1	)		16.1			(0.3	)
Net Periodic Pension Expense	$	0.2		$	5.1		$	0.4		$	15.7

Net Periodic Pension Expense (Benefit) Non U.S. Plans	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2014			2013			2014			2013
Interest Cost	$	1.8		$	1.6		$	5.3		$	4.9
Expected Return on Plan Assets		(1.8	)		(1.5	)		(5.3	)		(4.6	)
Net Actuarial Loss Amortization		(0.4	)		0.2			(1.2	)		0.7
Net Periodic Pension Expense (Benefit)	$	(0.4	)	$	0.3		$	(1.2	)	$	1.0

Net Periodic Pension Expense Supplemental Plan	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2014		2013		2014		2013
Service Cost	$	0.8	$	0.4	$	2.3	$	1.2
Interest Cost		1.2		1.1		3.6		3.3
Amortization
Net Actuarial Loss		0.2		1.7		0.4		5.1
Prior Service Cost		1.5		0.2		4.4		0.4
Net Periodic Pension Expense	$	3.7	$	3.4	$	10.7	$	10.0

Net Periodic Postretirement Expense (Benefit) Other Postretirement Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2014			2013			2014			2013
Service Cost	$	—		$	—		$	0.1		$	0.1
Interest Cost		0.4			0.3			1.1			0.9
Amortization
Net Actuarial Gain		—			(0.3	)		—			(0.9	)
Prior Service Cost		(0.1	)		(0.7	)		(0.4	)		(2.2	)
Net Periodic Postretirement Expense (Benefit)	$	0.3		$	(0.7	)	$	0.8		$	(2.1	)

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Net Income Per Common Share Computations

9 Months Ended

Sep. 30, 2014

Net Income Per Common Share Computations

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

	Three Months Ended September 30,				Nine Months Ended September 30,
($ In Millions Except Per Common Share Information)	2014		2013		2014		2013
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding		235,701,076		239,930,074		236,301,789		239,614,868
Net Income	$	204.5	$	206.5	$	567.8	$	561.6
Less: Dividends on Preferred Stock		—		—		—		—
Net Income Applicable to Common Stock		204.5		206.5		567.8		561.6
Less: Earnings Allocated to Participating Securities		3.5		3.5		9.5		9.1
Earnings Allocated to Common Shares Outstanding		201.0		203.0		558.3		552.5
Basic Net Income Per Common Share	$	0.85	$	0.85	$	2.36	$	2.31
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding		235,701,076		239,930,074		236,301,789		239,614,868
Plus: Dilutive Effect of Share-based Compensation		2,036,053		1,400,578		1,873,907		1,242,829
Average Common and Potential Common Shares		237,737,129		241,330,652		238,175,696		240,857,697
Earnings Allocated to Common and Potential
Common Shares	$	201.0	$	203.0	$	558.4	$	552.5
Diluted Net Income Per Common Share		0.84		0.84		2.34		2.29

Note: Common stock equivalents totaling 1,071,654 and 1,671,849 for the three and nine months ended September 30, 2014, respectively, and 3,371,680 and 3,783,018 for the three and nine months ended September 30, 2013, respectively, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive.