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, 2011

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  ¨    x

240,996,807 Shares - $1.66 2/3 Par Value

(Shares of Common Stock Outstanding on September 30, 2011)

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements
CONSOLIDATED BALANCE SHEET	NORTHERN TRUST CORPORATION
	September 30 2011			December  31 2010
($ In Millions Except Share Information)	(Unaudited)
Assets
Cash and Due from Banks	$	4,336.6		$	2,818.0
Federal Funds Sold and Securities Purchased under Agreements to Resell		221.8			160.1
Interest-Bearing Deposits with Banks		18,944.2			15,351.3
Federal Reserve Deposits and Other Interest-Bearing		6,498.2			10,924.6
Securities
Available for Sale		28,439.3			19,901.9
Held to Maturity (Fair value of $847.2 and $941.8)		829.2			922.2
Trading Account		6.3			6.8
Total Securities		29,274.8			20,830.9
Loans and Leases
Commercial		12,219.3			11,613.4
Personal		16,472.1			16,518.6
Total Loans and Leases (Net of unearned income of $417.3 and $456.8)		28,691.4			28,132.0
Allowance for Credit Losses Assigned to Loans and Leases		(298.3	)		(319.6	)
Buildings and Equipment		492.1			504.5
Client Security Settlement Receivables		948.2			701.3
Goodwill		534.1			400.9
Other Assets		6,455.1			4,339.9
Total Assets	$	96,098.2		$	83,843.9
Liabilities
Deposits
Demand and Other Noninterest-Bearing	$	19,487.6		$	7,658.9
Savings and Money Market		14,538.6			14,208.7
Savings Certificates and Other Time		3,529.4			3,913.0
Non U.S. Offices – Noninterest-Bearing		3,374.8			2,942.7
– Interest-Bearing		37,583.6			35,472.4
Total Deposits		78,514.0			64,195.7
Federal Funds Purchased		737.8			3,691.7
Securities Sold Under Agreements to Repurchase		339.3			954.4
Other Borrowings		817.6			347.7
Senior Notes		2,133.5			1,896.1
Long-Term Debt		2,137.3			2,729.3
Floating Rate Capital Debt		276.9			276.9
Other Liabilities		3,989.0			2,921.8
Total Liabilities		88,945.4			77,013.6
Stockholders’ Equity
Common Stock, $1.66 2/3 Par Value; Authorized 560,000,000 shares; Outstanding shares of 240,996,807 and 242,268,903		408.6			408.6
Additional Paid-In Capital		962.9			920.0
Retained Earnings		6,240.3			5,972.1
Accumulated Other Comprehensive Loss		(232.5	)		(305.3	)
Treasury Stock (4,174,717 and 2,902,621 shares, at cost)		(226.5	)		(165.1	)
Total Stockholders’ Equity		7,152.8			6,830.3
Total Liabilities and Stockholders’ Equity	$	96,098.2		$	83,843.9

See accompanying notes to the consolidated financial statements.

2

CONSOLIDATED STATEMENT OF INCOME	NORTHERN TRUST CORPORATION
(UNAUDITED)

	Three Months Ended September 30						Nine Months Ended September 30
($ In Millions Except Per Share Information)	2011			2010			2011			2010
Noninterest Income
Trust, Investment and Other Servicing Fees	$	555.3		$	518.7		$	1,628.0		$	1,577.3
Foreign Exchange Trading Income		87.2			88.9			252.8			284.0
Treasury Management Fees		17.8			19.3			55.1			59.3
Security Commissions and Trading Income		13.9			14.9			44.8			43.5
Other Operating Income		42.5			27.7			120.4			104.1
Investment Security Gains (Losses), net (1)		(2.0	)		(13.5	)		(24.1	)		(13.3	)
Total Noninterest Income		714.7			656.0			2,077.0			2,054.9
Net Interest Income
Interest Income		347.1			330.2			1,053.8			962.4
Interest Expense		90.3			96.7			316.5			265.7
Net Interest Income		256.8			233.5			737.3			696.7
Provision for Credit Losses		17.5			30.0			42.5			120.0
Net Interest Income after Provision for Credit Losses		239.3			203.5			694.8			576.7
Noninterest Expense
Compensation		311.1			273.3			925.3			826.2
Employee Benefits		66.7			60.0			188.7			181.9
Outside Services		139.7			110.7			398.6			330.9
Equipment and Software		76.3			72.6			232.8			209.0
Occupancy		45.4			42.6			131.3			127.2
Visa Indemnification Benefit		—			—			(10.1	)		(12.7	)
Other Operating Expense		62.0			62.9			192.9			193.7
Total Noninterest Expense		701.2			622.1			2,059.5			1,856.2
Income before Income Taxes		252.8			237.4			712.3			775.4
Provision for Income Taxes		82.4			81.8			238.9			263.0
Net Income	$	170.4		$	155.6		$	473.4		$	512.4
Net Income Applicable to Common Stock	$	170.4		$	155.6		$	473.4		$	512.4
Per Common Share
Net Income – Basic	$	.70		$	.64		$	1.94		$	2.10
– Diluted		.70			.64			1.93			2.10
Average Number of Common Shares Outstanding – Basic		240,991,491			242,124,461			241,529,793			241,966,279
– Diluted		241,193,993			242,158,427			242,018,750			242,421,661

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME	NORTHERN TRUST CORPORATION
(UNAUDITED)

	Three Months Ended September 30						Nine Months Ended September 30
(In Millions)	2011			2010			2011			2010
Net Income	$	170.4		$	155.6		$	473.4		$	512.4
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)
Net Unrealized Gains on Securities Available for Sale		21.4			14.1			55.2			34.5
Net Unrealized Gains (Losses) on Cash Flow Hedges		(16.6	)		31.8			(9.6	)		42.2
Foreign Currency Translation Adjustments		1.2			.5			10.6			3.5
Pension and Other Postretirement Benefit Adjustments		4.8			2.8			16.6			15.3
Other Comprehensive Income		10.8			49.2			72.8			95.5
Comprehensive Income	$	181.2		$	204.8		$	546.2		$	607.9
(1)    Changes in Other-Than-Temporary-Impairment (OTTI) Losses	$	.5		$	7.3		$	(1.1	)	$	6.6
Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI		(1.8	)		(21.3	)		(22.2	)		(20.7	)
Other Security Gains (Losses), net		(.7	)		.5			(.8	)		.8
Investment Security Gains (Losses), net	$	(2.0	)	$	(13.5	)	$	(24.1	)	$	(13.3	)

See accompanying notes to the consolidated financial statements.

3

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

	Nine Months Ended September 30
(In Millions)	2011			2010
Common Stock
Balance at January 1 and September 30	$	408.6		$	408.6
Additional Paid-in Capital
Balance at January 1		920.0			888.3
Treasury Stock Transactions – Stock Options and Awards		(11.9	)		(19.4	)
Stock Options and Awards – Amortization		55.4			41.7
Stock Options and Awards – Tax Benefits		(.6	)		1.1
Balance at September 30		962.9			911.7
Retained Earnings
Balance at January 1		5,972.1			5,576.0
Net Income		473.4			512.4
Dividends Declared – Common Stock		(205.2	)		(204.6	)
Balance at September 30		6,240.3			5,883.8
Accumulated Other Comprehensive Income (Loss)
Balance at January 1		(305.3	)		(361.6	)
Net Unrealized Gains on Securities Available for Sale		55.2			34.5
Net Unrealized Gains (Losses) on Cash Flow Hedges		(9.6	)		42.2
Foreign Currency Translation Adjustments		10.6			3.5
Pension and Other Postretirement Benefit Adjustments		16.6			15.3
Balance at September 30		(232.5	)		(266.1	)
Treasury Stock
Balance at January 1		(165.1	)		(199.2	)
Stock Options and Awards		16.7			35.7
Stock Purchased		(78.1	)		(5.8	)
Balance at September 30		(226.5	)		(169.3	)
Total Stockholders’ Equity at September 30	$	7,152.8		$	6,768.7

See accompanying notes to the consolidated financial statements.

4

CONSOLIDATED STATEMENT OF CASH FLOWS	NORTHERN TRUST CORPORATION
(UNAUDITED)

	Nine Months
	Ended September 30
(In Millions)	2011			2010
Cash Flows from Operating Activities:
Net Income	$	473.4		$	512.4
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Investment Security Losses, net		24.1			13.3
Amortization and Accretion of Securities and Unearned Income		(19.2	)		(40.9	)
Provision for Credit Losses		42.5			120.0
Depreciation on Buildings and Equipment		67.7			70.3
Amortization of Computer Software		117.4			101.2
Amortization of Intangibles		11.5			11.0
Qualified Pension Plan Contribution		(10.6	)		(20.0	)
Visa Indemnification Benefit		(10.1	)		(12.7	)
(Increase) Decrease in Receivables		104.5			(115.8	)
Increase (Decrease) in Interest Payable		1.6			(6.0	)
Net Change in Derivative Fair Value, Including Required Collateral		(1,204.2	)		328.8
Other Operating Activities, net		264.4			(42.2	)
Net Cash Provided by (Used In) Operating Activities		(137.0	)		919.4
Cash Flows from Investing Activities:
Net Increase in Federal Funds Sold and Securities Purchased under Agreements to Resell		(61.6	)		(178.7	)
Net Increase in Interest-Bearing Deposits with Banks		(3,592.8	)		(3,195.3	)
Net Decrease in Federal Reserve Deposits and Other Interest-Bearing Assets		4,438.0			8,633.0
Purchases of Securities – Held to Maturity		(101.5	)		(382.4	)
Proceeds from Maturity and Redemption of Securities – Held to Maturity		195.9			377.2
Purchases of Securities – Available for Sale		(24,888.1	)		(11,429.2	)
Proceeds from Sale, Maturity and Redemption of Securities – Available for Sale		16,484.0			8,774.0
Net Increase in Loans and Leases		(634.9	)		(166.6	)
Purchases of Buildings and Equipment, net		(55.1	)		(58.6	)
Purchases and Development of Computer Software		(219.8	)		(152.7	)
Net (Increase) Decrease in Client Security Settlement Receivables		(246.9	)		90.5
Decrease in Cash Due to Acquisitions, net of Cash Acquired		(172.6	)		–
Other Investing Activities, net		(60.9	)		(6.8	)
Net Cash Provided by (Used in) Investing Activities		(8,916.3	)		2,304.4
Cash Flows from Financing Activities:
Net Increase in Deposits		14,318.3			164.6
Net Decrease in Federal Funds Purchased		(2,953.9	)		(1,844.6	)
Net Decrease in Securities Sold under Agreements to Repurchase		(615.1	)		(332.1	)
Net Increase (Decrease) in Short-Term Other Borrowings		522.3			(503.9	)
Proceeds from Term Federal Funds Purchased		7,959.9			17,208.3
Repayments of Term Federal Funds Purchased		(7,979.0	)		(16,581.3	)
Proceeds from Senior Notes and Long-Term Debt		500.0			642.7
Repayments of Senior Notes and Long-Term Debt		(879.8	)		(917.6	)
Treasury Stock Purchased		(77.7	)		(6.0	)
Net Proceeds from Stock Options		58.7			57.1
Cash Dividends Paid on Common Stock		(205.5	)		(204.6	)
Other Financing Activities, net		–			1.1
Net Cash Provided by (Used in) Financing Activities		10,648.2			(2,316.3	)
Effect of Foreign Currency Exchange Rates on Cash		(76.3	)		90.2
Increase in Cash and Due from Banks		1,518.6			997.7
Cash and Due from Banks at Beginning of Year		2,818.0			2,491.8
Cash and Due from Banks at End of Period	$	4,336.6		$	3,489.5
Supplemental Disclosures of Cash Flow Information:
Interest Paid	$	314.9		$	271.7
Income Taxes Paid		123.6			136.7
Transfers from Loans to OREO		57.5			24.5
See accompanying notes to the consolidated financial statements.

5

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, 2011 and 2010, 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. Certain prior period balances have been reclassified consistent with the current period’s presentations. For a description of Northern Trust’s significant accounting policies, refer to Note 1 of the Notes to Consolidated Financial Statements in the 2010 Annual Report to Shareholders.

2. Recent Accounting Pronouncements – In September 2011, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2011-08, “Testing Goodwill for Impairment”. The ASU provides the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the results of the qualitative analysis indicate it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, the quantitative two-step impairment test, which is required under current U.S. GAAP, would not be necessary. The ASU is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. The adoption of this ASU by Northern Trust, effective January 1, 2012, is not expected to have an impact on 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.

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

Northern Trust’s Level 1 assets and liabilities include available for sale investments in U.S. treasury securities and U.S. treasury securities held to fund employee benefit and deferred compensation obligations.

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.

6

Notes to Consolidated Financial Statements (continued)

Northern Trust’s Level 2 assets include available for sale and trading account securities. Their fair values are determined by external pricing vendors, or in limited cases internally, using widely accepted income-based (discounted cash flow) models that incorporate observable current market yield curves and assumptions regarding anticipated prepayments and defaults.

Level 2 assets and liabilities also include derivative contracts which are valued 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 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 2 other assets represent investments in mutual and collective trust funds held to fund employee benefit and deferred compensation obligations. These investments are valued at the funds’ net asset values based on a market approach.

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 from Northern Trust clients. To estimate their fair value, Northern Trust developed an internal income-based model. The lack of activity in the auction rate security market has resulted in a lack of observable market inputs to incorporate within the model. Therefore, significant inputs to the model include Northern Trust’s own assumptions about future cash flows and appropriate discount rates, both adjusted for credit and liquidity factors. In developing these assumptions, Northern Trust incorporated the contractual terms of the securities, the types of collateral, any credit enhancements available, and relevant market data, where available. Level 3 liabilities include financial guarantees relating to standby letters of credit, a net estimated liability for certain indemnification obligations related to litigation involving Visa Inc. (Visa), and acquisition related contingent consideration liabilities. Northern Trust’s recorded liability for standby letters of credit, reflecting the obligation it has undertaken, is measured as the amount of unamortized fees on these instruments. The fair value of the net estimated liability for Visa related indemnifications is based on a market approach, but requires management to exercise significant judgment given the limited number of market transactions involving identical or comparable liabilities. The fair value of contingent consideration liabilities is determined using an income-based (discounted cash flow) model that incorporates Northern Trust’s own assumptions about future cash flows and appropriate discount rates.

7

Notes to Consolidated Financial Statements (continued)

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

The following presents assets and liabilities measured at fair value on a recurring basis as of September 30, 2011 and December 31, 2010, segregated by fair value hierarchy level.

(In Millions)	Level 1		Level 2		Level 3		Netting *			Assets/Liabilities at Fair Value
September 30, 2011
Securities
Available for Sale
U.S. Government	$	2,020.9	$	—	$	—	$	—		$	2,020.9
Obligations of States and Political Subdivisions		—		18.4		—		—			18.4
Government Sponsored Agency		—		16,120.7		—		—			16,120.7
Corporate Debt		—		2,848.6		—		—			2,848.6
Non-U.S. Government		—		204.3		—		—			204.3
Residential Mortgage-Backed		—		183.4		—		—			183.4
Other Asset-Backed		—		1,637.5		—		—			1,637.5
Certificates of Deposit		—		3,544.5		—		—			3,544.5
Auction Rate		—		—		189.6		—			189.6
Other		—		1,671.4		—		—			1,671.4
Total		2,020.9		26,228.8		189.6		—			28,439.3
Trading Account		—		6.3		—		—			6.3
Total		2,020.9		26,235.1		189.6		—			28,445.6
Other Assets
Derivatives
Foreign Exchange Contracts		—		5,226.6		—		—			5,226.6
Interest Rate Swaps		—		348.0		—		—			348.0
Interest Rate Options		—		—		—		—			—
Credit Default Swaps		—		—		—		—			—
Forward Contracts		—		—		—		—			—
Total		—		5,574.6		—		(2,118.1	)		3,456.5
All Other		75.7		38.9		—		—			114.6
Total		75.7		5,613.5		—		(2,118.1	)		3,571.1
Total Assets at Fair Value	$	2,096.6	$	31,848.6	$	189.6	$	(2,118.1	)	$	32,016.7
Other Liabilities
Derivatives
Foreign Exchange Contracts	$	—	$	5,216.8	$	—	$	—		$	5,216.8
Interest Rate Swaps		—		232.3		—		—			232.3
Interest Rate Options		—		—		—		—			—
Credit Default Swaps		—		.4		—		—			.4
Forward Contracts		—		—		—		—			—
Total		—		5,449.5		—		(3,619.3	)		1,830.2
All Other		—		—		102.2		—			102.2
Total Liabilities at Fair Value	$	—	$	5,449.5	$	102.2	$	(3,619.3	)	$	1,932.4

* Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting agreements exist between Northern Trust and the counterparty. As of September 30, 2011, derivative assets and liabilities shown above also include reductions of $62.9 million and $1,564.1 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

8

Notes to Consolidated Financial Statements (continued)

(In Millions)	Level 1		Level 2		Level 3		Netting *			Assets/Liabilities at Fair Value
December 31, 2010
Securities
Available for Sale
U.S. Government	$	658.4	$	—	$	—	$	—		$	658.4
Obligations of States and Political Subdivisions		—		36.3		—		—			36.3
Government Sponsored Agency		—		11,970.7		—		—			11,970.7
Corporate Debt		—		2,554.0		—		—			2,554.0
Non-U.S. Government		—		440.6		—		—			440.6
Residential Mortgage-Backed		—		254.6		—		—			254.6
Other Asset-Backed		—		1,605.7		—		—			1,605.7
Certificates of Deposit		—		1,402.5		—		—			1,402.5
Auction Rate		—		—		367.8		—			367.8
Other		—		611.3		—		—			611.3
Total		658.4		18,875.7		367.8		—			19,901.9
Trading Account		—		6.8		—		—			6.8
Total		658.4		18,882.5		367.8		—			19,908.7
Other Assets
Derivatives
Foreign Exchange Contracts		—		5,792.8		—		—			5,792.8
Interest Rate Swaps		—		285.8		—		—			285.8
Interest Rate Options		—		.1		—		—			.1
Credit Default Swaps		—		—		—		—			—
Forward Contracts		—		.5		—		—			.5
Total		—		6,079.2		—		(4,449.9	)		1,629.3
All Other		65.9		37.4		—		—			103.3
Total		65.9		6,116.6		—		(4,449.9	)		1,732.6
Total Assets at Fair Value	$	724.3	$	24,999.1	$	367.8	$	(4,449.9	)	$	21,641.3
Other Liabilities
Derivatives
Foreign Exchange Contracts	$	—	$	5,781.3	$	—	$	—		$	5,781.3
Interest Rate Swaps		—		163.7		—		—			163.7
Interest Rate Options		—		.1		—		—			.1
Credit Default Swaps		—		2.8		—		—			2.8
Forward Contracts		—		.2		—		—			.2
Total		—		5,948.1		—		(4,770.9	)		1,177.2
All Other		—		—		58.6		—			58.6
Total Liabilities at Fair Value	$	—	$	5,948.1	$	58.6	$	(4,770.9	)	$	1,235.8

* Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting agreements exist between Northern Trust and the counterparty. As of December 31, 2010, derivative assets and liabilities shown above also include reductions of $2,631.7 million and $2,952.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

9

Notes to Consolidated Financial Statements (continued)

The following presents the changes in Level 3 assets for the three and nine months ended September 30, 2011 and 2010.

	Auction Rate Securities
(In Millions)	2011			2010
Three Months Ended September 30
Fair Value at July 1	$	205.1		$	384.9
Total Realized and Unrealized
(Gains) Losses Included in Earnings		(.6	)		(.3	)
Gains (Losses) Included in Other Comprehensive Income		(5.2	)		(1.5	)
Purchases, Issuances, Sales, and Settlements
Sales		—			—
Settlements		(9.7	)		(3.1	)
Fair Value at September 30	$	189.6		$	380.0

	2011			2010
Nine Months Ended September 30
Fair Value at January 1	$	367.8		$	427.7
Total Realized and Unrealized
(Gains) Losses Included in Earnings		(10.2	)		(2.9	)
Gains (Losses) Included in Other Comprehensive Income		(15.8	)		(7.4	)
Purchases, Issuances, Sales, and Settlements
Sales		(1.5	)		(.3	)
Settlements		(150.7	)		(37.1	)
Fair Value at September 30	$	189.6		$	380.0

Northern Trust purchased certain illiquid auction rate securities from clients in 2008 which were recorded at their purchase date fair values and designated as available for sale securities. Subsequent to their purchase, the securities are reported at fair value and unrealized gains and losses are credited or charged, net of the tax effect, to accumulated other comprehensive income (AOCI). As of September 30, 2011 and December 31, 2010, the net unrealized loss related to these securities was $5.0 million ($3.1 million net of tax) and $10.8 million ($6.8 million net of tax), respectively. Realized gains for the three month period ended September 30, 2011 of $.6 million represent redemptions by issuers. Realized gains for the nine month period ended September 30, 2011 of $10.2 million include $10.1 million from redemptions by issuers and $.1 million from sales of securities. Realized gains for the three and nine month period ended September 30, 2010 of $.3 million and $2.9 million, respectively, represent redemptions by issuers. Gains on redemptions and sales are included in interest income and investment security gains (losses), net, respectively, within the consolidated statement of income.

10

Notes to Consolidated Financial Statements (continued)

The following presents the changes in Level 3 liabilities for the three and nine months ended September 30, 2011 and 2010.

	Other Liabilities *
(In Millions)	2011			2010
Three Months Ended September 30
Fair Value at July 1	$	55.2		$	81.0
Total Realized and Unrealized (Gains) Losses
Included in Earnings		1.4			(1.7	)
Included in Other Comprehensive Income		—			—
Purchases, Issuances, Sales, and Settlements
Issuances		45.7			1.8
Settlements		(.1	)		(.1	)
Fair Value at September 30	$	102.2		$	81.0
Nine Months Ended September 30
Fair Value at January 1	$	58.6		$	94.4
Total Realized and Unrealized (Gains) Losses
Included in Earnings		2.7			(2.4	)
Included in Other Comprehensive Income		—			—
Purchases, Issuances, Sales, and Settlements
Issuances		53.2			3.1
Settlements		(12.3	)		(14.1	)
Fair Value at September 30	$	102.2		$	81.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at September 30		—			—

* Balances relate to standby letters of credit, contingent consideration liabilities, and the net estimated liability for Visa related indemnifications.

All realized and unrealized gains and losses related to Level 3 liabilities are included in other operating income or other operating expense with the exception of those related to the Visa indemnification liability, which have been presented separately in the consolidated statement of income.

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

11

Notes to Consolidated Financial Statements (continued)

The following provides information regarding those assets measured at fair value on a nonrecurring basis at September 30, 2011 and 2010, segregated by fair value hierarchy level.

(In Millions)	Level 1		Level 2		Level 3		Total Fair Value
September 30, 2011
Loans (1)	$	—	$	—	$	46.6	$	46.6
Other Real Estate Owned (2)		—		—		4.0		4.0
Total Assets at Fair Value	$	—	$	—	$	50.6	$	50.6
September 30, 2010
Loans (1)	$	—	$	—	$	74.6	$	74.6
Other Real Estate Owned (2)		—		—		7.4		7.4
Total Assets at Fair Value	$	—	$	—	$	82.0	$	82.0

(1) Northern Trust provided an additional $3.0 million and $1.7 million of specific reserves to reduce the fair value of these loans during the three months ended September 30, 2011 and 2010, respectively. During the nine months ended September 30, 2011 and 2010, these loans were reduced by $10.5 million and $16.1 million, respectively.

(2) Northern Trust charged $1.7 million and $2.6 million through other operating expenses during the three months ended September 30, 2011 and 2010 respectively to reduce the fair values of these Other Real Estate Owned (OREO) properties. During the nine months ended September 30 2011 and 2010, the fair values of these OREO properties were reduced by $1.8 million and $3.8 million, respectively.

The fair values of loan collateral and OREO properties were estimated using a market approach typically supported by third party appraisals, and were subject to adjustments to reflect management’s judgment as to their realizable value.

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, modeled internally, using widely accepted models which are based on an income approach that incorporates current market yield curves and assumptions regarding anticipated prepayments and defaults.

Loans (Excluding Lease Receivables). The fair value of the loan portfolio was estimated using a discounted cash flow methodology based on 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 collectibility.

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.

Affordable Housing Investments. Affordable housing investments are valued at cost, which approximates fair value.

12

Notes to Consolidated Financial Statements (continued)

Savings Certificates, Other Time, and Non-U.S. Offices Interest-Bearing Deposits. The fair values of instruments with stated maturities were estimated using an income approach (discounted cash flow) that incorporates market interest rates. Due to their short maturity, the fair value of instruments without stated maturities approximated their fair values.

Senior Notes, Subordinated Debt, Federal Home Loan Bank Borrowings, 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.

Loan Commitments. The fair values of loan commitments represent the amount of unamortized fees on these instruments.

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, and federal reserve deposits and other interest-bearing assets; client security settlement receivables; 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.

13

Notes to Consolidated Financial Statements (continued)

The following table summarizes the fair values of financial instruments.

	September 30, 2011				December 31, 2010
(In Millions)	Book Value		Fair Value		Book Value			Fair Value
Assets
Cash and Due from Banks	$	4,336.6	$	4,336.6		$	2,818.0	$	2,818.0
Federal Funds Sold and Resell Agreements		221.8		221.8			160.1		160.1
Interest-Bearing Deposits with Banks		18,944.2		18,944.2			15,351.3		15,351.3
Federal Reserve Deposits and Other Interest-Bearing		6,498.2		6,498.2			10,924.6		10,924.6
Securities
Available for Sale		28,439.3		28,439.3			19,901.9		19,901.9
Held to Maturity		829.2		847.2			922.2		941.8
Trading Account		6.3		6.3			6.8		6.8
Loans (excluding Leases)
Held for Investment		27,369.6		27,603.0			26,747.8		26,814.2
Held for Sale		10.0		10.0			2.2		2.2
Client Security Settlement Receivables		948.2		948.2			701.3		701.3
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		185.3		185.3			185.5		185.5
Affordable Housing Investments		252.3		252.3			265.4		265.4
Liabilities
Deposits
Demand, Noninterest-Bearing, and Savings and Money Market	$	37,401.0	$	37,401.0		$	24,810.3	$	24,810.3
Savings Certificates, Other Time and Non U. S. Offices Interest-Bearing		41,113.0		41,126.0			39,385.4		39,402.1
Federal Funds Purchased		737.8		737.8			3,691.7		3,691.7
Securities Sold under Agreements to Repurchase		339.3		339.3			954.4		954.4
Other Borrowings		817.6		817.6			347.7		347.7
Senior Notes		2,133.5		2,196.1			1,896.1		1,936.5
Long Term Debt (excluding Leases)
Subordinated Debt		1,036.6		1,038.9			1,148.7		1,177.2
Federal Home Loan Bank Borrowings		1,055.0		1,101.9			1,532.5		1,613.5
Floating Rate Capital Debt		276.9		229.9			276.9		223.2
Financial Guarantees		102.2		102.2			58.6		58.6
Loan Commitments		32.8		32.8			32.4		32.4
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	23.7	$	23.7		$	44.9	$	44.9
Liabilities		26.8		26.8			51.4		51.4
Interest Rate Swaps
Assets		154.4		154.4			134.6		134.6
Liabilities		42.8		42.8			15.3		15.3
Credit Default Swaps
Assets		—		—			—		—
Liabilities		.4		.4			2.8		2.8
Forward Contracts
Assets		—		—			.5		.5
Liabilities		—		—			.2		.2
Client-Related and Trading
Foreign Exchange Contracts
Assets		5,202.9		5,202.9			5,747.9		5,747.9
Liabilities		5,190.0		5,190.0			5,729.9		5,729.9
Interest Rate Swaps
Assets		193.6		193.6			151.2		151.2
Liabilities		189.5		189.5			148.4		148.4
Interest Rate Options
Assets		—		—			.1		.1
Liabilities		—		—			.1		.1

14

Notes to Consolidated Financial Statements (continued)

4. Securities —  The following tables provide the amortized cost and fair values of securities at September 30, 2011 and December 31, 2010.

		000000		000000		000000		000000
	September 30, 2011
Securities Available for Sale	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
U.S. Government	$	1,967.4	$	53.5	$	—	$	2,020.9
Obligations of States and Political Subdivisions		17.5		.9		—		18.4
Government Sponsored Agency		16,055.4		78.7		13.4		16,120.7
Corporate Debt		2,840.8		10.2		2.4		2,848.6
Non-U.S. Government Debt		204.3		—		—		204.3
Residential Mortgage-Backed		215.8		—		32.4		183.4
Other Asset-Backed		1,638.3		1.7		2.5		1,637.5
Certificates of Deposit		3,545.2		—		.7		3,544.5
Auction Rate		194.6		4.8		9.8		189.6
Other		1,653.5		18.5		.6		1,671.4
Total	$	28,332.8	$	168.3	$	61.8	$	28,439.3

		0000000		0000000		0000000		0000000
	September 30, 2011
Securities Held to Maturity	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
Obligations of States and Political Subdivisions	$	553.1	$	25.3	$	.1	$	578.3
Government Sponsored Agency		163.9		4.9		—		168.8
Other		112.2		—		12.1		100.1
Total	$	829.2	$	30.2	$	12.2	$	847.2

		00000000		00000000		00000000		00000000
	December 31, 2010
Securities Available for Sale	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
U.S. Government	$	667.2	$	1.0	$	9.8	$	658.4
Obligations of States and Political Subdivisions		35.4		.9		—		36.3
Government Sponsored Agency		11,937.0		47.0		13.3		11,970.7
Corporate Debt		2,547.7		7.8		1.5		2,554.0
Non-U.S. Government Debt		440.6		—		—		440.6
Residential Mortgage-Backed		308.0		.9		54.3		254.6
Other Asset-Backed		1,606.5		1.5		2.3		1,605.7
Certificates of Deposit		1,402.5		—		—		1,402.5
Auction Rate		357.0		14.2		3.4		367.8
Other		610.8		4.2		3.7		611.3
Total	$	19,912.7	$	77.5	$	88.3	$	19,901.9

		0000000		0000000		0000000		0000000
	December 31, 2010
Securities Held to Maturity	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
Obligations of States and Political Subdivisions	$	635.0	$	26.2	$	.4	$	660.8
Government Sponsored Agency		169.3		4.6		.2		173.7
Other		117.9		—		10.6		107.3
Total	$	922.2	$	30.8	$	11.2	$	941.8

15

Notes to Consolidated Financial Statements (continued)

The following table provides the remaining maturity of securities as of September 30, 2011.

(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	11,153.3	$	11,155.2
Due After One Year Through Five Years		15,578.1		15,670.4
Due After Five Years Through Ten Years		851.7		858.7
Due After Ten Years		749.7		755.0
Total		28,332.8		28,439.3
Held to Maturity
Due in One Year or Less		141.6		142.2
Due After One Year Through Five Years		284.9		292.9
Due After Five Years Through Ten Years		240.7		250.8
Due After Ten Years		162.0		161.3
Total	$	829.2	$	847.2

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

Investment Security Gains and Losses. Net investment security losses totaling $2.0 million and $24.1 million were recognized for the three and nine months ended September 30, 2011, respectively, and losses totaling $13.5 million and $13.3 million were recognized for the three and nine months ended September 30, 2010, respectively. Included in the net losses were other-than-temporary impairment (OTTI) losses that totaled $1.3 million and $23.3 million for the three and nine months ended September 30, 2011, respectively, and $14.0 million and $14.1 million for the three and nine months ended September 30, 2010, respectively. There were $.7 million and $.8 million other realized net security losses for the three and nine months ended September 30, 2011, respectively, and $.5 million and $.8 million of other realized security gains for the three and nine months ended September 30, 2010, respectively.

Securities with Unrealized Losses. The following tables provide information regarding securities that have been in a continuous unrealized loss position for less than 12 months and for 12 months or longer as of September 30, 2011 and December 31, 2010.

Securities with Unrealized     Losses as of September 30, 2011	Less than 12 Months				12 Months or Longer				Total
(In Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Obligations of States and Political Subdivisions	$	1.0	$	—	$	3.1	$	.1	$	4.1	$	.1
Government Sponsored Agency		5,335.3		11.4		414.1		2.0		5,749.4		13.4
Corporate Debt		408.8		1.3		99.2		1.1		508.0		2.4
Residential Mortgage-Backed		5.6		.2		177.4		32.2		183.0		32.4
Other Asset-Backed		687.8		2.2		87.4		.3		775.2		2.5
Certificates of Deposit		2,034.2		.7		—		—		2,034.2		.7
Auction Rate		63.2		4.9		53.9		4.9		117.1		9.8
Other		260.6		2.0		44.8		10.7		305.4		12.7
Total	$	8,796.5	$	22.7	$	879.9	$	51.3	$	9,676.4	$	74.0

16

Notes to Consolidated Financial Statements (continued)

Securities with Unrealized Losses     as of December 31, 2010	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	$	492.9	$	9.8	$	—	$	—	$	492.9	$	9.8
Obligations of States and Political Subdivisions		3.0		—		3.2		.4		6.2		.4
Government Sponsored Agency		980.7		11.0		328.7		2.5		1,309.4		13.5
Corporate Debt		930.6		1.1		475.2		.4		1,405.8		1.5
Residential Mortgage-Backed		—		—		248.8		54.3		248.8		54.3
Other Asset-Backed		513.5		2.2		27.0		.1		540.5		2.3
Auction Rate		77.6		3.3		.7		.1		78.3		3.4
Other		482.2		6.8		36.5		7.5		518.7		14.3
Total	$	3,480.5	$	34.2	$	1,120.1	$	65.3	$	4,600.6	$	99.5

As of September 30, 2011, 341 securities with a combined fair value of $9.7 billion were in an unrealized loss position, with their unrealized losses totaling $74.0 million. Unrealized losses on residential mortgage-backed securities totaling $32.4 million reflect the impact of credit and liquidity spreads on the valuations of 25 residential mortgage-backed securities, with $32.2 million having been in an unrealized loss position for more than 12 months. Residential mortgage-backed securities rated below double-A at September 30, 2011 represented 81% of the total fair value of residential mortgage-backed securities, were comprised primarily of sub-prime and Alt-A securities, and had a total amortized cost and fair value of $179.7 million and $149.2 million, respectively. Securities classified as “other asset-backed” at September 30, 2011 were predominantly floating rate with average lives less than 5 years, and 100% were rated triple-A.

Unrealized losses of $13.4 million related to government sponsored agency securities are primarily attributable to changes in market rates since their purchase. The majority of the $12.7 million of unrealized losses in securities classified as “other” at September 30, 2011 relate to securities which Northern Trust purchases for compliance with the Community Reinvestment Act (CRA). Unrealized losses on these CRA related other securities are attributable to their purchase at 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 $9.8 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. Unrealized losses of $2.4 million within corporate debt securities primarily reflect widened credit spreads; 74% of the corporate debt portfolio is backed by guarantees provided by U.S. and non-U.S. governmental entities. The remaining unrealized losses on Northern Trust’s securities portfolio as of September 30, 2011 are attributable to changes in overall market interest rates, increased credit spreads, or reduced market liquidity.

17

Notes to Consolidated Financial Statements (continued)

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 which 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 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 to earnings equal to the difference between the two amounts.

Expected losses on 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 developing the expected loss on non-agency residential mortgage-backed securities vary by year of origination and type of collateral. As of September 30, 2011, the expected losses on subprime, Alt-A, prime and 2nd lien 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. September 30, 2011 amortized cost, weighted average ultimate default rates, and loss severity rates for the non-agency residential mortgage-backed securities portfolio, by security type, are provided in the following table.

18

Notes to Consolidated Financial Statements (continued)

(In Millions)	September 30, 2011
						Loss Severity Rates
Security Type	Amortized Cost		Weighted Average Ultimate Default Rates			Low			High			Weighted Average
Prime	$	24.4		16.1	%		39.4	%		66.0	%		51.8	%
Alt-A		35.4		41.9			57.9			71.7			68.5
Subprime		120.4		51.1			68.8			86.0			74.4
2nd Lien		35.6		33.1			98.8			100.0			99.5
Total Non-Agency Residential Mortgage-Backed Securities	$	215.8		42.4	%		39.4	%		100.0	%		75.0	%

During the three and nine months ended September 30, 2011, performance metrics specific to subprime and Alt-A loans remained weak resulting in the recognition of OTTI losses of $1.3 million and $23.3 million, respectively, in connection with residential mortgage-backed securities. OTTI losses totaled $14.0 million and $14.1 million for the three and nine months ended September 30, 2010, respectively.

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, 2011 and 2010.

	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2011			2010			2011			2010
Changes in OTTI Losses*	$	.5		$	7.3		$	(1.1	)	$	6.6
Noncredit-related Losses Recorded in / (Reclassified from) OCI**		(1.8	)		(21.3	)		(22.2	)		(20.7	)
Net Impairment Losses Recognized in Earnings	$	(1.3	)	$	(14.0	)	$	(23.3	)	$	(14.1	)

* 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.

** 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)	2011			2010		2011			2010
Cumulative Credit-Related Losses on Securities Held – Beginning of Period	$	116.2		$	73.1	$	94.2		$	73.0
Plus: Losses on Newly Identified Impairements		—			.1		1.5			.1
Additional Losses on Previously Identified Impairements		1.3			13.9		21.8			14.0
Less: Losses on Securities Sold During the Period		(49.3	)		—		(49.3	)		—
Cumulative Credit-Related Losses on Securities Held – End of Period	$	68.2		$	87.1	$	68.2		$	87.1

19

Notes to Consolidated Financial Statements (continued)

The table below provides information regarding debt securities held as of September 30, 2011 and December 31, 2010, for which an OTTI loss had been recognized in the current period or previously.

(In Millions)	September 30, 2011			December 31, 2010
Fair Value	$	77.9		$	79.9
Amortized Cost Basis		99.9			113.3
Noncredit-related Losses Recognized in OCI		(22.0	)		(33.4	)
Tax Effect		8.1			12.2
Amount Recorded in OCI	$	(13.9	)	$	(21.2	)

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

(In Millions)	September 30, 2011			December 31, 2010
Commercial
Commercial and Institutional	$	6,458.0		$	5,914.5
Commercial Real Estate		2,958.2			3,242.4
Lease Financing, net		1,014.1			1,063.7
Non-U.S.		1,315.2			1,046.2
Other		473.8			346.6
Total Commercial		12,219.3			11,613.4
Personal
Residential Real Estate		10,772.4			10,854.9
Private Client		5,427.7			5,423.7
Other		272.0			240.0
Total Personal		16,472.1			16,518.6
Total Loans and Leases		28,691.4			28,132.0
Allowance for Credit Losses Assigned to Loans and Leases		(298.3	)		(319.6	)
Net Loans and Leases	$	28,393.1		$	27,812.4

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 $1.9 billion and $1.4 billion at September 30, 2011 and December 31, 2010, respectively. Loans classified as held for sale totaled $10.0 million at September 30, 2011 and $2.2 million at December 31, 2010.

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.

20

Notes to Consolidated Financial Statements (continued)

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 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, 2011 and December 31, 2010 are provided below, segregated by borrower ratings into below average risk, average risk, and watch list categories.

	September 30, 2011								December 31, 2010
(In Millions)	Below Average Risk		Average Risk		Watch List		Total		Below Average Risk		Average Risk		Watch List		Total
Commercial
Commercial and Institutional	$	3,273.0	$	2,974.6	$	210.4	$	6,458.0	$	2,821.5	$	2,849.8	$	243.2	$	5,914.5
Commercial Real Estate		1,291.6		1,362.8		303.8		2,958.2		1,232.8		1,594.3		415.3		3,242.4
Lease Financing, net		536.6		464.1		13.4		1,014.1		571.6		473.0		19.1		1,063.7
Non-U.S.		612.5		687.3		15.4		1,315.2		430.0		596.5		19.7		1,046.2
Other		400.4		73.4		—		473.8		209.5		137.1		—		346.6
Total Commercial		6,114.1		5,562.2		543.0		12,219.3		5,265.4		5,650.7		697.3		11,613.4
Personal
Residential Real Estate		2,739.1		7,631.8		401.5		10,772.4		2,896.0		7,586.9		372.0		10,854.9
Private Client		3,059.1		2,335.4		33.2		5,427.7		3,326.5		2,064.1		33.1		5,423.7
Other		120.1		151.9		—		272.0		78.1		161.9		—		240.0
Total Personal		5,918.3		10,119.1		434.7		16,472.1		6,300.6		9,812.9		405.1		16,518.6
Total Loans and Leases	$	12,032.4	$	15,681.3	$	977.7	$	28,691.4	$	11,566.0	$	15,463.6	$	1,102.4	$	28,132.0

21

Notes to Consolidated Financial Statements (continued)

Borrowers designated as below average risk represent exposures with borrower ratings from “1—3”. These credits 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.

Borrowers designated as average risk represent exposures with borrower ratings of “4” and “5”. These credits are expected to exhibit moderate to acceptable probabilities of default and are characterized by borrowers with less financial flexibility than those in the below average risk 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.

Borrowers designated as watch list represent exposures with elevated credit risk profiles that are monitored through internal watch lists, and consist of credits with borrower ratings of “6—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.

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 one of the following conditions are met: (i) no principal and interest is due and unpaid and repayment of the remaining contractual principal and interest is expected; (ii) 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 and repayment of the remaining contractual principal and interest is expected; or (iii) the loan has otherwise become well-secured (possessing realizable value sufficient to

22

Notes to Consolidated Financial Statements (continued)

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). 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 after the contractual due date a principal or interest payment is received. 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, 2011 and December 31, 2010.

September 30, 2011
(In Millions)	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past  Due		Current		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	8.0	$	18.4	$	1.6	$	6,394.5	$	6,422.5	$	35.5	$	6,458.0
Commercial Real Estate		6.3		7.4		5.3		2,855.2		2,874.2		84.0		2,958.2
Lease Financing, net		—		—		—		1,014.1		1,014.1		—		1,014.1
Non-U.S.		—		—		—		1,315.2		1,315.2		—		1,315.2
Other		—		—		—		473.8		473.8		—		473.8
Total Commercial	$	14.3	$	25.8	$	6.9	$	12,052.8	$	12,099.8	$	119.5	$	12,219.3
Personal
Residential Real Estate	$	16.2	$	31.8	$	4.7	$	10,537.8	$	10,590.5	$	181.9	$	10,772.4
Private Client		16.5		10.9		.8		5,393.4		5,421.6		6.1		5,427.7
Other		—		—		—		272.0		272.0		—		272.0
Total Personal		32.7		42.7		5.5		16,203.2		16,284.1		188.0		16,472.1
Total Loans and Leases	$	47.0	$	68.5	$	12.4	$	28,256.0	$	28,383.9	$	307.5	$	28,691.4
						Total Other Real Estate Owned						30.4
						Total Nonperforming Assets					$	337.9

December 31, 2010
(In Millions)	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Current		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	16.3	$	8.2	$	.8	$	5,831.2	$	5,856.5	$	58.0	$	5,914.5
Commercial Real Estate		24.2		15.7		9.4		3,076.7		3,126.0		116.4		3,242.4
Lease Financing, net		—		—		—		1,063.7		1,063.7		—		1,063.7
Non-U.S.		—		—		—		1,046.2		1,046.2		—		1,046.2
Other		—		—		—		346.6		346.6		—		346.6
Total Commercial		40.5		23.9		10.2		11,364.4		11,439.0		174.4		11,613.4
Personal
Residential Real Estate		76.1		17.2		.9		10,607.4		10,701.6		153.3		10,854.9
Private Client		35.7		13.0		1.9		5,367.8		5,418.4		5.3		5,423.7
Other		—		—		—		240.0		240.0		—		240.0
Total Personal		111.8		30.2		2.8		16,215.2		16,360.0		158.6		16,518.6
Total Loans and Leases	$	152.3	$	54.1	$	13.0	$	27,579.6	$	27,799.0	$	333.0	$	28,132.0
						Total Other Real Estate Owned						45.5
						Total Nonperforming Assets					$	378.5

23

Notes to Consolidated Financial Statements (continued)

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. Impaired loans are 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 reserve 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 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.

24

Notes to Consolidated Financial Statements (continued)

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

	As of September 30, 2011						Three Months Ended September 30, 2011				Nine Months Ended September 30, 2011
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Reserve		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With No Related Specific Reserve
Commercial and Institutional	$	21.5	$	27.2			$	20.1	$	—	$	21.0	$	—
Commercial Real Estate		41.9		53.7				34.2		.3		34.5		.4
Residential Real Estate		138.8		178.3				107.9		.5		123.2		1.6
Private Client		5.3		5.6				3.2		—		3.5		—
With a Related Specific Reserve
Commercial and Institutional		16.0		25.0	$	11.9		12.7		—		29.1		—
Commercial Real Estate		52.6		68.2		17.2		45.2		—		71.0		—
Residential Real Estate		11.1		11.6		5.2		7.5		—		8.3		—
Private Client		1.7		1.7		.5		1.7		—		2.2		—
Total
Commercial		132.0		174.1		29.1		112.2		.3		155.6		.4
Personal		156.9		197.2		5.7		120.3		.5		137.2		1.6
Total	$	288.9	$	371.3	$	34.8	$	232.5	$	.8	$	292.8	$	2.0

	As of December 31, 2010
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Reserve
With No Related Specific Reserve
Commercial and Institutional	$	17.9	$	26.1
Commercial Real Estate		43.7		62.4
Residential Real Estate		111.9		138.1
Private Client		3.7		3.9
With a Related Specific Reserve
Commercial and Institutional		41.7		47.8	$	19.8
Commercial Real Estate		77.2		88.9		29.5
Residential Real Estate		5.1		5.1		2.4
Total
Commercial		180.5		225.2		49.3
Personal		120.7		147.1		2.4
Total	$	301.2	$	372.3	$	51.7

The following table provides average recorded investments in impaired loans and the interest income that would have been recorded on nonperforming loans in accordance with their original terms, for the three and nine months ended September 30, 2011 and 2010.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2011		2010		2011		2010
Average Recorded Investment in Impaired Loans *	$	232.5	$	257.6	$	292.8	$	233.5
Interest Income That Would Have Been Recorded on Nonperforming Loans in Accordance with Their Original Terms		3.7		4.2		11.8		11.8

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

25

Notes to Consolidated Financial Statements (continued)

There were $11.8 million and $16.3 million of unfunded loan commitments and standby letters of credit at September 30, 2011 and December 31, 2010, respectively, issued to borrowers whose loans were classified as nonperforming or impaired.

Troubled Debt Restructurings. As of September 30, 2011 and December 31, 2010, there were $76.2 million and $33.4 million of nonperforming TDRs, respectively, and $35.5 million and $22.9 million of performing TDRs, respectively, included within impaired loans. All TDRs are considered impaired loans in the calendar year of their restructuring. In subsequent years, a TDR may cease being classified 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 classified as impaired.

The following table provides, by class, the number of loans and leases modified in troubled debt restructurings during the three and nine month periods ended September 30, 2011, and the recorded investments and unpaid principal balances as of September 30, 2011.

	Three Months Ended September 30, 2011						Nine Months Ended September 30, 2011
	Number of		Recorded		Unpaid Principal		Number of		Recorded		Unpaid Principal
($ In Millions)	Loans and Leases		Investment		Balance		Loans and Leases		Investment		Balance
Commercial
Commercial and Institutional		2	$	5.4	$	6.4		5	$	8.6	$	10.1
Commercial Real Estate		6		10.6		12.3		14		39.4		46.0
Total Commercial		8		16.0		18.7		19		48.0		56.1
Personal
Residential Real Estate		25		7.1		9.1		113		22.0		27.9
Private Client		—		—		—		1		—		—
Total Personal		25		7.1		9.1		114		22.0		27.9
Total Loans and Leases		33	$	23.1	$	27.8		133	$	70.0	$	84.0

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

TDR modifications primarily 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-month periods ended September 30, 2011, TDR modifications of loans within the commercial and institutional class were primarily interest rate concessions, deferrals of principal and other modifications; modifications of commercial real estate loans were primarily deferrals of principal, extensions of term and other modifications; and modifications of residential real estate loans were primarily interest rate concessions and deferrals of principal.

26

Notes to Consolidated Financial Statements (continued)

The following table provides the number of loans and leases modified in troubled debt restructurings during the previous 12 months which subsequently became nonperforming during the three and nine month periods ended September 30, 2011, as well as the recorded investments and unpaid principal balances as of September 30, 2011.

	Three Months Ended September 30, 2011						Nine Months Ended September 30, 2011
	Number of		Recorded		Unpaid Principal		Number of		Recorded		Unpaid Principal
($ In Millions)	Loans and Leases		Investment		Balance		Loans and Leases		Investment		Balance
Commercial
Commercial and Institutional		1	$	.2	$	.6		1	$	.2	$	.6
Total Commercial		1		.2		.6		1		.2		.6
Personal
Residential Real Estate		1		.1		.1		7		2.0		2.5
Total Personal		1		.1		.1		7		2.0		2.5
Total Loans and Leases		2	$	.3	$	.7		8	$	2.2	$	3.1

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

All loans and leases modified in troubled debt restructurings are evaluated for impairment. The nature and extent of impairment of TDRs, including those which 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, unfunded 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.

Northern Trust’s Loan Loss Allowance Committee assesses a common set of qualitative factors in establishing the inherent portion of the allowance for credit losses for 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 reserve. 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 unfunded commitments and standby letters of credit. These qualitative factors, together with historical loss rates, serve as the basis for the allowance for credit losses.

27

Notes to Consolidated Financial Statements (continued)

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 reserve 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 the changes in the allowance for credit losses by segment during the three and nine month periods ended September 30, 2011 and 2010.

	Three Months Ended September 30,
	2011									2010
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	239.9		$	105.9		$	345.8		$	265.3		$	96.3		$	361.6
Charge-Offs		(16.8	)		(18.1	)		(34.9	)		(17.5	)		(14.3	)		(31.8	)
Recoveries		4.4			1.9			6.3			.8			.7			1.5
Net Charge-Offs		(12.4	)		(16.2	)		(28.6	)		(16.7	)		(13.6	)		(30.3	)
Provision for Credit Losses		(6.4	)		23.9			17.5			12.6			17.4			30.0
Effect of Foreign Exchange Rates		(.1	)		—			(.1	)		.1			—			.1
Balance at End of Period	$	221.0		$	113.6		$	334.6		$	261.3		$	100.1		$	361.4

	Nine Months Ended September 30,
	2011									2010
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	256.7		$	100.6		$	357.3		$	252.2		$	88.4		$	340.6
Charge-Offs		(45.0	)		(42.5	)		(87.5	)		(61.7	)		(43.1	)		(104.8	)
Recoveries		17.5			4.8			22.3			2.9			2.7			5.6
Net Charge-Offs		(27.5	)		(37.7	)		(65.2	)		(58.8	)		(40.4	)		(99.2	)
Provision for Credit Losses		(8.2	)		50.7			42.5			67.9			52.1			120.0
Effect of Foreign Exchange Rates		—			—			—			—			—			—
Balance at End of Period	$	221.0		$	113.6		$	334.6		$	261.3		$	100.1		$	361.4

The following tables provide information regarding the balances of the recorded investments in loans and leases and the allowance for credit losses by segment as of September 30, 2011 and December 31, 2010.

	September 30, 2011						December 31, 2010
(In Millions)	Commercial		Personal		Total		Commercial		Personal		Total
Loans and Leases
Specifically Evaluated for Impairment	$	132.0	$	156.9	$	288.9	$	180.5	$	120.7	$	301.2
Evaluated for Inherent Impairment		12,087.3		16,315.2		28,402.5		11,432.9		16,397.9		27,830.8
Total Loans and Leases		12,219.3		16,472.1		28,691.4		11,613.4		16,518.6		28,132.0
Allowance for Loans and Leases
Specifically Evaluated for Impairment		29.1		5.7		34.8		49.3		2.4		51.7
Evaluated for Inherent Impairment		157.3		106.2		263.5		171.4		96.5		267.9
Allowance Assigned to Loans and Leases		186.4		111.9		298.3		220.7		98.9		319.6
Allowance for Unfunded Exposures
Commitments and Standby Letters of Credit		34.6		1.7		36.3		36.0		1.7		37.7
Total Allowance for Credit Losses	$	221.0	$	113.6	$	334.6	$	256.7	$	100.6	$	357.3

28

Notes to Consolidated Financial Statements (continued)

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. At September 30, 2011, $27.4 billion ($16.4 billion of government sponsored agency and other securities, $458.2 million of obligations of states and political subdivisions, and $10.5 billion of loans) were pledged. This compares to $23.9 billion ($12.8 billion of government sponsored agency and other securities, $576.5 million of obligations of states and political subdivisions, and $10.5 billion of loans) at December 31, 2010. Collateral required for these purposes totaled $4.1 billion and $4.5 billion on September 30, 2011 and December 31, 2010, respectively. Included in the total pledged assets at September 30, 2011 and December 31, 2010 were available for sale securities with a total fair value of $.7 billion and $1.1 billion, 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 permitted to repledge or sell collateral from agreements to resell securities purchased transactions. The total fair value of accepted collateral as of September 30, 2011 and December 31, 2010 was $205.4 million and $152.1 million, respectively. There was no repledged or sold collateral at September 30, 2011 or December 31, 2010.

Deposits maintained to meet Federal Reserve Bank reserve requirements averaged $467.5 million and $307.5 million for the three and nine months ended September 30, 2011, respectively, and averaged $186.4 million and $257.8 million for the three and nine months ended September 30, 2010, respectively.

8. Goodwill and Other Intangibles – Changes in the carrying amount of goodwill by business unit for the three months ended March 31, 2011, June 30, 2011, and September 30, 2011 were as follows:

(In Millions)	Corporate and Institutional  Services			Personal Financial Services			Total
Balance at December 31, 2010	$	329.5		$	71.4		$	400.9
Other Changes		4.8			.1			4.9
Balance at March 31, 2011		334.3			71.5			405.8
Goodwill Acquired		30.0			—			30.0
Other Changes		(.9	)		—			(.9	)
Balance at June 30, 2011	$	363.4		$	71.5		$	434.9
Goodwill Acquired		102.1			—			102.1
Other Changes		(2.8	)		(.1	)		(2.9	)
Balance at September 30, 2011	$	462.7		$	71.4		$	534.1

Note: Amounts include the effect of foreign exchange rates on non-U.S. dollar denominated goodwill.

29

Notes to Consolidated Financial Statements (continued)

Other intangible assets are included in other assets in the consolidated balance sheet. The gross carrying amount and accumulated amortization of other intangible assets subject to amortization at September 30, 2011 and December 31, 2010 were as follows:

	September 30,		December 31,
(In Millions)	2011		2010
Gross Carrying Amount	$	252.5	$	164.2
Less: Accumulated Amortization		122.5		111.0
Net Book Value	$	130.0	$	53.2

Note: Amounts include the effect of foreign exchange rates on non-U.S. dollar denominated intangible assets.

Other intangible assets consist primarily of the value of acquired client relationships. Amortization expense related to other intangible assets totaled $5.3 million and $3.4 million for the three months ended September 30, 2011 and 2010, respectively, and totaled $11.5 million and $11.0 million for the nine months ended September 30, 2011 and 2010, respectively. Amortization for the remainder of 2011 and for the years 2012, 2013, 2014, and 2015 is estimated to be $5.0 million, $21.0 million, $20.8 million, $20.7 million and $11.8 million, respectively.

On June 1, 2011, Northern Trust completed its acquisition of the fund administration, investment operations outsourcing and custody business of Bank of Ireland Securities Services (BoISS). The purchase price, which is subject to certain performance-related adjustments over a one year period after the acquisition date, totaled $84.4 million and was comprised of $71.0 million of cash and of $13.4 million of contingent consideration. Goodwill and other intangible assets associated with the acquisition totaled $30.0 million and $45.0 million, respectively.

On July 29, 2011, Northern Trust completed its acquisition of Omnium LLC, a hedge fund administrator. The purchase price, which is subject to certain performance-related adjustments over a five year period after the acquisition date, totaled $145.1 million and was comprised of $101.6 million of cash and $43.5 million of contingent consideration. Goodwill and other intangible assets associated with the acquisition totaled $102.1 million and $45.4 million, respectively.

30

Notes to Consolidated Financial Statements (continued)

9. 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, 2011 and 2010.

Three Months Ended	Corporate and						Personal Financial						Treasury and						Total
September 30,	Institutional Services						Services						Other						Consolidated
($ In Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Noninterest Income
Trust, Investment and Other Servicing Fees	$	310.9		$	293.2		$	244.4		$	225.5		$	—		$	—		$	555.3		$	518.7
Other		125.0			114.9			30.7			33.3			3.7			(10.9	)		159.4			137.3
Net Interest Income (FTE)*		71.2			67.2			157.1			151.0			38.3			24.8			266.6			243.0
Revenues*		507.1			475.3			432.2			409.8			42.0			13.9			981.3			899.0
Provision for Credit Losses		(1.9	)		(2.8	)		19.4			32.8			—			—			17.5			30.0
Noninterest Expenses		375.8			330.6			300.6			274.6			24.8			16.9			701.2			622.1
Income before Income Taxes*		133.2			147.5			112.2			102.4			17.2			(3.0	)		262.6			246.9
Provision for Income Taxes*		50.3			51.9			44.5			39.0			(2.6	)		.4			92.2			91.3
Net Income	$	82.9		$	95.6		$	67.7		$	63.4		$	19.8		$	(3.4	)	$	170.4			155.6
Percentage of Consolidated Net Income		49	%		61	%		40	%		41	%		11	%		(2	)%		100	%		100	%
Average Assets	$	49,755.5		$	38,701.2		$	23,809.5		$	23,495.9		$	20,464.7		$	12,509.6		$	94,029.7		$	74,706.7

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $9.8 million for 2011 and $9.5 million for 2010.

Nine Months Ended	Corporate and						Personal Financial						Treasury and						Total
September 30,	Institutional Services						Services						Other						Consolidated
($ In Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Noninterest Income
Trust, Investment and Other Servicing Fees	$	890.7		$	906.5		$	737.3		$	670.8		$	—		$	—		$	1,628.0		$	1,577.3
Other		373.8			384.9			94.9			100.0			(19.7	)		(7.3	)		449.0			477.6
Net Interest Income (FTE)*		199.1			207.9			456.6			439.3			112.4			78.3			768.1			725.5
Revenues*		1,463.6			1,499.3			1,288.8			1,210.1			92.7			71.0			2,845.1			2,780.4
Provision for Credit Losses		(18.8	)		(11.3	)		61.3			131.3			—			—			42.5			120.0
Noninterest Expenses		1,096.2			977.9			893.3			814.1			70.0			64.2			2,059.5			1,856.2
Income before Income Taxes*		386.2			532.7			334.2			264.7			22.7			6.8			743.1			804.2
Provision for Income Taxes*		147.4			187.7			132.7			100.5			(10.4	)		3.6			269.7			291.8
Net Income	$	238.8		$	345.0		$	201.5		$	164.2		$	33.1		$	3.2		$	473.4			512.4
Percentage of Consolidated Net Income		50	%		67	%		43	%		32	%		7	%		1	%		100	%		100	%
Average Assets	$	47,079.8		$	37,775.9		$	23,696.1		$	23,527.4		$	19,148.3		$	13,322.8		$	89,924.2		$	74,626.1

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $30.8 million for 2011 and $28.8 million for 2010.

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.

31

Notes to Consolidated Financial Statements (continued)

10. Accumulated Other Comprehensive Income (Loss) – The following tables summarize the components of accumulated other comprehensive income (loss) at September 30, 2011 and 2010, and changes during the three and nine month periods then ended.

	Three Months Ended September 30, 2011												Three Months Ended September 30, 2010
	Beginning									Ending			Beginning									Ending
	Balance									Balance			Balance									Balance
	(Net of			Before Tax			Tax			(Net of			(Net of			Before Tax			Tax			(Net of
(In Millions)	Tax)			Amount			Effect			Tax)			Tax)			Amount			Effect			Tax)
Noncredit-Related Unrealized Losses on Securities OTTI	$	(13.6	)	$	(.4	)	$	.1		$	(13.9	)	$	(35.1	)	$	18.7		$	(6.9	)	$	(23.3	)
Other Unrealized Gains (Losses) on Securities Available for Sale, net		27.6			32.5			(12.3	)		47.8			14.0			(9.9	)		3.8			7.9
Reclassification Adjustments		6.3			2.3			(.8	)		7.8			(.2	)		13.5			(5.1	)		8.2
Net Unrealized Gains (Losses) on Securities Available for Sale		20.3			34.4			(13.0	)		41.7			(21.3	)		22.3			(8.2	)		(7.2	)
Unrealized Gains (Losses) on Cash Flow Hedge Designations		21.3			(24.6	)		9.2			5.9			(17.6	)		43.2			(15.9	)		9.7
Reclassification Adjustments		(2.9	)		(1.9	)		.7			(4.1	)		1.8			7.1			(2.6	)		6.3
Net Unrealized Gains (Losses) on Cash Flow Hedge Designations		18.4			(26.5	)		9.9			1.8			(15.8	)		50.3			(18.5	)		16.0
Foreign Currency Translation Adjustments		2.4			31.2			(30.0	)		3.6			14.3			(44.2	)		44.7			14.8
Pension and Other Postretirement Benefit Adjustments		(296.4	)		—			—			(296.4	)		(303.3	)		—			—			(303.3	)
Reclassification Adjustments		12.0			7.6			(2.8	)		16.8			10.8			6.1			(3.3	)		13.6
Total Pension and Other Postretirement Benefit Adjustments		(284.4	)		7.6			(2.8	)		(279.6	)		(292.5	)		6.1			(3.3	)		(289.7	)
Accumulated Other Comprehensive Income (Loss)	$	(243.3	)	$	46.7		$	(35.9	)	$	(232.5	)	$	(315.3	)	$	34.5		$	14.7		$	(266.1	)

	Nine Months Ended September 30, 2011												Nine Months Ended September 30, 2010
	Beginning									Ending			Beginning								Ending
	Balance									Balance			Balance								Balance
	(Net of			Before Tax			Tax			(Net of			(Net of			Before Tax		Tax			(Net of
(In Millions)	Tax)			Amount			Effect			Tax)			Tax)			Amount		Effect			Tax)
Noncredit-Related Unrealized Losses on Securities OTTI	$	(21.2	)	$	11.5		$	(4.2	)	$	(13.9	)	$	(42.0	)	$	29.6	$	(10.9	)	$	(23.3	)
Other Unrealized Gains (Losses) on Securities Available for Sale, net		7.7			64.2			(24.1	)		47.8			.3			11.9		(4.3	)		7.9
Reclassification Adjustments		—			12.4			(4.6	)		7.8			—			13.1		(4.9	)		8.2
Net Unrealized Gains (Losses) on Securities Available for Sale		(13.5	)		88.1			(32.9	)		41.7			(41.7	)		54.6		(20.1	)		(7.2	)
Unrealized Gains (Losses) on Cash Flow Hedge Designations		11.4			(8.8	)		3.3			5.9			(26.2	)		56.9		(21.0	)		9.7
Reclassification Adjustments		—			(6.5	)		2.4			(4.1	)		—			9.9		(3.6	)		6.3
Net Unrealized Gains (Losses) on Cash Flow Hedge Designations		11.4			(15.3	)		5.7			1.8			(26.2	)		66.8		(24.6	)		16.0
Foreign Currency Translation Adjustments		(7.0	)		19.7			(9.1	)		3.6			11.3			19.5		(16.0	)		14.8
Pension and Other Postretirement Benefit Adjustments		(296.2	)		(.3	)		.1			(296.4	)		(305.0	)		2.2		(.5	)		(303.3	)
Reclassification Adjustments		—			22.6			(5.8	)		16.8			—			18.7		(5.1	)		13.6
Total Pension and Other Postretirement Benefit Adjustments		(296.2	)		22.3			(5.7	)		(279.6	)		(305.0	)		20.9		(5.6	)		(289.7	)
Accumulated Other Comprehensive Income (Loss)	$	(305.3	)	$	114.8		$	(42.0	)	$	(232.5	)	$	(361.6	)	$	161.8	$	(66.3	)	$	(266.1	)

32

Notes to Consolidated Financial Statements (continued)

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions Except Share Information)	2011		2010		2011		2010
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding		240,991,491		242,124,461		241,529,793		241,966,279
Net Income	$	170.4	$	155.6	$	473.4	$	512.4
Net Income Applicable to Common Stock		170.4		155.6		473.4		512.4
Less: Earnings Allocated to Participating Securities		2.0		1.3		5.5		4.2
Earnings Allocated to Common Shares Outstanding	$	168.4	$	154.3	$	467.9	$	508.2
Basic Net Income Per Common Share		.70		.64		1.94		2.10
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding		240,991,491		242,124,461		241,529,793		241,966,279
Plus Stock Option Dilution		202,502		33,966		488,957		455,382
Average Common and Potential Common Shares		241,193,993		242,158,427		242,018,750		242,421,661
Earnings Allocated to Common and Potential Common Shares	$	168.4	$	154.3	$	467.9	$	508.2
Diluted Net Income Per Common Share		.70		.64		1.93		2.10

Note: Common stock equivalents totaling 15,650,249 and 12,420,777 for the three and nine months ended September 30, 2011, respectively, and 6,860,298 and 7,958,582 for the three and nine months ended September 30, 2010, respectively, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive.

12. Net Interest Income – The components of net interest income were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions)	2011		2010		2011		2010
Interest Income
Loans and Leases	$	229.8	$	231.9	$	719.5	$	687.0
Securities – Taxable		54.8		47.7		160.4		142.5
– Non-Taxable		6.1		7.3		19.1		22.1
Interest-Bearing Deposits with Banks		49.2		40.2		131.6		100.8
Federal Reserve Deposits and Other		7.2		3.1		23.2		10.0
Total Interest Income		347.1		330.2		1,053.8		962.4
Interest Expense
Deposits		50.1		53.7		187.0		135.1
Federal Funds Purchased		.1		1.0		1.8		3.9
Securities Sold Under Agreements to Repurchase		.1		.2		.6		.7
Other Borrowings		1.4		1.4		4.3		4.0
Senior Notes		16.4		11.5		47.6		34.4
Long-Term Debt		21.6		28.1		73.4		85.8
Floating Rate Capital Debt		.6		.8		1.8		1.8
Total Interest Expense		90.3		96.7		316.5		265.7
Net Interest Income	$	256.8	$	233.5	$	737.3	$	696.7

13. Visa Membership – In connection with the initial public offering of shares by Visa Inc. in 2007, Northern Trust, in conjunction with other member banks of Visa U.S.A Inc. (Visa U.S.A.), is obligated to share in losses resulting from certain indemnified litigation involving Visa and is also required to recognize, at its estimated fair value in accordance with GAAP, a guarantee liability arising from such litigation that has not yet settled.

33

Notes to Consolidated Financial Statements (continued)

Northern Trust’s net Visa related indemnification liability, included within other liabilities in the consolidated balance sheet, totaled $13.0 million at September 30, 2011 and $23.1 million at December 31, 2010.

Visa has established an escrow account to cover the settlements of, or judgments in, the indemnified litigation. The funding by Visa of its escrow account has resulted in reductions of the future realization of the value of outstanding shares of Visa common stock held by Northern Trust as a member bank of Visa U.S.A. These shares are recorded at their original cost basis of zero and have restrictions as to their sale or transfer. It is expected that additional contributions by Visa to the litigation escrow account will result in additional adjustments to the future realization of the value of the outstanding Visa shares. While the ultimate resolution of outstanding Visa related litigation is highly uncertain and the estimation of any potential losses is highly judgmental, Northern Trust anticipates that the value of its remaining shares of Visa stock will be more than adequate to offset any remaining indemnification liabilities related to Visa litigation.

14. Income Taxes – Income tax expense of $82.4 million was recorded in the current quarter, representing an effective tax rate of 32.6%. The prior year quarter provision for income taxes was $81.8 million, representing an effective tax rate of 34.5%. The current quarter’s effective tax rate reflects a higher portion of income being generated in jurisdictions with lower tax rates than the U.S.

As part of its audit of federal tax returns filed from 1997-2004, the Internal Revenue Service (IRS) challenged the Corporation’s tax position with respect to certain structured leasing transactions and proposed to disallow certain tax deductions and assess related interest and penalties. In September 2009, the Corporation reached a settlement agreement with the IRS with respect to certain of these transactions. The Corporation is in settlement discussions with the IRS Appeals Office regarding the remaining disputed structured leasing transactions. The IRS may continue to disallow deductions relating to the remaining challenged leases and possibly include other lease transactions with similar characteristics as part of its audit of tax returns filed after 2004. The Corporation believes that these transactions are valid leases for U.S. tax purposes and that its tax treatment of these transactions is appropriate based on its interpretation of the tax regulations and legal precedents; a court or other judicial authority, however, could disagree. The Corporation believes it has appropriate reserves to cover its tax liabilities, including liabilities related to structured leasing transactions, and related interest and penalties. Northern Trust has deposits with the IRS to mitigate interest that would become due should the IRS prevail on the remaining tax positions.

There have been no changes to the December 31, 2010 leveraged lease related uncertain tax position balance of $66.7 million. In light of the settlement discussions with the IRS Appeals Office, it is anticipated that the remaining unrecognized tax benefits related to leasing transactions will be settled by early 2012. It is possible that additional changes in the amount of leveraged lease related uncertain tax positions and related cash flows

34

Notes to Consolidated Financial Statements (continued)

could occur in the next twelve months if Northern Trust terminates some or all of these leases, is not able to resolve this matter with the IRS, or if management becomes aware of new information that would lead it to change its assumptions regarding the timing or amount of any potential payments to the IRS. Management does not believe that future changes, if any, would have a material effect on the consolidated financial position or liquidity of Northern Trust, although they could have a material effect on operating results for a particular period.

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, 2011 and 2010.

Net Periodic Pension Expense U.S. Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2011			2010			2011			2010
Service Cost	$	10.7		$	9.5		$	32.1		$	28.5
Interest Cost		10.2			9.2			30.6			27.6
Expected Return on Plan Assets		(19.7	)		(18.3	)		(59.1	)		(54.9	)
Amortization
Net Loss		6.5			5.0			19.5			15.0
Prior Service Cost		.4			.4			1.2			1.2
Net Periodic Pension Expense	$	8.1		$	5.8		$	24.3		$	17.4

Net Periodic Pension Expense Non U.S. Plans	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2011			2010			2011			2010
Service Cost	$	—		$	.2		$	—		$	1.8
Interest Cost		1.6			1.9			4.9			5.2
Expected Return on Plan Assets		(2.1	)		(2.3	)		(6.2	)		(6.2	)
Net Loss Amortization		.1			.1			.1			.5
Gain on Curtailment of Non-U.S. Plan		—			—			—			(2.2	)
Net Periodic Pension Benefit	$	(.4	)	$	(.1	)	$	(1.2	)	$	(.9	)

Net Periodic Pension Expense Supplemental Plan	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2011		2010		2011		2010
Service Cost	$	.8	$	.8	$	2.4	$	2.4
Interest Cost		1.1		1.2		3.3		3.6
Amortization
Net Loss		1.4		1.5		4.2		4.5
Prior Service Cost		.1		—		.3		—
Net Periodic Pension Expense	$	3.4	$	3.5	$	10.2	$	10.5

Net Periodic Benefit Expense Other Postretirement Plan	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2011			2010			2011			2010
Service Cost	$	.1		$	.2		$	.3		$	.6
Interest Cost		.7			.7			2.1			2.1
Amortization
Net Loss		.4			.5			1.2			1.5
Prior Service Cost		(1.3	)		(1.3	)		(3.9	)		(3.9	)
Net Periodic Benefit Expense (Benefit)	$	(.1	)	$	.1		$	(.3	)	$	.3

35

Notes to Consolidated Financial Statements (continued)

16. Share-Based Compensation Plans – The Amended and Restated Northern Trust Corporation 2002 Stock Plan provides for the grant of nonqualified stock options, incentive stock options, stock appreciation rights, stock awards, stock units, and performance shares. Total compensation expense for share-based payment arrangements and the associated tax impacts were as follows for the periods presented:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions)	2011		2010		2011		2010
Stock Options	$	6.3	$	5.3	$	27.8	$	22.6
Stock and Stock Unit Awards		9.4		6.1		26.6		18.3
Total Share-Based Compensation Expense		15.7		11.4		54.4		40.9
Tax Benefits Recognized	$	5.8	$	4.2	$	20.2	$	15.0

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

Leveraged Leases. In leveraged leasing transactions, Northern Trust acts as lessor of the underlying asset subject to the lease and typically funds 20% of the asset’s cost via an equity ownership in a trust with the remaining 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, 2011 and December 31, 2010, the carrying amounts of these investments, which are included in loans and leases in the consolidated balance sheet, were $743.8 million and $782.3 million, respectively. The Corporation’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 the Corporation to a loss.

36

Notes to Consolidated Financial Statements (continued)

Tax Credit Structures. Northern Trust invests in affordable housing projects that are designed to generate a return primarily through the realization of tax credits. The affordable housing projects are formed as limited partnerships and LLCs, and Northern Trust typically invests as a limited partner/investor member in the form of equity contributions. The economic performance of the affordable housing projects, which are deemed to be VIEs, is driven by the performance of their underlying investment projects as well as the VIEs’ 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 affordable housing projects as it lacks the power to direct the activities that most significantly impact the economic performance of the underlying project or to affect the VIEs’ 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 affordable housing projects is limited to the carrying amounts of its investments, including any unfunded commitments. As of September 30, 2011 and December 31, 2010, the carrying amounts of these investments, which are included in other assets in the consolidated balance sheet, were $252.3 million and $265.4 million, respectively. As of September 30, 2011 and December 31, 2010, liabilities related to unfunded commitments, which are included in other liabilities in the consolidated balance sheet, were $35.7 million and $35.5 million, respectively. Northern Trust’s funding requirements are limited to its invested capital and any additional unfunded commitments for future equity contributions. Northern Trust has no other liquidity arrangements or obligations to purchase assets of the affordable housing projects that would expose it to a loss.

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 the 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.

37

Notes to Consolidated Financial Statements (continued)

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 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. Certain standby letters of credit have been secured with cash deposits or participated to others and in certain cases Northern Trust is able to recover the amounts paid through recourse against these cash deposits or other participants. Standby letters of credit outstanding were $4.4 billion at September 30, 2011 and $4.3 billion at December 31, 2010. Northern Trust’s liability included within the consolidated balance sheet for standby letters of credit, measured as the amount of unamortized fees on these instruments, was $46.7 million at September 30, 2011 and $36.7 million at December 31, 2010.

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 by the Northern Trust Senior Credit Committee. In connection with these activities, Northern Trust has issued indemnifications against certain losses resulting from the bankruptcy of borrowers of securities. Borrowers are required to fully collateralize 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 $78.1 billion at September 30, 2011 and $74.9 billion at December 31, 2010. Because of the credit quality of the borrowers and the requirement to fully collateralize securities borrowed, management believes that the exposure to credit loss from this activity is not significant and no liability was recorded at September 30, 2011 or December 31, 2010 related to these indemnifications.

As discussed in further detail in Note 13, Northern Trust, as a member bank of Visa U.S.A., and in conjunction with other member banks, is required to recognize, at its estimated fair value in accordance with GAAP, a guarantee liability arising from such litigation that has not yet settled. The estimated fair value of the net Visa indemnification liability, recorded within other liabilities in the consolidated balance sheet, totaled $13.0 million at September 30, 2011 and $23.1 million at December 31, 2010.

38

Notes to Consolidated Financial Statements (continued)

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 cases in which the Corporation is able to estimate a range of reasonably possible loss mean the upper end of the range of loss for cases for which the Corporation believes the risk of loss is more than remote.

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, or (vi) 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.

39

Notes to Consolidated Financial Statements (continued)

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, 2011, the Corporation has estimated the upper end of the range of reasonably possible losses for these matters to be approximately $31 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. The following is a description of the nature of certain of these matters.

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 putative 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). Based on our review of these matters, we believe we operated our securities lending program prudently and appropriately. The Corporation has also been cooperating fully with an SEC investigation related to our securities lending program. At this stage of these proceedings, it is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss.

On January 16, 2009, an amended complaint was filed in a putative class action lawsuit currently pending in the United States District Court for the Northern District of Illinois against the Corporation and others. The defendants named in the amended complaint are the Corporation, The Northern Trust Company, the Northern Trust Employee Benefits Administrative Committee and its members, the Northern Trust Employee Benefits Investment Committee and its members, and certain other officers, including the present and former Chief Executive Officers of the Corporation, purportedly on behalf of participants in and beneficiaries of The Northern Trust Company Thrift-Incentive Plan (the “Plan”) whose individual accounts held shares of Corporation common stock at any time from October 19, 2007 to January 14, 2009. The complaint purports to allege breaches of fiduciary duty in violation of ERISA related to the Corporation’s stock being offered as an investment alternative for participants in the Plan and seeks monetary damages in an unspecified amount. On September 14, 2011, the parties filed a stipulation voluntarily dismissing the complaint; that stipulation is without prejudice to the claims of the members of the putative class other than the four named plaintiffs, whose claims were released and discharged.

40

Notes to Consolidated Financial Statements (continued)

On August 24, 2010, a lawsuit (hereinafter referred to as the “Securities Class Action”) was filed in federal court in the Northern District of Illinois against the Corporation and three of its present or former officers, including the present and former Chief Executive Officers of the Corporation, on behalf of a purported class of purchasers of Corporation stock during the period from October 17, 2007 to October 20, 2009. The amended complaint alleges that during the purported class period the defendants violated Sections 10(b) and 20(a) of the Exchange Act by allegedly taking insufficient provisions for credit losses with respect to the Corporation’s real estate loan portfolio and failing to make sufficient disclosures regarding its securities lending business. Plaintiff seeks compensatory damages in an unspecified amount. At this stage of the suit, it is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss.

On September 7, 2010, a shareholder derivative lawsuit, purportedly brought on behalf of the Corporation, was filed in the Circuit Court of Cook County, Illinois against a number of the Corporation’s current and former officers and directors. The Corporation is named as a nominal defendant. The complaint asserts that the individual defendants violated their fiduciary duties to the Corporation based upon substantially the same allegations made in the Securities Class Action complaint. Certain individual defendants are also alleged to have sold some of their holdings of Northern Trust Corporation stock while in possession of material nonpublic information. Plaintiff seeks compensatory damages in an unspecified amount from the individual defendants on behalf of the Corporation. The only relief sought against the Corporation is an order requiring the implementation of certain corporate governance procedures.

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.

The estimated credit risk associated with derivative instruments relates to the failure of the counterparty and the failure of Northern Trust to pay based on the contractual terms of the agreement, and is generally limited to the unrealized fair value gains and losses on these instruments, respectively. The amount of credit risk will increase or decrease during the lives of the instruments as interest rates, foreign exchange rates, or credit spreads

41

Notes to Consolidated Financial Statements (continued)

fluctuate. This 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 Annex agreements are currently in place with a number of 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 on 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 agreements exist between Northern Trust and the counterparty. Derivative assets and liabilities recorded on the consolidated balance sheet were each reduced by $2.1 billion as of September 30, 2011 and by $1.8 billion as of December 31, 2010, as a result of master netting agreements in place. Derivative assets and liabilities recorded at September 30, 2011 also reflect reductions of $.1 billion and $1.6 billion, respectively, as a result of cash collateral received from and deposited with derivative counterparties. This compares with reductions of derivative assets and liabilities of $2.6 billion and $3.0 billion, respectively, at December 31, 2010. Additional cash collateral received from and deposited with derivative counterparties totaling $2.8 million and $185.2 million, respectively, as of September 30, 2011, and $9.9 million and $.5 million, respectively, as of December 31, 2010, were not offset against derivative assets and liabilities on the consolidated balance sheet as the amounts exceeded the net derivative positions with those counterparties.

Certain master netting agreements 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 the 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 $.5 billion and $3.3 billion on September 30, 2011 and December 31, 2010, respectively. Cash collateral amounts deposited with derivative counterparties on those dates included $.4 billion and $2.9 billion, respectively, posted against these liabilities, resulting in a net maximum amount of termination payments that could have been required at September 30, 2011 and December 31, 2010 of $.1 million and $387.1 million, respectively. Accelerated settlement of these liabilities would not have a material effect on the consolidated financial position or liquidity of Northern Trust.

42

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, option, and forward 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 utilizes 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 consist of caps, floors, and swaptions, and provide for the transfer or reduction of interest rate risk 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 option contracts for risk management purposes. Northern Trust enters into interest rate forward contracts to lend funds to a potential borrower at a specified interest rate within a specified period of time. These forward contracts are derivative instruments if the loans that will result from the exercise of the commitments will be held for sale.

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. In excess of 97% of Northern Trust’s derivatives outstanding at September 30, 2011 and December 31, 2010, 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 amounts 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.

43

Notes to Consolidated Financial Statements (continued)

	September 30, 2011						December 31, 2010
	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	270,614.5	$	5,202.9	$	5,190.0	$	242,007.1	$	5,747.9	$	5,729.9
Interest Rate Option Contracts		100.7		—		—		126.1		.1		.1
Interest Rate Swap Contracts		4,468.9		193.6		189.5		4,301.7		151.2		148.4
Total	$	275,184.1	$	5,396.5	$	5,379.5	$	246,434.9	$	5,899.2	$	5,878.4

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, 2011 and 2010.

	Location of	Amount of Derivative Gain/(Loss) Recognized in Income
	Derivative Gain/ (Loss) Recognized	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	in Income	2011		2010		2011		2010
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	87.2	$	89.0	$	252.8	$	284.0
Interest Rate Swap and Option Contracts	Security Commissions and Trading Income		1.0		3.0		3.9		5.7
Total		$	88.2	$	92.0	$	256.7	$	289.7

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, therefore, are accounted for as trading instruments.

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 expected to occur, 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 designated as hedges and used by Northern Trust to manage risk, their notional and fair values, and the respective risks addressed.

44

Notes to Consolidated Financial Statements (continued)

			September 30, 2011						December 31, 2010
	Derivative	Risk	Notional		Fair Value				Notional		Fair Value
(In Millions)	Instrument	Classification	Value		Asset		Liability		Value		Asset		Liability
Fair Value Hedges
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate	$	1,682.0	$	2.0	$	42.3	$	860.0	$	4.8	$	14.9
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Rate		1,100.0		152.4		.4		1,100.0		129.8		.4
Cash Flow Hedges
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		923.9		11.1		18.5		935.3		19.3		15.2
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate		500.0		—		.1		—		—		—
Net Investment Hedges
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		1,452.3		3.7		3.1		1,390.1		13.0		18.3
Total			$	5,658.2	$	169.2	$	64.4	$	4,285.4	$	166.9	$	48.8

In addition to the above, Sterling denominated debt, totaling $240.7 million and $241.8 million at September 30, 2011 and December 31, 2010, 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, 2011 and 2010.

			Amount of Derivative Gain/(Loss) Recognized in Income
	Derivative	Location of Derivative Gain/(Loss) Recognized	Three Months Ended September 30,						Nine Month Ended September 30,
(In Millions)	Instrument	in Income	2011			2010			2011			2010
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Income	$	(27.0	)	$	(10.2	)	$	(53.2	)	$	(21.8	)
Senior Notes and Long -Term Subordinated Debt	Interest Rate Swap Contracts	Interest Expense		39.0			33.3			190.4			104.5
Total			$	12.0		$	23.1		$	137.2		$	82.7

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 were $.1 million and $.2 million of changes recorded in the fair values of the hedged items for such “long-haul” hedges during the three months ended

45

Notes to Consolidated Financial Statements (continued)

September 30, 2011 and 2010; and $.4 million and $.2 million changes recorded in the fair value during the nine months ended September 30, 2011 and 2010, respectively. There was $.1 million and $.4 million of ineffectiveness recorded during the three and nine months ended September 30, 2011, respectively, and $.1 million ineffectiveness recorded during the three months and nine months ended September 30, 2010 for available for sale investment securities, senior notes, and subordinated debt.

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 to the accounting for the hedged item. When the hedged forecasted transaction impacts earnings, balances in AOCI are reclassified to the same income or expense classification as the hedged item. Northern Trust assesses effectiveness using regression analysis for cash flow hedges of available for sale securities. Ineffectiveness is measured using the hypothetical derivative method. For cash flow hedges of 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. 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, 2011 and 2010. As of September 30, 2011, twenty-three 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 table provides 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, 2011 and 2010.

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)
Three Months Ended September 30,	2011			2010			2011		2010
Net Gain/(Loss) Recognized in AOCI	$	(24.8	)	$	43.2		$	.2	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Trust, Investment and Other Servicing Fees		.7			.4			—		—
Other Operating Income		(.2	)		(.1	)		—		—
Interest Income		(.2	)		(.1	)		.1		—
Interest Expense		—			—			—		—
Compensation		.6			.1			—		—
Employee Benefits		.2			.1			—		—
Equipment and Software		—			—			—		—
Occupancy Expense		.1			.2			—		—
Other Operating Expense		.6			(1.5	)		—		—
Total	$	1.8		$	(.9	)	$	.1	$	—

46

Notes to Consolidated Financial Statements (continued)

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)
Nine Months Ended September 30,	2011			2010			2011		2010
Net Gain/(Loss) Recognized in AOCI	$	(9.0	)	$	56.9		$	.2	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Trust, Investment and Other Servicing Fees		1.0			10.2			—		—
Other Operating Income		0			.3			—		—
Interest Income		(1.0	)		2.0			.1		—
Interest Expense		—			.1			—		—
Compensation		3.0			(8.4	)		—		—
Employee Benefits		.9			(2.2	)		—		—
Equipment and Software		.1			(.1	)		—		—
Occupancy Expense		.5			(1.1	)		—		—
Other Operating Expense		1.9			(4.5	)		—		—
Total	$	6.4		$	(3.7	)	$	.1	$	—

During the three and nine months ended September 30, 2011 there were no transactions discontinued due to the original forecasted transactions no longer being probable of occurring. During the three and nine months ended September 30, 2010, $6.3 million of net foreign exchange contract losses were reclassified into earnings as a result of the discontinuance of cash flow hedges as it was no longer probable that the original forecasted transactions would occur. It is estimated that a net loss of $4.8 million will be reclassified into earnings within the next twelve months relating to cash flow hedges.

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 eliminate hedge ineffectiveness. As a result, no ineffectiveness was recorded for these hedges during the three and nine months ended September 30, 2011 and 2010. 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, 2011 and 2010.

	Amount of Hedging Gain/(Loss) Recognized in OCI (Before Tax)
	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	2011		2010			2011			2010
Foreign Exchange Contracts	$	75.6	$	(109.1	)	$	(1.9	)	$	29.6
Sterling Denominated Subordinated Debt		5.7		(6.9	)		(2.2	)		3.5
Sterling Denominated Senior Debt		—		(5.8	)		—			10.5
Total	$	81.3	$	(121.8	)	$	(4.1	)	$	43.6

47

Notes to Consolidated Financial Statements (continued)

Derivatives not formally designated as hedges under GAAP are entered into to manage the foreign currency risk of non-U.S. dollar denominated assets and liabilities and the credit risk and interest rate risk of loans and loan commitments. The following table identifies the types and classifications of risk management derivative instruments not formally designated as hedges, their notional and fair values, and the respective risks addressed.

			September 30, 2011						December 31, 2010
	Derivative	Risk	Notional		Fair Value				Notional		Fair Value
(In Millions)	Instrument	Classification	Value		Asset		Liability		Value		Asset		Liability
Commercial Loans and Loan Commitments	Credit Default Swap Contracts	Credit	$	85.5	$	—	$	0.4	$	149.5	$	—	$	2.8
Loan Commitments	Forward Contracts	Interest Rate		1.1		—		—		14.3		.5		.2
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		194.1		4.2		5.1		616.1		12.3		16.2
Commercial Loans	Foreign Exchange Contracts	Foreign Currency		141.9		4.2		.1		60.6		.1		.9
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		57.2		.5		—		61.3		.2		.8
Total			$	479.8	$	8.9	$	5.6	$	901.8	$	13.1	$	20.9

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, 2011 and 2010.

	Location of Derivative Gain/	Amount of Derivative Gain/(Loss) Recognized in Income
	(Loss) Recognized	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	in Income	2011		2010			2011			2010
Credit Default Swap Contracts	Other Operating Income	$	1.1	$	(1.6	)	$	.3		$	(1.2	)
Forward Contracts	Other Operating Income		—		—			.2			—
Foreign Exchange Contracts	Other Operating Income		6.1		(14.7	)		(5.8	)		(8.1	)
Total		$	7.2	$	(16.3	)	$	(5.3	)	$	(9.3	)

20. Debt Issuance – On August 22, 2011, Northern Trust sold $500 million of 3.375% fixed-rate senior notes due August 23, 2021. The senior notes are non-callable and unsecured and were sold at a .437% discount. Northern Trust intends to use the proceeds of the offering for general corporate purposes.

48

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

THIRD QUARTER CONSOLIDATED RESULTS OF OPERATIONS

Overview

Net income for the third quarter of 2011 totaled $170.4 million compared with $155.6 million in the third quarter of 2010. Net income per common share on a diluted basis was $.70 compared with $.64 in the prior year quarter.

The performance in the current quarter produced an annualized return on average common equity (ROE) of 9.53% and an annualized return on average assets (ROA) of .72%, which compare to an ROE and ROA of 9.23% and .83%, respectively, reported for the prior year quarter.

Consolidated revenue of $971.5 million increased $82.0 million, or 9%, in the current quarter from $889.5 million in the prior year quarter. Noninterest income, which represented 74% of revenue, increased $58.7 million, or 9%, to $714.7 million from the prior year quarter’s $656.0 million. Trust, investment and other servicing fees, which represented 57% of current quarter revenue, were $555.3 million in the current quarter compared to $518.7 million in the prior year quarter, an increase of $36.6 million, or 7%.

Net interest income for the quarter on a fully taxable equivalent (FTE) basis increased $23.6 million, or 10%, to $266.6 million compared to $243.0 million in the prior year quarter. Net interest income stated on an FTE basis is a non-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 70.

Noninterest expense totaled $701.2 million for the current quarter, an increase of $79.1 million, or 13%, from $622.1 million in the prior year quarter. Excluding current quarter operating expenses associated with recent acquisitions, and restructuring, acquisition, and integration related charges, noninterest expense increased $44.2 million, or 7%.

Noninterest Income

The components of noninterest income are provided below.

Noninterest Income	Three Months Ended September 30,
($ In Millions)	2011			2010			Change
Trust, Investment and Other Servicing Fees	$	555.3		$	518.7		$	36.6		7	%
Foreign Exchange Trading Income		87.2			88.9			(1.7	)	(2	)
Treasury Management Fees		17.8			19.3			(1.5	)	(7	)
Security Commissions and Trading Income		13.9			14.9			(1.0	)	(6	)
Other Operating Income		42.5			27.7			14.8		53
Investment Security Gains (Losses), net		(2.0	)		(13.5	)		11.5		(85	)
Total Noninterest Income	$	714.7		$	656.0		$	58.7		9	%

49

Noninterest Income (continued)

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 in arrears. Certain investment management fee arrangements also may provide for performance fees based on client portfolio returns that exceed predetermined levels. Securities lending fees in the prior year quarter included Northern Trust’s share of unrealized investment gains and losses in one investment fund that is used in our securities lending activities and is accounted for at fair value. As of September 30, 2010, securities in the mark-to-market fund had been sold with the proceeds reinvested into a short duration fund, eliminating the mark-to-market impact on securities lending revenue in periods subsequent to the date of sale. Based on an analysis of historical trends and current asset and product mix, management estimates that a 10% rise or fall in overall equity markets would cause a corresponding increase or decrease in Northern Trust’s trust, investment and other servicing fees of approximately 3% and in total revenues of approximately 2%.

							Change			Change
Assets Under Custody	September 30, 2011		June 30, 2011		September 30, 2010		Q3 11/ Q3 10			Q3 11/ Q2 11
($ In Billions)
Corporate and Institutional	$	3,813.3	$	4,028.1	$	3,557.8		7	%		(5	)%
Personal		358.8		387.8		349.1		3			(7	)
Total	$	4,172.1	$	4,415.9	$	3,906.9		7	%		(6	)%

							Change			Change
Assets Under Management	September 30, 2011		June 30, 2011		September 30, 2010		Q3 11/ Q3 10/			Q3 11/ Q2 11
($ In Billions)
Corporate and Institutional	$	481.0	$	512.1	$	508.6		(5	)%		(6	)%
Personal		163.2		172.0		148.6		10			(5	)
Total	$	644.2	$	684.1	$	657.2		(2	)%		(6	)%

Corporate & Institutional Services (C&IS) assets under custody totaled $3.8 trillion, up 7% from the prior year quarter, and included $2.3 trillion of global custody assets, 10% higher compared to the prior year quarter. C&IS assets under management included $100.0 billion of securities lending collateral, an 11% decrease from the prior year quarter. Changes in assets under custody and under management are in comparison to the twelve month decline in the S&P 500 index of 1% and the EAFE index (USD) of 12%.

50

Noninterest Income (continued)

Custodied and managed assets at the current and prior year quarter ends were invested as follows:

	September 30, 2011									September 30, 2010
Assets Under Custody	C&IS			PFS			Consolidated			C&IS			PFS			Consolidated
Equities		43	%		42	%		43	%		47	%		43	%		47	%
Fixed Income Securities		38			29			37			36			28			35
Cash and Other Assets		19			29			20			17			29			18

	September 30, 2011									September 30, 2010
Assets Under Management	C&IS			PFS			Consolidated			C&IS			PFS			Consolidated
Equities		45	%		33	%		42	%		46	%		34	%		44	%
Fixed Income Securities		15			33			19			16			35			20
Cash and Other Assets		40			34			39			38			31			36

Trust, investment and other servicing fees from C&IS increased $17.7 million, or 6%, totaling $310.9 million compared to the prior year quarter’s $293.2 million. The increase in C&IS trust, investment and other servicing fees primarily reflects recent acquisitions, new business, and improved markets, partially offset by a decrease in securities lending revenue.

C&IS Trust, Investment and Other Servicing Fees	Three Months Ended September 30,
($ In Millions)	2011		2010		Change
Custody and Fund Administration	$	205.6	$	159.2	$	46.4		29	%
Investment Management		64.6		60.7		3.9		6
Securities Lending		20.7		56.4		(35.7	)	(63	)
Other		20.0		16.9		3.1		18
Total	$	310.9	$	293.2	$	17.7		6	%

The 29% increase in C&IS custody and fund administration fees, the largest component of C&IS fees, primarily reflects the recent acquisitions, new business, and improved markets. C&IS investment management fees for the current quarter benefited from new business and improved markets, partially offset by waived fees in money market mutual funds due to the persistent low level of short-term interest rates. Money market mutual fund fee waivers in C&IS totaled $10.1 million in the current quarter compared with $2.5 million in the prior year quarter. Securities lending revenue in the prior year quarter included the recovery of previously recorded unrealized asset valuation losses of approximately $39 million in a mark-to-market investment fund used in securities lending activities. As of September 30, 2010, securities in the mark-to-market fund had been sold with the proceeds reinvested into a short duration fund, eliminating the mark-to-market impact on securities lending revenue in periods subsequent to the date of sale.

51

Noninterest Income (continued)

Trust, investment and other servicing fees from Personal Financial Services (PFS) totaled $244.4 million in the current quarter, increasing $18.9 million, or 8%, from $225.5 million in the prior year quarter. The increase in PFS fees was primarily the result of strong new business and improved markets, partially offset by waived fees in money market mutual funds which totaled $19.0 million in the current quarter compared with $10.4 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)	2011		2010			Change
Loan Service Fees	$	16.5	$	14.8		$	1.7		11	%
Banking Service Fees		13.8		14.4			(.6	)	(4	)
Currency Translation Gains (Losses), net		4.4		(7.9	)		12.3		N/M
Credit Default Swaps Gains (Losses), net		1.1		(1.2	)		2.3		N/M
Other Income		6.7		7.6			(.9	)	(12	)
Total Other Operating Income	$	42.5	$	27.7		$	14.8		53	%

The increase in other operating income was primarily attributable to gains recorded in the current quarter from currency translation as compared to currency translation losses incurred in the prior year quarter which included a $6.3 million loss resulting from the discontinuance of certain cash flow hedges.

Net investment security losses of $2.0 million were recorded in the current quarter compared to net losses of $13.5 million in the prior year quarter. The current and prior year quarters included $1.3 million and $14.0 million, respectively, of credit-related other-than-temporary impairment (OTTI) of residential mortgage-backed securities.

Net Interest Income

Net interest income for the current quarter totaled $256.8 million, $23.3 million, or 10%, higher than the $233.5 million reported in the prior year quarter, primarily attributable to an increase in average earning assets, somewhat offset by a decline in the net interest margin. 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 for the quarter, stated on an FTE basis, totaled $266.6 million, up $23.6 million, or 10%, from $243.0 million reported in the prior year quarter.

Average earning assets of $84.4 billion, up $17.4 billion, or 26%, compares to $67.0 billion in the prior year quarter, and the net interest margin, stated on an FTE basis, was 1.25%, down from 1.44% in the prior year quarter. The balance sheet grew primarily due to an increase in non-U.S. office interest-bearing deposits which were invested primarily in lower yielding investment securities, Federal Reserve deposits, and interest-bearing deposits with banks. Average investment securities increased $7.3 billion, or 36%, to $27.6 billion in the current quarter compared to $20.3 billion in the prior year quarter. Average Federal Reserve deposits and other interest-bearing balances totaled $10.8

52

Net Interest Income (continued)

billion, an increase of $6.3 billion compared to the prior year quarter’s average of $4.5 billion while average interest-bearing deposits with banks totaled $17.2 billion for the current quarter compared to $14.4 billion for the prior year quarter, an increase of $2.8 billion, or 20%. Loans and leases averaged $28.5 billion, an increase of $1.1 billion, or 4%, from $27.4 billion in the prior year quarter, primarily attributable to higher average short duration advances related to the processing of custodied client investments. Commercial and institutional loans averaged $6.3 billion in the current quarter, a $346.6 million, or 6% increase from prior year quarter’s average of $6.0 billion. Commercial real estate loans averaged $2.9 billion, down $393.8 million, or 12%, from the prior year quarter’s $3.3 billion. Residential real estate loans averaged $10.9 billion in both the current and prior year quarters. The current quarter residential real estate loan average balance represented 38% of the total average loan and lease portfolio. Private client loans averaged $5.4 billion, up $227.2 million, or 4%, from prior year quarter’s $5.1 billion.

Northern Trust utilizes a diverse mix of funding sources. Total interest-bearing deposits averaged $59.5 billion, up $12.8 billion, or 27%, from the prior year quarter’s average of $46.7 billion. The increase was attributable to higher average client balances in non-U.S. office interest-bearing deposits, which totaled $41.7 billion, an increase of $11.6 billion, or 38%, from $30.1 billion in the prior year quarter, and increased domestic savings and money market deposits, which totaled $14.1 billion, up $1.1 billion, or 9%, as compared to $13.0 billion in the prior year quarter. Other interest-related funds averaged $7.5 billion in the quarter, a decrease of $2.2 billion, or 23%, as compared to $9.7 billion in the prior year quarter, primarily due to lower levels of short-term borrowings. The balances within these 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. Net noninterest-related funds utilized to fund earning assets averaged $17.5 billion, an increase of $6.9 billion, or 66%, compared with $10.6 billion in the prior year quarter, resulting primarily from higher levels of U.S. office demand and other noninterest-bearing deposits.

Provision for Credit Losses

The provision for credit losses was $17.5 million in the third quarter compared with $30.0 million in the prior year quarter. The allowance for credit losses at September 30, 2011 was $334.6 million compared with $357.3 million at December 31, 2010, and $361.4 million at September 30, 2010. Net charge-offs totaled $28.6 million for the current quarter and $30.3 million in the prior year quarter. Nonperforming loans decreased $19.8 million as compared to the prior year quarter, reflecting improvement in commercial and institutional loans, partially offset by continued weakness in commercial real estate and residential real estate loans.

For additional discussion of the provision and allowance for credit losses, refer to the “Asset Quality” section below.

53

Noninterest Expense

The components of noninterest expense are provided below.

Noninterest Expense	Three Months Ended September 30,
($ In Millions)	2011		2010		Change
Compensation	$	311.1	$	273.3	$	37.8		14	%
Employee Benefits		66.7		60.0		6.7		11
Outside Services		139.7		110.7		29.0		26
Equipment and Software		76.3		72.6		3.7		5
Occupancy		45.4		42.6		2.8		7
Other Operating Expenses		62.0		62.9		(.9	)	(1	)
Total Noninterest Expense	$	701.2	$	622.1	$	79.1		13	%

The increase in noninterest expense primarily reflects increased compensation and outside services expense. Excluding current quarter operating expenses associated with recent acquisitions, and restructuring, acquisition, and integration related charges, noninterest expense increased $44.2 million, or 7%.

The increase in compensation expense, the largest component of noninterest expense, primarily reflects higher full-time equivalent staff levels, higher performance-based compensation, and annual salary increases. Staff on a full-time equivalent basis at September 30, 2011 totaled approximately 14,000, up 10% from a year ago.

The increase in employee benefit expense for the current quarter reflects higher staffing and increased federal and unemployment insurance and pension expense, including increases attributable to recent acquisitions.

The increase in outside services expense is primarily due to higher expense associated with technical and investment manager sub-advisory services.

Equipment and software expense increased from prior year quarter due to higher levels of depreciation expense from the continued investment in capital assets.

Other Operating Expense

The components of other operating expense are provided below.

Other Operating Expense	Three Months Ended September 30,
($ In Millions)	2011		2010		Change
Business Promotion	$	14.8	$	15.0	$	(.2	)	(1	)%
FDIC Insurance Premiums		8.8		5.7		3.1		54
Staff Related		9.1		3.6		5.5		153
Other Intangible Amortization		5.3		3.5		1.8		51
Other Expenses		24.0		35.1		(11.1	)	(32	)
Total Other Operating Expense	$	62.0	$	62.9	$	(.9	)	(1	)%

54

Other Operating Expense (continued)

The increase of $3.1 million in Federal Deposit Insurance Corporation premiums reflects an increase in the accrual for premiums as a result of higher average assets. Staff related expense in the prior year quarter included a reduction of an expense accrual related to a tax on bonus payments to employees in the United Kingdom. The decrease in the other expenses component of other operating expense is driven primarily by lower charges associated with account servicing activities.

Provision for Income Taxes

Income tax expense was $82.4 million in the current quarter, representing an effective tax rate of 32.6%, and $81.8 million in the prior year quarter, representing an effective tax rate of 34.5%. The decline in the effective tax rate for the current quarter reflects a higher portion of income being generated in jurisdictions with lower tax rates than the U.S.

55

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, 2011 and 2010. Business unit financial information, presented on an internal management-reporting basis, is determined by accounting systems that are used to allocate revenue and expenses 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 and Institutional Services						Personal Financial Services						Treasury and Other						Total Consolidated
($ In Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Noninterest Income
Trust, Investment and Other Servicing Fees	$	310.9		$	293.2		$	244.4		$	225.5		$	—		$	—		$	555.3		$	518.7
Other		125.0			114.9			30.7			33.3			3.7			(10.9	)		159.4			137.3
Net Interest Income (FTE)*		71.2			67.2			157.1			151.0			38.3			24.8			266.6			243.0
Revenues*		507.1			475.3			432.2			409.8			42.0			13.9			981.3			899.0
Provision for Credit Losses		(1.9	)		(2.8	)		19.4			32.8			—			—			17.5			30.0
Noninterest Expenses		375.8			330.6			300.6			274.6			24.8			16.9			701.2			622.1
Income before Income Taxes*		133.2			147.5			112.2			102.4			17.2			(3.0	)		262.6			246.9
Provision for Income Taxes*		50.3			51.9			44.5			39.0			(2.6	)		.4			92.2			91.3
Net Income	$	82.9		$	95.6		$	67.7		$	63.4		$	19.8		$	(3.4	)	$	170.4			155.6
Percentage of Consolidated Net Income		49	%		61	%		40	%		41	%		11	%		(2	)%		100	%		100	%
Average Assets	$	49,755.5		$	38,701.2		$	23,809.5		$	23,495.9		$	20,464.7		$	12,509.6		$	94,029.7		$	74,706.7

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $9.8 million for 2011 and $9.5 million for 2010.

Nine Months Ended September 30,	Corporate and Institutional Services						Personal Financial Services						Treasury and Other						Total Consolidated
($ In Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Noninterest Income
Trust, Investment and Other Servicing Fees	$	890.7		$	906.5		$	737.3		$	670.8		$	—		$	—		$	1,628.0		$	1,577.3
Other		373.8			384.9			94.9			100.0			(19.7	)		(7.3	)		449.0			477.6
Net Interest Income (FTE)*		199.1			207.9			456.6			439.3			112.4			78.3			768.1			725.5
Revenues*		1,463.6			1,499.3			1,288.8			1,210.1			92.7			71.0			2,845.1			2,780.4
Provision for Credit Losses		(18.8	)		(11.3	)		61.3			131.3			—			—			42.5			120.0
Noninterest Expenses		1,096.2			977.9			893.3			814.1			70.0			64.2			2,059.5			1,856.2
Income before Income Taxes*		386.2			532.7			334.2			264.7			22.7			6.8			743.1			804.2
Provision for Income Taxes*		147.4			187.7			132.7			100.5			(10.4	)		3.6			269.7			291.8
Net Income	$	238.8		$	345.0		$	201.5		$	164.2		$	33.1		$	3.2		$	473.4			512.4
Percentage of Consolidated Net Income		50	%		67	%		43	%		32	%		7	%		1	%		100	%		100	%
Average Assets	$	47,079.8		$	37,775.9		$	23,696.1		$	23,527.4		$	19,148.3		$	13,322.8		$	89,924.2		$	74,626.1

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $30.8 million for 2011 and $28.8 million for 2010.

56

Corporate and Institutional Services

C&IS net income for the quarter was $82.9 million compared with $95.6 million in the prior year quarter, a decrease of $12.7 million, or 13%.

C&IS Trust, Investment and Other Servicing Fees	Three Months Ended September 30,
($ In Millions)	2011		2010		Change
Custody and Fund Administration	$	205.6	$	159.2	$	46.4		29	%
Investment Management		64.6		60.7		3.9		6
Securities Lending		20.7		56.4		(35.7	)	(63	)
Other		20.0		16.9		3.1		18
Total	$	310.9	$	293.2	$	17.7		6	%

The increase in C&IS trust, investment and other servicing fees primarily reflects recent acquisitions, new business, and improved markets, partially offset by a decrease in securities lending revenue. Custody and fund administration fees, the largest component of C&IS fees, increased primarily reflecting recent acquisitions, new business, and improved markets. Investment management fees for the current quarter benefited from new business and improved markets, partially offset by waived fees in money market mutual funds due to the persistent low level of short-term interest rates. Money market mutual fund fee waivers in C&IS totaled $10.1 million in the current quarter compared with $2.5 million in the prior year quarter. Securities lending revenue in the prior year quarter included the recovery of previously recorded unrealized asset valuation losses of approximately $39 million in a mark-to-market investment fund used in securities lending activities. As of September 30, 2010, securities in the mark-to-market fund had been sold with the proceeds reinvested into a short duration fund, eliminating the mark-to-market impact on securities lending revenue in periods subsequent to the date of sale. Excluding the prior year quarter’s asset valuation recoveries, securities lending revenue increased approximately $3.3 million, attributable to higher spreads on the investment of cash collateral.

Other noninterest income increased $10.1 million, or 9%, in the current quarter as compared to the prior year quarter as a result of higher other operating income. The increase is other operating income was primarily attributable to the prior year quarter’s $6.2 million loss resulting from the discontinuance of certain cash flow hedges.

Net interest income stated on an FTE basis was up $4.0 million, or 6%, from the prior year quarter, primarily reflecting an increase in average earning assets. The net interest margin equaled .76% compared with .77% reported in the prior year quarter. Earning assets averaged $41.9 billion for the quarter, an increase of $7.4 billion, or 21%, compared with $34.5 billion the prior year quarter, funded chiefly by increased non-U.S. custody related interest-bearing deposits which are primarily invested in low yielding short-term interest-bearing deposits and securities.

A provision for credit losses of negative $1.9 million was recorded in the current quarter. The prior year quarter’s negative provision totaled $2.8 million. The current quarter negative provision reflects improvement in the commercial and institutional loan class.

57

Corporate and Institutional Services (continued)

Total C&IS noninterest expense, which includes the direct expense of the business unit, indirect expense allocations from Northern Trust Global Investments (NTGI) and Operations and Technology (O&T) for product and operating support, and indirect expense allocations for certain corporate support services, totaled $375.8 million compared with $330.6 million for the prior year quarter, an increase of $45.2 million, or 14%. The increase reflects higher compensation and outside service expenses and increased indirect expense allocations, including operating expenses associated with recent acquisitions, and restructuring, acquisition, and integration related charges.

Personal Financial Services

PFS net income for the current quarter was $67.7 million compared to $63.4 million reported in the prior year quarter, an increase of $4.3 million, or 7%. Noninterest income was $275.1 million, up $16.3 million, or 6%, from $258.8 million in the prior year quarter. Trust, investment and other servicing fees totaled $244.4 million in the current quarter, increasing $18.9 million, or 8%, from $225.5 million in the prior year quarter. The increase in PFS fees was primarily the result of strong new business and improved markets. PFS waived fees in money market mutual funds, attributable to the continued low level of short-term interest rates, totaled $19.0 million in the current quarter compared with $10.4 million in the prior year quarter. Other noninterest income totaled $30.7 million compared with $33.3 million in the prior year quarter.

Net interest income stated on an FTE basis was $157.1 million in the current quarter, an increase of 4% compared to $151.0 million in the prior year quarter. The net interest margin was 2.69% in the current quarter compared to 2.59% in the prior year quarter primarily reflecting a decline in the average cost of funds as a result of an increase in noninterest-bearing deposits.

A provision for credit losses of $19.4 million was recorded in the current quarter. The prior year quarter’s provision totaled $32.8 million. The current quarter provision reflects improvement in the commercial and institutional loan class, partially offset by continued weakness in the commercial real estate and residential real estate loan classes. For a fuller discussion of the consolidated allowance and provision for credit losses refer to the “Asset Quality” section below.

Total PFS noninterest expense, which includes the direct expense of the business unit, indirect expense allocations from NTGI and O&T for product and operating support, and indirect expense allocations for certain corporate support services, totaled $300.6 million compared with $274.6 million in the prior year quarter, an increase of $26.0 million, or 9%. The increase was primarily attributable to higher indirect expense allocations and increased compensation expense, including expenses associated with the current quarter’s restructuring related charges.

58

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 expense, executive level compensation, and nonrecurring items not allocated to the business units. Other noninterest income for the current quarter totaled $3.7 million, compared with negative $10.9 million in the prior year quarter. The current and prior year quarters included charges of $1.3 million and $14.0 million, respectively, for credit-related OTTI of residential mortgage backed securities. Net interest income in the current quarter was $38.3 million, as compared to $24.8 million in the prior year quarter, an increase of $13.5 million, or 54%. The increase reflects higher average asset levels as well as a change in the application of internal funds transfer pricing used in determining net interest income that was implemented in the first quarter of 2011, partially offset by lower yields on securities in the prolonged low interest rate environment. Average assets increased $8.0 billion, or 64%, to $20.5 billion in the current quarter, reflecting higher levels of Federal Reserve deposits and investment securities, funded primarily by non-U.S interest-bearing deposits, senior notes and allocated capital. Noninterest expense for the quarter totaled $24.8 million compared with $16.9 million in the prior year quarter, an increase of $7.9 million, or 47%, primarily attributable to higher outside services and compensation expense.

59

NINE-MONTH CONSOLIDATED RESULTS OF OPERATIONS

Net income per common share of $1.93 was reported for the nine months ended September 30, 2011, compared with net income per common share of $2.10 reported in the prior year nine-month period. The current period’s net income of $473.4 million compares to $512.4 million in the prior year period. Net income in the current period was impacted by restructuring, acquisition, and integration related charges totaling $30.6 million ($25.0 million after tax, or $.10 per common share). Return on average common equity for the period was 9.08% and the return on average assets was .70%.

The current and prior period’s results included Visa related benefits of $10.1 million ($6.4 million after tax, or $.03 per common share) and $12.7 million ($8.0 million after tax, or $.03 per common share), respectively. Operating earnings, which exclude the Visa related benefits, were $467.0 million, or $1.90 per common share, for the nine months ended September 30, 2011, and $504.4 million, or $2.07 per common share, for the nine-month period ended September 30, 2010. A reconciliation of operating earnings to reported earnings is provided on page 70.

Revenues for the nine months ended September 30, 2011 totaled $2.81 billion, up $62.7 million, or 2%, from the prior year period’s revenues of $2.75 billion. Trust, investment and other servicing fees were $1.63 billion for the period, $50.7 million, or 3%, higher as compared with $1.58 billion in the prior year period. Trust, investment and other servicing fees for the current period represented 58% of revenues, and total fee-related income represented 74% of total revenues.

Noninterest Income

The components of noninterest income are provided below.

Noninterest Income	Nine Months Ended September 30,
($ In Millions)	2011			2010			Change
Trust, Investment and Other Servicing Fees	$	1,628.0		$	1,577.3		$	50.7		3	%
Foreign Exchange Trading Income		252.8			284.0			(31.2	)	(11	)
Treasury Management Fees		55.1			59.3			(4.2	)	(7	)
Security Commissions and Trading Income		44.8			43.5			1.3		3
Other Operating Income		120.4			104.1			16.3		16
Investment Security Gains (Losses), net		(24.1	)		(13.3	)		(10.8	)	81
Total Noninterest Income	$	2,077.0		$	2,054.9		$	22.1		1	%

Trust, investment and other servicing fees from C&IS decreased $15.8 million, or 2%, to $890.7 million from $906.5 million a year ago, primarily reflecting a decline in securities lending revenue, partially offset by new business and improved markets.

60

Noninterest Income (continued)

C&IS Trust, Investment and Other Servicing Fees	Nine Months Ended September 30,
($ In Millions)	2011		2010		Change
Custody and Fund Administration	$	564.5	$	480.3	$	84.2		18	%
Investment Management		201.6		193.8		7.8		4
Securities Lending		68.6		178.3		(109.7	)	(62	)
Other		56.0		54.1		1.9		4
Total	$	890.7	$	906.5	$	(15.8	)	(2	)%

The increase in custody and fund administration fees, the largest component of C&IS fees, reflects new business, improved markets, and recent acquisitions. C&IS investment management fees benefitted from new business and improved markets, partially offset by waived fees in money market mutual funds due to the persistent low level of short-term interest rates. Money market mutual funds fee waivers in C&IS totaled $22.0 million in the current period compared with $9.3 million in the prior year period. Securities lending revenue in the prior year period included a recovery of previously recorded unrealized asset valuation losses of approximately $114 million in a mark-to-market investment fund used in securities lending activities. The securities in the mark-to-market investment fund had been sold as of September 30, 2010, with the proceeds reinvested into a short duration fund, eliminating the mark-to-market impact on securities lending fees in future periods. Excluding the prior period impact of asset valuation recoveries, securities lending fees in the current period increased by $4.3 million.

Trust, investment and other servicing fees from PFS increased $66.5 million, or 10%, to $737.3 million compared with $670.8 million in the year ago period. The increase in PFS fees resulted primarily from strong new business and improved markets. Waived fees in money market mutual funds totaled $46.4 million in the current period compared with $39.3 million in the prior year period, and are attributable to the persistent low level of short-term interest rates.

The $31.2 million, or 11%, decrease in foreign exchange trading income from the prior year period is attributable to lower market volatility for majority of the current nine-month period, partially offset by increased volumes.

Other Operating Income	Nine Months Ended September 30,
($ In Millions)	2011		2010			Change
Loan Service Fees	$	48.8	$	44.2		$	4.6		10	%
Banking Service Fees		41.9		42.9			(1.0	)	(2	)
Currency Translation Gains (Losses), net		7.5		(5.0	)		12.5		N/M
Credit Default Swaps Gains (Losses), net		.3		(.9	)		1.2		N/M
Other Income		21.9		22.9			(1.0	)	(4	)
Total Other Operating Income	$	120.4	$	104.1		$	16.3		16	%

The increase in other operating income is primarily attributable to currency translation gains recorded in the current period as compared to currency translation losses incurred in the prior year period, including a $6.3 million prior period loss resulting from the discontinuance of certain cash flow hedges.

61

Noninterest Income (continued)

Net investment security losses totaled $24.1 million in the current period compared to net losses of $13.3 in the prior year period. The current and prior year period included $23.3 million and $14.1 million, respectively, of pre-tax charges for the credit-related OTTI of residential mortgage backed securities held within Northern Trust’s balance sheet investment securities portfolio.

Net Interest Income

Net interest income, stated on an FTE basis, totaled $768.1 million, an increase of $42.6 million, or 6%, from $725.5 million reported in the prior year period. Total average earning assets of $81.2 billion were $14.4 billion, or 22%, higher than a year ago, primarily reflecting higher average Federal Reserve deposits, securities, and interest-bearing deposits with banks balances. The net interest margin on an FTE basis was 1.26% for the current period, down from 1.45% in the prior year period. The balance sheet grew primarily due to an increase in non-U.S. office interest-bearing deposits which were invested primarily in Federal Reserve deposits, lower yielding investment securities, and interest-bearing deposits with banks.

Provision for Credit Losses

The provision for credit losses was $42.5 million for the current nine month period compared with $120.0 million in the comparable 2010 period and net charge-offs totaled $65.2 million compared to $99.2 million. Nonperforming loans decreased $19.8 million as compared to the prior year period, reflecting improvement in commercial and institutional loans, partially offset by continued weakness in commercial real estate and residential real estate loans.

Noninterest Expense

Noninterest expense totaled $2.06 billion for the period, up $203.3 million, or 11%, from the prior year period’s $1.86 billion. The current and prior periods include benefits totaling $10.1 million and $12.7 million, respectively, from reductions of the Visa related indemnification liability. Excluding the current period operating expenses associated with recent acquisitions, and restructuring, acquisition, and integration related charges as well as the Visa related indemnification liability in both current and prior period, noninterest expense increased $123.8 million, or 7%.

The components of noninterest expense are provided below.

Noninterest Expense	Nine Months Ended September 30,
($ In Millions)	2011			2010			Change
Compensation	$	925.3		$	826.2		$	99.1		12	%
Employee Benefits		188.7			181.9			6.8		4
Outside Services		398.6			330.9			67.7		20
Equipment and Software		232.8			209.0			23.8		11
Occupancy		131.3			127.2			4.1		3
Visa Indemnification Benefit		(10.1	)		(12.7	)		2.6		(20	)
Other Operating Expense		192.9			193.7			(.8	)	—
Total Noninterest Expense	$	2,059.5		$	1,856.2		$	203.3		11	%

62

Noninterest Expense (continued)

Compensation expense, the largest component of noninterest expense, represented 45% of total noninterest expense and increased primarily due to higher full-time equivalent staff levels, higher performance based compensation, and annual salary increases.

The increase in expense associated with outside services is primarily due to higher expense associated with technical and investment manager sub-advisory services, including expense related to recent acquisitions.

Equipment and software expense increased due to increased amortization expense from continued investment in capital assets.

Other Operating Expense	Nine Months Ended September 30,
($ In Millions)	2011		2010		Change
Business Promotion	$	63.2	$	57.9	$	5.3		9	%
FDIC Insurance Premiums		22.5		27.0		(4.5	)	(17	)
Staff Related		26.6		24.9		1.7		7
Other Intangible Amortization		11.5		10.9		.6		6
Other Expenses		69.1		73.0		(3.9	)	(5	)
Total Other Operating Expense	$	192.9	$	193.7	$	(.8	)	N/M

Provision for Income Taxes

Total income tax expense was $238.9 million for the nine months ended September 30, 2011, representing an effective tax rate of 33.5%. This compares with $263.0 million of income tax expense and an effective tax rate of 33.9% in the prior year period. The effective tax rate for the current period reflects a higher portion of income being generated in jurisdictions with lower tax rates than the U.S., partially offset by higher state income tax provision as a result of an Illinois corporate income tax rate increase enacted in January 2011.

63

BALANCE SHEET

Total assets at September 30, 2011 were $96.1 billion and averaged $94.0 billion for the current quarter, compared with total assets of $80.7 billion at September 30, 2010 and average total assets of $74.7 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 on a short term basis by deposit and withdrawal activity involving large balances of short-term client funds. Loans and leases totaled $28.7 billion at September 30, 2011 and averaged $28.5 billion in the current quarter as compared to $27.9 billion at September 30, 2010 and a $27.4 billion average in the prior year quarter. Securities totaled $29.3 billion at September 30, 2011 and averaged $27.6 billion for the quarter, up 44% and 36%, respectively, compared with $20.7 billion at September 30, 2010 and $20.3 billion on average in the prior year quarter. Federal funds sold and securities purchased under agreements to resell, interest-bearing deposits with banks, and Federal Reserve deposits and other interest-bearing assets in aggregate totaled $25.7 billion at September 30, 2011 and averaged $28.3 billion in the current quarter, up 12% and 47%, respectively, from the year-ago quarter balances. The increase in average total assets was funded primarily by higher levels of non-U.S. office interest-bearing deposits and demand and other non-interest bearing balances.

Total stockholders’ equity averaged $7.1 billion, up $409.7 million, or 6%, from the prior year quarter’s average of $6.7 billion. The current quarter increase primarily reflects the retention of earnings, partially offset by the repurchase of common stock pursuant to the Corporation’s share buyback program and the payment of dividends. During the nine months ended September 30, 2011, the Corporation repurchased 1,567,795 shares at a cost of $78.1 million ($49.82 average price per share). An additional 5.6 million shares are authorized for repurchase after September 30, 2011 under the current share buyback program.

Northern Trust’s risk-based capital ratios remained strong at September 30, 2011 and were well above the minimum regulatory requirements established by U.S. banking regulators of 4% for tier 1 capital, 8% for total capital (risk-based), and 3% for leverage (tier 1 capital to period average assets). Each of the Corporation’s U.S. subsidiary banks had capital ratios at September 30, 2011 that were above the level required for classification as a “well capitalized” institution. Shown below are the September 30, 2011 and December 31, 2010 capital ratios of the Corporation and of each of its subsidiary banks whose net income for the three months ended September 30, 2011 or December 31, 2010 exceeded 10% of the consolidated total.

	September 30, 2011									December 31, 2010
	Tier 1 Capital			Total Capital			Leverage Ratio			Tier 1 Capital			Total Capital			Leverage Ratio
Northern Trust Corporation		12.2	%		13.9	%		7.5	%		13.6	%		15.6	%		8.8	%
The Northern Trust Company		11.3	%		13.6	%		6.4	%		13.3	%		16.2	%		8.0	%
Northern Trust, NA		12.5	%		13.9	%		9.7	%		12.4	%		13.9	%		10.8	%

64

BALANCE SHEET (continued)

The following table provides a reconciliation of the Corporation’s tier 1 common equity to tier 1 capital calculated in accordance with applicable regulatory requirements and GAAP.

($ In Millions)	September 30, 2011			December 31, 2010
Tier 1 Capital	$	7,030.0		$	6,977.0
Less – Floating Rate Capital Securities		268.6			268.5
Tier 1 Common Equity		6,761.4			6,708.5
Ratios
Tier 1 Capital		12.2	%		13.6	%
Tier 1 Common Equity		11.8	%		13.0	%

Northern Trust is providing the ratio of tier 1 common equity to risk-weighted assets in addition to its capital ratios prepared in accordance with regulatory requirements and GAAP as it is a measure that the Corporation and investors use to assess capital adequacy.

65

ASSET QUALITY

Securities Portfolio

Northern Trust maintains a high quality securities portfolio, with 83% of the combined available for sale, held to maturity, and trading account portfolios at September 30, 2011 composed of U.S. Treasury and government sponsored agency securities and triple-A rated asset-backed securities, auction rate securities and obligations of states and political subdivisions. The remaining 17% of the portfolio was composed of asset-backed securities, obligations of states and political subdivisions, auction rate securities and other securities, of which as a percentage of the total securities portfolio, 3% was rated double-A, 1% was rated below double-A, and 13% 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).

Total gross unrealized losses within the investment securities portfolio at September 30, 2011 were $74.0 million as compared to $99.5 million at December 31, 2010. Of the total gross unrealized losses on securities at September 30, 2011, $32.4 million relate to non-agency residential mortgage-backed securities. Non-agency residential mortgage-backed securities rated below double-A at September 30, 2011 represented 81% of the total fair value of non-agency residential mortgage-backed securities, were comprised primarily of sub-prime and Alt-A securities, and had a total amortized cost and fair value of $179.7 million and $149.2 million, respectively.

Northern Trust has evaluated non-agency residential mortgage-backed securities, and all other securities with unrealized losses, for possible OTTI in accordance with GAAP and Northern Trust’s security impairment review policy. Credit related losses recognized in earnings on debt securities other-than-temporarily impaired totaled $1.3 million and $23.3 million, respectively, for the three and nine months ended September 30, 2011. There was $14.0 million of credit-related losses recognized in earnings for the three months ended September 30, 2010 on debt securities other-than-temporarily impaired.

Northern Trust is a participant in the repurchase agreement market. This market provides 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 of securities purchased under agreements to resell. Securities sold under agreements to repurchase are held by the counterparty until the repurchase.

66

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, 2011			June 30, 2011			December 31, 2010			September 30, 2010
Nonperforming Loans and Leases
Commercial
Commercial and Institutional	$	35.5		$	55.7		$	58.0		$	57.8
Commercial Real Estate		84.0			106.5			116.4			113.8
Total Commercial		119.5			162.2			174.4			171.6
Personal
Residential Real Estate		181.9			163.0			153.3			145.4
Private Client		6.1			2.8			5.3			10.3
Total Personal		188.0			165.8			158.6			155.7
Total Nonperforming Loans and Leases		307.5			328.0			333.0			327.3
Other Real Estate Owned		30.4			31.1			45.5			50.3
Total Nonperforming Assets	$	337.9		$	359.1		$	378.5		$	377.6
90 Day Past Due Loans Still Accruing	$	12.4		$	21.7		$	13.0		$	9.1
Nonperforming Loans and Leases to Total Loans and Leases		1.07	%		1.15	%		1.18	%		1.17	%
Allowance for Credit Losses Assigned to Loans and Leases to Nonperforming Loans		1.0x			.9x			1.0x			1.0x

The duration and severity of the recent economic downturn, together with its impact on equity and real estate values, had a negative effect on Northern Trust’s credit portfolio, primarily the residential real estate and commercial real estate loan classes, and resulted in increases from historical levels of credits downgraded to nonperforming and of OREO properties. The $21.2 million decrease in nonperforming assets during the current quarter primarily reflects nonperforming loan payoffs and sales as well as amounts charged off, partially offset by additional loans classified as nonperforming.

Maintaining a low level of nonperforming assets is important to the ongoing success of a financial institution. In addition to the negative impact on both net interest income and credit losses, nonperforming assets also increase operating costs due to the expense associated with collection efforts. 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 conventional home mortgages and equity credit lines, which generally require a loan to collateral value 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

67

ASSET QUALITY (continued)

independent third parties. The commercial real estate portfolio consists of commercial mortgages and construction, acquisition and development loans extended primarily to highly experienced developers and/or 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.

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.

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 probable losses that are believed to be inherent in the loan and lease portfolios, unfunded 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.

A $17.5 million provision for credit losses was recorded in the current quarter and a $30.0 million provision was recorded in the prior year third quarter. The current quarter provision reflects improvement in the commercial and institutional loan class, partially offset by continued weakness in the commercial real estate and residential real estate loan classes. The prior year quarter provision reflected the prolonged weakness in the broader economic environment, particularly on the residential and commercial real estate loan classes.

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, 2011 and 2010 due to charge-offs, recoveries, and the provision for credit losses. The following table shows the specific portion of the allowance and the inherent portion of the allowance and its components, each by loan and lease segment and class.

68

ASSET QUALITY (continued)

	September 30, 2011						June 30, 2011						December 31, 2010						September 30, 2010
($ In Millions)	Allowance Amount			Percent of Loans to Total			Allowance Amount			Percent of Loans to Total			Allowance Amount			Percent of Loans to Total			Allowance Amount			Percent of Loans to Total
Specific Allowance	$	49.3			—	%	$	61.3			—	%		63.7			—	%	$	58.1			—	%
Allocated Inherent Allowance
Commercial
Commercial and Institutional		93.7			22			97.2			22			113.6			21			124.0			22
Commercial Real Estate		77.7			10			79.1			11			76.7			11			74.6			11
Lease Financing, net		1.3			4			1.8			4			1.3			4			1.1			4
Non-U.S.		4.7			5			4.2			6			3.8			4			4.3			3
Other		—			2			—			1			—			1			—			3
Total Commercial		177.4			43			182.3			44			195.4			41			204.0			43
Personal
Residential Real Estate		92.6			37			88.0			37			81.6			39			81.2			39
Private Client		15.3			19			14.2			18			16.6			19			18.1			18
Other		—			1			—			1			—			1			—			—
Total Personal		107.9			57			102.2			56			98.2			59			99.3			57
Total Allocated Inherent Allowance	$	285.3			100	%	$	284.5			100	%		293.6			100	%	$	303.3			100	%
Total Allowance for Credit Losses		334.6						345.8						357.3						361.4
Allowance Assigned to:
Loans and Leases	$	298.3					$	311.3						319.6					$	324.7
Unfunded Commitments and Standby Letters of Credit		36.3						34.5						37.7						36.7
Total Allowance for Credit Losses	$	334.6					$	345.8						357.3					$	361.4
Allowance Assigned to Loans and Leases to Total Loans and Leases		1.04	%					1.09	%					1.14	%					1.17	%

MARKET RISK MANAGEMENT

As described in the 2010 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 VaR associated with the foreign exchange trading portfolio has not changed significantly since December 31, 2010. Northern Trust’s interest rate risk position relative to rising rates, as measured by current market implied forward interest rates and sensitivity analyses, has increased as a result of a moderate extension of the securities portfolio duration and a projected increase in the sensitivity of non-US office deposit rates.

69

RECONCILIATIONS OF OPERATING EARNINGS TO REPORTED EARNINGS

The following table provides a reconciliation of operating earnings, a non-GAAP financial measure which excludes Visa related indemnification benefits, to reported earnings prepared in accordance with GAAP. Management believes the presentation of operating earnings in addition to reported results prepared in accordance with GAAP provides a clearer indication of the results and trends in Northern Trust’s core businesses. There were no Visa related adjustments in the three months ended September 30, 2011 or 2010.

	Nine Months Ended
	September 30, 2011						September 30, 2010
($ In Millions Except Per Common Share Data)	Amount			Per Common Share			Amount			Per Common Share
Reported Earnings	$	473.4		$	1.93		$	512.4		$	2.10
Visa Indemnification Benefit		(10.1	)		(.04	)		(12.7	)		(.05	)
Tax effect		3.7			.01			4.7			.02
Visa Indemnification Benefit-Net of tax		(6.4	)		(.03	)		(8.0	)		(.03	)
Operating Earnings	$	467.0		$	1.90		$	504.4		$	2.07

RECONCILIATION OF REPORTED NET INTEREST INCOME TO FULLY TAXABLE EQUIVALENT

The table below presents 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 this presentation provides a clearer indication of net interest margins for comparative purposes.

	Three Months Ended
	September 30, 2011								September 30, 2010
($ In Millions)	Reported			FTE Adj.		FTE*			Reported			FTE Adj.		FTE*
Interest Income	$	347.1		$	9.8	$	356.9		$	330.2		$	9.5	$	339.7
Interest Expense		90.3			—		90.3			96.7			—		96.7
Net Interest Income	$	256.8		$	9.8	$	266.6		$	233.5		$	9.5	$	243.0
Net Interest Margin		1.21	%				1.25	%		1.38	%				1.44	%

* Fully taxable equivalent (FTE).

	Nine Months Ended
	September 30, 2011								September 30, 2010
($ In Millions)	Reported			FTE Adj.		FTE*			Reported			FTE Adj.		FTE*
Interest Income	$	1,053.8		$	30.8	$	1,084.6		$	962.4		$	28.8	$	991.2
Interest Expense		316.5			—		316.5			265.7			—		265.7
Net Interest Income	$	737.3		$	30.8	$	768.1		$	696.7		$	28.8	$	725.5
Net Interest Margin		1.21	%				1.26	%		1.39	%				1.45	%

* Fully taxable equivalent (FTE).

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FACTORS AFFECTING FUTURE RESULTS

This report contains statements that may be considered forward-looking, such as the statements relating to Northern Trust’s financial goals, capital adequacy, dividend policy, expansion and business development plans, risk management policies, anticipated expense levels and projected profit improvements, business prospects and positioning with respect to market, demographic and pricing trends, strategic initiatives, re-engineering and outsourcing activities, new business results and outlook, changes in securities market prices, credit quality including allowance levels, planned capital expenditures and technology spending, anticipated tax benefits and expenses, and the effects of any extraordinary events and various other matters (including developments with respect to litigation, other contingent liabilities and obligations, and regulation involving Northern Trust and changes in accounting policies, standards and interpretations) on Northern Trust’s business and results.

Forward-looking statements are typically identified by words or phrases such as “believe”, “expect”, “anticipate”, “intend”, “estimate”, “may increase”, “may fluctuate”, “plan”, “goal”, “target”, “strategy”, and similar expressions or future or conditional verbs such as “may”, “will”, “should”, “would”, and “could.” Forward-looking statements are Northern Trust’s current estimates or expectations of future events or future results. 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 and 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 the recent disruption and 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; changes in foreign exchange trading client volumes, fluctuations and volatility in foreign currency exchange rates, and Northern Trust’s success in assessing and mitigating the risks arising from such changes, fluctuations and volatility; 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 portfolio; Northern Trust’s success in managing various risks inherent in its business, including credit risk, operational risk, interest rate risk and liquidity risk, particularly during times of economic uncertainty and volatility in the credit and other markets; 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

71

FACTORS AFFECTING FUTURE RESULTS (continued)

continued globalization of investment activity and growth in worldwide financial assets; regulatory and monetary policy developments; failure to obtain regulatory approvals when required; changes in tax laws, accounting requirements or interpretations and other legislation in the U.S. or other countries that could affect Northern Trust or its clients, including changes in accounting rules for fair value measurements and recognizing impairments; changes in the nature and activities of Northern Trust’s competition, including increased consolidation within the financial services industry; Northern Trust’s success in maintaining existing business and continuing to generate new business in its existing markets; Northern Trust’s success in identifying and penetrating targeted markets, through acquisition, strategic alliance or otherwise; Northern Trust’s success in integrating acquisitions and strategic alliances; Northern Trust’s success in addressing the complex needs of a global client base across multiple time zones and from multiple locations, and managing compliance with legal, tax, regulatory and other requirements in areas of faster growth in its businesses, especially in immature markets; Northern Trust’s ability to maintain a product mix that achieves acceptable margins; Northern Trust’s ability to continue to generate investment results that satisfy its clients and continue to develop its array of investment products; Northern Trust’s success in generating revenues in its securities lending business for itself and its clients, especially in periods of economic and financial market uncertainty; Northern Trust’s success in recruiting and retaining the necessary personnel to support business growth and expansion and maintain sufficient expertise to support increasingly complex products and services; Northern Trust’s ability, as products, methods of delivery, and client requirements change or become more complex, to continue to fund and accomplish innovation, 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; Northern Trust’s success in controlling expenses, particularly in a difficult economic environment; 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 and the current regulatory environment, including the requirements of the Basel II capital regime and the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”), areas of increased regulatory emphasis and oversight in the U.S. and other countries such as anti-money laundering, anti-bribery, and client privacy and the potential for substantial changes in the legal, regulatory and enforcement framework and oversight applicable to financial institutions in reaction to recent adverse financial market events, including changes pursuant to the Dodd-Frank Act that may, among other things, affect the leverage limits and risk-based capital and liquidity requirements for certain financial institutions, including Northern Trust, require those financial institutions to pay higher assessments, expose them 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 that evolving regulations, such as Basel II, and potential legislation and regulations, including Basel III and regulations that may be 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; risks and uncertainties

72

FACTORS AFFECTING FUTURE RESULTS (continued)

inherent in the litigation and regulatory process, including the adequacy of contingent liability, tax, and other accruals; and the risk of events that could harm Northern Trust’s reputation and so undermine the confidence of clients, counterparties, rating agencies, and stockholders.

Some of these and other risks and uncertainties that may affect future results are discussed in more detail in the section of “Management’s Discussion and Analysis of Financial Condition and Results of Operations” captioned “Risk Management” in the 2010 Annual Report to Shareholders (pages 51-63), in the section of the “Notes to Consolidated Financial Statements” in the 2010 Annual Report to Shareholders captioned “Note 24 – Contingent Liabilities” (pages 104 and 105), in the sections of “Item 1 – Business” of the 2010 Annual Report on Form 10-K captioned “Government Monetary and Fiscal Policies,” “Competition” and “Regulation and Supervision” (pages 2-13), and in “Item 1A – Risk Factors” of the 2010 Annual Report on Form 10-K (pages 27-36). All forward-looking statements included in this report are based upon information presently available, and Northern Trust assumes no obligation to update any forward-looking statements.

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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	Third Quarter
EQUIVALENT BASIS)	2011								2010
($ 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	$	273.4			.07	%	$	.2	$	309.6			.21	%
Interest-Bearing Deposits with Banks		49.3		17,234.8			1.13			40.2		14,386.1			1.11
Federal Reserve Deposits and Other Interest-Bearing		7.1		10,808.5			.26			2.9		4,536.1			.25
Securities
U.S. Government		6.3		1,747.7			1.44			—		154.0			—
Obligations of States and Political Subdivisions		9.9		588.8			6.70			11.8		718.6			6.57
Government Sponsored Agency		26.5		14,910.6			.71			28.9		11,900.0			.96
Other(1)		26.7		10,395.5			1.02			22.6		7,574.1			1.18
Total Securities		69.4		27,642.6			1.00			63.3		20,346.7			1.24
Loans and Leases(2)		231.0		28,469.1			3.22			233.1		27,376.2			3.38
Total Earning Assets		356.9		84,428.4			1.68	%		339.7		66,954.7			2.01
Allowance for Credit Losses Assigned to Loans and Leases		—		(300.9	)		—			—		(320.6	)		—
Cash and Due from Banks		—		4,127.5			—			—		2,708.2			—
Buildings and Equipment		—		498.6			—			—		532.3			—
Client Security Settlement Receivables		—		406.7			—			—		355.6			—
Goodwill		—		504.7			—			—		397.8			—
Other Assets		—		4,364.7			—			—		4,078.7			—
Total Assets	$	—	$	94,029.7			—		$	—	$	74,706.7			—
Average Source of Funds
Deposits
Savings and Money Market	$	5.5	$	14,137.3			.16	%	$	8.9	$	13,004.8			.27	%
Savings Certificates and Other Time		6.7		3,625.3			.74			9.6		3,573.1			1.06
Non-U.S. Offices - Interest-Bearing		37.9		41,688.4			.36			35.2		30,116.5			.46
Total Interest-Bearing Deposits		50.1		59,451.0			.33			53.7		46,694.4			.46
Short-Term Borrowings		1.7		3,003.8			.22			2.6		5,222.3			.20
Senior Notes		16.3		2,015.3			3.21			11.5		1,403.6			3.25
Long-Term Debt		21.6		2,179.8			3.92			28.1		2,792.7			4.00
Floating Rate Capital Debt		.6		276.9			.83			.8		276.8			1.07
Total Interest-Related Funds	$	90.3	$	66,926.8			.54	%	$	96.7	$	56,389.8			.68	%
Interest Rate Spread		—		—			1.14			—		—			1.33	%
Demand and Other Noninterest-Bearing Deposits		—		16,851.3			—			—		8,137.3			—
Other Liabilities		—		3,157.1			—			—		3,494.8			—
Stockholders' Equity		—		7,094.5			—			—		6,684.8			—
Total Liabilities and Stockholders’ Equity	$	—	$	94,029.7			—		$	—	$	74,706.7			—
Net Interest Income/Margin (FTE Adjusted)	$	266.6	$	—			1.25	%	$	243.0	$	—			1.44	%
Net Interest Income/Margin (Unadjusted)	$	256.8	$	—			1.21	%	$	233.5	$	—			1.38	%

ANALYSIS OF NET INTEREST INCOME CHANGES

DUE TO VOLUME AND RATE

	Three Months 2011/2010
	Change Due To
(In Millions)	Average Balance		Rate			Total
Earning Assets (FTE)	$	52.6	$	(35.4	)	$	17.2
Interest-Related Funds		12.4		(18.8	)		(6.4	)
Net Interest Income (FTE)	$	40.2	$	(16.6	)	$	23.6

(1) Other securities include Federal Reserve and Federal Home Loan Bank stock and certain affordable housing investments which are classified in other assets on the consolidated balance sheet as of September 30, 2011 and 2010.

(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 37.2%. Total taxable equivalent interest adjustments amounted to $9.8 million and $9.5 million for the three months ended September 30, 2011 and 2010, 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.

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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	Nine Months
EQUIVALENT BASIS)	2011								2010
($ 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	$	265.8			.09	%	$	.4	$	293.7			.18	%
Interest-Bearing Deposits with Banks		131.4		16,543.7			1.06			100.8		14,646.3			.92
Federal Reserve Deposits and Other Interest-Bearing		23.1		11,526.2			.27			9.7		5,050.6			.26
Securities
U.S. Government		15.4		1,243.7			1.65			.1		101.3			.11
Obligations of States and Political Subdivisions		31.0		621.9			6.65			35.6		733.7			6.47
Government Sponsored Agency		73.5		13,448.4			.73			91.3		11,724.8			1.04
Other (1)		86.8		9,376.6			1.24			62.6		6,797.7			1.23
Total Securities		206.7		24,690.6			1.12			189.6		19,357.5			1.31
Loans and Leases (2)		723.2		28,200.8			3.43			690.7		27,480.6			3.36
Total Earning Assets	$	1,084.6		81,227.1			1.79	%	$	991.2	$	66,828.7			1.98	%
Allowance for Credit Losses Assigned to Loans and Leases		—		(309.4	)		—			—		(312.4	)		—
Cash and Due from Banks		—		3,809.5			—			—		2,698.0			—
Buildings and Equipment		—		500.9			—			—		534.4			—
Client Security Settlement Receivables		—		415.1			—			—		391.7			—
Goodwill		—		442.8			—			—		395.7			—
Other Assets		—		3,838.2			—			—		4,090.0			—
Total Assets		—	$	89,924.2			—		$	—	$	74,626.1			—
Average Source of Funds
Deposits
Savings and Money Market	$	20.9	$	14,088.2			.20	%	$	27.1	$	12,952.2			.28	%
Savings Certificates and Other Time		22.1		3,713.7			.80			31.3		3,657.1			1.14
Non-U.S. Offices - Interest-Bearing		144.0		39,797.9			.48			76.7		28,865.5			.36
Total Interest-Bearing Deposits		187.0		57,599.8			.43			135.1		45,474.8			.40
Short-Term Borrowings		6.7		5,075.0			.18			8.6		6,055.8			.19
Senior Notes		47.7		1,933.9			3.30			34.4		1,439.1			3.16
Long-Term Debt		73.3		2,551.4			3.85			85.8		2,845.5			4.03
Floating Rate Capital Debt		1.8		276.9			.85			1.8		276.8			.86
Total Interest-Related Funds	$	316.5	$	67,437.0			.63	%	$	265.7	$	56,092.0			.63	%
Interest Rate Spread		—		—			1.16			—		—			1.35	%
Demand and Other Noninterest-Bearing Deposits		—		12,565.2			—			—		8,855.3			—
Other Liabilities		—		2,953.1			—			—		3,116.0			—
Stockholders' Equity		—		6,968.9			—			—		6,562.8			—
Total Liabilities and Stockholders' Equity	$	—	$	89,924.2			—		$	—	$	74,626.1			—
Net Interest Income/Margin (FTE Adjusted)	$	768.1	$	—			1.26	%	$	725.5	$	—			1.45	%
Net Interest Income/Margin (Unadjusted)	$	737.3	$	—			1.21	%	$	696.7	$	—			1.39	%

ANALYSIS OF NET INTEREST INCOME CHANGES

DUE TO VOLUME AND RATE

	Nine Months 2011/2010 Change Due To
(In Millions)	Average Balance		Rate			Total
Earning Assets (FTE)	$	116.6	$	(23.2	)	$	93.4
Interest-Related Funds		37.5		13.3			50.8
Net Interest Income (FTE)	$	79.1	$	(36.5	)	$	42.6

(1) Other securities include Federal Reserve and Federal Home Loan Bank stock and certain affordable housing investments which are classified in other assets on the consolidated balance sheet as of September 30, 2011 and 2010.

(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 37.2%. Total taxable equivalent interest adjustments amounted to $30.8 million and $28.8 million for the nine months ended September 30, 2011 and 2010, 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.

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Item 3. Quantitative and Qualitative Disclosures about Market Risk

The information called for by this item is incorporated herein by reference to the “Management’s Discussion and Analysis of Financial Condition and Results of Operations-Market Risk Management” section within this Form 10-Q.

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 the end of the period covered by this report. Based on such evaluation, such officers have concluded that, as of the end of the period covered by this report, the Corporation’s disclosure controls and procedures are effective in bringing to their attention on a timely basis material information relating to the Corporation (including its consolidated subsidiaries) required to be included in the Corporation’s periodic filings under the Exchange Act.

There have been no changes in the Corporation’s internal control over financial reporting during the last fiscal quarter that have materially affected, or that are reasonably likely to materially affect, the Corporation’s internal control over financial reporting.

PART II - OTHER INFORMATION

Item 1. Legal Proceedings

The information presented in Note 18 titled “Contingent Liabilities” within this Form 10-Q is incorporated herein by reference.

Item 1A. Risk Factors

There are no material changes to the risk factors set forth in Part I, Item 1A in the Corporation’s Annual Report on Form 10-K for the year ended December 31, 2010.

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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, 2011:

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 of Shares that May Yet be Purchased Under the Plan
July 1-31, 2011		29,873	$	45.35		29,873
August 1-31, 2011		2,928		44.90		2,928
September 1-30, 2011		8		38.38		8
Total (Third Quarter)		32,809	$	45.31		32,809		5,611,486

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

(2) The Corporation’s current stock buyback program, announced October 17, 2006, authorizes the purchase of up to 12.0 million shares of the Corporation’s common stock. The Corporation’s current stock buyback program has no fixed expiration date.

Item 6. Exhibits

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

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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 28, 2011	By:	/s/ Michael G. O’Grady
		Michael G. O’Grady
		Executive Vice President and Chief Financial Officer
Date: October 28, 2011	By:	/s/ Aileen B. Blake
		Aileen B. Blake
		Executive Vice President and Controller (Chief Accounting Officer)

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EXHIBIT INDEX

The following exhibits have been filed with the Securities and Exchange Commission with Northern Trust Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2011. You may obtain copies of these exhibits from the SEC’s Internet site at http://www.sec.gov. Stockholders may also obtain copies of such exhibits by writing Rose A. Ellis, Secretary, Northern Trust Corporation, 50 South LaSalle Street, Chicago, Illinois 60603.

Exhibit Number	Description
(4)	Instruments Defining Rights of Security Holders:
	(i)     Form of The Northern Trust Company’s Global Senior Bank Note (Fixed Rate) (supercedes Exhibit 4(ii) filed with the Quarterly Report on Form 10-Q for the quarter ended September 30, 2001).
	(ii)    Form of The Northern Trust Company’s Global Senior Bank Note (Floating Rate) (supercedes Exhibit 4(ii) filed with the Annual Report on Form 10-K for the year ended December 31, 2002).
	(iii)  Form of The Northern Trust Company’s Global Subordinated Bank Note (Fixed Rate) (supercedes Exhibit 4(iv) filed with the Quarterly Report on Form 10-Q for the quarter ended September 30, 2001).
	(iv)   Form of The Northern Trust Company’s Global Subordinated Bank Note (Floating Rate) (supercedes Exhibit 4(iv) filed with the Annual Report on Form 10-K for the year ended December 31, 2002).
	(v)    Form of 3.375% Note due 2021 (incorporated by reference to Form 8-K dated August 17, 2011).
(10)	Material Contracts
	(i)     Amendment Number One dated September 12, 2011 and effective as of July 29, 2011 to The Northern Trust Company Thrift-Incentive Plan (as amended and restated effective as of January 1, 2010).
	(ii)    Amendment Number Two dated September 21, 2011 and effective as of September 30, 2011 to The Northern Trust Company Thrift-Incentive Plan (as amended and restated effective as of January 1, 2010).
(31)	Rule 13a-14(a)/15d-14(a) Certifications
	(i)     Certification of CEO Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
	(ii)    Certification of CFO Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

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EXHIBIT INDEX (continued)

Exhibit Number	Description
(32)	Section 1350 Certifications
	(i)     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)	Interactive Data File
	(i)     Includes the following financial and related information from Northern Trust’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2011 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.

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EX-4.(I)

Exhibit (4)(i)

AMENDMENT NUMBER ONE TO

THE NORTHERN TRUST COMPANY THRIFT-INCENTIVE PLAN

(As Amended and Restated Effective as of January 1, 2010)

WHEREAS, The Northern Trust Company (the “Company”) maintains The Northern Trust Company Thrift-Incentive Plan, As Amended and Restated Effective as of January 1, 2010, (the “Plan”); and

WHEREAS, amendment of the Plan is now considered desirable;

NOW, THEREFORE, by virtue and in exercise of the amending power reserved to the undersigned officer under Section 11.1 of the Plan, the Plan is hereby amended effective as of July 29, 2011, as follows:

1. The following shall be added as Supplement #16 to the Plan:

“Supplement #16

Special Rules for Former Employees of Omnium LLC

This Supplement #16 to The Northern Trust Company Thrift-Incentive Plan, As Amended and Restated Effective as of January 1, 2010 (the “Plan”), is made a part of the Plan and supersedes any provisions thereof to the extent that they are not consistent with the Supplement. Unless the context clearly implies or indicates to the contrary, a word, term or phrase used or defined in the Plan is similarly used or defined for purposes of this Supplement #16.

1. Application. This Supplement supplements and modifies the provisions of the Plan in connection with the employment by Northern Trust Hedge Fund Services LLC (“NTHFS”) (or the Company or another Participating Employer) of the former employees of Omnium LLC (“Omnium”) who are listed on Schedule 5.06(a) of a Purchase Agreement dated as of May 15, 2011 among Omnium Holdings LLC, Omnium, Citadel LLC, Citadel Limited Partnership, Northern Trust Corporation and the Company (the “Agreement”), pursuant to which the Company purchased all of the issued and outstanding equity interests of Omnium.

2. Effective Date. The effective date of this Supplement #16 is July 29, 2011.

3. Omnium Member. The term “Omnium Member” means any employee of Omnium who is listed on Schedule 5.06(a) of the Agreement and who became an employee of NTHFS (or the Company or another Participating Employer) on the Closing Date, pursuant to Section 5.06(a) of the Agreement.

4. Participation and Vesting Service. Anything in the Plan to the contrary notwithstanding, for purposes of determining (a) eligibility to become a Participant in the Plan pursuant to section 3.1 of the Plan, (b) eligibility to

receive a Matching Contribution with respect to the Omnium Member’s Matchable Participant Deposits pursuant to section 5.1 of the Plan, and (c) the Vested Portion of an Omnium Member’s Matching Contribution Account pursuant to section 2.1 (mmm) of the Plan, an Omnium Member’s Vesting Service shall be calculated as if his or her employment with Omnium had been employment with the Company or a Participating Employer.”

2. The following shall be added at the end of Schedule A of the Plan:

“Affiliate Name and Acq/Div. Code	TIP Earliest Vesting Date
Omnium Agreement dated 5/15/11.                 OM Applicable to Omnium Members as defined in Supplement #16.	Service Date with Omnium for participation and vesting.”

IN WITNESS WHEREOF, the Company has caused this amendment to be executed on its behalf this 12th of September, 2011 effective as of July 29, 2011.

THE NORTHERN TRUST COMPANY
By:	/s/ Timothy P. Moen
Name:	Timothy P. Moen
Title:	Executive Vice President and
	Human Resources Department Head

- 2 -

EX-4.(II)

Exhibit (4)(ii)

AMENDMENT NUMBER TWO TO

THE NORTHERN TRUST COMPANY THRIFT-INCENTIVE PLAN

(As Amended and Restated Effective as of January 1, 2010)

WHEREAS, The Northern Trust Company (the “Company”) maintains The Northern Trust Company Thrift-Incentive Plan, As Amended and Restated Effective as of January 1, 2010, (the “Plan”); and

WHEREAS, amendment of the Plan is now considered desirable;

NOW, THEREFORE, by virtue and in exercise of the amending power reserved to the undersigned officer under Section 11.1 of the Plan, the Plan is hereby amended effective as of September 30, 2011, to add the following as a new sentence immediately prior to the last sentence of section 8.3 of the Plan:

“For Forfeitures that are processed after September 30, 2011, the Unvested Portion of the Member’s Matching Contribution Account, Profit Sharing Account, Former ESOP Account and Acquired Company Prior Plan Account which is forfeited shall result in a pro rata reduction in the Investment Funds in which such Accounts are invested.”

IN WITNESS WHEREOF, the Company has caused this amendment to be executed on its behalf this 21^st of September, 2011 effective as of September 30, 2011.

THE NORTHERN TRUST COMPANY
By:	/s/ Timothy P. Moen
Name:	Timothy P. Moen
Title:	Executive Vice President and
	Human Resources Department Head

EX-4.(III)

Exhibit (4)(iii)

Rev. 08/11

UNLESS THIS SENIOR NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE BANK OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY SENIOR NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

IF THIS SENIOR NOTE IS ISSUED WITH “ORIGINAL ISSUE DISCOUNT” FOR PURPOSES OF SECTION 1273 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED, THE FOLLOWING SHALL BE COMPLETED: THE FOLLOWING INFORMATION IS PROVIDED SOLELY FOR PURPOSES OF APPLYING SECTIONS 1272, 1273 AND 1275 OF THE UNITED STATES INTERNAL REVENUE CODE OF 1986, AS AMENDED, TO THIS SENIOR NOTE. THE ISSUE DATE OF THIS SENIOR NOTE IS             . THE ISSUE PRICE OF THIS SENIOR NOTE IS             % OF ITS PRINCIPAL AMOUNT. THE AMOUNT OF ORIGINAL ISSUE DISCOUNT ON THIS SENIOR NOTE IS $            PER $1,000 OF THE INITIAL PRINCIPAL AMOUNT, THE YIELD TO MATURITY IS             %, AND THE AMOUNT OF THE ORIGINAL ISSUE DISCOUNT ALLOCABLE TO THE INITIAL SHORT ACCRUAL PERIOD, IF ANY, IS $            PER $1,000 OF THE INITIAL PRINCIPAL AMOUNT, DETERMINED ON THE BASIS OF THE EXACT METHOD.

NO. SEN FXR-	REGISTERED
CUSIP NO.:

THE NORTHERN TRUST COMPANY

GLOBAL SENIOR BANK NOTE

(Fixed Rate)

ORIGINAL ISSUE DATE:                       INTEREST RATE:                     INTEREST PAYMENT:                     % DATES:                       INITIAL REDEMPTION DATE: PRINCIPAL AMOUNT:                       MATURITY DATE:                     REGULAR RECORD DATES (If other than the
April 1 or October 1, prior to each Interest Payment
Date):                       INITIAL REDEMPTION PERCENTAGE:                    

ANNUAL REDEMPTION PERCENTAGE REDUCTION:	HOLDER’S OPTIONAL REPAYMENT DATE(S):
ORIGINAL ISSUE DISCOUNT NOTE:         Yes:            No:             OTHER PROVISIONS:	OLD AMOUNT:                      DEFAULT RATE:            %

The Northern Trust Company, an Illinois banking corporation (the “Bank”), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal amount specified on the face hereof in United States Dollars on the Maturity Date specified above and to pay interest thereon from the Original Issue Date specified above or from the most recent interest payment date to which interest on this. Senior Note (or any predecessor Senior Note) has been paid or duly provided for, semi-annually on April 15 and October 15 of-each year (unless otherwise specified on the face hereof) (each, an “Interest Payment Date”) and at maturity or upon earlier redemption or repayment, if applicable, commencing on the first Interest Payment Date next succeeding the Original Issue Date (or, if the Original Issue Date is between a Regular Record Date and the Interest Payment Date immediately following such Regular Record Date, on the second Interest Payment Date following the Original Issue Date), at the Interest Rate per annum specified above, until the principal hereof is paid or made available for payment, and (to the extent that the payment of such interest shall be legally enforceable) at such Interest Rate (or the Default Rate per annum specified above) on any overdue principal and premium, if any, and on any overdue installment of interest. Notwithstanding the foregoing, if this Senior Note has a maturity of one year or less, interest will be paid only at maturity. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will be paid to the person in whose name this Senior Note (or any predecessor Senior Note) is registered at the close of business on the Regular Record Date for such interest, which shall be the April 1 and October 1 (whether or not a Business Day (as defined below)), as the case may be, next preceding the applicable Interest Payment Date (unless otherwise specified on the face hereof); provided, however, that interest payable at maturity or upon earlier redemption or repayment, if applicable, will be payable to the person to whom principal shall be payable.

Payment of principal of, and premium, if any, and interest on, this Senior Note will be made in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts. The Bank will at all times appoint and maintain a paying agent (the “Paying Agent”) authorized by the Bank to pay the principal of, and premium, if any, and interest on, this Senior Note on behalf of the Bank and having an office or agency (the “Paying Agent Office”) in The City of New York or the City of Chicago, Illinois (the “Place of Payment”), where this Senior Note may be presented or surrendered for payment and where notices, designations or requests in respect of payments with respect to this Senior Note may be served. The Bank has initially appointed itself as the Paying Agent, with the Paying Agent Office currently located at 50 South LaSalle Street (Level BB-A), Chicago, Illinois 60675, Attention: Securities Services.

THIS SENIOR NOTE IS A DIRECT, UNCONDITIONAL, UNSECURED AND UNSUBORDINATED GENERAL OBLIGATION OF THE BANK. THIS SENIOR NOTE IS NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION, IS NOT A DEPOSIT OF, OR GUARANTEED BY, THE BANK, AND IS SUBJECT TO INVESTMENT RISKS, INCLUDING POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED. THIS SENIOR NOTE RANKS PARI PASSU WITH ALL OTHER UNSECURED AND UNSUBORDINATED OBLIGATIONS OF THE BANK, EXCEPT DEPOSITS AND OTHER OBLIGATIONS THAT ARE SUBJECT TO A PRIORITY OR PREFERENCE. UNDER APPLICABLE LAW, CLAIMS OF CERTAIN CREDITORS, INCLUDING HOLDERS OF DEPOSITS IN THE BANK, WOULD BE ENTITLED TO PRIORITY OVER CLAIMS OF UNSECURED GENERAL CREDITORS OF THE BANK, INCLUDING THE HOLDER OF THIS SENIOR NOTE, IN THE EVENT OF A LIQUIDATION OR OTHER RESOLUTION OF THE BANK.

Payment of the principal of, and premium, if any, and interest on, this Senior Note due at maturity or upon earlier redemption or repayment, if applicable, will be made in immediately available funds upon presentation and surrender of this Senior Note to the Paying Agent at the Paying Agent Office in the Place of Payment; provided that this Senior Note is presented to the Paying Agent in time for the Paying Agent to make such payment in accordance with its normal procedures. Payments of interest on this Senior Note (other than at maturity or upon earlier redemption or repayment) will be made by wire transfer to such account as has been appropriately designated to the Paying Agent by the person entitled to such payments.

This Senior Note is one of a duly authorized issue of Senior Bank Notes due from 30 days to fifteen years from date of issue of the Bank (herein called the “Senior Notes”).

Payments of interest hereon on any Interest Payment Date will include interest accrued to, but excluding, such Interest Payment Date. Interest hereon shall be computed on the basis of a 360-day year of twelve 30-day months, provided that if this Senior Note has a maturity of one year or less, interest hereon shall be computed on the basis of actual days divided by 360.

If any Interest Payment Date, Maturity Date or date of earlier redemption or repayment of this Senior Note falls on a day which is not a Business Day, the related payment of principal, premium, if any, or interest shall be made on the next succeeding Business Day with the same force and effect as if made on the date such payment were due, and no interest shall accrue on the amount so payable for the period from and after such Interest Payment Date, Maturity Date or date of earlier redemption or repayment, as the case may be. “Business Day” means any day that is not a Saturday or Sunday and that is not a day on which banking institutions in The City of New York or the City of Chicago, Illinois generally are authorized or obligated by law or executive order to close.

This Senior Note will not be subject to any sinking fund. If so provided on the face of this Senior Note, this Senior Note may be redeemed by the Bank on and after the Initial Redemption Date, if any, specified on the face hereof. If no Initial Redemption Date is specified on the face

hereof, this Senior Note may not be redeemed prior to the Maturity Date. On and after the Initial Redemption Date, if any, this Senior Note may be redeemed at any time either in whole or in part from time to time in increments of $1,000 (provided that any remaining principal amount hereof shall be at least $250,000) at the option of the Bank at the applicable Redemption Price (as defined below), together with accrued and unpaid interest hereon at the applicable rate borne by this Senior Note to the date of redemption (each such date, a “Redemption Date”), on written notice given not more than 60 nor less than 30 calendar days prior to the Redemption Date by the Bank to the registered holder hereof. Whenever less than all the Senior Notes at any time outstanding are to be redeemed, the terms of the Senior Notes to be so redeemed shall be selected by the Bank. If less than all the Senior Notes with identical terms at any time outstanding are to be redeemed, the Senior Notes to be so redeemed shall be selected by the Paying Agent by lot or in any usual manner approved by it. In the event of redemption of this Senior Note in part only, a new Senior Note for the unredeemed portion hereof shall be issued in the name of the holder hereof upon the surrender hereof.

The “Redemption Price” shall initially be the Initial Redemption Percentage specified on the face hereof of the principal amount of this Senior Note to be redeemed and shall decline at each anniversary of the Initial Redemption Date specified on the face hereof by the Annual Redemption Percentage Reduction, if any, specified on the face hereof, of the principal amount to be redeemed until the Redemption Price is 100% of such principal amount.

This Senior Note may be subject to repayment at the option of the holder hereof in accordance with the terms hereof on the Holder’s Optional Repayment Date(s), if any, specified on the face hereof. If no Holder’s Optional Repayment Date is specified on the face hereof, this Senior Note will not be so repayable at the option of the holder hereof prior to maturity. On any Holder’s Optional Repayment Date, this Senior Note will be repayable in whole or in part in increments of $1,000 (provided that any remaining principal amount hereof will be at least $250,000) at the option of the holder hereof at a repayment price equal to 100% of the principal amount to be repaid, together with accrued and unpaid interest hereon payable to the date of repayment. For this Senior Note to be repaid in whole or in part at the option of the holder hereof on a Holder’s Optional Repayment Date, this Senior Note must be given, with the form entitled “Option to Elect Repayment” below duly completed, to the Paying Agent at its offices located at 50 South LaSalle Street (Level BB-A), Chicago, Illinois 60675, Attention: Securities Services, or at such other address which the Bank shall from time to time notify the holders of the Senior Notes, not more than 60 nor less than 30 days prior to such Holder’s Optional Repayment Date. Exercise of such repayment option by the holder hereof shall be irrevocable.

If this Senior Note is an Original Issue Discount Note and if an Event of Default with respect to the Senior Notes shall have occurred and be continuing, the Default Amount (as defined hereafter) of this Senior Note may be declared due and payable in the manner and with the effect provided herein. The “Default Amount” shall be equal to the adjusted issue price as of the first day of the accrual period as determined under Treasury Regulation Section 1.1275-1(b) (or successor regulation) under the United States Internal Revenue Code of 1986, as amended, in which the date of acceleration occurs increased by the daily portion of the original issue discount for each day in such accrual period ending on the date of acceleration, as determined under Treasury Regulation Section 1.1275-1(b)(or successor regulation) under the United States Internal Revenue Code of 1986, as amended. Upon payment of (i) the amount of principal or

premium, if any, so declared due and payable and (ii) interest on any overdue principal and overdue interest or premium, if any, (in each case to the extent that the payment of such interest shall be legally enforceable), all of the Bank’s obligations in respect of the payment of the principal of, and interest or premium, if any, on, this Senior Note shall terminate.

In case any Senior Note shall at any time become mutilated, destroyed, lost or stolen and such Senior Note or evidence satisfactory to the Bank of the loss, theft or destruction thereof (together with indemnity satisfactory to the Bank and such other documents or proof as may be required in the premises) shall be delivered to the Bank, a new Senior Note of like tenor will be issued by the Bank in exchange for the Senior Note so mutilated, or in lieu of the Senior Note so destroyed or lost or stolen. All expenses and reasonable charges associated with procuring the indemnity referred to above and with the preparation, authentication and delivery of a new Senior Note shall be borne by the holder of the Senior Note so mutilated, destroyed, lost or stolen. If any Senior Note which has matured or is about to mature shall become mutilated, destroyed, lost or stolen, the Bank may, instead of issuing a substitute Senior Note, pay or authorize the payment of the same (without surrender thereof except in the case of a mutilated Senior Note) upon compliance by the holder thereof with the provisions of this paragraph.

No recourse shall be had for the payment of the principal of, premium, if any, or interest on, this Senior Note, for any claim based hereon, or otherwise in respect hereof, against any shareholder, employee, officer or director, as such, past, present or future, of the Bank or of any successor corporation, either directly or through the Bank or any successor corporation, whether by virtue of any constitution, statute or rule of law or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and part of the consideration for the issue hereof, expressly waived and released.

The occurrence of any of the following events shall constitute an “Event of Default” with respect to this Senior Note: (i) default in the payment of any interest with respect to this Senior Note when due, which continues for 30 days; (ii) default in the payment of any principal of, or premium, if any, on, this Senior Note when due; (iii) the entry by a court having jurisdiction in the premises of (a) a decree or order for relief in respect of the Bank in an involuntary case or proceeding under any applicable United States federal or state bankruptcy, insolvency, reorganization or other similar law or (b) a decree or order appointing a conservator, receiver, liquidator, assignee, trustee, sequestrator or any other similar official of the Bank, or of substantially all of the property of the Bank, or ordering the winding up or liquidation of the affairs of the Bank, and the continuance of any such decree or order for relief or any such other decree or order unstayed and in effect, for a period of 60 consecutive days; or (iv) the commencement by the Bank of a voluntary case or proceeding under any applicable United States federal or state bankruptcy, insolvency, reorganization or other similar law or of any other case or proceeding to be adjudicated as bankrupt or insolvent, or the consent by the Bank to the entry of a decree or order for relief in an involuntary case or proceeding under any applicable United States federal or state bankruptcy, insolvency, reorganization or other similar law or to the commencement of any bankruptcy or insolvency case or proceeding, or the filing by the Bank of a petition or answer or consent seeking reorganization or relief under any applicable United States federal or state law, or the consent by the Bank to the filing of such petition or to the appointment of or taking possession by a custodian, receiver, liquidator, assignee, trustee, sequestrator or similar official of the Bank or of substantially all of the property of the Bank, or

the making by the Bank of an assignment for the benefit of creditors, or the taking of corporate action by the Bank in furtherance of any such action. If an Event of Default shall occur and be continuing, the holder of this Senior Note may declare the principal amount of, and accrued interest and premium, if any, on, this Senior Note due and payable immediately by written notice to the Bank. Upon such declaration and notice, such principal amount, accrued interest and premium, if any, shall become due and payable seven calendar days after such notice. Any Event of Default with respect to this Senior Note may be waived by the holder hereof.

No provision of this Senior Note shall alter or impair the obligation of the Bank, which is absolute and unconditional, to pay the principal of, and premium, if any, and interest on, this Senior Note in U.S. dollars at the times, places and rate herein prescribed.

The Bank shall cause to be kept at the corporate trust office of the Senior Note Registrar designated below a register (the register maintained in such corporate trust office or any other office or agency of the Bank in the Place of Payment herein referred to as the “Senior Note Register”) in which, subject to such reasonable regulations as it may prescribe, the Bank shall provide for the registration of the Senior Notes and of transfers of the Senior Notes. The Bank is hereby initially appointed “Senior Note Registrar” for the purpose of registering the Senior Notes and transfers of the Senior Notes as herein provided.

The transfer of this Senior Note is registrable in the Senior Note Register, upon surrender of this Senior Note for registration of transfer at the office or agency of the Bank in the Place of Payment, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Bank and the Paying Agent duly executed by, the holder hereof or his attorney duly authorized in writing, and thereupon one or more new Senior Notes of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees. Notwithstanding the foregoing, the Bank shall not be required to register the transfer of any Senior Note that has been called for redemption during a period beginning at the opening of business fifteen calendar days before the day of mailing of a notice of such redemption and ending at the close of business on the day of such mailing.

No service charge shall be made for any such registration of transfer or exchange, but the Bank may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

The Senior Notes are issuable only in registered form without coupons in minimum denominations of $250,000 and any integral multiple of $1,000 in excess thereof. Each owner of a beneficial interest in this Senior Note is required to hold a beneficial interest in $250,000 principal amount or any integral multiple of $1,000 in excess thereof of this Senior Note at all times.

Prior to due presentment of this Senior Note for registration of transfer, the Bank, the Paying Agent or any agent of the Bank or the Paying Agent may treat the person in whose name this Senior Note is registered as the owner hereof for all purposes, whether or not this Senior Note be overdue, and neither the Bank, the Paying Agent nor any such agent shall be affected by notice to the contrary.

All notices to the Bank under this Senior Note shall be in writing and addressed to the Bank at 50 South LaSalle Street (Level BB-A). Chicago, Illinois 60675. Attention: Securities Services, or to such other address of the Bank as the Bank may notify the holders of the Senior Notes.

This Senior Note shall be governed by, and construed in accordance with, the laws of the State of Illinois.

IN WITNESS WHEREOF, the Bank has caused this instrument to be duly executed.

THE NORTHERN TRUST COMPANY

By:

Authorized Signatory

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of the within Senior Note, shall be construed as though they were written out in full according to applicable laws or regulations.

TEN COM	-	as tenants in common
TEN ENT	-	as tenants by the entireties
JT TEN	-	as joint tenants with right of survivorship and not as tenants in common

UNIF GIFT MINT ACT-		Custodian
	(Cust)		(Minor)
under Uniform Gifts to Minors Act

(State)

Additional abbreviations may also be used

though not in the above list.

ASSIGNMENT

FOR VALUE RECEIVED, the undersigned hereby sell(s). assign(s) and transfer(s) unto

PLEASE INSERT SOCIAL SECURITY NUMBER OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

(Please print or typewrite name and address,

including postal zip code, of assignee)

the within Senior Note and all rights thereunder, and hereby irrevocably constitutes and appoints

to transfer said Senior Note on the books of the Bank, with full power of substitution in the premises.

Dated:                    

Notice: The signature to this assignment must correspond with the name as written upon the face of the within Senior Note in every particular, without alteration or enlargement or any change whatsoever.

OPTION TO ELECT REPAYMENT

The undersigned hereby irrevocably request(s) and instruct(s) the Bank to repay this Senior Note (or portion hereof specified below) pursuant to its terms and at a price equal to 100% of the principal amount hereof to be repaid, together with accrued and unpaid interest hereon, payable to the date of repayment, to the undersigned, at

(Please print or typewrite name and address of the undersigned)

For this Senior Note to be repaid, the undersigned must give to the Paying Agent at its offices located at 50 South LaSalle Street (Level BB-A), Chicago, Illinois 60675, Attention: Securities Services, or at such other place or places of which the Bank shall from time to time notify the holders of the Senior Notes, not more than 60 days nor less than 30 days prior to the date of repayment, this Senior Note with this “Option to Elect Repayment” form duly completed.

If less than the entire principal amount of this Senior Note is to be repaid, specify the portion hereof (which shall be increments of $1,000) which the holder elects to have repaid and specify the denomination or denominations (which shall be $250,000 or an integral multiple of $1,000 in excess thereof) of the Senior Notes to be issued to the holder for the portion of this Senior Note not being repaid (in the absence of any such specification, one such Senior Note will be issued for the portion not being repaid):

$            

Dated:                    

NOTICE: The signature on this “Option to Elect Repayment” form must correspond with the name as written upon the face of the within Senior Note in every particular, without alteration or enlargement or any change whatsoever.

EX-4.(IV)

Exhibit (4)(iv)

Rev. 08/11

UNLESS THIS SENIOR NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE BANK OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY SENIOR NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

IF THIS SENIOR NOTE IS ISSUED WITH “ORIGINAL ISSUE DISCOUNT” FOR PURPOSES OF SECTION 1273 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED, THE FOLLOWING SHALL BE COMPLETED: THE FOLLOWING INFORMATION IS PROVIDED SOLELY FOR PURPOSES OF APPLYING SECTIONS 1272, 1273 AND 1275 OF THE UNITED STATES INTERNAL REVENUE CODE OF 1986, AS AMENDED, TO THIS SENIOR NOTE. THE ISSUE DATE OF THIS SENIOR NOTE IS                     . THE ISSUE PRICE OF THIS SENIOR NOTE IS             % OF ITS PRINCIPAL AMOUNT. THE AMOUNT OF ORIGINAL ISSUE DISCOUNT ON THIS SENIOR NOTE IS $         PER $1,000 OF THE INITIAL PRINCIPAL AMOUNT, THE YIELD TO MATURITY IS         %, AND THE AMOUNT OF THE ORIGINAL ISSUE DISCOUNT ALLOCABLE TO THE INITIAL SHORT ACCRUAL PERIOD, IF ANY, IS $            PER $1,000 OF THE INITIAL PRINCIPAL AMOUNT, DETERMINED ON THE BASIS OF THE EXACT METHOD.

No. SEN FLR -	REGISTERED
CUSIP NO.:

THE NORTHERN TRUST COMPANY

GLOBAL SENIOR BANK NOTE

(Floating Rate)

ORIGINAL ISSUE DATE:	PRINCIPAL AMOUNT:
INITIAL BASE RATE:	MATURITY DATE:
INTEREST RATE BASIS:	INDEX MATURITY:
SPREAD AND/OR SPREAD MULTIPLIER:	REGULAR RECORD DATES (If other than the 15th day prior to each Interest Payment Date)

MAXIMUM INTEREST RATE:                     %	MINIMUM INTEREST RATE:                     %
INTEREST PAYMENT DATES:	INTEREST PAYMENT PERIOD:
INTEREST RESET DATES:	INTEREST RESET PERIOD:
INITIAL REDEMPTION DATE:	ANNUAL REDEMPTION
INITIAL REDEMPTION PERCENTAGE:                     % ORIGINAL ISSUE DISCOUNT NOTE:                 Yes:                      No:                     OTHER PROVISIONS:	PERCENTAGE REDUCTION:                     HOLDER’S OPTIONAL REPAYMENT DATE:                     OID AMOUNT:                     CALCULATION AGENT: DEFAULT RATE:                     % ALTERNATE RATE EVENT SPREAD:

The Northern Trust Company, an Illinois banking corporation (the “Bank”), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal amount specified on the face hereof in United States Dollars on the Maturity Date specified above and to pay interest thereon from the Original Issue Date specified above or from the most recent interest payment date (or, if the Interest Reset Period specified above is daily or weekly, from, and including, the day following the most recent Regular Record Date) to which interest on this Senior Note (or any predecessor Senior Note) has been paid or made available for payment (each, an “Interest Payment Date”), on the Interest Payment Dates specified above and at maturity or upon earlier redemption or repayment, if applicable, commencing on the first Interest Payment Date next succeeding the Original Issue Date (or, if the Original Issue Date is between a Regular Record Date and the Interest Payment Date immediately following such Regular Record Date, on the second Interest Payment Date following the Original Issue Date), at a rate per annum equal to the Initial Base Rate specified above, as adjusted by the addition or subtraction of the Spread, if any, specified above and/or by the multiplication by the Spread Multiplier, if any specified above, until the first Interest Reset Date following the Original Issue Date and, on and after such Interest Reset Date, at the rate determined in accordance with the provisions set forth herein, until the principal hereof is paid or made available for payment, and (to the extent that the payment of such interest shall be legally enforceable) at the last rate in effect prior to any payment default (or the Default Rate per annum specified above, if such Default Rate is specified above) on any overdue principal and premium, if any, and on any overdue installment of interest. The interest so payable, and punctually paid or made available for payment, on any Interest Payment Date will be paid to the person in whose name this Senior Note (or any predecessor Senior Note) is registered at the close of business on the Regular Record Date for such interest, which shall be the 15th calendar day (whether or not a Business Day (as defined below)) before such Interest Payment Date (unless otherwise specified on the face hereof); provided, however, that interest payable at maturity or upon earlier redemption or repayment, if applicable, will be payable to the person to whom principal shall be payable.

Payment of principal of, and premium, if any, and interest on, this Senior Note will be made in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts. The Bank will at all times appoint and maintain a paying agent (the “Paying Agent”) authorized by the Bank to pay the principal of, and premium, if any, and interest on, this Senior Note on behalf of the Bank and having an office or agency (the “Paying Agent Office”) in The City of New York or the City of Chicago, Illinois (the “Place of Payment”), where this Senior Note may be presented or surrendered for payment and where notices, designations or requests in respect of payments with respect to this Senior Note may be served. The Bank has initially appointed itself as such Paying Agent, with the Paying Agent Office currently located at 50 South LaSalle Street (Level BB-A), Chicago, Illinois 60675, Attention: Securities Services.

THIS SENIOR NOTE IS A DIRECT, UNCONDITIONAL, UNSECURED AND UNSUBORDINATED GENERAL OBLIGATION OF THE BANK. THIS SENIOR NOTE IS NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION, IS NOT A DEPOSIT OF, OR GUARANTEED BY, THE BANK, AND IS SUBJECT TO INVESTMENT RISKS, INCLUDING POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED. THIS SENIOR NOTE RANKS PARI PASSU WITH ALL OTHER UNSECURED AND UNSUBORDINATED OBLIGATIONS OF THE BANK, EXCEPT DEPOSITS AND OTHER OBLIGATIONS THAT ARE SUBJECT TO A PRIORITY OR PREFERENCE. UNDER APPLICABLE LAW, CLAIMS OF CERTAIN CREDITORS, INCLUDING HOLDERS OF DEPOSITS IN THE BANK, WOULD BE ENTITLED TO PRIORITY OVER CLAIMS OF UNSECURED GENERAL CREDITORS OF THE BANK, INCLUDING THE HOLDER OF THIS SENIOR NOTE, IN THE EVENT OF A LIQUIDATION OR OTHER RESOLUTION OF THE BANK.

Payment of the principal of, and premium, if any, and interest on, this Senior Note due at maturity or upon earlier redemption or repayment, if applicable, will be made in immediately available funds upon presentation and surrender of this Senior Note to the Paying Agent at the Paying Agent Office in the Place of Payment; provided that this Senior Note is presented to the Paying Agent in time for the Paying Agent to make such payment in accordance with its normal procedures. Payments of interest on this Senior Note (other than at maturity or upon earlier redemption or repayment) will be made by wire transfer to such account as has been appropriately designated to the Paying Agent by the person entitled to such payments.

This Senior Note is one of a duly authorized issue of Senior Bank Notes due from 30 days to fifteen years from date of issue of the Bank (herein called the “Senior Notes”).

Unless otherwise indicated on the face hereof, if the rate of interest on this Senior Note resets daily, weekly or monthly the Interest Payment Date for this Senior Note will be the third Wednesday of each month or the third Wednesday of March, June, September and December of each year; if the rate of interest on this Senior Note resets quarterly, the Interest Payment Date for this Senior Note will be the third Wednesday of March, June, September and December of each year; if the rate of interest on this Senior Note resets semi-annually, the

Interest Payment Date for this Senior Note will be the third Wednesday of each of two months of each year specified on the face hereof that are six months apart; and if the rate of interest on this Senior Note resets annually, the Interest Payment Date for this Senior Note will be the third Wednesday of the month specified on the face hereof. If any Interest Payment Date (unless it is also the Maturity Date) for this Senior Note falls on a day that is not a Business Day, such Interest Payment Date will be postponed to the next succeeding Business Day; provided, however, that if the Interest Rate Basis specified on the face hereof is LIBOR and such next succeeding Business Day is in the next succeeding calendar month, such Interest Payment Date (unless it is also the Maturity Date) will be the immediately preceding Business Day. If any Maturity Date or date of earlier redemption or repayment of this Senior Note falls on a day that is not a Business Day, the related payment of interest shall be made on the next succeeding Business Day with the same force and effect as if made on the date such payment were due, and no interest shall accrue on the amount so payable for the period from and after such Maturity Date or date of earlier redemption or repayment. “Business Day” means any day other than a Saturday, Sunday or a day on which banking institutions in The City of New York or the City of Chicago, Illinois generally are authorized or obligated by law or executive order to close, and with respect to Senior Notes with respect to which the Interest Rate Basis specified on the face hereof is LIBOR, any day on which dealings in U.S. dollars are transacted in the London interbank market (a “London Business Day”).

This Senior Note will not be subject to any sinking fund. If so provided on the face of this Senior Note, this Senior Note may be redeemed by the Bank on and after the Initial Redemption Date, if any, specified on the face hereof. If no Initial Redemption Date is specified on the face hereof, this Senior Note may not be redeemed prior to the Maturity Date. On and after the Initial Redemption Date, if any, this Senior Note may be redeemed at any time either in whole or in part from time to time in increments of $1,000 (provided that any remaining principal amount hereof shall be at least $250,000) at the option of the Bank at the applicable Redemption Price (as defined below), together with accrued and unpaid interest hereon at the applicable rate borne by this Senior Note to the date of redemption (each such date, a “Redemption Date”), on written notice given not more than 60 nor less than 30 calendar days prior to the Redemption Date by the Bank to the registered holder hereof. Whenever less than all the Senior Notes at any time outstanding are to be redeemed, the terms of the Senior Notes to be so redeemed shall be selected by the Bank. If less than all the Senior Notes with identical terms at any time outstanding are to be redeemed, the Senior Notes to be so redeemed shall be selected by the Paying Agent by lot or in any usual manner approved by it. In the event of redemption of this Senior Note in part only, a new Senior Note for the unredeemed portion hereof shall be issued in the name of the holder hereof upon the surrender hereof.

The “Redemption Price” shall initially be the Initial Redemption Percentage specified on the face hereof of the principal amount of this Senior Note to be redeemed and shall decline at each anniversary of the Initial Redemption Date specified on the face hereof by the Annual Redemption Percentage Reduction, if any, specified on the face hereof, of the principal amount to be redeemed until the Redemption Price is 100% of such principal amount.

This Senior Note may be subject to repayment at the option of the holder hereof in accordance with the terms hereof on the Holder’s Optional Repayment Date(s), if any, specified on the face hereof. If no Holder’s Optional Repayment Date is specified on the face hereof, this Senior Note will not be so repayable at the option of the holder hereof prior to maturity. On any Holder’s Optional Repayment Date, this Senior Note will be repayable in whole or in part in increments of $1,000 (provided that any remaining principal amount hereof will be at least $250,000) at the option of the holder hereof at a repayment price equal to 100% of the principal amount to be repaid, together with accrued and unpaid interest hereon payable to the date of repayment. For this Senior Note to be repaid in whole or in part at the option of the holder hereof on a Holder’s Optional Repayment Date, this Senior Note must be given, with the form entitled “Option to Elect Repayment” below duly completed, to the Paying Agent at its offices located at 50 South LaSalle Street (Level BB-A), Chicago, Illinois 60675, Attention: Securities Services, or at such address which the Bank shall from time to time notify the holders of the Senior Notes, not more than 60 nor less than 30 days prior to such Holder’s Optional Repayment Date. Exercise of such repayment option by the holder hereof shall be irrevocable.

The rate of interest on this Senior Note will be reset daily, weekly, monthly, quarterly, semi-annually or annually (each such period, an “Interest Reset Period” for this Senior Note, and the first calendar day of an Interest Reset Period, an “Interest Reset Date”), as specified on the face hereof. Unless otherwise indicated on the face hereof, if this Senior Note resets daily, the Interest Reset Date will be each Business Day; if this Senior Note resets weekly and the Interest Rate Basis is not the Treasury Rate, the Interest Reset Date will be the Wednesday of each week; if this Senior Note resets weekly and the Interest Rate Basis is the Treasury Rate, the Interest Reset Date will be the Tuesday of each week (except as provided below); if this Senior Note resets monthly, the Interest Reset Date will be the third Wednesday of each month; if this Senior Note resets quarterly, the Interest Reset Date will be the third Wednesday of March, June, September and December; if this Senior Note resets semi-annually, the Interest Reset Date will be the third Wednesday of each of two months of each year that are six months apart, as specified on the face hereof; and if this Senior Note resets annually, the Interest Reset Date will be the third Wednesday of one month of each year, as specified on the face hereof; provided, however, that the base rate in effect from the Original Issue Date to the first Interest Reset Date will be the Initial Base Rate specified on the face hereof. If any Interest Reset Date with respect to this Senior Note would otherwise be a day that is not a Business Day, such Interest Reset Date will be the next succeeding Business Day, except that in the case that the Interest Rate Basis specified on the face hereof is LIBOR, if such Business Day is in the next succeeding calendar month, such Interest Reset Date will be the immediately preceding Business Day.

All calculations relating to this Senior Note will be made by the “Calculation Agent.” The Bank will serve as Calculation Agent for this Senior Note as of its Original Issue Date, unless otherwise specified on the face hereof. The Bank may appoint a different institution to serve as Calculation Agent from time to time after the Original Issue Date of this Senior Note without the consent of the holder and without notice.

The Calculation Agent will determine the interest rate that takes effect on an Interest Reset Date by reference to the Interest Determination Date. Unless otherwise specified on the face hereof, (i) if the Interest Rate Basis is not LIBOR or the Treasury Rate, the Interest Determination Date will be the second Business Day before the Interest Reset Date; (ii) if the Interest Rate Basis is LIBOR, the Interest Determination Date will be the second London Business Day (as defined below) preceding the Interest Reset Date; and (iii) if the Interest Rate Basis is the Treasury Rate, the Interest Determination Date will be the day of the week in which the Interest Reset Date falls on which treasury bills — i.e., direct obligations of the U.S. government — would normally be auctioned. Treasury bills are usually sold at auction on the Monday of each week, unless that day is a legal holiday, in which case the auction is usually held on the following Tuesday but may be held on the preceding Friday. If as the result of a legal holiday an auction is held on the preceding Friday, that Friday will be the Treasury Interest Determination Date relating to the Interest Reset Date occurring in the next succeeding week. If the auction is held on a day that would otherwise be an Interest Reset Date, then the Interest Reset Date will instead be the first Business Day following the auction date.

Unless the Interest Rate is LIBOR, the Calculation Agent will calculate the interest rate that takes effect on a particular Interest Reset Date no later than the corresponding Interest Calculation Date. The Interest Calculation Date will be the earlier of (i) the tenth calendar day after the Interest Determination Date or, if that tenth calendar day is not a Business Day, the next succeeding Business Day, and (ii) the Business Day immediately preceding the Interest Payment Date or the Maturity Date on which the next payment of interest will be due. The Calculation Agent need not wait until the relevant Interest Calculation Date to determine the interest rate if the rate information it needs to make the determination is available from the relevant sources sooner.

For each Interest Reset Period, the Calculation Agent will calculate the amount of accrued interest by multiplying the face amount of this Senior Note by an accrued interest factor for the Interest Reset Period. This factor will equal the sum of the interest factors calculated for each day during the Interest Reset Period. The interest factor for each day will be expressed as a decimal and will be calculated by dividing the interest rate (also expressed as a decimal) applicable to that day (i) by 360, if the Interest Rate Basis is the Commercial Paper Rate, the Prime Rate, LIBOR, the CD Rate or the Federal Funds Rate, or (ii) by the actual number of days in the year, if the Interest Rate Basis is the Treasury Rate or the CMT Rate.

Upon the request of the holder of this Senior Note, the Calculation Agent will provide such holder with the interest rate then in effect for this Senior Note and, if determined, the interest rate that will become effective on the next Interest Reset Date. The Calculation Agent’s determination of any interest rate, and its calculation of the amount of interest for any Interest Reset Period, will be final and binding in the absence of manifest error.

All percentages resulting from any calculation relating to this Senior Note will be rounded upward or downward, as appropriate, to the next higher or lower one hundred-thousandth of a percentage point. For example, 9.876541% (or .09876541) would be rounded

down to 9.87654% (or .0987654) and 9.876545% (or .09876545) would be rounded up to 9.87655% (or .0987655). All amounts used in or resulting from any calculation relating to this Senior Note will be rounded upward or downward, as appropriate, to the nearest cent, with one half cent or more being rounded upward.

In determining the Base Rate that applies this Senior Note during a particular Interest Reset Period, the Calculation Agent may obtain rate quotes from various banks or dealers active in the relevant market, as described in the following subsections. Those reference banks and dealers may include the Calculation Agent itself, including the Bank, and its affiliates.

Except as otherwise provided herein, the rate of interest on this Senior Note for each Interest Reset Date will be the rate determined in accordance with the provisions set forth under the applicable heading below corresponding to the Interest Rate Basis specified on the face hereof. Notwithstanding the foregoing, the interest rate hereon shall not be greater than the Maximum Interest Rate, if any, specified on the face hereof and shall not be lower than the Minimum Interest Rate, if any, specified on the face hereof. In addition, the interest rate hereon will in no event be greater than the maximum rate permitted by Illinois law, as the same may be modified by United States law of general application.

Commercial Paper Rate. If the Interest Rate Basis of this Senior Note is the Commercial Paper Rate, this Senior Note will bear interest at a Base Rate equal to the Commercial Paper Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The Commercial Paper Rate will be the Money Market Yield (as defined below) of the rate, for the relevant Interest Determination Date, for commercial paper having the Index Maturity (as defined below) specified on the face of this Senior Note, as published in H.15(519) (as defined below) under the heading “Commercial Paper — Nonfinancial.” If the Commercial Paper Rate cannot be determined as described above, the following procedures will apply:

(i) If the rate described above does not appear in H.15(519) at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), then the Commercial Paper Rate will be the rate, for the relevant Interest Determination Date, for commercial paper having the Index Maturity specified on the face of this Senior Note, as published in H.15 Daily Update (as defined below) or another recognized electronic source used for displaying that rate, under the heading “Commercial Paper Nonfinancial.”

(ii) If the rate described above does not appear in H.15(519), H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made

earlier and the rate is available from one of those sources at that time), the Commercial Paper Rate will be the Money Market Yield of the arithmetic mean of the offered rates, as of 11:00 A.M., New York City time, on the relevant Interest Determination Date, by three leading U.S. dollar commercial paper dealers in New York City selected by the Calculation Agent for U.S. dollar commercial paper that has the relevant Index Maturity and is placed for an industrial issuer whose bond rating is “AA”, or the equivalent, from a nationally recognized rating agency.

(iii) If fewer than three dealers selected by the Calculation Agent are quoting as described above, the Commercial Paper Rate for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

LIBOR. If the Interest Rate Basis of this Senior Note is LIBOR, this Senior Note will bear interest at a Base Rate equal to LIBOR, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof. LIBOR will be the London interbank offered rate for deposits of U.S. dollars. LIBOR will be determined in the following manner:

(i) LIBOR will be the offered rate appearing on the Reuters Screen LIBOR01 Page (as defined below) as of 11:00 A.M., London time, on the relevant LIBOR Interest Determination Date, for deposits of U.S. dollars having the relevant Index Maturity beginning on the relevant Interest Reset Date

(ii) If no rate appears on the Reuters Screen LIBOR01 Page, then LIBOR will be determined on the basis of the rates, at approximately 11:00 A.M., London time, on the relevant LIBOR Interest Determination Date, for deposits of U.S. dollars having the relevant Index Maturity, beginning on the relevant Interest Reset Date and in a Representative Amount (as defined below), are offered to prime banks in the London interbank market by four major banks in that market selected by the Calculation Agent. The Calculation Agent will request the principal London office of each of these banks to provide a quotation of its rate. If at least two quotations are provided, LIBOR for the relevant LIBOR Interest Determination Date will be the arithmetic mean of the quotations.

(iii) If fewer than two quotations are provided as described above, LIBOR for the relevant LIBOR Interest Determination Date will be the arithmetic mean of the rates for loans of U.S. dollars having the relevant Index Maturity, beginning on the relevant Interest Reset Date and in a Representative Amount to leading European banks quoted, at approximately 11:00 A.M., New York City time, on that LIBOR Interest Determination Date, by three major banks in New York City selected by the Calculation Agent.

(iv) If fewer than three banks selected by the Calculation Agent are quoting as described above, LIBOR for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

Treasury Rate. If the Interest Rate Basis of this Senior Note is the Treasury Rate, this Senior Note will bear interest at a Base Rate equal to the Treasury Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The Treasury Rate will be the rate for the auction, on the relevant Treasury Interest Determination Date, of treasury bills having the Index Maturity specified in the on the face of this Senior Note, as that rate appears on Reuters Screen USAUCTION 10 or USAUCTION11 under the heading “Investment Rate.” If the Treasury Rate cannot be determined in this manner, the following procedures will apply:

(i) If the rate described above does not appear on either page at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), the Treasury Rate will be the Bond Equivalent Yield (as defined below) of the rate, for the relevant Interest Determination Date, for the type of treasury bill described above, as published in H.15 Daily Update or another recognized electronic source used for displaying that rate, under the heading “U.S. Government Securities/Treasury Bills/Secondary Market.”

(ii) If the rate described in the prior paragraph does not appear in H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), the Treasury Rate will be the Bond Equivalent Yield of the auction rate, for the relevant Treasury Interest Determination Date and for treasury bills of the kind described above, as announced by the U.S. Department of the Treasury.

(iii) If the auction rate described in the prior paragraph is not so announced by 3_:00 P.M., New York City time, on the relevant Interest Calculation Date, or if no such auction is held for the relevant week, then the Treasury Rate will be the Bond Equivalent Yield of the rate, for the relevant Treasury Interest Determination Date and for treasury bills having a remaining maturity closest to the specified Index Maturity, as published in H.15(519) under the heading “U.S. Government Securities/Treasury Bills/Secondary Market.”

(iv) If the rate described in the prior paragraph does not appear in H.15(519) at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of

those sources at that time), then the Treasury Rate will be the rate, for the relevant Treasury Interest Determination Date and for treasury bills having a remaining maturity closest to the _specified Index Maturity, as published in H.15 Daily Update or another recognized electronic source used for displaying that rate, under the heading “U.S. Government Securities/Treasury Bills/Secondary Market.”

(v) If the rate described in the prior paragraph does not appear in H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), the Treasury Rate will be the Bond Equivalent Yield of the arithmetic mean of the secondary market bid rates as of approximately 3:30 P.M., New York City time, on the relevant Treasury Interest Determination Date, of three primary U.S. government securities dealers in New York City selected by the Calculation Agent for the issue of treasury bills with a remaining maturity closest to the specified Index Maturity.

(vi) If fewer than three dealers selected by the Calculation Agent are quoting as described in the prior paragraph, the Treasury Rate in effect for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

CMT Rate. If the Interest Rate Basis of this Senior Note is the CMT Rate, this Senior Note will bear interest at a Base Rate equal to the CMT Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The CMT Rate will be the rate displayed on the Designated CMT Reuters Screen Page (as defined below) under the heading “. . . Treasury Constant Maturities . . . Federal Reserve Board Release H.15 . . . Mondays Approximately 3:45 P.M.,” under the column for the Designated CMT Index Maturity (as defined below), as follows: (a) if the Designated CMT Reuters Screen Page is Reuters Screen FEDCMT Page, the rate for the relevant Interest Determination Date, or (b) if the Designated CMT Reuters Screen Page is Reuters Screen FEDCMT Page, the weekly or monthly average, as specified on the face of this Senior Note, for the week that ends immediately before the week in which the relevant Interest Determination Date falls, or for the month that ends immediately before the month in which the relevant Interest Determination Date falls, as applicable. If the CMT Rate cannot be determined in this manner, the following procedures will apply:

(i) If the applicable rate described above is not displayed on the relevant Designated CMT Reuters Screen Page at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), then the CMT Rate will be the applicable treasury constant maturity rate described above — that is, for the Designated CMT Index Maturity and for either the relevant Interest Determination Date or the weekly or monthly average, as applicable — as published in H.15(519).

(ii) If the applicable rate described above does not appear in H.15(519) at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), then the CMT Rate will be the treasury constant maturity rate, or other U.S. treasury rate, for the Designated CMT Index Maturity and with reference to the relevant Interest Determination Date, that (a) is published by the Board of Governors of the Federal Reserve System, or the U.S. Department of the Treasury, and (b) is determined by the Calculation Agent to be comparable to the applicable rate formerly displayed on the Designated CMT Reuters Screen Page and published in H.15(519).

(iii) If the rate described in the prior paragraph does not appear at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), then the CMT Rate will be the yield to maturity of the arithmetic mean of the offered rates, as of approximately 3:30 P.M., New York City time, on the relevant Interest Determination Date, of three primary U.S. government securities dealers in New York City selected by the Calculation Agent for the most recently issued treasury notes having an original maturity of approximately the Designated CMT Index Maturity and a remaining term to maturity of not less than the Designated CMT Index Maturity minus one year, and in a Representative Amount. In selecting these offered rates, the Calculation Agent will request quotations from five of these primary dealers and will disregard the highest quotation — or, if there is equality, one of the highest — and the lowest quotation — or, if there is equality, one of the lowest. Treasury notes are direct, non-callable, fixed rate obligations of the U.S. government.

(iv) If the Calculation Agent is unable to obtain three quotations of the kind described in the prior paragraph, the CMT rate will be the yield to maturity of the arithmetic mean of the offered rates, as of approximately 3:30 P.M., New York City time,, on the relevant Interest Determination Date, of three primary U.S. government securities dealers in New York City selected by the Calculation Agent for treasury notes with an original maturity longer than the Designated CMT Index Maturity, with a remaining term to maturity closest to the Designated CMT Index Maturity and in a Representative Amount. In selecting these offered rates, the Calculation Agent will request quotations from five of these primary dealers and will disregard the highest quotation — or, if there is equality, one of the highest — and the lowest quotation — or, if there is equality, one of the lowest If two treasury notes with an original maturity longer than the Designated

CMT Index Maturity have remaining terms to maturity that are equally close to the Designated CMT Index Maturity, the Calculation Agent will obtain quotations for the treasury note with the shorter remaining term to maturity.

(v) If fewer than five but more than two of these primary dealers are quoting as described in the prior paragraph, then the CMT Rate for the relevant Interest Determination Date will be based on the arithmetic mean of the offered rates so obtained, and neither the highest nor the lowest of those quotations will be disregarded.

(vi) If two or fewer primary dealers selected by the Calculation Agent are quoting as described above, the CMT Rate in effect for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

CD Rate. If the Interest Rate Basis of this Senior Note is the CD Rate, this Senior Note will bear interest at a Base Rate equal to the CD Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The CD Rate will be the rate, on the relevant Interest Determination Date, for negotiable U.S. dollar certificates of deposit having the Index Maturity specified on the face of this Senior Note, as published in H.15(519) under the heading “CDs (Secondary Market).” If the CD Rate cannot be determined in this manner, the following procedures will apply:

(i) If the rate described above does not appear in H.15(519) at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), then the CD Rate will be the rate, for the relevant Interest Determination Date, described above as published in H.15 Daily Update or another recognized electronic source used for displaying that rate, under the heading “CDs (Secondary Market).”

(ii) If the rate described above does not appear in H.15(519), H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), the CD Rate will be the arithmetic mean of the rates offered as of 10:00 A.M., New York City time, on the relevant Interest Determination Date, by three leading nonbank dealers in negotiable U.S. dollar certificates of deposit in New York City, as selected by the Calculation Agent for negotiable U.S. dollar certificates of deposit of major U.S. money center banks with a remaining maturity closest to the specified Index Maturity, and in a Representative Amount.

(iii) If fewer than three dealers selected by the Calculation Agent are quoting as described above, the CD Rate in effect for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

Federal Funds Rate. If the Interest Rate Basis of this Senior Note is the Federal Funds Rate, this Senior Note will bear interest at a Base Rate equal to the Federal Funds Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The Federal Funds Rate will be the rate for U.S. dollar federal funds on the relevant Interest Determination Date, as published in H.15(519) under the heading “Federal Funds (Effective),” as that rate is displayed on Reuters Screen FEDFUNDS1 Page. If the Federal Funds Rate cannot be determined in this manner, the following procedures will apply:

(i) If the rate described above is not displayed on Reuters Screen FEDFUNDS1 Page at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), then the Federal Funds Rate, for the relevant Interest Determination Date, will be the rate described above as published in H.15 Daily Update or another recognized electronic source used for displaying that rate, under the heading “Federal Funds (Effective).”

(ii) If the rate described above is not displayed on Reuters Screen FEDFUNDS1 Page and does not appear in H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), the Federal Funds Rate will be the arithmetic mean of the rates for the last transaction in overnight, U.S. dollar federal funds arranged, before 9:00 A.M., New York City time, on the relevant Interest Determination Date, by three leading brokers of U.S. dollar federal funds transactions in New York City selected by the Calculation Agent.

(iii) If fewer than three brokers selected by the Calculation Agent are quoting as described above, the Federal Funds Rate in effect for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

Prime Rate. If the Interest Rate Basis of this Senior Note is the Prime Rate, this Senior Note will bear interest at a Base Rate equal to the Prime Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The Prime Rate will be the rate, for the relevant Interest Determination Date, published in H.15(519) under the heading “Bank Prime Loan.” If the Prime Rate cannot be determined as described above, the following procedures will apply.

(i) If the rate described above does not appear in H.15(519) at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), then the Prime Rate will be the rate, for the relevant Interest Determination Date, as published in H.15 Daily Update or another recognized electronic source used for the purpose of displaying that rate, under the heading “Bank Prime Loan.”

(ii) If the rate described above does not appear in H.15(519), H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), then the Prime Rate will be the arithmetic mean of the rates of interest publicly announced by each bank appearing on the Reuters Screen US PRIME 1 Page (as defined below) as that bank’s prime rate or base lending rate, as of 11:00 A.M., New York City time, on the relevant Interest Determination Date.

(iii) If fewer than four of these rates appear on the Reuters Screen US PRIME 1 Page, the Prime Rate will be the arithmetic mean of the prime rates or base lending rates, as of the close of business on the relevant Interest Determination Date, of three major banks in New York City selected by the Calculation Agent. For this purpose, the Calculation Agent will use rates quoted on the basis of the actual number of days in the year divided by a 360-day year.

(iv) If fewer than three banks selected by the Calculation Agent are quoting as described above, the Prime Rate for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

Definitions of Terms Used in Interest Rate Bases. The terms listed below are defined as follows:

“Bond Equivalent Yield” means a yield expressed as a percentage and calculated in accordance with the following formula:

            DxN              x 100

    360 – (DxM)            

where (i) “D” means the annual rate for treasury bills quoted on a bank discount basis and expressed as a decimal, (ii) “N” means the number of days in the year, 365 or 366, as the case may be, and (iii) “M” means the actual number of days in the applicable Interest Reset Period.

“Business Day” means, for purposes of calculating interest on this Senior Note, a day that is a Monday, Tuesday, Wednesday, Thursday or Friday that is not a day on which banking institutions in New York City generally are authorized or obligated by law, regulation or executive order to close and, if the Interest Rate Basis specified on the face hereof is LIBOR, is also a London Business Day.

“Designated CMT Index Maturity” means the Index Maturity for a Note having as its Interest Rate Basis the CMT Rate and will be the original period to maturity of a U.S. treasury security — either 1, 2, 3, 5, 7, 10, 20 or 30 years — specified in the applicable pricing supplement. If no such original maturity period is so specified, the Designated CMT Index Maturity will be 2 years.

“Designated CMT Reuters Screen Page” means the Reuters Screen Page specified on the face of this Senior Note (if the Interest Rate Basis is the CMT Rate) that displays treasury constant maturities as reported in H.15(519). If no Reuters Screen Page is so specified, then the applicable page will be Reuters Screen FEDCMT Page. If Reuters Screen FEDCMT Page applies but this Senior Note does not specify whether the weekly or monthly average applies, the weekly average will apply.

“H.15(519)” means the weekly statistical release entitled “Statistical Release H.15 (519),” or any successor publication, published by the Board of Governors of the Federal Reserve System.

“H.15 Daily Update” means the daily update of H.15(519) available through the world wide web site of the Board of Governors of the Federal Reserve System, at http://www.federalreserve.gov/releases/h15/update or any successor site or publication.

“Index Maturity” means the period to maturity of the instrument or obligation on which the interest rate formula is based, as specified on the face of this Senior Note.

“London Business Day” means any day on which dealings in U.S. dollars are transacted in the London interbank market.

“Money Market Yield” means a yield expressed as a percentage and calculated in accordance with the following formula:

            D x 360             x 100

360 – (DxM)            

where (a) “D” means the annual rate for commercial paper quoted on a bank discount basis and expressed as a decimal, and (b) “M” means the actual number of days in the relevant Interest Reset Period.

“Representative Amount” means an amount that, in the Calculation Agent’s judgment, is representative of a single transaction in the relevant market at the relevant time.

“Reuters Screen LIBOR01 Page” means the display on the Reuters Monitor Money Rates Service, or any successor service, on the page designated as “LIBO” or any replacement page or pages on which London interbank rates of major banks for U.S. dollars are displayed.

“Reuters Screen US PRIME 1 Page” means the display on the “US PRIME 1” page on the Reuters Monitor Money Rates Service, or any successor service, or any replacement page or pages on that service, for the purpose of displaying prime rates or base lending rates of major U.S. banks.

“Reuters Screen Page” means the display on Reuters, or any successor service, on the page or pages specified in this Subordinated Note, or any replacement page or pages on that service.

“Reuters Screen US PRIME 1 Page” means the display on the “US PRIME 1” page on the Reuters Monitor Money Rates Service, or any successor service, or any replacement page or pages on that service, for the purpose of displaying prime rates or base lending rates of major U.S. banks.

References to particular headings on pages designated by the following terms include any successor or replacement heading or headings as determined by the Calculation Agent: CMT Reuters Screen Page, H.15(519), H.15 Daily Update, Reuters Screen LIBOR Page, Reuters Screen US PRIME 1 Page, or Reuters Screen Page.

If this Senior Note is an Original Issue Discount Note and if an Event of Default with respect to this Senior Note shall have occurred and be continuing, the Default Amount (as defined hereafter) of this Senior Note may be declared due and payable in the manner and with the effect provided herein. The “Default Amount” shall be equal to the adjusted issue price as of the first day of the accrual period as determined under Treasury Regulation Section 1.1275-1(b) (or successor regulation) under the United States Internal Revenue Code of 1986, as amended, in which the date of acceleration occurs increased by the daily portion of the original issue discount for each day in such accrual period ending on the date of acceleration, as determined under

Treasury Regulation Section 1.1275-1(b) (or successor regulation) under the United States Internal Revenue Code of 1986, as amended. Upon payment of (i) the amount of principal or premium, if any, so declared due and payable and (ii) interest on any overdue principal and overdue interest or premium, if any (in each case to the extent that the payment of such interest shall be legally enforceable), all of the Bank’s obligations in respect of the payment of the principal of, and interest or premium, if any, on, this Senior Note shall terminate.

In case any Senior Note shall at any time become mutilated, destroyed, lost or stolen and such Senior Note or evidence satisfactory to the Bank of the loss, theft or destruction thereof (together with indemnity satisfactory to the Bank and such other documents or proof as may be required in the premises) shall be delivered to the Bank, a new Senior Note of like tenor will be issued by the Bank in exchange for the Senior Note so mutilated, or in lieu of the Senior Note so destroyed or lost or stolen. All expenses and reasonable charges associated with procuring the indemnity referred to above and with the preparation, authentication and delivery of a new Senior Note shall be borne by the holder of the Senior Note so mutilated, destroyed, lost or stolen. If any Senior Note which has matured or is about to mature shall become mutilated, destroyed, lost or stolen, the Bank may, instead of issuing a substitute Senior Note, pay or authorize the payment of the same (without surrender thereof except in the case of a mutilated Senior Note) upon compliance by the holder thereof with the provisions of this paragraph.

No recourse shall be had for the payment of the principal of, premium, if any, or interest on, this Senior Note, for any claim based hereon, or otherwise in respect hereof, against any shareholder, employee, officer or director as such, past, present or future, of the Bank or of any successor corporation, either directly or through the Bank or any successor corporation, whether by virtue of any constitution, statute or rule of law or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issue hereof, expressly waived and released.

The occurrence of any of the following events shall constitute an “Event of Default” with respect to this Senior Note: (i) default in the payment of any interest with respect to this Senior Note when due, which continues for 30 days; (ii) default in the payment of any principal of, or premium, if any, on, this Senior Note when due; (iii) the entry by a court having jurisdiction in the premises of (a) a decree or order for relief in respect of the Bank in an involuntary case or proceeding under any applicable United States federal or state bankruptcy, insolvency, reorganization or other similar law or (b) a decree or order appointing a conservator, receiver, liquidator, assignee, trustee, sequestrator or any other similar official of the Bank, or of substantially all of the property of the Bank, or ordering the winding up or liquidation of the affairs of the Bank, and the continuance of any such decree or order for relief or any such other decree or order unstayed and in effect for a period of 60 consecutive days; or (iv) the commencement by the Bank of a voluntary case or proceeding under any applicable United States federal or state bankruptcy, insolvency, reorganization or other similar law or of any other case or proceeding to be adjudicated as bankrupt or insolvent, or the consent by the Bank to the entry of a decree or order for relief in an involuntary case or proceeding under any applicable United States federal or state bankruptcy, insolvency, reorganization or other similar law or to

the commencement of any bankruptcy or insolvency case or proceeding, or the filing by the Bank of a petition or answer or consent seeking reorganization or relief under any applicable United States federal or state law, or the consent by the Bank to the filing of such petition or to the appointment of or taking possession by a custodian, receiver, liquidator, assignee, trustee, sequestrator or similar official of the Bank or of substantially all of the property of the Bank, or the making by the Bank of an assignment for the benefit of creditors, or the taking of corporate action by the Bank in furtherance of any such action. If an Event of Default shall occur and be continuing, the holder of this Senior Note may declare the principal amount of, and accrued interest and premium, if any, on, this Senior Note due and payable immediately by written notice to the Bank. Upon such declaration and notice, such principal amount, accrued interest and premium, if any, shall become due and payable seven calendar days after such notice. Any Event of Default with respect to this Senior Note may be waived by the holder hereof.

No provision of this Senior Note shall alter or impair the obligation of the Bank, which is absolute and unconditional, to pay the principal, and premium, if any, and interest on, this Senior Note in U.S. dollars at the times, places and rate herein prescribed.

The Bank shall cause to be kept at the corporate trust office of the Senior Note Registrar designated below a register (the register maintained in such corporate trust office or any other office or agency of the Bank in the Place of Payment herein referred to as the “Senior Note Register”) in which, subject to such reasonable regulations as it may prescribe, the Bank shall provide for the registration of the Senior Notes and of transfers of the Senior Notes. The Bank is hereby initially appointed “Senior Note Registrar” for the purposes of registering the Senior Notes and transfers of the Senior Notes as herein provided.

The transfer of this Senior Note is registrable in the Senior Note Register, upon surrender of this Senior Note for registration of transfer at the office or agency of the Bank in the Place of Payment, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Bank and the Paying Agent duly executed by, the holder hereof or his attorney duly authorized in writing, and thereupon one or more new Senior Notes of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees. Notwithstanding the foregoing, the Bank shall not be required to register the transfer of any Senior Note that has been called for redemption during a period beginning at the opening of business fifteen calendar days before the date of mailing of a notice of such redemption and ending at the close of business on the date of such mailing.

No service charge shall be made for any such registration of transfer or exchange, but the Bank may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

The Senior Notes are issuable only in registered form without coupons in minimum denominations of $250,000 and any integral multiple of $1,000 in excess thereof. Each owner of a beneficial interest in this Senior Note is required to hold a beneficial interest in $250,000 principal amount or any integral multiple of $1,000 in excess thereof of this Senior Note at all times.

Prior to due presentment of this Senior Note for registration of transfer, the Bank, the Paying Agent or any agent of the Bank or the Paying Agent may treat the person in whose name this Senior Note is registered as the owner hereof for all purposes, whether or not this Senior Note be overdue, and neither the Bank, the Paying Agent nor any such agent shall be affected by notice to the contrary.

All notices to the Bank under this Senior Note shall be in writing and addressed to the Bank at 50 South LaSalle Street, Chicago, Illinois 60675, or to such other address of the Bank as the Bank may notify the holders of the Senior Notes.

This Senior Note shall be governed by, and construed in accordance with, the laws of the State of Illinois.

IN WITNESS WHEREOF, the Bank has caused this instrument to be duly executed.

	THE NORTHERN TRUST COMPANY
By:
	Authorized Signatory

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of the within Senior Note, shall be construed as though they were written out in full according to applicable laws or regulations.

TEN COM	-	as tenants in common
TEN ENT	-	as tenants by the entireties
JT TEN	-	as joint tenants with right of survivorship and not as tenants in common

UNIF GIFT MIN ACT -		Custodian
	(Cust)		(Minor)
	under Uniform Gifts to Minors Act
	(State)
	Additional abbreviations may also be used though not in the above list.

ASSIGNMENT

FOR VALVE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto

PLEASE INSERT SOCIAL SECURITY NUMBER OR OT} ER IDENTIFYING NUMBER OF ASSIGNEE

(Please print or typewrite name and address,

including postal zip code, of assignee)

the within Senior Note and all rights thereunder, and hereby irrevocably constitutes and appoints

to transfer said Senior Note on the books of the Bank, with full power of substitution in the premises.

Dated:                     

NOTICE: The signature to this assignment must correspond with the name as written upon the face of the within Senior Note in every particular, without alteration or enlargement or any change whatsoever.

OPTION TO ELECT REPAYMENT

The undersigned hereby irrevocably request(s) and instruct(s) the Bank to repay this Senior Note (or portion hereof specified below) pursuant to its terms and at a price equal to 100% of the principal amount hereof to be repaid, together with accrued and unpaid interest hereon, payable to the date of repayment, to the undersigned, at             

(Please print or typewrite name and address of the undersigned)

For this Senior Note to be repaid, the undersigned must give to the Paying Agent at its offices located it 50 South LaSalle Street (Level BB-A), Chicago, Illinois 60675, Attention:

Securities Services, or at such other place or places of which the Bank shall from time to time notify the holders of the Senior Notes, not more than 60 days nor less than 30 days prior to the date of repayment, this Senior Note with this “Option to Elect Repayment” form duly completed.

If less than the entire principal amount of this Senior Note is to be repaid, specify the portion hereof (which shall be increments of $1,000) which the holder elects to have repaid and specify the denomination or denominations (which shall be $250,000 or an integral multiple of $1,000 in excess thereof) of the Senior Notes to be issued to the holder for the portion of this Senior Note not being repaid (in the absence of any such specification, one such Senior Note will be issued for the portion not being repaid):

$                    

Dated:                    

NOTICE: The signature on this “Option to Elect Repayment” form must correspond with the name as written upon the face of the within Senior Note in every particular, without alteration or enlargement or any change whatsoever.

EX-10.(I)

Exhibit (10)(i)

Rev. 8/11

UNLESS THIS SUBORDINATED NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE BANK OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY SUBORDINATED NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

IF THIS SUBORDINATED NOTE IS ISSUED WITH “ORIGINAL ISSUE DISCOUNT” FOR PURPOSES OF SECTION 1273 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED, THE FOLLOWING SHALL BE COMPLETED: THE FOLLOWING INFORMATION IS PROVIDED SOLELY FOR PURPOSES OF APPLYING SECTIONS 1272, 1273 AND 1275 OF THE UNITED STATES INTERNAL REVENUE CODE OF 1986, AS AMENDED, TO THIS SUBORDINATED NOTE. THE ISSUE DATE OF THIS SUBORDINATED NOTE IS                     . THE ISSUE PRICE OF THIS SUBORDINATED NOTE IS         % OF ITS PRINCIPAL AMOUNT. THE AMOUNT OF ORIGINAL ISSUE DISCOUNT ON THIS SUBORDINATED NOTE IS $         PER $1,000 OF THE INITIAL PRINCIPAL AMOUNT, THE YIELD TO MATURITY IS         %, AND THE AMOUNT OF THE ORIGINAL ISSUE DISCOUNT ALLOCABLE TO THE INITIAL SHORT ACCRUAL PERIOD, IF ANY, IS $         PER $1,000 OF THE INITIAL PRINCIPAL AMOUNT, DETERMINED ON THE BASIS OF THE EXACT METHOD.

No. SUB FXR -	REGISTERED
CUSIP NO.:

THE NORTHERN TRUST COMPANY

GLOBAL SUBORDINATED BANK NOTE

(Fixed Rate)

ORIGINAL ISSUE DATE:                       INTEREST RATE:                     % INTEREST PAYMENT DATES:                       INITIAL REDEMPTION DATE:                       ANNUAL REDEMPTION PERCENTAGE REDUCTION:                     ORIGINAL ISSUE DISCOUNT NOTE:                                     Yes:         No:         PRINCIPAL AMOUNT: $                     MATURITY DATE:                       REGULAR RECORD DATES (If other than the April 1 or October 1, prior to each Interest Payment Date):                       INITIAL REDEMPTION PERCENTAGE:   OID AMOUNT:                    

OTHER PROVISIONS:

The Northern Trust Company, an Illinois banking corporation (the “Bank”), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal amount specified on the face hereof in United States Dollars on the Maturity Date specified above and to pay interest thereon from the Original Issue Date specified above or from the most recent interest payment date to which interest on this Subordinated Note (or any predecessor Subordinated Note) has been paid or duly provided for, semi-annually on April 15 and October 15 of each year (unless otherwise specified on the face hereof) (each, an “Interest Payment Date”) and at maturity or upon earlier redemption, if applicable, commencing on the first Interest Payment Date next succeeding the Original Issue Date (or, if the Original Issue Date is between a Regular Record Date and the Interest Payment Date immediately following such Regular Record Date, on the second Interest Payment Date following the Original Issue Date), at the Interest Rate per annum specified above, until the principal hereof is paid or made available for payment, and (to the extent that the payment of such interest shall be legally enforceable) at such Interest Rate on any overdue principal and premium, if any, and on any overdue installment of interest. The interest so payable, and punctually paid or duly provided for, on any Interest Payment Date will be paid to the person in whose name this Subordinated Note (or any predecessor Subordinated Note) is registered at the close of business on the Regular Record Date for such interest, which shall be the April 1 and October 1 (whether or not a Business Day (as defined below)), as the case may be, next preceding the applicable Interest Payment Date (unless

otherwise specified on the face hereof); provided, however, that interest payable at maturity or upon earlier redemption, if applicable, will be payable to the person to whom principal shall be payable. Any such interest not so punctually paid or duly provided for shall forthwith cease to be payable to the holder on such Regular Record Date and may either be paid to the person in whose name this Subordinated Note (or any predecessor Subordinated Note) is registered at the close of business on a special record date for the payment of such defaulted interest (the “Special Record Date”) to be fixed by the Bank, notice of which shall be given to the holders of Subordinated Notes not less than 10 calendar days prior to such Special Record Date, or be paid at any time in any other lawful manner.

Payment of principal of, and premium, if any, and interest on, this Subordinated Note will be made in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts. The Bank will at all times appoint and maintain a paying agent (the “Paying Agent”) authorized by the Bank to pay the principal of, and premium, if any, and interest on, this Subordinated Note on behalf of the Bank and having an office or agency (the “Paying Agent Office”) in The City of New York or the City of Chicago, Illinois (the “Place of Payment”), where this Subordinated Note may be presented or surrendered for payment and where notices, designations or requests in respect of payments with respect to this Subordinated Note may be served. The Bank has initially appointed itself as the Paying Agent, with the Paying Agent Office currently located at 50 South LaSalle Street (Level BB-A), Chicago, Illinois 60675, Attention: Securities Services.

THIS SUBORDINATED NOTE IS A DIRECT, UNCONDITIONAL AND UNSECURED GENERAL OBLIGATION OF THE BANK. THIS SUBORDINATED NOTE IS NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION, IS NOT A DEPOSIT OF, OR GUARANTEED BY, THE BANK, AND IS SUBJECT TO INVESTMENT RISKS, INCLUDING POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED. THIS SUBORDINATED NOTE IS SUBORDINATE TO THE CLAIMS OF DEPOSITORS AND GENERAL CREDITORS OF THE BANK.

Payment of the principal of, and premium, if any, and interest on, this Subordinated Note due at maturity or upon earlier redemption, if applicable, will be made in immediately available funds upon presentation and surrender of this Subordinated Note to the Paying Agent at the Paying Agent Office in the Place of Payment; provided that this Subordinated Note is presented to the Paying Agent in time for the Paying Agent to make such payment in accordance with its normal procedures. Payments of interest on this Subordinated Note (other than at maturity or upon earlier redemption) will be made by wire transfer to such account as has been appropriately designated to the Paying Agent by the person entitled to such payments.

This Subordinated Note is one of a duly authorized issue of Subordinated Bank Notes due from five to fifteen years from date of issue of the Bank (herein called the “Subordinated Notes”).

Payments of interest hereon on any Interest Payment Date will include interest accrued to, but excluding, such Interest Payment Date. Interest hereon shall be computed on the basis of a 360-day year of twelve 30-day months.

If any Interest Payment Date, Maturity Date or date of earlier redemption of this Subordinated Note falls on a day which is not a Business Day, the related payment of principal, premium, if any, or interest shall be made on the next succeeding Business Day with the same force and effect as if made on the date such payment were due, and no interest shall accrue on the amount so payable for the period from and after such Interest Payment Date, Maturity Date or date of earlier redemption, as the case may be. “Business Day” means any day that is not a Saturday or Sunday and that is not a day on which banking institutions in The City of New York or the City of Chicago, Illinois generally are authorized or obligated by law or executive order to close.

The indebtedness of the Bank evidenced by this Subordinated Note, including principal and interest, is unsecured and subordinate and junior in right of payment to the Bank’s obligations to its depositors, its obligations under bankers’ acceptances and letters of credit, and its obligations to its other creditors (including any obligations to any Federal Reserve Bank and the Federal Deposit Insurance Corporation), whether now outstanding or hereafter incurred, other than any obligations which rank on a parity with, or junior to, the Subordinated Notes. In the event of any insolvency proceeding, receivership, conservatorship, reorganization, readjustment of debt, marshalling of assets and liabilities or similar proceedings or any liquidation or winding-up of the Bank, whether voluntary or involuntary, all such obligations (except obligations which rank on a parity with, or junior to, the Subordinated Notes) shall be entitled to be paid in full before any payment shall be made on account of the principal of, or interest on, the Subordinated Notes. In the event of any such proceeding, after payment in full of all sums owing with respect to such prior obligations, the holders of the Subordinated Notes, together with the holders of any obligations of the Bank ranking on a parity with the Subordinated Notes, shall be entitled to be paid, from the remaining assets of the Bank, the unpaid principal of, and the unpaid interest on, the Subordinated Notes or such other obligations before any payment or other distribution, whether in cash, property, or otherwise, shall be made on account of any capital stock or any obligations of the Bank ranking junior to the Subordinated Notes.

The Subordinated Notes shall rank on a parity with (i) the $700,000,000 aggregate principal amount of subordinated indebtedness represented by $200,000,000 aggregate principal amount of 4.60% Subordinated Notes due 2013, $200,000,000 aggregate principal amount of 5.85% Subordinated Notes due 2017, and $300,000,000 aggregate principal amount of 6.50% Subordinated Notes due 2018, (ii) the £150,000,000 aggregate principal amount of 5.375% Subordinated Notes due 2015 that were issued in 2005, (iii) the $200,000,000 aggregate principal amount of floating rate subordinated notes due 2017 issued in 2007 to Northern Trust Corporation, (iv) the $750,000,000 aggregate principal amount of fixed rate senior notes due 2016 issued in 2011 to the Northern Trust Corporation, and (v) such other obligations which may be issued by the Bank which are specifically designated as ranking on a parity with the Subordinated Notes by express provision in the instruments creating or evidencing such obligations.

This Subordinated Note will not be subject to any sinking fund. If so provided on the face of this Subordinated Note and subject to the approval of the Federal Reserve Bank of Chicago, this Subordinated Note may be redeemed by the Bank on and after the Initial Redemption Date, if any, specified on the face hereof. If no Initial Redemption Date is specified on the face hereof, this Subordinated Note may not be redeemed prior to the Maturity Date. On and after the Initial Redemption Date, if any, and subject to the approval of the Federal Reserve Bank of Chicago, this Subordinated Note may be redeemed at any time either in whole or in part from time to time in increments of $1,000 (provided that any remaining principal amount hereof shall be at least $250,000) at the option of the Bank at the applicable Redemption Price (as defined below), together with accrued and unpaid interest hereon at the applicable rate borne by this Subordinated Note to the date of redemption (each such date, a “Redemption Date”), on written notice given not more than 60 nor less than 30 calendar days prior to the Redemption Date by the Bank to the registered holder hereof. Whenever less than all the Subordinated Notes at any time outstanding are to be redeemed, the terms of the Subordinated Notes to be so redeemed shall be selected by the Bank. If less than all the Subordinated Notes with identical terms at any time outstanding are to be redeemed, the Subordinated Notes to be so redeemed shall be selected by the Paying Agent by lot or in any usual manner approved by it. In the event of redemption of this Subordinated Note in part only, a new Subordinated Note for the unredeemed portion hereof shall be issued in the name of the holder hereof upon the surrender hereof.

The “Redemption Price” shall initially be the Initial Redemption Percentage specified on the face hereof of the principal amount of this Subordinated Note to be redeemed and shall decline at each anniversary of the Initial Redemption Date specified on the face hereof by the Annual Redemption Percentage Reduction, if any, specified on the face hereof, of the principal amount to be redeemed until the Redemption Price is 100% of such principal amount.

This Subordinated Note will not be repayable at the option of the holder hereof prior to maturity.

If this Subordinated Note is an Original Issue Discount Note and if an Event of Default with respect to this Subordinated Note shall have occurred and be continuing, the Default Amount (as defined hereafter) of this Subordinated Note may be declared due and payable in the manner and with the effect provided herein. The “Default Amount” shall be equal to the adjusted issue price as of the first day of the accrual period as determined under Treasury Regulation Section 1.1275-1(b) (or successor regulation) under the United States Internal Revenue Code of 1986, as amended, in which the date of acceleration occurs increased by the daily portion of the original issue discount for each day in such accrual period ending on the date of acceleration, as determined under Treasury Regulation Section 1.1275-1(b) (or successor regulation) under the United States Internal Revenue Code of 1986, as amended. Upon payment of (i) the amount of principal or premium, if any, so declared due and payable and (ii) interest on

any overdue principal and overdue interest or premium, if any, (in each case to the extent that the payment of such interest shall be legally enforceable), all of the Bank’s obligations in respect of the payment of the principal of, and interest or premium, if any, on, this Subordinated Note shall terminate.

In case any Subordinated Note shall at any time become mutilated, destroyed, lost or stolen and such Subordinated Note or evidence satisfactory to the Bank of the loss, theft or destruction thereof (together with indemnity satisfactory to the Bank and such other documents or proof as may be required in the premises) shall be delivered to the Bank, a new Subordinated Note of like tenor will be issued by the Bank in exchange for the Subordinated Note so mutilated, or in lieu of the Subordinated Note so destroyed or lost or stolen. All expenses and reasonable charges associated with procuring the indemnity referred to above and with the preparation, authentication and delivery of a new Subordinated Note shall be borne by the holder of the Subordinated Note so mutilated, destroyed, lost or stolen. If any Subordinated Note which has matured or is about to mature shall become mutilated, destroyed, lost or stolen, the Bank may, instead of issuing a substitute Subordinated Note, pay or authorize the payment of the same (without surrender thereof except in the case of a mutilated Subordinated Note) upon compliance by the holder thereof with the provisions of this paragraph.

No recourse shall be had for the payment of the principal of, premium, if any, or interest on, this Subordinated Note, for any claim based hereon, or otherwise in respect hereof, against any shareholder, employee, officer or director, as such, past, present or future, of the Bank or of any successor corporation, either directly or through the Bank or any successor corporation, whether by virtue of any constitution, statute or rule of law or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and part of the consideration for the issue hereof, expressly waived and released.

An “Event of Default” with respect to this Subordinated Note will occur if the Bank shall consent to, or a court or other governmental agency shall enter a decree or order for, the appointment of a receiver or other similar official in any liquidation, insolvency or similar proceeding with respect to the Bank or all or substantially all of its property and, in the case of a decree or order, such decree or order shall have remained in force for a period of 60 days. If an Event of Default shall occur and be continuing, the holder of this Subordinated Note may declare the principal amount of, and accrued interest and premium, if any, on, this Subordinated Note due and payable immediately by written notice to the Bank. Upon such declaration and notice, such principal amount, accrued interest and premium, if any, shall become due and payable seven calendar days after such notice. Any Event of Default with respect to this Subordinated Note may be waived by the holder hereof. No payment may be made on this Subordinated Note in the event of acceleration resulting from an Event of Default without the prior written consent of the Federal Reserve Bank of Chicago. There is no right of acceleration in the case of a default in the payment of principal of, or interest on, this Subordinated Note or in the performance of any other obligation of the Bank under this Subordinated Note or under any other security issued by the Bank.

No provision of this Subordinated Note shall alter or impair the obligation of the Bank, which is absolute and unconditional, to pay the principal of, and premium, if any, and interest on, this Subordinated Note in U.S. dollars at the times, places and rate herein prescribed.

The Bank shall cause to be kept at the corporate trust office of the Subordinated Note Registrar designated below a register (the register maintained in such corporate trust office or any other office or agency of the Bank in the Place of Payment herein referred to as the “Subordinated Note Register”) in which, subject to such reasonable regulations as it may prescribe, the Bank shall provide for the registration of the Subordinated Notes and of transfers of the Subordinated Notes. The Bank is hereby initially appointed “Subordinated Note Registrar” for the purpose of registering the Subordinated Notes and transfers of the Subordinated Notes as herein provided.

The transfer of this Subordinated Note is registrable in the Subordinated Note Register, upon surrender of this Subordinated Note for registration of transfer at the office or agency of the Bank in the Place of Payment, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Bank and the Paying Agent duly executed by, the holder hereof or his attorney duly authorized in writing, and thereupon one or more new Subordinated Notes of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees. Notwithstanding the foregoing, the Bank shall not be required to register the transfer of any Subordinated Note that has been called for redemption during a period beginning at the opening of business fifteen calendar days before the day of mailing of a notice of such redemption and ending at the close of business on the day of such mailing. Bank may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

The Subordinated Notes are issuable only in registered form without coupons in minimum denominations of $250,000 and any integral multiple of $1,000 in excess thereof. Each owner of a beneficial interest in this Subordinated Note is required to hold a beneficial interest in $250,000 principal amount or any integral multiple of $1,000 in excess thereof of this Subordinated Note at all times.

Prior to due presentment of this Subordinated Note for registration of transfer, the Bank, the Paying Agent or any agent of the Bank or the Paying Agent may treat the person in whose name this Subordinated Note is registered as the owner hereof for all purposes, whether or not this Subordinated Note be overdue, and neither the Bank, the Paying Agent nor any such agent shall be affected by notice to the contrary.

All notices to the Bank under this Subordinated Note shall be in writing and addressed to the Bank at 50 South LaSalle Street (Level BB-A), Chicago, Illinois 60675, Attention: Securities Services, or to such other address of the Bank as the Bank may notify the holders of the Subordinated Notes.

This Subordinated Note shall be governed by, and construed in accordance with, the laws of the State of Illinois.

IN WITNESS WHEREOF, the Bank has caused this instrument to be duly executed.

THE NORTHERN TRUST COMPANY

By:

Authorized Signatory

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of the within Subordinated Note, shall be construed as though they were written out in full according to applicable laws or regulations.

TEN COM	-	as tenants in common
TEN ENT	-	as tenants by the entireties
JT TEN	-	as joint tenants with right of survivorship and not as tenants in common

UNIF GIFT MIN ACT -		Custodian
	(Cust)		(Minor)
		under Uniform Gifts to Minors Act
		(State)

Additional abbreviations may also be used

though not in the above list.

ASSIGNMENT

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto

PLEASE INSERT SOCIAL SECURITY NUMBER OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

(Please print or typewrite name and address,

including postal zip code, of assignee)

the within Subordinated Note and all rights thereunder, and hereby irrevocably constitutes and appoints                     to transfer said Subordinated Note on the books of the Bank, with full power of substitution in the premises.

Dated:                    

Notice: The signature to this assignment must correspond with the name as written upon the face of the within Subordinated Note in every particular, without alteration or enlargement or any change whatsoever.

10

EX-10.(II)

Exhibit (10)(ii)

Rev. 8/11

UNLESS THIS SUBORDINATED NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE BANK OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY SUBORDINATED NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

IF THIS SUBORDINATED NOTE IS ISSUED WITH “ORIGINAL ISSUE DISCOUNT” FOR PURPOSES OF SECTION 1273 OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED, THE FOLLOWING SHALL BE COMPLETED: THE FOLLOWING INFORMATION IS PROVIDED SOLELY FOR PURPOSES OF APPLYING SECTIONS 1272, 1273 AND 1275 OF THE UNITED STATES INTERNAL REVENUE CODE OF 1986, AS AMENDED, TO THIS SUBORDINATED NOTE. THE ISSUE DATE OF THIS SUBORDINATED NOTE IS             . THE ISSUE PRICE OF THIS SUBORDINATED NOTE IS             % OF ITS PRINCIPAL AMOUNT. THE AMOUNT OF ORIGINAL ISSUE DISCOUNT ON THIS SUBORDINATED NOTE IS $             PER $1,000 OF THE INITIAL PRINCIPAL AMOUNT, THE YIELD TO MATURITY IS             %, AND THE AMOUNT OF THE ORIGINAL ISSUE DISCOUNT ALLOCABLE TO THE INITIAL SHORT ACCRUAL PERIOD, IF ANY, IS $             PER $1,000 OF THE INITIAL PRINCIPAL AMOUNT, DETERMINED ON THE BASIS OF THE EXACT METHOD.

No. SUB FLR -	REGISTERED
CUSIP NO.:

THE NORTHERN TRUST COMPANY

GLOBAL SUBORDINATED BANK NOTE

(Floating Rate)

ORIGINAL ISSUE DATE:	PRINCIPAL AMOUNT:
INITIAL BASE RATE:                      %	MATURITY DATE:
INTEREST RATE BASIS:	INDEX MATURITY:
SPREAD AND/OR SPREAD MULTIPLIER:	REGULAR RECORD DATES (If other than the 15th day prior to each Interest Payment Date):

MAXIMUM INTEREST RATE:                      %	MINIMUM INTEREST RATE:                      %
INTEREST PAYMENT DATES:	INTEREST PAYMENT PERIOD:
INTEREST RESET DATES:	INTEREST RESET PERIOD:
INITIAL REDEMPTION DATE:                     INITIAL REDEMPTION PERCENTAGE:                      % ORIGINAL ISSUE DISCOUNT NOTE:                 Yes:              No:             OTHER PROVISIONS:	ANNUAL REDEMPTION PERCENTAGE REDUCTION:                      OID AMOUNT:                     CALCULATION AGENT:                     ALTERNATE RATE EVENT SPREAD:

The Northern Trust Company, an Illinois banking corporation (the “Bank”), for value received, hereby promises to pay to Cede & Co., or registered assigns, the principal amount specified on the face hereof in United States Dollars on the Maturity Date specified above and to pay interest thereon from the Original Issue Date specified above or from the most recent interest payment date (or, if the Interest Reset Period specified above is daily or weekly, from, and including, the day following the most recent Regular Record Date) to which interest on this Subordinated Note (or any predecessor Subordinated Note) has been paid or made available for payment (each, an “Interest Payment Date”), on the Interest Payment Dates specified above and at maturity or upon earlier redemption, if applicable, commencing on the first Interest Payment Date next succeeding the Original Issue Date (or, if the Original Issue Date is between a Regular Record Date and the Interest Payment Date immediately following such Regular Record Date, on the second Interest Payment Date following the Original Issue Date), at a rate per annum equal to the Initial Base Rate specified above, as adjusted by the addition or subtraction of the Spread, if any, specified above and/or by the multiplication by the Spread Multiplier, if any, specified above, until the first Interest Reset Date following the Original Issue Date and, on and after such Interest Reset Date, at the rate determined in accordance with the provisions set forth herein, until the principal hereof is paid or made available for payment, and (to the extent that the payment of such interest shall be legally enforceable) at the last rate in effect prior to any payment default on any overdue principal and premium, if any, and on any overdue installment of interest. The interest so payable, and punctually paid or made available for payment, on any Interest Payment Date will be paid to the person in whose name this Subordinated Note (or any predecessor Subordinated Note) is registered at the close of business on the Regular Record Date for such interest, which shall be the 15th calendar day (whether or not a Business Day (as defined below)) before such Interest Payment Date (unless otherwise

specified on the face hereof); provided, however, that interest payable at maturity or upon earlier redemption, if applicable, will be payable to the person to whom principal shall be payable.

Payment of principal of, and premium, if any, and interest on, this Subordinated Note will be made in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts. The Bank will at all times appoint and maintain a paying agent (the “Paying Agent”) authorized by the Bank to pay the principal of, and premium, if any, and interest on, this Subordinated Note on behalf of the Bank and having an office or agency (the “Paying Agent Office”) in The City of New York or the City of Chicago, Illinois (the “Place of Payment”), where this Subordinated Note may be presented or surrendered for payment and where notices, designations or requests in respect of payments with respect to this Subordinated Note may be served. The Bank has initially appointed itself as such Paying Agent, with the Paying Agent Office currently located at 50 South LaSalle Street (Level BB-A), Chicago, Illinois 60675, Attention: Securities Services.

THIS SUBORDINATED NOTE IS A DIRECT, UNCONDITIONAL AND UNSECURED GENERAL OBLIGATION OF THE BANK. THIS SUBORDINATED NOTE IS NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION, IS NOT A DEPOSIT OF, OR GUARANTEED BY, THE BANK, AND IS SUBJECT TO INVESTMENT RISKS, INCLUDING POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED. THIS SUBORDINATED NOTE IS SUBORDINATE TO THE CLAIMS OF DEPOSITORS AND GENERAL CREDITORS OF THE BANK.

Payment of the principal of, and premium, if any, and interest on, this Subordinated Note due at maturity or upon earlier redemption, if applicable, will be made in immediately available funds upon presentation and surrender of this Subordinated Note to the Paying Agent at the Paying Agent Office in the Place of Payment; provided that this Subordinated Note is presented to the Paying Agent in time for the Paying Agent to make such payment in accordance with its normal procedures. Payments of interest on this Subordinated Note (other than at maturity or upon earlier redemption) will be made by wire transfer to such account as has been appropriately designated to the Paying Agent by the person entitled to such payments.

This Subordinated Note is one of a duly authorized issue of Subordinated Bank Notes due from five to fifteen years from date of issue of the Bank (herein called the “Subordinated Notes”).

Unless otherwise indicated on the face hereof, if the rate of interest on this Subordinated Note resets daily, weekly or monthly, the Interest Payment Date for this Subordinated Note will be the third Wednesday of each month or the third Wednesday of March, June, September and December of each year; if the rate of interest on this Subordinated Note resets quarterly, the Interest Payment Date for this Subordinated Note will be the third Wednesday of March, June, September and December of each year; if the rate of interest on this

Subordinated Note resets semi-annually, the Interest Payment Date for this Subordinated Note will be the third Wednesday of each of two months of each year specified on the face hereof that are six months apart; and if the rate of interest on this Subordinated Note resets annually, the Interest Payment Date for this Subordinated Note will be the third Wednesday of the month specified on the face hereof. If any Interest Payment Date (unless it is also the Maturity Date) for this Subordinated Note falls on a day that is not a Business Day, such Interest Payment Date will be postponed to the next succeeding Business Day; provided, however, that, if the Interest Rate Basis specified on the face hereof is LIBOR and such next succeeding Business Day is in the next succeeding calendar month, such Interest Payment Date (unless it is also the Maturity Date) will be the immediately preceding Business Day. If any Maturity Date or date of earlier redemption or repayment of this Subordinated Note falls on a day that is not a Business Day, the related payment of interest shall be made on the next succeeding Business Day with the same force and effect as if made on the date such payment were due, and no interest shall accrue on the amount so payable for the period from and after such Maturity Date or date of earlier redemption or repayment. “Business Day” means any day other than a Saturday, Sunday or a day on which banking institutions in The City of New York or the City of Chicago, Illinois generally are authorized or obligated by law or executive order to close, and with respect to Subordinated Notes with respect to which the Interest Rate Basis specified on the face hereof is LIBOR, any day on which dealings in U.S. dollars are transacted in the London interbank market (a “London Business Day”).

The indebtedness of the Bank evidenced by this Subordinated Note, including principal and interest, is unsecured and subordinate and junior in right of payment to the Bank’s obligations to its depositors, its obligations under bankers’ acceptances and letters of credit, and its obligations to its other creditors (including any obligations to any Federal Reserve Bank and the Federal Deposit Insurance Corporation), whether now outstanding or hereafter incurred, other than any obligations which rank on a parity with, or junior to, the Subordinated Notes. In the event of any insolvency proceeding, receivership, conservatorship, reorganization, readjustment of debt, marshalling of assets and liabilities or similar proceedings or any liquidation or winding-up of the Bank, whether voluntary or involuntary, all such obligations (except obligations which rank on a parity with, or junior to, the Subordinated Notes) shall be entitled to be paid in full before any payment shall be made on account of the principal of, or interest on, the Subordinated Notes. In the event of any such proceeding, after payment in full of all sums owing with respect to such prior obligations, the holders of the Subordinated Notes, together with the holders of any obligations of the Bank ranking on a parity with the Subordinated Notes, shall be entitled to be paid, from the remaining assets of the Bank, the unpaid principal of, and the unpaid interest on, the Subordinated Notes or such other obligations before any payment or other distribution, whether in cash, property, or otherwise, shall be made on account of any capital stock or any obligations of the Bank ranking junior to the Subordinated Notes.

The Subordinated Notes shall rank on a parity with (i) the $700,000,000 aggregate principal amount of subordinated indebtedness represented by $200,000,000 aggregate principal amount of 4.60% Subordinated Notes due 2013, $200,000,000 aggregate principal amount of 5.85% Subordinated Notes due 2017, and $300,000,000 aggregate principal amount of 6.50%

Subordinated Notes due 2018, (ii) the £150,000,000 aggregate principal amount of 5.375% Subordinated Notes due 2015 that were issued in 2005, (iii) the $200,000,000 aggregate principal amount of floating rate subordinated notes due 2017 issued in 2007 to Northern Trust Corporation, (iv) the $750,000,000 aggregate principal amount of fixed rate senior notes due 2016 issued in 2011 to the Northern Trust Corporation, and (v) such other obligations which may be issued by the Bank which are specifically designated as ranking on a parity with the Subordinated Notes by express provision in the instruments creating or evidencing such obligations.

This Subordinated Note will not be subject to any sinking fund. If so provided on the face of this Subordinated Note and subject to the approval of the Federal Reserve Bank of Chicago, this Subordinated Note may be redeemed by the Bank on and after the Initial Redemption Date, if any, specified on the face hereof. If no Initial Redemption Date is specified on the face hereof, this Subordinated Note may not be redeemed prior to the Maturity Date. On and after the Initial Redemption Date, if any, and subject to the approval of the Federal Reserve Bank of Chicago, this Subordinated Note may be redeemed at any time either in whole or in part from time to time in increments of $1,000 (provided that any remaining principal amount hereof shall be at least $250,000) at the option of the Bank at the applicable Redemption Price (as defined below), together with accrued and unpaid interest hereon at the applicable rate borne by this Subordinated Note to the date of redemption (each such date, a “Redemption Date”), on written notice given not more than 60 nor less than 30 calendar days prior to the Redemption Date by the Bank to the registered holder hereof. Whenever less than all the Subordinated Notes at any time outstanding are to be redeemed, the terms of the Subordinated Notes to be so redeemed shall be selected by the Bank. If less than all the Subordinated Notes with identical terms at any time outstanding are to be redeemed, the Subordinated Notes to be so redeemed shall be selected by the Paying Agent by lot or in any usual manner approved by it. In the event of redemption of this Subordinated Note in part only, a new Subordinated Note for the unredeemed portion hereof shall be issued in the name of the holder hereof upon the surrender hereof.

The “Redemption Price” shall initially be the Initial Redemption Percentage specified on the face hereof of the principal amount of this Subordinated Note to be redeemed and shall decline at each anniversary of the Initial Redemption Date specified on the face hereof by the Annual Redemption Percentage Reduction, if any, specified on the face hereof, of the principal amount to be redeemed until the Redemption Price is 100% of such principal amount.

This Subordinated Note will not be repayable at the option of the holder hereof prior to maturity.

The rate of interest on this Subordinated Note will be reset daily, weekly, monthly, quarterly, semi-annually or annually (each such period, an “Interest Reset Period” for this Subordinated Note, and the first calendar day of an Interest Reset Period, an “Interest Reset Date”), as specified on the face hereof. Unless otherwise indicated on the face hereof, if this Subordinated Note resets daily, the Interest Reset Date will be each Business Day; if this

Subordinated Note resets weekly and the Interest Rate Basis is not the Treasury Rate, the Interest Reset Date will be the Wednesday of each week; if this Subordinated Note resets weekly and the Interest Rate Basis is the Treasury Rate, the Interest Reset Date will be the Tuesday of each week (except as provided below); if this Subordinated Note resets monthly, the Interest Reset Date will be the third Wednesday of each month; if this Subordinated Note resets quarterly, the Interest Reset Date will be the third Wednesday of March, June, September and December; if this Subordinated Note resets semi-annually, the Interest Reset Date will be the third Wednesday of each of two months of each year which are six months apart, as specified on the face hereof; and if this Subordinated Note resets annually, the Interest Reset Date will be the third Wednesday of one month of each year, as specified on the face hereof; provided, however, that the base rate in effect from the Original Issue Date to the first Interest Reset Date will be the Initial Base Rate specified on the face hereof. If any Interest Reset Date with respect to this Subordinated Note would otherwise be a day that is not a Business Day, such Interest Reset Date will be the next succeeding Business Day, except that in the case that the Interest Rate Basis specified on the face hereof is LIBOR, if such Business Day is in the next succeeding calendar month, such Interest Reset Date will be the immediately preceding Business Day.

All calculations relating to this Subordinated Note will be made by the “Calculation Agent.” The Bank will serve as Calculation Agent for this Subordinated Note as of its Original Issue Date, unless otherwise specified on the face hereof. The Bank may appoint a different institution to serve as Calculation Agent from time to time after the Original Issue Date of this Subordinated Note without the consent of the holder and without notice.

The Calculation Agent will determine the interest rate that takes effect on an Interest Reset Date by reference to the Interest Determination Date. Unless otherwise specified on the face hereof, (i) if the Interest Rate Basis is not LIBOR or the Treasury Rate, the Interest Determination Date will be the second Business Day before the Interest Reset Date; (ii) if the Interest Rate Basis is LIBOR, the Interest Determination Date will be the second London Business Day (as defined below) preceding the Interest Reset Date; and (iii) if the Interest Rate Basis is the Treasury Rate, the Interest Determination Date will be the day of the week in which the Interest Reset Date falls on which treasury bills — i.e., direct obligations of the U.S. government — would normally be auctioned. Treasury bills are usually sold at auction on the Monday of each week, unless that day is a legal holiday, in which case the auction is usually held on the following Tuesday but may be held on the preceding Friday. If as the result of a legal holiday an auction is held on the preceding Friday, that Friday will be the Treasury Interest Determination Date relating to the Interest Reset Date occurring in the next succeeding week. If the auction is held on a day that would otherwise be an Interest Reset Date, then the Interest Reset Date will instead be the first Business Day following the auction date.

Unless the Interest Rate is LIBOR, the Calculation Agent will calculate the interest rate that takes effect on a particular Interest Reset Date no later than the corresponding Interest Calculation Date. The Interest Calculation Date will be the earlier of (i) the tenth calendar day after the Interest Determination Date or, if that tenth calendar day is not a Business Day, the next succeeding Business Day, and (ii) the Business Day immediately preceding the

Interest Payment Date or the Maturity Date on which the next payment of interest will be due. The Calculation Agent need not wait until the relevant Interest Calculation Date to determine the interest rate if the rate information it needs to make the determination is available from the relevant sources sooner.

For each Interest Reset Period, the Calculation Agent will calculate the amount of accrued interest by multiplying the face amount of this Subordinated Note by an accrued interest factor for the Interest Reset Period. This factor will equal the sum of the interest factors calculated for each day during the Interest Reset Period. The interest factor for each day will be expressed as a decimal and will be calculated by dividing the interest rate (also expressed as a decimal) applicable to that day (i) by 360, if the Interest Rate Basis is the Commercial Paper Rate, the Prime Rate, LIBOR, the CD Rate or the Federal Funds Rate, or (ii) by the actual number of days in the year, if the Interest Rate Basis is the Treasury Rate or the CMT Rate.

Upon the request of the holder of this Subordinated Note, the Calculation Agent will provide such holder with the interest rate then in effect for this Subordinated Note and, if determined, the interest rate that will become effective on the next Interest Reset Date. The Calculation Agent’s determination of any interest rate, and its calculation of the amount of interest for any Interest Reset Period, will be final and binding in the absence of manifest error.

All percentages resulting from any calculation relating to this Subordinated Note will be rounded upward or downward, as appropriate, to the next higher or lower one hundred-thousandth of a percentage point. For example, 9.876541% (or .09876541) would be rounded down to 9.87654% (or .0987654) and 9.876545% (or .09876545) would be rounded up to 9.87655% (or .0987655). All amounts used in or resulting from any calculation relating to this Subordinated Note will be rounded upward or downward, as appropriate, to the nearest cent, with one-half cent or more being rounded upward.

In determining the Base Rate that applies this Subordinated Note during a particular Interest Reset Period, the Calculation Agent may obtain rate quotes from various banks or dealers active in the relevant market, as described in the following subsections. Those reference banks and dealers may include the Calculation Agent itself, including the Bank, and its affiliates.

Except as otherwise provided herein, the rate of interest on this Subordinated Note for each Interest Reset Date will be the rate determined in accordance with the provisions set forth under the applicable heading below corresponding to the Interest Rate Basis specified on the face hereof. Notwithstanding the foregoing, the interest rate hereon shall not be greater than the Maximum Interest Rate, if any, specified on the face hereof and shall not be lower than the Minimum Interest Rate, if any, specified on the face hereof. In addition, the interest rate hereon will in no event be greater than the maximum rate permitted by Illinois law, as the same may be modified by United States law of general application.

Commercial Paper Rate. If the Interest Rate Basis of this Subordinated Note is the Commercial Paper Rate, this Subordinated Note will bear interest at a Base Rate equal to the Commercial Paper Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The Commercial Paper Rate will be the Money Market Yield (as defined below) of the rate, for the relevant Interest Determination Date, for commercial paper having the Index Maturity (as defined below) specified on the face of this Subordinated Note, as published in H.15(519) (as defined below) under the heading “Commercial Paper — Nonfinancial.” If the Commercial Paper Rate cannot be determined as described above, the following procedures will apply:

(i) If the rate described above does not appear in H.15(519) at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), then the Commercial Paper Rate will be the rate, for the relevant Interest Determination Date, for commercial paper having the Index Maturity specified on the face of this Subordinated Note, as published in H.15 Daily Update (as defined below) or another recognized electronic source used for displaying that rate, under the heading “Commercial Paper —Nonfinancial.”

(ii) If the rate described above does not appear in H.15(519), H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), the Commercial Paper Rate will be the Money Market Yield of the arithmetic mean of the offered rates, as of 11:00 AM., New York City time, on the relevant Interest Determination Date, by three leading U.S. dollar commercial paper dealers in New York City selected by the Calculation Agent for U.S. dollar commercial paper that has the relevant Index Maturity and is placed for an industrial issuer whose bond rating is “AA”, or the equivalent, from a nationally recognized rating agency.

(iii) If fewer than three dealers selected by the Calculation Agent are quoting as described above, the Commercial Paper Rate for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

LIBOR. If the Interest Rate Basis of this Subordinated Note is LIBOR, this Subordinated Note will bear interest at a Base Rate equal to LIBOR, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof. LIBOR will be the London interbank offered rate for deposits of U.S. dollars. LIBOR will be determined in the following manner

(i) LIBOR will be the offered rate appearing on the Reuters Screen LIBOR01 Page (as defined below) as of 11:00 A.M., London time, on the relevant LIBOR Interest Determination Date, for deposits of U.S. dollars having the relevant Index Maturity beginning on the relevant Interest Reset Date

(ii) If no rate appears on the Reuters Screen LIBOR01 Page, then LIBOR will be determined on the basis of the rates, at approximately 11:00 A.M., London time, on the relevant LIBOR Interest Determination Date, for deposits of U.S. dollars having the relevant Index Maturity, beginning on the relevant Interest Reset Date and in a Representative Amount (as defined below), are offered to prime banks in the London interbank market by four major banks in that market selected by the Calculation Agent. The Calculation Agent will request the principal London office of each of these banks to provide a quotation of its rate. If at least two quotations are provided, LIBOR for the relevant LIBOR Interest Determination Date will be the arithmetic mean of the quotations.

(iii) If fewer than two quotations are provided as described above, LIBOR for the relevant LIBOR Interest Determination Date will be the arithmetic mean of the rates for loans of U.S. dollars having the relevant Index Maturity, beginning on the relevant Interest Reset Date and in a Representative Amount to leading European banks quoted, at approximately 11:00 A.M., New York City time, on that LIBOR Interest Determination Date, by three major banks in New York City selected by the Calculation Agent.

(iv) If fewer than three banks selected by the Calculation Agent are quoting as described above, LIBOR for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

Treasury Rate. If the Interest Rate Basis of this Subordinated Note is the Treasury Rate, this Subordinated Note will bear interest at a Base Rate equal to the Treasury Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The Treasury Rate will be the rate for the auction, on the relevant Treasury Interest Determination Date, of treasury bills having the Index Maturity specified in the on the face of this Subordinated Note, as that rate appears on Reuters Screen USAUCTION10 or USAUCTION11 under the heading “Investment Rate.” If the Treasury Rate cannot be determined in this manner, the following procedures will apply:

(i) If the rate described above does not appear on either page at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), the Treasury Rate will be the Bond Equivalent Yield (as defined below) of the rate, for the relevant Interest Determination Date, for the type of treasury bill described above, as published in H.15 Daily Update or another recognized electronic source used for displaying that rate, under the heading “U.S. Government Securities/Treasury Bills/Secondary Market.”

(ii) If the rate described in the prior paragraph does not appear in H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), the Treasury Rate will be the Bond Equivalent Yield of the auction rate, for the relevant Treasury Interest Determination Date and for treasury bills of the kind described above, as announced by the U.S. Department of the Treasury.

(iii) If the auction rate described in the prior paragraph is not so announced by 3:00 P.M., New York City time, on the relevant Interest Calculation Date, or if no such auction is held for the relevant week, then the Treasury Rate will be the Bond Equivalent Yield of the rate, for the relevant Treasury Interest Determination Date and for treasury bills having a remaining maturity closest to the specified Index Maturity, as published in H.15(519) under the heading “U.S. Government Securities/Treasury Bills/Secondary Market.”

(iv) If the rate described in the prior paragraph does not appear in H.15(519) at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), then the Treasury Rate will be the rate, for the relevant Treasury Interest Determination Date and for treasury bills having a remaining maturity closest to the specified Index Maturity, as published in H.15 Daily Update or another recognized electronic source used for displaying that rate, under the heading “U.S. Government Securities/Treasury Bills/Secondary Market.”

(v) If the rate described in the prior paragraph does not appear in H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), the Treasury Rate will be the Bond Equivalent Yield of the arithmetic mean of the secondary market bid rates as of approximately 3:30 P.M., New York City time, on the relevant Treasury Interest Determination Date, of three primary U.S. government securities dealers in New York City selected by the Calculation Agent for the issue of treasury bills with a remaining maturity closest to the specified Index Maturity.

(vi) If fewer than three dealers selected by the Calculation Agent are quoting as described in the prior paragraph, the Treasury Rate in effect for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

CMT Rate. If the Interest Rate Basis of this Subordinated Note is the CMT Rate, this Subordinated Note will bear interest at a Base Rate equal to the CMT Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The CMT Rate will be the rate displayed on the Designated CMT Reuters Screen Page (as defined below) under the heading “. . Treasury Constant Maturities . . . Federal Reserve Board Release H.15 . . . Mondays Approximately 3:45 P.M.,” under the column for the Designated CMT Index Maturity (as defined below), as follows: (a) if the Designated CMT Reuters Screen Page is Reuters Screen FRBCMT page, the rate for the relevant Interest Determination Date, or (b) if the Designated CMT Reuters Screen Page is Reuters Screen FEDCMT page, the weekly or monthly average, as specified on the face of this Subordinated Note, for the week that ends immediately before the week in which the relevant Interest

Determination Date falls, or for the month that ends immediately before the month in which the relevant Interest Determination Date falls, as applicable. If the CMT Rate cannot be determined in this manner, the following procedures will apply:

(i) If the applicable rate described above is not displayed on the relevant Designated CMT Reuters Screen Page at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), then the CMT Rate will be the applicable treasury constant maturity rate described above — that is, for the Designated CMT Index Maturity and for either the relevant Interest Determination Date or the weekly or monthly average, as applicable — as published in H.15(519).

(ii) If the applicable rate described above does not appear in H.15(519) at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), then the CMT Rate will be the treasury constant maturity rate, or other U.S. treasury rate, for the Designated CMT Index Maturity and with reference to the relevant Interest Determination Date, that (a) is published by the Board of Governors of the Federal Reserve System, or the U.S. Department of the Treasury, and (b) is determined by the Calculation Agent to be comparable to the applicable rate formerly displayed on the Designated CMT Reuters Screen Page and published in H.15(519).

(iii) If the rate described in the prior paragraph does not appear at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), then the CMT Rate will be the yield to maturity of the arithmetic mean of the offered rates, as of approximately 3:30 P.M., New York City time, on the relevant Interest Determination Date, of three primary U.S. government securities dealers in New York City selected by the Calculation Agent for the most recently issued treasury notes having an original maturity of approximately the Designated CMT Index Maturity and a remaining term to maturity of not less than the Designated CMT Index Maturity minus one year, and in a Representative Amount. In selecting these offered rates, the Calculation Agent will request quotations from five of these primary dealers and will disregard the highest quotation — or, if there is equality, one of the highest — and the lowest quotation — or, if there is equality, one of the lowest. Treasury notes are direct, non-callable, fixed rate obligations of the U.S. government.

(iv) If the Calculation Agent is unable to obtain three quotations of the kind described in the prior paragraph, the CMT rate will be the yield to maturity of the arithmetic mean of the offered rates, as of approximately 3:30 P.M., New York City time, on the relevant Interest Determination Date, of three primary U.S. government securities dealers in New York City selected by the Calculation Agent for treasury notes with an original maturity longer than the Designated CMT Index Maturity, with a remaining term to maturity closest to the Designated CMT Index Maturity and in a Representative Amount. In selecting these offered rates, the Calculation Agent will request quotations from five of these primary dealers and will disregard the highest quotation — or, if there

is equality, one of the highest — and the lowest quotation — or, if there is equality, one of the lowest. If two treasury notes with an original maturity longer than the Designated CMT Index Maturity have remaining terms to maturity that are equally close to the Designated CMT Index Maturity, the Calculation Agent will obtain quotations for the treasury note with the shorter remaining term to maturity.

(v) If fewer than five but more than two of these primary dealers are quoting as described in the prior paragraph, then the CMT Rate for the relevant Interest Determination Date will be based on the arithmetic mean of the offered rates so obtained, and neither the highest nor the lowest of those quotations will be disregarded.

(vi) If two or fewer primary dealers selected by the Calculation Agent are quoting as described above, the CMT Rate in effect for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

CD Rate. If the Interest Rate Basis of this Subordinated Note is the CD Rate, this Subordinated Note will bear interest at a Base Rate equal to the CD Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The CD Rate will be the rate, on the relevant Interest Determination Date, for negotiable U.S. dollar certificates of deposit having the Index Maturity specified on the face of this Subordinated Note, as published in H.15(519) under the heading “CDs (Secondary Market).” If the CD Rate cannot be determined in this manner, the following procedures will apply:

(i) If the rate described above does not appear in H15(519) at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), then the CD Rate will be the rate, for the relevant Interest Determination Date, described above as published in H.15 Daily Update or another recognized electronic source used for displaying that rate, under the heading “CDs (Secondary Market).”

(ii) If the rate described above does not appear in H.15(519), H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), the CD Rate will be the arithmetic mean of the rates offered as of 10:00 A.M., New York City time, on the relevant Interest Determination Date, by three leading nonbank dealers in negotiable U.S. dollar certificates of deposit in New York City, as selected by the Calculation Agent for negotiable U.S. dollar certificates of deposit of major U.S. money center banks with a remaining maturity closest to the specified Index Maturity, and in a Representative Amount.

(iii) If fewer than three dealers selected by the Calculation Agent are quoting as described above, the CD Rate in effect for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

Federal Funds Rate. If the Interest Rate Basis of this Subordinated Note is the Federal Funds Rate, this Subordinated Note will bear interest at a Base Rate equal to the Federal Funds Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The Federal Funds Rate will be the rate for U.S. dollar federal funds on the relevant Interest Determination Date, as published in H.15(519) under the heading “Federal Funds (Effective),” as that rate is displayed on Reuters Screen FEDFUNDS1 Page. If the Federal Funds Rate cannot be determined in this manner, the following procedures will apply:

(i) If the rate described above is not displayed on Reuters Screen FEDFUNDS1 Page at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), then the Federal Funds Rate, for the relevant Interest Determination Date, will be the rate described above as published in H.15 Daily Update or another recognized electronic source used for displaying that rate, under the heading “Federal Funds (Effective).”

(ii) If the rate described above is not displayed on Reuters Screen FEDFUNDS1 Page and does not appear in H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), the Federal Funds Rate will be the arithmetic mean of the rates for the last transaction in overnight, U.S. dollar federal funds arranged, before 9:00 A.M., New York City time, on the relevant Interest Determination Date, by three leading brokers of U.S. dollar federal funds transactions in New York City selected by the Calculation Agent.

(iii) If fewer than three brokers selected by the Calculation Agent are quoting as described above, the Federal Funds Rate in effect for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

Prime Rate. If the Interest Rate Basis of this Subordinated Note is the Prime Rate, this Subordinated Note will bear interest at a Base Rate equal to the Prime Rate, as adjusted by the Spread or Spread Multiplier, if any, specified on the face hereof.

The Prime Rate will be the rate, for the relevant Interest Determination Date, published in H.15(519) under the heading “Bank Prime Loan.” If the Prime Rate cannot be determined as described above, the following procedures will apply.

(i) If the rate described above does not appear in H.15(519) at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from that source at that time), then the Prime Rate will be the rate, for the relevant Interest Determination Date, as published in H.15 Daily Update or another recognized electronic source used for the purpose of displaying that rate, under the heading “Bank Prime Loan.”

(ii) If the rate described above does not appear in H.15(519), H.15 Daily Update or another recognized electronic source at 3:00 P.M., New York City time, on the relevant Interest Calculation Date (unless the calculation is made earlier and the rate is available from one of those sources at that time), then the Prime Rate will be the arithmetic mean of the rates of interest publicly announced by each bank appearing on the Reuters Screen US PRIME 1 Page (as defined below) as that bank’s prime rate or base lending rate, as of 11:00 A.M., New York City time, on the relevant Interest Determination Date.

(iii) If fewer than four of these rates appear on the Reuters Screen US PRIME 1 Page, the Prime Rate will be the arithmetic mean of the prime rates or base lending rates, as of the close of business on the relevant Interest Determination Date, of three major banks in New York City selected by the Calculation Agent. For this purpose, the Calculation Agent will use rates quoted on the basis of the actual number of days in the year divided by a 360-day year.

(iv) If fewer than three banks selected by the Calculation Agent are quoting as described above, the Prime Rate for the new Interest Reset Period will be the rate in effect for the prior Interest Reset Period.

Definitions of Terms Used in Interest Rate Bases. The terms listed below are defined as follows:

“Bond Equivalent Yield” means a yield expressed as a percentage and calculated in accordance with the following formula:

            D x N             x 100

360 - (D x M)            

where (i) “D” means the annual rate for treasury bills quoted on a bank discount basis and expressed as a decimal, (ii) “N” means the number of days in the year, 365 or 366, as the case may be, and (iii) “M” means the actual number of days in the applicable Interest Reset Period.

“Business Day” means, for purposes of calculating interest on this Subordinated Note, a day that is a Monday, Tuesday, Wednesday, Thursday or Friday that is not a day on which banking institutions in New York City generally are authorized or obligated by law, regulation or executive order to close and, if the Interest Rate Basis specified on the face hereof is LIBOR, is also a London Business Day.

“Designated CMT Index Maturity” means the Index Maturity for a Note having as its Interest Rate Basis the CMT Rate and will be the original period to maturity of a U.S. treasury security — either 1, 2, 3, 5, 7, 10, 20 or 30 years — specified in the applicable pricing supplement. If no such original maturity period is so specified, the Designated CMT Index Maturity will be 2 years.

“Designated CMT Reuters Screen Page” means the Reuters Screen Page specified on the face of this Subordinated Note (if the Interest Rate Basis is the CMT Rate) that displays treasury constant maturities as reported in H.15(519). If no Reuters Screen Page is so specified, then the applicable page will be Reuters Screen FEDCMT Page. If Reuters Screen FEDCMT Page applies but this Subordinated Note does not specify whether the weekly or monthly average applies, the weekly average will apply.

“H.15(519)” means the weekly statistical release entitled “Statistical Release H.15 (519)” or any successor publication, published by the Board of Governors of the Federal Reserve System.

“H.15 Daily Update” means the daily update of H.15(519) available through the world wide web site of the Board of Governors of the Federal Reserve System, at http://www.federalreserve.gov/releases/h15/update or any successor site or publication.

“Index Maturity” means the period to maturity of the instrument or obligation on which the interest rate formula is based, as specified on the face of this Subordinated Note.

“London Business Day” means any day on which dealings in U.S. dollars are transacted in the London interbank market.

“Money Market Yield” means a yield expressed as a percentage and calculated in accordance with the following formula:

            D x 360             x 100

360 - (D x M)            

where (a) “D” means the annual rate for commercial paper quoted on a bank discount basis and expressed as a decimal, and (b) “M” means the actual number of days in the relevant Interest Reset Period.

“Representative Amount” means an amount that, in the Calculation Agent’s judgment, is representative of a single transaction in the relevant market at the relevant time.

“Reuters Screen LIBOR01 Page” means the display on the Reuters Monitor Money Rates Service, or any successor service, on the page designated as “LIBO” or any replacement page or pages on which London interbank rates of major banks for U.S. dollars are displayed.

“Reuters Screen Page” means the display on Reuters, or any successor service, on the page or pages specified in this Subordinated Note, or any replacement page or pages on that service.

“Reuters Screen US PRIME 1 Page” means the display on the “US PRIME 1” page on the Reuters Monitor Money Rates Service, or any successor service, or any replacement page or pages on that service, for the purpose of displaying prime rates or base lending rates of major U.S. banks.

References to particular headings on pages designated by the following terms include any successor or replacement heading or headings as determined by the Calculation Agent: CMT Reuters Screen Page, H.15(519), H.15 Daily Update, Reuters Screen LIBOR01 Page, Reuters Screen US PRIME 1 Page or Reuters Screen Page.

If this Subordinated Note is an Original Issue Discount Note and if an Event of Default with respect to this Subordinated Note shall have occurred and be continuing, the Default Amount (as defined hereafter) of this Subordinated Note may be declared due and payable in the manner and with the effect provided herein. The ‘Default Amount” shall be equal to the adjusted issue price as of the first day of the accrual period as determined under Treasury Regulation Section 1.1275-1(b) (or successor regulation) under the United States Internal Revenue Code of 1986, as amended, in which the date of acceleration occurs increased by the daily portion of the original issue discount for each day in such accrual period ending on the date of acceleration, as determined under Treasury Regulation Section 1.1275-1(b) (or successor regulation) under the United States Internal Revenue Code of 1986, as amended. Upon payment of (i) the amount of principal or premium, if any, so declared due and payable and (ii) interest on any overdue principal and overdue interest or premium, if any (in each case to the extent that the payment of such interest shall be legally enforceable), all of the Bank’s obligations in respect of the payment of the principal of, and interest or premium, if any, on, this Subordinated Note shall terminate.

In case any Subordinated Note shall at any time become mutilated, destroyed, lost or stolen and such Subordinated Note or evidence satisfactory to the Bank of the loss, theft or destruction thereof (together with indemnity satisfactory to the Bank and such other documents or proof as may be required in the premises) shall be delivered to the Bank, a new Subordinated Note of like tenor will be issued by the Bank in exchange for the Subordinated Note so mutilated, or in lieu of the Subordinated Note so destroyed or lost or stolen. All expenses and reasonable charges associated with procuring the indemnity referred to above and with the preparation, authentication and delivery of a new Subordinated Note shall be borne by the holder of the

Subordinated Note so mutilated, destroyed, lost or stolen. If any Subordinated Note which has matured or is about to mature shall become mutilated, destroyed, lost or stolen, the Bank may, instead of issuing a substitute Subordinated Note, pay or authorize the payment of the same (without surrender thereof except in the case of a mutilated Subordinated Note) upon compliance by the holder thereof with the provisions of this paragraph.

No recourse shall be had for the payment of the principal of, premium, if any, or interest on, this Subordinated Note, for any claim based hereon, or otherwise in respect hereof, against any shareholder, employee, officer or director, as such, past, present or future, of the Bank or of any successor corporation, either directly or through the Bank or any successor corporation, whether by virtue of any constitution, statute or rule of law or by the enforcement of any assessment or penalty or otherwise, all such liability being, by the acceptance hereof and as part of the consideration for the issue hereof, expressly waived and released.

An “Event of Default” with respect to this Subordinated Note will occur if the Bank shall consent to, or a court or other governmental agency shall enter a decree or order for, the appointment of a receiver or other similar official in any liquidation, insolvency or similar proceeding with respect to the Bank or all or substantially all of its property and, in the case of a decree or order, such decree or order shall have remained in force for a period of 60 days. If an Event of Default shall occur and be continuing, the holder of this Subordinated Note may declare the principal amount of, and accrued interest and premium, if any, on, this Subordinated Note due and payable immediately by written notice to the Bank. Upon such declaration and notice, such principal amount, accrued interest and premium, if any, shall become due and payable seven calendar days after such notice. Any Event of Default with respect to this Subordinated Note may be waived by the holder hereof. No payment may be made on this Subordinated Note in the event of acceleration resulting from an Event of Default without the prior written consent of the Federal Reserve Bank of Chicago. There is no right of acceleration in the case of a default in the payment of principal of, or interest on, this Subordinated Note or in the performance of any other obligation of the Bank under this Subordinated Note or under any other security issued by the Bank.

No provision of this Subordinated Note shall alter or impair the obligation of the Bank, which is absolute and unconditional, to pay the principal, and premium, if any, and interest on, this Subordinated Note in U.S. dollars at the times, places and rate herein prescribed.

The Bank shall cause to be kept at the corporate trust office of the Subordinated Note Registrar designated below a register (the register maintained in such corporate trust office or any other office or agency of the Bank in the Place of Payment herein referred to as the “Subordinated Note Register”) in which, subject to such reasonable regulations as it may prescribe, the Bank shall provide for the registration of the Subordinated Notes and of transfers of the Subordinated Notes. The Bank is hereby initially appointed “Subordinated Note Registrar” for the purposes of registering the Subordinated Notes and transfers of the Subordinated Notes as herein provided.

The transfer of this Subordinated Note is registrable in the Subordinated Note Register, upon surrender of this Subordinated Note for registration of transfer at the office or agency of the Bank in the Place of Payment, duly endorsed by, or accompanied by a written instrument of transfer in form satisfactory to the Bank and the Paying Agent duly executed by, the holder hereof or his attorney duly authorized in writing, and thereupon one or more new Subordinated Notes of like tenor, of authorized denominations and for the same aggregate principal amount, will be issued to the designated transferee or transferees. Notwithstanding the foregoing, the Bank shall not be required to register the transfer of any Subordinated Note that. has been called for redemption during a period beginning at the opening of business fifteen calendar days before the day of mailing of a notice of such redemption and ending at the close of business on the day of such mailing.

No service charge shall be made for any such registration of transfer or exchange, but the Bank may require payment of a sum sufficient to cover any tax or other governmental charge payable in connection therewith.

The Subordinated Notes are issuable only in registered form without coupons in minimum denominations of $250,000 and any integral multiple of $1,000 in excess thereof. Each owner of a beneficial interest in this Subordinated Note is required to hold a beneficial interest in $250,000 principal amount or any integral multiple of $1,000 in excess thereof of this Subordinated Note at all times.

Prior to due presentment of this Subordinated Note for registration of transfer, the Bank, the Paying Agent or any agent of the Bank or the Paying Agent may treat the person in whose name this Subordinated Note is registered as the owner hereof for all purposes, whether or not this Subordinated Note be overdue, and neither the Bank, the Paying Agent nor any such agent shall be affected by notice to the contrary.

All notices to the Bank under this Subordinated Note shall be in writing and addressed to the Bank at 50 South LaSalle Street, Chicago, Illinois 60675, or to such other address of the Bank as the Bank may notify the holders of the Subordinated Notes.

This Subordinated Note shall be governed by, and construed in accordance with, the laws of the State of Illinois.

IN WITNESS WHEREOF, the Bank has caused this instrument to be duly executed.

THE NORTHERN TRUST COMPANY
By:
	Authorized Signatory

ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of the within Subordinated Note, shall be construed as though they were written out in full according to applicable laws or regulations.

TEN COM	-	as tenants in common
TEN ENT	-	as tenants by the entireties
JT TEN	-	as joint tenants with right of survivorship and not as tenants in common

UNIF GIFT MIN ACT -		Custodian
	(Cust)		(Minor)
		under Uniform Gifts to Minors Act
		(State)

Additional abbreviations may also be used

though not in the above list.

ASSIGNMENT

FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto

PLEASE INSERT SOCIAL SECURITY NUMBER OR OTHER IDENTIFYING NUMBER OF ASSIGNEE

(Please print or typewrite name and address,

including postal zip code, of assignee)

the within Subordinated Note and all rights thereunder, and hereby irrevocably constitutes and appoints                     to transfer said Subordinated Note on the books of the Bank, with full power of substitution in the premises.

Dated:                    

Notice: The signature to this assignment must correspond with the name as written upon the face of the within Subordinated Note in every particular, without alteration or enlargement or any change whatsoever.

20

EX-31.(I)

Exhibit 31(i)

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, 2011 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.

Date: October 28, 2011

/s/ Frederick H. Waddell

     Frederick H. Waddell

     Chief Executive Officer

EX-31.(II)

Exhibit 31(ii)

Certification of CFO Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Michael G. O’Grady, certify that:

1. I have reviewed this report on Form 10-Q for the quarterly period ending September 30, 2011 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.

Date: October 28, 2011	/s/ Michael G. O’Grady
	Michael G. O’Grady
	Chief Financial Officer

EX-32.(I)

Exhibit 32(i)

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, 2011 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 Michael G. O’Grady, 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

October 28, 2011

/s/ Michael G. O’Grady

Michael G. O’Grady

Chief Financial Officer

October 28, 2011

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

XML

Contingent Liabilities - Additional Information (Detail) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items]
Standby letters of credit outstanding	$ 4,400,000,000	$ 4,300,000,000
Standby letters of credit, unamortized fees	46,700,000	36,700,000
Minimum securities lending related collateral percentage	100.00%	100.00%
Possible loss in future periods in excess of accrual	31,000,000
Indemnification Agreement
Commitments and Contingencies Disclosure [Line Items]
Collateralized securities loaned, subject to indemnification	78,100,000,000	74,900,000,000
Credit loss liability	0	0
Visa Indemnification
Commitments and Contingencies Disclosure [Line Items]
Fair value of net Visa indemnification liability	$ 13,000,000	$ 23,100,000

XML

Maturity of Securities (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Available for Sale - Amortized Cost
Due in One Year or Less	$ 11,153.3
Due After One Year Through Five Years	15,578.1
Due After Five Years Through Ten Years	851.7
Due After Ten Years	749.7
Total	28,332.8
Held to Maturity - Amortized Cost
Due in One Year or Less	141.6
Due After One Year Through Five Years	284.9
Due After Five Years Through Ten Years	240.7
Due After Ten Years	162.0
Total	829.2	922.2
Available for Sale - Fair Value
Due in One Year or Less	11,155.2
Due After One Year Through Five Years	15,670.4
Due After Five Years Through Ten Years	858.7
Due After Ten Years	755.0
Total	28,439.3
Held to Maturity - Fair Value
Due in One Year or Less	142.2
Due After One Year Through Five Years	292.9
Due After Five Years Through Ten Years	250.8
Due After Ten Years	161.3
Fair Value	$ 847.2	$ 941.8

XML

CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Millions, except Share data	Sep. 30, 2011	Dec. 31, 2010
Held to Maturity, Fair value	$ 847.2	$ 941.8
Total Loans and Leases, unearned income	$ 417.3	$ 456.8
Common Stock, Par Value	$ 1.6667	$ 1.6667
Common Stock, Authorized	560,000,000	560,000,000
Common Stock, Outstanding	240,996,807	242,268,903
Treasury Stock, shares	4,174,717	2,902,621

XML

CONSOLIDATED STATEMENT OF INCOME (USD $) In Millions, except Share data	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Noninterest Income
Trust, Investment and Other Servicing Fees	$ 555.3		$ 518.7		$ 1,628.0		$ 1,577.3
Foreign Exchange Trading Income	87.2		88.9		252.8		284.0
Treasury Management Fees	17.8		19.3		55.1		59.3
Security Commissions and Trading Income	13.9		14.9		44.8		43.5
Other Operating Income	42.5		27.7		120.4		104.1
Investment Security Gains (Losses), net	(2.0)	[1]	(13.5)	[1]	(24.1)	[1]	(13.3)	[1]
Total Noninterest Income	714.7		656.0		2,077.0		2,054.9
Net Interest Income
Interest Income	347.1		330.2		1,053.8		962.4
Interest Expense	90.3		96.7		316.5		265.7
Net Interest Income	256.8		233.5		737.3		696.7
Provision for Credit Losses	17.5		30.0		42.5		120.0
Net Interest Income after Provision for Credit Losses	239.3		203.5		694.8		576.7
Noninterest Expense
Compensation	311.1		273.3		925.3		826.2
Employee Benefits	66.7		60.0		188.7		181.9
Outside Services	139.7		110.7		398.6		330.9
Equipment and Software	76.3		72.6		232.8		209.0
Occupancy	45.4		42.6		131.3		127.2
Visa Indemnification Benefit					(10.1)		(12.7)
Other Operating Expense	62.0		62.9		192.9		193.7
Total Noninterest Expense	701.2		622.1		2,059.5		1,856.2
Income before Income Taxes	252.8		237.4		712.3		775.4
Provision for Income Taxes	82.4		81.8		238.9		263.0
Net Income	170.4		155.6		473.4		512.4
Net Income Applicable to Common Stock	$ 170.4		$ 155.6		$ 473.4		$ 512.4
Per Common Share
Net Income - Basic	$ 0.70		$ 0.64		$ 1.94		$ 2.10
- Diluted	$ 0.70		$ 0.64		$ 1.93		$ 2.10
Average Number of Common Shares Outstanding - Basic	240,991,491		242,124,461		241,529,793		241,966,279
- Diluted	241,193,993		242,158,427		242,018,750		242,421,661

[1] Changes in Other-Than-Temporary-Impairment (OTTI) Losses $ .5 $ 7.3 $ (1.1 ) $ 6.6 Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI (1.8 ) (21.3 ) (22.2 ) (20.7 ) Other Security Gains (Losses), net (.7 ) .5 (.8 ) .8 Investment Security Gains (Losses), net $ (2.0 ) $ (13.5 ) $ (24.1 ) $ (13.3 )

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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, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Segment Reporting Information [Line Items]
Trust, Investment and Other Servicing Fees	$ 555.3		$ 518.7		$ 1,628.0		$ 1,577.3
Other	159.4		137.3		449.0		477.6
Net Interest Income (FTE)	266.6	[1]	243.0	[1]	768.1	[2]	725.5	[2]
Revenues	981.3	[1]	899.0	[1]	2,845.1	[2]	2,780.4	[2]
Provision for Credit Losses	17.5		30.0		42.5		120.0
Noninterest Expenses	701.2		622.1		2,059.5		1,856.2
Income before Income Taxes	262.6	[1]	246.9	[1]	743.1	[2]	804.2	[2]
Provision for Income Taxes	92.2	[1]	91.3	[1]	269.7	[2]	291.8	[2]
Net Income	170.4		155.6		473.4		512.4
Percentage of Consolidated Net Income	100.00%		100.00%		100.00%		100.00%
Average Assets	94,029.7		74,706.7		89,924.2		74,626.1
Corporate and Institutional Services
Segment Reporting Information [Line Items]
Trust, Investment and Other Servicing Fees	310.9		293.2		890.7		906.5
Other	125.0		114.9		373.8		384.9
Net Interest Income (FTE)	71.2	[1]	67.2	[1]	199.1	[2]	207.9	[2]
Revenues	507.1	[1]	475.3	[1]	1,463.6	[2]	1,499.3	[2]
Provision for Credit Losses	(1.9)		(2.8)		(18.8)		(11.3)
Noninterest Expenses	375.8		330.6		1,096.2		977.9
Income before Income Taxes	133.2	[1]	147.5	[1]	386.2	[2]	532.7	[2]
Provision for Income Taxes	50.3	[1]	51.9	[1]	147.4	[2]	187.7	[2]
Net Income	82.9		95.6		238.8		345.0
Percentage of Consolidated Net Income	49.00%		61.00%		50.00%		67.00%
Average Assets	49,755.5		38,701.2		47,079.8		37,775.9
Personal Financial Services
Segment Reporting Information [Line Items]
Trust, Investment and Other Servicing Fees	244.4		225.5		737.3		670.8
Other	30.7		33.3		94.9		100.0
Net Interest Income (FTE)	157.1	[1]	151.0	[1]	456.6	[2]	439.3	[2]
Revenues	432.2	[1]	409.8	[1]	1,288.8	[2]	1,210.1	[2]
Provision for Credit Losses	19.4		32.8		61.3		131.3
Noninterest Expenses	300.6		274.6		893.3		814.1
Income before Income Taxes	112.2	[1]	102.4	[1]	334.2	[2]	264.7	[2]
Provision for Income Taxes	44.5	[1]	39.0	[1]	132.7	[2]	100.5	[2]
Net Income	67.7		63.4		201.5		164.2
Percentage of Consolidated Net Income	40.00%		41.00%		43.00%		32.00%
Average Assets	23,809.5		23,495.9		23,696.1		23,527.4
Treasury and Other
Segment Reporting Information [Line Items]
Other	3.7		(10.9)		(19.7)		(7.3)
Net Interest Income (FTE)	38.3	[1]	24.8	[1]	112.4	[2]	78.3	[2]
Revenues	42.0	[1]	13.9	[1]	92.7	[2]	71.0	[2]
Noninterest Expenses	24.8		16.9		70.0		64.2
Income before Income Taxes	17.2	[1]	(3.0)	[1]	22.7	[2]	6.8	[2]
Provision for Income Taxes	(2.6)	[1]	0.4	[1]	(10.4)	[2]	3.6	[2]
Net Income	19.8		(3.4)		33.1		3.2
Percentage of Consolidated Net Income	11.00%		(2.00%)		7.00%		1.00%
Average Assets	$ 20,464.7		$ 12,509.6		$ 19,148.3		$ 13,322.8

[1] Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $9.8 million for 2011 and $9.5 million for 2010.

[2] Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $30.8 million for 2011 and $28.8 million for 2010.

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Book Values, Ultimate Default Rates, and Loss Severity Rates for the Non-Agency Residential Mortgage-Backed Securities Portfolio, by Security Type (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Composition of Loan Portfolio [Line Items]
Amortized Cost	$ 28,332.8	$ 19,912.7
Non-Agency RMBS
Composition of Loan Portfolio [Line Items]
Amortized Cost	215.8
Weighted Average Ultimate Default Rates	42.40%
Loss Severity Rates - Weighted Average	75.00%
Non-Agency RMBS | Upper Limit
Composition of Loan Portfolio [Line Items]
Loss Severity Rates	100.00%
Non-Agency RMBS | Upper Limit | Prime
Composition of Loan Portfolio [Line Items]
Loss Severity Rates	66.00%
Non-Agency RMBS | Upper Limit | Alt-A
Composition of Loan Portfolio [Line Items]
Loss Severity Rates	71.70%
Non-Agency RMBS | Upper Limit | Subprime
Composition of Loan Portfolio [Line Items]
Loss Severity Rates	86.00%
Non-Agency RMBS | Upper Limit | 2nd Lien
Composition of Loan Portfolio [Line Items]
Loss Severity Rates	100.00%
Non-Agency RMBS | Lower Limit
Composition of Loan Portfolio [Line Items]
Loss Severity Rates	39.40%
Non-Agency RMBS | Lower Limit | Prime
Composition of Loan Portfolio [Line Items]
Loss Severity Rates	39.40%
Non-Agency RMBS | Lower Limit | Alt-A
Composition of Loan Portfolio [Line Items]
Loss Severity Rates	57.90%
Non-Agency RMBS | Lower Limit | Subprime
Composition of Loan Portfolio [Line Items]
Loss Severity Rates	68.80%
Non-Agency RMBS | Lower Limit | 2nd Lien
Composition of Loan Portfolio [Line Items]
Loss Severity Rates	98.80%
Non-Agency RMBS | Prime
Composition of Loan Portfolio [Line Items]
Amortized Cost	24.4
Weighted Average Ultimate Default Rates	16.10%
Loss Severity Rates - Weighted Average	51.80%
Non-Agency RMBS | Alt-A
Composition of Loan Portfolio [Line Items]
Amortized Cost	35.4
Weighted Average Ultimate Default Rates	41.90%
Loss Severity Rates - Weighted Average	68.50%
Non-Agency RMBS | Subprime
Composition of Loan Portfolio [Line Items]
Amortized Cost	120.4
Weighted Average Ultimate Default Rates	51.10%
Loss Severity Rates - Weighted Average	74.40%
Non-Agency RMBS | 2nd Lien
Composition of Loan Portfolio [Line Items]
Amortized Cost	$ 35.6
Weighted Average Ultimate Default Rates	33.10%
Loss Severity Rates - Weighted Average	99.50%

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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	Sep. 30, 2011	Dec. 31, 2010
Derivative [Line Items]
Notional Value	$ 275,184.1	$ 246,434.9
Fair Value Asset	5,396.5	5,899.2
Fair Value Liability	5,379.5	5,878.4
Foreign Exchange Contracts
Derivative [Line Items]
Notional Value	270,614.5	242,007.1
Fair Value Asset	5,202.9	5,747.9
Fair Value Liability	5,190.0	5,729.9
Interest Rate Option Contracts
Derivative [Line Items]
Notional Value	100.7	126.1
Fair Value Asset		0.1
Fair Value Liability		0.1
Interest Rate Swap Contracts
Derivative [Line Items]
Notional Value	4,468.9	4,301.7
Fair Value Asset	193.6	151.2
Fair Value Liability	$ 189.5	$ 148.4

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Net Investment Hedge Gains and Losses Recognized in AOCI (Detail) (Net Investment Hedges, USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative [Line Items]
Hedging Instrument Gain/(Loss) Recognized in AOCI (Before Tax)	$ 81.3	$ (121.8)	$ (4.1)	$ 43.6
Foreign Exchange Contracts
Derivative [Line Items]
Hedging Instrument Gain/(Loss) Recognized in AOCI (Before Tax)	75.6	(109.1)	(1.9)	29.6
Sterling Denominated Subordinated Debt
Derivative [Line Items]
Hedging Instrument Gain/(Loss) Recognized in AOCI (Before Tax)	5.7	(6.9)	(2.2)	3.5
Sterling Denominated Senior Debt
Derivative [Line Items]
Hedging Instrument Gain/(Loss) Recognized in AOCI (Before Tax)		$ (5.8)		$ 10.5

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Pension and Other Postretirement Plans

9 Months Ended

Sep. 30, 2011

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, 2011 and 2010.

Net Periodic Pension Expense

U.S. Plan

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(In Millions)	2011			2010			2011			2010
Service Cost	$	10.7		$	9.5		$	32.1		$	28.5
Interest Cost		10.2			9.2			30.6			27.6
Expected Return on Plan Assets		(19.7	)		(18.3	)		(59.1	)		(54.9	)
Amortization
Net Loss		6.5			5.0			19.5			15.0
Prior Service Cost		.4			.4			1.2			1.2
Net Periodic Pension Expense	$	8.1		$	5.8		$	24.3		$	17.4

Net Periodic Pension Expense

Non U.S. Plans

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(In Millions)	2011			2010			2011			2010
Service Cost	$	—		$	.2		$	—		$	1.8
Interest Cost		1.6			1.9			4.9			5.2
Expected Return on Plan Assets		(2.1	)		(2.3	)		(6.2	)		(6.2	)
Net Loss Amortization		.1			.1			.1			.5
Gain on Curtailment of Non-U.S. Plan		—			—			—			(2.2	)
Net Periodic Pension Benefit	$	(.4	)	$	(.1	)	$	(1.2	)	$	(.9	)

Net Periodic Pension Expense

Supplemental Plan

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions)	2011		2010		2011		2010
Service Cost	$	.8	$	.8	$	2.4	$	2.4
Interest Cost		1.1		1.2		3.3		3.6
Amortization
Net Loss		1.4		1.5		4.2		4.5
Prior Service Cost		.1		—		.3		—
Net Periodic Pension Expense	$	3.4	$	3.5	$	10.2	$	10.5

Net Periodic Benefit Expense

Other Postretirement Plan

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(In Millions)	2011			2010			2011			2010
Service Cost	$	.1		$	.2		$	.3		$	.6
Interest Cost		.7			.7			2.1			2.1
Amortization
Net Loss		.4			.5			1.2			1.5
Prior Service Cost		(1.3	)		(1.3	)		(3.9	)		(3.9	)
Net Periodic Benefit Expense (Benefit)	$	(.1	)	$	.1		$	(.3	)	$	.3

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Compensation Expense for Share-Based Payment Arrangements and the Associated Tax Impacts (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	$ 15.7	$ 11.4	$ 54.4	$ 40.9
Tax Benefits Recognized	5.8	4.2	20.2	15.0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	6.3	5.3	27.8	22.6
Stock and Stock Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Expense	$ 9.4	$ 6.1	$ 26.6	$ 18.3

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Document and Entity Information	9 Months Ended
	Sep. 30, 2011
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2011
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	240,996,807

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Book and Fair Values of Financial Instruments (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Dec. 31, 2009
Assets
Cash and Due from Banks	$ 4,336.6	$ 2,818.0	$ 3,489.5	$ 2,491.8
Federal Funds Sold and Resell Agreements	221.8	160.1
Interest-Bearing Deposits with Banks	18,944.2	15,351.3
Federal Reserve Deposits and Other Interest-Bearing	6,498.2	10,924.6
Securities
Available for Sale	28,439.3	19,901.9
Held to Maturity	829.2	922.2
Trading Account	6.3	6.8
Loans (excluding Leases)
Client Security Settlement Receivables	948.2	701.3
Deposits
Savings Certificates, Other Time and Non U. S. Offices Interest-Bearing	3,529.4	3,913.0
Federal Funds Purchased	737.8	3,691.7
Securities Sold under Agreements to Repurchase	339.3	954.4
Other Borrowings	817.6	347.7
Senior Notes	2,133.5	1,896.1
Carrying (Reported) Amount, Fair Value Disclosure
Assets
Cash and Due from Banks	4,336.6	2,818.0
Federal Funds Sold and Resell Agreements	221.8	160.1
Interest-Bearing Deposits with Banks	18,944.2	15,351.3
Federal Reserve Deposits and Other Interest-Bearing	6,498.2	10,924.6
Securities
Available for Sale	28,439.3	19,901.9
Held to Maturity	829.2	922.2
Trading Account	6.3	6.8
Loans (excluding Leases)
Held for Investment	27,369.6	26,747.8
Held for Sale	10.0	2.2
Client Security Settlement Receivables	948.2	701.3
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	185.3	185.5
Affordable Housing Investments	252.3	265.4
Deposits
Demand, Noninterest-Bearing, and Savings and Money Market	37,401.0	24,810.3
Savings Certificates, Other Time and Non U. S. Offices Interest-Bearing	41,113.0	39,385.4
Federal Funds Purchased	737.8	3,691.7
Securities Sold under Agreements to Repurchase	339.3	954.4
Other Borrowings	817.6	347.7
Senior Notes	2,133.5	1,896.1
Long Term Debt (excluding Leases)
Subordinated Debt	1,036.6	1,148.7
Federal Home Loan Bank Borrowings	1,055.0	1,532.5
Floating Rate Capital Debt	276.9	276.9
Financial Guarantees	102.2	58.6
Loan Commitments	32.8	32.4
Carrying (Reported) Amount, Fair Value Disclosure | Asset And Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets	23.7	44.9
Liabilities	26.8	51.4
Carrying (Reported) Amount, Fair Value Disclosure | Asset And Liability Management | Interest Rate Swap Contracts
Derivative Instruments
Assets	154.4	134.6
Liabilities	42.8	15.3
Carrying (Reported) Amount, Fair Value Disclosure | Asset And Liability Management | Credit Default Swap Contracts
Derivative Instruments
Liabilities	0.4	2.8
Carrying (Reported) Amount, Fair Value Disclosure | Asset And Liability Management | Forward Contracts
Derivative Instruments
Assets		0.5
Liabilities		0.2
Carrying (Reported) Amount, Fair Value Disclosure | Client Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets	5,202.9	5,747.9
Liabilities	5,190.0	5,729.9
Carrying (Reported) Amount, Fair Value Disclosure | Client Related and Trading | Interest Rate Swap Contracts
Derivative Instruments
Assets	193.6	151.2
Liabilities	189.5	148.4
Carrying (Reported) Amount, Fair Value Disclosure | Client Related and Trading | Interest Rate Option Contracts
Derivative Instruments
Assets		0.1
Liabilities		0.1
Estimate of Fair Value, Fair Value Disclosure
Assets
Cash and Due from Banks	4,336.6	2,818.0
Federal Funds Sold and Resell Agreements	221.8	160.1
Interest-Bearing Deposits with Banks	18,944.2	15,351.3
Federal Reserve Deposits and Other Interest-Bearing	6,498.2	10,924.6
Securities
Available for Sale	28,439.3	19,901.9
Held to Maturity	847.2	941.8
Trading Account	6.3	6.8
Loans (excluding Leases)
Held for Investment	27,603.0	26,814.2
Held for Sale	10.0	2.2
Client Security Settlement Receivables	948.2	701.3
Other Assets
Federal Reserve and Federal Home Loan Bank Stock	185.3	185.5
Affordable Housing Investments	252.3	265.4
Deposits
Demand, Noninterest-Bearing, and Savings and Money Market	37,401.0	24,810.3
Savings Certificates, Other Time and Non U. S. Offices Interest-Bearing	41,126.0	39,402.1
Federal Funds Purchased	737.8	3,691.7
Securities Sold under Agreements to Repurchase	339.3	954.4
Other Borrowings	817.6	347.7
Senior Notes	2,196.1	1,936.5
Long Term Debt (excluding Leases)
Subordinated Debt	1,038.9	1,177.2
Federal Home Loan Bank Borrowings	1,101.9	1,613.5
Floating Rate Capital Debt	229.9	223.2
Financial Guarantees	102.2	58.6
Loan Commitments	32.8	32.4
Estimate of Fair Value, Fair Value Disclosure | Asset And Liability Management | Foreign Exchange Contracts
Derivative Instruments
Assets	23.7	44.9
Liabilities	26.8	51.4
Estimate of Fair Value, Fair Value Disclosure | Asset And Liability Management | Interest Rate Swap Contracts
Derivative Instruments
Assets	154.4	134.6
Liabilities	42.8	15.3
Estimate of Fair Value, Fair Value Disclosure | Asset And Liability Management | Credit Default Swap Contracts
Derivative Instruments
Liabilities	0.4	2.8
Estimate of Fair Value, Fair Value Disclosure | Asset And Liability Management | Forward Contracts
Derivative Instruments
Assets		0.5
Liabilities		0.2
Estimate of Fair Value, Fair Value Disclosure | Client Related and Trading | Foreign Exchange Contracts
Derivative Instruments
Assets	5,202.9	5,747.9
Liabilities	5,190.0	5,729.9
Estimate of Fair Value, Fair Value Disclosure | Client Related and Trading | Interest Rate Swap Contracts
Derivative Instruments
Assets	193.6	151.2
Liabilities	189.5	148.4
Estimate of Fair Value, Fair Value Disclosure | Client Related and Trading | Interest Rate Option Contracts
Derivative Instruments
Assets		0.1
Liabilities		$ 0.1

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Contingent Liabilities

9 Months Ended

Sep. 30, 2011

Contingent Liabilities

18. Contingent Liabilities – 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. Certain standby letters of credit have been secured with cash deposits or participated to others and in certain cases Northern Trust is able to recover the amounts paid through recourse against these cash deposits or other participants. Standby letters of credit outstanding were $4.4 billion at September 30, 2011 and $4.3 billion at December 31, 2010. Northern Trust’s liability included within the consolidated balance sheet for standby letters of credit, measured as the amount of unamortized fees on these instruments, was $46.7 million at September 30, 2011 and $36.7 million at December 31, 2010.

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 by the Northern Trust Senior Credit Committee. In connection with these activities, Northern Trust has issued indemnifications against certain losses resulting from the bankruptcy of borrowers of securities. Borrowers are required to fully collateralize 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 $78.1 billion at September 30, 2011 and $74.9 billion at December 31, 2010. Because of the credit quality of the borrowers and the requirement to fully collateralize securities borrowed, management believes that the exposure to credit loss from this activity is not significant and no liability was recorded at September 30, 2011 or December 31, 2010 related to these indemnifications.

As discussed in further detail in Note 13, Northern Trust, as a member bank of Visa U.S.A., and in conjunction with other member banks, is required to recognize, at its estimated fair value in accordance with GAAP, a guarantee liability arising from such litigation that has not yet settled. The estimated fair value of the net Visa indemnification liability, recorded within other liabilities in the consolidated balance sheet, totaled $13.0 million at September 30, 2011 and $23.1 million at December 31, 2010.

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 cases in which the Corporation is able to estimate a range of reasonably possible loss mean the upper end of the range of loss for cases for which the Corporation believes the risk of loss is more than remote.

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, or (vi) 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, 2011, the Corporation has estimated the upper end of the range of reasonably possible losses for these matters to be approximately $31 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. The following is a description of the nature of certain of these matters.

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 putative 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). Based on our review of these matters, we believe we operated our securities lending program prudently and appropriately. The Corporation has also been cooperating fully with an SEC investigation related to our securities lending program. At this stage of these proceedings, it is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss.

On January 16, 2009, an amended complaint was filed in a putative class action lawsuit currently pending in the United States District Court for the Northern District of Illinois against the Corporation and others. The defendants named in the amended complaint are the Corporation, The Northern Trust Company, the Northern Trust Employee Benefits Administrative Committee and its members, the Northern Trust Employee Benefits Investment Committee and its members, and certain other officers, including the present and former Chief Executive Officers of the Corporation, purportedly on behalf of participants in and beneficiaries of The Northern Trust Company Thrift-Incentive Plan (the “Plan”) whose individual accounts held shares of Corporation common stock at any time from October 19, 2007 to January 14, 2009. The complaint purports to allege breaches of fiduciary duty in violation of ERISA related to the Corporation’s stock being offered as an investment alternative for participants in the Plan and seeks monetary damages in an unspecified amount. On September 14, 2011, the parties filed a stipulation voluntarily dismissing the complaint; that stipulation is without prejudice to the claims of the members of the putative class other than the four named plaintiffs, whose claims were released and discharged.

On August 24, 2010, a lawsuit (hereinafter referred to as the “Securities Class Action”) was filed in federal court in the Northern District of Illinois against the Corporation and three of its present or former officers, including the present and former Chief Executive Officers of the Corporation, on behalf of a purported class of purchasers of Corporation stock during the period from October 17, 2007 to October 20, 2009. The amended complaint alleges that during the purported class period the defendants violated Sections 10(b) and 20(a) of the Exchange Act by allegedly taking insufficient provisions for credit losses with respect to the Corporation’s real estate loan portfolio and failing to make sufficient disclosures regarding its securities lending business. Plaintiff seeks compensatory damages in an unspecified amount. At this stage of the suit, it is not possible for management to assess the probability of a material adverse outcome or reasonably estimate the amount of any potential loss.

On September 7, 2010, a shareholder derivative lawsuit, purportedly brought on behalf of the Corporation, was filed in the Circuit Court of Cook County, Illinois against a number of the Corporation’s current and former officers and directors. The Corporation is named as a nominal defendant. The complaint asserts that the individual defendants violated their fiduciary duties to the Corporation based upon substantially the same allegations made in the Securities Class Action complaint. Certain individual defendants are also alleged to have sold some of their holdings of Northern Trust Corporation stock while in possession of material nonpublic information. Plaintiff seeks compensatory damages in an unspecified amount from the individual defendants on behalf of the Corporation. The only relief sought against the Corporation is an order requiring the implementation of certain corporate governance procedures.

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Assets Measured at Fair Value on a Nonrecurring Basis (Parenthetical) (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Provision for Credit Losses	$ 17.5	$ 30.0	$ 42.5	$ 120.0
Other Operating Expenses	62.0	62.9	192.9	193.7
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Nonrecurring | Loans | Specific Reserve
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Provision for Credit Losses	3.0	1.7	10.5	16.1
Other Operating Expenses	$ 1.7	$ 2.6	$ 1.8	$ 3.8

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Visa Membership - Additional Information (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Visa Interest
Loss Contingencies [Line Items]
Remaining Visa shares held by Northern Trust, original cost basis	$ 0
Visa Indemnification
Loss Contingencies [Line Items]
Fair value of net Visa indemnification liability	$ 13.0	$ 23.1

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Securities

9 Months Ended

Sep. 30, 2011

Securities

4. Securities —  The following tables provide the amortized cost and fair values of securities at September 30, 2011 and December 31, 2010.

		000000		000000		000000		000000
	September 30, 2011
Securities Available for Sale	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
U.S. Government	$	1,967.4	$	53.5	$	—	$	2,020.9
Obligations of States and Political Subdivisions		17.5		.9		—		18.4
Government Sponsored Agency		16,055.4		78.7		13.4		16,120.7
Corporate Debt		2,840.8		10.2		2.4		2,848.6
Non-U.S. Government Debt		204.3		—		—		204.3
Residential Mortgage-Backed		215.8		—		32.4		183.4
Other Asset-Backed		1,638.3		1.7		2.5		1,637.5
Certificates of Deposit		3,545.2		—		.7		3,544.5
Auction Rate		194.6		4.8		9.8		189.6
Other		1,653.5		18.5		.6		1,671.4
Total	$	28,332.8	$	168.3	$	61.8	$	28,439.3

		0000000		0000000		0000000		0000000
	September 30, 2011
Securities Held to Maturity	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
Obligations of States and Political Subdivisions	$	553.1	$	25.3	$	.1	$	578.3
Government Sponsored Agency		163.9		4.9		—		168.8
Other		112.2		—		12.1		100.1
Total	$	829.2	$	30.2	$	12.2	$	847.2

		00000000		00000000		00000000		00000000
	December 31, 2010
Securities Available for Sale	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
U.S. Government	$	667.2	$	1.0	$	9.8	$	658.4
Obligations of States and Political Subdivisions		35.4		.9		—		36.3
Government Sponsored Agency		11,937.0		47.0		13.3		11,970.7
Corporate Debt		2,547.7		7.8		1.5		2,554.0
Non-U.S. Government Debt		440.6		—		—		440.6
Residential Mortgage-Backed		308.0		.9		54.3		254.6
Other Asset-Backed		1,606.5		1.5		2.3		1,605.7
Certificates of Deposit		1,402.5		—		—		1,402.5
Auction Rate		357.0		14.2		3.4		367.8
Other		610.8		4.2		3.7		611.3
Total	$	19,912.7	$	77.5	$	88.3	$	19,901.9

		0000000		0000000		0000000		0000000
	December 31, 2010
Securities Held to Maturity	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
Obligations of States and Political Subdivisions	$	635.0	$	26.2	$	.4	$	660.8
Government Sponsored Agency		169.3		4.6		.2		173.7
Other		117.9		—		10.6		107.3
Total	$	922.2	$	30.8	$	11.2	$	941.8

The following table provides the remaining maturity of securities as of September 30, 2011.

(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	11,153.3	$	11,155.2
Due After One Year Through Five Years		15,578.1		15,670.4
Due After Five Years Through Ten Years		851.7		858.7
Due After Ten Years		749.7		755.0
Total		28,332.8		28,439.3
Held to Maturity
Due in One Year or Less		141.6		142.2
Due After One Year Through Five Years		284.9		292.9
Due After Five Years Through Ten Years		240.7		250.8
Due After Ten Years		162.0		161.3
Total	$	829.2	$	847.2

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

Investment Security Gains and Losses. Net investment security losses totaling $2.0 million and $24.1 million were recognized for the three and nine months ended September 30, 2011, respectively, and losses totaling $13.5 million and $13.3 million were recognized for the three and nine months ended September 30, 2010, respectively. Included in the net losses were losses that totaled $1.3 million and $23.3 million for the three and nine months ended September 30, 2011, respectively, and $14.0 million and $14.1 million for the three and nine months ended September 30, 2010, respectively. There were $.7 million and $.8 million other realized net security losses for the three and nine months ended September 30, 2011, respectively, and $.5 million and $.8 million of other realized security gains for the three and nine months ended September 30, 2010, respectively.

Securities with Unrealized Losses. The following tables provide information regarding securities that have been in a continuous unrealized loss position for less than 12 months and for 12 months or longer as of September 30, 2011 and December 31, 2010.

Securities with Unrealized     Losses as of September 30, 2011	Less than 12 Months				12 Months or Longer				Total
(In Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Obligations of States and Political Subdivisions	$	1.0	$	—	$	3.1	$	.1	$	4.1	$	.1
Government Sponsored Agency		5,335.3		11.4		414.1		2.0		5,749.4		13.4
Corporate Debt		408.8		1.3		99.2		1.1		508.0		2.4
Residential Mortgage-Backed		5.6		.2		177.4		32.2		183.0		32.4
Other Asset-Backed		687.8		2.2		87.4		.3		775.2		2.5
Certificates of Deposit		2,034.2		.7		—		—		2,034.2		.7
Auction Rate		63.2		4.9		53.9		4.9		117.1		9.8
Other		260.6		2.0		44.8		10.7		305.4		12.7
Total	$	8,796.5	$	22.7	$	879.9	$	51.3	$	9,676.4	$	74.0

Securities with Unrealized Losses     as of December 31, 2010	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	$	492.9	$	9.8	$	—	$	—	$	492.9	$	9.8
Obligations of States and Political Subdivisions		3.0		—		3.2		.4		6.2		.4
Government Sponsored Agency		980.7		11.0		328.7		2.5		1,309.4		13.5
Corporate Debt		930.6		1.1		475.2		.4		1,405.8		1.5
Residential Mortgage-Backed		—		—		248.8		54.3		248.8		54.3
Other Asset-Backed		513.5		2.2		27.0		.1		540.5		2.3
Auction Rate		77.6		3.3		.7		.1		78.3		3.4
Other		482.2		6.8		36.5		7.5		518.7		14.3
Total	$	3,480.5	$	34.2	$	1,120.1	$	65.3	$	4,600.6	$	99.5

As of September 30, 2011, 341 securities with a combined fair value of $9.7 billion were in an unrealized loss position, with their unrealized losses totaling $74.0 million. Unrealized losses on residential mortgage-backed securities totaling $32.4 million reflect the impact of credit and liquidity spreads on the valuations of 25 residential mortgage-backed securities, with $32.2 million having been in an unrealized loss position for more than 12 months. Residential mortgage-backed securities rated below double-A at September 30, 2011 represented 81% of the total fair value of residential mortgage-backed securities, were comprised primarily of sub-prime and Alt-A securities, and had a total amortized cost and fair value of $179.7 million and $149.2 million, respectively. Securities classified as “other asset-backed” at September 30, 2011 were predominantly floating rate with average lives less than 5 years, and 100% were rated triple-A.

Unrealized losses of $13.4 million related to government sponsored agency securities are primarily attributable to changes in market rates since their purchase. The majority of the $12.7 million of unrealized losses in securities classified as “other” at September 30, 2011 relate to securities which Northern Trust purchases for compliance with the Community Reinvestment Act (CRA). Unrealized losses on these CRA related other securities are attributable to their purchase at 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 $9.8 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. Unrealized losses of $2.4 million within corporate debt securities primarily reflect widened credit spreads; 74% of the corporate debt portfolio is backed by guarantees provided by U.S. and non-U.S. governmental entities. The remaining unrealized losses on Northern Trust’s securities portfolio as of September 30, 2011 are attributable to changes in overall market interest rates, increased credit spreads, or reduced market liquidity.

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 which 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 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 to earnings equal to the difference between the two amounts.

Expected losses on 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 developing the expected loss on non-agency residential mortgage-backed securities vary by year of origination and type of collateral. As of September 30, 2011, the expected losses on subprime, Alt-A, prime and 2nd lien 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. September 30, 2011 amortized cost, weighted average ultimate default rates, and loss severity rates for the non-agency residential mortgage-backed securities portfolio, by security type, are provided in the following table.

(In Millions)	September 30, 2011
						Loss Severity Rates
Security Type	Amortized Cost		Weighted Average Ultimate Default Rates			Low			High			Weighted Average
Prime	$	24.4		16.1	%		39.4	%		66.0	%		51.8	%
Alt-A		35.4		41.9			57.9			71.7			68.5
Subprime		120.4		51.1			68.8			86.0			74.4
2nd Lien		35.6		33.1			98.8			100.0			99.5
Total Non-Agency Residential Mortgage-Backed Securities	$	215.8		42.4	%		39.4	%		100.0	%		75.0	%

During the three and nine months ended September 30, 2011, performance metrics specific to subprime and Alt-A loans remained weak resulting in the recognition of OTTI losses of $1.3 million and $23.3 million, respectively, in connection with residential mortgage-backed securities. OTTI losses totaled $14.0 million and $14.1 million for the three and nine months ended September 30, 2010, respectively.

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, 2011 and 2010.

	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2011			2010			2011			2010
Changes in OTTI Losses*	$	.5		$	7.3		$	(1.1	)	$	6.6
Noncredit-related Losses Recorded in / (Reclassified from) OCI**		(1.8	)		(21.3	)		(22.2	)		(20.7	)
Net Impairment Losses Recognized in Earnings	$	(1.3	)	$	(14.0	)	$	(23.3	)	$	(14.1	)

* 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.

** 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)	2011			2010		2011			2010
Cumulative Credit-Related Losses on Securities Held – Beginning of Period	$	116.2		$	73.1	$	94.2		$	73.0
Plus: Losses on Newly Identified Impairements		—			.1		1.5			.1
Additional Losses on Previously Identified Impairements		1.3			13.9		21.8			14.0
Less: Losses on Securities Sold During the Period		(49.3	)		—		(49.3	)		—
Cumulative Credit-Related Losses on Securities Held – End of Period	$	68.2		$	87.1	$	68.2		$	87.1

The table below provides information regarding debt securities held as of September 30, 2011 and December 31, 2010, for which an OTTI loss had been recognized in the current period or previously.

(In Millions)	September 30, 2011			December 31, 2010
Fair Value	$	77.9		$	79.9
Amortized Cost Basis		99.9			113.3
Noncredit-related Losses Recognized in OCI		(22.0	)		(33.4	)
Tax Effect		8.1			12.2
Amount Recorded in OCI	$	(13.9	)	$	(21.2	)

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2011

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.

The estimated credit risk associated with derivative instruments relates to the failure of the counterparty and the failure of Northern Trust to pay based on the contractual terms of the agreement, and is generally limited to the unrealized fair value gains and losses on these instruments, respectively. 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. This 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 Annex agreements are currently in place with a number of 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 on 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 agreements exist between Northern Trust and the counterparty. Derivative assets and liabilities recorded on the consolidated balance sheet were each reduced by $2.1 billion as of September 30, 2011 and by $1.8 billion as of December 31, 2010, as a result of master netting agreements in place. Derivative assets and liabilities recorded at September 30, 2011 also reflect reductions of $.1 billion and $1.6 billion, respectively, as a result of cash collateral received from and deposited with derivative counterparties. This compares with reductions of derivative assets and liabilities of $2.6 billion and $3.0 billion, respectively, at December 31, 2010. Additional cash collateral received from and deposited with derivative counterparties totaling $2.8 million and $185.2 million, respectively, as of September 30, 2011, and $9.9 million and $.5 million, respectively, as of December 31, 2010, were not offset against derivative assets and liabilities on the consolidated balance sheet as the amounts exceeded the net derivative positions with those counterparties.

Certain master netting agreements 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 the 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 $.5 billion and $3.3 billion on September 30, 2011 and December 31, 2010, respectively. Cash collateral amounts deposited with derivative counterparties on those dates included $.4 billion and $2.9 billion, respectively, posted against these liabilities, resulting in a net maximum amount of termination payments that could have been required at September 30, 2011 and December 31, 2010 of $.1 million and $387.1 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, option, and forward 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 utilizes 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 consist of caps, floors, and swaptions, and provide for the transfer or reduction of interest rate risk 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 option contracts for risk management purposes. Northern Trust enters into interest rate forward contracts to lend funds to a potential borrower at a specified interest rate within a specified period of time. These forward contracts are derivative instruments if the loans that will result from the exercise of the commitments will be held for sale.

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. In excess of 97% of Northern Trust’s derivatives outstanding at September 30, 2011 and December 31, 2010, 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 amounts 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, 2011						December 31, 2010
	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	270,614.5	$	5,202.9	$	5,190.0	$	242,007.1	$	5,747.9	$	5,729.9
Interest Rate Option Contracts		100.7		—		—		126.1		.1		.1
Interest Rate Swap Contracts		4,468.9		193.6		189.5		4,301.7		151.2		148.4
Total	$	275,184.1	$	5,396.5	$	5,379.5	$	246,434.9	$	5,899.2	$	5,878.4

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, 2011 and 2010.

	Location of	Amount of Derivative Gain/(Loss) Recognized in Income
	Derivative Gain/ (Loss) Recognized	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	in Income	2011		2010		2011		2010
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	87.2	$	89.0	$	252.8	$	284.0
Interest Rate Swap and Option Contracts	Security Commissions and Trading Income		1.0		3.0		3.9		5.7
Total		$	88.2	$	92.0	$	256.7	$	289.7

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, therefore, are accounted for as trading instruments.

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 expected to occur, 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 designated as hedges and used by Northern Trust to manage risk, their notional and fair values, and the respective risks addressed.

			September 30, 2011						December 31, 2010
	Derivative	Risk	Notional		Fair Value				Notional		Fair Value
(In Millions)	Instrument	Classification	Value		Asset		Liability		Value		Asset		Liability
Fair Value Hedges
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate	$	1,682.0	$	2.0	$	42.3	$	860.0	$	4.8	$	14.9
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Rate		1,100.0		152.4		.4		1,100.0		129.8		.4
Cash Flow Hedges
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		923.9		11.1		18.5		935.3		19.3		15.2
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate		500.0		—		.1		—		—		—
Net Investment Hedges
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		1,452.3		3.7		3.1		1,390.1		13.0		18.3
Total			$	5,658.2	$	169.2	$	64.4	$	4,285.4	$	166.9	$	48.8

In addition to the above, Sterling denominated debt, totaling $240.7 million and $241.8 million at September 30, 2011 and December 31, 2010, 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, 2011 and 2010.

			Amount of Derivative Gain/(Loss) Recognized in Income
	Derivative	Location of Derivative Gain/(Loss) Recognized	Three Months Ended September 30,						Nine Month Ended September 30,
(In Millions)	Instrument	in Income	2011			2010			2011			2010
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Income	$	(27.0	)	$	(10.2	)	$	(53.2	)	$	(21.8	)
Senior Notes and Long -Term Subordinated Debt	Interest Rate Swap Contracts	Interest Expense		39.0			33.3			190.4			104.5
Total			$	12.0		$	23.1		$	137.2		$	82.7

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 were $.1 million and $.2 million of changes recorded in the fair values of the hedged items for such “long-haul” hedges during the three months ended

September 30, 2011 and 2010; and $.4 million and $.2 million changes recorded in the fair value during the nine months ended September 30, 2011 and 2010, respectively. There was $.1 million and $.4 million of ineffectiveness recorded during the three and nine months ended September 30, 2011, respectively, and $.1 million ineffectiveness recorded during the three months and nine months ended September 30, 2010 for available for sale investment securities, senior notes, and subordinated debt.

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 to the accounting for the hedged item. When the hedged forecasted transaction impacts earnings, balances in AOCI are reclassified to the same income or expense classification as the hedged item. Northern Trust assesses effectiveness using regression analysis for cash flow hedges of available for sale securities. Ineffectiveness is measured using the hypothetical derivative method. For cash flow hedges of 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. 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, 2011 and 2010. As of September 30, 2011, twenty-three 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 table provides 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, 2011 and 2010.

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)
Three Months Ended September 30,	2011			2010			2011		2010
Net Gain/(Loss) Recognized in AOCI	$	(24.8	)	$	43.2		$	.2	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Trust, Investment and Other Servicing Fees		.7			.4			—		—
Other Operating Income		(.2	)		(.1	)		—		—
Interest Income		(.2	)		(.1	)		.1		—
Interest Expense		—			—			—		—
Compensation		.6			.1			—		—
Employee Benefits		.2			.1			—		—
Equipment and Software		—			—			—		—
Occupancy Expense		.1			.2			—		—
Other Operating Expense		.6			(1.5	)		—		—
Total	$	1.8		$	(.9	)	$	.1	$	—

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)
Nine Months Ended September 30,	2011			2010			2011		2010
Net Gain/(Loss) Recognized in AOCI	$	(9.0	)	$	56.9		$	.2	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Trust, Investment and Other Servicing Fees		1.0			10.2			—		—
Other Operating Income		0			.3			—		—
Interest Income		(1.0	)		2.0			.1		—
Interest Expense		—			.1			—		—
Compensation		3.0			(8.4	)		—		—
Employee Benefits		.9			(2.2	)		—		—
Equipment and Software		.1			(.1	)		—		—
Occupancy Expense		.5			(1.1	)		—		—
Other Operating Expense		1.9			(4.5	)		—		—
Total	$	6.4		$	(3.7	)	$	.1	$	—

During the three and nine months ended September 30, 2011 there were no transactions discontinued due to the original forecasted transactions no longer being probable of occurring. During the three and nine months ended September 30, 2010, $6.3 million of net foreign exchange contract losses were reclassified into earnings as a result of the discontinuance of cash flow hedges as it was no longer probable that the original forecasted transactions would occur. It is estimated that a net loss of $4.8 million will be reclassified into earnings within the next twelve months relating to cash flow hedges.

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 eliminate hedge ineffectiveness. As a result, no ineffectiveness was recorded for these hedges during the three and nine months ended September 30, 2011 and 2010. 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, 2011 and 2010.

	Amount of Hedging Gain/(Loss) Recognized in OCI (Before Tax)
	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	2011		2010			2011			2010
Foreign Exchange Contracts	$	75.6	$	(109.1	)	$	(1.9	)	$	29.6
Sterling Denominated Subordinated Debt		5.7		(6.9	)		(2.2	)		3.5
Sterling Denominated Senior Debt		—		(5.8	)		—			10.5
Total	$	81.3	$	(121.8	)	$	(4.1	)	$	43.6

Derivatives not formally designated as hedges under GAAP are entered into to manage the foreign currency risk of non-U.S. dollar denominated assets and liabilities and the credit risk and interest rate risk of loans and loan commitments. The following table identifies the types and classifications of risk management derivative instruments not formally designated as hedges, their notional and fair values, and the respective risks addressed.

			September 30, 2011						December 31, 2010
	Derivative	Risk	Notional		Fair Value				Notional		Fair Value
(In Millions)	Instrument	Classification	Value		Asset		Liability		Value		Asset		Liability
Commercial Loans and Loan Commitments	Credit Default Swap Contracts	Credit	$	85.5	$	—	$	0.4	$	149.5	$	—	$	2.8
Loan Commitments	Forward Contracts	Interest Rate		1.1		—		—		14.3		.5		.2
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		194.1		4.2		5.1		616.1		12.3		16.2
Commercial Loans	Foreign Exchange Contracts	Foreign Currency		141.9		4.2		.1		60.6		.1		.9
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		57.2		.5		—		61.3		.2		.8
Total			$	479.8	$	8.9	$	5.6	$	901.8	$	13.1	$	20.9

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, 2011 and 2010.

	Location of Derivative Gain/	Amount of Derivative Gain/(Loss) Recognized in Income
	(Loss) Recognized	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	in Income	2011		2010			2011			2010
Credit Default Swap Contracts	Other Operating Income	$	1.1	$	(1.6	)	$	.3		$	(1.2	)
Forward Contracts	Other Operating Income		—		—			.2			—
Foreign Exchange Contracts	Other Operating Income		6.1		(14.7	)		(5.8	)		(8.1	)
Total		$	7.2	$	(16.3	)	$	(5.3	)	$	(9.3	)

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Changes in Level 3 Assets (Detail) (Auction Rate, USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Auction Rate
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Assets Beginning Balance	$ 205.1	$ 384.9	$ 367.8	$ 427.7
Total Realized and Unrealized
(Gains) Losses Included in Earnings	(0.6)	(0.3)	(10.2)	(2.9)
Gains (Losses) Included in Other Comprehensive Income	(5.2)	(1.5)	(15.8)	(7.4)
Purchases, Issuances, Sales, and Settlements
Sales			(1.5)	(0.3)
Settlements	(9.7)	(3.1)	(150.7)	(37.1)
Fair Value Assets Ending Balance	$ 189.6	$ 380.0	$ 189.6	$ 380.0

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Pension and Other Postretirement Plans (Tables)

9 Months Ended

Sep. 30, 2011

Net Periodic Pension Expense of Northern Trust's U.S. and Non-U.S. Pension Plans, Supplemental Pension Plan, and Other Postretirement Plan

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, 2011 and 2010.

Net Periodic Pension Expense

U.S. Plan

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(In Millions)	2011			2010			2011			2010
Service Cost	$	10.7		$	9.5		$	32.1		$	28.5
Interest Cost		10.2			9.2			30.6			27.6
Expected Return on Plan Assets		(19.7	)		(18.3	)		(59.1	)		(54.9	)
Amortization
Net Loss		6.5			5.0			19.5			15.0
Prior Service Cost		.4			.4			1.2			1.2
Net Periodic Pension Expense	$	8.1		$	5.8		$	24.3		$	17.4

Net Periodic Pension Expense

Non U.S. Plans

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(In Millions)	2011			2010			2011			2010
Service Cost	$	—		$	.2		$	—		$	1.8
Interest Cost		1.6			1.9			4.9			5.2
Expected Return on Plan Assets		(2.1	)		(2.3	)		(6.2	)		(6.2	)
Net Loss Amortization		.1			.1			.1			.5
Gain on Curtailment of Non-U.S. Plan		—			—			—			(2.2	)
Net Periodic Pension Benefit	$	(.4	)	$	(.1	)	$	(1.2	)	$	(.9	)

Net Periodic Pension Expense

Supplemental Plan

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions)	2011		2010		2011		2010
Service Cost	$	.8	$	.8	$	2.4	$	2.4
Interest Cost		1.1		1.2		3.3		3.6
Amortization
Net Loss		1.4		1.5		4.2		4.5
Prior Service Cost		.1		—		.3		—
Net Periodic Pension Expense	$	3.4	$	3.5	$	10.2	$	10.5

Net Periodic Benefit Expense

Other Postretirement Plan

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
(In Millions)	2011			2010			2011			2010
Service Cost	$	.1		$	.2		$	.3		$	.6
Interest Cost		.7			.7			2.1			2.1
Amortization
Net Loss		.4			.5			1.2			1.5
Prior Service Cost		(1.3	)		(1.3	)		(3.9	)		(3.9	)
Net Periodic Benefit Expense (Benefit)	$	(.1	)	$	.1		$	(.3	)	$	.3

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Variable Interest Entities

9 Months Ended

Sep. 30, 2011

Variable Interest Entities

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

Leveraged Leases. In leveraged leasing transactions, Northern Trust acts as lessor of the underlying asset subject to the lease and typically funds 20% of the asset’s cost via an equity ownership in a trust with the remaining 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, 2011 and December 31, 2010, the carrying amounts of these investments, which are included in loans and leases in the consolidated balance sheet, were $743.8 million and $782.3 million, respectively. The Corporation’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 the Corporation to a loss.

Tax Credit Structures. Northern Trust invests in affordable housing projects that are designed to generate a return primarily through the realization of tax credits. The affordable housing projects are formed as limited partnerships and LLCs, and Northern Trust typically invests as a limited partner/investor member in the form of equity contributions. The economic performance of the affordable housing projects, which are deemed to be VIEs, is driven by the performance of their underlying investment projects as well as the VIEs’ 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 affordable housing projects as it lacks the power to direct the activities that most significantly impact the economic performance of the underlying project or to affect the VIEs’ 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 affordable housing projects is limited to the carrying amounts of its investments, including any unfunded commitments. As of September 30, 2011 and December 31, 2010, the carrying amounts of these investments, which are included in other assets in the consolidated balance sheet, were $252.3 million and $265.4 million, respectively. As of September 30, 2011 and December 31, 2010, liabilities related to unfunded commitments, which are included in other liabilities in the consolidated balance sheet, were $35.7 million and $35.5 million, respectively. Northern Trust’s funding requirements are limited to its invested capital and any additional unfunded commitments for future equity contributions. Northern Trust has no other liquidity arrangements or obligations to purchase assets of the affordable housing projects that would expose it to a loss.

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 the 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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Business Units

9 Months Ended

Sep. 30, 2011

Business Units

9. 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, 2011 and 2010.

Three Months Ended	Corporate and						Personal Financial						Treasury and						Total
September 30,	Institutional Services						Services						Other						Consolidated
($ In Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Noninterest Income
Trust, Investment and Other Servicing Fees	$	310.9		$	293.2		$	244.4		$	225.5		$	—		$	—		$	555.3		$	518.7
Other		125.0			114.9			30.7			33.3			3.7			(10.9	)		159.4			137.3
Net Interest Income (FTE)*		71.2			67.2			157.1			151.0			38.3			24.8			266.6			243.0
Revenues*		507.1			475.3			432.2			409.8			42.0			13.9			981.3			899.0
Provision for Credit Losses		(1.9	)		(2.8	)		19.4			32.8			—			—			17.5			30.0
Noninterest Expenses		375.8			330.6			300.6			274.6			24.8			16.9			701.2			622.1
Income before Income Taxes*		133.2			147.5			112.2			102.4			17.2			(3.0	)		262.6			246.9
Provision for Income Taxes*		50.3			51.9			44.5			39.0			(2.6	)		.4			92.2			91.3
Net Income	$	82.9		$	95.6		$	67.7		$	63.4		$	19.8		$	(3.4	)	$	170.4			155.6
Percentage of Consolidated Net Income		49	%		61	%		40	%		41	%		11	%		(2	)%		100	%		100	%
Average Assets	$	49,755.5		$	38,701.2		$	23,809.5		$	23,495.9		$	20,464.7		$	12,509.6		$	94,029.7		$	74,706.7

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $9.8 million for 2011 and $9.5 million for 2010.

Nine Months Ended	Corporate and						Personal Financial						Treasury and						Total
September 30,	Institutional Services						Services						Other						Consolidated
($ In Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Noninterest Income
Trust, Investment and Other Servicing Fees	$	890.7		$	906.5		$	737.3		$	670.8		$	—		$	—		$	1,628.0		$	1,577.3
Other		373.8			384.9			94.9			100.0			(19.7	)		(7.3	)		449.0			477.6
Net Interest Income (FTE)*		199.1			207.9			456.6			439.3			112.4			78.3			768.1			725.5
Revenues*		1,463.6			1,499.3			1,288.8			1,210.1			92.7			71.0			2,845.1			2,780.4
Provision for Credit Losses		(18.8	)		(11.3	)		61.3			131.3			—			—			42.5			120.0
Noninterest Expenses		1,096.2			977.9			893.3			814.1			70.0			64.2			2,059.5			1,856.2
Income before Income Taxes*		386.2			532.7			334.2			264.7			22.7			6.8			743.1			804.2
Provision for Income Taxes*		147.4			187.7			132.7			100.5			(10.4	)		3.6			269.7			291.8
Net Income	$	238.8		$	345.0		$	201.5		$	164.2		$	33.1		$	3.2		$	473.4			512.4
Percentage of Consolidated Net Income		50	%		67	%		43	%		32	%		7	%		1	%		100	%		100	%
Average Assets	$	47,079.8		$	37,775.9		$	23,696.1		$	23,527.4		$	19,148.3		$	13,322.8		$	89,924.2		$	74,626.1

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $30.8 million for 2011 and $28.8 million for 2010.

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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CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash Flows from Operating Activities:
Net Income	$ 473.4	$ 512.4
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Investment Security Losses, net	24.1	13.3
Amortization and Accretion of Securities and Unearned Income	(19.2)	(40.9)
Provision for Credit Losses	42.5	120.0
Depreciation on Buildings and Equipment	67.7	70.3
Amortization of Computer Software	117.4	101.2
Amortization of Intangibles	11.5	11.0
Qualified Pension Plan Contribution	(10.6)	(20.0)
Visa Indemnification Benefit	(10.1)	(12.7)
(Increase) Decrease in Receivables	104.5	(115.8)
Increase (Decrease) in Interest Payable	1.6	(6.0)
Net Change in Derivative Fair Value, Including Required Collateral	(1,204.2)	328.8
Other Operating Activities, net	264.4	(42.2)
Net Cash Provided by (Used In) Operating Activities	(137.0)	919.4
Cash Flows from Investing Activities:
Net Increase in Federal Funds Sold and Securities Purchased under Agreements to Resell	(61.6)	(178.7)
Net Increase in Interest-Bearing Deposits with Banks	(3,592.8)	(3,195.3)
Net Decrease in Federal Reserve Deposits and Other Interest-Bearing Assets	4,438.0	8,633.0
Purchases of Securities - Held to Maturity	(101.5)	(382.4)
Proceeds from Maturity and Redemption of Securities - Held to Maturity	195.9	377.2
Purchases of Securities - Available for Sale	(24,888.1)	(11,429.2)
Proceeds from Sale, Maturity and Redemption of Securities - Available for Sale	16,484.0	8,774.0
Net Increase in Loans and Leases	(634.9)	(166.6)
Purchases of Buildings and Equipment, net	(55.1)	(58.6)
Purchases and Development of Computer Software	(219.8)	(152.7)
Net (Increase) Decrease in Client Security Settlement Receivables	(246.9)	90.5
Decrease in Cash Due to Acquisitions, net of Cash Acquired	(172.6)
Other Investing Activities, net	(60.9)	(6.8)
Net Cash Provided by (Used in) Investing Activities	(8,916.3)	2,304.4
Cash Flows from Financing Activities:
Net Increase in Deposits	14,318.3	164.6
Net Decrease in Federal Funds Purchased	(2,953.9)	(1,844.6)
Net Decrease in Securities Sold under Agreements to Repurchase	(615.1)	(332.1)
Net Increase (Decrease) in Short-Term Other Borrowings	522.3	(503.9)
Proceeds from Term Federal Funds Purchased	7,959.9	17,208.3
Repayments of Term Federal Funds Purchased	(7,979.0)	(16,581.3)
Proceeds from Senior Notes and Long-Term Debt	500.0	642.7
Repayments of Senior Notes and Long-Term Debt	(879.8)	(917.6)
Treasury Stock Purchased	(77.7)	(6.0)
Net Proceeds from Stock Options	58.7	57.1
Cash Dividends Paid on Common Stock	(205.5)	(204.6)
Other Financing Activities, net		1.1
Net Cash Provided by (Used in) Financing Activities	10,648.2	(2,316.3)
Effect of Foreign Currency Exchange Rates on Cash	(76.3)	90.2
Increase in Cash and Due from Banks	1,518.6	997.7
Cash and Due from Banks at Beginning of Year	2,818.0	2,491.8
Cash and Due from Banks at End of Period	4,336.6	3,489.5
Supplemental Disclosures of Cash Flow Information:
Interest Paid	314.9	271.7
Income Taxes Paid	123.6	136.7
Transfers from Loans to OREO	$ 57.5	$ 24.5

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Accumulated Other Comprehensive Income (Loss) (Tables)

9 Months Ended

Sep. 30, 2011

Components of Accumulated Other Comprehensive Income (Loss)

The following tables summarize the components of accumulated other comprehensive income (loss) at September 30, 2011 and 2010, and changes during the three and nine month periods then ended.

	Three Months Ended September 30, 2011												Three Months Ended September 30, 2010
	Beginning									Ending			Beginning									Ending
	Balance									Balance			Balance									Balance
	(Net of			Before Tax			Tax			(Net of			(Net of			Before Tax			Tax			(Net of
(In Millions)	Tax)			Amount			Effect			Tax)			Tax)			Amount			Effect			Tax)
Noncredit-Related Unrealized Losses on Securities OTTI	$	(13.6	)	$	(.4	)	$	.1		$	(13.9	)	$	(35.1	)	$	18.7		$	(6.9	)	$	(23.3	)
Other Unrealized Gains (Losses) on Securities Available for Sale, net		27.6			32.5			(12.3	)		47.8			14.0			(9.9	)		3.8			7.9
Reclassification Adjustments		6.3			2.3			(.8	)		7.8			(.2	)		13.5			(5.1	)		8.2
Net Unrealized Gains (Losses) on Securities Available for Sale		20.3			34.4			(13.0	)		41.7			(21.3	)		22.3			(8.2	)		(7.2	)
Unrealized Gains (Losses) on Cash Flow Hedge Designations		21.3			(24.6	)		9.2			5.9			(17.6	)		43.2			(15.9	)		9.7
Reclassification Adjustments		(2.9	)		(1.9	)		.7			(4.1	)		1.8			7.1			(2.6	)		6.3
Net Unrealized Gains (Losses) on Cash Flow Hedge Designations		18.4			(26.5	)		9.9			1.8			(15.8	)		50.3			(18.5	)		16.0
Foreign Currency Translation Adjustments		2.4			31.2			(30.0	)		3.6			14.3			(44.2	)		44.7			14.8
Pension and Other Postretirement Benefit Adjustments		(296.4	)		—			—			(296.4	)		(303.3	)		—			—			(303.3	)
Reclassification Adjustments		12.0			7.6			(2.8	)		16.8			10.8			6.1			(3.3	)		13.6
Total Pension and Other Postretirement Benefit Adjustments		(284.4	)		7.6			(2.8	)		(279.6	)		(292.5	)		6.1			(3.3	)		(289.7	)
Accumulated Other Comprehensive Income (Loss)	$	(243.3	)	$	46.7		$	(35.9	)	$	(232.5	)	$	(315.3	)	$	34.5		$	14.7		$	(266.1	)

	Nine Months Ended September 30, 2011												Nine Months Ended September 30, 2010
	Beginning									Ending			Beginning								Ending
	Balance									Balance			Balance								Balance
	(Net of			Before Tax			Tax			(Net of			(Net of			Before Tax		Tax			(Net of
(In Millions)	Tax)			Amount			Effect			Tax)			Tax)			Amount		Effect			Tax)
Noncredit-Related Unrealized Losses on Securities OTTI	$	(21.2	)	$	11.5		$	(4.2	)	$	(13.9	)	$	(42.0	)	$	29.6	$	(10.9	)	$	(23.3	)
Other Unrealized Gains (Losses) on Securities Available for Sale, net		7.7			64.2			(24.1	)		47.8			.3			11.9		(4.3	)		7.9
Reclassification Adjustments		—			12.4			(4.6	)		7.8			—			13.1		(4.9	)		8.2
Net Unrealized Gains (Losses) on Securities Available for Sale		(13.5	)		88.1			(32.9	)		41.7			(41.7	)		54.6		(20.1	)		(7.2	)
Unrealized Gains (Losses) on Cash Flow Hedge Designations		11.4			(8.8	)		3.3			5.9			(26.2	)		56.9		(21.0	)		9.7
Reclassification Adjustments		—			(6.5	)		2.4			(4.1	)		—			9.9		(3.6	)		6.3
Net Unrealized Gains (Losses) on Cash Flow Hedge Designations		11.4			(15.3	)		5.7			1.8			(26.2	)		66.8		(24.6	)		16.0
Foreign Currency Translation Adjustments		(7.0	)		19.7			(9.1	)		3.6			11.3			19.5		(16.0	)		14.8
Pension and Other Postretirement Benefit Adjustments		(296.2	)		(.3	)		.1			(296.4	)		(305.0	)		2.2		(.5	)		(303.3	)
Reclassification Adjustments		—			22.6			(5.8	)		16.8			—			18.7		(5.1	)		13.6
Total Pension and Other Postretirement Benefit Adjustments		(296.2	)		22.3			(5.7	)		(279.6	)		(305.0	)		20.9		(5.6	)		(289.7	)
Accumulated Other Comprehensive Income (Loss)	$	(305.3	)	$	114.8		$	(42.0	)	$	(232.5	)	$	(361.6	)	$	161.8	$	(66.3	)	$	(266.1	)

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Allowance for Credit Losses

9 Months Ended

Sep. 30, 2011

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, unfunded 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.

Northern Trust’s Loan Loss Allowance Committee assesses a common set of qualitative factors in establishing the inherent portion of the allowance for credit losses for 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 reserve. 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 unfunded 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 reserve 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 the changes in the allowance for credit losses by segment during the three and nine month periods ended September 30, 2011 and 2010.

	Three Months Ended September 30,
	2011									2010
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	239.9		$	105.9		$	345.8		$	265.3		$	96.3		$	361.6
Charge-Offs		(16.8	)		(18.1	)		(34.9	)		(17.5	)		(14.3	)		(31.8	)
Recoveries		4.4			1.9			6.3			.8			.7			1.5
Net Charge-Offs		(12.4	)		(16.2	)		(28.6	)		(16.7	)		(13.6	)		(30.3	)
Provision for Credit Losses		(6.4	)		23.9			17.5			12.6			17.4			30.0
Effect of Foreign Exchange Rates		(.1	)		—			(.1	)		.1			—			.1
Balance at End of Period	$	221.0		$	113.6		$	334.6		$	261.3		$	100.1		$	361.4

	Nine Months Ended September 30,
	2011									2010
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	256.7		$	100.6		$	357.3		$	252.2		$	88.4		$	340.6
Charge-Offs		(45.0	)		(42.5	)		(87.5	)		(61.7	)		(43.1	)		(104.8	)
Recoveries		17.5			4.8			22.3			2.9			2.7			5.6
Net Charge-Offs		(27.5	)		(37.7	)		(65.2	)		(58.8	)		(40.4	)		(99.2	)
Provision for Credit Losses		(8.2	)		50.7			42.5			67.9			52.1			120.0
Effect of Foreign Exchange Rates		—			—			—			—			—			—
Balance at End of Period	$	221.0		$	113.6		$	334.6		$	261.3		$	100.1		$	361.4

The following tables provide information regarding the balances of the recorded investments in loans and leases and the allowance for credit losses by segment as of September 30, 2011 and December 31, 2010.

	September 30, 2011						December 31, 2010
(In Millions)	Commercial		Personal		Total		Commercial		Personal		Total
Loans and Leases
Specifically Evaluated for Impairment	$	132.0	$	156.9	$	288.9	$	180.5	$	120.7	$	301.2
Evaluated for Inherent Impairment		12,087.3		16,315.2		28,402.5		11,432.9		16,397.9		27,830.8
Total Loans and Leases		12,219.3		16,472.1		28,691.4		11,613.4		16,518.6		28,132.0
Allowance for Loans and Leases
Specifically Evaluated for Impairment		29.1		5.7		34.8		49.3		2.4		51.7
Evaluated for Inherent Impairment		157.3		106.2		263.5		171.4		96.5		267.9
Allowance Assigned to Loans and Leases		186.4		111.9		298.3		220.7		98.9		319.6
Allowance for Unfunded Exposures
Commitments and Standby Letters of Credit		34.6		1.7		36.3		36.0		1.7		37.7
Total Allowance for Credit Losses	$	221.0	$	113.6	$	334.6	$	256.7	$	100.6	$	357.3

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Net Income Per Common Share Computations

9 Months Ended

Sep. 30, 2011

Net Income Per Common Share Computations

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions Except Share Information)	2011		2010		2011		2010
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding		240,991,491		242,124,461		241,529,793		241,966,279
Net Income	$	170.4	$	155.6	$	473.4	$	512.4
Net Income Applicable to Common Stock		170.4		155.6		473.4		512.4
Less: Earnings Allocated to Participating Securities		2.0		1.3		5.5		4.2
Earnings Allocated to Common Shares Outstanding	$	168.4	$	154.3	$	467.9	$	508.2
Basic Net Income Per Common Share		.70		.64		1.94		2.10
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding		240,991,491		242,124,461		241,529,793		241,966,279
Plus Stock Option Dilution		202,502		33,966		488,957		455,382
Average Common and Potential Common Shares		241,193,993		242,158,427		242,018,750		242,421,661
Earnings Allocated to Common and Potential Common Shares	$	168.4	$	154.3	$	467.9	$	508.2
Diluted Net Income Per Common Share		.70		.64		1.93		2.10

Note: Common stock equivalents totaling 15,650,249 and 12,420,777 for the three and nine months ended September 30, 2011, respectively, and 6,860,298 and 7,958,582 for the three and nine months ended September 30, 2010, respectively, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive.

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Components of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended						3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Noncredit Related Unrealized Losses on Securities OTTI	Sep. 30, 2010 Noncredit Related Unrealized Losses on Securities OTTI	Sep. 30, 2011 Noncredit Related Unrealized Losses on Securities OTTI	Sep. 30, 2010 Noncredit Related Unrealized Losses on Securities OTTI	Sep. 30, 2011 Other Accumulated Net Unrealized Investment Gain Loss Before Reclassification Adjustments	Sep. 30, 2010 Other Accumulated Net Unrealized Investment Gain Loss Before Reclassification Adjustments	Sep. 30, 2011 Other Accumulated Net Unrealized Investment Gain Loss Before Reclassification Adjustments	Sep. 30, 2010 Other Accumulated Net Unrealized Investment Gain Loss Before Reclassification Adjustments	Sep. 30, 2011 Accumulated Net Unrealized Investment Gain (Loss), Reclassification Adjustments	Sep. 30, 2010 Accumulated Net Unrealized Investment Gain (Loss), Reclassification Adjustments	Sep. 30, 2011 Accumulated Net Unrealized Investment Gain (Loss), Reclassification Adjustments	Sep. 30, 2010 Accumulated Net Unrealized Investment Gain (Loss), Reclassification Adjustments	Sep. 30, 2011 Accumulated Net Unrealized Investment Gain (Loss)	Sep. 30, 2010 Accumulated Net Unrealized Investment Gain (Loss)	Sep. 30, 2011 Accumulated Net Unrealized Investment Gain (Loss)	Sep. 30, 2010 Accumulated Net Unrealized Investment Gain (Loss)	Sep. 30, 2011 Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges, Before Reclassification Adjustments	Sep. 30, 2010 Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges, Before Reclassification Adjustments	Sep. 30, 2011 Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges, Before Reclassification Adjustments	Sep. 30, 2010 Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges, Before Reclassification Adjustments	Sep. 30, 2011 Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges, Reclassification Adjustments	Sep. 30, 2010 Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges, Reclassification Adjustments	Sep. 30, 2011 Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges, Reclassification Adjustments	Sep. 30, 2010 Accumulated Net Gain (Loss) From Designated Or Qualifying Cash Flow Hedges, Reclassification Adjustments	Sep. 30, 2011 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges	Sep. 30, 2010 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges	Sep. 30, 2011 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges	Sep. 30, 2010 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges	Sep. 30, 2011 Accumulated Translation Adjustment	Sep. 30, 2010 Accumulated Translation Adjustment	Sep. 30, 2011 Accumulated Translation Adjustment	Sep. 30, 2010 Accumulated Translation Adjustment	Sep. 30, 2011 Accumulated Defined Benefit Plans Adjustment, Before Reclassification Adjustments	Sep. 30, 2010 Accumulated Defined Benefit Plans Adjustment, Before Reclassification Adjustments	Jun. 30, 2011 Accumulated Defined Benefit Plans Adjustment, Before Reclassification Adjustments	Jun. 30, 2010 Accumulated Defined Benefit Plans Adjustment, Before Reclassification Adjustments	Sep. 30, 2011 Accumulated Defined Benefit Plans Adjustment, Reclassification Adjustments	Sep. 30, 2010 Accumulated Defined Benefit Plans Adjustment, Reclassification Adjustments	Sep. 30, 2011 Accumulated Defined Benefit Plans Adjustment, Reclassification Adjustments	Sep. 30, 2010 Accumulated Defined Benefit Plans Adjustment, Reclassification Adjustments	Sep. 30, 2011 Accumulated Defined Benefit Plans Adjustment	Sep. 30, 2010 Accumulated Defined Benefit Plans Adjustment	Sep. 30, 2011 Accumulated Defined Benefit Plans Adjustment	Sep. 30, 2010 Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance (Net of Tax)	$ (243.3)	$ (315.3)	$ (305.3)	$ (361.6)	$ (13.6)	$ (35.1)	$ (21.2)	$ (42.0)	$ 27.6	$ 14.0	$ 7.7	$ 0.3	$ 6.3	$ (0.2)			$ 20.3	$ (21.3)	$ (13.5)	$ (41.7)	$ 21.3	$ (17.6)	$ 11.4	$ (26.2)	$ (2.9)	$ 1.8			$ 18.4	$ (15.8)	$ 11.4	$ (26.2)	$ 2.4	$ 14.3	$ (7.0)	$ 11.3	$ (296.2)	$ (305.0)	$ (296.4)	$ (303.3)	$ 12.0	$ 10.8			$ (284.4)	$ (292.5)	$ (296.2)	$ (305.0)
Period Change Before Tax Amount	46.7	34.5	114.8	161.8	(0.4)	18.7	11.5	29.6	32.5	(9.9)	64.2	11.9	2.3	13.5	12.4	13.1	34.4	22.3	88.1	54.6	(24.6)	43.2	(8.8)	56.9	(1.9)	7.1	(6.5)	9.9	(26.5)	50.3	(15.3)	66.8	31.2	(44.2)	19.7	19.5	(0.3)	2.2			7.6	6.1	22.6	18.7	7.6	6.1	22.3	20.9
Period Change Tax Effect	(35.9)	14.7	(42.0)	(66.3)	0.1	(6.9)	(4.2)	(10.9)	(12.3)	3.8	(24.1)	(4.3)	(0.8)	(5.1)	(4.6)	(4.9)	(13.0)	(8.2)	(32.9)	(20.1)	9.2	(15.9)	3.3	(21.0)	0.7	(2.6)	2.4	(3.6)	9.9	(18.5)	5.7	(24.6)	(30.0)	44.7	(9.1)	(16.0)	0.1	(0.5)			(2.8)	(3.3)	(5.8)	(5.1)	(2.8)	(3.3)	(5.7)	(5.6)
Ending Balance (Net of Tax)	$ (232.5)	$ (266.1)	$ (232.5)	$ (266.1)	$ (13.9)	$ (23.3)	$ (13.9)	$ (23.3)	$ 47.8	$ 7.9	$ 47.8	$ 7.9	$ 7.8	$ 8.2	$ 7.8	$ 8.2	$ 41.7	$ (7.2)	$ 41.7	$ (7.2)	$ 5.9	$ 9.7	$ 5.9	$ 9.7	$ (4.1)	$ 6.3	$ (4.1)	$ 6.3	$ 1.8	$ 16.0	$ 1.8	$ 16.0	$ 3.6	$ 14.8	$ 3.6	$ 14.8	$ (296.4)	$ (303.3)	$ (296.4)	$ (303.3)	$ 16.8	$ 13.6	$ 16.8	$ 13.6	$ (279.6)	$ (289.7)	$ (279.6)	$ (289.7)

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Pledged Assets

9 Months Ended

Sep. 30, 2011

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. At September 30, 2011, $27.4 billion ($16.4 billion of government sponsored agency and other securities, $458.2 million of obligations of states and political subdivisions, and $10.5 billion of loans) were pledged. This compares to $23.9 billion ($12.8 billion of government sponsored agency and other securities, $576.5 million of obligations of states and political subdivisions, and $10.5 billion of loans) at December 31, 2010. Collateral required for these purposes totaled $4.1 billion and $4.5 billion on September 30, 2011 and December 31, 2010, respectively. Included in the total pledged assets at September 30, 2011 and December 31, 2010 were available for sale securities with a total fair value of $.7 billion and $1.1 billion, 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 permitted to repledge or sell collateral from agreements to resell securities purchased transactions. The total fair value of accepted collateral as of September 30, 2011 and December 31, 2010 was $205.4 million and $152.1 million, respectively. There was no repledged or sold collateral at September 30, 2011 or December 31, 2010.

Deposits maintained to meet Federal Reserve Bank reserve requirements averaged $467.5 million and $307.5 million for the three and nine months ended September 30, 2011, respectively, and averaged $186.4 million and $257.8 million for the three and nine months ended September 30, 2010, respectively.

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Cash Flow Hedge Derivative Gains and Losses Recognized in AOCI and the Amounts Reclassified to Earnings (Detail) (Asset And Liability Management, USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain/(Loss) Recognized in AOCI	$ (24.8)	$ 43.2	$ (9.0)	$ 56.9
Net Gain/(Loss) Reclassified from AOCI to Earnings
Trust, Investment and Other Servicing Fees	0.7	0.4	1.0	10.2
Other Operating Income	(0.2)	(0.1)	0	0.3
Interest Income	(0.2)	(0.1)	(1.0)	2.0
Interest Expense				0.1
Compensation	0.6	0.1	3.0	(8.4)
Employee Benefits	0.2	0.1	0.9	(2.2)
Equipment and Software			0.1	(0.1)
Occupancy Expense	0.1	0.2	0.5	(1.1)
Other Operating Expense	0.6	(1.5)	1.9	(4.5)
Total	1.8	(0.9)	6.4	(3.7)
Interest Rate Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain/(Loss) Recognized in AOCI	0.2		0.2
Net Gain/(Loss) Reclassified from AOCI to Earnings
Interest Income	0.1		0.1
Total	$ 0.1		$ 0.1

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Gains and Losses Recorded in the Consolidated Statement of Income related to Client Related and Trading Derivative Financial Instruments (Detail) (Client Related and Trading, USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ 88.2	$ 92.0	$ 256.7	$ 289.7
Foreign Exchange Contracts | Foreign Exchange Trading Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	87.2	89.0	252.8	284.0
Interest Rate Swap Contracts | Security Commission and Trading Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ 1.0	$ 3.0	$ 3.9	$ 5.7

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Allowance for Credit Losses (Tables)

9 Months Ended

Sep. 30, 2011

Changes in the Allowance for Credit Losses by Segment

The following tables provide information regarding the changes in the allowance for credit losses by segment during the three and nine month periods ended September 30, 2011 and 2010.

	Three Months Ended September 30,
	2011									2010
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	239.9		$	105.9		$	345.8		$	265.3		$	96.3		$	361.6
Charge-Offs		(16.8	)		(18.1	)		(34.9	)		(17.5	)		(14.3	)		(31.8	)
Recoveries		4.4			1.9			6.3			.8			.7			1.5
Net Charge-Offs		(12.4	)		(16.2	)		(28.6	)		(16.7	)		(13.6	)		(30.3	)
Provision for Credit Losses		(6.4	)		23.9			17.5			12.6			17.4			30.0
Effect of Foreign Exchange Rates		(.1	)		—			(.1	)		.1			—			.1
Balance at End of Period	$	221.0		$	113.6		$	334.6		$	261.3		$	100.1		$	361.4

	Nine Months Ended September 30,
	2011									2010
(In Millions)	Commercial			Personal			Total			Commercial			Personal			Total
Balance at Beginning of Period	$	256.7		$	100.6		$	357.3		$	252.2		$	88.4		$	340.6
Charge-Offs		(45.0	)		(42.5	)		(87.5	)		(61.7	)		(43.1	)		(104.8	)
Recoveries		17.5			4.8			22.3			2.9			2.7			5.6
Net Charge-Offs		(27.5	)		(37.7	)		(65.2	)		(58.8	)		(40.4	)		(99.2	)
Provision for Credit Losses		(8.2	)		50.7			42.5			67.9			52.1			120.0
Effect of Foreign Exchange Rates		—			—			—			—			—			—
Balance at End of Period	$	221.0		$	113.6		$	334.6		$	261.3		$	100.1		$	361.4

Allowance for Credit Losses and Recorded Investment in Loans and Leases by Segment

The following tables provide information regarding the balances of the recorded investments in loans and leases and the allowance for credit losses by segment as of September 30, 2011 and December 31, 2010.

	September 30, 2011						December 31, 2010
(In Millions)	Commercial		Personal		Total		Commercial		Personal		Total
Loans and Leases
Specifically Evaluated for Impairment	$	132.0	$	156.9	$	288.9	$	180.5	$	120.7	$	301.2
Evaluated for Inherent Impairment		12,087.3		16,315.2		28,402.5		11,432.9		16,397.9		27,830.8
Total Loans and Leases		12,219.3		16,472.1		28,691.4		11,613.4		16,518.6		28,132.0
Allowance for Loans and Leases
Specifically Evaluated for Impairment		29.1		5.7		34.8		49.3		2.4		51.7
Evaluated for Inherent Impairment		157.3		106.2		263.5		171.4		96.5		267.9
Allowance Assigned to Loans and Leases		186.4		111.9		298.3		220.7		98.9		319.6
Allowance for Unfunded Exposures
Commitments and Standby Letters of Credit		34.6		1.7		36.3		36.0		1.7		37.7
Total Allowance for Credit Losses	$	221.0	$	113.6	$	334.6	$	256.7	$	100.6	$	357.3

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Loans and Leases

9 Months Ended

Sep. 30, 2011

Loans and Leases

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

(In Millions)	September 30, 2011			December 31, 2010
Commercial
Commercial and Institutional	$	6,458.0		$	5,914.5
Commercial Real Estate		2,958.2			3,242.4
Lease Financing, net		1,014.1			1,063.7
Non-U.S.		1,315.2			1,046.2
Other		473.8			346.6
Total Commercial		12,219.3			11,613.4
Personal
Residential Real Estate		10,772.4			10,854.9
Private Client		5,427.7			5,423.7
Other		272.0			240.0
Total Personal		16,472.1			16,518.6
Total Loans and Leases		28,691.4			28,132.0
Allowance for Credit Losses Assigned to Loans and Leases		(298.3	)		(319.6	)
Net Loans and Leases	$	28,393.1		$	27,812.4

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 $1.9 billion and $1.4 billion at September 30, 2011 and December 31, 2010, respectively. Loans classified as held for sale totaled $10.0 million at September 30, 2011 and $2.2 million at December 31, 2010.

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 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, 2011 and December 31, 2010 are provided below, segregated by borrower ratings into below average risk, average risk, and watch list categories.

	September 30, 2011								December 31, 2010
(In Millions)	Below Average Risk		Average Risk		Watch List		Total		Below Average Risk		Average Risk		Watch List		Total
Commercial
Commercial and Institutional	$	3,273.0	$	2,974.6	$	210.4	$	6,458.0	$	2,821.5	$	2,849.8	$	243.2	$	5,914.5
Commercial Real Estate		1,291.6		1,362.8		303.8		2,958.2		1,232.8		1,594.3		415.3		3,242.4
Lease Financing, net		536.6		464.1		13.4		1,014.1		571.6		473.0		19.1		1,063.7
Non-U.S.		612.5		687.3		15.4		1,315.2		430.0		596.5		19.7		1,046.2
Other		400.4		73.4		—		473.8		209.5		137.1		—		346.6
Total Commercial		6,114.1		5,562.2		543.0		12,219.3		5,265.4		5,650.7		697.3		11,613.4
Personal
Residential Real Estate		2,739.1		7,631.8		401.5		10,772.4		2,896.0		7,586.9		372.0		10,854.9
Private Client		3,059.1		2,335.4		33.2		5,427.7		3,326.5		2,064.1		33.1		5,423.7
Other		120.1		151.9		—		272.0		78.1		161.9		—		240.0
Total Personal		5,918.3		10,119.1		434.7		16,472.1		6,300.6		9,812.9		405.1		16,518.6
Total Loans and Leases	$	12,032.4	$	15,681.3	$	977.7	$	28,691.4	$	11,566.0	$	15,463.6	$	1,102.4	$	28,132.0

Borrowers designated as below average risk represent exposures with borrower ratings from “1—3”. These credits 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.

Borrowers designated as average risk represent exposures with borrower ratings of “4” and “5”. These credits are expected to exhibit moderate to acceptable probabilities of default and are characterized by borrowers with less financial flexibility than those in the below average risk 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.

Borrowers designated as watch list represent exposures with elevated credit risk profiles that are monitored through internal watch lists, and consist of credits with borrower ratings of “6—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.

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 one of the following conditions are met: (i) no principal and interest is due and unpaid and repayment of the remaining contractual principal and interest is expected; (ii) 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 and repayment of the remaining contractual principal and interest is expected; or (iii) 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). 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 after the contractual due date a principal or interest payment is received. 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, 2011 and December 31, 2010.

September 30, 2011
(In Millions)	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past  Due		Current		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	8.0	$	18.4	$	1.6	$	6,394.5	$	6,422.5	$	35.5	$	6,458.0
Commercial Real Estate		6.3		7.4		5.3		2,855.2		2,874.2		84.0		2,958.2
Lease Financing, net		—		—		—		1,014.1		1,014.1		—		1,014.1
Non-U.S.		—		—		—		1,315.2		1,315.2		—		1,315.2
Other		—		—		—		473.8		473.8		—		473.8
Total Commercial	$	14.3	$	25.8	$	6.9	$	12,052.8	$	12,099.8	$	119.5	$	12,219.3
Personal
Residential Real Estate	$	16.2	$	31.8	$	4.7	$	10,537.8	$	10,590.5	$	181.9	$	10,772.4
Private Client		16.5		10.9		.8		5,393.4		5,421.6		6.1		5,427.7
Other		—		—		—		272.0		272.0		—		272.0
Total Personal		32.7		42.7		5.5		16,203.2		16,284.1		188.0		16,472.1
Total Loans and Leases	$	47.0	$	68.5	$	12.4	$	28,256.0	$	28,383.9	$	307.5	$	28,691.4
						Total Other Real Estate Owned						30.4
						Total Nonperforming Assets					$	337.9

December 31, 2010
(In Millions)	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Current		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	16.3	$	8.2	$	.8	$	5,831.2	$	5,856.5	$	58.0	$	5,914.5
Commercial Real Estate		24.2		15.7		9.4		3,076.7		3,126.0		116.4		3,242.4
Lease Financing, net		—		—		—		1,063.7		1,063.7		—		1,063.7
Non-U.S.		—		—		—		1,046.2		1,046.2		—		1,046.2
Other		—		—		—		346.6		346.6		—		346.6
Total Commercial		40.5		23.9		10.2		11,364.4		11,439.0		174.4		11,613.4
Personal
Residential Real Estate		76.1		17.2		.9		10,607.4		10,701.6		153.3		10,854.9
Private Client		35.7		13.0		1.9		5,367.8		5,418.4		5.3		5,423.7
Other		—		—		—		240.0		240.0		—		240.0
Total Personal		111.8		30.2		2.8		16,215.2		16,360.0		158.6		16,518.6
Total Loans and Leases	$	152.3	$	54.1	$	13.0	$	27,579.6	$	27,799.0	$	333.0	$	28,132.0
						Total Other Real Estate Owned						45.5
						Total Nonperforming Assets					$	378.5

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. Impaired loans are 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 reserve 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 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, 2011						Three Months Ended September 30, 2011				Nine Months Ended September 30, 2011
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Reserve		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With No Related Specific Reserve
Commercial and Institutional	$	21.5	$	27.2			$	20.1	$	—	$	21.0	$	—
Commercial Real Estate		41.9		53.7				34.2		.3		34.5		.4
Residential Real Estate		138.8		178.3				107.9		.5		123.2		1.6
Private Client		5.3		5.6				3.2		—		3.5		—
With a Related Specific Reserve
Commercial and Institutional		16.0		25.0	$	11.9		12.7		—		29.1		—
Commercial Real Estate		52.6		68.2		17.2		45.2		—		71.0		—
Residential Real Estate		11.1		11.6		5.2		7.5		—		8.3		—
Private Client		1.7		1.7		.5		1.7		—		2.2		—
Total
Commercial		132.0		174.1		29.1		112.2		.3		155.6		.4
Personal		156.9		197.2		5.7		120.3		.5		137.2		1.6
Total	$	288.9	$	371.3	$	34.8	$	232.5	$	.8	$	292.8	$	2.0

	As of December 31, 2010
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Reserve
With No Related Specific Reserve
Commercial and Institutional	$	17.9	$	26.1
Commercial Real Estate		43.7		62.4
Residential Real Estate		111.9		138.1
Private Client		3.7		3.9
With a Related Specific Reserve
Commercial and Institutional		41.7		47.8	$	19.8
Commercial Real Estate		77.2		88.9		29.5
Residential Real Estate		5.1		5.1		2.4
Total
Commercial		180.5		225.2		49.3
Personal		120.7		147.1		2.4
Total	$	301.2	$	372.3	$	51.7

The following table provides average recorded investments in impaired loans and the interest income that would have been recorded on nonperforming loans in accordance with their original terms, for the three and nine months ended September 30, 2011 and 2010.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2011		2010		2011		2010
Average Recorded Investment in Impaired Loans *	$	232.5	$	257.6	$	292.8	$	233.5
Interest Income That Would Have Been Recorded on Nonperforming Loans in Accordance with Their Original Terms		3.7		4.2		11.8		11.8

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

There were $11.8 million and $16.3 million of unfunded loan commitments and standby letters of credit at September 30, 2011 and December 31, 2010, respectively, issued to borrowers whose loans were classified as nonperforming or impaired.

Troubled Debt Restructurings. As of September 30, 2011 and December 31, 2010, there were $76.2 million and $33.4 million of nonperforming TDRs, respectively, and $35.5 million and $22.9 million of performing TDRs, respectively, included within impaired loans. All TDRs are considered impaired loans in the calendar year of their restructuring. In subsequent years, a TDR may cease being classified 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 classified as impaired.

The following table provides, by class, the number of loans and leases modified in troubled debt restructurings during the three and nine month periods ended September 30, 2011, and the recorded investments and unpaid principal balances as of September 30, 2011.

	Three Months Ended September 30, 2011						Nine Months Ended September 30, 2011
	Number of		Recorded		Unpaid Principal		Number of		Recorded		Unpaid Principal
($ In Millions)	Loans and Leases		Investment		Balance		Loans and Leases		Investment		Balance
Commercial
Commercial and Institutional		2	$	5.4	$	6.4		5	$	8.6	$	10.1
Commercial Real Estate		6		10.6		12.3		14		39.4		46.0
Total Commercial		8		16.0		18.7		19		48.0		56.1
Personal
Residential Real Estate		25		7.1		9.1		113		22.0		27.9
Private Client		—		—		—		1		—		—
Total Personal		25		7.1		9.1		114		22.0		27.9
Total Loans and Leases		33	$	23.1	$	27.8		133	$	70.0	$	84.0

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

TDR modifications primarily 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-month periods ended September 30, 2011, TDR modifications of loans within the commercial and institutional class were primarily interest rate concessions, deferrals of principal and other modifications; modifications of commercial real estate loans were primarily deferrals of principal, extensions of term and other modifications; and modifications of residential real estate loans were primarily interest rate concessions and deferrals of principal.

The following table provides the number of loans and leases modified in troubled debt restructurings during the previous 12 months which subsequently became nonperforming during the three and nine month periods ended September 30, 2011, as well as the recorded investments and unpaid principal balances as of September 30, 2011.

	Three Months Ended September 30, 2011						Nine Months Ended September 30, 2011
	Number of		Recorded		Unpaid Principal		Number of		Recorded		Unpaid Principal
($ In Millions)	Loans and Leases		Investment		Balance		Loans and Leases		Investment		Balance
Commercial
Commercial and Institutional		1	$	.2	$	.6		1	$	.2	$	.6
Total Commercial		1		.2		.6		1		.2		.6
Personal
Residential Real Estate		1		.1		.1		7		2.0		2.5
Total Personal		1		.1		.1		7		2.0		2.5
Total Loans and Leases		2	$	.3	$	.7		8	$	2.2	$	3.1

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

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

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Securities Continuous Unrealized Loss Position (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Investments, Unrealized Loss Position [Line Items]
Less Than 12 Months Fair Value	$ 8,796.5	$ 3,480.5
Less Than 12 Months Unrealized Losses	22.7	34.2
12 Months or Longer Fair Value	879.9	1,120.1
12 Months or Longer Unrealized Losses	51.3	65.3
Total Fair Value	9,676.4	4,600.6
Total Unrealized Losses	74.0	99.5
Obligations of States and Political Subdivisions
Investments, Unrealized Loss Position [Line Items]
Less Than 12 Months Fair Value	1.0	3.0
12 Months or Longer Fair Value	3.1	3.2
12 Months or Longer Unrealized Losses	0.1	0.4
Total Fair Value	4.1	6.2
Total Unrealized Losses	0.1	0.4
Government Sponsored Agency
Investments, Unrealized Loss Position [Line Items]
Less Than 12 Months Fair Value	5,335.3	980.7
Less Than 12 Months Unrealized Losses	11.4	11.0
12 Months or Longer Fair Value	414.1	328.7
12 Months or Longer Unrealized Losses	2.0	2.5
Total Fair Value	5,749.4	1,309.4
Total Unrealized Losses	13.4	13.5
Corporate Debt
Investments, Unrealized Loss Position [Line Items]
Less Than 12 Months Fair Value	408.8	930.6
Less Than 12 Months Unrealized Losses	1.3	1.1
12 Months or Longer Fair Value	99.2	475.2
12 Months or Longer Unrealized Losses	1.1	0.4
Total Fair Value	508.0	1,405.8
Total Unrealized Losses	2.4	1.5
Residential Mortgage-Backed
Investments, Unrealized Loss Position [Line Items]
Less Than 12 Months Fair Value	5.6
Less Than 12 Months Unrealized Losses	0.2
12 Months or Longer Fair Value	177.4	248.8
12 Months or Longer Unrealized Losses	32.2	54.3
Total Fair Value	183.0	248.8
Total Unrealized Losses	32.4	54.3
Other Asset-Backed
Investments, Unrealized Loss Position [Line Items]
Less Than 12 Months Fair Value	687.8	513.5
Less Than 12 Months Unrealized Losses	2.2	2.2
12 Months or Longer Fair Value	87.4	27.0
12 Months or Longer Unrealized Losses	0.3	0.1
Total Fair Value	775.2	540.5
Total Unrealized Losses	2.5	2.3
Auction Rate
Investments, Unrealized Loss Position [Line Items]
Less Than 12 Months Fair Value	63.2	77.6
Less Than 12 Months Unrealized Losses	4.9	3.3
12 Months or Longer Fair Value	53.9	0.7
12 Months or Longer Unrealized Losses	4.9	0.1
Total Fair Value	117.1	78.3
Total Unrealized Losses	9.8	3.4
Other
Investments, Unrealized Loss Position [Line Items]
Less Than 12 Months Fair Value	260.6	482.2
Less Than 12 Months Unrealized Losses	2.0	6.8
12 Months or Longer Fair Value	44.8	36.5
12 Months or Longer Unrealized Losses	10.7	7.5
Total Fair Value	305.4	518.7
Total Unrealized Losses	12.7	14.3
Certificates of Deposit
Investments, Unrealized Loss Position [Line Items]
Less Than 12 Months Fair Value	2,034.2
Less Than 12 Months Unrealized Losses	0.7
Total Fair Value	2,034.2
Total Unrealized Losses	0.7
U.S. Government
Investments, Unrealized Loss Position [Line Items]
Less Than 12 Months Fair Value		492.9
Less Than 12 Months Unrealized Losses		9.8
Total Fair Value		492.9
Total Unrealized Losses		$ 9.8

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CONSOLIDATED STATEMENT OF INCOME (Parenthetical) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Changes in Other-Than-Temporary-Impairment (OTTI) Losses	$ 0.5		$ 7.3		$ (1.1)		$ 6.6
Noncredit-related Losses Recorded in/ (Reclassified from) OCI	(1.8)	[1]	(21.3)	[1]	(22.2)	[1]	(20.7)	[1]
Other Security Gains (Losses), net	(0.7)		0.5		(0.8)		0.8
Investment Security Gains (Losses), net	$ (2.0)	[2]	$ (13.5)	[2]	$ (24.1)	[2]	$ (13.3)	[2]

[1] 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.

[2] Changes in Other-Than-Temporary-Impairment (OTTI) Losses $ .5 $ 7.3 $ (1.1 ) $ 6.6 Noncredit-related OTTI Losses Recorded in/(Reclassified from) OCI (1.8 ) (21.3 ) (22.2 ) (20.7 ) Other Security Gains (Losses), net (.7 ) .5 (.8 ) .8 Investment Security Gains (Losses), net $ (2.0 ) $ (13.5 ) $ (24.1 ) $ (13.3 )

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Derivative Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Derivative Instruments and Hedging Activities Disclosure [Line Items]
This amount represents additional cash collateral received from derivative counterparties not offset against derivative assets and liabilities	$ 2,800,000		$ 2,800,000		$ 9,900,000
This amount represents additional cash collateral deposited with derivative counterparties not offset against derivative assets and liabilities	185,200,000		185,200,000		500,000
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position	500,000,000		500,000,000		3,300,000,000
Collateral deposited with derivative counterparties for derivatives instruments with credit-risk-related contigent features that are in a liability position	400,000,000		400,000,000		2,900,000,000
Termination payments that could have been required for derivative instruments with credit-risk-related contingent features	100,000		100,000		387,100,000
Sterling denominated debt designated as hedges of foreign exchange risk	240,700,000		240,700,000		241,800,000
Maximum length of time being hedged for exposure to variability in future cash flows of forecasted foreign currency denominated transactions			Twenty-three 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.
Net foreign exchange contract losses reclassified from AOCI		6,300,000		6,300,000
Estimated net gain (loss) to be reclassified into earnings within the next twelve months relating to cash flow hedges	(4,800,000)		(4,800,000)
Derivative Financial Instruments, Assets
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative assets recorded on the consolidated balance sheet, reduced as a result of master netting agreements	2,100,000,000		2,100,000,000		1,800,000,000
Reduction in derivative assets (liabilities) due to cash collateral received from (deposited with) derivative counterparties	100,000,000		100,000,000		2,600,000,000
Derivative Financial Instruments, Liabilities
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative liabilities recorded on the consolidated balance sheet, reduced as a result of master netting agreements	2,100,000,000		2,100,000,000		1,800,000,000
Reduction in derivative assets (liabilities) due to cash collateral received from (deposited with) derivative counterparties	(1,600,000,000)		(1,600,000,000)		(3,000,000,000)
Client Related and Trading
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Percentage of derivatives outstanding related to client-related and trading activities	97.00%		97.00%		97.00%
Changes recorded in the fair value of the hedged items in a fair value hedge	100,000	200,000	400,000	200,000
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	$ 100,000	$ 100,000	$ 400,000	$ 100,000

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Basis of Presentation

9 Months Ended

Sep. 30, 2011

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, 2011 and 2010, 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. Certain prior period balances have been reclassified consistent with the current period’s presentations. For a description of Northern Trust’s significant accounting policies, refer to Note 1 of the Notes to Consolidated Financial Statements in the 2010 Annual Report to Shareholders.

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Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2011

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

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, 2011						December 31, 2010
	Notional Value		Fair Value				Notional Value		Fair Value
(In Millions)			Asset		Liability				Asset		Liability
Foreign Exchange Contracts	$	270,614.5	$	5,202.9	$	5,190.0	$	242,007.1	$	5,747.9	$	5,729.9
Interest Rate Option Contracts		100.7		—		—		126.1		.1		.1
Interest Rate Swap Contracts		4,468.9		193.6		189.5		4,301.7		151.2		148.4
Total	$	275,184.1	$	5,396.5	$	5,379.5	$	246,434.9	$	5,899.2	$	5,878.4

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

The following table provides 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, 2011 and 2010.

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)
Three Months Ended September 30,	2011			2010			2011		2010
Net Gain/(Loss) Recognized in AOCI	$	(24.8	)	$	43.2		$	.2	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Trust, Investment and Other Servicing Fees		.7			.4			—		—
Other Operating Income		(.2	)		(.1	)		—		—
Interest Income		(.2	)		(.1	)		.1		—
Interest Expense		—			—			—		—
Compensation		.6			.1			—		—
Employee Benefits		.2			.1			—		—
Equipment and Software		—			—			—		—
Occupancy Expense		.1			.2			—		—
Other Operating Expense		.6			(1.5	)		—		—
Total	$	1.8		$	(.9	)	$	.1	$	—

(In Millions)	Foreign Exchange Contracts (Before Tax)						Interest Rate Swap Contracts (Before Tax)
Nine Months Ended September 30,	2011			2010			2011		2010
Net Gain/(Loss) Recognized in AOCI	$	(9.0	)	$	56.9		$	.2	$	—
Net Gain/(Loss) Reclassified from AOCI to Earnings
Trust, Investment and Other Servicing Fees		1.0			10.2			—		—
Other Operating Income		0			.3			—		—
Interest Income		(1.0	)		2.0			.1		—
Interest Expense		—			.1			—		—
Compensation		3.0			(8.4	)		—		—
Employee Benefits		.9			(2.2	)		—		—
Equipment and Software		.1			(.1	)		—		—
Occupancy Expense		.5			(1.1	)		—		—
Other Operating Expense		1.9			(4.5	)		—		—
Total	$	6.4		$	(3.7	)	$	.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, 2011 and 2010.

	Amount of Hedging Gain/(Loss) Recognized in OCI (Before Tax)
	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	2011		2010			2011			2010
Foreign Exchange Contracts	$	75.6	$	(109.1	)	$	(1.9	)	$	29.6
Sterling Denominated Subordinated Debt		5.7		(6.9	)		(2.2	)		3.5
Sterling Denominated Senior Debt		—		(5.8	)		—			10.5
Total	$	81.3	$	(121.8	)	$	(4.1	)	$	43.6

Fair Value Hedges

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, 2011 and 2010.

			Amount of Derivative Gain/(Loss) Recognized in Income
	Derivative	Location of Derivative Gain/(Loss) Recognized	Three Months Ended September 30,						Nine Month Ended September 30,
(In Millions)	Instrument	in Income	2011			2010			2011			2010
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Income	$	(27.0	)	$	(10.2	)	$	(53.2	)	$	(21.8	)
Senior Notes and Long -Term Subordinated Debt	Interest Rate Swap Contracts	Interest Expense		39.0			33.3			190.4			104.5
Total			$	12.0		$	23.1		$	137.2		$	82.7

Designated as Hedging Instrument

Types and Classifications of Derivative Instruments

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

			September 30, 2011						December 31, 2010
	Derivative	Risk	Notional		Fair Value				Notional		Fair Value
(In Millions)	Instrument	Classification	Value		Asset		Liability		Value		Asset		Liability
Fair Value Hedges
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate	$	1,682.0	$	2.0	$	42.3	$	860.0	$	4.8	$	14.9
Senior Notes and Long-Term Subordinated Debt	Interest Rate Swap Contracts	Interest Rate		1,100.0		152.4		.4		1,100.0		129.8		.4
Cash Flow Hedges
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		923.9		11.1		18.5		935.3		19.3		15.2
Available for Sale Investment Securities	Interest Rate Swap Contracts	Interest Rate		500.0		—		.1		—		—		—
Net Investment Hedges
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		1,452.3		3.7		3.1		1,390.1		13.0		18.3
Total			$	5,658.2	$	169.2	$	64.4	$	4,285.4	$	166.9	$	48.8

Nondesignated

Gains/Losses of Derivative Financial Instruments

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, 2011 and 2010.

	Location of Derivative Gain/	Amount of Derivative Gain/(Loss) Recognized in Income
	(Loss) Recognized	Three Months Ended September 30,					Nine Months Ended September 30,
(In Millions)	in Income	2011		2010			2011			2010
Credit Default Swap Contracts	Other Operating Income	$	1.1	$	(1.6	)	$	.3		$	(1.2	)
Forward Contracts	Other Operating Income		—		—			.2			—
Foreign Exchange Contracts	Other Operating Income		6.1		(14.7	)		(5.8	)		(8.1	)
Total		$	7.2	$	(16.3	)	$	(5.3	)	$	(9.3	)

Types and Classifications of Derivative Instruments

The following table identifies the types and classifications of risk management derivative instruments not formally designated as hedges, their notional and fair values, and the respective risks addressed.

			September 30, 2011						December 31, 2010
	Derivative	Risk	Notional		Fair Value				Notional		Fair Value
(In Millions)	Instrument	Classification	Value		Asset		Liability		Value		Asset		Liability
Commercial Loans and Loan Commitments	Credit Default Swap Contracts	Credit	$	85.5	$	—	$	0.4	$	149.5	$	—	$	2.8
Loan Commitments	Forward Contracts	Interest Rate		1.1		—		—		14.3		.5		.2
Forecasted Foreign Currency Denominated Transactions	Foreign Exchange Contracts	Foreign Currency		194.1		4.2		5.1		616.1		12.3		16.2
Commercial Loans	Foreign Exchange Contracts	Foreign Currency		141.9		4.2		.1		60.6		.1		.9
Net Investments in Non-U.S. Affiliates	Foreign Exchange Contracts	Foreign Currency		57.2		.5		—		61.3		.2		.8
Total			$	479.8	$	8.9	$	5.6	$	901.8	$	13.1	$	20.9

Client Related and Trading

Gains/Losses of Derivative Financial Instruments

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, 2011 and 2010.

	Location of	Amount of Derivative Gain/(Loss) Recognized in Income
	Derivative Gain/ (Loss) Recognized	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	in Income	2011		2010		2011		2010
Foreign Exchange Contracts	Foreign Exchange Trading Income	$	87.2	$	89.0	$	252.8	$	284.0
Interest Rate Swap and Option Contracts	Security Commissions and Trading Income		1.0		3.0		3.9		5.7
Total		$	88.2	$	92.0	$	256.7	$	289.7

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Loans and Leases (Tables)

9 Months Ended

Sep. 30, 2011

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, 2011			December 31, 2010
Commercial
Commercial and Institutional	$	6,458.0		$	5,914.5
Commercial Real Estate		2,958.2			3,242.4
Lease Financing, net		1,014.1			1,063.7
Non-U.S.		1,315.2			1,046.2
Other		473.8			346.6
Total Commercial		12,219.3			11,613.4
Personal
Residential Real Estate		10,772.4			10,854.9
Private Client		5,427.7			5,423.7
Other		272.0			240.0
Total Personal		16,472.1			16,518.6
Total Loans and Leases		28,691.4			28,132.0
Allowance for Credit Losses Assigned to Loans and Leases		(298.3	)		(319.6	)
Net Loans and Leases	$	28,393.1		$	27,812.4

Loan and Lease Segment and Class Balances Segregated by Borrower Ratings into Below Average Risk, Average Risk, and Watch List Categories

Loan and lease segment and class balances as of September 30, 2011 and December 31, 2010 are provided below, segregated by borrower ratings into below average risk, average risk, and watch list categories.

	September 30, 2011								December 31, 2010
(In Millions)	Below Average Risk		Average Risk		Watch List		Total		Below Average Risk		Average Risk		Watch List		Total
Commercial
Commercial and Institutional	$	3,273.0	$	2,974.6	$	210.4	$	6,458.0	$	2,821.5	$	2,849.8	$	243.2	$	5,914.5
Commercial Real Estate		1,291.6		1,362.8		303.8		2,958.2		1,232.8		1,594.3		415.3		3,242.4
Lease Financing, net		536.6		464.1		13.4		1,014.1		571.6		473.0		19.1		1,063.7
Non-U.S.		612.5		687.3		15.4		1,315.2		430.0		596.5		19.7		1,046.2
Other		400.4		73.4		—		473.8		209.5		137.1		—		346.6
Total Commercial		6,114.1		5,562.2		543.0		12,219.3		5,265.4		5,650.7		697.3		11,613.4
Personal
Residential Real Estate		2,739.1		7,631.8		401.5		10,772.4		2,896.0		7,586.9		372.0		10,854.9
Private Client		3,059.1		2,335.4		33.2		5,427.7		3,326.5		2,064.1		33.1		5,423.7
Other		120.1		151.9		—		272.0		78.1		161.9		—		240.0
Total Personal		5,918.3		10,119.1		434.7		16,472.1		6,300.6		9,812.9		405.1		16,518.6
Total Loans and Leases	$	12,032.4	$	15,681.3	$	977.7	$	28,691.4	$	11,566.0	$	15,463.6	$	1,102.4	$	28,132.0

Past Due Status of The Recorded Investment in Financing Receivables by Class and by Segment

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, 2011 and December 31, 2010.

September 30, 2011
(In Millions)	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past  Due		Current		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	8.0	$	18.4	$	1.6	$	6,394.5	$	6,422.5	$	35.5	$	6,458.0
Commercial Real Estate		6.3		7.4		5.3		2,855.2		2,874.2		84.0		2,958.2
Lease Financing, net		—		—		—		1,014.1		1,014.1		—		1,014.1
Non-U.S.		—		—		—		1,315.2		1,315.2		—		1,315.2
Other		—		—		—		473.8		473.8		—		473.8
Total Commercial	$	14.3	$	25.8	$	6.9	$	12,052.8	$	12,099.8	$	119.5	$	12,219.3
Personal
Residential Real Estate	$	16.2	$	31.8	$	4.7	$	10,537.8	$	10,590.5	$	181.9	$	10,772.4
Private Client		16.5		10.9		.8		5,393.4		5,421.6		6.1		5,427.7
Other		—		—		—		272.0		272.0		—		272.0
Total Personal		32.7		42.7		5.5		16,203.2		16,284.1		188.0		16,472.1
Total Loans and Leases	$	47.0	$	68.5	$	12.4	$	28,256.0	$	28,383.9	$	307.5	$	28,691.4
						Total Other Real Estate Owned						30.4
						Total Nonperforming Assets					$	337.9

December 31, 2010
(In Millions)	30-59 Days Past Due		60-89 Days Past Due		90 Days or More Past Due		Current		Total Performing		Nonperforming		Total Loans and Leases
Commercial
Commercial and Institutional	$	16.3	$	8.2	$	.8	$	5,831.2	$	5,856.5	$	58.0	$	5,914.5
Commercial Real Estate		24.2		15.7		9.4		3,076.7		3,126.0		116.4		3,242.4
Lease Financing, net		—		—		—		1,063.7		1,063.7		—		1,063.7
Non-U.S.		—		—		—		1,046.2		1,046.2		—		1,046.2
Other		—		—		—		346.6		346.6		—		346.6
Total Commercial		40.5		23.9		10.2		11,364.4		11,439.0		174.4		11,613.4
Personal
Residential Real Estate		76.1		17.2		.9		10,607.4		10,701.6		153.3		10,854.9
Private Client		35.7		13.0		1.9		5,367.8		5,418.4		5.3		5,423.7
Other		—		—		—		240.0		240.0		—		240.0
Total Personal		111.8		30.2		2.8		16,215.2		16,360.0		158.6		16,518.6
Total Loans and Leases	$	152.3	$	54.1	$	13.0	$	27,579.6	$	27,799.0	$	333.0	$	28,132.0
						Total Other Real Estate Owned						45.5
						Total Nonperforming Assets					$	378.5

Impaired Loans by Segment and Class

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

	As of September 30, 2011						Three Months Ended September 30, 2011				Nine Months Ended September 30, 2011
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Reserve		Average Recorded Investment		Interest Income Recognized		Average Recorded Investment		Interest Income Recognized
With No Related Specific Reserve
Commercial and Institutional	$	21.5	$	27.2			$	20.1	$	—	$	21.0	$	—
Commercial Real Estate		41.9		53.7				34.2		.3		34.5		.4
Residential Real Estate		138.8		178.3				107.9		.5		123.2		1.6
Private Client		5.3		5.6				3.2		—		3.5		—
With a Related Specific Reserve
Commercial and Institutional		16.0		25.0	$	11.9		12.7		—		29.1		—
Commercial Real Estate		52.6		68.2		17.2		45.2		—		71.0		—
Residential Real Estate		11.1		11.6		5.2		7.5		—		8.3		—
Private Client		1.7		1.7		.5		1.7		—		2.2		—
Total
Commercial		132.0		174.1		29.1		112.2		.3		155.6		.4
Personal		156.9		197.2		5.7		120.3		.5		137.2		1.6
Total	$	288.9	$	371.3	$	34.8	$	232.5	$	.8	$	292.8	$	2.0

	As of December 31, 2010
(In Millions)	Recorded Investment		Unpaid Principal Balance		Specific Reserve
With No Related Specific Reserve
Commercial and Institutional	$	17.9	$	26.1
Commercial Real Estate		43.7		62.4
Residential Real Estate		111.9		138.1
Private Client		3.7		3.9
With a Related Specific Reserve
Commercial and Institutional		41.7		47.8	$	19.8
Commercial Real Estate		77.2		88.9		29.5
Residential Real Estate		5.1		5.1		2.4
Total
Commercial		180.5		225.2		49.3
Personal		120.7		147.1		2.4
Total	$	301.2	$	372.3	$	51.7

Average Recorded Investment in Impaired Loans and Interest Income that would have been Recorded on Nonperforming Loans

The following table provides average recorded investments in impaired loans and the interest income that would have been recorded on nonperforming loans in accordance with their original terms, for the three and nine months ended September 30, 2011 and 2010.

	Three Months Ended September 30,				Nine Months Ended September 30,
(In Millions)	2011		2010		2011		2010
Average Recorded Investment in Impaired Loans *	$	232.5	$	257.6	$	292.8	$	233.5
Interest Income That Would Have Been Recorded on Nonperforming Loans in Accordance with Their Original Terms		3.7		4.2		11.8		11.8

* 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 which were Modified in Troubled Debt Restructurings, as well as the Recorded Investment and Unpaid Principal Balance

The following table provides, by class, the number of loans and leases modified in troubled debt restructurings during the three and nine month periods ended September 30, 2011, and the recorded investments and unpaid principal balances as of September 30, 2011.

	Three Months Ended September 30, 2011						Nine Months Ended September 30, 2011
	Number of		Recorded		Unpaid Principal		Number of		Recorded		Unpaid Principal
($ In Millions)	Loans and Leases		Investment		Balance		Loans and Leases		Investment		Balance
Commercial
Commercial and Institutional		2	$	5.4	$	6.4		5	$	8.6	$	10.1
Commercial Real Estate		6		10.6		12.3		14		39.4		46.0
Total Commercial		8		16.0		18.7		19		48.0		56.1
Personal
Residential Real Estate		25		7.1		9.1		113		22.0		27.9
Private Client		—		—		—		1		—		—
Total Personal		25		7.1		9.1		114		22.0		27.9
Total Loans and Leases		33	$	23.1	$	27.8		133	$	70.0	$	84.0

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

Number of Loans and Leases Modified in Troubled Debt Restructurings during the previous 12 Months which became Nonperforming, as well as the Recorded Investment and Unpaid Principal Balance

The following table provides the number of loans and leases modified in troubled debt restructurings during the previous 12 months which subsequently became nonperforming during the three and nine month periods ended September 30, 2011, as well as the recorded investments and unpaid principal balances as of September 30, 2011.

	Three Months Ended September 30, 2011						Nine Months Ended September 30, 2011
	Number of		Recorded		Unpaid Principal		Number of		Recorded		Unpaid Principal
($ In Millions)	Loans and Leases		Investment		Balance		Loans and Leases		Investment		Balance
Commercial
Commercial and Institutional		1	$	.2	$	.6		1	$	.2	$	.6
Total Commercial		1		.2		.6		1		.2		.6
Personal
Residential Real Estate		1		.1		.1		7		2.0		2.5
Total Personal		1		.1		.1		7		2.0		2.5
Total Loans and Leases		2	$	.3	$	.7		8	$	2.2	$	3.1

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

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Loans and Leases - Additional Information (Detail) (USD $)	3 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other U.S. loans and non-U.S. loans, short duration advances	$ 1,900,000,000	$ 1,400,000,000
Unfunded loan commitments and standby letters of credit	11,800,000	16,300,000
Days contractually past due for interest and principal and the loan is not well-secured and in the process of collection	More than 90 days
Period for which troubled debt restructurings with modified terms is performing before ceasing to be classified as impaired loan	At least six months
Total Loans and Leases	28,691,400,000	28,132,000,000
Residential Portfolio Segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential real estate	10,000,000	2,200,000
Upper Limit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum limit of individual homogeneous loans collective evaluation for impairment and excluded from impaired loan disclosures	250,000
Nonperforming Financing Receivable | Troubled Debt Restructuring
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	76,200,000	33,400,000
Performing Financing Receivable | Troubled Debt Restructuring
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 35,500,000	$ 22,900,000

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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 (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	$ 28,691.4	$ 28,132.0
Total Other Real Estate Owned	30.4	45.5
Total Nonperforming Assets	337.9	378.5
Commercial | Performing Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	14.3	40.5
60 - 89 Days Past Due	25.8	23.9
90 Days or More Past Due	6.9	10.2
Current	12,052.8	11,364.4
Total Loans and Leases	12,099.8	11,439.0
Commercial | Performing Financing Receivable | Commercial and Institutional
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	8.0	16.3
60 - 89 Days Past Due	18.4	8.2
90 Days or More Past Due	1.6	0.8
Current	6,394.5	5,831.2
Total Loans and Leases	6,422.5	5,856.5
Commercial | Performing Financing Receivable | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	6.3	24.2
60 - 89 Days Past Due	7.4	15.7
90 Days or More Past Due	5.3	9.4
Current	2,855.2	3,076.7
Total Loans and Leases	2,874.2	3,126.0
Commercial | Performing Financing Receivable | Lease Financing, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,014.1	1,063.7
Total Loans and Leases	1,014.1	1,063.7
Commercial | Performing Financing Receivable | Non-U.S.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,315.2	1,046.2
Total Loans and Leases	1,315.2	1,046.2
Commercial | Performing Financing Receivable | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	473.8	346.6
Total Loans and Leases	473.8	346.6
Personal | Performing Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	32.7	111.8
60 - 89 Days Past Due	42.7	30.2
90 Days or More Past Due	5.5	2.8
Current	16,203.2	16,215.2
Total Loans and Leases	16,284.1	16,360.0
Personal | Performing Financing Receivable | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	16.2	76.1
60 - 89 Days Past Due	31.8	17.2
90 Days or More Past Due	4.7	0.9
Current	10,537.8	10,607.4
Total Loans and Leases	10,590.5	10,701.6
Personal | Performing Financing Receivable | Private Client
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	16.5	35.7
60 - 89 Days Past Due	10.9	13.0
90 Days or More Past Due	0.8	1.9
Current	5,393.4	5,367.8
Total Loans and Leases	5,421.6	5,418.4
Personal | Performing Financing Receivable | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	272.0	240.0
Total Loans and Leases	272.0	240.0
Performing Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 - 59 Days Past Due	47.0	152.3
60 - 89 Days Past Due	68.5	54.1
90 Days or More Past Due	12.4	13.0
Current	28,256.0	27,579.6
Total Loans and Leases	28,383.9	27,799.0
Commercial | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	119.5	174.4
Commercial | Nonperforming Financing Receivable | Commercial and Institutional
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	35.5	58.0
Commercial | Nonperforming Financing Receivable | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	84.0	116.4
Personal | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	188.0	158.6
Personal | Nonperforming Financing Receivable | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	181.9	153.3
Personal | Nonperforming Financing Receivable | Private Client
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	6.1	5.3
Nonperforming Financing Receivable
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	307.5	333.0
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	12,219.3	11,613.4
Commercial | Commercial and Institutional
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	6,458.0	5,914.5
Commercial | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	2,958.2	3,242.4
Commercial | Lease Financing, net
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	1,014.1	1,063.7
Commercial | Non-U.S.
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	1,315.2	1,046.2
Commercial | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	473.8	346.6
Personal
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	16,472.1	16,518.6
Personal | Residential Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	10,772.4	10,854.9
Personal | Private Client
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	5,427.7	5,423.7
Personal | Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans and Leases	$ 272.0	$ 240.0

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Securities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011 Contract Investment	Sep. 30, 2010	Sep. 30, 2011 Contract Investment	Sep. 30, 2010	Dec. 31, 2010
Gain (Loss) on Investments [Line Items]
Realized securities losses	$ 2.0	$ 13.5	$ 24.1	$ 13.3
Realized securities (gains) losses	0.7	0.5	0.8	0.8
Net Impairment Losses Recognized in Earnings	1.3	14.0	23.3	14.1
Number of securties in an unrealized loss position	341		341
Total Fair Value	9,676.4		9,676.4		4,600.6
Total Unrealized Losses	74.0		74.0		99.5
12 Months or Longer Unrealized Losses	51.3		51.3		65.3
Residential Mortgage-Backed
Gain (Loss) on Investments [Line Items]
Net Impairment Losses Recognized in Earnings	1.3	14.0	23.3	14.1
Number of securties in an unrealized loss position for more than 12 months	25		25
Total Unrealized Losses	32.4		32.4
12 Months or Longer Unrealized Losses	32.2		32.2
Residential Mortgage-Backed | AA Credit Rating | Sub-prime and Alt-A Mortgage Backed Securities
Gain (Loss) on Investments [Line Items]
Percentage of residential mortgage backed securities rated below double-A	81.00%		81.00%
Residential Mortgage-Backed | Sub-prime and Alt-A Mortgage Backed Securities
Gain (Loss) on Investments [Line Items]
Net Impairment Losses Recognized in Earnings	1.3	14.0	23.3	14.1
Credit Rating			Below double-A
Residential mortgage-backed securities total amortized cost	179.7		179.7
Residential mortgage-backed securities fair value	149.2		149.2
Other Asset-Backed | Floating Rate Securities
Gain (Loss) on Investments [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
Gain (Loss) on Investments [Line Items]
Average life	5		5
Non-Agency RMBS | Financing Receivable, Current | Upper Limit
Gain (Loss) on Investments [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, Current | Lower Limit
Gain (Loss) on Investments [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, 30 to 59 Days Past Due
Gain (Loss) on Investments [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
Gain (Loss) on Investments [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
Gain (Loss) on Investments [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
Gain (Loss) on Investments [Line Items]
Expected loss on subprime, Alt-A, prime and 2nd lien portfolios developed using default roll rate	100.00%		100.00%
Government Sponsored Agency
Gain (Loss) on Investments [Line Items]
Total Unrealized Losses	13.4		13.4
Other | Community Reinvestment Act CRA
Gain (Loss) on Investments [Line Items]
Total Unrealized Losses	12.7		12.7
Auction Rate
Gain (Loss) on Investments [Line Items]
Total Unrealized Losses	9.8		9.8
Corporate Debt
Gain (Loss) on Investments [Line Items]
Total Unrealized Losses	$ 2.4		$ 2.4
Percent of corporate debt unrealized losses	74.00%		74.00%

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Number of Loans and Leases Modified in Troubled Debt Restructurings during the previous 12 Months which became Disclosure - Nonperforming, as well as the Recorded Investment and Unpaid Principal Balance (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011 Contract	Sep. 30, 2011 Contract
Number of Loans and Lease	33	133
Recorded Investment	$ 23.1	$ 70.0
Unpaid Principal Balance	27.8	84.0
Commercial | Nonperforming Financing Receivable
Number of Loans and Lease	1	1
Recorded Investment	0.2	0.2
Unpaid Principal Balance	0.6	0.6
Commercial | Nonperforming Financing Receivable | Commercial and Institutional
Number of Loans and Lease	1	1
Recorded Investment	0.2	0.2
Unpaid Principal Balance	0.6	0.6
Personal | Nonperforming Financing Receivable
Number of Loans and Lease	1	7
Recorded Investment	0.1	2.0
Unpaid Principal Balance	0.1	2.5
Personal | Nonperforming Financing Receivable | Residential Real Estate
Number of Loans and Lease	1	7
Recorded Investment	0.1	2.0
Unpaid Principal Balance	0.1	2.5
Nonperforming Financing Receivable
Number of Loans and Lease	2	8
Recorded Investment	0.3	2.2
Unpaid Principal Balance	0.7	3.1
Commercial
Number of Loans and Lease	8	19
Recorded Investment	16.0	48.0
Unpaid Principal Balance	18.7	56.1
Commercial | Commercial and Institutional
Number of Loans and Lease	2	5
Recorded Investment	5.4	8.6
Unpaid Principal Balance	6.4	10.1
Personal
Number of Loans and Lease	25	114
Recorded Investment	7.1	22.0
Unpaid Principal Balance	9.1	27.9
Personal | Residential Real Estate
Number of Loans and Lease	25	113
Recorded Investment	7.1	22.0
Unpaid Principal Balance	$ 9.1	$ 27.9

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Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2011

Recent Accounting Pronouncements

2. Recent Accounting Pronouncements – In September 2011, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2011-08, “Testing Goodwill for Impairment”. The ASU provides the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the results of the qualitative analysis indicate it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, the quantitative two-step impairment test, which is required under current U.S. GAAP, would not be necessary. The ASU is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011. The adoption of this ASU by Northern Trust, effective January 1, 2012, is not expected to have an impact on Northern Trust’s consolidated financial position or results of operations.

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Components of Net Interest Income (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Interest Income
Loans and Leases	$ 229.8	$ 231.9	$ 719.5	$ 687.0
Securities - Taxable	54.8	47.7	160.4	142.5
- Non-Taxable	6.1	7.3	19.1	22.1
Interest-Bearing Deposits with Banks	49.2	40.2	131.6	100.8
Federal Reserve Deposits and Other	7.2	3.1	23.2	10.0
Total Interest Income	347.1	330.2	1,053.8	962.4
Interest Expense
Deposits	50.1	53.7	187.0	135.1
Federal Funds Purchased	0.1	1.0	1.8	3.9
Securities Sold Under Agreements to Repurchase	0.1	0.2	0.6	0.7
Other Borrowings	1.4	1.4	4.3	4.0
Senior Notes	16.4	11.5	47.6	34.4
Long-Term Debt	21.6	28.1	73.4	85.8
Floating Rate Capital Debt	0.6	0.8	1.8	1.8
Total Interest Expense	90.3	96.7	316.5	265.7
Net Interest Income	$ 256.8	$ 233.5	$ 737.3	$ 696.7

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Assets and Liabilities Measured at Fair Value on a Recurring Basis Segregated by Fair Value Hierarchy Level (Parenthetical) (Detail) (Fair Value, Measurements, Recurring, Netting and Collateral, USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Derivative Financial Instruments, Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reduction in derivatives due to cash collateral received from and deposited with derivative counterparties	$ 62.9	$ 2,631.7
Derivative Financial Instruments, Liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Reduction in derivatives due to cash collateral received from and deposited with derivative counterparties	$ (1,564.1)	$ (2,952.7)

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Debt Issuance

9 Months Ended

Sep. 30, 2011

Debt Issuance

20. Debt Issuance – On August 22, 2011, Northern Trust sold $500 million of 3.375% fixed-rate senior notes due August 23, 2021. The senior notes are non-callable and unsecured and were sold at a .437% discount. Northern Trust intends to use the proceeds of the offering for general corporate purposes.

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Reserve for Credit Losses and Recorded Investments in Loans and Leases by Segment (Detail) (USD $) In Millions	Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Dec. 31, 2009
Financing Receivable, Allowance for Credit Losses [Line Items]
Specifically Evaluated for Impairment	$ 288.9		$ 301.2
Evaluated for Inherent Impairment	28,402.5		27,830.8
Total Loans and Leases	28,691.4		28,132.0
Specifically Evaluated for Impairment	34.8		51.7
Evaluated for Inherent Impairment	263.5		267.9
Allowance Assigned to Loans and Leases	298.3		319.6
Total Allowance for Credit Losses	334.6	345.8	357.3	361.4	361.6	340.6
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Specifically Evaluated for Impairment	132.0		180.5
Evaluated for Inherent Impairment	12,087.3		11,432.9
Total Loans and Leases	12,219.3		11,613.4
Specifically Evaluated for Impairment	29.1		49.3
Evaluated for Inherent Impairment	157.3		171.4
Allowance Assigned to Loans and Leases	186.4		220.7
Total Allowance for Credit Losses	221.0	239.9	256.7	261.3	265.3	252.2
Commercial | Reserve for Off-balance Sheet Activities
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Unfunded Exposures Commitments and Standby Letters of Credit	34.6		36.0
Personal
Financing Receivable, Allowance for Credit Losses [Line Items]
Specifically Evaluated for Impairment	156.9		120.7
Evaluated for Inherent Impairment	16,315.2		16,397.9
Total Loans and Leases	16,472.1		16,518.6
Specifically Evaluated for Impairment	5.7		2.4
Evaluated for Inherent Impairment	106.2		96.5
Allowance Assigned to Loans and Leases	111.9		98.9
Total Allowance for Credit Losses	113.6	105.9	100.6	100.1	96.3	88.4
Personal | Reserve for Off-balance Sheet Activities
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Unfunded Exposures Commitments and Standby Letters of Credit	1.7		1.7
Reserve for Off-balance Sheet Activities
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Unfunded Exposures Commitments and Standby Letters of Credit	$ 36.3		$ 37.7

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Gains and Losses Recorded in the Consolidated Statement of Income related to Fair Value Hedges (Detail) (Fair Value Hedges, Asset And Liability Management, USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ 12.0	$ 23.1	$ 137.2	$ 82.7
Interest Rate Swap Contracts | Available for Sale Investment Securities | Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	(27.0)	(10.2)	(53.2)	(21.8)
Interest Rate Swap Contracts | Senior Notes and Long- Term Subordinated Debt | Interest Expense (Member)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Derivative Gain/(Loss) Recognized in Income	$ 39.0	$ 33.3	$ 190.4	$ 104.5

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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011 Leveraged Lease Obligations	Dec. 31, 2010 Leveraged Lease Obligations
Income Taxes [Line Items]
Income tax expense	$ 82.4	$ 81.8	$ 238.9	$ 263.0
Effective tax rate	32.60%	34.50%
Unrecognized tax benefits					$ 66.7	$ 66.7

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Average Recorded Investment in Impaired Loans and Interest Income that would have been Recorded on Nonperforming Loans (Detail) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Financing Receivable, Impaired [Line Items]
Average Recorded Investment in Impaired Loans	$ 232.5	[1]	$ 257.6	[1]	$ 292.8	[1]	$ 233.5	[1]
Interest Income that would have been Recorded on Nonperforming Loans in Accordance with their Original Terms	$ 3.7		$ 4.2		$ 11.8		$ 11.8

[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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Goodwill and Other Intangibles (Tables)

9 Months Ended

Sep. 30, 2011

Changes in the Carrying Amount of Goodwill

Changes in the carrying amount of goodwill by business unit for the three months ended March 31, 2011, June 30, 2011, and September 30, 2011 were as follows:

(In Millions)	Corporate and Institutional  Services			Personal Financial Services			Total
Balance at December 31, 2010	$	329.5		$	71.4		$	400.9
Other Changes		4.8			.1			4.9
Balance at March 31, 2011		334.3			71.5			405.8
Goodwill Acquired		30.0			—			30.0
Other Changes		(.9	)		—			(.9	)
Balance at June 30, 2011	$	363.4		$	71.5		$	434.9
Goodwill Acquired		102.1			—			102.1
Other Changes		(2.8	)		(.1	)		(2.9	)
Balance at September 30, 2011	$	462.7		$	71.4		$	534.1

Note: Amounts include the effect of foreign exchange rates on non-U.S. dollar denominated goodwill.

Other Intangible Assets Subject to Amortization

The gross carrying amount and accumulated amortization of other intangible assets subject to amortization at September 30, 2011 and December 31, 2010 were as follows:

	September 30,		December 31,
(In Millions)	2011		2010
Gross Carrying Amount	$	252.5	$	164.2
Less: Accumulated Amortization		122.5		111.0
Net Book Value	$	130.0	$	53.2

Note: Amounts include the effect of foreign exchange rates on non-U.S. dollar denominated intangible assets.

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Assets and Liabilities Measured at Fair Value on a Recurring Basis Segregated by Fair Value Hierarchy Level (Detail) (USD $) In Millions	Sep. 30, 2011		Dec. 31, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	$ 28,439.3		$ 19,901.9
Trading Account	6.3		6.8
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	28,445.6		19,908.7
All Other	114.6		103.3
Total	3,571.1		1,732.6
Total Assets at Fair Value	32,016.7		21,641.3
All Other	102.2		58.6
Total Liabilities at Fair Value	1,932.4		1,235.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	2,020.9		658.4
All Other	75.7		65.9
Total	75.7		65.9
Total Assets at Fair Value	2,096.6		724.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Securities Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	2,020.9		658.4
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Securities Investment | U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	2,020.9		658.4
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	26,235.1		18,882.5
All Other	38.9		37.4
Total	5,613.5		6,116.6
Total Assets at Fair Value	31,848.6		24,999.1
Total Liabilities at Fair Value	5,449.5		5,948.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	26,228.8		18,875.7
Trading Account	6.3		6.8
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 and Nonrecurring Basis [Line Items]
Available for Sale	18.4		36.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Government Sponsored Agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	16,120.7		11,970.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	2,848.6		2,554.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Non-U.S. Government Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	204.3		440.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Residential Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	183.4		254.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	1,637.5		1,605.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Certificates of Deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	3,544.5		1,402.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	1,671.4		611.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	5,574.6		6,079.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets Member | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	5,226.6		5,792.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets Member | Interest Rate Swap Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	348.0		285.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets Member | Interest Rate Option Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives			0.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets Member | Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives			0.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	5,449.5		5,948.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities Member | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	5,216.8		5,781.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities Member | Interest Rate Swap Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	232.3		163.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities Member | Credit Default Swap Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	0.4		2.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities Member | Interest Rate Option Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives			0.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities Member | Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives			0.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	189.6		367.8
Total Assets at Fair Value	189.6		367.8
All Other	102.2		58.6
Total Liabilities at Fair Value	102.2		58.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Securities Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	189.6		367.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Securities Investment | Auction Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	189.6		367.8
Fair Value, Measurements, Recurring | Netting and Collateral
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	(2,118.1)	[1]	(4,449.9)	[2]
Total Assets at Fair Value	(2,118.1)	[1]	(4,449.9)	[2]
Total Liabilities at Fair Value	(3,619.3)	[1]	(4,770.9)	[2]
Fair Value, Measurements, Recurring | Netting and Collateral | Other Assets Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	(2,118.1)	[1]	(4,449.9)	[2]
Fair Value, Measurements, Recurring | Netting and Collateral | Other Liabilities Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	(3,619.3)	[1]	(4,770.9)	[2]
Fair Value, Measurements, Recurring | Securities Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	28,439.3		19,901.9
Trading Account	6.3		6.8
Fair Value, Measurements, Recurring | Securities Investment | U.S. Government
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	2,020.9		658.4
Fair Value, Measurements, Recurring | Securities Investment | Obligations of States and Political Subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	18.4		36.3
Fair Value, Measurements, Recurring | Securities Investment | Government Sponsored Agency
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	16,120.7		11,970.7
Fair Value, Measurements, Recurring | Securities Investment | Corporate Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	2,848.6		2,554.0
Fair Value, Measurements, Recurring | Securities Investment | Non-U.S. Government Debt
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	204.3		440.6
Fair Value, Measurements, Recurring | Securities Investment | Residential Mortgage-Backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	183.4		254.6
Fair Value, Measurements, Recurring | Securities Investment | Other Asset-Backed
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	1,637.5		1,605.7
Fair Value, Measurements, Recurring | Securities Investment | Certificates of Deposit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	3,544.5		1,402.5
Fair Value, Measurements, Recurring | Securities Investment | Auction Rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	189.6		367.8
Fair Value, Measurements, Recurring | Securities Investment | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for Sale	1,671.4		611.3
Fair Value, Measurements, Recurring | Other Assets Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	3,456.5		1,629.3
Fair Value, Measurements, Recurring | Other Assets Member | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	5,226.6		5,792.8
Fair Value, Measurements, Recurring | Other Assets Member | Interest Rate Swap Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	348.0		285.8
Fair Value, Measurements, Recurring | Other Assets Member | Interest Rate Option Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives			0.1
Fair Value, Measurements, Recurring | Other Assets Member | Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives			0.5
Fair Value, Measurements, Recurring | Other Liabilities Member
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	1,830.2		1,177.2
Fair Value, Measurements, Recurring | Other Liabilities Member | Foreign Exchange Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	5,216.8		5,781.3
Fair Value, Measurements, Recurring | Other Liabilities Member | Interest Rate Swap Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	232.3		163.7
Fair Value, Measurements, Recurring | Other Liabilities Member | Credit Default Swap Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	0.4		2.8
Fair Value, Measurements, Recurring | Other Liabilities Member | Interest Rate Option Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives			0.1
Fair Value, Measurements, Recurring | Other Liabilities Member | Forward Contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives			$ 0.2

[1] Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting agreements exist between Northern Trust and the counterparty. As of September 30, 2011, derivative assets and liabilities shown above also include reductions of $62.9 million and $1,564.1 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 agreements exist between Northern Trust and the counterparty. As of December 31, 2010, derivative assets and liabilities shown above also include reductions of $2,631.7 million and $2,952.7 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, 2011

Amortized Cost and Fair Values of Securities

The following tables provide the amortized cost and fair values of securities at September 30, 2011 and December 31, 2010.

		000000		000000		000000		000000
	September 30, 2011
Securities Available for Sale	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
U.S. Government	$	1,967.4	$	53.5	$	—	$	2,020.9
Obligations of States and Political Subdivisions		17.5		.9		—		18.4
Government Sponsored Agency		16,055.4		78.7		13.4		16,120.7
Corporate Debt		2,840.8		10.2		2.4		2,848.6
Non-U.S. Government Debt		204.3		—		—		204.3
Residential Mortgage-Backed		215.8		—		32.4		183.4
Other Asset-Backed		1,638.3		1.7		2.5		1,637.5
Certificates of Deposit		3,545.2		—		.7		3,544.5
Auction Rate		194.6		4.8		9.8		189.6
Other		1,653.5		18.5		.6		1,671.4
Total	$	28,332.8	$	168.3	$	61.8	$	28,439.3

		0000000		0000000		0000000		0000000
	September 30, 2011
Securities Held to Maturity	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
Obligations of States and Political Subdivisions	$	553.1	$	25.3	$	.1	$	578.3
Government Sponsored Agency		163.9		4.9		—		168.8
Other		112.2		—		12.1		100.1
Total	$	829.2	$	30.2	$	12.2	$	847.2

		00000000		00000000		00000000		00000000
	December 31, 2010
Securities Available for Sale	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
U.S. Government	$	667.2	$	1.0	$	9.8	$	658.4
Obligations of States and Political Subdivisions		35.4		.9		—		36.3
Government Sponsored Agency		11,937.0		47.0		13.3		11,970.7
Corporate Debt		2,547.7		7.8		1.5		2,554.0
Non-U.S. Government Debt		440.6		—		—		440.6
Residential Mortgage-Backed		308.0		.9		54.3		254.6
Other Asset-Backed		1,606.5		1.5		2.3		1,605.7
Certificates of Deposit		1,402.5		—		—		1,402.5
Auction Rate		357.0		14.2		3.4		367.8
Other		610.8		4.2		3.7		611.3
Total	$	19,912.7	$	77.5	$	88.3	$	19,901.9

		0000000		0000000		0000000		0000000
	December 31, 2010
Securities Held to Maturity	Amortized		Gross Unrealized				Fair
(In Millions)	Cost		Gains		Losses		Value
Obligations of States and Political Subdivisions	$	635.0	$	26.2	$	.4	$	660.8
Government Sponsored Agency		169.3		4.6		.2		173.7
Other		117.9		—		10.6		107.3
Total	$	922.2	$	30.8	$	11.2	$	941.8

Maturity of Securities

The following table provides the remaining maturity of securities as of September 30, 2011.

(In Millions)	Amortized Cost		Fair Value
Available for Sale
Due in One Year or Less	$	11,153.3	$	11,155.2
Due After One Year Through Five Years		15,578.1		15,670.4
Due After Five Years Through Ten Years		851.7		858.7
Due After Ten Years		749.7		755.0
Total		28,332.8		28,439.3
Held to Maturity
Due in One Year or Less		141.6		142.2
Due After One Year Through Five Years		284.9		292.9
Due After Five Years Through Ten Years		240.7		250.8
Due After Ten Years		162.0		161.3
Total	$	829.2	$	847.2

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

Securities Continuous Unrealized Loss Position

The following tables provide information regarding securities that have been in a continuous unrealized loss position for less than 12 months and for 12 months or longer as of September 30, 2011 and December 31, 2010.

Securities with Unrealized     Losses as of September 30, 2011	Less than 12 Months				12 Months or Longer				Total
(In Millions)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
Obligations of States and Political Subdivisions	$	1.0	$	—	$	3.1	$	.1	$	4.1	$	.1
Government Sponsored Agency		5,335.3		11.4		414.1		2.0		5,749.4		13.4
Corporate Debt		408.8		1.3		99.2		1.1		508.0		2.4
Residential Mortgage-Backed		5.6		.2		177.4		32.2		183.0		32.4
Other Asset-Backed		687.8		2.2		87.4		.3		775.2		2.5
Certificates of Deposit		2,034.2		.7		—		—		2,034.2		.7
Auction Rate		63.2		4.9		53.9		4.9		117.1		9.8
Other		260.6		2.0		44.8		10.7		305.4		12.7
Total	$	8,796.5	$	22.7	$	879.9	$	51.3	$	9,676.4	$	74.0

Securities with Unrealized Losses     as of December 31, 2010	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	$	492.9	$	9.8	$	—	$	—	$	492.9	$	9.8
Obligations of States and Political Subdivisions		3.0		—		3.2		.4		6.2		.4
Government Sponsored Agency		980.7		11.0		328.7		2.5		1,309.4		13.5
Corporate Debt		930.6		1.1		475.2		.4		1,405.8		1.5
Residential Mortgage-Backed		—		—		248.8		54.3		248.8		54.3
Other Asset-Backed		513.5		2.2		27.0		.1		540.5		2.3
Auction Rate		77.6		3.3		.7		.1		78.3		3.4
Other		482.2		6.8		36.5		7.5		518.7		14.3
Total	$	3,480.5	$	34.2	$	1,120.1	$	65.3	$	4,600.6	$	99.5

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

September 30, 2011 amortized cost, weighted average ultimate default rates, and loss severity rates for the non-agency residential mortgage-backed securities portfolio, by security type, are provided in the following table.

(In Millions)	September 30, 2011
						Loss Severity Rates
Security Type	Amortized Cost		Weighted Average Ultimate Default Rates			Low			High			Weighted Average
Prime	$	24.4		16.1	%		39.4	%		66.0	%		51.8	%
Alt-A		35.4		41.9			57.9			71.7			68.5
Subprime		120.4		51.1			68.8			86.0			74.4
2nd Lien		35.6		33.1			98.8			100.0			99.5
Total Non-Agency Residential Mortgage-Backed Securities	$	215.8		42.4	%		39.4	%		100.0	%		75.0	%

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, 2011 and 2010.

	Three Months Ended September 30,						Nine Months Ended September 30,
(In Millions)	2011			2010			2011			2010
Changes in OTTI Losses*	$	.5		$	7.3		$	(1.1	)	$	6.6
Noncredit-related Losses Recorded in / (Reclassified from) OCI**		(1.8	)		(21.3	)		(22.2	)		(20.7	)
Net Impairment Losses Recognized in Earnings	$	(1.3	)	$	(14.0	)	$	(23.3	)	$	(14.1	)

* 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.

** 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.

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)	2011			2010		2011			2010
Cumulative Credit-Related Losses on Securities Held – Beginning of Period	$	116.2		$	73.1	$	94.2		$	73.0
Plus: Losses on Newly Identified Impairements		—			.1		1.5			.1
Additional Losses on Previously Identified Impairements		1.3			13.9		21.8			14.0
Less: Losses on Securities Sold During the Period		(49.3	)		—		(49.3	)		—
Cumulative Credit-Related Losses on Securities Held – End of Period	$	68.2		$	87.1	$	68.2		$	87.1

Debt Securities Held for which an Other-Than-Temporary Impairment Loss has been Recognized in the Current Period or Previously

The table below provides information regarding debt securities held as of September 30, 2011 and December 31, 2010, for which an OTTI loss had been recognized in the current period or previously.

(In Millions)	September 30, 2011			December 31, 2010
Fair Value	$	77.9		$	79.9
Amortized Cost Basis		99.9			113.3
Noncredit-related Losses Recognized in OCI		(22.0	)		(33.4	)
Tax Effect		8.1			12.2
Amount Recorded in OCI	$	(13.9	)	$	(21.2	)

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Accumulated Other Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 2011

Accumulated Other Comprehensive Income (Loss)

10. Accumulated Other Comprehensive Income (Loss) – The following tables summarize the components of accumulated other comprehensive income (loss) at September 30, 2011 and 2010, and changes during the three and nine month periods then ended.

	Three Months Ended September 30, 2011												Three Months Ended September 30, 2010
	Beginning									Ending			Beginning									Ending
	Balance									Balance			Balance									Balance
	(Net of			Before Tax			Tax			(Net of			(Net of			Before Tax			Tax			(Net of
(In Millions)	Tax)			Amount			Effect			Tax)			Tax)			Amount			Effect			Tax)
Noncredit-Related Unrealized Losses on Securities OTTI	$	(13.6	)	$	(.4	)	$	.1		$	(13.9	)	$	(35.1	)	$	18.7		$	(6.9	)	$	(23.3	)
Other Unrealized Gains (Losses) on Securities Available for Sale, net		27.6			32.5			(12.3	)		47.8			14.0			(9.9	)		3.8			7.9
Reclassification Adjustments		6.3			2.3			(.8	)		7.8			(.2	)		13.5			(5.1	)		8.2
Net Unrealized Gains (Losses) on Securities Available for Sale		20.3			34.4			(13.0	)		41.7			(21.3	)		22.3			(8.2	)		(7.2	)
Unrealized Gains (Losses) on Cash Flow Hedge Designations		21.3			(24.6	)		9.2			5.9			(17.6	)		43.2			(15.9	)		9.7
Reclassification Adjustments		(2.9	)		(1.9	)		.7			(4.1	)		1.8			7.1			(2.6	)		6.3
Net Unrealized Gains (Losses) on Cash Flow Hedge Designations		18.4			(26.5	)		9.9			1.8			(15.8	)		50.3			(18.5	)		16.0
Foreign Currency Translation Adjustments		2.4			31.2			(30.0	)		3.6			14.3			(44.2	)		44.7			14.8
Pension and Other Postretirement Benefit Adjustments		(296.4	)		—			—			(296.4	)		(303.3	)		—			—			(303.3	)
Reclassification Adjustments		12.0			7.6			(2.8	)		16.8			10.8			6.1			(3.3	)		13.6
Total Pension and Other Postretirement Benefit Adjustments		(284.4	)		7.6			(2.8	)		(279.6	)		(292.5	)		6.1			(3.3	)		(289.7	)
Accumulated Other Comprehensive Income (Loss)	$	(243.3	)	$	46.7		$	(35.9	)	$	(232.5	)	$	(315.3	)	$	34.5		$	14.7		$	(266.1	)

	Nine Months Ended September 30, 2011												Nine Months Ended September 30, 2010
	Beginning									Ending			Beginning								Ending
	Balance									Balance			Balance								Balance
	(Net of			Before Tax			Tax			(Net of			(Net of			Before Tax		Tax			(Net of
(In Millions)	Tax)			Amount			Effect			Tax)			Tax)			Amount		Effect			Tax)
Noncredit-Related Unrealized Losses on Securities OTTI	$	(21.2	)	$	11.5		$	(4.2	)	$	(13.9	)	$	(42.0	)	$	29.6	$	(10.9	)	$	(23.3	)
Other Unrealized Gains (Losses) on Securities Available for Sale, net		7.7			64.2			(24.1	)		47.8			.3			11.9		(4.3	)		7.9
Reclassification Adjustments		—			12.4			(4.6	)		7.8			—			13.1		(4.9	)		8.2
Net Unrealized Gains (Losses) on Securities Available for Sale		(13.5	)		88.1			(32.9	)		41.7			(41.7	)		54.6		(20.1	)		(7.2	)
Unrealized Gains (Losses) on Cash Flow Hedge Designations		11.4			(8.8	)		3.3			5.9			(26.2	)		56.9		(21.0	)		9.7
Reclassification Adjustments		—			(6.5	)		2.4			(4.1	)		—			9.9		(3.6	)		6.3
Net Unrealized Gains (Losses) on Cash Flow Hedge Designations		11.4			(15.3	)		5.7			1.8			(26.2	)		66.8		(24.6	)		16.0
Foreign Currency Translation Adjustments		(7.0	)		19.7			(9.1	)		3.6			11.3			19.5		(16.0	)		14.8
Pension and Other Postretirement Benefit Adjustments		(296.2	)		(.3	)		.1			(296.4	)		(305.0	)		2.2		(.5	)		(303.3	)
Reclassification Adjustments		—			22.6			(5.8	)		16.8			—			18.7		(5.1	)		13.6
Total Pension and Other Postretirement Benefit Adjustments		(296.2	)		22.3			(5.7	)		(279.6	)		(305.0	)		20.9		(5.6	)		(289.7	)
Accumulated Other Comprehensive Income (Loss)	$	(305.3	)	$	114.8		$	(42.0	)	$	(232.5	)	$	(361.6	)	$	161.8	$	(66.3	)	$	(266.1	)

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Debt Securities Held for which an Other-Than-Temporary Impairment Loss has been Recognized in the Current Period or Previously (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Fair Value	$ 77.9	$ 79.9
Amortized Cost Basis	99.9	113.3
Noncredit-related (Losses) Recognized in OCI	(22.0)	(33.4)
Tax Effect	8.1	12.2
Amount Recorded in OCI	$ (13.9)	$ (21.2)

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Variable Interest Entities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Dec. 31, 2010
Leveraged Leasing Transactions
Variable Interest Entity [Line Items]
Funding of asset's cost via an equity interest	20.00%
Funding of asset's cost via third party non recourse debt holders	80.00%
Carrying amounts	$ 743.8	$ 782.3
Tax Credit Structures
Variable Interest Entity [Line Items]
Carrying amounts	252.3	265.4
Liabilities related to unfunded commitments	$ 35.7	$ 35.5

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Computations of Net Income (Loss) Per Common Share (Detail) (USD $) In Millions, except Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding	240,991,491	242,124,461	241,529,793	241,966,279
Net Income	$ 170.4	$ 155.6	$ 473.4	$ 512.4
Net Income Applicable to Common Stock	170.4	155.6	473.4	512.4
Less: Earnings Allocated to Participating Securities	2.0	1.3	5.5	4.2
Earnings Allocated to Common Shares Outstanding	168.4	154.3	467.9	508.2
Basic Net Income Per Common Share	$ 0.70	$ 0.64	$ 1.94	$ 2.10
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding	240,991,491	242,124,461	241,529,793	241,966,279
Plus Stock Option Dilution	202,502	33,966	488,957	455,382
Average Common and Potential Common Shares	241,193,993	242,158,427	242,018,750	242,421,661
Earnings Allocated to Common and Potential Common Shares	$ 168.4	$ 154.3	$ 467.9	$ 508.2
Diluted Net Income Per Common Share	$ 0.70	$ 0.64	$ 1.93	$ 2.10

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Types and Classifications of Risk Management Derivative Instruments Not Formally Designated as Hedges, Including Notional and Fair Values (Detail) (Nondesignated, USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Derivative [Line Items]
Notional Value	$ 479.8	$ 901.8
Asset Fair Value	8.9	13.1
Liability Fair Value	5.6	20.9
Credit Default Swap Contracts | Commercial Loans and Loan Commitments
Derivative [Line Items]
Notional Value	85.5	149.5
Liability Fair Value	0.4	2.8
Foreign Exchange Contracts | Commercial Loans
Derivative [Line Items]
Notional Value	141.9	60.6
Asset Fair Value	4.2	0.1
Liability Fair Value	0.1	0.9
Foreign Exchange Contracts | Forecasted Foreign Currency Denominated Transactions
Derivative [Line Items]
Notional Value	194.1	616.1
Asset Fair Value	4.2	12.3
Liability Fair Value	5.1	16.2
Foreign Exchange Contracts | Net Investments in Non-U.S. Affiliates
Derivative [Line Items]
Notional Value	57.2	61.3
Asset Fair Value	0.5	0.2
Liability Fair Value		0.8
Forward Contracts | Loan Commitments
Derivative [Line Items]
Notional Value	1.1	14.3
Asset Fair Value		0.5
Liability Fair Value		$ 0.2

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Impaired Loans by Segments and Class (Detail) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010		Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Recorded Investment	$ 288.9				$ 288.9				$ 301.2
Unpaid Principal Balance	371.3				371.3				372.3
Specific Reserve	34.8				34.8				51.7
Average Recorded Investment	232.5	[1]	257.6	[1]	292.8	[1]	233.5	[1]
Interest Income Recognized	0.8				2.0
Commercial
Financing Receivable, Impaired [Line Items]
Recorded Investment	132.0				132.0				180.5
Unpaid Principal Balance	174.1				174.1				225.2
Specific Reserve	29.1				29.1				49.3
Average Recorded Investment	112.2				155.6
Interest Income Recognized	0.3				0.4
Commercial | Commercial and Institutional | Impaired Financing Receivables with No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment									17.9
Unpaid Principal Balance									26.1
Commercial | Commercial and Institutional | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment									41.7
Unpaid Principal Balance									47.8
Specific Reserve									19.8
Commercial | Commercial Real Estate | Impaired Financing Receivables with No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	41.9				41.9				43.7
Unpaid Principal Balance	53.7				53.7				62.4
Average Recorded Investment	34.2				34.5
Interest Income Recognized	0.3				0.4
Commercial | Commercial Real Estate | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	52.6				52.6				77.2
Unpaid Principal Balance	68.2				68.2				88.9
Specific Reserve	17.2				17.2				29.5
Average Recorded Investment	45.2				71.0
Commercial | Impaired Financing Receivables with No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	21.5				21.5
Unpaid Principal Balance	27.2				27.2
Average Recorded Investment	20.1				21.0
Commercial | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	16.0				16.0
Unpaid Principal Balance	25.0				25.0
Specific Reserve	11.9				11.9
Average Recorded Investment	12.7				29.1
Personal
Financing Receivable, Impaired [Line Items]
Recorded Investment	156.9				156.9				120.7
Unpaid Principal Balance	197.2				197.2				147.1
Specific Reserve	5.7				5.7				2.4
Average Recorded Investment	120.3				137.2
Interest Income Recognized	0.5				1.6
Personal | Residential Real Estate | Impaired Financing Receivables with No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	138.8				138.8				111.9
Unpaid Principal Balance	178.3				178.3				138.1
Average Recorded Investment	107.9				123.2
Interest Income Recognized	0.5				1.6
Personal | Residential Real Estate | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	11.1				11.1				5.1
Unpaid Principal Balance	11.6				11.6				5.1
Specific Reserve	5.2				5.2				2.4
Average Recorded Investment	7.5				8.3
Personal | Private Client | Impaired Financing Receivables with No Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	5.3				5.3				3.7
Unpaid Principal Balance	5.6				5.6				3.9
Average Recorded Investment	3.2				3.5
Personal | Private Client | Impaired Financing Receivables with Related Allowance
Financing Receivable, Impaired [Line Items]
Recorded Investment	1.7				1.7
Unpaid Principal Balance	1.7				1.7
Specific Reserve	0.5				0.5
Average Recorded Investment	$ 1.7				$ 2.2

[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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Fair Value Measurements - Fair Value Hierarchy

9 Months Ended

Sep. 30, 2011

Fair Value Measurements - Fair Value Hierarchy

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.

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

Northern Trust’s Level 1 assets and liabilities include available for sale investments in U.S. treasury securities and U.S. treasury securities held to fund employee benefit and deferred compensation obligations.

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. Their fair values are determined by external pricing vendors, or in limited cases internally, using widely accepted income-based (discounted cash flow) models that incorporate observable current market yield curves and assumptions regarding anticipated prepayments and defaults.

Level 2 assets and liabilities also include derivative contracts which are valued 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 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 2 other assets represent investments in mutual and collective trust funds held to fund employee benefit and deferred compensation obligations. These investments are valued at the funds’ net asset values based on a market approach.

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 from Northern Trust clients. To estimate their fair value, Northern Trust developed an internal income-based model. The lack of activity in the auction rate security market has resulted in a lack of observable market inputs to incorporate within the model. Therefore, significant inputs to the model include Northern Trust’s own assumptions about future cash flows and appropriate discount rates, both adjusted for credit and liquidity factors. In developing these assumptions, Northern Trust incorporated the contractual terms of the securities, the types of collateral, any credit enhancements available, and relevant market data, where available. Level 3 liabilities include financial guarantees relating to standby letters of credit, a net estimated liability for certain indemnification obligations related to litigation involving Visa Inc. (Visa), and acquisition related contingent consideration liabilities. Northern Trust’s recorded liability for standby letters of credit, reflecting the obligation it has undertaken, is measured as the amount of unamortized fees on these instruments. The fair value of the net estimated liability for Visa related indemnifications is based on a market approach, but requires management to exercise significant judgment given the limited number of market transactions involving identical or comparable liabilities. The fair value of contingent consideration liabilities is determined using an income-based (discounted cash flow) model that incorporates Northern Trust’s own assumptions about future cash flows and appropriate discount rates.

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

The following presents assets and liabilities measured at fair value on a recurring basis as of September 30, 2011 and December 31, 2010, segregated by fair value hierarchy level.

(In Millions)	Level 1		Level 2		Level 3		Netting *			Assets/Liabilities at Fair Value
September 30, 2011
Securities
Available for Sale
U.S. Government	$	2,020.9	$	—	$	—	$	—		$	2,020.9
Obligations of States and Political Subdivisions		—		18.4		—		—			18.4
Government Sponsored Agency		—		16,120.7		—		—			16,120.7
Corporate Debt		—		2,848.6		—		—			2,848.6
Non-U.S. Government		—		204.3		—		—			204.3
Residential Mortgage-Backed		—		183.4		—		—			183.4
Other Asset-Backed		—		1,637.5		—		—			1,637.5
Certificates of Deposit		—		3,544.5		—		—			3,544.5
Auction Rate		—		—		189.6		—			189.6
Other		—		1,671.4		—		—			1,671.4
Total		2,020.9		26,228.8		189.6		—			28,439.3
Trading Account		—		6.3		—		—			6.3
Total		2,020.9		26,235.1		189.6		—			28,445.6
Other Assets
Derivatives
Foreign Exchange Contracts		—		5,226.6		—		—			5,226.6
Interest Rate Swaps		—		348.0		—		—			348.0
Interest Rate Options		—		—		—		—			—
Credit Default Swaps		—		—		—		—			—
Forward Contracts		—		—		—		—			—
Total		—		5,574.6		—		(2,118.1	)		3,456.5
All Other		75.7		38.9		—		—			114.6
Total		75.7		5,613.5		—		(2,118.1	)		3,571.1
Total Assets at Fair Value	$	2,096.6	$	31,848.6	$	189.6	$	(2,118.1	)	$	32,016.7
Other Liabilities
Derivatives
Foreign Exchange Contracts	$	—	$	5,216.8	$	—	$	—		$	5,216.8
Interest Rate Swaps		—		232.3		—		—			232.3
Interest Rate Options		—		—		—		—			—
Credit Default Swaps		—		.4		—		—			.4
Forward Contracts		—		—		—		—			—
Total		—		5,449.5		—		(3,619.3	)		1,830.2
All Other		—		—		102.2		—			102.2
Total Liabilities at Fair Value	$	—	$	5,449.5	$	102.2	$	(3,619.3	)	$	1,932.4

* Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting agreements exist between Northern Trust and the counterparty. As of September 30, 2011, derivative assets and liabilities shown above also include reductions of $62.9 million and $1,564.1 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, 2010
Securities
Available for Sale
U.S. Government	$	658.4	$	—	$	—	$	—		$	658.4
Obligations of States and
Political Subdivisions		—		36.3		—		—			36.3
Government Sponsored Agency		—		11,970.7		—		—			11,970.7
Corporate Debt		—		2,554.0		—		—			2,554.0
Non-U.S. Government		—		440.6		—		—			440.6
Residential Mortgage-Backed		—		254.6		—		—			254.6
Other Asset-Backed		—		1,605.7		—		—			1,605.7
Certificates of Deposit		—		1,402.5		—		—			1,402.5
Auction Rate		—		—		367.8		—			367.8
Other		—		611.3		—		—			611.3
Total		658.4		18,875.7		367.8		—			19,901.9
Trading Account		—		6.8		—		—			6.8
Total		658.4		18,882.5		367.8		—			19,908.7
Other Assets
Derivatives
Foreign Exchange Contracts		—		5,792.8		—		—			5,792.8
Interest Rate Swaps		—		285.8		—		—			285.8
Interest Rate Options		—		.1		—		—			.1
Credit Default Swaps		—		—		—		—			—
Forward Contracts		—		.5		—		—			.5
Total		—		6,079.2		—		(4,449.9	)		1,629.3
All Other		65.9		37.4		—		—			103.3
Total		65.9		6,116.6		—		(4,449.9	)		1,732.6
Total Assets at Fair Value	$	724.3	$	24,999.1	$	367.8	$	(4,449.9	)	$	21,641.3
Other Liabilities
Derivatives
Foreign Exchange Contracts	$	—	$	5,781.3	$	—	$	—		$	5,781.3
Interest Rate Swaps		—		163.7		—		—			163.7
Interest Rate Options		—		.1		—		—			.1
Credit Default Swaps		—		2.8		—		—			2.8
Forward Contracts		—		.2		—		—			.2
Total		—		5,948.1		—		(4,770.9	)		1,177.2
All Other		—		—		58.6		—			58.6
Total Liabilities at Fair Value	$	—	$	5,948.1	$	58.6	$	(4,770.9	)	$	1,235.8

* Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting agreements exist between Northern Trust and the counterparty. As of December 31, 2010, derivative assets and liabilities shown above also include reductions of $2,631.7 million and $2,952.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

The following presents the changes in Level 3 assets for the three and nine months ended September 30, 2011 and 2010.

	Auction Rate Securities
(In Millions)	2011			2010
Three Months Ended September 30
Fair Value at July 1	$	205.1		$	384.9
Total Realized and Unrealized
(Gains) Losses Included in Earnings		(.6	)		(.3	)
Gains (Losses) Included in Other Comprehensive Income		(5.2	)		(1.5	)
Purchases, Issuances, Sales, and Settlements
Sales		—			—
Settlements		(9.7	)		(3.1	)
Fair Value at September 30	$	189.6		$	380.0

	2011			2010
Nine Months Ended September 30
Fair Value at January 1	$	367.8		$	427.7
Total Realized and Unrealized
(Gains) Losses Included in Earnings		(10.2	)		(2.9	)
Gains (Losses) Included in Other Comprehensive Income		(15.8	)		(7.4	)
Purchases, Issuances, Sales, and Settlements
Sales		(1.5	)		(.3	)
Settlements		(150.7	)		(37.1	)
Fair Value at September 30	$	189.6		$	380.0

Northern Trust purchased certain illiquid auction rate securities from clients in 2008 which were recorded at their purchase date fair values and designated as available for sale securities. Subsequent to their purchase, the securities are reported at fair value and unrealized gains and losses are credited or charged, net of the tax effect, to accumulated other comprehensive income (AOCI). As of September 30, 2011 and December 31, 2010, the net unrealized loss related to these securities was $5.0 million ($3.1 million net of tax) and $10.8 million ($6.8 million net of tax), respectively. Realized gains for the three month period ended September 30, 2011 of $.6 million represent redemptions by issuers. Realized gains for the nine month period ended September 30, 2011 of $10.2 million include $10.1 million from redemptions by issuers and $.1 million from sales of securities. Realized gains for the three and nine month period ended September 30, 2010 of $.3 million and $2.9 million, respectively, represent redemptions by issuers. Gains on redemptions and sales are included in interest income and investment security gains (losses), net, respectively, within the consolidated statement of income.

The following presents the changes in Level 3 liabilities for the three and nine months ended September 30, 2011 and 2010.

	Other Liabilities *
(In Millions)	2011			2010
Three Months Ended September 30
Fair Value at July 1	$	55.2		$	81.0
Total Realized and Unrealized (Gains) Losses
Included in Earnings		1.4			(1.7	)
Included in Other Comprehensive Income		—			—
Purchases, Issuances, Sales, and Settlements
Issuances		45.7			1.8
Settlements		(.1	)		(.1	)
Fair Value at September 30	$	102.2		$	81.0
Nine Months Ended September 30
Fair Value at January 1	$	58.6		$	94.4
Total Realized and Unrealized (Gains) Losses
Included in Earnings		2.7			(2.4	)
Included in Other Comprehensive Income		—			—
Purchases, Issuances, Sales, and Settlements
Issuances		53.2			3.1
Settlements		(12.3	)		(14.1	)
Fair Value at September 30	$	102.2		$	81.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at September 30		—			—

* Balances relate to standby letters of credit, contingent consideration liabilities, and the net estimated liability for Visa related indemnifications.

All realized and unrealized gains and losses related to Level 3 liabilities are included in other operating income or other operating expense with the exception of those related to the Visa indemnification liability, which have been presented separately in the consolidated statement of income.

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

The following provides information regarding those assets measured at fair value on a nonrecurring basis at September 30, 2011 and 2010, segregated by fair value hierarchy level.

(In Millions)	Level 1		Level 2		Level 3		Total Fair Value
September 30, 2011
Loans (1)	$	—	$	—	$	46.6	$	46.6
Other Real Estate Owned (2)		—		—		4.0		4.0
Total Assets at Fair Value	$	—	$	—	$	50.6	$	50.6
September 30, 2010
Loans (1)	$	—	$	—	$	74.6	$	74.6
Other Real Estate Owned (2)		—		—		7.4		7.4
Total Assets at Fair Value	$	—	$	—	$	82.0	$	82.0

(1) Northern Trust provided an additional $3.0 million and $1.7 million of specific reserves to reduce the fair value of these loans during the three months ended September 30, 2011 and 2010, respectively. During the nine months ended September 30, 2011 and 2010, these loans were reduced by $10.5 million and $16.1 million, respectively.

(2) Northern Trust charged $1.7 million and $2.6 million through other operating expenses during the three months ended September 30, 2011 and 2010 respectively to reduce the fair values of these Other Real Estate Owned (OREO) properties. During the nine months ended September 30 2011 and 2010, the fair values of these OREO properties were reduced by $1.8 million and $3.8 million, respectively.

The fair values of loan collateral and OREO properties were estimated using a market approach typically supported by third party appraisals, and were subject to adjustments to reflect management’s judgment as to their realizable value.

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, modeled internally, using widely accepted models which are based on an income approach that incorporates current market yield curves and assumptions regarding anticipated prepayments and defaults.

Loans (Excluding Lease Receivables). The fair value of the loan portfolio was estimated using a discounted cash flow methodology based on 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 collectibility.

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.

Affordable Housing Investments. Affordable housing investments are valued at cost, which approximates fair value.

Savings Certificates, Other Time, and Non-U.S. Offices Interest-Bearing Deposits. The fair values of instruments with stated maturities were estimated using an income approach (discounted cash flow) that incorporates market interest rates. Due to their short maturity, the fair value of instruments without stated maturities approximated their fair values.

Senior Notes, Subordinated Debt, Federal Home Loan Bank Borrowings, 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.

Loan Commitments. The fair values of loan commitments represent the amount of unamortized fees on these instruments.

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, and federal reserve deposits and other interest-bearing assets; client security settlement receivables; 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 table summarizes the fair values of financial instruments.

	September 30, 2011				December 31, 2010
(In Millions)	Book Value		Fair Value		Book Value			Fair Value
Assets
Cash and Due from Banks	$	4,336.6	$	4,336.6		$	2,818.0	$	2,818.0
Federal Funds Sold and Resell Agreements		221.8		221.8			160.1		160.1
Interest-Bearing Deposits with Banks		18,944.2		18,944.2			15,351.3		15,351.3
Federal Reserve Deposits and Other Interest-Bearing		6,498.2		6,498.2			10,924.6		10,924.6
Securities
Available for Sale		28,439.3		28,439.3			19,901.9		19,901.9
Held to Maturity		829.2		847.2			922.2		941.8
Trading Account		6.3		6.3			6.8		6.8
Loans (excluding Leases)
Held for Investment		27,369.6		27,603.0			26,747.8		26,814.2
Held for Sale		10.0		10.0			2.2		2.2
Client Security Settlement Receivables		948.2		948.2			701.3		701.3
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		185.3		185.3			185.5		185.5
Affordable Housing Investments		252.3		252.3			265.4		265.4
Liabilities
Deposits
Demand, Noninterest-Bearing, and Savings and Money Market	$	37,401.0	$	37,401.0		$	24,810.3	$	24,810.3
Savings Certificates, Other Time and Non U. S. Offices Interest-Bearing		41,113.0		41,126.0			39,385.4		39,402.1
Federal Funds Purchased		737.8		737.8			3,691.7		3,691.7
Securities Sold under Agreements to Repurchase		339.3		339.3			954.4		954.4
Other Borrowings		817.6		817.6			347.7		347.7
Senior Notes		2,133.5		2,196.1			1,896.1		1,936.5
Long Term Debt (excluding Leases)
Subordinated Debt		1,036.6		1,038.9			1,148.7		1,177.2
Federal Home Loan Bank Borrowings		1,055.0		1,101.9			1,532.5		1,613.5
Floating Rate Capital Debt		276.9		229.9			276.9		223.2
Financial Guarantees		102.2		102.2			58.6		58.6
Loan Commitments		32.8		32.8			32.4		32.4
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	23.7	$	23.7		$	44.9	$	44.9
Liabilities		26.8		26.8			51.4		51.4
Interest Rate Swaps
Assets		154.4		154.4			134.6		134.6
Liabilities		42.8		42.8			15.3		15.3
Credit Default Swaps
Assets		—		—			—		—
Liabilities		.4		.4			2.8		2.8
Forward Contracts
Assets		—		—			.5		.5
Liabilities		—		—			.2		.2
Client-Related and Trading
Foreign Exchange Contracts
Assets		5,202.9		5,202.9			5,747.9		5,747.9
Liabilities		5,190.0		5,190.0			5,729.9		5,729.9
Interest Rate Swaps
Assets		193.6		193.6			151.2		151.2
Liabilities		189.5		189.5			148.4		148.4
Interest Rate Options
Assets		—		—			.1		.1
Liabilities		—		—			.1		.1

XML

Types and Classifications of Derivative Instruments Designated as Hedges (Detail) (Asset And Liability Management, USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Derivative [Line Items]
Notional Value	$ 5,658.2	$ 4,285.4
Fair Value Asset	169.2	166.9
Fair Value Liability	64.4	48.8
Fair Value Hedges | Interest Rate Swap Contracts | Available for Sale Investment Securities
Derivative [Line Items]
Notional Value	1,682.0	860.0
Fair Value Asset	2.0	4.8
Fair Value Liability	42.3	14.9
Fair Value Hedges | Interest Rate Swap Contracts | Senior Notes and Long- Term Subordinated Debt
Derivative [Line Items]
Notional Value	1,100.0	1,100.0
Fair Value Asset	152.4	129.8
Fair Value Liability	0.4	0.4
Foreign Exchange Contracts | Cash Flow Hedges | Forecasted Foreign Currency Denominated Transactions
Derivative [Line Items]
Notional Value	923.9	935.3
Fair Value Asset	11.1	19.3
Fair Value Liability	18.5	15.2
Foreign Exchange Contracts | Net Investment Hedges | Net Investments in Non-U.S. Affiliates
Derivative [Line Items]
Notional Value	1,452.3	1,390.1
Fair Value Asset	3.7	13.0
Fair Value Liability	3.1	18.3
Interest Rate Swap Contracts | Cash Flow Hedges | Available for Sale Investment Securities
Derivative [Line Items]
Notional Value	500.0
Fair Value Liability	$ 0.1

XML

Visa Membership

9 Months Ended

Sep. 30, 2011

Visa Membership

13. Visa Membership – In connection with the initial public offering of shares by Visa Inc. in 2007, Northern Trust, in conjunction with other member banks of Visa U.S.A Inc. (Visa U.S.A.), is obligated to share in losses resulting from certain indemnified litigation involving Visa and is also required to recognize, at its estimated fair value in accordance with GAAP, a guarantee liability arising from such litigation that has not yet settled.

Northern Trust’s net Visa related indemnification liability, included within other liabilities in the consolidated balance sheet, totaled $13.0 million at September 30, 2011 and $23.1 million at December 31, 2010.

Visa has established an escrow account to cover the settlements of, or judgments in, the indemnified litigation. The funding by Visa of its escrow account has resulted in reductions of the future realization of the value of outstanding shares of Visa common stock held by Northern Trust as a member bank of Visa U.S.A. These shares are recorded at their original cost basis of zero and have restrictions as to their sale or transfer. It is expected that additional contributions by Visa to the litigation escrow account will result in additional adjustments to the future realization of the value of the outstanding Visa shares. While the ultimate resolution of outstanding Visa related litigation is highly uncertain and the estimation of any potential losses is highly judgmental, Northern Trust anticipates that the value of its remaining shares of Visa stock will be more than adequate to offset any remaining indemnification liabilities related to Visa litigation.

XML

Changes in the Allowance for Credit Losses by Segment (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at Beginning of Period	$ 345.8	$ 361.6	$ 357.3	$ 340.6
Charge-Offs	(34.9)	(31.8)	(87.5)	(104.8)
Recoveries	6.3	1.5	22.3	5.6
Net Charge-Offs	(28.6)	(30.3)	(65.2)	(99.2)
Provision for Credit Losses	17.5	30.0	42.5	120.0
Effect of Foreign Exchange Rates	(0.1)	0.1
Balance at End of Period	334.6	361.4	334.6	361.4
Commercial
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at Beginning of Period	239.9	265.3	256.7	252.2
Charge-Offs	(16.8)	(17.5)	(45.0)	(61.7)
Recoveries	4.4	0.8	17.5	2.9
Net Charge-Offs	(12.4)	(16.7)	(27.5)	(58.8)
Provision for Credit Losses	(6.4)	12.6	(8.2)	67.9
Effect of Foreign Exchange Rates	(0.1)	0.1
Balance at End of Period	221.0	261.3	221.0	261.3
Personal
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at Beginning of Period	105.9	96.3	100.6	88.4
Charge-Offs	(18.1)	(14.3)	(42.5)	(43.1)
Recoveries	1.9	0.7	4.8	2.7
Net Charge-Offs	(16.2)	(13.6)	(37.7)	(40.4)
Provision for Credit Losses	23.9	17.4	50.7	52.1
Balance at End of Period	$ 113.6	$ 100.1	$ 113.6	$ 100.1

XML

Number of Loans and Leases Modified in Troubled Debt Restructurings During the Previous 12 months which Became Nonperforming as well as the Recorded Investment and Unpaid Principal Balance of Those TDRs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011 Contract	Sep. 30, 2011 Contract
Number of Loans and Lease	33	133
Recorded Investment	$ 23.1	$ 70.0
Unpaid Principal Balance	27.8	84.0
Commercial
Number of Loans and Lease	8	19
Recorded Investment	16.0	48.0
Unpaid Principal Balance	18.7	56.1
Commercial | Commercial Real Estates
Number of Loans and Lease	6	14
Recorded Investment	10.6	39.4
Unpaid Principal Balance	12.3	46.0
Commercial | Commercial and Institutional
Number of Loans and Lease	2	5
Recorded Investment	5.4	8.6
Unpaid Principal Balance	6.4	10.1
Personal
Number of Loans and Lease	25	114
Recorded Investment	7.1	22.0
Unpaid Principal Balance	9.1	27.9
Personal | Residential Real Estate
Number of Loans and Lease	25	113
Recorded Investment	7.1	22.0
Unpaid Principal Balance	$ 9.1	$ 27.9
Personal | Private Client
Number of Loans and Lease		1

XML

Share-Based Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2011

Compensation Expense for Share-Based Payment Arrangements and the Associated Tax Impacts

Total compensation expense for share-based payment arrangements and the associated tax impacts were as follows for the periods presented:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions)	2011		2010		2011		2010
Stock Options	$	6.3	$	5.3	$	27.8	$	22.6
Stock and Stock Unit Awards		9.4		6.1		26.6		18.3
Total Share-Based Compensation Expense		15.7		11.4		54.4		40.9
Tax Benefits Recognized	$	5.8	$	4.2	$	20.2	$	15.0

XML

Goodwill and Other Intangibles - Additional Information (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended		1 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Jun. 01, 2011 Bank of Ireland Securities Services (BoISS)	Jul. 29, 2011 Omnium LLC
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense related to other intangible assets	$ 5.3	$ 3.4	$ 11.5	$ 11.0
Estimated future amortization expense for remainder of 2011			5.0
Estimated future amortization expense for 2012			21.0
Estimated future amortization expense for 2013			20.8
Estimated future amortization expense for 2014			20.7
Estimated future amortization expense for 2015			11.8
Business acquisition purchase price adjustment period					1 year	5 years
Business acquisition purchase price					84.4	145.1
Business acquisition cash paid					71.0	101.6
Business acquisition contingent consideration					13.4	43.5
Business acquisition purchase price allocated to goodwill					30.0	102.1
Business acquisition purchase price allocated to other intangible assets					$ 45.0	$ 45.4

XML

Fair Value Measurements - Fair Value Hierarchy (Tables)

9 Months Ended

Sep. 30, 2011

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following presents assets and liabilities measured at fair value on a recurring basis as of September 30, 2011 and December 31, 2010, segregated by fair value hierarchy level.

(In Millions)	Level 1		Level 2		Level 3		Netting *			Assets/Liabilities at Fair Value
September 30, 2011
Securities
Available for Sale
U.S. Government	$	2,020.9	$	—	$	—	$	—		$	2,020.9
Obligations of States and Political Subdivisions		—		18.4		—		—			18.4
Government Sponsored Agency		—		16,120.7		—		—			16,120.7
Corporate Debt		—		2,848.6		—		—			2,848.6
Non-U.S. Government		—		204.3		—		—			204.3
Residential Mortgage-Backed		—		183.4		—		—			183.4
Other Asset-Backed		—		1,637.5		—		—			1,637.5
Certificates of Deposit		—		3,544.5		—		—			3,544.5
Auction Rate		—		—		189.6		—			189.6
Other		—		1,671.4		—		—			1,671.4
Total		2,020.9		26,228.8		189.6		—			28,439.3
Trading Account		—		6.3		—		—			6.3
Total		2,020.9		26,235.1		189.6		—			28,445.6
Other Assets
Derivatives
Foreign Exchange Contracts		—		5,226.6		—		—			5,226.6
Interest Rate Swaps		—		348.0		—		—			348.0
Interest Rate Options		—		—		—		—			—
Credit Default Swaps		—		—		—		—			—
Forward Contracts		—		—		—		—			—
Total		—		5,574.6		—		(2,118.1	)		3,456.5
All Other		75.7		38.9		—		—			114.6
Total		75.7		5,613.5		—		(2,118.1	)		3,571.1
Total Assets at Fair Value	$	2,096.6	$	31,848.6	$	189.6	$	(2,118.1	)	$	32,016.7
Other Liabilities
Derivatives
Foreign Exchange Contracts	$	—	$	5,216.8	$	—	$	—		$	5,216.8
Interest Rate Swaps		—		232.3		—		—			232.3
Interest Rate Options		—		—		—		—			—
Credit Default Swaps		—		.4		—		—			.4
Forward Contracts		—		—		—		—			—
Total		—		5,449.5		—		(3,619.3	)		1,830.2
All Other		—		—		102.2		—			102.2
Total Liabilities at Fair Value	$	—	$	5,449.5	$	102.2	$	(3,619.3	)	$	1,932.4

* Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting agreements exist between Northern Trust and the counterparty. As of September 30, 2011, derivative assets and liabilities shown above also include reductions of $62.9 million and $1,564.1 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, 2010
Securities
Available for Sale
U.S. Government	$	658.4	$	—	$	—	$	—		$	658.4
Obligations of States and
Political Subdivisions		—		36.3		—		—			36.3
Government Sponsored Agency		—		11,970.7		—		—			11,970.7
Corporate Debt		—		2,554.0		—		—			2,554.0
Non-U.S. Government		—		440.6		—		—			440.6
Residential Mortgage-Backed		—		254.6		—		—			254.6
Other Asset-Backed		—		1,605.7		—		—			1,605.7
Certificates of Deposit		—		1,402.5		—		—			1,402.5
Auction Rate		—		—		367.8		—			367.8
Other		—		611.3		—		—			611.3
Total		658.4		18,875.7		367.8		—			19,901.9
Trading Account		—		6.8		—		—			6.8
Total		658.4		18,882.5		367.8		—			19,908.7
Other Assets
Derivatives
Foreign Exchange Contracts		—		5,792.8		—		—			5,792.8
Interest Rate Swaps		—		285.8		—		—			285.8
Interest Rate Options		—		.1		—		—			.1
Credit Default Swaps		—		—		—		—			—
Forward Contracts		—		.5		—		—			.5
Total		—		6,079.2		—		(4,449.9	)		1,629.3
All Other		65.9		37.4		—		—			103.3
Total		65.9		6,116.6		—		(4,449.9	)		1,732.6
Total Assets at Fair Value	$	724.3	$	24,999.1	$	367.8	$	(4,449.9	)	$	21,641.3
Other Liabilities
Derivatives
Foreign Exchange Contracts	$	—	$	5,781.3	$	—	$	—		$	5,781.3
Interest Rate Swaps		—		163.7		—		—			163.7
Interest Rate Options		—		.1		—		—			.1
Credit Default Swaps		—		2.8		—		—			2.8
Forward Contracts		—		.2		—		—			.2
Total		—		5,948.1		—		(4,770.9	)		1,177.2
All Other		—		—		58.6		—			58.6
Total Liabilities at Fair Value	$	—	$	5,948.1	$	58.6	$	(4,770.9	)	$	1,235.8

* Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting agreements exist between Northern Trust and the counterparty. As of December 31, 2010, derivative assets and liabilities shown above also include reductions of $2,631.7 million and $2,952.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.

Changes in Level 3 Assets

The following presents the changes in Level 3 assets for the three and nine months ended September 30, 2011 and 2010.

	Auction Rate Securities
(In Millions)	2011			2010
Three Months Ended September 30
Fair Value at July 1	$	205.1		$	384.9
Total Realized and Unrealized
(Gains) Losses Included in Earnings		(.6	)		(.3	)
Gains (Losses) Included in Other Comprehensive Income		(5.2	)		(1.5	)
Purchases, Issuances, Sales, and Settlements
Sales		—			—
Settlements		(9.7	)		(3.1	)
Fair Value at September 30	$	189.6		$	380.0

	2011			2010
Nine Months Ended September 30
Fair Value at January 1	$	367.8		$	427.7
Total Realized and Unrealized
(Gains) Losses Included in Earnings		(10.2	)		(2.9	)
Gains (Losses) Included in Other Comprehensive Income		(15.8	)		(7.4	)
Purchases, Issuances, Sales, and Settlements
Sales		(1.5	)		(.3	)
Settlements		(150.7	)		(37.1	)
Fair Value at September 30	$	189.6		$	380.0

Changes in Level 3 Liabilities

The following presents the changes in Level 3 liabilities for the three and nine months ended September 30, 2011 and 2010.

	Other Liabilities *
(In Millions)	2011			2010
Three Months Ended September 30
Fair Value at July 1	$	55.2		$	81.0
Total Realized and Unrealized (Gains) Losses
Included in Earnings		1.4			(1.7	)
Included in Other Comprehensive Income		—			—
Purchases, Issuances, Sales, and Settlements
Issuances		45.7			1.8
Settlements		(.1	)		(.1	)
Fair Value at September 30	$	102.2		$	81.0
Nine Months Ended September 30
Fair Value at January 1	$	58.6		$	94.4
Total Realized and Unrealized (Gains) Losses
Included in Earnings		2.7			(2.4	)
Included in Other Comprehensive Income		—			—
Purchases, Issuances, Sales, and Settlements
Issuances		53.2			3.1
Settlements		(12.3	)		(14.1	)
Fair Value at September 30	$	102.2		$	81.0
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at September 30		—			—

* Balances relate to standby letters of credit, contingent consideration liabilities, and the net estimated liability for Visa related indemnifications.

Assets Measured at Fair Value on a Nonrecurring Basis

The following provides information regarding those assets measured at fair value on a nonrecurring basis at September 30, 2011 and 2010, segregated by fair value hierarchy level.

(In Millions)	Level 1		Level 2		Level 3		Total Fair Value
September 30, 2011
Loans (1)	$	—	$	—	$	46.6	$	46.6
Other Real Estate Owned (2)		—		—		4.0		4.0
Total Assets at Fair Value	$	—	$	—	$	50.6	$	50.6
September 30, 2010
Loans (1)	$	—	$	—	$	74.6	$	74.6
Other Real Estate Owned (2)		—		—		7.4		7.4
Total Assets at Fair Value	$	—	$	—	$	82.0	$	82.0

(1) Northern Trust provided an additional $3.0 million and $1.7 million of specific reserves to reduce the fair value of these loans during the three months ended September 30, 2011 and 2010, respectively. During the nine months ended September 30, 2011 and 2010, these loans were reduced by $10.5 million and $16.1 million, respectively.

(2) Northern Trust charged $1.7 million and $2.6 million through other operating expenses during the three months ended September 30, 2011 and 2010 respectively to reduce the fair values of these Other Real Estate Owned (OREO) properties. During the nine months ended September 30 2011 and 2010, the fair values of these OREO properties were reduced by $1.8 million and $3.8 million, respectively.

Book and Fair Values of Financial Instruments

The following table summarizes the fair values of financial instruments.

	September 30, 2011				December 31, 2010
(In Millions)	Book Value		Fair Value		Book Value			Fair Value
Assets
Cash and Due from Banks	$	4,336.6	$	4,336.6		$	2,818.0	$	2,818.0
Federal Funds Sold and Resell Agreements		221.8		221.8			160.1		160.1
Interest-Bearing Deposits with Banks		18,944.2		18,944.2			15,351.3		15,351.3
Federal Reserve Deposits and Other Interest-Bearing		6,498.2		6,498.2			10,924.6		10,924.6
Securities
Available for Sale		28,439.3		28,439.3			19,901.9		19,901.9
Held to Maturity		829.2		847.2			922.2		941.8
Trading Account		6.3		6.3			6.8		6.8
Loans (excluding Leases)
Held for Investment		27,369.6		27,603.0			26,747.8		26,814.2
Held for Sale		10.0		10.0			2.2		2.2
Client Security Settlement Receivables		948.2		948.2			701.3		701.3
Other Assets
Federal Reserve and Federal Home Loan Bank Stock		185.3		185.3			185.5		185.5
Affordable Housing Investments		252.3		252.3			265.4		265.4
Liabilities
Deposits
Demand, Noninterest-Bearing, and Savings and Money Market	$	37,401.0	$	37,401.0		$	24,810.3	$	24,810.3
Savings Certificates, Other Time and Non U. S. Offices Interest-Bearing		41,113.0		41,126.0			39,385.4		39,402.1
Federal Funds Purchased		737.8		737.8			3,691.7		3,691.7
Securities Sold under Agreements to Repurchase		339.3		339.3			954.4		954.4
Other Borrowings		817.6		817.6			347.7		347.7
Senior Notes		2,133.5		2,196.1			1,896.1		1,936.5
Long Term Debt (excluding Leases)
Subordinated Debt		1,036.6		1,038.9			1,148.7		1,177.2
Federal Home Loan Bank Borrowings		1,055.0		1,101.9			1,532.5		1,613.5
Floating Rate Capital Debt		276.9		229.9			276.9		223.2
Financial Guarantees		102.2		102.2			58.6		58.6
Loan Commitments		32.8		32.8			32.4		32.4
Derivative Instruments
Asset/Liability Management
Foreign Exchange Contracts
Assets	$	23.7	$	23.7		$	44.9	$	44.9
Liabilities		26.8		26.8			51.4		51.4
Interest Rate Swaps
Assets		154.4		154.4			134.6		134.6
Liabilities		42.8		42.8			15.3		15.3
Credit Default Swaps
Assets		—		—			—		—
Liabilities		.4		.4			2.8		2.8
Forward Contracts
Assets		—		—			.5		.5
Liabilities		—		—			.2		.2
Client-Related and Trading
Foreign Exchange Contracts
Assets		5,202.9		5,202.9			5,747.9		5,747.9
Liabilities		5,190.0		5,190.0			5,729.9		5,729.9
Interest Rate Swaps
Assets		193.6		193.6			151.2		151.2
Liabilities		189.5		189.5			148.4		148.4
Interest Rate Options
Assets		—		—			.1		.1
Liabilities		—		—			.1		.1

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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net Income	$ 170.4	$ 155.6	$ 473.4	$ 512.4
Other Comprehensive Income (Loss) (Net of Tax and Reclassifications)
Net Unrealized Gains on Securities Available for Sale	21.4	14.1	55.2	34.5
Net Unrealized Gains (Losses) on Cash Flow Hedges	(16.6)	31.8	(9.6)	42.2
Foreign Currency Translation Adjustments	1.2	0.5	10.6	3.5
Pension and Other Postretirement Benefit Adjustments	4.8	2.8	16.6	15.3
Other Comprehensive Income	10.8	49.2	72.8	95.5
Comprehensive Income	$ 181.2	$ 204.8	$ 546.2	$ 607.9

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Income Taxes

9 Months Ended

Sep. 30, 2011

Income Taxes

14. Income Taxes – Income tax expense of $82.4 million was recorded in the current quarter, representing an effective tax rate of 32.6%. The prior year quarter provision for income taxes was $81.8 million, representing an effective tax rate of 34.5%. The current quarter’s effective tax rate reflects a higher portion of income being generated in jurisdictions with lower tax rates than the U.S.

As part of its audit of federal tax returns filed from 1997-2004, the Internal Revenue Service (IRS) challenged the Corporation’s tax position with respect to certain structured leasing transactions and proposed to disallow certain tax deductions and assess related interest and penalties. In September 2009, the Corporation reached a settlement agreement with the IRS with respect to certain of these transactions. The Corporation is in settlement discussions with the IRS Appeals Office regarding the remaining disputed structured leasing transactions. The IRS may continue to disallow deductions relating to the remaining challenged leases and possibly include other lease transactions with similar characteristics as part of its audit of tax returns filed after 2004. The Corporation believes that these transactions are valid leases for U.S. tax purposes and that its tax treatment of these transactions is appropriate based on its interpretation of the tax regulations and legal precedents; a court or other judicial authority, however, could disagree. The Corporation believes it has appropriate reserves to cover its tax liabilities, including liabilities related to structured leasing transactions, and related interest and penalties. Northern Trust has deposits with the IRS to mitigate interest that would become due should the IRS prevail on the remaining tax positions.

There have been no changes to the December 31, 2010 leveraged lease related uncertain tax position balance of $66.7 million. In light of the settlement discussions with the IRS Appeals Office, it is anticipated that the remaining unrecognized tax benefits related to leasing transactions will be settled by early 2012. It is possible that additional changes in the amount of leveraged lease related uncertain tax positions and related cash flows could occur in the next twelve months if Northern Trust terminates some or all of these leases, is not able to resolve this matter with the IRS, or if management becomes aware of new information that would lead it to change its assumptions regarding the timing or amount of any potential payments to the IRS. Management does not believe that future changes, if any, would have a material effect on the consolidated financial position or liquidity of Northern Trust, although they could have a material effect on operating results for a particular period.

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Fair Value Measurements - Fair Value Hierarchy - Additional Information (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Fair Value, Measurement Inputs, Disclosure [Line Items]
Net unrealized gain and loss related to securities, before tax	$ 168.3		$ 168.3		$ 77.5
Auction Rate
Fair Value, Measurement Inputs, Disclosure [Line Items]
Net unrealized gain and loss related to securities, before tax	5.0		5.0		10.8
Net unrealized gain and loss related to securities, net of tax	3.1		3.1		6.8
Realized gains on securites	0.6	0.3	10.2	2.9
Auction Rate | Redemptions by Issuers
Fair Value, Measurement Inputs, Disclosure [Line Items]
Realized gains on securites	0.6	0.3	10.1	2.9
Auction Rate | Sales of Securities
Fair Value, Measurement Inputs, Disclosure [Line Items]
Realized gains on securites			$ 0.1

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Debt Issuance - Additional Information (Detail) (Senior Unsecured Notes, 3.375 Percent, Due August 23, 2021, USD $) In Millions, unless otherwise specified	0 Months Ended
	Aug. 22, 2011
Senior Unsecured Notes, 3.375 Percent, Due August 23, 2021
Debt Disclosure [Line Items]
Stated amount	$ 500
Stated interest rate	3.375%
Maturity	Aug. 23, 2021
Discount rate	0.437%

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Share-Based Compensation Plans

9 Months Ended

Sep. 30, 2011

Share-Based Compensation Plans

16. Share-Based Compensation Plans – The Amended and Restated Northern Trust Corporation 2002 Stock Plan provides for the grant of nonqualified stock options, incentive stock options, stock appreciation rights, stock awards, stock units, and performance shares. Total compensation expense for share-based payment arrangements and the associated tax impacts were as follows for the periods presented:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions)	2011		2010		2011		2010
Stock Options	$	6.3	$	5.3	$	27.8	$	22.6
Stock and Stock Unit Awards		9.4		6.1		26.6		18.3
Total Share-Based Compensation Expense		15.7		11.4		54.4		40.9
Tax Benefits Recognized	$	5.8	$	4.2	$	20.2	$	15.0

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Earnings Contribution of Northern Trust's Business Units (Parenthetical) (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Segment Reporting Information [Line Items]
Fully taxable equivalent basis adjustments	$ 9.8	$ 9.5	$ 30.8	$ 28.8

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Changes in Carrying Amounts of Goodwill by Business Unit (Detail) (USD $) In Millions	3 Months Ended
	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011
Goodwill [Line Items]
Beginning Balance	$ 434.9	$ 405.8	$ 400.9
Goodwill Acquired	102.1	30.0
Other Changes	(2.9)	(0.9)	4.9
Ending Balance	534.1	434.9	405.8
Corporate and Institutional Services
Goodwill [Line Items]
Beginning Balance	363.4	334.3	329.5
Goodwill Acquired	102.1	30.0
Other Changes	(2.8)	(0.9)	4.8
Ending Balance	462.7	363.4	334.3
Personal Financial Services
Goodwill [Line Items]
Beginning Balance	71.5		71.4
Other Changes	(0.1)		0.1
Ending Balance	$ 71.4		$ 71.5

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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) In Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2009		$ 408.6	$ 888.3	$ 5,576.0	$ (361.6)	$ (199.2)
Net Unrealized Gains on Securities Available for Sale					34.5
Stock Options and Awards			(19.4)			35.7
Net Income	512.4			512.4
Net Unrealized Gains (Losses) on Cash Flow Hedges					42.2
Stock Options and Awards - Amortization			41.7
Stock Purchased						(5.8)
Dividends Declared - Common Stock				(204.6)
Foreign Currency Translation Adjustments	3.5				3.5
Stock Options and Awards - Tax Benefits			1.1
Pension and Other Postretirement Benefit Adjustments	15.3				15.3
Ending Balance at Sep. 30, 2010	6,768.7	408.6	911.7	5,883.8	(266.1)	(169.3)
Beginning Balance at Dec. 31, 2010	6,830.3	408.6	920.0	5,972.1	(305.3)	(165.1)
Net Unrealized Gains on Securities Available for Sale					55.2
Stock Options and Awards			(11.9)			16.7
Net Income	473.4			473.4
Net Unrealized Gains (Losses) on Cash Flow Hedges					(9.6)
Stock Options and Awards - Amortization			55.4
Stock Purchased						(78.1)
Dividends Declared - Common Stock				(205.2)
Foreign Currency Translation Adjustments	10.6				10.6
Stock Options and Awards - Tax Benefits			(0.6)
Pension and Other Postretirement Benefit Adjustments	16.6				16.6
Ending Balance at Sep. 30, 2011	$ 7,152.8	$ 408.6	$ 962.9	$ 6,240.3	$ (232.5)	$ (226.5)

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Goodwill and Other Intangibles

9 Months Ended

Sep. 30, 2011

Goodwill and Other Intangibles

8. Goodwill and Other Intangibles – Changes in the carrying amount of goodwill by business unit for the three months ended March 31, 2011, June 30, 2011, and September 30, 2011 were as follows:

(In Millions)	Corporate and Institutional  Services			Personal Financial Services			Total
Balance at December 31, 2010	$	329.5		$	71.4		$	400.9
Other Changes		4.8			.1			4.9
Balance at March 31, 2011		334.3			71.5			405.8
Goodwill Acquired		30.0			—			30.0
Other Changes		(.9	)		—			(.9	)
Balance at June 30, 2011	$	363.4		$	71.5		$	434.9
Goodwill Acquired		102.1			—			102.1
Other Changes		(2.8	)		(.1	)		(2.9	)
Balance at September 30, 2011	$	462.7		$	71.4		$	534.1

Note: Amounts include the effect of foreign exchange rates on non-U.S. dollar denominated goodwill.

Other intangible assets are included in other assets in the consolidated balance sheet. The gross carrying amount and accumulated amortization of other intangible assets subject to amortization at September 30, 2011 and December 31, 2010 were as follows:

	September 30,		December 31,
(In Millions)	2011		2010
Gross Carrying Amount	$	252.5	$	164.2
Less: Accumulated Amortization		122.5		111.0
Net Book Value	$	130.0	$	53.2

Note: Amounts include the effect of foreign exchange rates on non-U.S. dollar denominated intangible assets.

Other intangible assets consist primarily of the value of acquired client relationships. Amortization expense related to other intangible assets totaled $5.3 million and $3.4 million for the three months ended September 30, 2011 and 2010, respectively, and totaled $11.5 million and $11.0 million for the nine months ended September 30, 2011 and 2010, respectively. Amortization for the remainder of 2011 and for the years 2012, 2013, 2014, and 2015 is estimated to be $5.0 million, $21.0 million, $20.8 million, $20.7 million and $11.8 million, respectively.

On June 1, 2011, Northern Trust completed its acquisition of the fund administration, investment operations outsourcing and custody business of Bank of Ireland Securities Services (BoISS). The purchase price, which is subject to certain performance-related adjustments over a one year period after the acquisition date, totaled $84.4 million and was comprised of $71.0 million of cash and of $13.4 million of contingent consideration. Goodwill and other intangible assets associated with the acquisition totaled $30.0 million and $45.0 million, respectively.

On July 29, 2011, Northern Trust completed its acquisition of Omnium LLC, a hedge fund administrator. The purchase price, which is subject to certain performance-related adjustments over a five year period after the acquisition date, totaled $145.1 million and was comprised of $101.6 million of cash and $43.5 million of contingent consideration. Goodwill and other intangible assets associated with the acquisition totaled $102.1 million and $45.4 million, respectively.

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Credit-Related Losses Recognized in Earnings on Debt Securities Other-than-temporarily Impaired (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Cumulative Credit-Related Losses on Securities Held - Beginning of Period	$ 116.2	$ 73.1	$ 94.2	$ 73.0
Plus: Losses on Newly Identified Impairments		0.1	1.5	0.1
Additional Losses on Previously Identified Impairments	1.3	13.9	21.8	14.0
Less: Losses on Securities Sold During the Period	(49.3)		(49.3)
Cumulative Credit-Related Losses on Securities Held - End of Period	$ 68.2	$ 87.1	$ 68.2	$ 87.1

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Credit Quality Indicators (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	$ 28,691.4	$ 28,132.0
Commercial | Below Average Risk
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	3,273.0	2,821.5
Commercial Real Estate	1,291.6	1,232.8
Lease Financing, net	536.6	571.6
Non-U.S.	612.5	430.0
Other	400.4	209.5
Total Loans and Leases	6,114.1	5,265.4
Personal | Below Average Risk
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	2,739.1	2,896.0
Private Client	3,059.1	3,326.5
Other	120.1	78.1
Total Loans and Leases	5,918.3	6,300.6
Below Average Risk
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	12,032.4	11,566.0
Commercial | Average Risk
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	2,974.6	2,849.8
Commercial Real Estate	1,362.8	1,594.3
Lease Financing, net	464.1	473.0
Non-U.S.	687.3	596.5
Other	73.4	137.1
Total Loans and Leases	5,562.2	5,650.7
Personal | Average Risk
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	7,631.8	7,586.9
Private Client	2,335.4	2,064.1
Other	151.9	161.9
Total Loans and Leases	10,119.1	9,812.9
Average Risk
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	15,681.3	15,463.6
Commercial | Watch List
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	210.4	243.2
Commercial Real Estate	303.8	415.3
Lease Financing, net	13.4	19.1
Non-U.S.	15.4	19.7
Total Loans and Leases	543.0	697.3
Personal | Watch List
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	401.5	372.0
Private Client	33.2	33.1
Total Loans and Leases	434.7	405.1
Watch List
Financing Receivable, Recorded Investment [Line Items]
Total Loans and Leases	977.7	1,102.4
Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial and Institutional	6,458.0	5,914.5
Commercial Real Estate	2,958.2	3,242.4
Lease Financing, net	1,014.1	1,063.7
Non-U.S.	1,315.2	1,046.2
Other	473.8	346.6
Total Loans and Leases	12,219.3	11,613.4
Personal
Financing Receivable, Recorded Investment [Line Items]
Residential Real Estate	10,772.4	10,854.9
Private Client	5,427.7	5,423.7
Other	272.0	240.0
Total Loans and Leases	$ 16,472.1	$ 16,518.6

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Other Intangible Assets Subject to Amortization (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 252.5	$ 164.2
Less: Accumulated Amortization	122.5	111.0
Net Book Value	$ 130.0	$ 53.2

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Business Units (Tables)

9 Months Ended

Sep. 30, 2011

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, 2011 and 2010.

Three Months Ended	Corporate and						Personal Financial						Treasury and						Total
September 30,	Institutional Services						Services						Other						Consolidated
($ In Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Noninterest Income
Trust, Investment and Other Servicing Fees	$	310.9		$	293.2		$	244.4		$	225.5		$	—		$	—		$	555.3		$	518.7
Other		125.0			114.9			30.7			33.3			3.7			(10.9	)		159.4			137.3
Net Interest Income (FTE)*		71.2			67.2			157.1			151.0			38.3			24.8			266.6			243.0
Revenues*		507.1			475.3			432.2			409.8			42.0			13.9			981.3			899.0
Provision for Credit Losses		(1.9	)		(2.8	)		19.4			32.8			—			—			17.5			30.0
Noninterest Expenses		375.8			330.6			300.6			274.6			24.8			16.9			701.2			622.1
Income before Income Taxes*		133.2			147.5			112.2			102.4			17.2			(3.0	)		262.6			246.9
Provision for Income Taxes*		50.3			51.9			44.5			39.0			(2.6	)		.4			92.2			91.3
Net Income	$	82.9		$	95.6		$	67.7		$	63.4		$	19.8		$	(3.4	)	$	170.4			155.6
Percentage of Consolidated Net Income		49	%		61	%		40	%		41	%		11	%		(2	)%		100	%		100	%
Average Assets	$	49,755.5		$	38,701.2		$	23,809.5		$	23,495.9		$	20,464.7		$	12,509.6		$	94,029.7		$	74,706.7

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $9.8 million for 2011 and $9.5 million for 2010.

Nine Months Ended	Corporate and						Personal Financial						Treasury and						Total
September 30,	Institutional Services						Services						Other						Consolidated
($ In Millions)	2011			2010			2011			2010			2011			2010			2011			2010
Noninterest Income
Trust, Investment and Other Servicing Fees	$	890.7		$	906.5		$	737.3		$	670.8		$	—		$	—		$	1,628.0		$	1,577.3
Other		373.8			384.9			94.9			100.0			(19.7	)		(7.3	)		449.0			477.6
Net Interest Income (FTE)*		199.1			207.9			456.6			439.3			112.4			78.3			768.1			725.5
Revenues*		1,463.6			1,499.3			1,288.8			1,210.1			92.7			71.0			2,845.1			2,780.4
Provision for Credit Losses		(18.8	)		(11.3	)		61.3			131.3			—			—			42.5			120.0
Noninterest Expenses		1,096.2			977.9			893.3			814.1			70.0			64.2			2,059.5			1,856.2
Income before Income Taxes*		386.2			532.7			334.2			264.7			22.7			6.8			743.1			804.2
Provision for Income Taxes*		147.4			187.7			132.7			100.5			(10.4	)		3.6			269.7			291.8
Net Income	$	238.8		$	345.0		$	201.5		$	164.2		$	33.1		$	3.2		$	473.4			512.4
Percentage of Consolidated Net Income		50	%		67	%		43	%		32	%		7	%		1	%		100	%		100	%
Average Assets	$	47,079.8		$	37,775.9		$	23,696.1		$	23,527.4		$	19,148.3		$	13,322.8		$	89,924.2		$	74,626.1

* Stated on a fully taxable equivalent basis (FTE). Total consolidated includes FTE adjustments of $30.8 million for 2011 and $28.8 million for 2010.

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Net Interest Income

9 Months Ended

Sep. 30, 2011

Net Interest Income

12. Net Interest Income – The components of net interest income were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions)	2011		2010		2011		2010
Interest Income
Loans and Leases	$	229.8	$	231.9	$	719.5	$	687.0
Securities – Taxable		54.8		47.7		160.4		142.5
– Non-Taxable		6.1		7.3		19.1		22.1
Interest-Bearing Deposits with Banks		49.2		40.2		131.6		100.8
Federal Reserve Deposits and Other		7.2		3.1		23.2		10.0
Total Interest Income		347.1		330.2		1,053.8		962.4
Interest Expense
Deposits		50.1		53.7		187.0		135.1
Federal Funds Purchased		.1		1.0		1.8		3.9
Securities Sold Under Agreements to Repurchase		.1		.2		.6		.7
Other Borrowings		1.4		1.4		4.3		4.0
Senior Notes		16.4		11.5		47.6		34.4
Long-Term Debt		21.6		28.1		73.4		85.8
Floating Rate Capital Debt		.6		.8		1.8		1.8
Total Interest Expense		90.3		96.7		316.5		265.7
Net Interest Income	$	256.8	$	233.5	$	737.3	$	696.7

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CONSOLIDATED BALANCE SHEET (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Assets
Cash and Due from Banks	$ 4,336.6	$ 2,818.0
Federal Funds Sold and Securities Purchased under Agreements to Resell	221.8	160.1
Interest-Bearing Deposits with Banks	18,944.2	15,351.3
Federal Reserve Deposits and Other Interest-Bearing	6,498.2	10,924.6
Securities
Available for Sale	28,439.3	19,901.9
Held to Maturity	829.2	922.2
Trading Account	6.3	6.8
Total Securities	29,274.8	20,830.9
Loans and Leases
Commercial	12,219.3	11,613.4
Personal	16,472.1	16,518.6
Total Loans and Leases	28,691.4	28,132.0
Allowance for Credit Losses Assigned to Loans and Leases	(298.3)	(319.6)
Buildings and Equipment	492.1	504.5
Client Security Settlement Receivables	948.2	701.3
Goodwill	534.1	400.9
Other Assets	6,455.1	4,339.9
Total Assets	96,098.2	83,843.9
Deposits
Demand and Other Noninterest-Bearing	19,487.6	7,658.9
Savings and Money Market	14,538.6	14,208.7
Savings Certificates and Other Time	3,529.4	3,913.0
Non U.S. Offices - Noninterest-Bearing	3,374.8	2,942.7
- Interest-Bearing	37,583.6	35,472.4
Total Deposits	78,514.0	64,195.7
Federal Funds Purchased	737.8	3,691.7
Securities Sold under Agreements to Repurchase	339.3	954.4
Other Borrowings	817.6	347.7
Senior Notes	2,133.5	1,896.1
Long-Term Debt	2,137.3	2,729.3
Floating Rate Capital Debt	276.9	276.9
Other Liabilities	3,989.0	2,921.8
Total Liabilities	88,945.4	77,013.6
Stockholders' Equity
Common Stock, $1.66 2/3 Par Value; Authorized 560,000,000 shares; Outstanding shares of 240,996,807 and 242,268,903	408.6	408.6
Additional Paid-In Capital	962.9	920.0
Retained Earnings	6,240.3	5,972.1
Accumulated Other Comprehensive Loss	(232.5)	(305.3)
Treasury Stock (4,174,717 and 2,902,621 shares, at cost)	(226.5)	(165.1)
Total Stockholders' Equity	7,152.8	6,830.3
Total Liabilities and Stockholders' Equity	$ 96,098.2	$ 83,843.9

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Net Income Per Common Share Computations (Tables)

9 Months Ended

Sep. 30, 2011

Net Income Per Common Share Computations

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

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions Except Share Information)	2011		2010		2011		2010
Basic Net Income Per Common Share
Average Number of Common Shares Outstanding		240,991,491		242,124,461		241,529,793		241,966,279
Net Income	$	170.4	$	155.6	$	473.4	$	512.4
Net Income Applicable to Common Stock		170.4		155.6		473.4		512.4
Less: Earnings Allocated to Participating Securities		2.0		1.3		5.5		4.2
Earnings Allocated to Common Shares Outstanding	$	168.4	$	154.3	$	467.9	$	508.2
Basic Net Income Per Common Share		.70		.64		1.94		2.10
Diluted Net Income Per Common Share
Average Number of Common Shares Outstanding		240,991,491		242,124,461		241,529,793		241,966,279
Plus Stock Option Dilution		202,502		33,966		488,957		455,382
Average Common and Potential Common Shares		241,193,993		242,158,427		242,018,750		242,421,661
Earnings Allocated to Common and Potential Common Shares	$	168.4	$	154.3	$	467.9	$	508.2
Diluted Net Income Per Common Share		.70		.64		1.93		2.10

Note: Common stock equivalents totaling 15,650,249 and 12,420,777 for the three and nine months ended September 30, 2011, respectively, and 6,860,298 and 7,958,582 for the three and nine months ended September 30, 2010, respectively, were not included in the computation of diluted net income per common share because their inclusion would have been antidilutive.

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Net Periodic Pension Expense of Northern Trust's U.S. and Non-U.S. Pension Plans, Supplemental Pension Plan, and Other Postretirement Plan (Detail) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	$ 10.7	$ 9.5	$ 32.1	$ 28.5
Interest Cost	10.2	9.2	30.6	27.6
Expected Return on Plan Assets	(19.7)	(18.3)	(59.1)	(54.9)
Amortization
Net Loss	6.5	5.0	19.5	15.0
Prior Service Cost	0.4	0.4	1.2	1.2
Net Periodic Benefit Expense (Benefit)	8.1	5.8	24.3	17.4
Foreign Pension Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost		0.2		1.8
Interest Cost	1.6	1.9	4.9	5.2
Expected Return on Plan Assets	(2.1)	(2.3)	(6.2)	(6.2)
Amortization
Net Loss	0.1	0.1	0.1	0.5
Gain on Curtailment of Non-U.S. Plan				(2.2)
Net Periodic Benefit Expense (Benefit)	(0.4)	(0.1)	(1.2)	(0.9)
Supplemental Employee Retirement Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.8	0.8	2.4	2.4
Interest Cost	1.1	1.2	3.3	3.6
Amortization
Net Loss	1.4	1.5	4.2	4.5
Prior Service Cost	0.1		0.3
Net Periodic Benefit Expense (Benefit)	3.4	3.5	10.2	10.5
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service Cost	0.1	0.2	0.3	0.6
Interest Cost	0.7	0.7	2.1	2.1
Amortization
Net Loss	0.4	0.5	1.2	1.5
Prior Service Cost	(1.3)	(1.3)	(3.9)	(3.9)
Net Periodic Benefit Expense (Benefit)	$ (0.1)	$ 0.1	$ (0.3)	$ 0.3

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Gains and Losses Recorded in the Consolidated Statement of Income related to Derivative Instruments Not Formally Designated as Hedges (Detail) (Nondesignated, USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount Recognized in Income	$ 7.2	$ (16.3)	$ (5.3)	$ (9.3)
Credit Default Swap Contracts | Other Operating Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount Recognized in Income	1.1	(1.6)	0.3	(1.2)
Foreign Exchange Contracts | Other Operating Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount Recognized in Income	6.1	(14.7)	(5.8)	(8.1)
Forward Contracts | Other Operating Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount Recognized in Income			$ 0.2

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Net Income Per Common Share Computations - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Earnings Per Share Disclosure [Line Items]
Common stock equivalents not included in the computation of diluted earnings per share because their inclusion would have been antidilutive	15,650,249	6,860,298	12,420,777	7,958,582

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Amortized Cost and Fair Values of Securities (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Investment Holdings [Line Items]
Amortized Cost	$ 28,332.8	$ 19,912.7
Gross Unrealized Gains	168.3	77.5
Gross Unrealized Losses	61.8	88.3
Fair Value	28,439.3	19,901.9
Amortized Cost	829.2	922.2
Gross Unrealized Gains	30.2	30.8
Gross Unrealized Losses	12.2	11.2
Fair Value	847.2	941.8
U.S. Government
Investment Holdings [Line Items]
Amortized Cost	1,967.4	667.2
Gross Unrealized Gains	53.5	1.0
Gross Unrealized Losses		9.8
Fair Value	2,020.9	658.4
Obligations of States and Political Subdivisions
Investment Holdings [Line Items]
Amortized Cost	17.5	35.4
Gross Unrealized Gains	0.9	0.9
Fair Value	18.4	36.3
Amortized Cost	553.1	635.0
Gross Unrealized Gains	25.3	26.2
Gross Unrealized Losses	0.1	0.4
Fair Value	578.3	660.8
Government Sponsored Agency
Investment Holdings [Line Items]
Amortized Cost	16,055.4	11,937.0
Gross Unrealized Gains	78.7	47.0
Gross Unrealized Losses	13.4	13.3
Fair Value	16,120.7	11,970.7
Amortized Cost	163.9	169.3
Gross Unrealized Gains	4.9	4.6
Gross Unrealized Losses		0.2
Fair Value	168.8	173.7
Corporate Debt
Investment Holdings [Line Items]
Amortized Cost	2,840.8	2,547.7
Gross Unrealized Gains	10.2	7.8
Gross Unrealized Losses	2.4	1.5
Fair Value	2,848.6	2,554.0
Non-U.S. Government Debt
Investment Holdings [Line Items]
Amortized Cost	204.3	440.6
Fair Value	204.3	440.6
Residential Mortgage-Backed
Investment Holdings [Line Items]
Amortized Cost	215.8	308.0
Gross Unrealized Gains		0.9
Gross Unrealized Losses	32.4	54.3
Fair Value	183.4	254.6
Other Asset-Backed
Investment Holdings [Line Items]
Amortized Cost	1,638.3	1,606.5
Gross Unrealized Gains	1.7	1.5
Gross Unrealized Losses	2.5	2.3
Fair Value	1,637.5	1,605.7
Certificates of Deposit
Investment Holdings [Line Items]
Amortized Cost	3,545.2	1,402.5
Gross Unrealized Losses	0.7
Fair Value	3,544.5	1,402.5
Auction Rate
Investment Holdings [Line Items]
Amortized Cost	194.6	357.0
Gross Unrealized Gains	4.8	14.2
Gross Unrealized Losses	9.8	3.4
Fair Value	189.6	367.8
Other
Investment Holdings [Line Items]
Amortized Cost	1,653.5	610.8
Gross Unrealized Gains	18.5	4.2
Gross Unrealized Losses	0.6	3.7
Fair Value	1,671.4	611.3
Amortized Cost	112.2	117.9
Gross Unrealized Losses	12.1	10.6
Fair Value	$ 100.1	$ 107.3

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Amounts Outstanding in Selected Loan Categories (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 28,691.4	$ 28,132.0
Allowance for Credit Losses Assigned to Loans and Leases	(298.3)	(319.6)
Net Loans and Leases	28,393.1	27,812.4
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and Institutional	6,458.0	5,914.5
Commercial Real Estate	2,958.2	3,242.4
Lease Financing, net	1,014.1	1,063.7
Non-U.S.	1,315.2	1,046.2
Other	473.8	346.6
Total Loans and Leases	12,219.3	11,613.4
Allowance for Credit Losses Assigned to Loans and Leases	(186.4)	(220.7)
Personal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential Real Estate	10,772.4	10,854.9
Private Client	5,427.7	5,423.7
Other	272.0	240.0
Total Loans and Leases	16,472.1	16,518.6
Allowance for Credit Losses Assigned to Loans and Leases	$ (111.9)	$ (98.9)

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Pledged Assets - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	$ 27,400,000,000		$ 27,400,000,000		$ 23,900,000,000
Available for sale securities, pledged as collateral	700,000,000		700,000,000		1,100,000,000
Fair value of accepted collateral	205,400,000		205,400,000		152,100,000
Amount of securities repledged or sold collateral	0		0		0
Average deposits maintained to meet Federal Reserve Bank reserve requirements	467,500,000	186,400,000	307,500,000	257,800,000
US Government Corporations and Agencies Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	16,400,000,000		16,400,000,000		12,800,000,000
Obligations of States and Political Subdivisions
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	458,200,000		458,200,000		576,500,000
Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	10,500,000,000		10,500,000,000		10,500,000,000
Collateral Requirements
Financial Instruments Owned and Pledged as Collateral [Line Items]
Amount of securities and loans pledged	$ 4,100,000,000		$ 4,100,000,000		$ 4,500,000,000

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Changes in Level 3 Liabilities (Detail) (Other Liabilities Member, USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Other Liabilities Member
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value Liabilities Beginning Balance	$ 55.2	[1]	$ 81.0	[1]	$ 58.6	[1]	$ 94.4	[1]
Total Realized and Unrealized (Gains) Losses
Included in Earnings	1.4	[1]	(1.7)	[1]	2.7	[1]	(2.4)	[1]
Included in Other Comprehensive Income		[1]		[1]		[1]		[1]
Purchases, Issuances, Sales, and Settlements
Issuances	45.7	[1]	1.8	[1]	53.2	[1]	3.1	[1]
Settlements	(0.1)	[1]	(0.1)	[1]	(12.3)	[1]	(14.1)	[1]
Fair Value Liabilities Ending Balance	102.2	[1]	81.0	[1]	102.2	[1]	81.0	[1]
Unrealized (Gains) Losses Included in Earnings Related to Financial Instruments Held at Period End						[1]		[1]

[1] Balances relate to standby letters of credit, contingent consideration liabilities, and the net estimated liability for Visa related indemnifications.

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Assets Measured at Fair Value on a Nonrecurring Basis (Detail) (Fair Value, Measurements, Nonrecurring, USD $) In Millions	Sep. 30, 2011		Sep. 30, 2010
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Asset	$ 50.6		$ 82.0
Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Asset	46.6	[1]	74.6	[1]
Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Asset	4.0	[2]	7.4	[2]
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Asset	50.6		82.0
Fair Value, Inputs, Level 3 | Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Asset	46.6	[1]	74.6	[1]
Fair Value, Inputs, Level 3 | Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Asset	$ 4.0	[2]	$ 7.4	[2]

[1] Northern Trust provided an additional $3.0 million and $1.7 million of specific reserves to reduce the fair value of these loans during the three months ended September 30, 2011 and 2010, respectively. During the nine months ended September 30, 2011 and 2010, these loans were reduced by $10.5 million and $16.1 million, respectively.

[2] Northern Trust charged $1.7 million and $2.6 million through other operating expenses during the three months ended September 30, 2011 and 2010 respectively to reduce the fair values of these Other Real Estate Owned (OREO) properties. During the nine months ended September 30 2011 and 2010, the fair values of these OREO properties were reduced by $1.8 million and $3.8 million, respectively.

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Credit Losses on Debt Securities (Detail) (USD $) In Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010		Sep. 30, 2011		Sep. 30, 2010
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Changes in OTTI Losses	$ 0.5	[1]	$ 7.3	[1]	$ (1.1)	[1]	$ 6.6	[1]
Noncredit-related Losses Recorded in/ (Reclassified from) OCI	(1.8)	[2]	(21.3)	[2]	(22.2)	[2]	(20.7)	[2]
Net Impairment Losses Recognized in Earnings	$ (1.3)		$ (14.0)		$ (23.3)		$ (14.1)

[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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Net Interest Income (Tables)

9 Months Ended

Sep. 30, 2011

Net Interest Income

The components of net interest income were as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
(In Millions)	2011		2010		2011		2010
Interest Income
Loans and Leases	$	229.8	$	231.9	$	719.5	$	687.0
Securities – Taxable		54.8		47.7		160.4		142.5
– Non-Taxable		6.1		7.3		19.1		22.1
Interest-Bearing Deposits with Banks		49.2		40.2		131.6		100.8
Federal Reserve Deposits and Other		7.2		3.1		23.2		10.0
Total Interest Income		347.1		330.2		1,053.8		962.4
Interest Expense
Deposits		50.1		53.7		187.0		135.1
Federal Funds Purchased		.1		1.0		1.8		3.9
Securities Sold Under Agreements to Repurchase		.1		.2		.6		.7
Other Borrowings		1.4		1.4		4.3		4.0
Senior Notes		16.4		11.5		47.6		34.4
Long-Term Debt		21.6		28.1		73.4		85.8
Floating Rate Capital Debt		.6		.8		1.8		1.8
Total Interest Expense		90.3		96.7		316.5		265.7
Net Interest Income	$	256.8	$	233.5	$	737.3	$	696.7