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Assets and Liabilities Measured at Fair Value on Recurring Basis Segregated by Fair Value Hierarchy Level (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale $ 29,689.4 $ 28,392.8
Trading Account 2.7 1.7
Contingent Consideration   55.4
Fair Value, Measurements, Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total Available for Sale and Trading Securities 29,692.1 28,394.5
Contingent Consideration   55.4
Fair Value, Measurements, Recurring | Securities Investment
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 29,689.4 28,392.8
Trading Account 2.7 1.7
Fair Value, Measurements, Recurring | Securities Investment | U.S. Government
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,417.7 1,917.9
Fair Value, Measurements, Recurring | Securities Investment | Obligations of States and Political Subdivisions
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 4.6 4.6
Fair Value, Measurements, Recurring | Securities Investment | U.S. Government Sponsored Agency
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 18,168.9 17,528.0
Fair Value, Measurements, Recurring | Securities Investment | Corporate Debt
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,670.7 3,524.5
Fair Value, Measurements, Recurring | Securities Investment | Covered Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 1,988.8 1,943.9
Fair Value, Measurements, Recurring | Securities Investment | Supranational, Sovereign and Non-U.S. Agency Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 722.3 720.6
Fair Value, Measurements, Recurring | Securities Investment | Residential Mortgage-Backed
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 42.9 48.1
Fair Value, Measurements, Recurring | Securities Investment | Other Asset-Backed
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,391.0 2,391.8
Fair Value, Measurements, Recurring | Securities Investment | Auction Rate Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 98.8 98.9
Fair Value, Measurements, Recurring | Securities Investment | Others
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 183.7 214.5
Fair Value, Measurements, Recurring | Other Assets
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 561.9 1,734.6
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 1,796.9 2,865.7
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 223.7 237.9
Fair Value, Measurements, Recurring | Other Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 495.5 1,174.9
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 1,830.8 2,905.7
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 152.5 195.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total Available for Sale and Trading Securities 2,417.7 1,917.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Securities Investment
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,417.7 1,917.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Securities Investment | U.S. Government
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,417.7 1,917.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total Available for Sale and Trading Securities 27,175.6 26,377.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 27,172.9 26,376.0
Trading Account 2.7 1.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Obligations of States and Political Subdivisions
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 4.6 4.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | U.S. Government Sponsored Agency
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 18,168.9 17,528.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Corporate Debt
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,670.7 3,524.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Covered Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 1,988.8 1,943.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Supranational, Sovereign and Non-U.S. Agency Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 722.3 720.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Residential Mortgage-Backed
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 42.9 48.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Other Asset-Backed
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,391.0 2,391.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Others
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 183.7 214.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 2,020.6 3,103.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets | Foreign Exchange Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 1,796.9 2,865.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets | Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 223.7 237.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 1,983.3 3,100.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities | Foreign Exchange Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 1,830.8 2,905.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities | Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 152.5 195.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total Available for Sale and Trading Securities 98.8 98.9
Contingent Consideration   55.4
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Securities Investment
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 98.8 98.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Securities Investment | Auction Rate Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 98.8 98.9
Fair Value, Measurements, Recurring | Netting and Collateral | Other Assets
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets (1,458.7) [1] (1,369.0) [2]
Fair Value, Measurements, Recurring | Netting and Collateral | Other Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities $ (1,487.8) [1] $ (1,926.0) [2]
[1] Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of June 30, 2014, derivative assets and liabilities shown above also include reductions of $552.0 million and $581.1 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 arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2013, derivative assets and liabilities shown above also include reductions of $210.7 million and $767.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.