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Assets and Liabilities Measured at Fair Value on Recurring Basis Segregated by Fair Value Hierarchy Level (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale $ 28,107.7 $ 28,392.8
Trading Account 4.3 1.7
Contingent Consideration   55.4
Fair Value, Measurements, Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total Available for Sale and Trading Securities 28,112.0 28,394.5
Contingent Consideration   55.4
Fair Value, Measurements, Recurring | Securities Investment
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 28,107.7 28,392.8
Trading Account 4.3 1.7
Fair Value, Measurements, Recurring | Securities Investment | U.S. Government
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,409.6 1,917.9
Fair Value, Measurements, Recurring | Securities Investment | Obligations of States and Political Subdivisions
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 4.6 4.6
Fair Value, Measurements, Recurring | Securities Investment | U.S. Government Sponsored Agency
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 16,174.4 17,528.0
Fair Value, Measurements, Recurring | Securities Investment | Non-U.S. Government
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 310.5 310.6
Fair Value, Measurements, Recurring | Securities Investment | Corporate Debt
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,364.8 3,524.5
Fair Value, Measurements, Recurring | Securities Investment | Covered Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 1,978.9 1,943.9
Fair Value, Measurements, Recurring | Securities Investment | Supranational and Non-U.S. Agency Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 360.2 410.0
Fair Value, Measurements, Recurring | Securities Investment | Residential Mortgage-Backed
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 17.6 48.1
Fair Value, Measurements, Recurring | Securities Investment | Other Asset-Backed
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,233.1 2,391.8
Fair Value, Measurements, Recurring | Securities Investment | Auction Rate Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 85.2 98.9
Fair Value, Measurements, Recurring | Securities Investment | Others
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 168.8 214.5
Fair Value, Measurements, Recurring | Other Assets
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 2,058.9 1,734.6
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 4,203.8 2,865.7
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 213.5 237.9
Fair Value, Measurements, Recurring | Other Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 1,512.8 1,174.9
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 4,141.6 2,905.7
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 123.5 195.2
Fair Value, Measurements, Recurring | Subject to master netting arrangement or similar arrangement | Other Assets
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets (2,358.4) [1] (1,369.0) [2]
Fair Value, Measurements, Recurring | Subject to master netting arrangement or similar arrangement | Other Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities (2,752.3) [1] (1,926.0) [2]
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total Available for Sale and Trading Securities 3,409.6 1,917.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Securities Investment
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,409.6 1,917.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 | Securities Investment | U.S. Government
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,409.6 1,917.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total Available for Sale and Trading Securities 24,617.2 26,377.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 24,612.9 26,376.0
Trading Account 4.3 1.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Obligations of States and Political Subdivisions
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 4.6 4.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | U.S. Government Sponsored Agency
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 16,174.4 17,528.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Non-U.S. Government
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 310.5 310.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Corporate Debt
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,364.8 3,524.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Covered Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 1,978.9 1,943.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Supranational and Non-U.S. Agency Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 360.2 410.0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Residential Mortgage-Backed
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 17.6 48.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Other Asset-Backed
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,233.1 2,391.8
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Others
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 168.8 214.5
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 4,417.3 3,103.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets | Foreign Exchange Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 4,203.8 2,865.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets | Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 213.5 237.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 4,265.1 3,100.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities | Foreign Exchange Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 4,141.6 2,905.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities | Interest Rate Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 123.5 195.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total Available for Sale and Trading Securities 85.2 98.9
Contingent Consideration   55.4
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Securities Investment
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 85.2 98.9
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Securities Investment | Auction Rate Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale $ 85.2 $ 98.9
[1] Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of September 30, 2014, derivative assets and liabilities shown above also include reductions of $207.4 million and $601.3 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.
[2] Northern Trust has elected to net derivative assets and liabilities when legally enforceable master netting arrangements or similar agreements exist between Northern Trust and the counterparty. As of December 31, 2013, derivative assets and liabilities shown above also include reductions of $210.7 million and $767.7 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.