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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, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale $ 27,476.5 $ 28,643.5
Trading Account 11.0 8.0
Contingent Consideration 52.7 50.1
Fair Value, Measurements, Recurring
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Total Available for Sale and Trading 27,487.5 28,651.5
Contingent Consideration   50.1
Fair Value, Measurements, Recurring | Securities Investment
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 27,476.5 28,643.5
Trading Account 11.0 8.0
Fair Value, Measurements, Recurring | Securities Investment | U.S. Government
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 1,775.1 1,784.6
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 14.4 14.1
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 16,625.9 18,638.8
Fair Value, Measurements, Recurring | Securities Investment | Corporate Debt
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,550.7 2,618.4
Fair Value, Measurements, Recurring | Securities Investment | Covered Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 1,845.0 1,748.0
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 719.4  
Fair Value, Measurements, Recurring | Securities Investment | Supranational Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale   1,060.7
Fair Value, Measurements, Recurring | Securities Investment | Residential Mortgage-Backed
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 61.0 92.0
Fair Value, Measurements, Recurring | Securities Investment | Other Asset-Backed
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,529.8 2,283.9
Fair Value, Measurements, Recurring | Securities Investment | Auction Rate Securities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 99.1 97.8
Fair Value, Measurements, Recurring | Securities Investment | Others
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 256.1 305.2
Fair Value, Measurements, Recurring | Other Assets
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Assets 3,386.0 965.8
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Assets 4,676.1 1,756.6
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Swap Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Assets 265.7 310.3
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Option
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Assets 0.1  
Fair Value, Measurements, Recurring | Other Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Liabilities 1,109.0 615.5
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Liabilities 4,606.3 1,772.7
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Swap Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Liabilities 182.8 249.3
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Option
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Liabilities 0.1  
Fair Value, Measurements, Recurring | Other Liabilities | Credit Default Swap Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Liabilities 0.1 1.0
Fair Value, Measurements, Recurring | Netting and Collateral | Other Assets
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Assets (1,555.9) [1] (1,101.1) [2]
Fair Value, Measurements, Recurring | Netting and Collateral | Other Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Liabilities (3,680.3) [1] (1,407.5) [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 1,775.1 1,784.6
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 1,775.1 1,784.6
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 1,775.1 1,784.6
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 25,613.3 26,769.1
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 25,602.3 26,761.1
Trading Account 11.0 8.0
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 14.4 14.1
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 16,625.9 18,638.8
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 3,550.7 2,618.4
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 1,845.0 1,748.0
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 719.4  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Securities Investment | Supranational Bonds
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale   1,060.7
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 61.0 92.0
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 2,529.8 2,283.9
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 256.1 305.2
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Assets 4,941.9 2,066.9
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]    
Derivatives Assets 4,676.1 1,756.6
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets | Interest Rate Swap Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Assets 265.7 310.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Assets | Interest Rate Option
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Assets 0.1  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Liabilities 4,789.3 2,023.0
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]    
Derivatives Liabilities 4,606.3 1,772.7
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities | Interest Rate Swap Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Liabilities 182.8 249.3
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities | Interest Rate Option
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Liabilities 0.1  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other Liabilities | Credit Default Swap Contracts
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivatives Liabilities 0.1 1.0
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 99.1 97.8
Contingent Consideration 52.7 50.1
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Securities Investment
    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 99.1 97.8
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 $ 99.1 $ 97.8
[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, 2013, derivative assets and liabilities shown above also include reductions of $68.8 million and $2,193.2 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, 2012, derivative assets and liabilities shown above also include reductions of $118.6 million and $425.0 million, respectively, as a result of cash collateral received from and deposited with derivative counterparties.