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Fair Value Measurements (Recurring Basis Hierarchy Leveling) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale $ 38,920.2 $ 36,888.8
Derivative Assets 2,466.6 2,563.5
Netting (1,114.9) (1,357.1)
Derivative Asset 1,351.7 1,206.4
Derivative Liabilities 2,226.6 2,388.4
Netting (1,507.8) (1,796.3)
Derivative Liabilities 718.8 592.1
Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Netting   (1.3)
Netting 0.0 (1.2)
Cross Product Collateral Adjustment    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Netting (182.3) (134.5)
Netting (575.1) (573.7)
U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 5,653.0 5,185.3
Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 1,147.6 655.9
Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 22,620.1 22,424.6
Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3.3 142.2
Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,585.5 2,294.7
Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 764.2 829.3
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,104.8 2,096.2
Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,209.1 2,657.7
Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 822.4 587.2
Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 10.2 15.7
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 33,300.0 31,700.0
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 38,920.2 36,888.8
Trading Account 1.3 0.3
Total Available for Sale and Trading Debt Securities 38,921.5 36,889.1
Fair Value, Measurements, Recurring | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 5,653.0 5,185.3
Fair Value, Measurements, Recurring | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 1,147.6 655.9
Fair Value, Measurements, Recurring | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 22,620.1 22,424.6
Fair Value, Measurements, Recurring | Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3.3 142.2
Fair Value, Measurements, Recurring | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,585.5 2,294.7
Fair Value, Measurements, Recurring | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 764.2 829.3
Fair Value, Measurements, Recurring | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,104.8 2,096.2
Fair Value, Measurements, Recurring | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,209.1 2,657.7
Fair Value, Measurements, Recurring | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 822.4 587.2
Fair Value, Measurements, Recurring | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 10.2 15.7
Fair Value, Measurements, Recurring | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Netting (1,114.9) (1,357.1)
Derivative Asset 1,351.7 1,206.4
Fair Value, Measurements, Recurring | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Asset 2,289.0 2,466.1
Fair Value, Measurements, Recurring | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Asset 177.6 96.1
Fair Value, Measurements, Recurring | Other Assets | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Asset   1.3
Fair Value, Measurements, Recurring | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Netting (1,507.8) (1,796.3)
Derivative Liabilities 718.8 592.1
Fair Value, Measurements, Recurring | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 2,082.5 2,262.5
Fair Value, Measurements, Recurring | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 106.4 93.1
Fair Value, Measurements, Recurring | Other Liabilities | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 37.7 32.8
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 5,653.0 5,185.3
Trading Account 0.0 0.0
Total Available for Sale and Trading Debt Securities 5,653.0 5,185.3
Fair Value, Measurements, Recurring | Level 1 | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 5,653.0 5,185.3
Fair Value, Measurements, Recurring | Level 1 | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Other Assets | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets   0.0
Fair Value, Measurements, Recurring | Level 1 | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Level 1 | Other Liabilities | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 33,267.2 31,703.5
Trading Account 1.3 0.3
Total Available for Sale and Trading Debt Securities 33,268.5 31,703.8
Fair Value, Measurements, Recurring | Level 2 | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 2 | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 1,147.6 655.9
Fair Value, Measurements, Recurring | Level 2 | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 22,620.1 22,424.6
Fair Value, Measurements, Recurring | Level 2 | Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3.3 142.2
Fair Value, Measurements, Recurring | Level 2 | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,585.5 2,294.7
Fair Value, Measurements, Recurring | Level 2 | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 764.2 829.3
Fair Value, Measurements, Recurring | Level 2 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 2,104.8 2,096.2
Fair Value, Measurements, Recurring | Level 2 | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 3,209.1 2,657.7
Fair Value, Measurements, Recurring | Level 2 | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 822.4 587.2
Fair Value, Measurements, Recurring | Level 2 | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 10.2 15.7
Fair Value, Measurements, Recurring | Level 2 | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 2,466.6 2,563.5
Fair Value, Measurements, Recurring | Level 2 | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 2,289.0 2,466.1
Fair Value, Measurements, Recurring | Level 2 | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 177.6 96.1
Fair Value, Measurements, Recurring | Level 2 | Other Assets | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets   1.3
Fair Value, Measurements, Recurring | Level 2 | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 2,188.9 2,355.6
Fair Value, Measurements, Recurring | Level 2 | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 2,082.5 2,262.5
Fair Value, Measurements, Recurring | Level 2 | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 106.4 93.1
Fair Value, Measurements, Recurring | Level 2 | Other Liabilities | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Trading Account 0.0 0.0
Total Available for Sale and Trading Debt Securities 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Obligations of States and Political Subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Government Sponsored Agency    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Non-U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Corporate Debt    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Covered Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Other Asset-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Commercial Mortgage-Backed    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Other    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Available for Sale 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Other Assets    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Other Assets | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Other Assets | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Other Assets | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Assets   0.0
Fair Value, Measurements, Recurring | Level 3 | Other Liabilities    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 37.7 32.8
Fair Value, Measurements, Recurring | Level 3 | Other Liabilities | Foreign Exchange Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Other Liabilities | Interest Rate Contracts    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities 0.0 0.0
Fair Value, Measurements, Recurring | Level 3 | Other Liabilities | Other Financial Derivatives    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]    
Derivative Liabilities $ 37.7 $ 32.8