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Investment Securities - Maturities of Investment Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Dec. 31, 2021
Available-for-Sale, Amortized Cost    
Available-for-Sale Amortized Cost, Within One Year $ 84.8  
Available-for-Sale Amortized Cost, After One Year but Within Five Years 1,566.4  
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years 1,865.4  
Available-for-Sale Amortized Cost, After Ten Years 4,677.2  
Amortized Cost 8,193.8 $ 4,859.3
Available-for-Sale, Estimated Fair Value    
Available-for-Sale Estimated Fair Value, Within One Year 84.4  
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years 1,507.7  
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years 1,738.6  
Available-for-Sale Estimated Fair Value, After Ten Years 4,410.4  
Available-for-Sale, Estimated Fair Value 7,741.1 4,820.5
Held-to-Maturity, Amortized Cost    
Held-to-Maturity Amortized Cost, Within One Year 10.1  
Held-to-Maturity Amortized Cost, After One Year but Within Five Years 375.0  
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years 784.5  
Held-to-Maturity Amortized Cost, After Ten Years 1,962.0  
Amortized Cost 3,131.6 1,687.6
Held-to-Maturity, Estimated Fair Value    
Held-to-Maturity Estimated Fair Value, Within One Year 10.1  
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years 367.9  
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years 718.4  
Held-to-Maturity Estimated Fair Value, After Ten Years 1,764.1  
Held-to-Maturity, Estimated Fair Value 2,860.5 1,667.5
Securities Sold under Agreements to Repurchase [Abstract]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 4,871.3 2,617.8
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure $ 4,526.5 $ 2,610.8