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Investment Securities - Maturities of Investment Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Available-for-Sale, Amortized Cost    
Available-for-Sale Amortized Cost, Within One Year $ 625.0  
Available-for-Sale Amortized Cost, After One Year but Within Five Years 1,514.8  
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years 1,295.3  
Available-for-Sale Amortized Cost, After Ten Years 973.7  
Amortized Cost 4,408.8 $ 3,932.7
Available-for-Sale, Estimated Fair Value    
Available-for-Sale Estimated Fair Value, Within One Year 722.7  
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years 1,621.1  
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years 1,161.6  
Available-for-Sale Estimated Fair Value, After Ten Years 898.2  
Available-for-Sale, Estimated Fair Value 4,403.6 4,008.7
Held-to-Maturity, Amortized Cost    
Held-to-Maturity Amortized Cost, Within One Year 662.2  
Held-to-Maturity Amortized Cost, After One Year but Within Five Years 365.7  
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years 263.6  
Held-to-Maturity Amortized Cost, After Ten Years 326.6  
Amortized Cost 1,618.1 51.6
Held-to-Maturity, Estimated Fair Value    
Held-to-Maturity Estimated Fair Value, Within One Year 667.4  
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years 369.7  
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years 266.8  
Held-to-Maturity Estimated Fair Value, After Ten Years 328.6  
Held-to-Maturity, Estimated Fair Value 1,632.5 55.0
Securities Sold under Agreements to Repurchase [Abstract]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 2,373.4 2,323.0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure $ 2,399.1 $ 2,383.6