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Investment Securities - Maturities of Investment Securities (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Available-for-Sale, Amortized Cost    
Available-for-Sale Amortized Cost, Within One Year $ 106.2  
Available-for-Sale Amortized Cost, After One Year but Within Five Years 1,233.5  
Available-for-Sale Amortized Cost, After Five Years but Within Ten Years 989.6  
Available-for-Sale Amortized Cost, After Ten Years 2,830.3  
Amortized Cost 5,159.6 $ 5,474.8
Available-for-Sale, Estimated Fair Value    
Available-for-Sale Estimated Fair Value, Within One Year 105.3  
Available-for-Sale Estimated Fair Value, After One Year but Within Five Years 1,187.1  
Available-for-Sale Estimated Fair Value, After Five Years but Within Ten Years 919.8  
Available-for-Sale Estimated Fair Value, After Ten Years 2,683.3  
Estimated Fair Value 4,895.5 5,057.1
Held-to-Maturity, Amortized Cost    
Held-to-Maturity Amortized Cost, Within One Year 8.3  
Held-to-Maturity Amortized Cost, After One Year but Within Five Years 573.6  
Held-to-Maturity Amortized Cost, After Five Years but Within Ten Years 327.9  
Held-to-Maturity Amortized Cost, After Ten Years 1,501.2  
Amortized Cost(1) 2,411.0 2,688.4
Held-to-Maturity, Estimated Fair Value    
Held-to-Maturity Estimated Fair Value, Within One Year 8.4  
Held-to-Maturity Estimated Fair Value, After One Year but Within Five Years 547.4  
Held-to-Maturity Estimated Fair Value, After Five Years but Within Ten Years 297.3  
Held-to-Maturity Estimated Fair Value, After Ten Years 1,332.3  
Investment debt securities held-to-maturity 2,185.4 2,358.6
Securities Sold under Agreements to Repurchase [Abstract]    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 2,877.5 3,460.2
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure 2,664.0 $ 3,092.6
Investment Securities, Primarily Classified As Available-For-Sale, Callable, Within One Year, Fair Value 654.1  
Investment Securities, Primarily Classified As Available-For-Sale, Callable, Within One Year, Amortized Cost Basis $ 682.2