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Investment Securities - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Investments
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Investments
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Investments
Schedule of Held-to-maturity Securities [Line Items]          
Debt Securities, Held-to-maturity, Allowance for Credit Loss $ 0.7   $ 0.7   $ 0.8
Interest Receivable 127.3   127.3   129.1
Debt Securities, Available-for-sale, Realized Gain 0.0 $ 0.0      
Debt Securities, Available-for-sale, Realized Loss 0.0 0.0   $ (23.5)  
Callable structured notes amortized costs 0.0   0.0    
Securities Sold under Agreements to Repurchase, Fair Value of Collateral 3,159.8   3,159.8   3,858.6
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure $ 2,888.0   $ 2,888.0   $ 3,462.2
Investment securities in an unrealized loss position (securities) | Investments 648   648   704
Debt Securities, Current   853.0   853.0  
Investment Securities, Primarily Classified As Available-For-Sale, Callable, Within One Year, Amortized Cost Basis $ 1,514.6   $ 1,514.6    
Investment Securities, Primarily Classified As Available-For-Sale, Callable, Within One Year, Fair Value 1,478.0   1,478.0    
Accrued interest reversal (0.4) $ (1.0) (2.4) $ (1.9)  
Debt Securities          
Schedule of Held-to-maturity Securities [Line Items]          
Interest Receivable $ 33.1   $ 33.1   $ 38.5