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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Entity Information [Line Items]                  
Off-Balance Sheet, Credit Loss, Liability $ 3.2 $ 3.5 $ 3.2 $ 3.5 $ 3.4 $ 3.7 $ 2.3   $ 0.0
Provision for (reversal of) credit loss expense (0.2) (4.0)   (52.5)          
Credit Extension Commitments 2,558.6   2,558.6     2,280.0      
Unused Credit Card Lines                  
Entity Information [Line Items]                  
Credit Extension Commitments 682.5   682.5     682.8      
Standby Letter of Credit                  
Entity Information [Line Items]                  
Credit Extension Commitments 59.8   59.8     59.0      
Cumulative effect, period of adoption, adjusted balance                  
Entity Information [Line Items]                  
Off-Balance Sheet, Credit Loss, Liability   2.3   2.3   $ 0.0   $ 0.0  
Provision for (reversal of) credit loss expense $ (0.2) $ 1.2 $ (0.5) $ 1.2