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Investment Securities - Proceeds from Calls and Sales, Realized Gains and Losses and Interest Income Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Proceeds from calls and sales of investment securities      
Proceeds from calls of investment securities $ 8.3 $ 1.7 $ 8.6
Proceeds from sales of investment securities 551.6    
Proceeds from sales of investment securities   0.0 2.5
Gross realized gains and losses on investment securities      
Gross realized gains on sales of investment securities 40.8    
Gross realized gains on sales of investment securities   0.0 0.1
Gross realized losses on sales of investment securities 40.0    
Gross realized losses on sales of investment securities   0.0 0.0
Income tax expense related to net realized gains on sale of investment securities 0.2 0.0 0.0
Interest income from taxable and nontaxable investment securities      
Interest income from taxable investment securities 134.5 128.7 93.3
Interest income from non-taxable investment securities $ 13.2 $ 13.8 $ 8.1