Other Operating Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Components of Other Operating Income [Line Items]
Total Other Operating Income	$ 111.8	$ 68.2	$ 1,097.5	$ 170.2
Pre-tax gain related to the sale of an equity investment	68.1
Loan Service Fees
Components of Other Operating Income [Line Items]
Total Other Operating Income	14.0	21.2	43.4	61.3
Banking Service Fees
Components of Other Operating Income [Line Items]
Total Other Operating Income	14.2	15.0	40.8	40.8
Bank Owned Life Insurance
Components of Other Operating Income [Line Items]
Total Other Operating Income	18.4	17.3	60.4	51.0
Other Income
Components of Other Operating Income [Line Items]
Total Other Operating Income	$ 65.2	$ 14.7	$ 952.9	$ 17.1