Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Entity Information [Line Items]
Off-Balance Sheet, Credit Loss, Liability	$ 17.8	$ 6.2	$ 16.2	$ 3.8
Provision for credit loss expense	(12.2)	(57.3)
Credit Extension Commitments	4,976.5		5,173.3
Unused Credit Card Lines
Entity Information [Line Items]
Credit Extension Commitments	819.8		827.6
Standby Letter of Credit
Entity Information [Line Items]
Credit Extension Commitments	83.0		$ 93.8
Cumulative effect, period of adoption, adjusted balance
Entity Information [Line Items]
Provision for credit loss expense	$ 1.6	$ 2.4