Other Operating Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Income and Expenses [Abstract]
Business Promotion	$ 16.7	$ 16.2
Staff Related	14.2	7.8
FDIC Insurance Premiums(1)	18.7	6.2
Charitable Contributions	2.0	3.2
Other Expenses	48.8	52.2
Total Other Operating Expense	100.4	$ 85.6
FDIC, special assessment	$ 12.5