Other Operating Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Other Income and Expenses [Abstract]
Business Promotion	$ 19.1	$ 22.2	$ 37.0	$ 39.1
Staff Related	12.3	7.0	22.1	11.2
FDIC Insurance Premiums	7.4	9.5	15.2	17.4
Other Expenses	53.5	52.2	107.8	107.2
Total Other Operating Expense	$ 92.3	$ 90.9	$ 182.0	$ 174.9