Other Operating Expense (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Other Income and Expenses [Abstract]
Business Promotion	$ 16.9	$ 16.7
Staff Related	4.2	14.2
FDIC Insurance Premiums	7.9	18.7
Charitable Contributions	1.9	2.0
Other Expenses	53.1	48.8
Total Other Operating Expense	$ 84.0	100.4
FDIC Special Assessment
Loss Contingencies [Line Items]
FDIC special assessment charge		$ 12.5	$ 14.7	$ 84.6