Other Operating Income (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025
Components of Other Operating Income [Line Items]
Total Other Operating Income	[1]	$ 70.4	$ 60.3
Loan Service Fees
Components of Other Operating Income [Line Items]
Total Other Operating Income		12.0	13.7
Banking Service Fees
Components of Other Operating Income [Line Items]
Total Other Operating Income		13.3	14.3
Bank Owned Life Insurance
Components of Other Operating Income [Line Items]
Total Other Operating Income		19.5	19.3
Treasury Management Fees
Components of Other Operating Income [Line Items]
Total Other Operating Income		10.3	9.6
Other Income
Components of Other Operating Income [Line Items]
Total Other Operating Income		$ 15.3	$ 3.3

[1] Beginning in Q1 2026, Treasury Management Fees are included within Other Operating Income. The prior period has been revised to conform to the current year presentation.