Other Operating Income - (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of Other Operating Income [Line Items]
Total Other Operating Income	$ 191.3	$ 243.9	$ 194.0
Loan Service Fees
Components of Other Operating Income [Line Items]
Total Other Operating Income	71.5	66.6	52.5
Banking Service Fees
Components of Other Operating Income [Line Items]
Total Other Operating Income	49.8	50.9	46.1
Other Income
Components of Other Operating Income [Line Items]
Total Other Operating Income	$ 70.0	$ 126.4	$ 95.4