Other Operating Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income and Expenses [Abstract]
Business Promotion	$ 8.9	$ 7.9	$ 16.8	$ 26.7
Staff Related	9.8	12.2	16.6	8.7
FDIC Insurance Premiums	4.1	2.9	7.7	5.4
Other Intangibles Amortization	3.9	4.2	8.2	8.3
Other Expenses	40.8	58.6	89.9	98.5
Total Other Operating Expense	$ 67.5	$ 85.8	$ 139.2	$ 147.6