Other Operating Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income and Expenses [Abstract]
Business Promotion	$ 7.9	$ 18.8
Staff Related	6.8	(3.5)
FDIC Insurance Premiums	3.6	2.5
Other Intangibles Amortization	4.3	4.1
Other Expenses	49.1	39.9
Total Other Operating Expense	$ 71.7	$ 61.8