Allowance for Credit Losses (Accrued Interest Reversed Through Income) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable accrued interest income	$ 1.1	$ 2.4
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable accrued interest income	0.5	1.0
Personal
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable accrued interest income	$ 0.6	$ 1.4