Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Held-to-maturity, Allowance for Credit Loss				$ 0.0
Proceeds from Interest Received	$ (0.4)	$ 1.6
Accrued Investment Income Receivable	9.6
Accounts Receivable, Allowance for Credit Loss	129.1	72.4	$ 29.0	73.0	$ 73.0
Off-balance sheet credit liability	2.1	0.0	0.2	0.0
Deferred tax liability, net	(24.4)			(26.7)
Retained Earnings (Accumulated Deficit)	$ 897.6			953.6
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss			0.0
Accounts Receivable, Allowance for Credit Loss			103.0
Off-balance sheet credit liability			2.3
Deferred tax liability, net			(18.5)
Retained Earnings (Accumulated Deficit)			929.5
Cumulative Effect, Period of Adoption, Adjustment [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss			0.0
Accounts Receivable, Allowance for Credit Loss			30.0	$ 30.0
Off-balance sheet credit liability		$ 0.0	2.3
Deferred tax liability, net			(8.2)
Retained Earnings (Accumulated Deficit)			$ (24.1)