Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period	$ 10.4	$ 9.9	$ 12.4
Charge (Benefit) to Expenses	8.4	6.9	9.4
(To) From Other Accounts	0.0	0.0	(2.0)
Deductions	5.8	6.4	9.9
End of Period	13.0	10.4	9.9
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning of Period	45.5	54.4	58.4
Charge (Benefit) to Expenses	13.1	(9.2)	(3.6)
(To) From Other Accounts	(0.4)	0.3	(0.4)
Deductions	0.0	0.0	0.0
End of Period	$ 58.2	$ 45.5	$ 54.4