Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reserves against accounts receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ (8.2)	$ (10.9)	$ (6.1)
(Charges) Income	(0.9)	2.1	(2.9)
Deductions from reserves and other	1.4	0.6	(1.9)
Balance at end of period	(7.7)	(8.2)	(10.9)
Valuation allowances against deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	(391.7)	(383.3)	(303.8)
(Charges) Income	(76.1)	(10.9)	(68.4)
Deductions from reserves and other	(7.4)	2.4	(11.0)
Balance at end of period	$ (475.2)	$ (391.7)	$ (383.3)