Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reserves against accounts receivable
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves
Balance at beginning of period	$ (7.7)	$ (8.2)	$ (10.9)
(Charges) Income	(3.1)	(0.9)	2.1
Deductions from (increase to) reserves and other	2.0	1.4	0.6
Balance at end of period	(8.8)	(7.7)	(8.2)
Valuation allowances against deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves
Balance at beginning of period	(475.2)	(391.7)	(383.3)
(Charges) Income	257.6	(76.1)	(10.9)
Deductions from (increase to) reserves and other	(2.0)	(7.4)	2.4
Balance at end of period	$ (219.6)	$ (475.2)	$ (391.7)