Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income (loss)	$ 52.7	$ 17.5	$ 60.2	$ (21.4)
Other comprehensive income, net of tax:
Foreign currency translation adjustments, net	9.8	4.6	31.7	9.3
Unrealized gains (losses) on derivative contracts, net	1.3	2.6	(4.4)	3.8
Pension and postretirement liability adjustments, net	0.0	3.1	0.0	3.1
Amortization of prior service costs and actuarial losses, net	4.3	2.3	12.7	9.6
Total other comprehensive income, net of tax	15.4	12.6	40.0	25.8
Comprehensive income	$ 68.1	$ 30.1	$ 100.2	$ 4.4