Condensed Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 41.7	$ 20.9
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments, net	(8.3)	12.4
Unrealized losses on derivative contracts, net	(3.3)	(0.1)
Amortization of prior service costs and actuarial losses, net	5.7	5.4
Total other comprehensive (loss) income, net of tax	(5.9)	17.7
Comprehensive income	$ 35.8	$ 38.6