Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 27.7	$ 41.0	$ 65.6	$ 87.3
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(10.2)	(2.8)	(7.1)	(24.8)
Less: Reclassification adjustment for realized translation adjustments	(0.3)	(0.2)	(0.7)	(0.6)
Unrealized (losses) gains on derivative instruments	(0.6)	0.4	0.7	0.7
Less: Reclassification adjustment for gains on derivative instruments included in net income	(2.4)	(0.8)	(5.1)	(2.4)
Reclassification adjustment for amortization of postretirement benefit plans' costs included in net periodic benefit cost	0.1	0.8	1.6	2.3
Other comprehensive (loss)	(13.4)	(2.6)	(10.6)	(24.8)
Comprehensive income	$ 14.3	$ 38.4	$ 55.0	$ 62.5