Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 22.5	$ 17.4
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(3.5)	0.9
Less: Reclassification adjustment for realized translation adjustments	0.0	(0.2)
Unrealized (losses) gains on derivative instruments	(12.7)	0.4
Less: Reclassification adjustment for gains on derivative instruments included in net income	0.0	(0.9)
Net gain from postretirement benefit plans	0.1	0.0
Reclassification adjustment for amortization of postretirement benefit plans' costs included in net periodic benefit cost	0.4	0.5
Other comprehensive (loss) income	(15.7)	0.7
Comprehensive income	$ 6.8	$ 18.1