Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 85.8	$ 94.5	$ 34.5
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	1.8	(28.6)	36.0
Less: Reclassification adjustment for realized translation adjustments	(0.9)	(0.8)	0.0
Unrealized gains on derivative instruments	1.6	2.4
Unrealized gains on derivative instruments			2.0
Less: Reclassification adjustment for (gains) losses on derivative instruments included in net income	(4.5)	(3.7)	0.3
Net gain (loss) from postretirement benefit plans	0.6	(3.3)	8.3
Less: Amortization of postretirement benefit plans' costs included in net periodic benefit cost	3.3	3.8	3.3
Other comprehensive income (loss)	1.9	(30.2)	49.9
Comprehensive income	$ 87.7	$ 64.3	$ 84.4