CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 73.7	$ 47.5	$ 69.1
Other comprehensive income (loss):
Foreign currency translation adjustments	3.7	11.5	(20.0)
Reclassification of foreign currency items to other expense (income), net	2.1	0.0	0.0
Unrealized gains and (losses) on hedging instruments:
Gain on settlement	0.0	(3.6)	1.5
Reclassification into net income	(1.5)	0.0	0.0
Income tax benefit (provision) related to hedging instruments	0.3	2.1	(0.4)
Pension and postretirement benefit liability adjustments:
Amortization of net losses and settlement losses included in net periodic pension cost	1.7	1.9	1.9
Pension and postretirement benefit liability adjustments arising during the period	(3.2)	3.3	(5.6)
Income tax benefit (provision) related to pension and postretirement plans	(0.4)	(2.5)	1.0
Total other comprehensive income (loss)	2.7	12.7	(21.6)
Total comprehensive income	$ 76.4	$ 60.2	$ 47.5