Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 312.6	$ 288.0	$ 236.0
Currency translation and pension and OPEB activity, net of tax	3.9	(23.0)	24.8
Ending balance	349.6	312.6	288.0
Cumulative Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(21.3)	(11.6)	(30.8)
Currency translation and pension and OPEB activity, net of tax	(1.1)	(9.7)	19.2
Ending balance	(22.4)	(21.3)	(11.6)
Pension and Postretirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(19.6)	(6.3)	(11.9)
Currency translation and pension and OPEB activity, net of tax	5.0	(13.3)	5.6
Ending balance	(14.6)	(19.6)	(6.3)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(40.9)	(17.9)	(42.7)
Ending balance	$ (37.0)	$ (40.9)	$ (17.9)