Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 17.9	$ 46.9	$ 22.2
Other comprehensive income (loss):
Change in unrecognized pension and postretirement benefit costs	3.1	0.1	1.0
Tax expense on change in unrecognized pension and postretirement benefit costs	0.0	0.0	(0.2)
Foreign currency translation adjustments	(2.1)	(1.8)	2.0
Other comprehensive income (loss)	1.0	(1.7)	2.8
Comprehensive loss attributable to noncontrolling interest	0.0	0.0	0.1
Comprehensive income attributable to controlling interest	$ 18.9	$ 45.2	$ 25.1