Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 3.1	$ (3.1)
Other comprehensive loss, net of income tax
Unrealized losses on derivatives, net of income tax provision of $0.0 and $0.0, respectively	(0.2)	0.0
Employee pension and postretirement benefit expense, net of income tax provision of $0.0 and $0.0, respectively	(0.6)	(0.6)
Foreign currency translation adjustments, net of income tax benefit of $0.0 and $3.2, respectively	(5.5)	(10.0)
Total other comprehensive loss, net of income tax	(6.3)	(10.6)
Comprehensive income (loss)	$ (3.2)	$ (13.7)