Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (7.8)	$ (26.7)
Other comprehensive income (loss), net of income tax
Unrealized income on derivatives, net of income tax provision of $0.0 and $0.0, respectively	0.0	0.1
Employee pension and postretirement benefits, net of income tax provision of $0.3 and $0.0, respectively	1.2	0.5
Foreign currency translation adjustments	(13.6)	(2.5)
Total other comprehensive loss, net of income tax	(12.4)	(1.9)
Comprehensive loss	$ (20.2)	$ (28.6)