Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 39.2	$ (123.6)	$ 11.0
Other comprehensive income (loss), net of income tax:
Unrealized gains (losses) on derivatives,net of income tax provision of $0.0, $0.0 and $0.0, respectively	(4.1)	5.4	0.0
Employee pension and postretirement benefit income (expense), net of income tax (provision) benefitof $0.7, $(1.1) and $(0.4), respectively	5.0	17.0	15.6
Foreign currency translation adjustments, net of income tax (provision) benefit of $0.1, $(0.4) and $5.1, respectively	20.6	(27.9)	(20.5)
Total other comprehensive income (loss), net of income tax	21.5	(5.5)	(4.9)
Comprehensive income (loss)	$ 60.7	$ (129.1)	$ 6.1