Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ (430.9)	$ 440.0	$ 7.9
Other comprehensive income (loss), net of tax:
Cumulative translation adjustments (net of tax of $3.9, $0.0, and $0.0)	(36.9)	(5.3)	(2.3)
Net gain (loss) on cash flow hedges (net of tax (benefit) of $(3.1), $0.0, and $0.0)	(9.8)	5.9	(5.8)
Pension and other postretirement benefit plans:
Prior service credit arising during period (net of tax of $0.0, $0.3, and $0.0)	0.1	2.2
Net gain (loss) arising during period (net of tax (benefit) of $23.7, $8.9, and $(7.3))	64.9	26.2	(18.3)
Amounts reclassified from accumulated other comprehensive income	(2.4)	9.9	2.7
Total other comprehensive income (loss), net of tax	15.9	38.9	(23.7)
Comprehensive income (loss)	$ (415.0)	$ 478.9	$ (15.8)