Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (69.9)	$ (22.0)
Other comprehensive (loss) income, net of tax:
Foreign currency translation gain	0.0	1.8
Defined benefit plans:
Amortization of prior service benefits included in net income, net of tax of ($0.1)	(0.1)	0.0
Amortization of net actuarial gain included in net income, net of tax of ($0.2)	(0.8)	0.0
Total other comprehensive (loss) income	(0.9)	1.8
Total comprehensive loss	$ (70.8)	$ (20.2)