Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (22.0)	$ (3.0)
Other comprehensive income (loss), net of tax:
Foreign currency translation gain	1.8	1.0
Cash flow hedges:
Unrealized gain on cash flow hedges arising during the period, net of tax of $0.2	0.0	0.6
Reclassification adjustment for net losses included in net income, net of tax of $0.5	0.0	1.8
Defined benefit plans:
Amortization of prior service benefits included in net income, net of tax of ($0.1)	0.0	(0.5)
Amortization of net actuarial loss included in net income, net of tax of $1.4	0.0	4.9
Total other comprehensive income	1.8	7.8
Total comprehensive (loss) income	$ (20.2)	$ 4.8