Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (34.0)	$ (26.9)
Other comprehensive income (loss), net of tax:
Foreign currency translation (loss) gain	(6.9)	1.6
Cash flow hedges:
Unrealized loss on cash flow hedges arising during the period, net of tax of ($3.0), ($1.0)	(10.1)	(3.1)
Reclassification adjustment for net losses included in net income, net of tax of $0.3, $0.1	1.1	0.2
Defined benefit plans:
Amortization of prior service benefits included in net income, net of tax of ($0.1), ($0.1)	(0.5)	(0.5)
Amortization of net actuarial loss included in net income, net of tax of $1.0, $0.8	3.7	3.0
Total other comprehensive (loss) income	(12.7)	1.2
Total comprehensive loss	$ (46.7)	$ (25.7)