Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income/(loss)	$ 27.7	$ (25.5)	$ 127.2
Other comprehensive income:
Change in fair value of interest rate swap, net of tax		(11.9)	(9.9)
Reclassification of interest rate swap, net of tax	21.5	6.9
Pension & other post retirement benefit obligation adjustment, net of tax	3.3	(2.6)	(1.4)
Reclassification adjustment of pension plan, net of tax	0.6	0.4	0.1
Change in fair value of net investment hedge, net of tax		31.2	19.8
Foreign currency translation adjustment	(57.5)	87.0	(26.9)
Total other comprehensive (loss)/income:	(32.1)	111.0	(18.3)
Total comprehensive (loss)/income	$ (4.4)	$ 85.5	$ 108.9