Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 93.1	$ 28.7	$ 112.2
Changes in cumulative translation adjustment, net of tax of $2.0 million, $3.9 million and $(0.3) million, respectively	(20.2)	23.7	(6.0)
Changes in derivative instruments, net of tax of $0.0 million, $0.0 million and $(0.4) million, respectively	0.0	0.0	(1.5)
Amortization of prior service cost/(credit), net of tax of $(0.1) million, $0.1 million and $0.2 million, respectively	0.2	(0.4)	(0.7)
Amortization of actuarial net losses, net of tax of $(0.4) million, $(0.2) million and $0.0 million, respectively	2.2	1.5	0.0
Actuarial net gains/(losses) arising during the year, net of tax of $(9.0) million, $1.9 million and $(2.2) million, respectively	28.2	(7.7)	9.5
Total comprehensive income	$ 103.5	$ 45.8	$ 113.5