Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance		$ 516.4	$ 654.1	$ 541.1
Net current-period other comprehensive (loss) income	$ (12.5)	10.8	(15.5)	(17.9)
Ending balance	666.7	$ 629.6	666.7	$ 629.6
Accumulated other Comprehensive Loss
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(113.5)		(110.5)
Ending balance	(126.0)		(126.0)
Currency Translation Adjustments
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(110.5)		(107.4)
Net current-period other comprehensive (loss) income	(12.6)		(15.7)
Ending balance	(123.1)		(123.1)
Pension Plans
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	(3.0)		(3.1)
Net current-period other comprehensive (loss) income	0.0		0.1
Ending balance	(3.0)		(3.0)
Hedging Activities
Changes in accumulated other comprehensive income (loss), net of tax
Beginning balance	0.0		0.0
Net current-period other comprehensive (loss) income	0.1		0.1
Ending balance	$ 0.1		$ 0.1