Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 1,256.5
Other comprehensive loss	$ (3.6)	$ 4.9	(5.5)	$ (5.1)
Ending balance	1,261.9	1,289.9	1,261.9	1,289.9
Unrealized Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(27.7)
Other comprehensive loss			(5.6)
Ending balance	(33.3)		(33.3)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			0.0
Other comprehensive loss			0.0
Ending balance	0.0		0.0
Defined Benefit Pension Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(0.4)
Other comprehensive loss			0.1
Ending balance	(0.3)		(0.3)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(30.0)	(42.0)	(28.1)	(32.0)
Other comprehensive loss			(5.5)
Ending balance	$ (33.6)	$ (37.1)	$ (33.6)	$ (37.1)