Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 634.0	$ 583.7	$ 644.3	$ 572.7
Ending balance	686.5	593.0	686.5	593.0
Other comprehensive loss	5.4	(3.5)	(6.5)	4.2
Pension and Other Post-Employment Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(0.8)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(16.0)
Ending balance	(15.2)		(15.2)
Other comprehensive loss			0.8
Unrealized Gains (Loss) on Hedging Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			(1.2)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			1.2
Ending balance	0.0		0.0
Other comprehensive loss	0.0	0.0	(1.2)	0.0
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.0	0.0	(2.1)	0.0
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(94.9)
Ending balance	(101.0)		(101.0)
Other comprehensive loss			(6.1)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(8.2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.2)	(0.3)	(1.7)	(0.9)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(121.6)	(114.7)	(109.7)	(122.4)
Ending balance	(116.2)	(118.2)	(116.2)	(118.2)
Other comprehensive loss	$ 5.4	$ (3.5)	$ (6.5)	$ 4.2