Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income
Balance			$ 1,265.2
Other comprehensive loss	$ 4.9	$ 1.9	(10.0)	$ 2.6
Balance	1,261.6	1,276.9	1,261.6	1,276.9
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income
Balance	(46.9)	(33.0)	(32.0)	(33.7)
Balance	(42.0)	$ (31.1)	(42.0)	$ (31.1)
Unrealized Translation
Accumulated Other Comprehensive Income
Balance			(31.5)
Other comprehensive loss			(10.1)
Balance	(41.6)		(41.6)
Cash Flow Hedges
Accumulated Other Comprehensive Income
Balance			0.1
Other comprehensive loss			(0.1)
Balance	0.0		0.0
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income
Balance			(0.6)
Other comprehensive loss			0.2
Balance	$ (0.4)		$ (0.4)