Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income
Balance	$ 1,265.2
Other comprehensive loss	(14.9)	$ 0.7
Balance	1,256.5	1,280.1
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income
Balance	(32.0)	(33.7)
Balance	(46.9)	$ (33.0)
Unrealized Translation
Accumulated Other Comprehensive Income
Balance	(31.5)
Other comprehensive loss	(15.0)
Balance	(46.5)
Cash Flow Hedges
Accumulated Other Comprehensive Income
Balance	0.1
Other comprehensive loss	(0.1)
Balance	0.0
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income
Balance	(0.6)
Other comprehensive loss	0.2
Balance	$ (0.4)