Accumulated Other Comprehensive Income (Loss) - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 572.7	$ 510.4
Total other comprehensive income (loss)	4.7	(3.5)
Ending balance	565.8	500.3
Pension and Other Post-Employment Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(18.7)
Other comprehensive income (loss) before reclassification	0.0
Amounts reclassified from accumulated other comprehensive loss	0.3
Total other comprehensive income (loss)	0.3
Ending balance	(18.4)
Unrealized Gains on Hedging Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2.7
Other comprehensive income (loss) before reclassification	(0.9)
Amounts reclassified from accumulated other comprehensive loss	0.0
Total other comprehensive income (loss)	(0.9)
Ending balance	1.8
Foreign Currency Items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(106.4)
Other comprehensive income (loss) before reclassification	5.3
Amounts reclassified from accumulated other comprehensive loss	0.0
Total other comprehensive income (loss)	5.3
Ending balance	(101.1)
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(122.4)	(98.6)
Other comprehensive income (loss) before reclassification	4.4
Amounts reclassified from accumulated other comprehensive loss	0.3
Total other comprehensive income (loss)	4.7
Ending balance	$ (117.7)	$ (102.1)