Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	$ 434.9
Total other comprehensive income, net of tax	18.8	$ 10.5
Balance	431.0
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(157.9)	(109.1)
Other comprehensive income (loss) before reclassifications	18.6	10.4
Amounts reclassified from accumulated other comprehensive income (loss)	0.2	0.1
Total other comprehensive income, net of tax	18.8	10.5
Balance	(139.1)	(98.6)
Foreign Currency Translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(150.0)	(104.5)
Other comprehensive income (loss) before reclassifications	18.8	10.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0
Total other comprehensive income, net of tax	18.8	10.0
Balance	(131.2)	(94.5)
Unrecognized Post- Retirement Plan Losses [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(7.3)	(4.6)
Other comprehensive income (loss) before reclassifications	(0.3)	(0.1)
Amounts reclassified from accumulated other comprehensive income (loss)	0.2	0.0
Total other comprehensive income, net of tax	(0.1)	(0.1)
Balance	(7.4)	(4.7)
Derivative Financial Instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance	(0.6)	0.0
Other comprehensive income (loss) before reclassifications	0.1	0.5
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.1
Total other comprehensive income, net of tax	0.1	0.6
Balance	$ (0.5)	$ 0.6