Equity - Reconciliations for the Changes in 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]
Beginning balance	$ (43.5)
Total other comprehensive income, net of tax	6.8	$ 9.2
Ending balance	(26.3)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(9.8)	(7.9)
Other comprehensive income (loss) before reclassifications	7.0	17.2
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0
Total other comprehensive income, net of tax	7.0	17.2
Ending balance	(2.8)	9.3
Gains and Losses on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0.8	(1.8)
Other comprehensive income (loss) before reclassifications	(0.4)	0.3
Amounts reclassified from accumulated other comprehensive income (loss)	(0.2)	0.6
Total other comprehensive income, net of tax	(0.6)	0.9
Ending balance	0.2	(0.9)
Pension & Postretirement
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(34.4)	(34.8)
Other comprehensive income (loss) before reclassifications	0.0	(9.4)
Amounts reclassified from accumulated other comprehensive income (loss)	0.4	0.5
Total other comprehensive income, net of tax	0.4	(8.9)
Ending balance	(34.0)	(43.7)
Accumulated Other Comprehensive (Loss) Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(43.4)	(44.5)
Other comprehensive income (loss) before reclassifications	6.6	8.1
Amounts reclassified from accumulated other comprehensive income (loss)	0.2	1.1
Total other comprehensive income, net of tax	6.8	9.2
Ending balance	$ (36.6)	$ (35.3)