Other Comprehensive Loss - AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	$ 0.1	$ 0.0	$ 0.4	$ 0.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	0.0	0.0	0.0	0.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	0.1	0.0	0.4	0.0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	1.1	(0.4)	0.3	1.4
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	0.2	0.0	(0.1)	(0.1)
Net losses (gains) reclassified into earnings	0.9	(0.4)	0.2	1.3
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance			(100.0)	(132.1)
Other comprehensive (loss) earnings, net of tax	(7.8)	5.3	(12.1)	28.7
Ending balance	(112.1)	(103.4)	(112.1)	(103.4)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance			0.5	(3.2)
Other comprehensive (loss) earnings, net of tax			(2.1)	3.7
Ending balance	(1.6)	0.5	(1.6)	0.5
Employee benefit plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance			(15.3)	(16.6)
Other comprehensive (loss) earnings, net of tax			0.4	0.0
Ending balance	(14.9)	(16.6)	(14.9)	(16.6)
Cumulative foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance			(85.2)	(112.3)
Other comprehensive (loss) earnings, net of tax			(10.4)	25.0
Ending balance	$ (95.6)	$ (87.3)	$ (95.6)	$ (87.3)