Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			$ 599.4
Translation adjustments			(27.0)	$ 35.4
Unrealized (losses) gains	$ 0.7	$ 0.0	0.7	0.0
Unrealized loss	0.0	0.0	0.0	(0.1)
Balance at end of period	614.1		614.1
Cumulative Translation Adjustment and Related Hedging Instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(58.6)	(99.8)
Translation adjustments			(27.0)	35.4
Unrealized (losses) gains			(0.7)
Balance at end of period	(86.3)	(64.4)	(86.3)	(64.4)
Pension and Other Post-Retirement Benefits
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			5.2	5.2
Balance at end of period	5.2	5.2	5.2	5.2
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			0.0	0.0
Unrealized (losses) gains			0.7
Balance at end of period	0.7	0.0	0.7	0.0
Other
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			0.0	0.4
Unrealized loss				(0.1)
Balance at end of period	0.0	0.3	0.0	0.3
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(53.4)	(94.2)
Balance at end of period	$ (80.4)	$ (58.9)	$ (80.4)	$ (58.9)