Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ 599.4
Translation adjustments	10.6	$ 6.4
Unrecognized gain	0.0	0.1
Balance at end of period	585.1
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(58.6)	(99.8)
Translation adjustments	10.6	6.4
Unrecognized gain		0.0
Balance at end of period	(48.0)	(93.4)
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
Translation adjustments	0.0	0.0
Unrecognized gain		0.0
Balance at end of period	5.2	5.2
Other
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	0.0	0.4
Translation adjustments	0.0	0.0
Unrecognized gain		0.1
Balance at end of period	0.0	0.5
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	$ (42.8)	$ (87.7)