Equity (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			$ (71.3)	$ (42.3)
Translation adjustments	$ (4.1)	$ 3.3	(4.3)	(14.6)
Unrecognized gain on available-for-sale securities	0.0	0.4	0.0	0.4
Balance at end of period	(75.6)	(56.5)	(75.6)	(56.5)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			(76.8)	(47.7)
Translation adjustments			(4.3)	(14.6)
Unrecognized gain on available-for-sale securities				0.0
Balance at end of period	(81.1)	(62.3)	(81.1)	(62.3)
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 on available-for-sale securities				0.0
Balance at end of period	5.2	5.2	5.2	5.2
Unrealized Gain in Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period			0.3	0.2
Translation adjustments			0.0	0.0
Unrecognized gain on available-for-sale securities				0.4
Balance at end of period	$ 0.3	$ 0.6	$ 0.3	$ 0.6