Rollforward of Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total, Balance at beginning of period			$ (42.3)	$ (14.8)
Translation adjustments	$ (9.2)	$ (16.0)	(23.8)	(15.6)
Unrealized loss on available-for-sale securities	(0.4)	0.0	0.0	0.0
Total, Balance at end of period	(66.1)	(30.4)	(66.1)	(30.4)
Cumulative Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total, Balance at beginning of period			(47.7)	(20.2)
Translation adjustments			(23.8)	(15.6)
Total, Balance at end of period	(71.5)	(35.8)	(71.5)	(35.8)
Pension and Other Post-Retirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total, Balance at beginning of period			5.2	5.2
Translation adjustments			0.0	0.0
Total, Balance at end of period	5.2	5.2	5.2	5.2
Unrealized Gain in Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Total, Balance at beginning of period			0.2	0.2
Translation adjustments			0.0	0.0
Total, Balance at end of period	$ 0.2	$ 0.2	$ 0.2	$ 0.2