Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (22.9)	$ 82.8	$ 72.9	$ 161.0
Other comprehensive (loss) income:
Foreign currency translation adjustment, net of income taxes of $2.3 and $(2.4) for the three months ended June 30, 2016 and 2015, respectively, and $1.5 and $(4.3) for the six months ended June 30, 2016 and 2015, respectively	(15.8)	10.5	4.2	(44.4)
Unrealized (loss) gain on derivatives, net of income taxes of $(0.1) and $(0.3) for the three months ended June 30, 2016 and 2015, respectively, and $(0.3) and $0.3 for the six months ended June 30, 2016 and 2015, respectively	(1.5)	(0.7)	(7.1)	4.5
Unrealized loss on available-for-sale investments, net of income taxes of $0.1 and $(0.2) for the six months ended June 30, 2016 and 2015, respectively			(0.1)	(0.3)
Total other comprehensive (loss) income	(17.3)	9.8	(3.0)	(40.2)
Total comprehensive (loss) income	$ (40.2)	$ 92.6	$ 69.9	$ 120.8