Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 57.6	$ 77.8
Foreign currency translation adjustment	6.5	(7.8)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(0.4)	0.0
Other Comprehensive Income (Loss), Net of Tax	6.1	(7.8)
Comprehensive income (loss)	$ 63.7	$ 70.0