Stockholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Cumulative foreign currency translation adjustments	$ (42.6)	$ (20.7)
Cumulative deferral of hedging net losses, net of tax of $0.6 in 2015	(0.8)	0.0
Cumulative deferral of pension net losses, net of tax of $65.1 in 2015 and $59.6 in 2014	(103.8)	(96.4)
Accumulated other comprehensive loss	(147.2)	(117.1)
Cumulative deferral of hedging net losses, tax	0.6
Cumulative deferral of pension net losses, tax	$ 65.1	$ 59.6