Derivative Financial Instruments - Schedule of Change in Fair Value of Foreign Currency Forward Exchange Contracts Under Hedge Designations (Details) - Designated as Hedging Instrument - Foreign Currency Forward Exchange Contracts - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative [Line Items]
Unrealized (losses) gains at beginning of period, net of tax	$ (3.1)	$ (1.3)	$ 8.6	$ (25.9)
Losses (gains) reclassified to net sales	0.7	0.6	(1.6)	8.9
(Decrease) increase in fair value	(0.3)	7.2	(9.7)	23.5
Unrealized (loss) gain at end of period, net of tax	$ (2.7)	$ 6.5	$ (2.7)	$ 6.5