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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative [Line Items]
Unrealized gains (losses) at beginning of period, net of tax	$ 13.4	$ (18.3)	$ 8.6	$ (25.9)
(Gains) Losses reclassified to net sales	(0.7)	3.3	(2.3)	8.3
(Decrease) Increase in fair value	(15.8)	13.7	(9.4)	16.3
Unrealized losses at end of period, net of tax	$ (3.1)	$ (1.3)	$ (3.1)	$ (1.3)