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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Unrealized gains (losses) at beginning of period, net of tax	$ 8.6	$ (25.9)	$ (15.0)
Losses reclassified to net sales	0.9	8.9	14.4
(Decrease) increase in fair value	(20.1)	25.6	(25.3)
Unrealized (losses) gains at end of period, net of taxes	$ (10.6)	$ 8.6	$ (25.9)