Hedging Transaction and Derivative Instruments - Gain (Loss) of Derivative Instruments Recognized on Income Statement (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Document Fiscal Year Focus			2017
Other nonoperating income (expense) | Cash Flow Hedging | Designated as hedging instrument
Derivative [Line Items]
Derivative, gain (loss) on derivative, net	$ 0.3	$ (0.3)	$ 1.7	$ (0.2)
Other nonoperating income (expense) | Economic Hedge | Not designated as hedging instrument
Derivative [Line Items]
Derivative, gain (loss) on derivative, net	$ (0.6)	$ (0.6)	$ (0.9)	$ 0.0