Hedging - Narrative (Details) - Foreign currency forward contracts $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Cash flow hedging | Minimum
Derivative [Line Items]
Derivative term	1 month
Cash flow hedging | Maximum
Derivative [Line Items]
Derivative term	18 months
Not designated as hedging instruments
Derivative [Line Items]
Derivative term	1 year
Not designated as hedging instruments | Cash flow hedging
Derivative [Line Items]
Notional amount of foreign currency forward contract	$ 220.9