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Fair Value Measurements - Derivatives (Details) - Foreign currency forward contracts - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Not Designated as Hedging Instrument      
Derivatives, Fair Value [Line Items]      
Notional amount of foreign currency derivatives $ 0   $ 0
Designated as Hedges | Cash Flow Hedging      
Derivatives, Fair Value [Line Items]      
Notional amount of foreign currency derivatives 352,000,000   346,000,000
Fair value of foreign currency forward contracts 11,000,000   $ 22,000,000
Cash Flow Hedge Gain (Loss) Remaining Maturity within Twelve Months 11,000,000    
Deferred Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 3,000,000    
Ineffective portion relating to these hedges $ 0 $ 0  
Maximum length of time over which our foreign currency forward contracts mature 12 months