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Fair Value Measurements - Derivatives (Details) - Foreign currency forward contracts - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Not Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Notional amount of foreign currency derivatives $ 0   $ 0   $ 0
Designated as Hedges | Cash Flow Hedging          
Derivatives, Fair Value [Line Items]          
Notional amount of foreign currency derivatives 328,000,000   328,000,000   346,000,000
Fair value of foreign currency forward contracts (10,000,000)   (10,000,000)   $ 22,000,000
Cash flow hedge gain (loss) remaining maturity within fifteen months     (10,000,000)    
Deferred cash flow hedge gain (loss) to be reclassified within twelve months     $ (6,000,000)    
Maximum length of time over which our foreign currency forward contracts mature     15 months    
Ineffective portion relating to these hedges $ 0 $ 0 $ 0 $ 0