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Financial Instruments - Fair Value and Notional Principal Amounts of Outstanding or Unsettled Derivative Instruments (Details) (Prepaid Expenses and Other Current Assets, Not Designated as Hedging Instrument, Foreign Exchange Contract, USD $)
Mar. 31, 2015
Dec. 31, 2014
Prepaid Expenses and Other Current Assets | Not Designated as Hedging Instrument | Foreign Exchange Contract
    
Derivatives Fair Value [Line Items]    
Fair Value of Derivative, Asset $ 1,000,000us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1],[2]  
Foreign exchange-forward contracts $ 28,000,000invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] $ 20,000,000invest_DerivativeNotionalAmount
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
[1] Derivative contracts address foreign exchange fluctuations for the Euro versus the U.S. Dollar.
[2] We measure the fair value of our outstanding or unsettled derivatives using Level 2 fair value inputs, as we use a pricing model that takes into account the contract terms as well as current foreign currency exchange rates in active markets.