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Financial Instruments and Fair Value Measurements - Derivative Instruments and Hedging Activities (Details) (Net investment hedging, USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Euro-denominated net investment in foreign operations
  
Net unrealized gain (loss) recognized in other comprehensive income:  
Hedged item $ 2.7us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
/ us-gaap_DerivativeInstrumentRiskAxis
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4.625% Senior Notes
  
Net unrealized gain (loss) recognized in other comprehensive income:  
Hedging instrument (2.7)us-gaap_TranslationAdjustmentForNetInvestmentHedgeIncreaseDecreaseNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
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Debt and capital lease obligations, net of current portion | Level 3 | 4.625% Senior Notes
  
Derivatives and hedging activities:  
Fair value, hedging instrument $ 531.9us-gaap_NetInvestmentHedgeDerivativeLiabilitiesAtFairValue
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/ us-gaap_DerivativeInstrumentRiskAxis
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