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Other Comprehensive Income (Loss) and Related Tax Effects (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Other comprehensive income, tax (expense) benefit    
Tax effects on foreign currency translation adjustments $ 0us-gaap_OtherComprehensiveIncomeForeignCurrencyTranslationGainLossArisingDuringPeriodTax  
Tax effects on unrealized gains or losses on available-for-sale securities 0us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesTax  
Cumulative foreign currency translation losses $ 90.2us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax $ 63.8us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax