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Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities Measured on a Recurring Basis (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investments in marketable securities    
Other investments $ 210.0us-gaap_AlternativeInvestmentsFairValueDisclosure $ 214.1us-gaap_AlternativeInvestmentsFairValueDisclosure
Fair Value Measured on a Recurring Basis | Level 1    
Financial Assets    
Cash equivalents 59.1us-gaap_CashAndCashEquivalentsFairValueDisclosure
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39.0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Investments in marketable securities    
Trading securities 22.3us-gaap_TradingSecurities
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[1] 22.5us-gaap_TradingSecurities
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[1]
Available-for-sale securities 150.3us-gaap_AvailableForSaleSecurities
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[1] 135.4us-gaap_AvailableForSaleSecurities
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[1]
Other investments 13.6us-gaap_AlternativeInvestmentsFairValueDisclosure
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14.1us-gaap_AlternativeInvestmentsFairValueDisclosure
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Financial Liabilities    
Contingent payment arrangements 0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
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[2] 0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
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[2]
Obligations to related parties 0us-gaap_RelatedPartyTransactionDueFromToRelatedParty
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0us-gaap_RelatedPartyTransactionDueFromToRelatedParty
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Interest rate swaps 0us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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0us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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Forward currency forward contracts 0us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
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[2]  
Fair Value Measured on a Recurring Basis | Level 2    
Financial Assets    
Cash equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
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0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Investments in marketable securities    
Trading securities 0us-gaap_TradingSecurities
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[1] 0us-gaap_TradingSecurities
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[1]
Available-for-sale securities 0us-gaap_AvailableForSaleSecurities
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[1] 0us-gaap_AvailableForSaleSecurities
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[1]
Other investments 19.4us-gaap_AlternativeInvestmentsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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18.4us-gaap_AlternativeInvestmentsFairValueDisclosure
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Financial Liabilities    
Contingent payment arrangements 0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
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[2] 0us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
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[2]
Obligations to related parties 0us-gaap_RelatedPartyTransactionDueFromToRelatedParty
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Interest rate swaps 1.4us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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2.5us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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Forward currency forward contracts 0.5us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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[2]  
Fair Value Measured on a Recurring Basis | Level 3    
Financial Assets    
Cash equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Investments in marketable securities    
Trading securities 0us-gaap_TradingSecurities
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
[1] 0us-gaap_TradingSecurities
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[1]
Available-for-sale securities 0us-gaap_AvailableForSaleSecurities
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[1] 0us-gaap_AvailableForSaleSecurities
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[1]
Other investments 134.2us-gaap_AlternativeInvestmentsFairValueDisclosure
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131.8us-gaap_AlternativeInvestmentsFairValueDisclosure
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Financial Liabilities    
Contingent payment arrangements 59.3us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
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[2] 50.2us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
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= us-gaap_FairValueInputsLevel3Member
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[2]
Obligations to related parties 93.1us-gaap_RelatedPartyTransactionDueFromToRelatedParty
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76.9us-gaap_RelatedPartyTransactionDueFromToRelatedParty
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Interest rate swaps 0us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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Forward currency forward contracts 0us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
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= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
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[2]  
Fair Value | Fair Value Measured on a Recurring Basis    
Financial Assets    
Cash equivalents 59.1us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
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39.0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
Investments in marketable securities    
Trading securities 22.3us-gaap_TradingSecurities
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
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[1] 22.5us-gaap_TradingSecurities
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
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[1]
Available-for-sale securities 150.3us-gaap_AvailableForSaleSecurities
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
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[1] 135.4us-gaap_AvailableForSaleSecurities
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
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[1]
Other investments 167.2us-gaap_AlternativeInvestmentsFairValueDisclosure
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164.3us-gaap_AlternativeInvestmentsFairValueDisclosure
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Financial Liabilities    
Contingent payment arrangements 59.3us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
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[2] 50.2us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisObligations
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[2]
Obligations to related parties 93.1us-gaap_RelatedPartyTransactionDueFromToRelatedParty
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76.9us-gaap_RelatedPartyTransactionDueFromToRelatedParty
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Interest rate swaps 1.4us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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2.5us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
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Forward currency forward contracts $ 0.5us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
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[2]  
[1] Principally investments in equity securities.
[2] Amounts are presented within Other liabilities in the accompanying Consolidated Balance Sheets.