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3. Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ 27.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue $ 20.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 585.9us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueMeasurementsRecurringMember		 [1] 570.9us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [1]
Forward foreign exchange contracts, Asset 0.6us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember		 [2] 0.6us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember		 [2]
Financial Assets Carried at Fair Value 609.2us-gaap_AssetsFairValueDisclosure
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 592.0us-gaap_AssetsFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember
Forward foreign exchange contracts, Liability 1.7us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
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/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [3]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 27.7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		 [4] 20.8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
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Liabilities, Fair Value Disclosure 29.4us-gaap_LiabilitiesFairValueDisclosure
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= us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 139.9us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember		 [1]
Fair Value, Measurements, Recurring [Member] | Foreign Brokered Certificates of Deposit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 5.2us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CertificatesOfDepositMember		 [1]
Fair Value, Measurements, Recurring [Member] | US Government Sponsored Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 47.5us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Fair Value, Measurements, Recurring [Member] | Foreign Government Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 4.0us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember		 [1]
Fair Value, Measurements, Recurring [Member] | Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 6.5us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_MunicipalBondsMember		 [1]
Fair Value, Measurements, Recurring [Member] | Marketable Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 334.4us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Fair Value, Measurements, Recurring [Member] | Asset-backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 48.4us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Fair Value, Measurements, Recurring [Member] | Foreign Time Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 16.5us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | US Government Sponsored Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents   1.2us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 2.2us-gaap_CashAndCashEquivalentsFairValueDisclosure
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= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
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Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 4.0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
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Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 22.7us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashEquivalentsMember
/ us-gaap_FairValueByMeasurementFrequencyAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 334.4us-gaap_AvailableForSaleSecurities
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Forward foreign exchange contracts, Asset 0us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
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Financial Assets Carried at Fair Value 353.1us-gaap_AssetsFairValueDisclosure
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Forward foreign exchange contracts, Liability 0us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
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Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
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Liabilities, Fair Value Disclosure 0us-gaap_LiabilitiesFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Brokered Certificates of Deposit [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0us-gaap_AvailableForSaleSecurities
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/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Government Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Municipal Obligations [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Marketable Equity Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 334.4us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale investments 0us-gaap_AvailableForSaleSecurities
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Time Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 16.5us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | US Government Sponsored Agencies [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents   0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 2.2us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 18.7us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | US Government Sponsored Agencies [Member]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Time Deposits [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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[1] Available-for-sale investments are included in the following accounts in the Consolidated Balance Sheets (in millions): December 31, 2014 December 31, 2013 Short-term investments$284.4 $277.4Other investments301.5 293.5Total$585.9 $570.9
[2] Forward foreign exchange contracts in an asset position are included in Other current assets in the Consolidated Balance Sheets.
[3] Forward foreign exchange contracts in a liability position are included in Other current liabilities in the Consolidated Balance Sheets.
[4] Contingent consideration liabilities are included in the following accounts in the Consolidated Balance Sheets (in millions): December 31, 2014 December 31, 2013 Other current liabilities$13.1 $6.1Other long-term liabilities14.6 14.7 Total$27.7 $20.8
[5] Cash equivalents are included in Cash and cash equivalents in the Consolidated Balance Sheets.