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Financial Instruments and Concentrations of Credit Risk (Details)
In Millions, unless otherwise specified
 12 Months Ended 22 Months Ended
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Dec. 31, 2013
Forward Contracts [Member]
Designated as Hedging Instrument [Member]
USD ($)
Oct. 31, 2013
Forward Contracts [Member]
Designated as Hedging Instrument [Member]
USD ($)
Dec. 31, 2014
Forward Contracts [Member]
Designated as Hedging Instrument [Member]
EUR (€)
Derivatives, Fair Value [Line Items]            
Forward contract to sell foreign currency           € 30us-gaap_DerivativeLiabilityNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
After-tax gain in comprehensive income 0us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0.5us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax (0.2)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax 0.5us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 2.4us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		  
Bad debt expense $ 2.4us-gaap_ProvisionForDoubtfulAccounts $ 0.6us-gaap_ProvisionForDoubtfulAccounts $ 1.0us-gaap_ProvisionForDoubtfulAccounts