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Derivative and Hedging Activities (Details 1) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair value of outstanding derivatives    
Derivative Fair Value Of Derivative Liability $ 1.1us-gaap_DerivativeFairValueOfDerivativeLiability $ 1.4us-gaap_DerivativeFairValueOfDerivativeLiability
Designated as Hedging Instrument [Member]    
Fair value of outstanding derivatives    
Derivative Fair Value Of Derivative Liability 1.1us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 1.4us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Interest rate swaps [Member] | Other Liability Derivatives Current [Member] | Designated as Hedging Instrument [Member]    
Fair value of outstanding derivatives    
Derivative Fair Value Of Derivative Liability $ 1.1us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= spr_OtherLiabilityDerivativesCurrentMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember		 $ 1.4us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= spr_OtherLiabilityDerivativesCurrentMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember