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Derivative Financial Instruments (Details 2) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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FX forward contracts |  |
Fair value of derivative financial instruments |  |
Gross Assets | $ 0.8 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | $ 1.1 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Gross Liabilities | (5.4)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | (0.5)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Net Assets / Liabilities | (4.6)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 0.6 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
FX forward contracts | Counterparty A |  |
Fair value of derivative financial instruments |  |
Gross Assets |  | 0.7 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = spw_CounterpartyAMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Gross Liabilities | (0.1)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = spw_CounterpartyAMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | (0.1)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = spw_CounterpartyAMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Net Assets / Liabilities | (0.1)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_CounterpartyNameAxis = spw_CounterpartyAMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 0.6 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_CounterpartyNameAxis = spw_CounterpartyAMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
FX forward contracts | Counterparty B |  |
Fair value of derivative financial instruments |  |
Gross Assets | 0.3 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = spw_CounterpartyBMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 0.1 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = spw_CounterpartyBMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Gross Liabilities | (3.5)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = spw_CounterpartyBMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | (0.4)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = spw_CounterpartyBMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Net Assets / Liabilities | (3.2)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_CounterpartyNameAxis = spw_CounterpartyBMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | (0.3)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_CounterpartyNameAxis = spw_CounterpartyBMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
FX forward contracts | Aggregate of other counterparties |  |
Fair value of derivative financial instruments |  |
Gross Assets | 0.5 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = spw_OtherCounterpartyMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 0.3 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = spw_OtherCounterpartyMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Gross Liabilities | (1.8)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = spw_OtherCounterpartyMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember |
Net Assets / Liabilities | (1.3)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_CounterpartyNameAxis = spw_OtherCounterpartyMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | 0.3 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_CounterpartyNameAxis = spw_OtherCounterpartyMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember
Derivative contracts designated as hedging instruments | FX forward contracts |  |
Fair value of derivative financial instruments |  |
Net Assets / Liabilities | (0.2)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 0.3 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivative contracts designated as hedging instruments | FX forward contracts | Other current assets |  |
Fair value of derivative financial instruments |  |
Gross Assets |  | 0.3 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivative contracts designated as hedging instruments | FX forward contracts | Accrued expenses |  |
Fair value of derivative financial instruments |  |
Gross Liabilities | (0.1)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Derivative contracts designated as hedging instruments | FX forward contracts | Other long-term liabilities |  |
Fair value of derivative financial instruments |  |
Gross Liabilities | (0.1)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Derivative contracts designated as hedging instruments | Commodity contracts | Counterparty A |  |
Fair value of derivative financial instruments |  |
Gross Assets |  | 0.4 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_CounterpartyNameAxis = spw_CounterpartyAMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Gross Liabilities | (1.4)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_CounterpartyNameAxis = spw_CounterpartyAMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember |
Net Assets / Liabilities | (1.4)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_CounterpartyNameAxis = spw_CounterpartyAMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember | 0.4 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_CounterpartyNameAxis = spw_CounterpartyAMember / us-gaap_DerivativeByNatureAxis = us-gaap_CommodityContractMember / us-gaap_HedgingDesignationAxis = us-gaap_DesignatedAsHedgingInstrumentMember
Derivative contracts not designated as hedging instruments | FX forward contracts |  |
Fair value of derivative financial instruments |  |
Net Assets / Liabilities | (4.4)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0.3 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivative contracts not designated as hedging instruments | FX forward contracts | Other current assets |  |
Fair value of derivative financial instruments |  |
Gross Assets |  | 0.6 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivative contracts not designated as hedging instruments | FX forward contracts | Accrued expenses |  |
Fair value of derivative financial instruments |  |
Gross Liabilities | (4.4)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (0.3)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivative contracts not designated as hedging instruments | FX embedded derivatives |  |
Fair value of derivative financial instruments |  |
Net Assets / Liabilities | 0.7 us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (7.9)us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivative contracts not designated as hedging instruments | FX embedded derivatives | Other current assets |  |
Fair value of derivative financial instruments |  |
Gross Assets | 5.1 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | 0.7 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivative contracts not designated as hedging instruments | FX embedded derivatives | Other assets |  |
Fair value of derivative financial instruments |  |
Gross Assets | 1.2 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherAssetsMember / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember |
Derivative contracts not designated as hedging instruments | FX embedded derivatives | Accrued expenses |  |
Fair value of derivative financial instruments |  |
Gross Liabilities | (4.7)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | (6.5)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_AccruedLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember
Derivative contracts not designated as hedging instruments | FX embedded derivatives | Other long-term liabilities |  |
Fair value of derivative financial instruments |  |
Gross Liabilities | $ (0.9)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember | $ (2.1)us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_DerivativeByNatureAxis = us-gaap_EmbeddedDerivativeFinancialInstrumentsMember / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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