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Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 29, 2014
Operating Loss Carryforwards |  |  |  |  |
Tax credit carryforwards | $ 16.9 us-gaap_TaxCreditCarryforwardAmount | $ 16.9 us-gaap_TaxCreditCarryforwardAmount |  |  |
Carryforwards expiring in 2015 | 3.9 spw_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwardsSubjectToExpirationDuringNext12Months | 3.9 spw_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwardsSubjectToExpirationDuringNext12Months |  |  |
Tax credit carryforwards expiring between 2015 and 2034 | 426.6 spw_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwardsSubjectToExpirationInFutureYears | 426.6 spw_DeferredTaxAssetsOperatingLossAndTaxCreditCarryforwardsSubjectToExpirationInFutureYears |  |  |
Impairment charges |  | 38.1 us-gaap_GoodwillAndIntangibleAssetImpairment | 6.7 us-gaap_GoodwillAndIntangibleAssetImpairment | 285.9 us-gaap_GoodwillAndIntangibleAssetImpairment |
Increase (decrease) in valuation allowance |  | 3.6 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount | 21.2 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |  |
Income taxes | 29.7 us-gaap_IncomeTaxExpenseBenefit | 214.1 us-gaap_IncomeTaxExpenseBenefit | 60.3 us-gaap_IncomeTaxExpenseBenefit | (14.2)us-gaap_IncomeTaxExpenseBenefit |
Foreign withholding taxes on foreign dividends |  | 18.6 spw_ForeignWithholdingTaxesOnDividends |  |  |
Undistributed foreign earnings | 1,265.0 us-gaap_UndistributedEarningsOfForeignSubsidiaries | 1,265.0 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |
Foreign earnings from the service solution sale to be repatriated in future |  | 278.0 spw_ForeignEarningsFromSaleOfBusinessToBeRepatriatedInFuture |  |  |
Foreign earnings portion related to withholding taxes from the service solution sale to be repatriated in future |  |  |  | 100.8 us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation |
Unrecognized Tax Benefits | 63.3 us-gaap_UnrecognizedTaxBenefits | 63.3 us-gaap_UnrecognizedTaxBenefits | 128.4 us-gaap_UnrecognizedTaxBenefits | 108.4 us-gaap_UnrecognizedTaxBenefits |
Net unrecognized tax benefits | 33.9 spw_UnrecognizedTaxBenefitsNet | 33.9 spw_UnrecognizedTaxBenefitsNet | 72.9 spw_UnrecognizedTaxBenefitsNet | 72.5 spw_UnrecognizedTaxBenefitsNet |
Portion of unrecognized benefits which, if recognized, would impact future effective tax rates | 33.3 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate | 33.3 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |  |  |
Gross accrued interest | 5.9 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 5.9 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 12.4 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 12.8 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |
Net accrued interest | 4.9 spw_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccruedNet | 4.9 spw_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccruedNet | 8.6 spw_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccruedNet | 8.6 spw_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccruedNet |
Gross interest income included in income tax (provision) benefit |  | 0.9 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | 0.2 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | 2.9 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense |
Penalties excluded | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued | 7.1 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued | 7.1 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued |
Penalties recorded |  | (7.1)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense | 0 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense | 1.5 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesExpense |
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, low end of range | 10.0 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound | 10.0 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeLowerBound |  |  |
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, high end of range | 15.0 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound | 15.0 us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleEstimatedRangeOfChangeUpperBound |  |  |
Valuation Allowance on Foreign Deferred Tax Assets | 5.1 spw_ValuationAllowanceOnForeignDeferredTaxAssets | 5.1 spw_ValuationAllowanceOnForeignDeferredTaxAssets |  |  |
Aggregate changes in balance of unrecognized tax benefits |  |  |  |  |
Unrecognized tax benefit - opening balance |  | 128.4 us-gaap_UnrecognizedTaxBenefits | 108.4 us-gaap_UnrecognizedTaxBenefits | 120.4 us-gaap_UnrecognizedTaxBenefits | 128.4 us-gaap_UnrecognizedTaxBenefits
Gross increases - tax positions in prior period |  | 3.7 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 0.5 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions | 20.6 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions |
Gross decreases - tax positions in prior period |  | (36.9)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (2.3)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions | (33.9)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions |
Gross increases - tax positions in current period |  | 11.7 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 28.4 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions | 11.2 us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions |
Settlements |  | (28.2)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (1.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities | (7.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities |
Lapse of statute of limitations |  | (14.7)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (5.5)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations | (2.7)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations |
Change due to foreign currency exchange rates |  | (0.7)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation |  | (0.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation |
Unrecognized tax benefit - ending balance | 63.3 us-gaap_UnrecognizedTaxBenefits | 63.3 us-gaap_UnrecognizedTaxBenefits | 128.4 us-gaap_UnrecognizedTaxBenefits | 108.4 us-gaap_UnrecognizedTaxBenefits |
Uncertain Tax Positions and Other Tax Matters |  |  |  |  |
Tax charges related to valuation allowances recorded against foreign deferred income tax assets |  | 19.6 us-gaap_IncomeTaxReconciliationNondeductibleExpenseRestructuringCharges |  |  |
Tax charges on spin-off transactions |  | 5.1 spw_TaxChargesRecordedOnCertainRestructuringActionsRelatedToSpinOffTransactions |  |  |
Income taxes relating to repatriation of earnings | 18.6 spw_IncomeTaxesRelatingToRepatriationOfEarnings | 18.6 spw_IncomeTaxesRelatingToRepatriationOfEarnings |  |  |
Foreign income taxes relating to spin-off | 6.0 spw_ForeignIncomeTaxesRelatingToSpinOff | 6.0 spw_ForeignIncomeTaxesRelatingToSpinOff |  |  |
Income tax charges related to valuation allowances recorded against foreign deferred income tax assets |  |  | (9.5)spw_IncomeTaxExpenseBenefitValuationAllowancesRecordedAgainstDeferredIncomeTaxAssets | 5.4 spw_IncomeTaxExpenseBenefitValuationAllowancesRecordedAgainstDeferredIncomeTaxAssets |
Tax benefit related to audit settlements and statute expirations |  | 28.6 spw_IncomeTaxExpenseBenefitFromAuditSettlementsAndStatuteExpiration | 6.5 spw_IncomeTaxExpenseBenefitFromAuditSettlementsAndStatuteExpiration | 22.3 spw_IncomeTaxExpenseBenefitFromAuditSettlementsAndStatuteExpiration |
Tax benefit related to loss on an investment in a foreign subsidiary |  | 6.4 spw_IncomeTaxExpenseBenefitFromLossOnInvestmentInForeignSubsidiary |  |  |
Tax benefit related to the research and experimentation credit generated in 2012 |  |  | 4.1 spw_IncomeTaxExpenseBenefitRelatedToResearchAndExperimentationCredits |  |
Income tax charges related foreign dividends and undistributed earnings that are no longer considered to be indefinitely reinvested |  |  |  | 15.4 spw_IncomeTaxExpenseBenefitForeignDividendsAndUndistributedForeignEarnings |
Tax expense partially offset with the deconsolidation of dry cooling business in China |  |  |  | 6.1 spw_IncomeTaxExpenseBenefitOnDeconsolidationOfForeignBusinessUnit |
Maximum period for which impact on state income tax returns of any federal changes remains subject to examination by various states |  | 1 year |  |  |
Continuing operations |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Income taxes |  | 36.5 us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentContinuingOperationsMember |  |  |
Discontinued operations |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Income taxes |  |  | (0.5)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |
Foreign earnings portion related to withholding taxes from the service solution sale to be repatriated in future |  |  |  | 91.8 us-gaap_IncomeTaxExpenseBenefitIntraperiodTaxAllocation / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |
Cooling |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Income tax benefit associated with the impairment charges related to cooling |  |  |  | 26.3 spw_IncomeTaxExpenseBenefitImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = spw_CoolingEquipmentAndServicesMember |
Impairment charges |  |  |  | 281.4 us-gaap_GoodwillAndIntangibleAssetImpairment / us-gaap_StatementBusinessSegmentsAxis = spw_CoolingEquipmentAndServicesMember |
EGS Electrical Group, LLC and Subsidiaries ("EGS") |  |  |  |  |
Uncertain Tax Positions and Other Tax Matters |  |  |  |  |
Gain on sale of interest in EGS |  | 491.2 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |  | 491.2 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember
State and Local Jurisdiction |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Tax loss carryforwards | 362.0 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember | 362.0 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember |  |  |
Foreign Jurisdictions |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
Tax loss carryforwards | $ 874.8 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember | $ 874.8 us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Minimum |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
State income tax returns subject to examination for a period |  | 3 years |  |  |
Maximum |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |
State income tax returns subject to examination for a period |  | 5 years |  |  |

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