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Quarterly Results (Unaudited) (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended |  |
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Dec. 31, 2014 | Dec. 31, 2014 | Sep. 27, 2014 | Jun. 28, 2014 | Mar. 29, 2014 | Dec. 31, 2013 | Sep. 28, 2013 | Jun. 29, 2013 | Mar. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 07, 2014 | Feb. 11, 2014 | Dec. 31, 2007
Quarterly Results (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ 1,277,700,000 us-gaap_SalesRevenueNet | $ 1,171,200,000 us-gaap_SalesRevenueNet | $ 1,195,100,000 us-gaap_SalesRevenueNet | $ 1,077,100,000 us-gaap_SalesRevenueNet | $ 1,328,900,000 us-gaap_SalesRevenueNet | $ 1,162,700,000 us-gaap_SalesRevenueNet | $ 1,180,900,000 us-gaap_SalesRevenueNet | $ 1,100,800,000 us-gaap_SalesRevenueNet | $ 4,721,100,000 us-gaap_SalesRevenueNet | $ 4,773,300,000 us-gaap_SalesRevenueNet | $ 4,894,600,000 us-gaap_SalesRevenueNet |  |  |
Gross profit |  | 367,500,000 us-gaap_GrossProfit | 347,400,000 us-gaap_GrossProfit | 347,200,000 us-gaap_GrossProfit | 301,500,000 us-gaap_GrossProfit | 401,200,000 us-gaap_GrossProfit | 344,000,000 us-gaap_GrossProfit | 338,500,000 us-gaap_GrossProfit | 297,300,000 us-gaap_GrossProfit |  |  |  |  |  |
Income (loss) from continuing operations, net of tax |  | (40,000,000)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 66,700,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 56,700,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 296,700,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 85,100,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 66,600,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 43,500,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 16,100,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 380,100,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 211,300,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (165,200,000)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |  |  |
Income (loss) from discontinued operations, net of tax |  | (3,200,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (2,900,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (6,700,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 21,100,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1,800,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1,900,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 3,700,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | (6,100,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 8,300,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 1,300,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 348,400,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  |  |
Net income |  | (43,200,000)us-gaap_ProfitLoss | 63,800,000 us-gaap_ProfitLoss | 50,000,000 us-gaap_ProfitLoss | 317,800,000 us-gaap_ProfitLoss | 86,900,000 us-gaap_ProfitLoss | 68,500,000 us-gaap_ProfitLoss | 47,200,000 us-gaap_ProfitLoss | 10,000,000 us-gaap_ProfitLoss | 388,400,000 us-gaap_ProfitLoss | 212,600,000 us-gaap_ProfitLoss | 183,200,000 us-gaap_ProfitLoss |  |  |
Less: Net income (loss) attributable to noncontrolling interests |  | (8,200,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 300,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (1,200,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (400,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (100,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (800,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 2,000,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 1,300,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | (9,500,000)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 2,400,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest | 2,800,000 us-gaap_NetIncomeLossAttributableToNoncontrollingInterest |  |  |
Net income attributable to SPX Corporation common shareholders |  | (35,000,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 63,500,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 51,200,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 318,200,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 87,000,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 69,300,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 45,200,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 8,700,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 397,900,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 210,200,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 180,400,000 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |  |
Basic income (loss) per share of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  | $ (0.78)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.59 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.34 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 6.72 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.90 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.51 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.91 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 0.32 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 9.19 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 4.61 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (3.36)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |  |  |
Discontinued operations, net of tax (in dollars per share) |  | $ (0.08)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.07)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.15)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.47 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.04 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.04 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.08 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ (0.13)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.19 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 6.97 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |  |  |
Net income per share attributable to SPX Corporation common shareholders (in dollars per share) |  | $ (0.86)us-gaap_EarningsPerShareBasic | $ 1.52 us-gaap_EarningsPerShareBasic | $ 1.19 us-gaap_EarningsPerShareBasic | $ 7.19 us-gaap_EarningsPerShareBasic | $ 1.94 us-gaap_EarningsPerShareBasic | $ 1.55 us-gaap_EarningsPerShareBasic | $ 0.99 us-gaap_EarningsPerShareBasic | $ 0.19 us-gaap_EarningsPerShareBasic | $ 9.38 us-gaap_EarningsPerShareBasic | $ 4.63 us-gaap_EarningsPerShareBasic | $ 3.61 us-gaap_EarningsPerShareBasic |  |  |
Diluted income (loss) per share of common stock: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations (in dollars per share) |  | $ (0.78)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.57 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.32 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 6.59 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.87 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.50 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.90 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 0.32 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 9.05 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 4.55 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (3.36)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |  |  |
Discontinued operations, net of tax (in dollars per share) |  | $ (0.08)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.07)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.15)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.47 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.04 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.04 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.08 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ (0.14)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.20 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.02 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 6.97 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |  |  |
Net income per share attributable to SPX Corporation common shareholders (in dollars per share) |  | $ (0.86)us-gaap_EarningsPerShareDiluted | $ 1.50 us-gaap_EarningsPerShareDiluted | $ 1.17 us-gaap_EarningsPerShareDiluted | $ 7.06 us-gaap_EarningsPerShareDiluted | $ 1.91 us-gaap_EarningsPerShareDiluted | $ 1.54 us-gaap_EarningsPerShareDiluted | $ 0.98 us-gaap_EarningsPerShareDiluted | $ 0.18 us-gaap_EarningsPerShareDiluted | $ 9.25 us-gaap_EarningsPerShareDiluted | $ 4.57 us-gaap_EarningsPerShareDiluted | $ 3.61 us-gaap_EarningsPerShareDiluted |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  | (32,500,000)us-gaap_GainsLossesOnExtinguishmentOfDebt |  |  |  |  |
Pension liability adjustment, tax (provision) benefit |  |  |  |  |  |  |  |  |  | (5,200,000)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | 1,000,000 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | 800,000 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax |  |  |
Income taxes | 29,700,000 us-gaap_IncomeTaxExpenseBenefit |  |  |  |  |  |  |  |  | 214,100,000 us-gaap_IncomeTaxExpenseBenefit | 60,300,000 us-gaap_IncomeTaxExpenseBenefit | (14,200,000)us-gaap_IncomeTaxExpenseBenefit |  |  |
Income taxes on repatriation of earnings | 18,600,000 spw_IncomeTaxesRelatingToRepatriationOfEarnings |  |  |  |  |  |  |  |  | 18,600,000 spw_IncomeTaxesRelatingToRepatriationOfEarnings |  |  |  |  |
Foreign income taxes on restructuring | 6,000,000 spw_ForeignIncomeTaxesRelatingToSpinOff |  |  |  |  |  |  |  |  | 6,000,000 spw_ForeignIncomeTaxesRelatingToSpinOff |  |  |  |  |
Valuation allowance on foreign deferred income tax assets | 5,100,000 spw_ValuationAllowanceOnForeignDeferredTaxAssets | 5,100,000 spw_ValuationAllowanceOnForeignDeferredTaxAssets |  |  |  |  |  |  |  | 5,100,000 spw_ValuationAllowanceOnForeignDeferredTaxAssets |  |  |  |  |
Deferred tax liabilities reduction due to audit settlements and statute expirations | 18,300,000 spw_DeferredTaxLiabilitiesReduction |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, exclusive of cash transferred |  |  |  |  |  |  |  |  |  | 108,600,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested | 13,500,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested | 1,133,400,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested |  |  |
Gain (loss) on sale of business, net of tax |  |  |  |  |  |  |  |  |  | 13,300,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | (4,000,000)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 313,400,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |
Number of days in the quarter |  |  | 91 days | 91 days |  |  | 91 days | 91 days |  |  |  |  |  |  |
South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 137,300,000 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_ZA | 266,300,000 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_ZA | 322,400,000 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_ZA |  |  |
7.625% senior notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  | 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = spw_SeniorNotes7.625PercentMember | 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = spw_SeniorNotes7.625PercentMember |  |  |  |  | 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = spw_SeniorNotes7.625PercentMember |  |  | 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = spw_SeniorNotes7.625PercentMember | 7.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = spw_SeniorNotes7.625PercentMember
Loss on early extinguishment of debt |  |  |  |  | (32,500,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = spw_SeniorNotes7.625PercentMember |  |  |  |  |  |  |  |  |  |
EGS Electrical Group, LLC and Subsidiaries ("EGS") |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of interest held in joint venture |  |  |  |  | 44.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 44.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |  |  |  | 44.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  | 44.50%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |
Proceeds from sale of interest in joint venture |  |  |  |  | 574,100,000 us-gaap_EquityMethodInvestmentNetSalesProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |  |  |  |  |  |  | 574,100,000 us-gaap_EquityMethodInvestmentNetSalesProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |
Gain on sale of interest in joint venture |  |  |  |  | 491,200,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |  |  |  | 491,200,000 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |  |  |  |
Discontinued operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  |  |  |  |  |  |  |  | (500,000)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementOperatingActivitiesSegmentAxis = us-gaap_SegmentDiscontinuedOperationsMember |  |  |  |
TPS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration, exclusive of cash transferred |  |  |  |  | 42,500,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember |  |  |  |  | 42,500,000 us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember |  |  |  |  |
Gain (loss) on sale of business, net of tax |  | 200,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember | 200,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember | 200,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember | 21,500,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember |  |  |  |  | 21,700,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = spw_ThermalProductSolutionsMember |  |  |  |  |
Flow Technology Reportable Segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 2,596,100,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = spw_FlowTechnologyMember | 2,638,000,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = spw_FlowTechnologyMember | 2,682,200,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = spw_FlowTechnologyMember |  |  |
Flow Technology Reportable Segment | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  | 11,700,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = spw_FlowTechnologyMember |  |  |  | 4,700,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = spw_FlowTechnologyMember |  |  |  |  | 6,700,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = spw_FlowTechnologyMember |  |  |  |
Flow Technology and Thermal Equipment and Services | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  | 20,100,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = spw_FlowTechnologyAndThermalEquipmentAndServicesMember |  |  |  |  |  |  |  | 20,100,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = spw_FlowTechnologyAndThermalEquipmentAndServicesMember | 6,700,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = spw_FlowTechnologyAndThermalEquipmentAndServicesMember |  |  |  |
Thermal Equipment and Services reportable segment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Results (Unaudited) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  | 1,329,900,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember | 1,344,200,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember | 1,490,900,000 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember |  |  |
Thermal Equipment and Services reportable segment | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of power projects |  |  |  |  |  |  |  |  |  | 2 spw_NumberOfPowerProjects / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_StatementGeographicalAxis = country_ZA |  |  |  |  |
Reduction in revenue and segment income |  | 25,000,000 spw_ReductionInRevenueAndSegmentIncomeResultingFromBusinessEnvironmentConditionChanges / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_StatementGeographicalAxis = country_ZA |  | 8,300,000 spw_ReductionInRevenueAndSegmentIncomeResultingFromBusinessEnvironmentConditionChanges / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_StatementGeographicalAxis = country_ZA |  |  |  |  |  | 33,300,000 spw_ReductionInRevenueAndSegmentIncomeResultingFromBusinessEnvironmentConditionChanges / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember / us-gaap_StatementGeographicalAxis = country_ZA |  |  |  |  |
Thermal Equipment and Services reportable segment | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  | 8,400,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember |  |  |  |  |  |  |  |  |  | 4,500,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TrademarksMember / us-gaap_StatementBusinessSegmentsAxis = spw_ThermalEquipmentAndServicesMember |  |  |
Cooling |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges |  | 18,000,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = spw_CoolingEquipmentAndServicesMember |  |  |  |  |  |  |  | 18,000,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = spw_CoolingEquipmentAndServicesMember |  | 11,000,000 us-gaap_ImpairmentOfIntangibleAssetsExcludingGoodwill / us-gaap_StatementBusinessSegmentsAxis = spw_CoolingEquipmentAndServicesMember |  |  |
Pension and postretirement benefit plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Information Related to Quarterly Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-tax loss related to settlement charge |  |  |  |  | 15,300,000 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = spw_PensionPlansAndPostretirementBenefitPlansDefinedBenefitMember |  |  |  |  |  |  |  |  |  |
Gains (losses) related to changes in the fair value of plan assets and actuarial gains (losses) | (86,300,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = spw_PensionPlansAndPostretirementBenefitPlansDefinedBenefitMember | (86,300,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = spw_PensionPlansAndPostretirementBenefitPlansDefinedBenefitMember |  |  |  | 800,000 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = spw_PensionPlansAndPostretirementBenefitPlansDefinedBenefitMember |  |  |  | (86,300,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = spw_PensionPlansAndPostretirementBenefitPlansDefinedBenefitMember | 800,000 us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesAfterTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = spw_PensionPlansAndPostretirementBenefitPlansDefinedBenefitMember |  |  |  |
Pension liability adjustment, tax (provision) benefit |  | $ 27,200,000 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = spw_PensionPlansAndPostretirementBenefitPlansDefinedBenefitMember |  |  |  | $ (1,700,000)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = spw_PensionPlansAndPostretirementBenefitPlansDefinedBenefitMember |  |  |  |  |  |  |  |  |

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