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Investments in Joint Ventures (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 07, 2014 | Mar. 29, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 07, 2014
Investment in joint venture under equity method investment |  |  |  |  |  |
Depreciation and amortization |  |  | $ 109.2 us-gaap_DepreciationDepletionAndAmortization | $ 115.1 us-gaap_DepreciationDepletionAndAmortization | $ 107.8 us-gaap_DepreciationDepletionAndAmortization |
SPX's equity earnings in EGS |  |  | 1.4 us-gaap_IncomeLossFromEquityMethodInvestments | 42.2 us-gaap_IncomeLossFromEquityMethodInvestments | 38.6 us-gaap_IncomeLossFromEquityMethodInvestments |
EGS Electrical Group, LLC and Subsidiaries ("EGS") |  |  |  |  |  |
Investment in joint venture under equity method investment |  |  |  |  |  |
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
Lag in including results in consolidated statements |  |  |  | 3 months |  |
Proceeds from sale of interest in joint venture | 574.1 us-gaap_EquityMethodInvestmentNetSalesProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 574.1 us-gaap_EquityMethodInvestmentNetSalesProceeds / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |  |  |
Gain on sale of interest in joint venture |  | 491.2 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 491.2 us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |  |
Revenues |  |  |  | 517.5 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 527.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |
Gross profit |  |  |  | 223.3 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 221.9 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |
Income from continuing operations |  |  |  | 89.4 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 87.9 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |
Net income |  |  |  | 89.4 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 87.9 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |
Capital expenditures |  |  |  | 13.3 spw_EquityMethodInvestmentCapitalExpenditures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 12.0 spw_EquityMethodInvestmentCapitalExpenditures / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |
Depreciation and amortization |  |  |  | 11.0 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 10.4 us-gaap_DepreciationDepletionAndAmortization / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |
Dividends received by SPX |  |  |  | 30.3 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 35.2 us-gaap_EquityMethodInvestmentDividendsOrDistributions / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |
Undistributed earnings attributable to SPX Corporation |  |  |  | 20.0 spw_EquityMethodInvestmentUndistributedEarnings / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 8.4 spw_EquityMethodInvestmentUndistributedEarnings / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |
SPX's equity earnings in EGS |  |  | 0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 41.9 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember | 39.0 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |
Carrying value of investment |  |  |  | 81.8 us-gaap_EquityMethodInvestments / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |
Condensed balance sheet information of EGS, assets |  |  |  |  |  |
Current assets |  |  |  | 180.4 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |
Non-current assets |  |  |  | 336.4 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |
Condensed balance sheet information of EGS, liabilities |  |  |  |  |  |
Current liabilities |  |  |  | 108.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |
Non-current liabilities |  |  |  | $ 24.0 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = spw_EGSElectricalGroupLLCAndSubsidiariesMember |  |

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