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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     $ 109.2us-gaap_DepreciationDepletionAndAmortization $ 115.1us-gaap_DepreciationDepletionAndAmortization $ 107.8us-gaap_DepreciationDepletionAndAmortization  
SPX's equity earnings in EGS     1.4us-gaap_IncomeLossFromEquityMethodInvestments 42.2us-gaap_IncomeLossFromEquityMethodInvestments 38.6us-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 574.1us-gaap_EquityMethodInvestmentNetSalesProceeds
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
574.1us-gaap_EquityMethodInvestmentNetSalesProceeds
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
       
Gain on sale of interest in joint venture   491.2us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
491.2us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
     
Revenues       517.5us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
527.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
 
Gross profit       223.3us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
221.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationGrossProfitLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
 
Income from continuing operations       89.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
87.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationIncomeLossFromContinuingOperationsBeforeExtraordinaryItems
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
 
Net income       89.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
87.9us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
 
Capital expenditures       13.3spw_EquityMethodInvestmentCapitalExpenditures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
12.0spw_EquityMethodInvestmentCapitalExpenditures
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
 
Depreciation and amortization       11.0us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
10.4us-gaap_DepreciationDepletionAndAmortization
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
 
Dividends received by SPX       30.3us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
35.2us-gaap_EquityMethodInvestmentDividendsOrDistributions
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
 
Undistributed earnings attributable to SPX Corporation       20.0spw_EquityMethodInvestmentUndistributedEarnings
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
8.4spw_EquityMethodInvestmentUndistributedEarnings
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
 
SPX's equity earnings in EGS     0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
41.9us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
39.0us-gaap_IncomeLossFromEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
 
Carrying value of investment       81.8us-gaap_EquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
   
Condensed balance sheet information of EGS, assets            
Current assets       180.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
   
Non-current assets       336.4us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
   
Condensed balance sheet information of EGS, liabilities            
Current liabilities       108.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationCurrentLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember
   
Non-current liabilities       $ 24.0us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNoncurrentLiabilities
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= spw_EGSElectricalGroupLLCAndSubsidiariesMember