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DISCONTINUED OPERATIONS (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Discontinued Operations    
Gain (loss) on sale of business, net of tax $ (0.4)us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax $ 21.0us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Income (loss) from discontinued operations and related income taxes    
Income (loss) from discontinued operations (0.4)us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax 33.9us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax
Income tax provision   (12.8)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation
Income (loss) from discontinued operations, net (0.4)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax 21.1us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Results of operations for discontinued operations    
Revenues   26.0us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
TPS    
Discontinued Operations    
Cash consideration   38.5us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= spw_ThermalProductSolutionsMember
Promissory note receivable as consideration on sale of business   4.0spw_PromissoryNoteReceivableAsConsiderationOnDivestitureOfBusiness
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= spw_ThermalProductSolutionsMember
Gain (loss) on sale of business, net of tax   21.5us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= spw_ThermalProductSolutionsMember
Other businesses sold prior to the earliest date presented in the financial statements    
Discontinued Operations    
Adjustment to losses on sale of discontinued operations, net of tax $ 0.4us-gaap_DiscontinuedOperationAmountOfAdjustmentToPriorPeriodGainLossOnDisposalNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= spw_IndividuallyImmaterialDisposalGroupsIncludingDiscontinuedOperationsMember
$ 0.5us-gaap_DiscontinuedOperationAmountOfAdjustmentToPriorPeriodGainLossOnDisposalNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= spw_IndividuallyImmaterialDisposalGroupsIncludingDiscontinuedOperationsMember