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Summary of Significant Accounting Policies (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
item
Dec. 31, 2013
Dec. 31, 2012
Foreign Currency Translation and Transactions      
Foreign currency transaction (gain) loss $ 7.1us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 15.6us-gaap_ForeignCurrencyTransactionGainLossBeforeTax $ 12.4us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Revenue Recognition      
Number of business units in which sales incentive programs are significant 1spw_NumberOfBusinessUnitsInWhichSalesIncentiveProgramsAreSignificant    
Revenues recognized under percentage of completion method 1,206.4spw_RevenueUnderPercentageOfCompletionMethod 1,343.8spw_RevenueUnderPercentageOfCompletionMethod 1,594.7spw_RevenueUnderPercentageOfCompletionMethod
Costs and estimated earnings on uncompleted contracts      
Costs incurred on uncompleted contracts 3,232.6spw_CostsIncurredOnUncompletedContracts 3,767.4spw_CostsIncurredOnUncompletedContracts  
Estimated earnings to date 591.1spw_EstimatedEarningsToDate 813.2spw_EstimatedEarningsToDate  
Aggregate costs incurred on uncompleted contracts and estimated earnings to date 3,823.7spw_AggregateCostsIncurredOnUncompletedContractsAndEstimatedEarningsToDate 4,580.6spw_AggregateCostsIncurredOnUncompletedContractsAndEstimatedEarningsToDate  
Less: Billings to date (3,765.5)spw_BillingsToDate (4,517.9)spw_BillingsToDate  
Net costs and estimated earnings in excess of billings after the acquisition of Clyde Union (Holdings) S.A.R.L. ("Clyde Union") 58.2spw_NetBillingsInExcessOfBillingsAfterAcquisition 62.7spw_NetBillingsInExcessOfBillingsAfterAcquisition  
Net costs and estimated earnings in excess of billings assumed in the acquisition of Clyde Union (Holdings) S.A.R.L. ("Clyde Union")   4.2spw_NetBillingsInExcessOfBillingsAssumedInAcquisition  
Net costs and estimated earnings in excess of billings 58.2spw_NetBillingsInExcessOfCostsAndEstimatedEarnings 66.9spw_NetBillingsInExcessOfCostsAndEstimatedEarnings  
Billings in excess of costs and estimated earnings      
Costs and estimated earnings in excess of billings 237.1us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms 285.3us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms  
Billings in excess of costs and estimated earnings on uncompleted contracts (178.9)us-gaap_BillingsInExcessOfCost (218.4)us-gaap_BillingsInExcessOfCost  
Net costs and estimated earnings in excess of billings 58.2spw_NetBillingsInExcessOfCostsAndEstimatedEarnings 66.9spw_NetBillingsInExcessOfCostsAndEstimatedEarnings  
Research and Development Costs      
Research and development expense 51.1us-gaap_ResearchAndDevelopmentExpense 47.3us-gaap_ResearchAndDevelopmentExpense 49.0us-gaap_ResearchAndDevelopmentExpense
Property, plant and equipment      
Depreciation expense, including amortization of capital leases 77.4spw_DepreciationExpenseAndAmortizationOfCapitalLeases 82.1spw_DepreciationExpenseAndAmortizationOfCapitalLeases 73.7spw_DepreciationExpenseAndAmortizationOfCapitalLeases
Interest capitalized $ 0us-gaap_InterestCostsIncurredCapitalized $ 0us-gaap_InterestCostsIncurredCapitalized $ 0.5us-gaap_InterestCostsIncurredCapitalized
Minimum      
Property, plant and equipment      
Period for receivables to be collected which are not significant 1 year    
Buildings | Maximum      
Property, plant and equipment      
Useful lives of property, plant and equipment (in years) 40 years    
Machinery and equipment | Minimum      
Property, plant and equipment      
Useful lives of property, plant and equipment (in years) 3 years    
Machinery and equipment | Maximum      
Property, plant and equipment      
Useful lives of property, plant and equipment (in years) 15 years