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Summary of Significant Accounting Policies (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 item | Dec. 31, 2013 | Dec. 31, 2012
Foreign Currency Translation and Transactions |  |  |
Foreign currency transaction (gain) loss | $ 7.1 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ 15.6 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ 12.4 us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Revenue Recognition |  |  |
Number of business units in which sales incentive programs are significant | 1 spw_NumberOfBusinessUnitsInWhichSalesIncentiveProgramsAreSignificant |  |
Revenues recognized under percentage of completion method | 1,206.4 spw_RevenueUnderPercentageOfCompletionMethod | 1,343.8 spw_RevenueUnderPercentageOfCompletionMethod | 1,594.7 spw_RevenueUnderPercentageOfCompletionMethod
Costs and estimated earnings on uncompleted contracts |  |  |
Costs incurred on uncompleted contracts | 3,232.6 spw_CostsIncurredOnUncompletedContracts | 3,767.4 spw_CostsIncurredOnUncompletedContracts |
Estimated earnings to date | 591.1 spw_EstimatedEarningsToDate | 813.2 spw_EstimatedEarningsToDate |
Aggregate costs incurred on uncompleted contracts and estimated earnings to date | 3,823.7 spw_AggregateCostsIncurredOnUncompletedContractsAndEstimatedEarningsToDate | 4,580.6 spw_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") | 58.2 spw_NetBillingsInExcessOfBillingsAfterAcquisition | 62.7 spw_NetBillingsInExcessOfBillingsAfterAcquisition |
Net costs and estimated earnings in excess of billings assumed in the acquisition of Clyde Union (Holdings) S.A.R.L. ("Clyde Union") |  | 4.2 spw_NetBillingsInExcessOfBillingsAssumedInAcquisition |
Net costs and estimated earnings in excess of billings | 58.2 spw_NetBillingsInExcessOfCostsAndEstimatedEarnings | 66.9 spw_NetBillingsInExcessOfCostsAndEstimatedEarnings |
Billings in excess of costs and estimated earnings |  |  |
Costs and estimated earnings in excess of billings | 237.1 us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms | 285.3 us-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 | 58.2 spw_NetBillingsInExcessOfCostsAndEstimatedEarnings | 66.9 spw_NetBillingsInExcessOfCostsAndEstimatedEarnings |
Research and Development Costs |  |  |
Research and development expense | 51.1 us-gaap_ResearchAndDevelopmentExpense | 47.3 us-gaap_ResearchAndDevelopmentExpense | 49.0 us-gaap_ResearchAndDevelopmentExpense
Property, plant and equipment |  |  |
Depreciation expense, including amortization of capital leases | 77.4 spw_DepreciationExpenseAndAmortizationOfCapitalLeases | 82.1 spw_DepreciationExpenseAndAmortizationOfCapitalLeases | 73.7 spw_DepreciationExpenseAndAmortizationOfCapitalLeases
Interest capitalized | $ 0 us-gaap_InterestCostsIncurredCapitalized | $ 0 us-gaap_InterestCostsIncurredCapitalized | $ 0.5 us-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 |  |

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