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Acquisitions, Disposition and Exit of Joint Venture (Exit of Joint Venture) (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mar. 28, 2013
Schedule of Equity Method Investments [Line Items]        
Payments for acquisitions, net of cash acquired $ 0us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 76,801,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired $ 3,996,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain 15,315,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain 0us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain  
Equity Method Investment, Realized Gain (Loss) on Disposal 0us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal 12,995,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal 0us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal  
Audco        
Schedule of Equity Method Investments [Line Items]        
Percent of business acquired       100.00%fls_BusinessAcquisitionPercentageAcquired
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fls_AudcoMember
Payments for acquisitions, net of cash acquired       10,100,000us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fls_AudcoMember
Ownership percentage       50.00%fls_EquityMethodInvestmentPercentageOwnershipSold
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fls_AudcoMember
Proceeds from Sale of Equity Method Investments       46,200,000us-gaap_ProceedsFromSaleOfEquityMethodInvestments
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fls_AudcoMember
Equity Method Investment, Summarized Financial Information, Assets       25,000,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fls_AudcoMember
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain       15,300,000us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fls_AudcoMember
Equity Method Investment, Realized Gain (Loss) on Disposal       $ 13,000,000us-gaap_EquityMethodInvestmentRealizedGainLossOnDisposal
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fls_AudcoMember
Ownership percentage       50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fls_AudcoMember