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Stock-Based Compensation Plans (Disclosures by Compensation Plans) (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2010
Jun. 22, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options granted during period 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod    
Plan 2010      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized to issue under share based compensation plans   8,700,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= fls_Plan2010Member
 
Common stock available under stock option plan 5,085,954us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= fls_Plan2010Member
   
Plan 2004      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Expired     827,835fls_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesExpired
/ us-gaap_PlanNameAxis
= fls_Plan2004Member