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Equity Method Investments (Details)
Dec. 31, 2014
ventures
Mar. 28, 2013
Schedule of Equity Method Investments [Line Items]    
Number of Joint Ventures 7fls_NumberOfJointVentures  
India    
Schedule of Equity Method Investments [Line Items]    
Number of Joint Ventures 1fls_NumberOfJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_IN		  
Japan    
Schedule of Equity Method Investments [Line Items]    
Number of Joint Ventures 1fls_NumberOfJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_JP		  
Saudi Arabia    
Schedule of Equity Method Investments [Line Items]    
Number of Joint Ventures 1fls_NumberOfJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_SA		  
South Korea    
Schedule of Equity Method Investments [Line Items]    
Number of Joint Ventures 1fls_NumberOfJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_KR		  
United Arab Emirates    
Schedule of Equity Method Investments [Line Items]    
Number of Joint Ventures 1fls_NumberOfJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_AE		  
China    
Schedule of Equity Method Investments [Line Items]    
Number of Joint Ventures 2fls_NumberOfJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_CN		  
Audco    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage   50.00%fls_EquityMethodInvestmentPercentageOwnershipSold
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= fls_AudcoMember