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Acquisitions (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2014
Dec. 31, 2014
Sep. 30, 2014
Mar. 31, 2012
Business Acquisition [Line Items]                    
Other Assets       $ 819.0us-gaap_Goodwill $ 926.8us-gaap_Goodwill $ 991.5us-gaap_Goodwill   $ 819.0us-gaap_Goodwill    
Additions for current year acquisitions   6.1us-gaap_GoodwillAcquiredDuringPeriod   19.0us-gaap_GoodwillAcquiredDuringPeriod 6.1us-gaap_GoodwillAcquiredDuringPeriod          
Bargain purchase gain 9.0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount     0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount 8.8us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount 0us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount        
Liquidation of (investment in) unconsolidated entity 21.2leg_InvestmentinLiquidationofCostMethodInvestment   22.4leg_InvestmentinLiquidationofCostMethodInvestment 0leg_InvestmentinLiquidationofCostMethodInvestment (21.2)leg_InvestmentinLiquidationofCostMethodInvestment 22.4leg_InvestmentinLiquidationofCostMethodInvestment        
Interest Earned on Cost Method Investments 1.8leg_InterestEarnedonCostMethodInvestments                  
Tempur Sealy                    
Business Acquisition [Line Items]                    
Other Assets                 0us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= leg_TempurSealyMember
 
Business Combination, Consideration Transferred             0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= leg_TempurSealyMember
     
Kintec Solution                    
Business Acquisition [Line Items]                    
Other Assets       0us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= leg_KintecSolutionMember
      0us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= leg_KintecSolutionMember
   
Business Combination, Consideration Transferred               0us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= leg_KintecSolutionMember
   
Aerospace Tubing Manufacturer based in France                    
Business Acquisition [Line Items]                    
Cash purchase price paid for acquisition 14.5us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= leg_AerospaceTubingManufacturerbasedinFranceMember
              11.7us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= leg_AerospaceTubingManufacturerbasedinFranceMember
 
Bargain purchase gain 8.8us-gaap_BusinessCombinationBargainPurchaseGainRecognizedAmount
/ us-gaap_BusinessAcquisitionAxis
= leg_AerospaceTubingManufacturerbasedinFranceMember
                 
Western                    
Business Acquisition [Line Items]                    
Cash purchase price paid for acquisition                   $ 188.2us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= leg_WesternPneumaticTubeHoldingLlcMember