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Stock-Based Compensation (Discount Stock Plan) (Details) (Discount Stock Plan, USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Discount Stock Plan
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Average 2014 purchase price per share (net of discount) $ 29.61leg_AveragePricePerShareEmployeePurchaseNetOfDiscount
/ us-gaap_AwardTypeAxis
= leg_DiscountStockPlanMember
2014 number of shares purchased by employees 0.1leg_NumberOfSharesPurchasedByEmployees
/ us-gaap_AwardTypeAxis
= leg_DiscountStockPlanMember
Shares purchased since inception in 1982 22.5leg_SharesPurchasedSinceInceptionIn1982
/ us-gaap_AwardTypeAxis
= leg_DiscountStockPlanMember
Maximum shares under the plan 23.0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= leg_DiscountStockPlanMember