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Long-Term Debt (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
lender
Dec. 31, 2013
Dec. 31, 2012
Short-term Debt [Line Items]      
Maximum borrowing capacity $ 600,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 600,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Number of lenders in syndicate 12leg_NumberOfLendersInSyndicate    
Debt to equity ratio, max 60.00%leg_LineOfCreditFacilityCovenantTermsDebtToEquityRatioMaximum    
Debt to assets ratio, max 15.00%leg_LineOfCreditFacilityCovenantTermsDebtToAssetsRatioMaximum    
Amount of assets, sold, transferred or disposed of in any trailing 4 quarters to total assets ratio, max 25.00%leg_LineOfCreditFacilityCovenantTermsAmountOfAssetsSoldTransferredOrDisposedOfInAnyTrailingFourQuartersToTotalAssetsRatio    
Commercial paper      
Short-term Debt [Line Items]      
Maximum borrowing capacity 600,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_CommercialPaperMember
   
Letters Of Credit      
Short-term Debt [Line Items]      
Maximum borrowing capacity     $ 250,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_LetterOfCreditMember