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Consolidated Statements of Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]      
Issuance of common stock related to exercises of warrants, shares 205,526us-gaap_StockIssuedDuringPeriodSharesOther 195,974us-gaap_StockIssuedDuringPeriodSharesOther 38,017us-gaap_StockIssuedDuringPeriodSharesOther
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures 868,746us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation 207,468us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation 541,890us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Issuance of common stock related to share based compensation, per shares $ 50.19lea_StockIssuedDuringPeriodFromTreasuryStockValueShareBasedCompensationPerShare $ 45.11lea_StockIssuedDuringPeriodFromTreasuryStockValueShareBasedCompensationPerShare $ 43.46lea_StockIssuedDuringPeriodFromTreasuryStockValueShareBasedCompensationPerShare
Common stock, shares repurchase 3,805,114us-gaap_TreasuryStockSharesAcquired 15,533,758us-gaap_TreasuryStockSharesAcquired 5,357,443us-gaap_TreasuryStockSharesAcquired
Common stock, shares repurchase price per share $ 93.52us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 54.08us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 41.59us-gaap_TreasuryStockAcquiredAverageCostPerShare
Treasury stock, shares retired 8,000,000us-gaap_TreasuryStockSharesRetired 20,000,000us-gaap_TreasuryStockSharesRetired  
Treasury stock, shares retired price per share $ 64.98lea_TreasuryStockRetiredAverageCostPerShare $ 49.53lea_TreasuryStockRetiredAverageCostPerShare