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Summary of Significant Accounting Policies - Summary of Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill [Line Items]    
Ending balance $ 726.2us-gaap_Goodwill $ 757.2us-gaap_Goodwill
Seating    
Goodwill [Line Items]    
Beginning balance 757.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lea_SeatingMember		 746.5us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lea_SeatingMember
Foreign currency translation and other (31.0)lea_GoodwillTranslationAdjustmentsAndOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= lea_SeatingMember		 10.7lea_GoodwillTranslationAdjustmentsAndOtherChanges
/ us-gaap_StatementBusinessSegmentsAxis
= lea_SeatingMember
Ending balance $ 726.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lea_SeatingMember		 $ 757.2us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= lea_SeatingMember