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Goodwill (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
Goodwill [Roll Forward]  
Balance at January 1, 2017 $ 1,121.3
Foreign currency translation and other 49.1
Balance at September 30, 2017 1,387.1 [1]
Antolin Seating  
Goodwill [Roll Forward]  
Acquisition 122.6
Shanghai Lear Stec Automotive Parts Co Limited  
Goodwill [Roll Forward]  
Acquisition 94.1
Operating segments | Seating  
Goodwill [Roll Forward]  
Balance at January 1, 2017 1,091.2
Foreign currency translation and other 48.9
Balance at September 30, 2017 1,262.7
Operating segments | Seating | Antolin Seating  
Goodwill [Roll Forward]  
Acquisition 122.6
Operating segments | Seating | Shanghai Lear Stec Automotive Parts Co Limited  
Goodwill [Roll Forward]  
Acquisition 0.0
Operating segments | E-Systems  
Goodwill [Roll Forward]  
Balance at January 1, 2017 30.1
Foreign currency translation and other 0.2
Balance at September 30, 2017 124.4
Operating segments | E-Systems | Antolin Seating  
Goodwill [Roll Forward]  
Acquisition 0.0
Operating segments | E-Systems | Shanghai Lear Stec Automotive Parts Co Limited  
Goodwill [Roll Forward]  
Acquisition $ 94.1
[1] Unaudited.