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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.

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