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Summary of Significant Accounting Policies - Summary of Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |
Beginning balance | $ 1,405.3 | $ 1,401.3
Foreign currency translation and other | (10.0) | (18.4)
Ending balance | 1,614.3 | 1,405.3
Other acquisitions |  |
Goodwill [Roll Forward] |  |
Balance as of December 31, 2018 | 219.0 |
Lear FAWSN |  |
Goodwill [Roll Forward] |  |
Affiliate transaction |  | 22.4
Seating |  |
Goodwill [Roll Forward] |  |
Beginning balance | 1,244.3 | 1,274.4
Foreign currency translation and other | (8.9) | (30.1)
Ending balance | 1,235.4 | 1,244.3
Seating | Other acquisitions |  |
Goodwill [Roll Forward] |  |
Balance as of December 31, 2018 | 0.0 |
Seating | Lear FAWSN |  |
Goodwill [Roll Forward] |  |
Affiliate transaction |  | 0.0
E-Systems |  |
Goodwill [Roll Forward] |  |
Beginning balance | 161.0 | 126.9
Foreign currency translation and other | (1.1) | 11.7
Ending balance | 378.9 | 161.0
E-Systems | Other acquisitions |  |
Goodwill [Roll Forward] |  |
Balance as of December 31, 2018 | $ 219.0 |
E-Systems | Lear FAWSN |  |
Goodwill [Roll Forward] |  |
Affiliate transaction |  | $ 22.4

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