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Investments in Affiliates and Other Related Party Transactions - Additional Information (Detail) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 08, 2017 | Jun. 21, 2016 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 31, 2018
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest |  |  | $ 153.4 |  |  |  | $ 0.0 |  |  |  | $ 153.4 | $ 0.0 |  |
Noncontrolling interest, change in redemption value |  |  |  |  |  |  |  |  |  |  | (25.5) |  |  |
Annual sales |  |  | 5,363.8 | $ 4,981.5 | $ 5,123.2 | $ 4,998.5 | $ 4,643.5 | $ 4,526.4 | $ 4,724.8 | $ 4,662.9 | 20,467.0 | 18,557.6 | $ 18,211.4 |
Shanghai Lear STEC Automotive Parts Co., Ltd. (China) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Annual sales |  |  |  |  |  |  |  |  |  |  | 280.0 |  |  |
Shanghai Lear STEC Automotive Parts Co., Ltd. (China) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, weighted average useful life | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of previously held equity interest in acquiree | $ 94.0 |  |  |  |  |  |  |  |  |  | 94.0 |  |  |
Noncontrolling interests, fair value | 125.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation of affiliate, revaluation gain | $ 54.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners | 45.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable noncontrolling interest |  |  | $ 153.4 |  |  |  |  |  |  |  | 153.4 |  |  |
Noncontrolling interest, change in redemption value |  |  |  |  |  |  |  |  |  |  | 25.5 |  |  |
Beijing BAI Lear Automotive Systems Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, weighted average useful life |  | 8 years |  |  |  |  |  |  |  |  |  |  |  |
Fair value of previously held equity interest in acquiree |  |  |  |  |  |  |  |  |  |  |  | $ 63.0 |  |
Noncontrolling interests, fair value |  | $ 41.0 |  |  |  |  |  |  |  |  |  |  |  |
Consolidation of affiliate, revaluation gain |  |  |  | $ 54.2 |  |  |  |  | $ 30.3 |  | $ 30.3 |  |  |
Equity method investment ownership interest |  |  |  |  |  |  | 46.00% |  |  |  |  | 46.00% | 30.00% |
Changchun Lear Faw Sihuan Automotive Electrical And Electronics Co Limited | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00%

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