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Long-Term Assets - Investment in Affiliates Additional Information (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 07, 2017 | Sep. 30, 2017 | Oct. 01, 2016 | Sep. 30, 2017 | Oct. 01, 2016 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consolidation of affiliate, revaluation gain |  |  |  |  |  |  | $ 30.3 |
Redeemable noncontrolling interest |  | $ 147.7 | [1] |  | $ 147.7 | [1] |  | $ 0.0
Noncontrolling interest, change in redemption value |  | 22.7 |  |  | 22.7 |  |  |
Annual sales |  | 4,981.5 |  | $ 4,526.4 | $ 15,103.2 |  | $ 13,914.1 |
Shanghai Lear Stec Automotive Parts Co Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Fair value of previously held equity interest | $ 94.0 |  |  |  |  |  |  |
Fair value of the noncontrolling interest | $ 125.0 |  |  |  |  |  |  |
Consolidation of affiliate, revaluation gain |  | $ 54.2 |  |  |  |  |  |
Noncontrolling interest, ownership percentage by noncontrolling owners |  | 45.00% |  |  | 45.00% |  |  |
Annual sales |  |  |  |  |  |  |  | $ 280.0
Shanghai Lear Stec Automotive Parts Co Limited | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired intangible assets, weighted average useful life | 12 years |  |  |  |  |  |  |
Other Income And Expense [Member] | Shanghai Lear Stec Automotive Parts Co Limited |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Consolidation of affiliate, revaluation gain |  | $ 54.2 |  |  | $ 54.2 |  |  |
[1] | Unaudited.

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