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Quarterly Financial Data (unaudited) - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2019 | Jan. 31, 2018 | Dec. 31, 2019 | Sep. 28, 2019 | Jun. 29, 2019 | Mar. 30, 2019 | Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense (benefit) on valuation allowances on the deferred tax assets of a certain foreign subsidiary |  |  | $ 32.2 |  |  |  | $ 11.1 |  |  |  | $ 1.2 | $ (52.4) | $ (56.8)
Tax benefit on restructuring charges and various other items |  |  |  |  |  |  | 8.6 | $ 7.5 |  | $ 4.1 |  |  |
Tax benefit on share-based compensation |  |  |  |  |  | $ 3.2 |  |  |  | 10.1 |  |  |
Net tax benefits |  |  |  |  | $ 10.6 |  |  |  |  |  |  |  |
Research and development and other tax credits |  |  |  | $ 28.6 |  |  |  |  |  |  | 40.8 | 9.9 | 26.8
Gain from deconsolidation | $ 4.0 |  |  | 4.0 |  |  |  |  |  |  |  |  |
Tax expense on increase in foreign withholding tax on certain undistributed foreign earnings |  |  |  |  |  |  |  |  |  | 22.0 | 0.0 | 0.0 | (289.7)
Tax audits and assessments |  |  |  |  |  |  | $ 15.8 |  | $ 17.4 |  | 0.4 | 6.9 | (1.4)
U.S. tax rate change and other tax reform items |  |  |  |  |  |  |  |  |  |  | 0.0 | $ 9.8 | $ 42.5
Impairment loss |  |  | 5.0 |  |  |  |  |  |  |  | $ 5.0 |  |
Foreign Tax Authority |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense (benefit) on valuation allowances on the deferred tax assets of a certain foreign subsidiary |  |  |  |  | 10.4 | 18.4 |  |  |  | 35.1 |  |  |
Tax benefit on restructuring charges and various other items |  |  | 14.1 | $ 9.1 | $ 11.0 | $ 15.6 |  |  |  |  |  |  |
U.S. tax rate change and other tax reform items |  |  |  |  |  |  |  | 7.2 |  |  |  |  |
U.S. |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefits on adjustment to 2017 provisional U.S. income tax expense |  |  |  |  |  |  |  | $ 6.9 |  |  |  |  |
Lear FAWSN |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation of affiliate, revaluation gain |  | $ 10.0 |  |  |  |  |  |  |  | $ 10.0 |  |  |
Foreign |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Curtailment gain (loss) |  |  | $ 12.9 |  |  |  |  |  |  |  |  |  |

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