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Quarterly Financial Data (unaudited) - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense (benefit) on valuation allowances on the deferred tax assets of a certain foreign subsidiary |  |  | $ 11.1 |  |  |  |  |  |  |  | $ (52.4) | $ (56.8) | $ (44.2)
Tax benefit on share-based compensation |  |  |  |  |  | $ 10.1 |  |  |  |  |  |  |
Tax benefit on restructuring charges and various other items |  |  | 8.6 | $ 7.5 |  | 4.1 |  |  |  |  |  |  |
Tax expense on increase in foreign withholding tax on certain undistributed foreign earnings |  |  |  |  |  | 22.0 |  |  |  |  | 0.0 | (289.7) | 0.0
Favorable settlements |  |  | $ 15.8 |  | $ 17.4 |  |  |  |  |  | (6.9) | 1.4 | 1.8
Tax benefit on tax rate change |  |  |  |  |  |  |  |  |  |  | (9.8) | (42.5) | 0.0
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  | 311.9 | 197.5 | 370.2
Loss on extinguishment of debt |  |  |  |  |  |  |  | $ (21.2) |  |  | 0.0 | 21.2 | 0.0
Net tax benefits |  |  |  |  |  |  | $ 30.2 | $ 14.0 | $ 35.3 | $ 19.1 |  |  |
Transition tax on accumulated foreign earnings |  |  |  |  |  |  | 131.0 |  |  |  | (15.1) | $ 131.0 | 0.0
Foreign Tax Authority |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax expense (benefit) on valuation allowances on the deferred tax assets of a certain foreign subsidiary |  |  |  |  |  | (35.1) |  |  |  |  |  |  |
Tax benefit on tax rate change |  |  |  | 7.2 |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  | (289.7) |  |  |  |  |  |
U.S. |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefits on adjustment to 2017 provisional U.S. income tax expense |  |  |  | $ 6.9 |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  | 42.5 |  |  |  |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  |  |  | (146.4) |  |  |  |  |  |
Lear FAWSN |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation of affiliate, revaluation gain | $ 10.0 |  |  |  |  | $ 10.0 |  |  |  |  |  |  |
Lear STEC |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidation of affiliate, revaluation gain |  | $ 54.2 |  |  |  |  | $ 54.2 |  |  |  |  |  |
Pension | United States |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement charge |  |  |  |  |  |  |  |  |  |  | $ 5.4 |  | $ 34.2

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