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Quarterly Financial Data (unaudited) - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ (21.2) |  |  |  |  |  |  | $ 21.2 | $ 0.0 | $ 14.3
Net tax benefits | $ 30.2 | 14.0 | $ 35.3 | $ 19.1 | $ 9.1 | $ 2.4 | $ 7.1 | $ 5.0 |  |  |
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (197.5) | (370.2) | (285.5)
Transition tax on accumulated foreign earnings | 131.0 |  |  |  |  |  |  |  | $ 131.0 | $ 0.0 | $ 0.0
U.S. corporate tax rate |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
U.S. | Pension |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension settlement gain (loss) |  |  |  |  | $ (34.2) |  |  |  | $ (0.2) | $ (34.4) | $ (0.2)
Foreign Tax Authority |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | 289.7 |  |  |  |  |  |  |  |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | 146.4 |  |  |  |  |  |  |  |  |  |
U.S. |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | $ (42.5) |  |  |  |  |  |  |  |  |  |
Beijing BAI Lear Automotive Systems Co., Ltd. |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consolidation of affiliate, revaluation gain |  | $ 54.2 |  |  |  |  | $ 30.3 |  | $ 30.3 |  |

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