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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers | $ 4,817.6 | $ 4,825.0 | $ 5,007.6 | $ 5,160.1 | $ 4,942.4 | $ 4,891.6 | $ 5,580.8 | $ 5,733.7 | $ 19,810.3 | $ 21,148.5 | $ 20,467.0
Segment earnings |  |  |  |  |  |  |  |  | 1,070.2 | 1,654.1 | 1,608.3
Depreciation and amortization |  |  |  |  |  |  |  |  | 509.9 | 484.4 | 427.7
Capital expenditures |  |  |  |  |  |  |  |  | 603.9 | 677.0 | 594.5
Total assets | 12,680.7 |  |  |  | 11,600.7 |  |  |  | 12,680.7 | 11,600.7 |
Operating segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Segment earnings |  |  |  |  |  |  |  |  | 1,327.5 | 1,892.1 | 1,892.4
Operating segments | Seating |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 15,097.2 | 16,021.9 | 15,873.0
Segment earnings |  |  |  |  |  |  |  |  | 961.2 | 1,263.6 | 1,250.8
Depreciation and amortization |  |  |  |  |  |  |  |  | 331.0 | 323.5 | 289.5
Capital expenditures |  |  |  |  |  |  |  |  | 370.4 | 459.8 | 398.3
Total assets | 7,277.6 |  |  |  | 6,857.5 |  |  |  | 7,277.6 | 6,857.5 |
Operating segments | E-Systems |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 4,713.1 | 5,126.6 | 4,594.0
Segment earnings |  |  |  |  |  |  |  |  | 366.3 | 628.5 | 641.6
Depreciation and amortization |  |  |  |  |  |  |  |  | 163.0 | 146.2 | 123.4
Capital expenditures |  |  |  |  |  |  |  |  | 213.9 | 208.4 | 176.3
Total assets | 3,068.1 |  |  |  | 2,452.0 |  |  |  | 3,068.1 | 2,452.0 |
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Segment earnings |  |  |  |  |  |  |  |  | (257.3) | (238.0) | (284.1)
Depreciation and amortization |  |  |  |  |  |  |  |  | 15.9 | 14.7 | 14.8
Capital expenditures |  |  |  |  |  |  |  |  | 19.6 | 8.8 | $ 19.9
Total assets | $ 2,335.0 |  |  |  | $ 2,291.2 |  |  |  | $ 2,335.0 | $ 2,291.2 |

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