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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Apr. 01, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | $ 5,733.7 |  | $ 4,998.5 |
Segment earnings | 462.9 |  | 416.7 |
Depreciation and amortization | 120.2 |  | 96.9 |
Capital expenditures | 162.8 |  | 120.8 |
Total assets | 12,681.2 | [1] | 10,600.5 | $ 11,945.9
Operating segments | Seating |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 4,329.9 |  | 3,868.0 |
Segment earnings | 339.5 |  | 320.3 |
Depreciation and amortization | 80.0 |  | 65.0 |
Capital expenditures | 112.3 |  | 82.7 |
Total assets | 7,901.5 |  | 6,824.5 |
Operating segments | E-Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 1,403.8 |  | 1,130.5 |
Segment earnings | 190.8 |  | 164.9 |
Depreciation and amortization | 36.6 |  | 28.3 |
Capital expenditures | 48.2 |  | 29.5 |
Total assets | 2,631.3 |  | 1,835.7 |
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues from external customers | 0.0 |  | 0.0 |
Segment earnings | (67.4) |  | (68.5) |
Depreciation and amortization | 3.6 |  | 3.6 |
Capital expenditures | 2.3 |  | 8.6 |
Total assets | $ 2,148.4 |  | $ 1,940.3 |
[1] | Unaudited.

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