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Segment Reporting - Summary of Segment Financial Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues from external customers | $ 5,580.8 |  | $ 5,123.2 | $ 11,314.5 |  | $ 10,121.7 |
Segment earnings | 468.2 |  | 409.1 | 931.1 |  | 825.8 |
Depreciation and amortization | 121.8 |  | 104.6 | 242.0 |  | 201.5 |
Capital expenditures | 169.4 |  | 153.2 | 332.2 |  | 274.0 |
Total assets | 12,282.4 | [1] | 11,237.2 | 12,282.4 | [1] | 11,237.2 | $ 11,945.9
Seating |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues from external customers | 4,274.7 |  | 4,025.1 | 8,604.6 |  | 7,893.1 |
E-Systems |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues from external customers | 1,306.1 |  | 1,098.1 | 2,709.9 |  | 2,228.6 |
Operating segments | Seating |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues from external customers | 4,274.7 |  | 4,025.1 | 8,604.6 |  | 7,893.1 |
Segment earnings | 348.3 |  | 322.7 | 687.8 |  | 643.0 |
Depreciation and amortization | 81.4 |  | 71.5 | 161.4 |  | 136.5 |
Capital expenditures | 113.7 |  | 94.7 | 226.0 |  | 177.4 |
Total assets | 7,508.2 |  | 7,397.7 | 7,508.2 |  | 7,397.7 |
Operating segments | E-Systems |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues from external customers | 1,306.1 |  | 1,098.1 | 2,709.9 |  | 2,228.6 |
Segment earnings | 175.1 |  | 156.3 | 365.9 |  | 321.2 |
Depreciation and amortization | 36.9 |  | 29.4 | 73.5 |  | 57.7 |
Capital expenditures | 52.4 |  | 54.0 | 100.6 |  | 83.5 |
Total assets | 2,530.3 |  | 1,880.8 | 2,530.3 |  | 1,880.8 |
Other |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Revenues from external customers | 0.0 |  | 0.0 | 0.0 |  | 0.0 |
Segment earnings | (55.2) |  | (69.9) | (122.6) |  | (138.4) |
Depreciation and amortization | 3.5 |  | 3.7 | 7.1 |  | 7.3 |
Capital expenditures | 3.3 |  | 4.5 | 5.6 |  | 13.1 |
Total assets | $ 2,243.9 |  | $ 1,958.7 | $ 2,243.9 |  | $ 1,958.7 |
[1] | Unaudited.

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