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Segment Reporting - Reconciliation of Consolidated Segment Earnings to Consolidated Income Before Provision for Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |
Revenues | $ 23,306.0 | $ 23,466.9 | $ 20,891.5
Cost of sales | 21,666.7 | 21,756.5 | 19,481.6
Gross margin | 1,639.3 | 1,710.4 | 1,409.9
Selling, general and administrative expenses | 702.5 | 714.7 | 684.8
Amortization of intangible assets | 49.1 | 62.5 | 70.8
Intersegment support activities | 0.0 | 0.0 | 0.0
Segment earnings | 887.7 | 933.2 | 654.3
Interest expense, net | 106.2 | 101.1 | 98.6
Other expense, net | 48.6 | 54.9 | 46.4
Consolidated income before provision for income taxes and equity in net income of affiliates | 732.9 | 777.2 | 509.3
Seating |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |
Revenues | 17,222.1 | 17,548.8 | 15,711.2
E-Systems |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |
Revenues | 6,083.9 | 5,918.1 | 5,180.3
Operating Segments | Seating |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |
Revenues | 17,222.1 | 17,548.8 | 15,711.2
Cost of sales | 15,845.5 | 16,090.0 | 14,472.2
Gross margin | 1,380.0 | 1,459.4 | 1,241.3
Selling, general and administrative expenses | 348.7 | 346.5 | 306.9
Amortization of intangible assets | 37.2 | 39.0 | 38.6
Intersegment support activities | 5.6 | 7.0 | 2.8
Segment earnings | 988.5 | 1,066.9 | 893.0
Operating Segments | E-Systems |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |
Revenues | 6,083.9 | 5,918.1 | 5,180.3
Cost of sales | 5,892.2 | 5,730.4 | 5,078.8
Gross margin | 421.8 | 412.6 | 289.9
Selling, general and administrative expenses | 154.6 | 156.6 | 178.7
Amortization of intangible assets | 11.9 | 23.5 | 32.2
Intersegment support activities | 7.9 | 3.6 | 4.6
Segment earnings | 247.4 | 228.9 | 74.4
Intersegment Eliminations |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |
Revenues | (233.5) | (225.5) | (190.7)
Intersegment Eliminations | Seating |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |
Revenues | 3.4 | 0.6 | 2.3
Intersegment Eliminations | E-Systems |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |
Revenues | 230.1 | 224.9 | 188.4
Other |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |
Revenues | 0.0 | 0.0 | 0.0
Cost of sales | (71.0) | (63.9) | (69.4)
Gross margin | (162.5) | (161.6) | (121.3)
Selling, general and administrative expenses | 199.2 | 211.6 | 199.2
Amortization of intangible assets | 0.0 | 0.0 | 0.0
Intersegment support activities | (13.5) | (10.6) | (7.4)
Segment earnings | $ (348.2) | $ (362.6) | $ (313.1)

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