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Segment Reporting - Schedule of Reconciliation of Consolidated Segment Earnings to Consolidated Income Before Provision for Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2025 | Jun. 29, 2024 | Jun. 28, 2025 | Jun. 29, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |  |
Revenue | $ 6,030.4 | $ 6,012.4 | $ 11,590.7 | $ 12,007.0
Cost of sales | 5,591.3 | 5,563.6 | 10,792.4 | 11,160.1
Gross margin | 439.1 | 448.8 | 798.3 | 846.9
Selling, general and administrative | 186.3 | 175.3 | 358.7 | 361.8
Amortization of intangibles | 4.7 | 12.7 | 9.9 | 27.8
Intersegment support activities | 0.0 | 0.0 | 0.0 | 0.0
Segment earnings | 248.1 | 260.8 | 429.7 | 457.3
Interest expense, net | 25.4 | 26.9 | 51.2 | 53.0
Other expense, net | 5.2 | 7.4 | 25.6 | 20.9
Consolidated income before provision for income taxes and equity in net income of affiliates | 217.5 | 226.5 | 352.9 | 383.4
Seating |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |  |
Revenue | 4,473.9 | 4,447.0 | 8,625.0 | 8,924.6
E-Systems |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |  |
Revenue | 1,556.5 | 1,565.4 | 2,965.7 | 3,082.4
Operating segments | Seating |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |  |
Revenue | 4,473.9 | 4,447.0 | 8,625.0 | 8,924.6
Cost of sales | 4,092.0 | 4,073.3 | 7,937.9 | 8,211.8
Gross margin | 384.8 | 374.4 | 691.2 | 714.2
Selling, general and administrative | 95.8 | 87.2 | 181.3 | 174.2
Amortization of intangibles | 2.9 | 9.7 | 6.3 | 19.5
Intersegment support activities | 1.6 | 1.5 | 3.4 | 2.9
Segment earnings | 284.5 | 276.0 | 500.2 | 517.6
Operating segments | E-Systems |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |  |
Revenue | 1,556.5 | 1,565.4 | 2,965.7 | 3,082.4
Cost of sales | 1,528.6 | 1,510.8 | 2,906.0 | 2,981.8
Gross margin | 96.6 | 113.2 | 191.8 | 216.8
Selling, general and administrative | 37.2 | 38.9 | 72.7 | 80.9
Amortization of intangibles | 1.8 | 3.0 | 3.6 | 8.3
Intersegment support activities | 2.4 | 1.8 | 4.8 | 4.0
Segment earnings | 55.2 | 69.5 | 110.7 | 123.6
Intersegment revenues |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |  |
Revenue | (71.6) | (59.3) | (136.2) | (117.6)
Intersegment revenues | Seating |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |  |
Revenue | 2.9 | 0.7 | 4.1 | 1.4
Intersegment revenues | E-Systems |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |  |
Revenue | 68.7 | 58.6 | 132.1 | 116.2
Other |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated |  |  |  |
Revenue | 0.0 | 0.0 | 0.0 | 0.0
Cost of sales | (29.3) | (20.5) | (51.5) | (33.5)
Gross margin | (42.3) | (38.8) | (84.7) | (84.1)
Selling, general and administrative | 53.3 | 49.2 | 104.7 | 106.7
Amortization of intangibles | 0.0 | 0.0 | 0.0 | 0.0
Intersegment support activities | (4.0) | (3.3) | (8.2) | (6.9)
Segment earnings | $ (91.6) | $ (84.7) | $ (181.2) | $ (183.9)

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