Restructuring - Schedule of Income Statement Location (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jul. 04, 2026 |
Jun. 28, 2025 |
Jul. 04, 2026 |
Jun. 28, 2025 |
|
| Restructuring Cost and Reserve | ||||
| Restructuring costs and asset impairment charges | $ 26.9 | $ 34.2 | $ 69.0 | $ 117.8 |
| Location, Statement of Income, Balance [Axis]: us-gaap:CostOfGoodsAndServicesSold | ||||
| Restructuring Cost and Reserve | ||||
| Restructuring costs and asset impairment charges | 57.3 | 104.3 | ||
| Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense | ||||
| Restructuring Cost and Reserve | ||||
| Restructuring costs and asset impairment charges | 13.3 | 15.0 | ||
| Location, Statement of Income, Balance [Axis]: lear:OtherIncomeExpenseNet | ||||
| Restructuring Cost and Reserve | ||||
| Restructuring costs and asset impairment charges | $ (1.6) | $ (1.5) | ||