Segment Reporting - Depreciation and Amortization Expense (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2024 |
Sep. 30, 2023 |
Sep. 30, 2024 |
Sep. 30, 2023 |
|
| Segment Reporting Information | ||||
| Depreciation and amortization | $ 101.9 | $ 96.8 | $ 307.2 | $ 281.8 |
| Truckload | ||||
| Segment Reporting Information | ||||
| Depreciation and amortization | 74.3 | 70.2 | 224.6 | 205.4 |
| Intermodal | ||||
| Segment Reporting Information | ||||
| Depreciation and amortization | 13.3 | 13.3 | 40.2 | 39.8 |
| Logistics | ||||
| Segment Reporting Information | ||||
| Depreciation and amortization | 0.0 | 0.0 | 0.0 | 0.1 |
| Other | ||||
| Segment Reporting Information | ||||
| Depreciation and amortization | $ 14.3 | $ 13.3 | $ 42.4 | $ 36.5 |