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Segment Reporting - Income From Operations (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
Income from operations	$ 43.1	$ 46.7	$ 122.8	$ 265.1
Truckload
Segment Reporting Information
Income from operations	23.7	24.5	69.3	151.9
Intermodal
Segment Reporting Information
Income from operations	15.7	11.1	37.3	64.8
Logistics
Segment Reporting Information
Income from operations	7.6	8.5	24.2	39.8
Other
Segment Reporting Information
Income from operations	$ (3.9)	$ 2.6	$ (8.0)	$ 8.6

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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