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Segment Reporting - Revenue by Segment (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
Operating revenues	$ 1,315.7	$ 1,352.0	$ 3,951.4	$ 4,127.2
Intersegment Eliminations
Segment Reporting Information
Operating revenues	(38.2)	(23.3)	(119.5)	(76.4)
Truckload | Operating Segments
Segment Reporting Information
Revenues (excluding fuel charge by segment)	532.2	535.3	1,610.6	1,605.0
Intermodal | Operating Segments
Segment Reporting Information
Revenues (excluding fuel charge by segment)	264.7	263.0	765.0	790.1
Logistics | Operating Segments
Segment Reporting Information
Revenues (excluding fuel charge by segment)	313.7	326.0	957.4	1,051.6
Other | Operating Segments
Segment Reporting Information
Operating revenues	105.2	78.4	295.1	249.5
Fuel Surcharge | Operating Segments
Segment Reporting Information
Operating revenues	$ 138.1	$ 172.6	$ 442.8	$ 507.4

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