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GENERAL AND SIGNIFICANT ACCOUNTING POLICIES (Tables) | 6 Months Ended
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Jun. 30, 2025
Schedule of prepaid expenses and other assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
Prepaid Expenses and Other Assets (in millions) |  | 2025 |  | 2024
Vessel fuel | ​ | $ | 31.7 | ​ | $ | 31.2
Prepaid insurance and insurance related receivables | ​ |  | 19.6 | ​ |  | 19.1
Prepaid operating expenses | ​ | ​ | 11.8 | ​ | ​ | 8.8
Income tax receivables, net | ​ | ​ | — | ​ | ​ | 2.0
Other | ​ |  | 13.2 | ​ |  | 12.8
Total | ​ | $ | 76.3 | ​ | $ | 73.9
Ocean Transportation |
Schedule of principal revenue generating activities by segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended |  | Six Months Ended
​ | ​ | June 30, |  | June 30,
Ocean Transportation (in millions) (1) | ​ | 2025 |  | 2024 |  | 2025 |  | 2024
Ocean Transportation services | ​ | $ | 671.0 | ​ | $ | 674.2 | ​ | $ | 1,303.9 | ​ | $ | 1,240.0
Terminal and other related services | ​ | ​ | 1.9 | ​ | ​ | 11.0 | ​ | ​ | 4.4 | ​ | ​ | 19.7
Fuel sales | ​ | ​ | 2.7 | ​ | ​ | 3.1 | ​ | ​ | 4.7 | ​ | ​ | 6.0
Vessel management and related services | ​ | ​ | — | ​ | ​ | 1.6 | ​ | ​ | — | ​ | ​ | 3.2
Total | ​ | $ | 675.6 | ​ | $ | 689.9 | ​ | $ | 1,313.0 | ​ | $ | 1,268.9
(1) | Ocean Transportation revenue transactions are primarily denominated in U.S. dollars except for less than 3 percent of Ocean Transportation services revenue and fuel sales revenue categories which are denominated in foreign currencies.
Logistics |
Schedule of principal revenue generating activities by segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended |  | Six Months Ended
​ | ​ | June 30, |  | June 30,
Logistics (in millions) (1) | ​ | 2025 | ​ | 2024 | ​ | 2025 | ​ | 2024
Transportation Brokerage and Freight Forwarding services | ​ | $ | 137.2 | ​ | $ | 139.2 | ​ | $ | 264.5 | ​ | $ | 266.6
Warehousing services | ​ | ​ | 10.0 | ​ | ​ | 10.3 | ​ | ​ | 19.0 | ​ | ​ | 19.4
Supply Chain Management services | ​ |  | 7.7 | ​ |  | 8.0 | ​ |  | 16.0 | ​ |  | 14.6
Total | ​ | $ | 154.9 | ​ | $ | 157.5 | ​ | $ | 299.5 | ​ | $ | 300.6
(1) | Logistics revenue transactions are primarily denominated in U.S. dollars except for less than 3 percent of Transportation Brokerage and Freight Forwarding services revenue, and Supply Chain Management services revenue categories which are denominated in foreign currencies.

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