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GENERAL AND SIGNIFICANT ACCOUNTING POLICIES (Tables) | 9 Months Ended
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Sep. 30, 2025
Schedule of prepaid expenses and other assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
Prepaid Expenses and Other Assets (in millions) |  | 2025 |  | 2024
Vessel fuel | ​ | $ | 31.0 | ​ | $ | 31.2
Prepaid insurance and insurance related receivables | ​ |  | 19.6 | ​ |  | 19.1
Prepaid operating expenses | ​ | ​ | 12.1 | ​ | ​ | 8.8
Other prepaid expenses | ​ | ​ | 10.9 | ​ | ​ | 9.9
Other assets | ​ |  | 2.7 | ​ |  | 4.9
Total | ​ | $ | 76.3 | ​ | $ | 73.9
Ocean Transportation |
Schedule of principal revenue generating activities by segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended |  | Nine Months Ended
​ | ​ | September 30, |  | September 30,
Ocean Transportation (in millions) (1) | ​ | 2025 |  | 2024 |  | 2025 |  | 2024
Ocean Transportation services | ​ | $ | 713.4 | ​ | $ | 787.9 | ​ | $ | 2,017.3 | ​ | $ | 2,027.9
Terminal and other related services | ​ | ​ | 1.9 | ​ | ​ | 7.4 | ​ | ​ | 6.3 | ​ | ​ | 27.1
Fuel sales | ​ | ​ | 3.0 | ​ | ​ | 3.3 | ​ | ​ | 7.7 | ​ | ​ | 9.3
Vessel management and related services | ​ | ​ | — | ​ | ​ | 0.1 | ​ | ​ | — | ​ | ​ | 3.3
Total | ​ | $ | 718.3 | ​ | $ | 798.7 | ​ | $ | 2,031.3 | ​ | $ | 2,067.6
(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 |  | Nine Months Ended
​ | ​ | September 30, |  | September 30,
Logistics (in millions) (1) | ​ | 2025 | ​ | 2024 | ​ | 2025 | ​ | 2024
Transportation Brokerage and Freight Forwarding services | ​ | $ | 142.3 | ​ | $ | 143.1 | ​ | $ | 406.8 | ​ | $ | 409.7
Warehousing services | ​ | ​ | 10.7 | ​ | ​ | 10.6 | ​ | ​ | 29.7 | ​ | ​ | 30.0
Supply Chain Management services | ​ |  | 8.8 | ​ |  | 9.6 | ​ |  | 24.8 | ​ |  | 24.2
Total | ​ | $ | 161.8 | ​ | $ | 163.3 | ​ | $ | 461.3 | ​ | $ | 463.9
(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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