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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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Dec. 31, 2023
Schedule of changes in the allowance for doubtful accounts receivable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Balance at |  | ​ |  | Write-offs |  | Balance at
Year (in millions) |  | Beginning of Year |  | Expense (1) |  | and Other |  | End of Year
2023 | ​ | $ | 13.0 | ​ | $ | (2.1) | ​ | $ | (1.0) | ​ | $ | 9.9
2022 | ​ | $ | 10.1 | ​ | $ | 3.2 | ​ | $ | (0.3) | ​ | $ | 13.0
2021 | ​ | $ | 6.3 | ​ | $ | 4.2 | ​ | $ | (0.4) | ​ | $ | 10.1
(1) | Expense is shown net of amounts recovered from previously reserved doubtful accounts receivable.
Schedule of prepaid expenses and other assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, |
Prepaid Expenses and Other Assets (in millions) |  | 2023 |  | 2022 |
Income tax receivables, net | ​ | $ | 125.2 | ​ | $ | 170.8 | ​
Prepaid fuel | ​ | ​ | 22.5 | ​ | ​ | 26.3 | ​
Prepaid insurance and insurance related receivables | ​ |  | 19.3 | ​ |  | 17.4 | ​
Restricted cash - vessel construction obligations | ​ | ​ | 2.3 | ​ | ​ | 3.9 | ​
Other | ​ |  | 19.6 | ​ |  | 22.9 | ​
Total | ​ | $ | 188.9 | ​ | $ | 241.3 | ​
Schedule of other long-term assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, |
Other Long-Term Assets (in millions) |  | 2023 |  | 2022 |
Vessel and equipment spare parts | ​ | $ | 14.2 | ​ | $ | 13.2 | ​
Pension plan assets | ​ | ​ | 34.8 | ​ | ​ | 18.9 | ​
Insurance related receivables | ​ | ​ | 10.2 | ​ | ​ | 12.1 | ​
Other | ​ | ​ | 7.2 | ​ | ​ | 9.4 | ​
Total | ​ | $ | 66.4 | ​ | $ | 53.6 | ​
Schedule of estimated useful lives of property and equipment | ​
​ | ​ | ​
Classification |  | Life
Vessels |  | 40 years
Terminal cranes |  | 30 years
Containers and chassis | ​ | 15 years
Terminal facilities and other property |  | 35 years
Schedule of other liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, |
Other Liabilities (in millions) |  | 2023 |  | 2022 |
Payroll and vacation |  | $ | 38.3 |  | $ | 34.7 | ​
Employee incentives and other benefits | ​ | ​ | 33.9 | ​ | ​ | 33.2 | ​
Insurance reserves and other related liabilities - short term | ​ | ​ | 17.5 | ​ | ​ | 15.6 | ​
Multi-employer withdrawal liabilities - short term | ​ | ​ | 4.1 | ​ | ​ | 4.1 | ​
Income tax and other tax related liabilities | ​ | ​ | 1.6 | ​ | ​ | 2.2 | ​
Other short-term liabilities | ​ | ​ | 12.6 | ​ | ​ | 15.7 | ​
Total |  | $ | 108.0 |  | $ | 105.5 | ​
Schedule of other long-term liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, |
Other Long-Term Liabilities (in millions) |  | 2023 |  | 2022 |
Multi-employer withdrawal liability | ​ | $ | 46.5 | ​ | $ | 48.6 | ​
Insurance reserves and other related liabilities | ​ | ​ | 23.8 | ​ | ​ | 29.8 | ​
Pension and post-retirement liabilities | ​ | ​ | 21.8 | ​ | ​ | 17.8 | ​
Other long-term liabilities | ​ |  | 21.6 | ​ |  | 18.6 | ​
Total | ​ | $ | 113.7 | ​ | $ | 114.8 | ​
Ocean Transportation |
Schedule of principal revenue generating activities by segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
Ocean Transportation (in millions) (1) | ​ | 2023 | ​ | 2022 | ​ | 2021
Ocean Transportation services | ​ | $ | 2,420.8 | ​ | $ | 3,508.0 | ​ | $ | 3,101.9
Terminal and other related services | ​ | ​ | 36.9 | ​ | ​ | 18.5 | ​ | ​ | 16.0
Fuel sales | ​ | ​ | 12.3 | ​ | ​ | 11.3 | ​ | ​ | 7.2
Vessel management and related services | ​ | ​ | 7.0 | ​ | ​ | 6.8 | ​ | ​ | 7.7
Total | ​ | $ | 2,477.0 | ​ | $ | 3,544.6 | ​ | $ | 3,132.8
(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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31,
Logistics (in millions) (1) | ​ | 2023 | ​ | 2022 | ​ | 2021
Transportation Brokerage and Freight Forwarding services | ​ | $ | 546.8 | ​ | $ | 695.1 | ​ | $ | 707.4
Warehousing and distribution services | ​ | ​ | 42.5 | ​ | ​ | 53.5 | ​ | ​ | 44.7
Supply chain management and other services | ​ |  | 28.3 | ​ |  | 49.8 | ​ |  | 40.4
Total | ​ | $ | 617.6 | ​ | $ | 798.4 | ​ | $ | 792.5
(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 and other services revenue categories which are denominated in foreign currencies.
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