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SIGNIFICANT ACCOUNTING POLICIES - PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($) $ in Millions | Apr. 19, 2024 | Dec. 31, 2024 | Dec. 31, 2023
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Prepaid Expenses and Other Assets: |  |  |
Prepaid fuel |  | $ 31.2 | $ 22.5
Prepaid insurance and insurance related receivables |  | 19.1 | 19.3
Prepaid operating expenses |  | 8.8 | 8.2
Income tax receivables, net |  | 2.0 | 125.2
Restricted cash - vessel construction obligations |  |  | 2.3
Other |  | 12.8 | 11.4
Total |  | 73.9 | 188.9
Other Long-term Assets |  |  |
Pension plan assets |  | 49.0 | 34.8
Vessel and equipment spare parts |  | 15.9 | 14.2
Insurance related receivables |  | 9.8 | 10.2
Other |  | 4.9 | 7.2
Total |  | $ 79.6 | 66.4
Income taxes receivable |  |  | $ 118.6
Income tax refund | $ 118.6 |  |
Interest on income tax refund | $ 10.2 |  |

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