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GOODWILL AND INTANGIBLES - INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Intangible assets |  |  |  |
Gross Amount |  | $ 278.3 | $ 263.2 |
Total Intangible Assets, net |  | 176.4 | 174.9 |
Aggregate intangible asset amortization |  | 13.6 | 11.4 | $ 10.9
Less: Accumulated Amortization |  | (101.9) | (88.3) |
Total estimated amortization expense related to intangibles |  | 149.1 |  |
Estimated amortization expenses related to intangibles |  |  |  |
2024 |  | 14.3 |  |
2025 |  | 13.6 |  |
2026 |  | 13.0 |  |
2027 |  | 13.0 |  |
2028 |  | 13.0 |  |
Thereafter |  | 82.2 |  |
Total estimated amortization expense related to intangibles |  | $ 149.1 |  |
Customer Relationships | Maximum |  |  |  |
Intangible assets |  |  |  |
Expected useful life |  | 21 years |  |
Ocean Transportation | Customer Relationships |  |  |  |
Intangible assets |  |  |  |
Gross Amount |  | $ 140.6 | 140.6 |
Total Intangible Assets, net |  | 82.7 | 89.4 |
Less: Accumulated Amortization |  | $ (57.9) | (51.2) |
Ocean Transportation | Customer Relationships | Horizon |  |  |  |
Intangible assets |  |  |  |
Expected useful life |  | 21 years |  |
Finite-Lived intangible assets acquired |  | $ 140.6 |  |
Logistics |  |  |  |
Intangible assets |  |  |  |
Gross Amount |  | 137.7 | 122.6 |
Total Intangible Assets, net |  | 93.7 | 85.5 |
Less: Accumulated Amortization |  | (44.0) | (37.1) |
Logistics | Trade Names |  |  |  |
Intangible assets |  |  |  |
Indefinite-Lived intangible asset |  | 27.3 | 27.3 |
Logistics | Span Alaska | Trade Names |  |  |  |
Intangible assets |  |  |  |
Indefinite-Lived intangible asset acquired |  | 27.3 |  |
Logistics | Customer Relationships |  |  |  |
Intangible assets |  |  |  |
Gross Amount |  | 110.4 | 95.3 |
Total Intangible Assets, net |  | 66.4 | 58.2 |
Expected useful life | 7 years |  |  |
Finite-Lived intangible assets acquired | $ 16.5 |  |  |
Less: Accumulated Amortization |  | $ (44.0) | $ (37.1) |
Logistics | Customer Relationships | Minimum |  |  |  |
Intangible assets |  |  |  |
Expected useful life |  | 3 years |  |
Logistics | Customer Relationships | Maximum |  |  |  |
Intangible assets |  |  |  |
Expected useful life |  | 13 years |  |
Logistics | Customer Relationships | Span Alaska |  |  |  |
Intangible assets |  |  |  |
Total Intangible Assets, net |  | $ 79.3 |  |
Expected useful life |  | 20 years |  |

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