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GOODWILL AND INTANGIBLES (Tables) | 12 Months Ended
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Dec. 31, 2023
GOODWILL AND INTANGIBLES |
Schedule of goodwill | Goodwill by segment consists of the following as of December 31, 2023 and 2022:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Ocean | ​ | ​ | ​ | ​ | ​ | ​
(In millions) |  | Transportation |  | Logistics |  | Total
Goodwill | ​ | $ | 222.6 | ​ | $ | 105.2 | ​ | $ | 327.8
Schedule of intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2023 |  | ​ | As of December 31, 2022 |
​ | ​ | Gross | ​ | Accumulated | ​ | ​ | ​ |  | ​ | Gross | ​ | Accumulated | ​ | ​ | ​ |
(In millions) |  | Amount |  | Amortization |  | Net Book Value |  |  | Amount |  | Amortization |  | Net Book Value |
Ocean Transportation - Customer relationships | ​ | $ | 140.6 | ​ | $ | 57.9 | ​ | $ | 82.7 | ​ | ​ | $ | 140.6 | ​ | $ | 51.2 | ​ | $ | 89.4 | ​
Logistics: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer relationships | ​ | ​ | 110.4 | ​ | ​ | 44.0 | ​ | ​ | 66.4 | ​ | ​ | ​ | 95.3 | ​ | ​ | 37.1 | ​ | ​ | 58.2 | ​
Trade name | ​ |  | 27.3 | ​ | ​ | — | ​ | ​ | 27.3 | ​ | ​ |  | 27.3 | ​ | ​ | — | ​ | ​ | 27.3 | ​
Total Logistics | ​ |  | 137.7 | ​ | ​ | 44.0 | ​ | ​ | 93.7 | ​ | ​ |  | 122.6 | ​ | ​ | 37.1 | ​ | ​ | 85.5 | ​
Total | ​ | $ | 278.3 | ​ | $ | 101.9 | ​ | $ | 176.4 | ​ | ​ | $ | 263.2 | ​ | $ | 88.3 | ​ | $ | 174.9 | ​
Schedule of intangible asset related amortization expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years Ended December 31, |
(In millions) |  | 2023 |  | 2022 |  | 2021 |
Amortization expense | ​ | $ | 13.6 | ​ | $ | 11.4 | ​ | $ | 10.9 | ​
Schedule of estimated amortization expenses related to intangible assets | As of December 31, 2023, estimated amortization expense related to customer relationship intangible assets during the next five years and thereafter are as follows:
​ | ​ | ​ | ​ | ​
​ | ​ | Customer | ​
Year (in millions) | ​ | Relationships |
2024 | ​ | $ | 14.3 | ​
2025 | ​ |  | 13.6 | ​
2026 | ​ |  | 13.0 | ​
2027 | ​ |  | 13.0 | ​
2028 | ​ |  | 13.0 | ​
Thereafter | ​ |  | 82.2 | ​
Total | ​ | $ | 149.1 | ​
​

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