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GOODWILL AND INTANGIBLE ASSETS - INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Intangible assets |  |  |
Gross Amount | $ 258.0 | $ 258.0 |
Accumulated Amortization | (55.1) | (44.0) |
Net Amount | 202.9 | 214.0 |
Aggregate intangible asset amortization | 11.1 | 11.2 | $ 11.4
Estimated amortization expenses related to intangibles |  |  |
2020 | 11.0 |  |
2021 | 10.9 |  |
2022 | 10.7 |  |
2023 | 10.7 |  |
2024 | 10.7 |  |
Thereafter | 121.6 |  |
Net Amount | 175.6 |  |
Ocean Transportation | Customer Relationships. |  |  |
Intangible assets |  |  |
Gross Amount | 140.6 | 140.6 |
Accumulated Amortization | (31.2) | (24.4) |
Net Amount | $ 109.4 | 116.2 |
Ocean Transportation | Customer Relationships. | Horizon |  |  |
Intangible assets |  |  |
Expected useful life | 21 years |  |
Finite-Lived intangible assets acquired | $ 140.6 |  |
Logistics |  |  |
Intangible assets |  |  |
Gross Amount | 117.4 | 117.4 |
Accumulated Amortization | (23.9) | (19.6) |
Net Amount | 93.5 | 97.8 |
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 | 90.1 | 90.1 |
Accumulated Amortization | (23.9) | (19.6) |
Net Amount | 66.2 | $ 70.5 |
Net Remaining Amount | $ 10.8 |  |
Expected useful life | 13 years |  |
Logistics | Customer Relationships. | Span Alaska |  |  |
Intangible assets |  |  |
Net Amount | $ 79.3 |  |
Expected useful life | 20 years |  |

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