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GOODWILL AND INTANGIBLE ASSETS - INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Intangible assets |  |  |
Gross Amount | $ 263.2 | $ 258.0 |
Total Intangible Assets, net | 174.9 | 181.1 |
Aggregate intangible asset amortization | 11.4 | 10.9 | $ 10.9
Less: Accumulated Amortization | (88.3) | (76.9) |
Total estimated amortization expense related to intangibles | $ 147.6 |  |
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 | 89.4 | 96.0 |
Less: Accumulated Amortization | $ (51.2) | (44.6) |
Ocean Transportation | Customer Relationships | Horizon |  |  |
Intangible assets |  |  |
Expected useful life | 21 years |  |
Finite-Lived intangible assets acquired | $ 140.6 |  |
Logistics |  |  |
Intangible assets |  |  |
Gross Amount | 122.6 | 117.4 |
Total Intangible Assets, net | 85.5 | 85.1 |
Less: Accumulated Amortization | (37.1) | (32.3) |
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 | 95.3 | 90.1 |
Total Intangible Assets, net | 58.2 | 57.8 |
Net Remaining Amount | 16.0 |  |
Less: Accumulated Amortization | $ (37.1) | $ (32.3) |
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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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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