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GOODWILL AND INTANGIBLE ASSETS - INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Intangible assets |  |  |
Gross Amount | $ 258.0 | $ 258.0 |
Accumulated Amortization | (44.0) | (32.8) |
Net Amount | 214.0 | 225.2 |
Aggregate intangible asset amortization | 11.2 | 11.4 | $ 9.1
Estimated amortization expenses related to intangibles |  |  |
2019 | 11.0 |  |
2020 | 11.0 |  |
2021 | 10.9 |  |
2022 | 10.7 |  |
2023 | 10.7 |  |
Thereafter | 132.4 |  |
Net Amount | 186.7 |  |
Ocean Transportation | Customer Relationships. |  |  |
Intangible assets |  |  |
Gross Amount | 140.6 | 140.6 |
Accumulated Amortization | (24.4) | (17.8) |
Net Amount | $ 116.2 | 122.8 |
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 | (19.6) | (15.0) |
Net Amount | 97.8 | 102.4 |
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 | (19.6) | (15.0) |
Net Amount | 70.5 | $ 75.1 |
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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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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