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GOODWILL AND INTANGIBLE ASSETS - INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Finite-lived Intangible Assets |  |  |
Gross Amount at the beginning of the year | $ 151.4 | $ 10.4 |
Additions |  | 1.0 |
Gross Amount at the end of the year | 258.0 | 151.4 | $ 10.4
Accumulated Amortization | (21.4) | (12.3) |
Net Amount | 236.6 | 139.1 |
Aggregate intangible asset amortization | 9.1 | 4.4 | 1.3
Estimated amortization expenses related to intangibles |  |  |
2017 | 11.3 |  |
2018 | 11.2 |  |
2019 | 11.0 |  |
2020 | 11.0 |  |
2021 | 10.9 |  |
Thereafter | 153.9 |  |
Net Amount | 209.3 |  |
Horizon |  |  |
Finite-lived Intangible Assets |  |  |
Additions |  | 140.0 |
Span Alaska |  |  |
Finite-lived Intangible Assets |  |  |
Additions | 106.6 |  |
Estimated amortization expenses related to intangibles |  |  |
Net Amount | 27.3 |  |
Span Alaska | Trade Names |  |  |
Finite-lived Intangible Assets |  |  |
Indefinite-Lived intangible asset acquired | 27.3 |  |
Indefinite-Lived intangible asset | 27.3 |  |
Customer Relationships. | Span Alaska |  |  |
Finite-lived Intangible Assets |  |  |
Finite-Lived intangible assets acquired | 79.3 |  |
Estimated amortization expenses related to intangibles |  |  |
Net Amount | $ 209.3 |  |
Expected useful life | 20 years |  |
Ocean Transportation |  |  |
Finite-lived Intangible Assets |  |  |
Gross Amount at the beginning of the year | $ 140.6 | 0.6 |
Gross Amount at the end of the year | 140.6 | 140.6 | 0.6
Accumulated Amortization | (11.0) | (4.2) |
Net Amount | 129.6 | 136.4 |
Ocean Transportation | Horizon |  |  |
Finite-lived Intangible Assets |  |  |
Additions |  | 140.0 |
Ocean Transportation | Customer Relationships. | Horizon |  |  |
Finite-lived Intangible Assets |  |  |
Finite-Lived intangible assets acquired |  | $ 140.0 |
Estimated amortization expenses related to intangibles |  |  |
Expected useful life |  | 21 years |
Logistics |  |  |
Finite-lived Intangible Assets |  |  |
Gross Amount at the beginning of the year | 10.8 | $ 9.8 |
Additions |  | 1.0 |
Gross Amount at the end of the year | 117.4 | 10.8 | $ 9.8
Accumulated Amortization | (10.4) | (8.1) |
Net Amount | 107.0 | $ 2.7 |
Logistics | Span Alaska |  |  |
Finite-lived Intangible Assets |  |  |
Additions | $ 106.6 |  |

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