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GOODWILL AND INTANGIBLE ASSETS - GOODWILL (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Changes in the Company's goodwill |  |
Balance at the beginning of the period | $ 241.6 | $ 27.4
Balance at the end of the period | 323.7 | 241.6
Ocean Transportation |  |
Changes in the Company's goodwill |  |
Balance at the beginning of the period | 215.0 | 0.8
Balance at the end of the period | 218.5 | 215.0
Logistics |  |
Changes in the Company's goodwill |  |
Balance at the beginning of the period | 26.6 | 26.6
Balance at the end of the period | 105.2 | 26.6
Span Alaska |  |
Changes in the Company's goodwill |  |
Additions | 78.6 |
Span Alaska | Logistics |  |
Changes in the Company's goodwill |  |
Additions | 78.6 |
Horizon |  |
Changes in the Company's goodwill |  |
Balance at the beginning of the period |  | 217.7
Additions | 3.5 | 214.2
Horizon | Ocean Transportation |  |
Changes in the Company's goodwill |  |
Additions | $ 3.5 | $ 214.2

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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