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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

X

- 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

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X

- 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

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- Definition

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+ References

No definition available.

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