REPORTABLE SEGMENTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015 segment	Mar. 31, 2014
Segment results
Number of segments	2us-gaap_NumberOfReportableSegments
Revenue	$ 398.2us-gaap_SalesRevenueNet	$ 392.5us-gaap_SalesRevenueNet
Operating Income	44.9us-gaap_OperatingIncomeLoss	9.9us-gaap_OperatingIncomeLoss
Interest expense, net	(4.3)us-gaap_InterestExpense	(4.1)us-gaap_InterestExpense
Income before income taxes	40.6	5.8
Income tax expense	(15.6)us-gaap_IncomeTaxExpenseBenefit	(2.4)us-gaap_IncomeTaxExpenseBenefit
Net Income	25.0us-gaap_NetIncomeLoss	3.4us-gaap_NetIncomeLoss
Ocean Transportation
Segment results
Revenue	305.5	294.6
Operating Income	43.9	9.4
Logistics
Segment results
Revenue	92.7	97.9
Operating Income	$ 1.0	$ 0.5

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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