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SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loss from discontinued operations
Loss from discontinued operations (net of tax)	$ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ (6.1)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
CLX2 Service
Loss from discontinued operations
Expenses			(4.4)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = matx_Clx2ServiceMember
Tax expense			1.6us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = matx_Clx2ServiceMember
Alexander & Baldwin
Loss from discontinued operations
Income			116.4us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember
Expenses			(118.1)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember
Tax expense			(1.6)us-gaap_DiscontinuedOperationTaxEffectOfDiscontinuedOperation / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember
Loss from A&B			$ (3.3)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingIncomeLoss / dei_LegalEntityAxis = matx_AlexanderAndBaldwinIncMember

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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