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SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Intangible asset |  |  |
Impairment on long lived intangible assets |  |  | $ 2.1 us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Impairments of goodwill | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss | 0 us-gaap_GoodwillImpairmentLoss
CCF Deposits and Other Long-term Assets |  |  |
CCF Deposits, Capital Construction Fund Deposits | 27.5 matx_NetBalanceOfAmountsAccruedForCapitalConstructionFund | 0 matx_NetBalanceOfAmountsAccruedForCapitalConstructionFund |
Other assets and deferred charges | 21.8 us-gaap_OtherAssetsMiscellaneous | 18.3 us-gaap_OtherAssetsMiscellaneous |
Comprehensive Income (Loss): |  |  |
Other comprehensive income (loss) net of tax (expense) benefit | (29.8)us-gaap_OtherComprehensiveIncomeLossNetOfTax | 22.0 us-gaap_OtherComprehensiveIncomeLossNetOfTax | (0.5)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Accumulated other comprehensive loss | (53.3)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax | (23.5)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Amortization of deferred pension, post-retirement costs and non-qualified plans | $ 52.9 matx_AccumulatedOtherComprehensiveIncomeLossAmortizationOfDeferredPensionPostRetirementCostsAndNonQualifiedPlans | $ 22.6 matx_AccumulatedOtherComprehensiveIncomeLossAmortizationOfDeferredPensionPostRetirementCostsAndNonQualifiedPlans |
Customer lists and other | Minimum |  |  |
Intangible asset |  |  |
Expected useful lives | 3 years |  |
Customer lists and other | Maximum |  |  |
Intangible asset |  |  |
Expected useful lives | 13 years |  |

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- Definition Represents the amount of amortization of deferred pension, post-retirement costs and non-qualified plans. + References No definition available. + Details
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- Definition The net balance of amount accrued for withdrawal and deposits to the Capital Construction Fund, reflected in the consolidated balance sheets. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of loss from the write-down of an asset representing the 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 + Details
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