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SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fiscal Year |  |  |
Fiscal period | 364 days | 364 days | 364 days
Cash and Cash Equivalents |  |  |
Outstanding checks in excess of funds on deposits | $ 18.9 us-gaap_BankOverdrafts | $ 19.8 us-gaap_BankOverdrafts |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 293.4 us-gaap_CashAndCashEquivalentsFairValueDisclosure | 114.5 us-gaap_CashAndCashEquivalentsFairValueDisclosure |
Accounts receivable, net | 197.6 us-gaap_ReceivablesFairValueDisclosure | 182.3 us-gaap_ReceivablesFairValueDisclosure |
Fixed rate debt | 395.7 us-gaap_LongTermDebtFairValue | 292.7 us-gaap_LongTermDebtFairValue |
Accounts Receivable |  |  |
Eligible accounts receivable assigned to the CCF | 150.7 matx_AccruedDepositsToCapitalConstructionFund | 112.0 matx_AccruedDepositsToCapitalConstructionFund |
Allowance for doubtful accounts |  |  |
Balance at Beginning of year | 4.1 us-gaap_AllowanceForDoubtfulAccountsReceivable | 4.7 us-gaap_AllowanceForDoubtfulAccountsReceivable | 5.3 us-gaap_AllowanceForDoubtfulAccountsReceivable
Expense | 1.8 us-gaap_ProvisionForDoubtfulAccounts | 0.6 us-gaap_ProvisionForDoubtfulAccounts | 0.7 us-gaap_ProvisionForDoubtfulAccounts
Write-offs and Other | (0.9)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | (1.2)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs | (1.3)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance at End of Year | 5.0 us-gaap_AllowanceForDoubtfulAccountsReceivable | 4.1 us-gaap_AllowanceForDoubtfulAccountsReceivable | 4.7 us-gaap_AllowanceForDoubtfulAccountsReceivable
Prepaid and Other Assets: |  |  |
Prepaid expenses and other assets includes diesel and heavy fuel oil expense that is primarily aboard the company's vessels | 11.0 us-gaap_PrepaidExpenseAndOtherAssets | 13.8 us-gaap_PrepaidExpenseAndOtherAssets |
Income tax receivable | 0 us-gaap_IncomeTaxReceivable | 14.2 us-gaap_IncomeTaxReceivable |
Other prepaid expenses | 9.5 us-gaap_PrepaidExpenseCurrentAndNoncurrent | 15.0 us-gaap_PrepaidExpenseCurrentAndNoncurrent |
Carrying value |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 293.4 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 114.5 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Accounts receivable, net | 197.6 us-gaap_ReceivablesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 182.3 us-gaap_ReceivablesFairValueDisclosure / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Fixed rate debt | 373.6 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 286.1 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember |
Total | Quoted Prices in Active Markets (Level 1) |  |  |
Fair value of financial instruments |  |  |
Cash and cash equivalents | 293.4 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 114.5 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Total | Significant Observable Inputs (Level 2) |  |  |
Fair value of financial instruments |  |  |
Accounts receivable, net | 197.6 us-gaap_ReceivablesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 182.3 us-gaap_ReceivablesFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |
Fixed rate debt | $ 395.7 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 292.7 us-gaap_LongTermDebtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember |

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