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CAPITAL CONSTRUCTION FUND - Summary of the activities of the CCF cash and cash equivalents, and investments account (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
CCF Cash and Cash Equivalents: |  |
CCF cash and cash equivalents balance at beginning of period | $ 599.4 | $ 518.2
Cash deposits into the CCF | 50.0 | 100.0
Cash paid for purchase of U.S. Treasury debt securities and accrued interest | (449.8) |
Proceeds from U.S. Treasury debt securities at maturity | 48.1 |
Interest income deposited into the CCF | 18.8 | 31.1
Repurchase of assigned accounts receivable | 53.8 |
Qualifying withdrawal payments out of the CCF | (89.6) | (49.9)
Total CCF cash and cash equivalents balance at end of period | 230.7 | 599.4
CCF Investments: |  |
Purchase of U.S. Treasury debt securities | 448.1 |
Withdrawals of U.S. Treasury debt securities at maturity | (48.1) |
Accretion of investments | 11.9 |
Total CCF investments balance at end of period | 411.9 |
Cash and cash equivalents, and investments account | $ 642.6 | $ 599.4

X
- Definition The amount of accretion of investments made under capital construction fund. + References No definition available. + Details
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Balance Type: | debit
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- Definition The balance of cash in capital construction fund. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition The carrying value of cash and cash equivalents and investments in capital construction fund. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The amount of cash deposits into capital construction fund. + References No definition available. + Details
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Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition The amount of interest on deposits and investments in capital construction fund. + References No definition available. + Details
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- Definition Cost of capital construction fund investments maturing maturing in third fiscal year following current fiscal year. + References No definition available. + Details
Name: | matx_CapitalConstructionFundInvestments
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- References No definition available. + Details
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- Definition The amount of cash paid for purchase for investments along with accrued interest from capital construction fund. + References No definition available. + Details
Name: | matx_CapitalConstructionFundPaymentForPurchaseOfInvestmentsAlongWithAccruedInterest
Namespace Prefix: | matx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The amount of increase in capital construction fund due to cash inflow from investments at maturity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Purchase of investments under capital construction fund. + References No definition available. + Details
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- Definition Amount of decrease in capital construction fund due to withdrawal of investment at maturity. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition The amount of decrease in capital construction fund cash and cash equivalents due to qualifying withdrawal payments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition The amount of increase in capital construction fund cash and cash equivalents due to repurchase of assigned accounts receivable. + References No definition available. + Details
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