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GENERAL AND SIGNIFICANT ACCOUNTING POLICIES - PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Prepaid Expenses and Other Assets:
Vessel fuel	$ 31.0	$ 31.2
Prepaid insurance and insurance related receivables	19.6	19.1
Prepaid operating expenses	12.1	8.8
Other prepaid expenses	10.9	9.9
Other assets	2.7	4.9
Total	$ 76.3	$ 73.9

X

- Definition

Amount of asset related to consideration paid in advance for fuel that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The carrying balance as on the balance sheet date of prepaid operating expenses.

+ References

No definition available.

+ Details

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Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of current assets classified as other.

+ References

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-Topic 852
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- Definition

Amount of asset related to consideration paid in advance for other costs that provide economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

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-Topic 210
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-Section S99
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- References

No definition available.

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- Definition

Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

+ References

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- Definition

Amount of asset related to consideration paid in advance for insurance that provides economic benefits within a future period of one year or the normal operating cycle, if longer.

+ References

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+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant