XML 99 R78.htm IDEA: XBRL DOCUMENT v3.22.4

PENSION AND POST-RETIREMENT PLANS - MULTI-EMPLOYER DEFINED BENEFIT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Multiemployer Plans
Estimated benefit plan withdrawal obligations	$ 170.1
Pension Benefits | Hawaii Longshore Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	11.9	$ 11.1
Multiemployer Health and Benefit Plans
Multiemployer Plans
Contributions of Matson	37.7	34.7	$ 32.5
Multi-employer defined contribution pension plans
Multiemployer Plans
Contributions of Matson	$ 33.8	31.0	28.4
Multi-employer defined contribution pension plans | Orange Zone
Multiemployer Plans
Expected funding deficiency period	6 years
Multi-employer defined contribution pension plans | Minimum | Green Zone
Multiemployer Plans
Funded status of multiemployer plan (as a percent)	80.00%
Multi-employer defined contribution pension plans | Maximum | Red Zone
Multiemployer Plans
Funded status of multiemployer plan (as a percent)	65.00%
Multi-employer defined contribution pension plans | Maximum | Yellow Zone
Multiemployer Plans
Funded status of multiemployer plan (as a percent)	80.00%
Multi-employer defined contribution pension plans | Maximum | Orange Zone
Multiemployer Plans
Funded status of multiemployer plan (as a percent)	80.00%
Multi-employer defined contribution pension plans | American Radio Association Pension Fund | Green Zone
Multiemployer Plans
Contributions of Matson	$ 1.1	1.1	1.0
Multi-employer defined contribution pension plans | Hawaii Terminals Multiemployer Pension Plan | Yellow Zone
Multiemployer Plans
Contributions of Matson			5.8
Multi-employer defined contribution pension plans | Hawaii Stevedoring Multiemployer Retirement Plan | Green Zone
Multiemployer Plans
Contributions of Matson			4.6
Multi-employer defined contribution pension plans | Master Mates And Pilots Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	3.8	3.5	3.2
Multi-employer defined contribution pension plans | Masters, Mates and Pilots Adjustable Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	2.1	2.0	1.8
Multi-employer defined contribution pension plans | MEBA Pension Trust - Defined Benefit Plan | Green Zone
Multiemployer Plans
Contributions of Matson	4.5	4.3	4.1
Multi-employer defined contribution pension plans | OCU Pension Trust Plan | Green Zone
Multiemployer Plans
Contributions of Matson	0.5	0.3	0.2
Multi-employer defined contribution pension plans | MFOW Supplementary Pension Plan | Yellow Zone
Multiemployer Plans
Contributions of Matson	0.1	0.1	0.1
Multi-employer defined contribution pension plans | SIU Pacific District Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	1.5	1.4	1.3
Multi-employer defined contribution pension plans | Alaska Teamster - Employer Pension Plan | Red Zone
Multiemployer Plans
Contributions of Matson	4.0	3.6	3.3
Multi-employer defined contribution pension plans | All Alaska Longshore Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	2.0	1.6	1.3
Multi-employer defined contribution pension plans | Western Conference of Teamsters Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	2.1	1.9	1.6
Multi-employer defined contribution pension plans | Western Conference Of Teamsters Supplemental Benefit Trust | Green Zone
Multiemployer Plans
Contributions of Matson	0.1
Multi-employer defined contribution pension plans | OPEIU Local 153 Pension Plan | Red Zone
Multiemployer Plans
Contributions of Matson	$ 0.1	$ 0.1	$ 0.1

X

- Definition

Expected funding deficiency period for determining zone status.

+ References

No definition available.

+ Details

Name:	matx_MultiEmployerPlanExpectedFundingDeficiencyPeriod
Namespace Prefix:	matx_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of contributions made to multiemployer plan by employer.

+ References

No definition available.

+ Details

Name:	matx_MultiemployerPlanContributionByEmployer
Namespace Prefix:	matx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the funded status of a multiemployer plan.

+ References

No definition available.

+ Details

Name:	matx_MultiemployerPlanFundedPercentage
Namespace Prefix:	matx_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of accumulated benefit obligation for multiemployer pension plan determined to be individually insignificant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 7
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=65877416&loc=SL14450678-114947

+ Details

Name:	us-gaap_MultiemployerPlanPensionInsignificantAccumulatedBenefitObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_MultiemployerPlansLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_HawaiiLongshorePensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=matx_GreenZoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=matx_MultiemployerPlansHealthAndBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanTypeAxis=matx_MultiemployerPlansDefinedContributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=matx_OrangezoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=matx_RedZoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=matx_YellowZoneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_AmericanRadioAssociationPensionFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_HawaiiTerminalsMultiemployerPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_HawaiiStevedoringMultiemployerRetirementPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_MasterMatesAndPilotsPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_MasterMatesAndPilotsAdjustablePensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_MEBAPensionTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_OCUTrustPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_MFOWSupplementaryPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_SiuPacificDistrictPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_AlaskaTeamsterEmployerPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_AllAlaskaLongshorePensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_WesternConferenceOfTeamstersPensionPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_WesternConferenceOfTeamstersSupplementalBenefitTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=matx_OPEIULocal153PensionFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: