PENSION AND POST-RETIREMENT PLANS - MULTI-EMPLOYER DEFINED BENEFIT PLANS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Multiemployer Plans
Estimated benefit plan withdrawal obligations	$ 182.1
Pension Benefits | Hawaii Longshore Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	12.1	$ 11.9	$ 11.1
Multiemployer Health and Benefit Plans
Multiemployer Plans
Contributions of Matson	37.7	37.7	34.7
Multi-employer defined contribution pension plans
Multiemployer Plans
Contributions of Matson	$ 32.7	33.8	31.0
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	$ 1.0	1.1	1.1
Multi-employer defined contribution pension plans | Master Mates And Pilots Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	3.6	3.8	3.5
Multi-employer defined contribution pension plans | Masters, Mates and Pilots Adjustable Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	2.0	2.1	2.0
Multi-employer defined contribution pension plans | MEBA Pension Trust - Defined Benefit Plan | Green Zone
Multiemployer Plans
Contributions of Matson	4.2	4.5	4.3
Multi-employer defined contribution pension plans | OCU Pension Trust Plan | Green Zone
Multiemployer Plans
Contributions of Matson	0.4	0.5	0.3
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	1.3	1.5	1.4
Multi-employer defined contribution pension plans | Alaska Teamster - Employer Pension Plan | Red Zone
Multiemployer Plans
Contributions of Matson	3.9	4.0	3.6
Multi-employer defined contribution pension plans | All Alaska Longshore Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	1.8	2.0	1.6
Multi-employer defined contribution pension plans | Western Conference of Teamsters Pension Plan | Green Zone
Multiemployer Plans
Contributions of Matson	2.1	2.1	1.9
Multi-employer defined contribution pension plans | Western Conference Of Teamsters Supplemental Benefit Trust | Green Zone
Multiemployer Plans
Contributions of Matson	0.1	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