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PENSION AND POST-RETIREMENT PLANS - MULTI-EMPLOYER DEFINED BENEFIT PLANS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Multiemployer Plans |  |  |
Estimated benefit plan withdrawal obligations | $ 202.9 |  |
Pension Benefits | Hawaii Longshore Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 11.1 |  |
Multiemployer Health and Benefit Plans |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 34.7 | $ 32.5 | $ 32.8
Multi-employer defined contribution pension plans |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | $ 31.0 | 28.4 | 27.3
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 | 1.0 | 1.1
Multi-employer defined contribution pension plans | Hawaii Terminals Multiemployer Pension Plan | Yellow Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson |  | 5.8 | 5.7
Multi-employer defined contribution pension plans | Hawaii Stevedoring Multiemployer Retirement Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson |  | 4.6 | 4.4
Multi-employer defined contribution pension plans | Master Mates And Pilots Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 3.5 | 3.2 | 3.4
Multi-employer defined contribution pension plans | Masters, Mates and Pilots Adjustable Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 2.0 | 1.8 | 1.9
Multi-employer defined contribution pension plans | MEBA Pension Trust - Defined Benefit Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 4.3 | 4.1 | 4.3
Multi-employer defined contribution pension plans | OCU Pension Trust Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 0.3 | 0.2 | 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 | 1.4 | 1.3 | 1.5
Multi-employer defined contribution pension plans | Alaska Teamster - Employer Pension Plan | Red Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 3.6 | 3.3 | 1.9
Multi-employer defined contribution pension plans | All Alaska Longshore Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 1.6 | 1.3 | 1.2
Multi-employer defined contribution pension plans | Western Conference of Teamsters Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 1.9 | 1.6 | 1.5
Multi-employer defined contribution pension plans | OPEIU Local 153 Pension Plan | Red Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | $ 0.1 | $ 0.1 | $ 0.1

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