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PENSION AND POST-RETIREMENT PLANS - MULTI-EMPLOYER DEFINED BENEFIT PLANS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Multiemployer Plans |  |  |
Multiemployer Plans, Accumulated Benefit Obligation | $ 266.7 |  |
Multiemployer Benefit Pension Plans |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | $ 27.3 | $ 25.5 | $ 24.4
Multiemployer Benefit Pension Plans | Orange Zone |  |  |
Multiemployer Plans |  |  |
Expected funding deficiency period | 6 years |  |
Multiemployer Benefit Pension Plans | Minimum | Green Zone |  |  |
Multiemployer Plans |  |  |
Funded status of multiemployer plan (as a percent) | 80.00% |  |
Multiemployer Benefit Pension Plans | Maximum | Red Zone |  |  |
Multiemployer Plans |  |  |
Funded status of multiemployer plan (as a percent) | 65.00% |  |
Multiemployer Benefit Pension Plans | Maximum | Yellow Zone |  |  |
Multiemployer Plans |  |  |
Funded status of multiemployer plan (as a percent) | 80.00% |  |
Multiemployer Benefit Pension Plans | Maximum | Orange Zone |  |  |
Multiemployer Plans |  |  |
Funded status of multiemployer plan (as a percent) | 80.00% |  |
Multiemployer Benefit Pension Plans | American Radio Association Pension Fund | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | $ 1.1 | 1.0 | 1.0
Multiemployer Benefit Pension Plans | Hawaii Terminals Multiemployer Pension Plan | Orange Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 5.7 | 5.7 | 5.7
Multiemployer Benefit Pension Plans | Hawaii Stevedoring Multiemployer Retirement Plan | Yellow Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 4.4 | 4.3 | 3.8
Multiemployer Benefit Pension Plans | Master Mates And Pilots Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 3.4 | 3.0 | 3.0
Multiemployer Benefit Pension Plans | Masters, Mates and Pilots Adjustable Pension Plan |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 1.9 | 1.7 | 1.7
Multiemployer Benefit Pension Plans | O C U Trust Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 0.2 | 0.2 | 0.2
Multiemployer Benefit Pension Plans | M F O W Supplementary Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 0.1 |  |
Multiemployer Benefit Pension Plans | SIU Pacific District Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 1.5 | 1.2 | 0.7
Multiemployer Benefit Pension Plans | Alaska Teamster - Employer Pension Plan | Red Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 1.9 | 1.9 | 2.4
Multiemployer Benefit Pension Plans | All Alaska Longshore Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 1.2 | 1.0 | 0.1
Multiemployer Benefit Pension Plans | Western Conference of Teamsters Pension Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 1.5 | 1.4 | 1.3
Multiemployer Benefit Pension Plans | O P E I U Local 153 Pension Plan | Red Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 0.1 | 0.1 | 0.1
Multiemployer Benefit Postretirement Plans |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | 32.8 | 30.0 | 27.0
Multi-employer defined contribution pension plans | M E B A Pension Trust - Defined Benefit Plan | Green Zone |  |  |
Multiemployer Plans |  |  |
Contributions of Matson | $ 4.3 | $ 4.0 | $ 4.4

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