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PENSION AND POST-RETIREMENT PLANS - MULTI-EMPLOYER DEFINED BENEFIT PLANS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2012
Multiemployer Plans |  |  |  |
Multiemployer Plans, Accumulated Benefit Obligation | $ 220.8 |  |  |
Benefit plan withdrawal obligation | 64.2 |  |  |
Minimum |  |  |  |
Multiemployer Plans |  |  |  |
Employer matching contribution to MEBA Pension Trust (as a percent) |  |  |  | 11.70%
Multiemployer Benefit Pension Plans |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | $ 22.7 | $ 17.8 | $ 13.1 |
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 | Hawaii Terminals Multiemployer Pension Plan | Yellow Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | $ 5.3 | 4.9 | 5.1 |
Multiemployer Benefit Pension Plans | Hawaii Stevedoring Multiemployer Retirement Plan | Yellow Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 3.5 | 2.8 | 2.9 |
Multiemployer Benefit Pension Plans | Master Mates And Pilots Pension Plan | Green Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 3.1 | 2.2 | 1.9 |
Multiemployer Benefit Pension Plans | Masters, Mates and Pilots Adjustable Pension Plan |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 1.8 | 1.7 | 1.0 |
Multiemployer Benefit Pension Plans | O C U Trust Pension Plan | Green Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 0.2 | 0.1 | 0.1 |
Multiemployer Benefit Pension Plans | SIU Pacific District Pension Plan | Green Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 0.6 |  |  |
Multiemployer Benefit Pension Plans | Alaska Teamster - Employer Pension Plan | Red Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 2.6 | 1.5 |  |
Multiemployer Benefit Pension Plans | All Alaska Longshore Pension Plan | Green Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 0.1 | 0.5 |  |
Multiemployer Benefit Pension Plans | Western Conference of Teamsters Pension Plan | Green Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 1.3 | 0.8 |  |
Multiemployer Benefit Pension Plans | O P E I U Local 153 Pension Plan | Red Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 0.1 | 0.1 |  |
Multiemployer Health and Benefit Plans |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 22.5 | 18.1 | 11.1 |
Multiemployer Health and Benefit Plans | Stevedore Industry Committee Welfare Benefit Plan |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 4.9 | 3.8 | 3.1 |
Multiemployer Health and Benefit Plans | O C U Health and Welfare Trust |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 0.3 | 0.2 | 0.2 |
Multiemployer Health and Benefit Plans | S U P Welfare Plan, Inc. |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 3.1 | 2.9 | 2.7 |
Multiemployer Health and Benefit Plans | M E B A Medical and Benefits Plan |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 2.9 | 2.2 | 1.8 |
Multiemployer Health and Benefit Plans | M F O W Welfare Fund |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 1.4 | 1.3 | 1.2 |
Multiemployer Health and Benefit Plans | A R A Pension and Welfare Plan |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 0.7 | 0.5 | 0.5 |
Multiemployer Health and Benefit Plans | Masters, Mates and Pilots Health and Benefit Plan |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 2.9 | 2.3 | 1.6 |
Multiemployer Health and Benefit Plans | Seafarers Health and Benefits Plan |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 3.1 | 1.8 |  |
Multiemployer Health and Benefit Plans | Alaska Teamster - Employer Welfare Trust |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 2.0 | 1.2 |  |
Multiemployer Health and Benefit Plans | All Alaska Longshore Health and Welfare Trust Fund |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 0.2 | 1.3 |  |
Multiemployer Health and Benefit Plans | Western Teamsters Welfare Trust |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | 1.0 | 0.6 |  |
Multi-employer defined contribution pension plans | M E B A Pension Trust - Defined Benefit Plan | Red Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson |  | $ 3.2 |  |
Multi-employer defined contribution pension plans | M E B A Pension Trust - Defined Benefit Plan | Green Zone |  |  |  |
Multiemployer Plans |  |  |  |
Contributions of Matson | $ 4.1 |  | $ 2.1 |

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