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EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS - Defined Contribution Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
EMPLOYEE RETIREMENT PLANS AND POSTRETIREMENT BENEFITS |  |  |
Percentage of matching contribution | 100.00% | 100.00% | 100.00%
Percentage of compensation | 3.00% | 3.00% | 3.00%
Percentage of additional match | 50.00% | 50.00% | 50.00%
Percentage of compensation on additional match | 2.00% | 2.00% | 2.00%
Defined contribution plan cost | $ 5.0 | $ 5.1 | $ 4.5
Net actuarial gains and other deferred items, net of related taxes | $ 10.6 | $ 11.4 |

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