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RETIREMENT PLANS - SERP (Details) - Supplemental Retirement Plan ('SERP') - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
RETIREMENT PLANS |  |  |  |  |
Fair value of plan assets | $ 32.7 |  | $ 32.7 |  | $ 30.7
Trading gains (losses), net | 1.1 | $ 1.0 | 1.9 | $ 2.7 |
Defined benefit plan | 24.1 |  | 24.1 |  | $ 24.5
Selling, general and administrative expenses |  |  |  |  |
RETIREMENT PLANS |  |  |  |  |
Unrealized gains (loss) | $ 1.1 | $ 1.1 | $ 2.0 | $ 2.8 |

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