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RETIREMENT PLANS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Other Postretirement Benefits Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Contributions | $ 6.5 | $ 10.5 | $ 13.6 | $ 14.1 |
Expected contributions | 14.7 |  | 14.7 |  | $ 16.6
Pension Plan |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |
Contributions | $ 6.2 | $ 11.0 | $ 19.0 | $ 33.4 |

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