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BENEFIT PLANS - Fair Values of Pension Plan Assets (Details) - Pension Plans, Defined Benefit - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | $ 607.1 | $ 647.9 | $ 637.8
Level 1, Level 2, and Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 590.2 | 634.9 |
Level 1, Level 2, and Level 3 | Debt funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 590.2 | 634.9 |
Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.0 | 0.0 |
Level 1 | Debt funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.0 | 0.0 |
Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 590.2 | 634.9 |
Level 2 | Debt funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 590.2 | 634.9 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.0 | 0.0 |
Level 3 | Debt funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 0.0 | 0.0 |
Fair Value Measured at Net Asset Value Per Share | Interest in common/collective trusts (at NAV) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | 13.1 | 9.3 |
Fair Value Measured at Net Asset Value Per Share | Private partnerships (at NAV) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total pension plan assets | $ 3.8 | $ 3.7 |

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