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BENEFIT PLANS - Fair Value of Postretirement Assets (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | $ 263.1 |
U.S. Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 34.2 |
International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 14.3 |
Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 193.0 |
Private Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 13.3 |
Real Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 4.5 |
Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 3.8 |
Other Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 9.8 | 10.7 | $ 10.7
Other Benefits | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 9.8 | 10.7 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Other Benefits | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 7.6 | 8.5 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Other Benefits | U.S. Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1.2 | 1.1 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Other Benefits | International Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.6 | 0.5 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Other Benefits | Fixed Income | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5.0 | 6.2 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Other Benefits | Private Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.4 | 0.4 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Other Benefits | Real Assets | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.1 | 0.2 |
Fair Value, Inputs, Level 1, Level 2, and Level 3 | Other Benefits | Cash | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.3 | 0.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 3.8 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Private Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Real Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 3.8 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Benefits | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.3 | 0.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Benefits | U.S. Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Benefits | International Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Benefits | Fixed Income | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Benefits | Private Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Benefits | Real Assets | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Benefits | Cash | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.3 | 0.1 |
Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 241.5 |
Significant Other Observable Inputs (Level 2) | U.S. Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 34.2 |
Significant Other Observable Inputs (Level 2) | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 14.3 |
Significant Other Observable Inputs (Level 2) | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 193.0 |
Significant Other Observable Inputs (Level 2) | Private Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Significant Other Observable Inputs (Level 2) | Real Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Significant Other Observable Inputs (Level 2) | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Significant Other Observable Inputs (Level 2) | Other Benefits | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 6.8 | 7.8 |
Significant Other Observable Inputs (Level 2) | Other Benefits | U.S. Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 1.2 | 1.1 |
Significant Other Observable Inputs (Level 2) | Other Benefits | International Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.6 | 0.5 |
Significant Other Observable Inputs (Level 2) | Other Benefits | Fixed Income | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 5.0 | 6.2 |
Significant Other Observable Inputs (Level 2) | Other Benefits | Private Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | Other Benefits | Real Assets | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) | Other Benefits | Cash | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 17.8 |
Significant Unobservable Inputs (Level 3) | U.S. Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Significant Unobservable Inputs (Level 3) | International Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Significant Unobservable Inputs (Level 3) | Fixed Income |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Significant Unobservable Inputs (Level 3) | Private Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 12.5 | 13.3 | 13.8
Significant Unobservable Inputs (Level 3) | Real Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 3.4 | 4.5 | $ 4.8
Significant Unobservable Inputs (Level 3) | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets |  | 0.0 |
Significant Unobservable Inputs (Level 3) | Other Benefits | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.5 | 0.6 |
Significant Unobservable Inputs (Level 3) | Other Benefits | U.S. Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Other Benefits | International Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Other Benefits | Fixed Income | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Significant Unobservable Inputs (Level 3) | Other Benefits | Private Equity | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.4 | 0.4 |
Significant Unobservable Inputs (Level 3) | Other Benefits | Real Assets | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.1 | 0.2 |
Significant Unobservable Inputs (Level 3) | Other Benefits | Cash | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Investments measured at net asset value | Other Benefits | Fair Value |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets | $ 2.2 | $ 2.2 |

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