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PENSION, HEALTH CARE AND OTHER POSTRETIREMENT BENEFITS - Summary of the Fair Value of the Defined Benefit Pension Plan Assets (Details) - Defined Benefit Pension - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | $ 389.1 | $ 354.7 | $ 356.5
Total investments | 416.8 | 380.0 | 381.8
NAV |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Investments measured at NAV or its equivalent | 27.7 | 25.3 | 25.3
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 150.6 | 132.1 | 109.7
Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 238.5 | 222.6 | 246.8
Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 7.6 | 8.7 |
Cash and cash equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 7.6 | 8.7 |
Cash and cash equivalents | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 0.0 | 0.0 |
Equity investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 104.3 | 95.3 | 133.0
Equity investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 99.4 | 86.6 | 72.9
Equity investments | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 4.9 | 8.7 | 60.1
Fixed income investments |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 248.9 | 226.5 | 188.9
Fixed income investments | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 43.6 | 36.8 | 36.8
Fixed income investments | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 205.3 | 189.7 | 152.1
Other assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 28.3 | 24.2 | 34.6
Other assets | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | 0.0 | 0.0 | 0.0
Other assets | Significant Other Observable Inputs (Level 2) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments in fair value hierarchy | $ 28.3 | $ 24.2 | $ 34.6

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