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GOODWILL AND INTANGIBLES - FINITE-LIVED INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024
Finite-Lived Intangible Assets |  |
Period of amortization | 5 years |
Amortization to be recorded as a decrease to operating revenues |  |
Amortization to be recorded in the next five years |  |
2025 | $ 57.9 |
2026 | 59.9 |
2027 | 59.9 |
2028 | 59.9 |
2029 | 59.9 |
Maple Flats | Amortization to be recorded as a decrease to operating revenues |  |
Amortization to be recorded in the next five years |  |
2025 | 1.3 |
2026 | 1.3 |
2027 | 1.3 |
2028 | 1.3 |
2029 | 1.3 |
PPAs | Maple Flats |  |
Finite-Lived Intangible Assets |  |
Gross carrying amount | $ 18.8 | $ 13.0
Weighted average remaining useful life | 15 years |
Period of amortization | 5 years |

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