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SIGNIFICANT ACCOUNTING POLICIES AND OTHER FINANCIAL DATA - GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 1,602.0 | $ 1,602.0 |
Total intangible assets, gross | 440.0 | 440.0 |
Accumulated amortization | (148.0) | (122.0) |
Intangible Assets, Net (Excluding Goodwill), Total | 292.0 | 318.0 |
Intangible assets amortization expense | 26.0 | 26.0 | $ 26.0
Amortization recorded against revenues | 13.5 | 13.5 | $ 13.5
Expected amortization, year one | 26.0 |  |
Expected amortization, year two | 26.0 |  |
Expected amortization, year three | 26.0 |  |
Expected amortization, year four | 26.0 |  |
Expected amortization, year five | 26.0 |  |
Expected amortization expense, recorded against revenues, year one | 13.5 |  |
Expected amortization expense, recorded against revenues, year two | 13.5 |  |
Expected amortization expense, recorded against revenues, year three | 13.5 |  |
Expected amortization expense, recorded against revenues, year four | 13.5 |  |
Expected amortization expense, recorded against revenues, year five | 13.5 |  |
Renewable energy transmission and consumption permits |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross | 169.0 | 169.0 |
Accumulated amortization | $ (68.0) | (59.0) |
Renewable energy transmission and consumption permits | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 15 years |  |
Renewable energy transmission and consumption permits | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 19 years |  |
O&M agreement |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 23 years |  |
Intangible assets, gross | $ 66.0 | 66.0 |
Accumulated amortization | $ (20.0) | (17.0) |
ESJ PPA |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 14 years |  |
Intangible assets, gross | $ 190.0 | 190.0 |
Accumulated amortization | (51.0) | (37.0) |
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible assets, gross | 15.0 | 15.0 |
Accumulated amortization | $ (9.0) | $ (9.0) |
Other | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period | 10 years |  |

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