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GOODWILL AND INTANGIBLES - INTANGIBLE LIABILITIES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Finite-Lived Intangible Liabilities |  |  |  |  |
Net carrying amount | $ 554.6 |  | $ 554.6 |  | $ 594.8
Amortization | 13.4 | $ 13.4 | $ 40.2 | $ 37.2 |
Period of amortization |  |  | 5 years |  |
Amortization to be recorded as an increase to operating revenues |  |  |  |  |
Amortization to be recorded in the next five years |  |  |  |  |
2024 | 53.4 |  | $ 53.4 |  |
2025 | 53.4 |  | 53.4 |  |
2026 | 53.4 |  | 53.4 |  |
2027 | 53.4 |  | 53.4 |  |
2028 | 53.4 |  | 53.4 |  |
Amortization to be recorded as a decrease to other operation and maintenance |  |  |  |  |
Amortization to be recorded in the next five years |  |  |  |  |
2024 | 0.2 |  | 0.2 |  |
2025 | 0.2 |  | 0.2 |  |
2026 | 0.2 |  | 0.2 |  |
2027 | 0.2 |  | 0.2 |  |
2028 | 0.2 |  | 0.2 |  |
WECI |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Gross carrying amount | 665.8 |  | 665.8 |  | 665.8
Accumulated amortization | (111.2) |  | (111.2) |  | (71.0)
Net carrying amount | 554.6 |  | 554.6 |  | 594.8
PPAs | WECI |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Gross carrying amount | 653.9 |  | 653.9 |  | 653.9
Accumulated amortization | (106.1) |  | (106.1) |  | (66.6)
Net carrying amount | 547.8 |  | $ 547.8 |  | 587.3
PPAs | Blooming Grove , Tatanka Ridge, Jayhawk, Thunderhead, Samson I, and Sapphire Sky |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Weighted average remaining useful life |  |  | 11 years |  |
Proxy revenue swap | WECI |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Gross carrying amount | 7.2 |  | $ 7.2 |  | 7.2
Accumulated amortization | (4.0) |  | (4.0) |  | (3.5)
Net carrying amount | $ 3.2 |  | $ 3.2 |  | 3.7
Proxy revenue swap | Upstream |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Weighted average remaining useful life |  |  | 4 years |  |
Length of proxy revenue contract, in years | 10 years |  | 10 years |  |
Interconnection agreements | WECI |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Gross carrying amount | $ 4.7 |  | $ 4.7 |  | 4.7
Accumulated amortization | (1.1) |  | (1.1) |  | (0.9)
Net carrying amount | $ 3.6 |  | $ 3.6 |  | $ 3.8
Interconnection agreements | Tatanka Ridge and Bishop Hill III |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Weighted average remaining useful life |  |  | 16 years |  |

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