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GOODWILL AND INTANGIBLES - INTANGIBLE LIABILITIES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Finite-Lived Intangible Liabilities |  |  |  |  |
Amortization | $ 2.2 | $ 1.9 | $ 6.5 | $ 5.6 |
Period of amortization |  |  | 5 years |  |
Amortization to be recorded as an increase to operating revenues |  |  |  |  |
Amortization to be recorded in the next five years |  |  |  |  |
2022 | 10.6 |  | $ 10.6 |  |
2023 | 20.9 |  | 20.9 |  |
2024 | 20.9 |  | 20.9 |  |
2025 | 20.9 |  | 20.9 |  |
2026 | 20.9 |  | 20.9 |  |
Amortization to be recorded as a decrease to other operation and maintenance |  |  |  |  |
Amortization to be recorded in the next five years |  |  |  |  |
2022 | 0.2 |  | 0.2 |  |
2023 | 0.2 |  | 0.2 |  |
2024 | 0.2 |  | 0.2 |  |
2025 | 0.2 |  | 0.2 |  |
2026 | 0.2 |  | 0.2 |  |
WECI |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Gross carrying amount | 224.8 |  | 224.8 |  | $ 99.8
Accumulated amortization | (15.6) |  | (15.6) |  | (9.1)
Net carrying amount | 209.2 |  | 209.2 |  | 90.7
PPAs | WECI |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Gross carrying amount | 212.9 |  | 212.9 |  | 87.9
Accumulated amortization | (12.3) |  | (12.3) |  | (6.5)
Net carrying amount | 200.6 |  | $ 200.6 |  | 81.4
PPAs | Blooming Grove , Tatanka Ridge, Jayhawk, and Thunderhead |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Weighted average life |  |  | 10 years |  |
Proxy revenue swap | WECI |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Gross carrying amount | 7.2 |  | $ 7.2 |  | 7.2
Accumulated amortization | (2.6) |  | (2.6) |  | (2.1)
Net carrying amount | 4.6 |  | $ 4.6 |  | 5.1
Proxy revenue swap | Upstream |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Weighted average life |  |  | 6 years |  |
Length of proxy revenue contract, in years |  |  | 10 years |  |
Interconnection agreements | WECI |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Gross carrying amount | 4.7 |  | $ 4.7 |  | 4.7
Accumulated amortization | (0.7) |  | (0.7) |  | (0.5)
Net carrying amount | $ 4.0 |  | $ 4.0 |  | $ 4.2
Interconnection agreements | Tatanka Ridge and Bishop Hill III |  |  |  |  |
Finite-Lived Intangible Liabilities |  |  |  |  |
Weighted average life |  |  | 18 years |  |

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