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GOODWILL AND INTANGIBLES - INTANGIBLE LIABILITIES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020
Finite-Lived Intangible Liabilities |  |  |
Amortization | $ 1.9 | $ 5.6 |
Period of amortization |  | 5 years |
Amortization to be recorded in operating revenues |  |  |
Amortization to be recorded in the next five years |  |  |
2022 | 8.1 | $ 8.1 |
2023 | 8.1 | 8.1 |
2024 | 8.1 | 8.1 |
2025 | 8.1 | 8.1 |
2026 | 8.1 | 8.1 |
Amortization to be recorded in 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 | 96.6 | 96.6 | $ 88.4
Accumulated amortization | (7.2) | (7.2) | (1.6)
Net carrying amount | 89.4 | 89.4 | 86.8
PPAs | WECI |  |  |
Finite-Lived Intangible Liabilities |  |  |
Gross carrying amount | 84.3 | 84.3 | 76.1
Accumulated amortization | (4.9) | (4.9) | 0.0
Net carrying amount | 79.4 | $ 79.4 | 76.1
PPAs | Blooming Grove , Tatanka Ridge, and Jayhawk |  |  |
Finite-Lived Intangible Liabilities |  |  |
Weighted average life |  | 11 years |
Proxy revenue swap | WECI |  |  |
Finite-Lived Intangible Liabilities |  |  |
Gross carrying amount | 7.2 | $ 7.2 | 7.2
Accumulated amortization | (1.9) | (1.9) | (1.3)
Net carrying amount | 5.3 | $ 5.3 | 5.9
Proxy revenue swap | Upstream |  |  |
Finite-Lived Intangible Liabilities |  |  |
Weighted average life |  | 7 years |
Length of proxy revenue contract, in years |  | 10 years |
Interconnection agreements | WECI |  |  |
Finite-Lived Intangible Liabilities |  |  |
Gross carrying amount | 5.1 | $ 5.1 | 5.1
Accumulated amortization | (0.4) | (0.4) | (0.3)
Net carrying amount | $ 4.7 | $ 4.7 | $ 4.8
Interconnection agreements | Tatanka Ridge and Bishop Hill III |  |  |
Finite-Lived Intangible Liabilities |  |  |
Weighted average life |  | 19 years |

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