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GOODWILL AND INTANGIBLES - INTANGIBLE LIABILITIES (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets |  |
Period of amortization | 5 years |
Operating revenues |  |
Amortization to be recorded in the next five years |  |
2022 | $ 8.1 |
2023 | 8.1 |
2024 | 8.1 |
2025 | 8.1 |
2026 | 8.1 |
Other operation and maintenance |  |
Amortization to be recorded in the next five years |  |
2022 | 0.2 |
2023 | 0.2 |
2024 | 0.2 |
2025 | 0.2 |
2026 | 0.2 |
WECI |  |
Finite-Lived Intangible Assets |  |
Gross carrying amount | 96.9 | $ 88.4
Accumulated amortization | (3.5) | (1.6)
Net carrying amount | 93.4 | 86.8
PPAs | WECI |  |
Finite-Lived Intangible Assets |  |
Gross carrying amount | 84.6 | 76.1
Accumulated amortization | (1.6) | 0.0
Net carrying amount | $ 83.0 | 76.1
PPAs | Blooming Grove Wind Energy Center LLC, Tatanka Ridge Wind, LLC and Jayhawk |  |
Finite-Lived Intangible Assets |  |
Weighted average useful life | 11 years |
Proxy revenue swap | WECI |  |
Finite-Lived Intangible Assets |  |
Gross carrying amount | $ 7.2 | 7.2
Accumulated amortization | (1.5) | (1.3)
Net carrying amount | $ 5.7 | 5.9
Proxy revenue swap | Upstream |  |
Finite-Lived Intangible Assets |  |
Weighted average useful life | 8 years |
Length of proxy revenue contract, in years | 10 years |
Interconnection agreements | WECI |  |
Finite-Lived Intangible Assets |  |
Gross carrying amount | $ 5.1 | 5.1
Accumulated amortization | (0.4) | (0.3)
Net carrying amount | $ 4.7 | $ 4.8
Interconnection agreements | Tatanka Ridge Wind LLC and Bishop Hill Energy III LLC |  |
Finite-Lived Intangible Assets |  |
Weighted average useful life | 20 years |

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