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VARIABLE INTEREST ENTITIES - TRANSMISSION AFFILIATES (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
ATC |  |  |  |  |  |
Variable interest entities |  |  |  |  |  |
Ownership interest (as a percent) | 60.00% |  |  |  |  |
Equity investment | $ 1,959.2 | $ 1,931.8 | $ 1,884.6 | $ 1,851.8 | $ 1,813.6 | $ 1,766.9
ATC Holdco |  |  |  |  |  |
Variable interest entities |  |  |  |  |  |
Ownership interest (as a percent) | 75.00% |  |  |  |  |
Equity investment | $ 24.6 | $ 24.1 | $ 24.6 | $ 24.1 | $ 23.6 | $ 22.5

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