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REGULATORY ENVIRONMENT - 2022 Rates (Details) - 2022 Rates - Public Service Commission of Wisconsin (PSCW) - utility | Sep. 22, 2021 | Mar. 23, 2021
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Public Utilities, General Disclosures [Line Items] |  |
Period to forego filing a rate case | 1 year |
Number of utilities entering into agreement |  | 3
Percentage of first 15 basis points of additional earnings retained by the utility | 100.00% |
Return on equity in excess of authorized amount (as a percent) | 0.15% |

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