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REGULATORY ENVIRONMENT - MGU 2021 RATE APPLICATION (Details) - Michigan Public Service Commission (MPSC) - MGU - USD ($) $ in Millions | Mar. 22, 2021 | Jul. 01, 2020
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Public Utilities, General Disclosures [Line Items] |  |
Depreciation and interest expense approved for deferral |  | $ 5.0
Requested rate increase | $ 15.1 |
Requested rate increase (as a percent) | 10.70% |
Requested return on equity (as a percent) | 10.20% |
Requested common equity component average (as a percent) | 52.50% |

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