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REGULATORY ENVIRONMENT - MGU 2021 RATE APPLICATION (Details) - Michigan Public Service Commission (MPSC) - MGU - USD ($) $ in Millions | Sep. 09, 2021 | Jul. 01, 2020
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Public Utilities, General Disclosures [Line Items] |  |
Depreciation and interest expense approved for deferral |  | $ 5.0
Approved rate increase | $ 9.3 |
Approved rate increase (as a percent) | 6.35% |
Approved return on equity (as a percent) | 9.85% |
Approved common equity component average (as a percent) | 51.50% |
Planned capital investment | $ 31.7 |

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