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REGULATORY ENVIRONMENT - WI 2020 AND 2021 RATES (Details) $ in Millions | 1 Months Ended
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May 31, 2021 USD ($) | Nov. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) utility
WEPCo Environmental Trust | WEPCo Environmental Trust Bonds 1.578%, due 2035 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Proceeds from issuance of debt | $ 118.8 |  |
Debt instrument stated interest rate percentage | 1.578% |  |
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Number of utilities filing rate requests | utility |  |  | 3
Number of utilities with earnings sharing mechanism | utility |  |  | 3
Percentage of first 25 basis points of additional earnings retained by the utility |  |  | 100.00%
Return on equity in excess of authorized amount (as a percent) |  |  | 0.25%
Percentage of additional earnings between 25 and 75 basis points refunded to customers |  |  | 50.00%
Return on equity in excess of first 25 basis points above authorized amount (as a percent) |  |  | 0.50%
Percentage of earnings in excess of 75 basis points refunded to customers |  |  | 100.00%
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | Electric rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization period |  |  | 2 years
Public Service Commission of Wisconsin (PSCW) | 2020 and 2021 rates | Natural gas rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Number of utilities filing rate requests | utility |  |  | 3
Amortization period |  |  | 4 years
Public Service Commission of Wisconsin (PSCW) | WE | 2020 and 2021 rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved return on equity (as a percent) |  |  | 10.00%
Approved common equity component average (as a percent) |  |  | 52.50%
Public Service Commission of Wisconsin (PSCW) | WE | 2020 and 2021 rates | Electric rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Pleasant Prairie power plant's book value to be securitized |  | $ 100.0 |
Public Service Commission of Wisconsin (PSCW) | WE | 2020 rates | Electric rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved rate increase |  |  | $ 15.3
Approved rate increase (as a percent) |  |  | 0.50%
Public Service Commission of Wisconsin (PSCW) | WE | 2020 rates | Electric rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization of regulatory liabilities |  |  | $ 65.0
Public Service Commission of Wisconsin (PSCW) | WE | 2020 rates | Natural gas rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved rate increase |  |  | $ 10.4
Approved rate increase (as a percent) |  |  | 2.80%
Public Service Commission of Wisconsin (PSCW) | WE | 2020 rates | Natural gas rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization of regulatory liabilities |  |  | $ (5.0)
Public Service Commission of Wisconsin (PSCW) | WE | 2020 rates | Steam rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved rate increase |  |  | $ 1.9
Approved rate increase (as a percent) |  |  | 8.60%
Public Service Commission of Wisconsin (PSCW) | WE | 2021 rates | Electric rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization of regulatory liabilities |  |  | $ 65.0
Public Service Commission of Wisconsin (PSCW) | WE | 2021 rates | Natural gas rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization of regulatory liabilities |  |  | $ (5.0)
Public Service Commission of Wisconsin (PSCW) | WPS | 2020 and 2021 rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved return on equity (as a percent) |  |  | 10.00%
Approved common equity component average (as a percent) |  |  | 52.50%
Public Service Commission of Wisconsin (PSCW) | WPS | 2020 and 2021 rates | Electric rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Authorized revenue requirement for ReACT |  |  | $ 275.0
Cost of the ReACT project |  |  | $ 342.0
Public Service Commission of Wisconsin (PSCW) | WPS | 2020 and 2021 rates | Electric rates | ReACT |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Collection of ReACT regulatory asset in years |  |  | 8 years
Public Service Commission of Wisconsin (PSCW) | WPS | 2020 and 2021 rates | Electric rates | Earnings sharing mechanisms |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization period |  |  | 2 years
Amortization of regulatory liabilities |  |  | $ 21.0
Public Service Commission of Wisconsin (PSCW) | WPS | 2020 rates | Electric rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved rate increase |  |  | $ 15.8
Approved rate increase (as a percent) |  |  | 1.60%
Public Service Commission of Wisconsin (PSCW) | WPS | 2020 rates | Electric rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization of regulatory liabilities |  |  | $ 11.0
Public Service Commission of Wisconsin (PSCW) | WPS | 2020 rates | Natural gas rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved rate increase |  |  | $ 4.3
Approved rate increase (as a percent) |  |  | 1.40%
Public Service Commission of Wisconsin (PSCW) | WPS | 2020 rates | Natural gas rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization of regulatory liabilities |  |  | $ 5.0
Public Service Commission of Wisconsin (PSCW) | WPS | 2021 rates | Electric rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization of regulatory liabilities |  |  | 39.0
Public Service Commission of Wisconsin (PSCW) | WPS | 2021 rates | Natural gas rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization of regulatory liabilities |  |  | $ 5.0
Public Service Commission of Wisconsin (PSCW) | WG | 2020 and 2021 rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved return on equity (as a percent) |  |  | 10.20%
Approved common equity component average (as a percent) |  |  | 52.50%
Public Service Commission of Wisconsin (PSCW) | WG | 2020 rates | Natural gas rates |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Approved rate increase |  |  | $ (1.5)
Approved rate increase (as a percent) |  |  | (0.20%)
Public Service Commission of Wisconsin (PSCW) | WG | 2020 rates | Natural gas rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization of regulatory liabilities |  |  | $ 3.0
Public Service Commission of Wisconsin (PSCW) | WG | 2021 rates | Natural gas rates | Tax Cuts and Jobs Act of 2017 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Amortization of regulatory liabilities |  |  | $ 3.0
Public Service Commission of Wisconsin (PSCW) | WEPCo Environmental Trust | WEPCo Environmental Trust Bonds 1.578%, due 2035 |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Proceeds from issuance of debt | $ 118.8 |  |
Debt instrument stated interest rate percentage | 1.578% |  |

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