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REGULATORY ENVIRONMENT - WI 2020 AND 2021 RATES (Details) - Public Service Commission of Wisconsin (PSCW) $ in Millions | 1 Months Ended
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Dec. 31, 2019 USD ($) utility | Sep. 30, 2017 USD ($)
2020 and 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
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% |
Electric rates | 2020 and 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization period | 2 years |
Natural gas rates | 2020 and 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization period | 4 years |
Number of gas utilities amortizing unprotected deferred tax expense over 4 years | utility | 3 |
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% |
WE | Electric rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Approved rate increase | $ 15.3 |
Approved rate increase (as a percent) | 0.50% |
WE | Electric rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 65.0 |
WE | Electric rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | 65.0 |
WE | Electric rates | 2020 and 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Pleasant Prairie power plant's book value to be securitized | 100.0 |
WE | Natural gas rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Approved rate increase | $ 10.4 |
Approved rate increase (as a percent) | 2.80% |
WE | Natural gas rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ (5.0) |
WE | Natural gas rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | (5.0) |
WE | Steam rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Approved rate increase | $ 1.9 |
Approved rate increase (as a percent) | 8.60% |
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% |
WPS | Electric rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Approved rate increase | $ 15.8 |
Approved rate increase (as a percent) | 1.60% |
WPS | Electric rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 11.0 |
WPS | Electric rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | 39.0 |
WPS | Electric rates | 2020 and 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Authorized Revenue Requirement For ReACT |  | $ 275.0
Cost of the ReACT project | $ 342.0 |
WPS | Electric rates | 2020 and 2021 rates | ReACT |  |
Public Utilities, General Disclosures [Line Items] |  |
Collection of ReACT Regulatory Asset in Years | 8 years |
WPS | Electric rates | 2020 and 2021 rates | Earnings sharing mechanisms |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization period | 2 years |
Amortization of regulatory liabilities | $ 21.0 |
WPS | Natural gas rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Approved rate increase | $ 4.3 |
Approved rate increase (as a percent) | 1.40% |
WPS | Natural gas rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 5.0 |
WPS | Natural gas rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 5.0 |
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% |
WG | Natural gas rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Approved rate increase | $ (1.5) |
Approved rate increase (as a percent) | (0.20%) |
WG | Natural gas rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 3.0 |
WG | Natural gas rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 3.0 |

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