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REGULATORY ENVIRONMENT - WI 2018 AND 2019 RATES (Details) - 2018 and 2019 rates - Public Service Commission of Wisconsin (PSCW) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) utility | Sep. 30, 2019 USD ($)
WE |  |
Public Utilities, General Disclosures [Line Items] |  |
Approved return on equity (as a percent) | 10.20% |
Income statement impact of flow through of repair-related deferred tax liabilities |  | $ 0.0
WG |  |
Public Utilities, General Disclosures [Line Items] |  |
Approved return on equity (as a percent) | 10.30% |
WPS |  |
Public Utilities, General Disclosures [Line Items] |  |
Approved return on equity (as a percent) | 10.00% |
Authorized revenue requirement for the ReACT project | $ 275.0 |
AFUDC for the ReACT project | 51.0 |
Cost of the ReACT project, excluding AFUDC | $ 342.0 |
WE, WG, and WPS |  |
Public Utilities, General Disclosures [Line Items] |  |
Number of utilities with earnings sharing mechanism | utility | 3 |
Percentage of first 50 basis points of additional utility earnings shared with customers | 50.00% |
Return on equity in excess of authorized amount (as a percent) | 0.50% |

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