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LONG-TERM DEBT - ISSUANCES AND REDEMPTIONS (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Mar. 31, 2026 | Feb. 28, 2026 | Jan. 31, 2026 | Jun. 30, 2026 | Jun. 30, 2025
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of Long-term Debt |  |  |  |  | $ 1,189.1 | $ 567.6
PGL | Collateralized First Mortgage Bonds |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 100.0 |  |  |  |
5.65% $300M WE Debentures due 03/15/2056 | WE |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on long-term debt |  | 5.65% |  |  |  |
Proceeds from issuance of debt |  | $ 300.0 |  |  |  |
4.65% $400M WE Debentures due 06/15/2031 | WE |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on long-term debt | 4.65% |  |  |  | 4.65% |
Proceeds from issuance of debt | $ 400.0 |  |  |  |  |
5.10% $400M WE Debentures due 06/15/2036 | WE |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on long-term debt | 5.10% |  |  |  | 5.10% |
Proceeds from issuance of debt | $ 400.0 |  |  |  |  |
WPS 4.25% $300M Senior Notes due January 15, 2031 | WPS |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on long-term debt |  |  |  | 4.25% |  |
Proceeds from issuance of debt |  |  |  | $ 300.0 |  |
First and Refunding Mortgage Bonds, Series VV | PGL | Collateralized First Mortgage Bonds |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on long-term debt |  | 3.90% |  |  |  |
Secured Debt |  |  | $ 50.0 |  |  |
Repayments of Long-term Debt |  | $ 50.0 |  |  |  |
First and Refunding Mortgage Bonds, Series ZZ | PGL | Collateralized First Mortgage Bonds |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on long-term debt |  | 4.00% |  |  |  |
Secured Debt |  |  | $ 50.0 |  |  |
Repayments of Long-term Debt |  | $ 50.0 |  |  |  |
WEC Energy Group | WEC 4.75% Senior Notes $1000M due January 9, 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Repayment of long-term debt |  |  |  | $ 1,000.0 |  |
Interest rate on long-term debt |  |  |  | 4.75% |  |
WEC Energy Group | WEC 4.75% Senior Notes $400M due January 15, 2028 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on long-term debt |  |  | 4.75% |  |  |
Proceeds from issuance of debt |  |  | $ 400.0 |  |  |

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