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LONG-TERM DEBT (Details) - WEC Energy Group - USD ($) $ in Millions |  | 1 Months Ended
--- | --- | ---
Feb. 07, 2024 | Mar. 31, 2024
Floating Rate WEC Energy Group Junior Notes Due 2067 |  |
Debt Instrument [Line Items] |  |
Extinguishment of debt | $ 122.1 |
Unsecured debt | 500.0 |
Repayment of long-term debt | 115.2 |
Gain on early extinguishment of debt | $ 6.9 |
WEC 0.80% Senior Notes $600M due March 15, 2024 |  |
Debt Instrument [Line Items] |  |
Repayment of long-term debt |  | $ 600.0
Interest rate on long-term debt |  | 0.80%

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