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LONG-TERM DEBT (Details) - USD ($) $ in Millions | 1 Months Ended
--- | ---
Apr. 30, 2023 | Mar. 31, 2023 | Jan. 31, 2023
Integrys Holding | Integrys Holding Inc Junior Notes Due 2073 |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate on long-term debt |  | 6.00% |
Extinguishment of debt |  | $ 18.9 |
Unsecured debt |  | 221.4 |
Early repayment of long-term debt |  | $ 18.6 |
WEC Energy Group | WEC 4.75% Senior Notes due January 9, 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of debt |  |  | $ 650.0
Interest rate on long-term debt |  |  | 4.75%
WEC Energy Group | WEC 4.75% Senior Notes due January 9, 2026 | Subsequent event |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of debt | $ 350.0 |  |
Interest rate on long-term debt | 4.75% |  |
WEC Energy Group | WEC 4.75% $450M Senior Notes due January 15, 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from issuance of debt |  |  | $ 450.0
Interest rate on long-term debt |  |  | 4.75%

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