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Long-Term Debt - Issuances and Redemptions (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 07, 2024 | Dec. 31, 2024 | Nov. 30, 2024 | Oct. 31, 2024 | Sep. 30, 2024 | May 31, 2024 | Mar. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Gain on Extinguishment of Debt |  |  |  |  |  |  |  |  | $ 23.1 | $ 0.5 | $ 0.0
WE |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
DOE Federal Loan Guarantee |  | $ 2,500.0 |  |  |  |  |  |  | 2,500.0 |  |
Unsecured debt |  | 3,935.0 |  |  |  |  |  |  | 3,935.0 | 3,285.0 |
WG |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Unsecured debt |  | $ 840.0 |  |  |  |  |  |  | $ 840.0 | 790.0 |
5.00% WE Debentures due 05/15/2029 | WE |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  |  | $ 350.0 |  |  |  |  |
Interest rate |  |  |  |  |  | 5.00% |  |  |  |  |
4.60% WE Debentures due 10/01/2034 | WE |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  | $ 300.0 |  |  |  |  |  |
Interest rate |  |  |  |  | 4.60% |  |  |  |  |  |
5.05% WE Debentures due 10/01/2054 | WE |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  | $ 300.0 |  |  |  |  |  |
Interest rate |  |  |  |  | 5.05% |  |  |  |  |  |
2.05% WE Debentures due December 2024 | WE |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 2.05% |  |  |  |  |  |  | 2.05% |  |
Repayment of long-term debt |  | $ 300.0 |  |  |  |  |  |  |  |  |
4.55% WPS Senior Notes due 12/01/2029 | WPS |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  | $ 300.0 |  |  |  |  |  |  |  |  |
Interest rate |  | 4.55% |  |  |  |  |  |  | 4.55% |  |
4.86% WG Debentures due 11/01/2029 | WG |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  | $ 100.0 |  |  |  |  |  |  |
Interest rate |  |  |  | 4.86% |  |  |  |  |  |  |
5.18% WG Debentures due 11/01/2034 | WG |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  | $ 100.0 |  |  |  |  |  |  |
Interest rate |  |  |  | 5.18% |  |  |  |  |  |  |
2.38% WG Debentures due November 2024 | WG |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 2.38% |  |  |  |  |  |  |  |
Repayment of long-term debt |  |  | $ 150.0 |  |  |  |  |  |  |  |
2.64% PGL Bonds due November 2024 | PGL |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  | 2.64% |  |  |  |  |  |  |  |
Redemption of secured debt |  |  | $ 75.0 |  |  |  |  |  |  |  |
4.85% MGU Senior Notes due 11/01/2029 | MGU |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  | $ 10.0 |  |  |  |  |  |  |
Interest rate |  |  |  | 4.85% |  |  |  |  |  |  |
5.23% MGU Senior Notes due 11/01/2034 | MGU |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  | $ 15.0 |  |  |  |  |  |  |
Interest rate |  |  |  | 5.23% |  |  |  |  |  |  |
5.41% Bluewater Senior Notes due 11/01/2041 | Bluewater |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  | $ 25.0 |  |  |  |  |  |  |
Interest rate |  |  |  | 5.41% |  |  |  |  |  |  |
5.73% WECI Energy Holding III LLC Senior Notes Due 12/31/2039 | WECI Energy Holding III |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  | $ 488.7 |  |  |  |  |  |  |  |  |
Interest rate |  | 5.73% |  |  |  |  |  |  | 5.73% |  |
WEC Energy Group |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Gain on Extinguishment of Debt |  |  |  |  |  |  |  |  | $ 23.1 | $ 0.0 | $ 0.0
WEC Energy Group | WEC Energy Group junior notes due 2067 |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 7.75% |
Unsecured debt | $ 500.0 |  |  |  |  | $ 377.9 |  |  |  | $ 500.0 |
Repayment of long-term debt | 115.2 |  |  |  |  | 18.7 |  |  |  |  |
Extinguishment of debt | 122.1 | $ 358.9 |  |  |  | 19.0 |  |  |  |  |
Gain on Extinguishment of Debt | $ 6.4 |  |  |  |  | $ 0.2 |  |  |  |  |
WEC Energy Group | WEC 0.80% Senior Notes $600M due March 15, 2024 |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 0.80% |  |  |  |
Repayment of long-term debt |  |  |  |  |  |  | $ 600.0 |  |  |  |
WEC Energy Group | 2024A Junior Notes due June 15, 2055 |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  | $ 254.0 |  |  |  |  |  |  |  |  |
Interest rate |  | 6.69% |  |  |  |  |  |  | 6.69% |  |
WEC Energy Group | 2024B Junior Notes due June 15, 2055 |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  | $ 496.0 |  |  |  |  |  |  |  |  |
Interest rate |  | 6.74% |  |  |  |  |  |  | 6.74% |  |
WEC Energy Group | WEC 5.60% Senior Notes due September 12, 2026 |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 5.60% |  |  |  |  |  |  | 5.60% |  |
Unsecured debt |  | $ 600.0 |  |  |  |  |  |  | $ 600.0 |  |
Repayment of long-term debt |  | 380.9 |  |  |  |  |  |  |  |  |
Extinguishment of debt |  | 250.0 |  |  |  |  |  |  |  |  |
Gain on Extinguishment of Debt |  | $ 16.5 |  |  |  |  |  |  |  |  |
WEC Energy Group | WEC 1.80% Senior Notes due October 15, 2030 |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Interest rate |  | 1.80% |  |  |  |  |  |  | 1.80% |  |
Unsecured debt |  | $ 450.0 |  |  |  |  |  |  | $ 450.0 |  |
Repayment of long-term debt |  | 380.9 |  |  |  |  |  |  |  |  |
Extinguishment of debt |  | 150.0 |  |  |  |  |  |  |  |  |
Gain on Extinguishment of Debt |  | $ 16.5 |  |  |  |  |  |  |  |  |
WEC Energy Group | WEC 4.375% Convertible Notes due June 1, 2027 |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  |  |  |  | $ 862.5 |  |  |
Interest rate |  |  |  |  |  |  |  | 4.375% |  |  |
WEC Energy Group | WEC 4.375% Convertible Notes due June 1, 2029 |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  |  |  |  | $ 862.5 |  |  |
Interest rate |  |  |  |  |  |  |  | 4.375% |  |  |

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