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Long-Term Debt - Issuances and Redemptions (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Nov. 30, 2021 | Oct. 31, 2021 | Jun. 30, 2021 | May 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Long-term debt |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment |  |  |  |  |  |  |  | $ (36.3) | $ (38.4) | $ 0.0
Term loan |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Length of term loan |  |  |  |  |  |  | 364 days |  |  |
WE |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Unsecured debt | $ 2,785.0 |  |  |  |  |  |  | 2,785.0 | 2,785.0 |
WG |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Unsecured debt | 790.0 |  |  |  |  |  |  | 790.0 | 640.0 |
WE Debentures 1.70% due 2028 | WE |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  | $ 300.0 |  |  |  |  |  |
Interest rate |  |  |  | 1.70% |  |  |  |  |  |
WE Debentures 2.95% due 2021 | WE |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 2.95% |  |  |  |  |  |
Early repayment of long-term debt |  |  |  | $ 300.0 |  |  |  |  |  |
WEPCo Environmental Trust Bonds 1.578%, due 2035 | WEPCo Environmental Trust Finance I, LLC |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  | $ 118.8 |  |  |  |  |
Interest rate |  |  |  |  | 1.578% |  |  |  |  |
WPS Senior Notes 2.85% due 2051 | WPS |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Issuance of debt |  | $ 450.0 |  |  |  |  |  |  |  |
Interest rate |  | 2.85% |  |  |  |  |  |  |  |
WPS Senior Notes 3.35% due 2021 | WPS |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Interest rate |  | 3.35% |  |  |  |  |  |  |  |
Early repayment of long-term debt |  | $ 400.0 |  |  |  |  |  |  |  |
WG Debentures 2.07% due 2028 | WG |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Issuance of debt |  | $ 150.0 |  |  |  |  |  |  |  |
Interest rate |  | 2.07% |  |  |  |  |  |  |  |
Integrys Holding Inc Junior Notes Due 2073 | Integrys Holding |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Early repayment of long-term debt |  |  | $ 196.4 |  |  |  |  |  |  |
Extinguishment of debt |  |  | 178.6 |  |  |  |  |  |  |
Unsecured debt |  |  | 400.0 |  |  |  |  |  |  |
Loss on debt extinguishment |  |  | $ 13.2 |  |  |  |  |  |  |
PGL Series LLL Bonds 2.20% due 2028 | PGL |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Issuance of debt |  | $ 200.0 |  |  |  |  |  |  |  |
Interest rate |  | 2.20% |  |  |  |  |  |  |  |
NSG Series S Bonds 2.20% 2028 | NSG |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Issuance of debt |  | $ 25.0 |  |  |  |  |  |  |  |
Interest rate |  | 2.20% |  |  |  |  |  |  |  |
MERC Senior Notes 2.07% 2028 | MERC |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Issuance of debt |  | $ 40.0 |  |  |  |  |  |  |  |
Interest rate |  | 2.07% |  |  |  |  |  |  |  |
WEC Energy Group |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Loss on debt extinguishment |  |  |  |  |  |  |  | $ (23.1) | $ (38.4) | $ 0.0
WEC Energy Group | Term loan |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Repayments of Short-term Debt |  |  |  |  |  | $ 340.0 |  |  |  |
Length of term loan |  |  |  |  |  | 364 days |  |  |  |
WEC Energy Group | WEC Senior Notes 0.80% due 2024 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  |  |  |  | $ 600.0 |  |  |  |
Interest rate |  |  |  |  |  | 0.80% |  |  |  |
WEC Energy Group | WEC Senior Notes 2.20% due 2028 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Issuance of debt | $ 500.0 |  |  |  |  |  |  |  |  |
Interest rate | 2.20% |  |  |  |  |  |  | 2.20% |  |
WEC Energy Group | WEC Senior Notes 3.55% due 2025 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |
Interest rate | 3.55% |  |  |  |  |  |  | 3.55% |  |
Early repayment of long-term debt | $ 300.0 |  |  |  |  |  |  |  |  |
Unsecured debt | 420.0 |  |  |  |  |  |  | $ 420.0 |  |
Loss on debt extinguishment | $ 23.1 |  |  |  |  |  |  |  |  |

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