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Short-Term Debt and Lines of Credit - Outstanding Amounts (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
WE |  |
Short-term Debt [Line Items] |  |
Maximum debt to capitalization ratio | 65.00% |
WPS |  |
Short-term Debt [Line Items] |  |
Maximum debt to capitalization ratio | 65.00% |
WG |  |
Short-term Debt [Line Items] |  |
Maximum debt to capitalization ratio | 65.00% |
PGL |  |
Short-term Debt [Line Items] |  |
Maximum debt to capitalization ratio | 65.00% |
WEC Energy Group |  |
Short-term Debt [Line Items] |  |
Commercial paper outstanding | $ 697.0 | $ 399.7
Maximum debt to capitalization ratio | 70.00% |
Commercial paper |  |
Short-term Debt [Line Items] |  |
Commercial paper outstanding | $ 2,017.2 | $ 1,643.5
Average interest rate on amount outstanding | 5.49% | 4.64%
Average amount outstanding during the year | $ 1,196.8 |
Weighted- average interest rate during the year | 5.29% |
Operating expense loans |  |
Short-term Debt [Line Items] |  |
Operating expense loan outstanding | $ 3.7 | $ 3.6

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