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Short-Term Debt and Lines of Credit - Outstanding Amounts (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Short-term Debt [Line Items] |  |  |  |  |
Issuance of short-term loan |  |  | $ 2.7 | $ 0.9 | $ 340.0
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 |  |  | $ 399.7 | 736.1 |
Issuance of short-term loan |  |  | $ 0.0 | 0.0 | $ 340.0
Maximum debt to capitalization ratio |  |  | 70.00% |  |
WEC Energy Group | WEC Senior Notes 0.80% due 2024 |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Interest rate | 0.80% |  |  |  |
Issuance of debt | $ 600.0 |  |  |  |
Commercial paper |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Commercial paper outstanding |  |  | $ 1,643.5 | $ 1,896.1 |
Average interest rate on amount outstanding |  |  | 4.64% | 0.26% |
Average amount outstanding during the year |  |  | $ 1,487.2 |  |
Weighted- average interest rate during the year |  |  | 1.98% |  |
Operating expense loans |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Operating expense loan outstanding |  |  | $ 3.6 | $ 0.9 |
Term loan |  |  |  |  |
Short-term Debt [Line Items] |  |  |  |  |
Issuance of short-term loan |  | $ 340.0 |  |  |
Length of term loan |  | 364 days |  |  |

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