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Short-Term Debt and Lines of Credit - Credit Facilities (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) extension | Dec. 31, 2023 USD ($)
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 3,300.0 |
Available capacity under existing agreements | $ 2,183.3 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
WE | Credit facility maturing September 2026 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 500.0 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
WPS | Credit facility maturing September 2026 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 400.0 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
WG | Credit facility maturing September 2026 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 350.0 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
PGL | Credit facility maturing September 2026 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 350.0 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
WEC Energy Group |  |
Line of Credit Facility [Line Items] |  |
Commercial paper outstanding | $ 382.7 | $ 697.0
WEC Energy Group | Credit facility maturing September 2026 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 1,500.0 |
Number of extensions available on a credit facility | extension | 2 |
Length of credit facility extension | 1 year |
WEC Energy Group | Credit facility maturing October 2025 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 200.0 |
Letter of Credit |  |
Line of Credit Facility [Line Items] |  |
Letters of credit issued inside credit facilities | 2.3 |
Commercial paper |  |
Line of Credit Facility [Line Items] |  |
Commercial paper outstanding | $ 1,114.4 | $ 2,017.2

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