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New Accounting Pronouncements (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Aug. 15, 2023 | Jul. 01, 2023 | Dec. 31, 2022 | Nov. 15, 2021
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WEC Energy Group | WEC Energy Group junior notes due 2067 |  |  |  |  |
Long-term debt |  |  |  |  |
Unsecured debt | $ 500.0 | $ 500.0 | $ 500.0 | $ 500.0 | $ 500.0

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