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Schedule I - Short-Term Notes Payable to Related Parties (Details) - WEC Energy Group - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Notes to parent company financial statements |  |
Notes payable to related parties | $ 459.6 | $ 332.5
Integrys |  |
Notes to parent company financial statements |  |
Notes payable to related parties | 257.0 | 115.0
WECC |  |
Notes to parent company financial statements |  |
Notes payable to related parties | 109.2 | 106.5
WBS |  |
Notes to parent company financial statements |  |
Notes payable to related parties | 91.8 | 111.0
Bluewater |  |
Notes to parent company financial statements |  |
Notes payable to related parties | $ 1.6 | $ 0.0

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