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Schedule I - Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying amount |  |
Notes to parent company financial statements |  |
Long-term debt, including current portion | $ 18,907.1 | $ 16,631.1
Fair value |  |
Notes to parent company financial statements |  |
Long-term debt, including current portion | 17,840.8 | 15,564.3
Long-term debt, including current portion | 18,907.1 | 16,631.1
WEC Energy Group | Carrying amount |  |
Notes to parent company financial statements |  |
Long-term debt, including current portion | 6,755.4 | 5,792.8
WEC Energy Group | Carrying amount | WECI |  |
Notes to parent company financial statements |  |
Long-term notes receivable from WECI | 300.0 | 430.0
WEC Energy Group | Fair value |  |
Notes to parent company financial statements |  |
Long-term debt, including current portion | 6,776.0 | 5,596.0
WEC Energy Group | Fair value | WECI |  |
Notes to parent company financial statements |  |
Long-term notes receivable from WECI | $ 300.0 | $ 425.7

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