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Schedule I - Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Carrying amount |  |
Notes to parent company financial statements |  |
Long-term debt, including current portion | $ 16,631.1 | $ 15,464.2
Fair value |  |
Notes to parent company financial statements |  |
Long-term debt, including current portion | 15,564.3 | 13,921.3
Long-term debt, including current portion | 16,631.1 | 15,464.2
WEC Energy Group | Carrying amount |  |
Notes to parent company financial statements |  |
Long-term debt, including current portion | 5,792.8 | 4,447.2
WEC Energy Group | Carrying amount | WECI |  |
Notes to parent company financial statements |  |
Long-term notes receivable from WECI | 430.0 | 0.0
WEC Energy Group | Fair value |  |
Notes to parent company financial statements |  |
Long-term debt, including current portion | 5,596.0 | 4,095.6
WEC Energy Group | Fair value | WECI |  |
Notes to parent company financial statements |  |
Long-term notes receivable from WECI | $ 425.7 | $ 0.0

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