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Schedule I - Fair Value Measurements (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Notes to parent company financial statements |  |
Long-term debt, including current portion | $ 11,858.3 | $ 10,335.7
Carrying amount |  |
Notes to parent company financial statements |  |
Long-term debt, including current portion | 11,858.3 | 10,335.7
Fair value |  |
Notes to parent company financial statements |  |
Long-term debt, including current portion | 13,035.9 | 10,554.9
WEC Energy Group |  |
Notes to parent company financial statements |  |
Long-term notes receivable from UMERC | 0.0 | 150.0
WEC Energy Group | Carrying amount |  |
Notes to parent company financial statements |  |
Long-term notes receivable from UMERC | 0.0 | 150.0
Long-term debt, including current portion | 2,541.6 | 2,190.8
WEC Energy Group | Fair value |  |
Notes to parent company financial statements |  |
Long-term notes receivable from UMERC | 0.0 | 145.5
Long-term debt, including current portion | $ 2,619.4 | $ 2,132.8

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