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Schedule I - Income Statements (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Oct. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income statements |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  | $ 175.8 | $ 127.6 | $ 136.7
Other income, net |  |  |  |  |  |  |  |  |  |  | 79.5 | 102.2 | 70.3
Interest expense |  |  |  |  |  |  |  |  |  |  | 493.7 | 501.5 | 445.1
Loss on debt extinguishment | $ (10.5) | $ (27.9) |  |  |  |  |  |  |  |  | (38.4) | 0.0 | 0.0
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 1,429.3 | 1,259.7 | 1,230.3
Income tax benefit |  |  |  |  |  |  |  |  |  |  | (227.9) | (125.0) | (169.8)
Net income attributed to common shareholders |  |  | $ 239.0 | $ 266.8 | $ 241.6 | $ 452.5 | $ 243.9 | $ 234.3 | $ 235.7 | $ 420.1 | 1,199.9 | 1,134.0 | 1,059.3
WEC Energy Group |  |  |  |  |  |  |  |  |  |  |  |  |
Income statements |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  | 5.3 | 4.7 | 5.0
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  | 1,283.8 | 1,210.5 | 1,108.3
Other income, net |  |  |  |  |  |  |  |  |  |  | 1.3 | 6.3 | 6.8
Interest expense |  |  |  |  |  |  |  |  |  |  | 96.9 | 122.3 | 104.1
Loss on debt extinguishment |  |  |  |  |  |  |  |  |  |  | (38.4) | 0.0 | 0.0
Income before income taxes |  |  |  |  |  |  |  |  |  |  | 1,144.5 | 1,089.8 | 1,006.0
Income tax benefit |  |  |  |  |  |  |  |  |  |  | 55.4 | 44.2 | 53.3
Net income attributed to common shareholders |  |  |  |  |  |  |  |  |  |  | $ 1,199.9 | $ 1,134.0 | $ 1,059.3

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