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Schedule I - Income Statements (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income statements |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | $ 136.7 | $ 154.3 | $ 146.5
Other income, net |  |  |  |  |  |  |  |  | 70.3 | 73.7 | 66.6
Interest expense |  |  |  |  |  |  |  |  | 445.1 | 415.7 | 402.7
Income before income taxes |  |  |  |  |  |  |  |  | 1,230.3 | 1,588.4 | 1,506.7
Income tax benefit |  |  |  |  |  |  |  |  | (169.8) | (383.5) | (566.5)
Net income attributed to common shareholders | $ 205.0 | $ 233.2 | $ 231.0 | $ 390.1 | $ 432.6 | $ 215.4 | $ 199.1 | $ 356.6 | 1,059.3 | 1,203.7 | 939.0
WEC Energy Group |  |  |  |  |  |  |  |  |  |  |
Income statements |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 5.0 | 6.0 | 7.0
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 1,108.3 | 1,234.7 | 996.5
Other income, net |  |  |  |  |  |  |  |  | 6.8 | 2.1 | 2.7
Interest expense |  |  |  |  |  |  |  |  | 104.1 | 82.0 | 90.0
Income before income taxes |  |  |  |  |  |  |  |  | 1,006.0 | 1,148.8 | 902.2
Income tax benefit |  |  |  |  |  |  |  |  | 53.3 | 54.9 | 36.8
Net income attributed to common shareholders |  |  |  |  |  |  |  |  | $ 1,059.3 | $ 1,203.7 | $ 939.0

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