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Schedule I - Income Statements (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income statements |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | $ 154.3 | $ 146.5 | $ 96.1
Other income, net |  |  |  |  |  |  |  |  | 64.6 | 80.8 | 58.9
Interest expense |  |  |  |  |  |  |  |  | 415.7 | 402.7 | 331.4
Income before income taxes |  |  |  |  |  |  |  |  | 1,588.4 | 1,506.7 | 1,074.1
Income tax benefit |  |  |  |  |  |  |  |  | (383.5) | (566.5) | (433.8)
Net income attributed to common shareholders | $ 432.6 | $ 215.4 | $ 199.1 | $ 356.6 | $ 194.4 | $ 217.0 | $ 181.4 | $ 346.2 | 1,203.7 | 939.0 | 638.5
WEC Energy Group |  |  |  |  |  |  |  |  |  |  |
Income statements |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 6.0 | 7.0 | 42.2
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 1,234.7 | 996.5 | 695.7
Other income, net |  |  |  |  |  |  |  |  | 2.1 | 2.7 | 23.2
Interest expense |  |  |  |  |  |  |  |  | 82.0 | 90.0 | 71.2
Income before income taxes |  |  |  |  |  |  |  |  | 1,148.8 | 902.2 | 605.5
Income tax benefit |  |  |  |  |  |  |  |  | 54.9 | 36.8 | 33.0
Net income attributed to common shareholders |  |  |  |  |  |  |  |  | $ 1,203.7 | $ 939.0 | $ 638.5

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