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Schedule I - Income Statements (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income statements |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | $ 146.5 | $ 96.1 | $ 66.0
Other income, net |  |  |  |  |  |  |  |  | 80.8 | 58.9 | 13.4
Interest expense |  |  |  |  |  |  |  |  | 402.7 | 331.4 | 240.3
Income before income taxes |  |  |  |  |  |  |  |  | 1,506.7 | 1,074.1 | 951.2
Income tax benefit |  |  |  |  |  |  |  |  | (566.5) | (433.8) | (361.7)
Net income attributed to common shareholders | $ 194.4 | $ 217.0 | $ 181.4 | $ 346.2 | $ 179.3 | $ 182.5 | $ 80.9 | $ 195.8 | 939.0 | 638.5 | 588.3
WEC Energy Group |  |  |  |  |  |  |  |  |  |  |
Income statements |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  | 7.0 | 42.2 | 26.8
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 996.5 | 695.7 | 635.0
Other income, net |  |  |  |  |  |  |  |  | 2.7 | 23.2 | 2.8
Interest expense |  |  |  |  |  |  |  |  | 90.0 | 71.2 | 53.1
Income before income taxes |  |  |  |  |  |  |  |  | 902.2 | 605.5 | 557.9
Income tax benefit |  |  |  |  |  |  |  |  | 36.8 | 33.0 | 30.4
Net income attributed to common shareholders |  |  |  |  |  |  |  |  | $ 939.0 | $ 638.5 | $ 588.3

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