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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