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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