Schedule I - Income Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income statements
Earnings from equity method investments	$ 158.1	$ 175.8	$ 127.6
Other income, net	133.2	79.5	102.2
Interest expense	471.1	493.7	501.5
Loss on debt extinguishment	(36.3)	(38.4)	0.0
Income before income taxes	1,498.8	1,429.3	1,259.7
Income tax benefit	(200.3)	(227.9)	(125.0)
Net income attributed to common shareholders	1,300.3	1,199.9	1,134.0
WEC Energy Group
Income statements
Operating expenses	12.0	5.3	4.7
Earnings from equity method investments	1,367.0	1,283.8	1,210.5
Other income, net	1.7	1.3	6.3
Interest expense	70.2	96.9	122.3
Loss on debt extinguishment	(23.1)	(38.4)	0.0
Income before income taxes	1,263.4	1,144.5	1,089.8
Income tax benefit	36.9	55.4	44.2
Net income attributed to common shareholders	$ 1,300.3	$ 1,199.9	$ 1,134.0