Schedule I - Income Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income statements
Other income, net	$ 128.8	$ 133.2	$ 79.5
Interest expense	515.1	471.1	493.7
Loss on debt extinguishment	0.0	36.3	38.4
Income before income taxes	1,732.6	1,498.8	1,429.3
Income tax benefit	(322.9)	(200.3)	(227.9)
Net income attributed to common shareholders	1,408.1	1,300.3	1,199.9
WEC Energy Group
Income statements
Operating expenses (income)	(1.6)	12.0	5.3
Equity earnings of subsidiaries	1,473.0	1,367.0	1,283.8
Other income, net	2.4	1.7	1.3
Interest expense	109.6	70.2	96.9
Loss on debt extinguishment	0.0	23.1	38.4
Income before income taxes	1,367.4	1,263.4	1,144.5
Income tax benefit	40.7	36.9	55.4
Net income attributed to common shareholders	$ 1,408.1	$ 1,300.3	$ 1,199.9