Schedule I - Income Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income statements
Other income, net	$ 178.2	$ 177.7	$ 128.8
Gain on debt extinguishments	(23.1)	(0.5)	0.0
Income before income taxes	1,746.3	1,536.3	1,732.6
Income tax benefit	(222.0)	(204.6)	(322.9)
Net income attributed to common shareholders	1,527.2	1,331.7	1,408.1
WEC Energy Group
Income statements
Operating expenses (income)	5.4	2.5	(1.6)
Equity earnings of subsidiaries	1,724.2	1,502.5	1,473.0
Other income, net	32.0	19.6	2.4
Interest expense	333.6	260.8	109.6
Gain on debt extinguishments	(23.1)	0.0	0.0
Income before income taxes	1,440.3	1,258.8	1,367.4
Income tax benefit	86.9	72.9	40.7
Net income attributed to common shareholders	$ 1,527.2	$ 1,331.7	$ 1,408.1