Schedule I Statement of Comprehensive Income - Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statements of comprehensive income
Net income attributed to common shareholders	$ 1,408.1	$ 1,300.3	$ 1,199.9
WEC Energy Group
Statements of comprehensive income
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,404.5	1,303.9	1,197.2
Net income attributed to common shareholders	1,408.1	1,300.3	1,199.9
WEC Energy Group | Cash flow hedges
Statements of comprehensive income
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	$ 0.0	$ 0.2	$ (1.6)