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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Accounts receivable and unbilled revenues, reserves	$ 213.8	$ 199.3
Property, plant, and equipment, accumulated depreciation and amortization	$ 10,532.3	$ 10,383.8
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	325,000,000	325,000,000
Common stock, shares outstanding	315,434,531	315,434,531
Regulatory assets (March 31, 2023 and December 31, 2022 include $90.9 and $92.4, respectively, related to WEPCo Environmental Trust)	$ 3,313.1	$ 3,264.6
WEPCo Environmental Trust
Regulatory assets (March 31, 2023 and December 31, 2022 include $90.9 and $92.4, respectively, related to WEPCo Environmental Trust)	90.9	92.4
Current portion of long-term debt (March 31, 2023 and December 31, 2022 each include $8.9 related to WEPCo Environmental Trust)	8.9	8.9
Long-term debt (March 31, 2023 and December 31, 2022 each include $94.1 related to WEPCo Environmental Trust)	$ 94.1	$ 94.1

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