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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Accounts receivable and unbilled revenues, reserves $ 176.8 $ 199.3
Property, plant, and equipment, accumulated depreciation and amortization $ 10,914.6 $ 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 (September 30, 2023 and December 31, 2022 include $87.5 and $92.4, respectively, related to WEPCo Environmental Trust) $ 3,197.1 $ 3,264.6
WEPCo Environmental Trust    
Regulatory assets (September 30, 2023 and December 31, 2022 include $87.5 and $92.4, respectively, related to WEPCo Environmental Trust) 87.5 92.4
Current portion of long-term debt (September 30, 2023 and December 31, 2022 include $9.0 and $8.9, respectively, related to WEPCo Environmental Trust) 9.0 8.9
Long-term debt (September 30, 2023 and December 31, 2022 include $89.8 and $94.1, respectively, related to WEPCo Environmental Trust) $ 89.8 $ 94.1