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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Accounts receivable and unbilled revenues, reserves $ 199.3 $ 198.3
Property, plant, and equipment, accumulated depreciation and amortization, $ 10,383.8 $ 9,889.3
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 325,000,000 325,000,000
Common stock, shares outstanding 315,434,531 315,434,531
Balance sheets    
Regulatory assets (December 31, 2022 and December 31, 2021 include $92.4 and $100.7, respectively, related to WEPCo Environmental Trust) $ 3,264.6 $ 3,264.8
Current portion of long-term debt (December 31, 2022 and December 31, 2021 include $8.9 and $8.8, respectively, related to WEPCo Environmental Trust) 808.5 91.0
Long-term debt (December 31, 2022 and December 31, 2021 include $94.1 and $102.7, respectively, related to WEPCo Environmental Trust) 14,655.7 13,472.4
WEPCo Environmental Trust    
Balance sheets    
Regulatory assets (December 31, 2022 and December 31, 2021 include $92.4 and $100.7, respectively, related to WEPCo Environmental Trust) 92.4 100.7
Current portion of long-term debt (December 31, 2022 and December 31, 2021 include $8.9 and $8.8, respectively, related to WEPCo Environmental Trust) 8.9 8.8
Long-term debt (December 31, 2022 and December 31, 2021 include $94.1 and $102.7, respectively, related to WEPCo Environmental Trust) $ 94.1 $ 102.7