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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Accounts receivable and unbilled revenues, reserves $ 198.3 $ 220.1
Property, plant, and equipment, accumulated depreciation and amortization, $ 9,889.3 $ 9,364.7
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, 2021 includes $100.7 related to WEPCo Environmental Trust) $ 3,264.8 $ 3,524.1
Current portion of long-term debt (December 31, 2021 includes $8.8 related to WEPCo Environmental Trust) 91.0 777.7
Long-term debt (December 31, 2021 includes $102.7 related to WEPCo Environmental Trust) 13,472.4 $ 11,672.8
WEPCo Environmental Trust    
Balance sheets    
Regulatory assets (December 31, 2021 includes $100.7 related to WEPCo Environmental Trust) 100.7  
Current portion of long-term debt (December 31, 2021 includes $8.8 related to WEPCo Environmental Trust) 8.8  
Long-term debt (December 31, 2021 includes $102.7 related to WEPCo Environmental Trust) $ 102.7