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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 162.8 | $ 193.5
Property, plant, and equipment, accumulated depreciation and amortization | $ 11,611.9 | $ 11,073.1
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 650,000,000 | 650,000,000
Common stock, shares outstanding | 317,680,855 | 315,434,531
Balance sheets |  |
Regulatory assets (December 31, 2024 and December 31, 2023 include $76.5 and $85.9, respectively, related to WEPCo Environmental Trust) | $ 3,339.7 | $ 3,249.8
Current portion of long-term debt (December 31, 2024 and December 31, 2023 include $9.2 and $9.0, respectively, related to WEPCo Environmental Trust) | 1,729.0 | 1,264.2
Long-term debt (December 31, 2024 and December 31, 2023 include $76.4 and $85.3, respectively, related to WEPCo Environmental Trust) | 17,178.1 | 15,366.9
WEPCo Environmental Trust |  |
Balance sheets |  |
Regulatory assets (December 31, 2024 and December 31, 2023 include $76.5 and $85.9, respectively, related to WEPCo Environmental Trust) | 76.5 | 85.9
Current portion of long-term debt (December 31, 2024 and December 31, 2023 include $9.2 and $9.0, respectively, related to WEPCo Environmental Trust) | 9.2 | 9.0
Long-term debt (December 31, 2024 and December 31, 2023 include $76.4 and $85.3, respectively, related to WEPCo Environmental Trust) | $ 76.4 | $ 85.3

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