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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 129.5 | $ 162.8
Property, plant, and equipment, accumulated depreciation and amortization | $ 12,229.4 | $ 11,611.9
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized | 650,000,000 | 650,000,000
Common stock, shares outstanding | 325,294,252 | 317,680,855
Regulatory assets (September 30, 2025 and December 31, 2024 include $69.6 and $76.5, respectively, related to WEPCo Environmental Trust) | $ 3,217.4 | $ 3,339.7
Current portion of long-term debt (September 30, 2025 and December 31, 2024 include $9.2 related to WEPCo Environmental Trust) | 1,901.4 | 1,729.0
Long-term debt (September 30, 2025 and December 31, 2024 include $72.0 and $76.4, respectively, related to WEPCo Environmental Trust) | 17,663.3 | 17,178.1
WEPCo Environmental Trust |  |
Regulatory assets (September 30, 2025 and December 31, 2024 include $69.6 and $76.5, respectively, related to WEPCo Environmental Trust) | 69.6 | 76.5
Current portion of long-term debt (September 30, 2025 and December 31, 2024 include $9.2 related to WEPCo Environmental Trust) | 9.2 | 9.2
Long-term debt (September 30, 2025 and December 31, 2024 include $72.0 and $76.4, respectively, related to WEPCo Environmental Trust) | $ 72.0 | $ 76.4

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