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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 159.4 | $ 162.8
Property, plant, and equipment, accumulated depreciation and amortization | $ 11,838.7 | $ 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 | 319,133,501 | 317,680,855
Regulatory assets (March 31, 2025 and December 31, 2024 include $74.3 and $76.5, respectively, related to WEPCo Environmental Trust) | $ 3,283.3 | $ 3,339.7
Current portion of long-term debt (March 31, 2025 and December 31, 2024 include $9.2, related to WEPCo Environmental Trust) | 2,729.9 | 1,729.0
Long-term debt (March 31, 2025 and December 31, 2024 include $76.5 and $76.4, respectively, related to WEPCo Environmental Trust) | 16,161.8 | 17,178.1
WEPCo Environmental Trust |  |
Regulatory assets (March 31, 2025 and December 31, 2024 include $74.3 and $76.5, respectively, related to WEPCo Environmental Trust) | 74.3 | 76.5
Current portion of long-term debt (March 31, 2025 and December 31, 2024 include $9.2, related to WEPCo Environmental Trust) | 9.2 | 9.2
Long-term debt (March 31, 2025 and December 31, 2024 include $76.5 and $76.4, respectively, related to WEPCo Environmental Trust) | $ 76.5 | $ 76.4

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