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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 190.7 | $ 193.5
Property, plant, and equipment, accumulated depreciation and amortization | $ 11,275.0 | $ 11,073.1
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized | 325,000,000 | 325,000,000
Common stock, shares outstanding | 315,822,587 | 315,434,531
Regulatory assets (March 31, 2024 and December 31, 2023 include $84.1 and $85.9, respectively, related to WEPCo Environmental Trust) | $ 3,247.0 | $ 3,249.8
WEPCo Environmental Trust |  |
Regulatory assets (March 31, 2024 and December 31, 2023 include $84.1 and $85.9, respectively, related to WEPCo Environmental Trust) | 84.1 | 85.9
Current portion of long-term debt (March 31, 2024 and December 31, 2023 include $9.0, related to WEPCo Environmental Trust) | 9.0 | 9.0
Long-term debt (March 31, 2024 and December 31, 2023 include $85.4 and $85.3, respectively, related to WEPCo Environmental Trust) | $ 85.4 | $ 85.3

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