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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 148.9 | $ 148.7
Property, plant, and equipment, accumulated depreciation and amortization | $ 12,783.3 | $ 12,411.5
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 | 325,849,383 | 325,461,519
Regulatory assets (June 30, 2026 and December 31, 2025 include $63.6 and $67.5, respectively, related to WEPCo Environmental Trust) | $ 3,130.4 | $ 3,156.3
Current portion of long-term debt (June 30, 2026 and December 31, 2025 include $9.4 and $9.3, respectively, related to WEPCo Environmental Trust) | 1,413.5 | 1,519.4
Long-term debt (June 30, 2026 and December 31, 2025 include $62.8 and $67.4, respectively, related to WEPCo Environmental Trust) | 19,216.3 | 18,498.1
WEPCo Environmental Trust |  |
Regulatory assets (June 30, 2026 and December 31, 2025 include $63.6 and $67.5, respectively, related to WEPCo Environmental Trust) | 63.6 | 67.5
Current portion of long-term debt (June 30, 2026 and December 31, 2025 include $9.4 and $9.3, respectively, related to WEPCo Environmental Trust) | 9.4 | 9.3
Long-term debt (June 30, 2026 and December 31, 2025 include $62.8 and $67.4, respectively, related to WEPCo Environmental Trust) | $ 62.8 | $ 67.4

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