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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 193.5 | $ 199.3
Property, plant, and equipment, accumulated depreciation and amortization | $ 11,073.1 | $ 10,383.8
Common stock, par value | $ 0.01 | $ 0.01
Common stock, shares authorized | 325,000,000 | 325,000,000
Common stock, shares outstanding | 315,434,531 | 315,434,531
Balance sheets |  |
Regulatory assets (December 31, 2023 and December 31, 2022 include $85.9 and $92.4, respectively, related to WEPCo Environmental Trust) | $ 3,249.8 | $ 3,264.6
Current portion of long-term debt (December 31, 2023 and December 31, 2022 include $9.0 and $8.9, respectively, related to WEPCo Environmental Trust) | 1,264.2 | 808.5
Long-term debt (December 31, 2023 and December 31, 2022 include $85.3 and $94.1, respectively, related to WEPCo Environmental Trust) | 15,366.9 | 14,655.7
WEPCo Environmental Trust |  |
Balance sheets |  |
Regulatory assets (December 31, 2023 and December 31, 2022 include $85.9 and $92.4, respectively, related to WEPCo Environmental Trust) | 85.9 | 92.4
Current portion of long-term debt (December 31, 2023 and December 31, 2022 include $9.0 and $8.9, respectively, related to WEPCo Environmental Trust) | 9.0 | 8.9
Long-term debt (December 31, 2023 and December 31, 2022 include $85.3 and $94.1, respectively, related to WEPCo Environmental Trust) | $ 85.3 | $ 94.1

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