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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 199.3 | $ 198.3
Property, plant, and equipment, accumulated depreciation and amortization, | $ 10,383.8 | $ 9,889.3
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, 2022 and December 31, 2021 include $92.4 and $100.7, respectively, related to WEPCo Environmental Trust) | $ 3,264.6 | $ 3,264.8
Current portion of long-term debt (December 31, 2022 and December 31, 2021 include $8.9 and $8.8, respectively, related to WEPCo Environmental Trust) | 808.5 | 91.0
Long-term debt (December 31, 2022 and December 31, 2021 include $94.1 and $102.7, respectively, related to WEPCo Environmental Trust) | 14,655.7 | 13,472.4
WEPCo Environmental Trust |  |
Balance sheets |  |
Regulatory assets (December 31, 2022 and December 31, 2021 include $92.4 and $100.7, respectively, related to WEPCo Environmental Trust) | 92.4 | 100.7
Current portion of long-term debt (December 31, 2022 and December 31, 2021 include $8.9 and $8.8, respectively, related to WEPCo Environmental Trust) | 8.9 | 8.8
Long-term debt (December 31, 2022 and December 31, 2021 include $94.1 and $102.7, respectively, related to WEPCo Environmental Trust) | $ 94.1 | $ 102.7

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