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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 213.8 | $ 199.3
Property, plant, and equipment, accumulated depreciation and amortization | $ 10,532.3 | $ 10,383.8
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 | 315,434,531 | 315,434,531
Regulatory assets (March 31, 2023 and December 31, 2022 include $90.9 and $92.4, respectively, related to WEPCo Environmental Trust) | $ 3,313.1 | $ 3,264.6
WEPCo Environmental Trust |  |
Regulatory assets (March 31, 2023 and December 31, 2022 include $90.9 and $92.4, respectively, related to WEPCo Environmental Trust) | 90.9 | 92.4
Current portion of long-term debt (March 31, 2023 and December 31, 2022 each include $8.9 related to WEPCo Environmental Trust) | 8.9 | 8.9
Long-term debt (March 31, 2023 and December 31, 2022 each include $94.1 related to WEPCo Environmental Trust) | $ 94.1 | $ 94.1

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