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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Accounts receivable and unbilled revenues, reserves | $ 199.7 | $ 220.1
Property, plant, and equipment, accumulated depreciation and amortization | $ 9,799.3 | $ 9,364.7
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 (September 30, 2021 includes $102.9 related to WEPCo Environmental Trust) | $ 3,488.7 | $ 3,524.1
WEPCo Environmental Trust |  |
Regulatory assets (September 30, 2021 includes $102.9 related to WEPCo Environmental Trust) | 102.9 |
Current portion of long-term debt (September 30, 2021 includes $8.5 related to WEPCo Environmental Trust) | 8.5 |
Long-term debt (September 30, 2021 includes $107.0 related to WEPCo Environmental Trust) | $ 107.0 |

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