CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 45.9	$ 28.9
Accounts receivable and unbilled revenues, net of reserves of $176.8 and $199.3, respectively	1,243.2	1,818.4
Materials, supplies, and inventories	749.9	807.1
Prepaid taxes	157.8	201.8
Other prepayments	40.6	69.8
Collateral on deposit	118.4	122.4
Other	87.8	139.3
Current assets	2,443.6	3,187.7
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $10,914.6 and $10,383.8, respectively	31,467.5	29,113.8
Regulatory assets (September 30, 2023 and December 31, 2022 include $87.5 and $92.4, respectively, related to WEPCo Environmental Trust)	3,197.1	3,264.6
Equity investment in transmission affiliates	1,983.8	1,909.2
Goodwill	3,052.8	3,052.8
Pension and OPEB assets	918.7	916.7
Other	378.2	427.3
Long-term assets	40,998.1	38,684.4
Total assets	43,441.7	41,872.1
Current liabilities
Short-term debt	1,549.3	1,647.1
Current portion of long-term debt (September 30, 2023 and December 31, 2022 include $9.0 and $8.9, respectively, related to WEPCo Environmental Trust)	712.9	881.2
Accounts payable	867.7	1,198.1
Other	943.8	884.6
Current liabilities	4,073.7	4,611.0
Long-term liabilities
Long-term debt (September 30, 2023 and December 31, 2022 include $89.8 and $94.1, respectively, related to WEPCo Environmental Trust)	15,956.5	14,766.2
Deferred income taxes	4,832.2	4,625.6
Deferred revenue, net	360.4	370.7
Regulatory liabilities	3,720.0	3,735.5
Intangible liabilities	608.2	335.4
Asset Retirement Obligation	505.5	479.3
Environmental remediation liabilities	456.6	499.6
Other	828.3	832.2
Long-term liabilities	27,267.7	25,644.5
Commitments and contingencies (Note 23)
Common shareholders' equity
Common stock – $0.01 par value; 325,000,000 shares authorized; 315,434,531 shares outstanding	3.2	3.2
Additional paid in capital	4,116.4	4,115.2
Retained earnings	7,640.4	7,265.3
Accumulated other comprehensive loss	(7.0)	(6.8)
Common shareholders' equity	11,753.0	11,376.9
Preferred stock of subsidiary	30.4	30.4
Noncontrolling interests	316.9	209.3
Total liabilities and equity	$ 43,441.7	$ 41,872.1