CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 54.7	$ 28.9
Accounts receivable and unbilled revenues, net of reserves of $178.7 and $199.3, respectively	1,315.1	1,818.4
Materials, supplies, and inventories	603.7	807.1
Prepaid taxes	215.1	201.8
Other prepayments	42.8	69.8
Collateral on deposit	151.3	122.4
Other	74.9	139.3
Current assets	2,457.6	3,187.7
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $10,717.0 and $10,383.8, respectively	31,010.4	29,113.8
Regulatory assets (June 30, 2023 and December 31, 2022 include $89.5 and $92.4, respectively, related to WEPCo Environmental Trust)	3,238.9	3,264.6
Equity investment in transmission affiliates	1,955.9	1,909.2
Goodwill	3,052.8	3,052.8
Pension and OPEB assets	951.0	916.7
Other	352.7	427.3
Long-term assets	40,561.7	38,684.4
Total assets	43,019.3	41,872.1
Current liabilities
Short-term debt	1,090.3	1,647.1
Current portion of long-term debt (June 30, 2023 and December 31, 2022 include $9.0 and $8.9, respectively, related to WEPCo Environmental Trust)	1,377.5	881.2
Accounts payable	748.5	1,198.1
Other	880.6	884.6
Current liabilities	4,096.9	4,611.0
Long-term liabilities
Long-term debt (June 30, 2023 and December 31, 2022 include $89.7 and $94.1, respectively, related to WEPCo Environmental Trust)	15,608.3	14,766.2
Deferred income taxes	4,774.0	4,625.6
Deferred revenue, net	363.5	370.7
Regulatory liabilities	3,712.9	3,735.5
Intangible liabilities	621.6	335.4
Asset Retirement Obligation	502.9	479.3
Environmental remediation liabilities	475.8	499.6
Other	832.0	832.2
Long-term liabilities	26,891.0	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	4,114.7	4,115.2
Retained earnings	7,570.4	7,265.3
Accumulated other comprehensive loss	(6.9)	(6.8)
Common shareholders' equity	11,681.4	11,376.9
Preferred stock of subsidiary	30.4	30.4
Noncontrolling interests	319.6	209.3
Total liabilities and equity	$ 43,019.3	$ 41,872.1