CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 224.0	$ 42.9
Accounts receivable and unbilled revenues, net of reserves of $166.9 and $193.5, respectively	1,242.7	1,503.2
Materials, supplies, and inventories	695.8	775.2
Prepaid taxes	182.6	173.9
Other prepayments	52.6	76.8
Other	186.4	223.7
Current assets	2,584.1	2,795.7
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $11,263.4 and $11,073.1, respectively	32,263.8	31,581.5
Regulatory assets (June 30, 2024 and December 31, 2023 include $82.3 and $85.9, respectively, related to WEPCo Environmental Trust)	3,393.1	3,249.8
Equity investment in transmission affiliates	2,055.8	2,005.9
Goodwill	3,052.8	3,052.8
Pension and OPEB assets	901.2	870.9
Other	331.4	383.1
Long-term assets	41,998.1	41,144.0
Total assets	44,582.2	43,939.7
Current liabilities
Short-term debt	761.3	2,020.9
Current portion of long-term debt (June 30, 2024 and December 31, 2023 include $9.1 and $9.0, respectively, related to WEPCo Environmental Trust)	1,157.4	1,264.2
Accounts payable	799.9	896.6
Customer credit balances	178.8	236.2
Other	594.2	696.9
Current liabilities	3,491.6	5,114.8
Long-term liabilities
Long-term debt (June 30, 2024 and December 31, 2023 include $80.9 and $85.3, respectively, related to WEPCo Environmental Trust)	16,907.8	15,512.8
Deferred income taxes	5,265.4	4,918.5
Deferred revenue, net	345.5	356.4
Regulatory liabilities	3,834.7	3,697.7
Intangible liabilities	568.0	594.8
Environmental remediation liabilities	437.0	463.7
AROs	543.6	374.2
Other	794.2	835.3
Long-term liabilities	28,696.2	26,753.4
Commitments and contingencies (Note 23)
Common shareholders' equity
Common stock – $0.01 par value; 650,000,000 shares authorized; 316,079,401 and $315,434,531 shares outstanding, respectively	3.2	3.2
Additional paid in capital	4,168.3	4,115.9
Retained earnings	7,919.2	7,612.8
Accumulated other comprehensive loss	(7.8)	(7.7)
Common shareholders' equity	12,082.9	11,724.2
Preferred stock of subsidiary	30.4	30.4
Noncontrolling interests	281.1	316.9
Total liabilities and equity	$ 44,582.2	$ 43,939.7
Common stock, shares outstanding	316,079,401	315,434,531