CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents	$ 322.5	$ 42.9
Accounts receivable and unbilled revenues, net of reserves of $155.0 and $193.5, respectively	1,175.5	1,503.2
Materials, supplies, and inventories	789.9	775.2
Prepaid taxes	124.5	173.9
Other prepayments	50.7	76.8
Other	156.1	223.7
Current assets	2,619.2	2,795.7
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $11,442.8 and $11,073.1, respectively	32,852.9	31,581.5
Regulatory assets (September 30, 2024 and December 31, 2023 include $79.1 and $85.9, respectively, related to WEPCo Environmental Trust)	3,346.5	3,249.8
Equity investment in transmission affiliates	2,080.8	2,005.9
Goodwill	3,052.8	3,052.8
Pension and OPEB assets	918.1	870.9
Other	326.2	383.1
Long-term assets	42,577.3	41,144.0
Total assets	45,196.5	43,939.7
Current liabilities
Short-term debt	597.0	2,020.9
Current portion of long-term debt (September 30, 2024 and December 31, 2023 include $9.1 and $9.0, respectively, related to WEPCo Environmental Trust)	1,823.7	1,264.2
Accounts payable	740.7	896.6
Accrued interest	202.4	154.4
Other	645.6	778.7
Current liabilities	4,009.4	5,114.8
Long-term liabilities
Long-term debt (September 30, 2024 and December 31, 2023 include $80.9 and $85.3, respectively, related to WEPCo Environmental Trust)	16,889.2	15,512.8
Deferred income taxes	5,322.2	4,918.5
Deferred revenue, net	339.9	356.4
Regulatory liabilities	3,889.1	3,697.7
Intangible liabilities	554.6	594.8
Environmental remediation liabilities	430.5	463.7
AROs	547.9	374.2
Other	822.5	835.3
Long-term liabilities	28,795.9	26,753.4
Commitments and contingencies (Note 23)
Common shareholders' equity
Common stock – $0.01 par value; 650,000,000 shares authorized; 316,354,446 and $315,434,531 shares outstanding, respectively	3.2	3.2
Additional paid in capital	4,191.4	4,115.9
Retained earnings	7,895.3	7,612.8
Accumulated other comprehensive loss	(7.9)	(7.7)
Common shareholders' equity	12,082.0	11,724.2
Preferred stock of subsidiary	30.4	30.4
Noncontrolling interests	278.8	316.9
Total liabilities and equity	$ 45,196.5	$ 43,939.7