Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Current assets
Cash and cash equivalents	$ 42.9	$ 28.9
Accounts receivable and unbilled revenues, net of reserves of $193.5 and $199.3, respectively	1,503.2	1,818.4
Materials, supplies, and inventories	775.2	807.1
Prepaid Taxes	173.9	201.8
Other prepayments	76.8	69.8
Other	223.7	261.7
Current assets	2,795.7	3,187.7
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $11,073.1 and $10,383.8, respectively	31,581.5	29,113.8
Regulatory assets (December 31, 2023 and December 31, 2022 include $85.9 and $92.4, respectively, related to WEPCo Environmental Trust)	3,249.8	3,264.6
Equity investment in transmission affiliates	2,005.9	1,909.2
Goodwill	3,052.8	3,052.8
Pension and OPEB assets	870.9	916.7
Other	383.1	427.3
Long-term assets	41,144.0	38,684.4
Total assets	43,939.7	41,872.1
Current liabilities
Short-term debt	2,020.9	1,647.1
Current portion of long-term debt (December 31, 2023 and December 31, 2022 include $9.0 and $8.9, respectively, related to WEPCo Environmental Trust)	1,264.2	881.2
Accounts payable	896.6	1,198.1
Other	933.1	884.6
Current liabilities	5,114.8	4,611.0
Long-term liabilities
Long-term debt (December 31, 2023 and December 31, 2022 include $85.3 and $94.1, respectively, related to WEPCo Environmental Trust)	15,512.8	14,766.2
Deferred income taxes	4,918.5	4,625.6
Deferred revenue, net	356.4	370.7
Regulatory liabilities	3,697.7	3,735.5
Intangible liabilities	594.8	335.4
Environmental remediation liabilities	463.7	499.6
AROs	374.2	479.3
Pension and OPEB obligations	176.0	171.6
Other	659.3	660.6
Long-term liabilities	26,753.4	25,644.5
Commitments and contingencies (Note 24)
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	4,115.9	4,115.2
Retained earnings	7,612.8	7,265.3
Accumulated other comprehensive loss	(7.7)	(6.8)
Common shareholders' equity	11,724.2	11,376.9
Preferred stock of subsidiary	30.4	30.4
Noncontrolling interests	316.9	209.3
Total liabilities and equity	$ 43,939.7	$ 41,872.1