CONDENSED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Current assets
Cash and cash equivalents	$ 0.3	$ 1.5
Materials, supplies, and inventories	158.2	167.1
Prepaid taxes	50.7	57.4
Other prepayments	3.8	8.2
Other	19.1	13.8
Current assets	483.8	502.7
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $2,260.7 and $2,190.8, respectively	6,280.0	6,139.2
Regulatory assets	432.2	449.7
Goodwill	36.4	36.4
Pension and OPEB assets	340.7	328.9
Other	42.5	38.8
Long-term assets	7,131.8	6,993.0
Total assets	7,615.6	7,495.7
Current liabilities
Short-term debt	83.5	62.0
Current portion of long-term debt	300.0	300.0
Customer credit balances	31.1	33.7
Other	60.2	53.0
Current liabilities	646.7	645.1
Long-term liabilities
Long-term debt	1,958.5	1,958.0
Finance lease obligations	75.7	65.7
Deferred income taxes	1,014.8	996.9
Deferred ITCs	72.9	68.2
Regulatory liabilities	698.8	696.3
Environmental remediation liabilities	76.8	77.3
AROs	196.9	191.2
Other	91.5	85.2
Long-term liabilities	4,185.9	4,138.8
Commitments and contingencies (Note 17)
Common shareholder's equity
Common stock – $4 par value; 32,000,000 shares authorized; 23,896,962 shares issued and outstanding	95.6	95.6
Additional paid in capital	1,857.4	1,857.2
Retained earnings	830.0	759.0
Common shareholder's equity	2,783.0	2,711.8
Total liabilities and equity	7,615.6	7,495.7
Related party
Current assets
Accounts receivables	16.3	29.6
Current liabilities
Accounts payable	77.7	77.5
Nonrelated party
Current assets
Accounts receivables	235.4	225.1
Current liabilities
Accounts payable	$ 94.2	$ 118.9