CONDENSED BALANCE SHEETS - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 2.1	$ 2.7
Accounts receivable and unbilled revenues, net of reserves of $13.3 and $18.3, respectively	200.8	190.8
Accounts receivable from related parties	12.4	27.6
Materials, supplies, and inventories	89.2	92.7
Prepaid taxes	37.0	39.0
Other	20.6	12.2
Current assets	362.1	365.0
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $1,800.9 and $1,750.7, respectively	4,966.7	4,885.9
Regulatory assets	424.3	449.4
Goodwill	36.4	36.4
Pension and OPEB assets	175.0	159.2
Other	58.2	38.0
Long-term assets	5,660.6	5,568.9
Total assets	6,022.7	5,933.9
Current liabilities
Short-term debt	206.5	210.5
Current portion of long-term debt	400.0	400.0
Accounts payable	105.2	129.6
Accounts payable to related parties	32.6	48.8
Accrued payroll and benefits	23.5	22.0
Other	72.7	59.0
Current liabilities	840.5	869.9
Long-term liabilities
Long-term debt	1,247.8	1,244.8
Deferred income taxes	729.6	682.7
Deferred ITCs	59.7	41.3
Regulatory liabilities	751.8	772.6
Environmental remediation liabilities	87.7	88.3
Pension and OPEB obligations	18.8	19.3
Other	100.4	98.3
Long-term liabilities	2,995.8	2,947.3
Commitments and contingencies (Note 16)
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	1,436.6	1,436.4
Retained earnings	654.2	584.7
Common shareholders' equity	2,186.4	2,116.7
Total liabilities and equity	$ 6,022.7	$ 5,933.9