CONDENSED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 2.9	$ 2.7
Accounts receivable and unbilled revenues, net of reserves of $10.5 and $18.3, respectively	190.6	190.8
Accounts receivable from related parties	22.7	27.6
Materials, supplies, and inventories	97.4	92.7
Derivative assets	53.5	3.1
Prepaid taxes	28.1	39.0
Other	8.8	9.1
Current assets	404.0	365.0
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $1,834.1 and $1,750.7, respectively	5,040.0	4,885.9
Regulatory assets	414.8	449.4
Goodwill	36.4	36.4
Pension and OPEB assets	183.1	159.2
Other	51.8	38.0
Long-term assets	5,726.1	5,568.9
Total assets	6,130.1	5,933.9
Current liabilities
Short-term debt	106.5	210.5
Current portion of long-term debt	400.0	400.0
Accounts payable	135.6	129.6
Accounts payable to related parties	32.6	48.8
Other	126.0	81.0
Current liabilities	800.7	869.9
Long-term liabilities
Long-term debt	1,248.4	1,244.8
Deferred income taxes	750.9	682.7
Deferred ITCs	70.4	41.3
Regulatory liabilities	777.1	772.6
Environmental remediation liabilities	87.3	88.3
Pension and OPEB obligations	18.3	19.3
Other	93.7	98.3
Long-term liabilities	3,046.1	2,947.3
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	1,491.6	1,436.4
Retained earnings	696.1	584.7
Common shareholders' equity	2,283.3	2,116.7
Total liabilities and equity	$ 6,130.1	$ 5,933.9