CONDENSED BALANCE SHEETS - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 2.5	$ 2.7
Accounts receivable and unbilled revenues, net of reserves of $17.5 and $18.3, respectively	191.0	190.8
Accounts receivable from related parties	32.1	27.6
Materials, supplies, and inventories	76.4	92.7
Prepaid taxes	36.6	39.0
Other	24.4	12.2
Current assets	363.0	365.0
Long-term assets
Property, plant, and equipment, net of accumulated depreciation and amortization of $1,776.1 and $1,750.7, respectively	4,908.3	4,885.9
Regulatory assets	441.5	449.4
Goodwill	36.4	36.4
Pension and OPEB assets	166.5	159.2
Other	45.6	38.0
Long-term assets	5,598.3	5,568.9
Total assets	5,961.3	5,933.9
Current liabilities
Short-term debt	200.5	210.5
Current portion of long-term debt	400.0	400.0
Accounts payable	107.6	129.6
Accounts payable to related parties	55.8	48.8
Accrued payroll and benefits	19.0	22.0
Other	46.4	59.0
Current liabilities	829.3	869.9
Long-term liabilities
Long-term debt	1,247.1	1,244.8
Deferred income taxes	711.4	682.7
Deferred ITCs	51.5	41.3
Regulatory liabilities	760.9	772.6
Environmental remediation liabilities	88.3	88.3
Pension and OPEB obligations	19.0	19.3
Other	97.7	98.3
Long-term liabilities	2,975.9	2,947.3
Commitments and contingencies (Note 15)
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	1,436.5	1,436.4
Retained earnings	624.0	584.7
Common shareholders' equity	2,156.1	2,116.7
Total liabilities and equity	$ 5,961.3	$ 5,933.9