CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 4.0	$ 7.9
Accounts receivable and unbilled revenues, net of reserves of $4.0	184.8	205.0
Accounts receivable from related parties	18.9	4.4
Materials, supplies, and inventories	113.9	107.0
Prepaid taxes	29.6	52.7
Other	15.6	13.0
Current assets	366.8	390.0
Long-term assets
Property, plant, and equipment, net of accumulated depreciation of $1,736.0 and $1,633.3, respectively	4,109.0	3,823.0
Regulatory assets	366.6	382.8
Goodwill	36.4	36.4
Pension and OPEB assets	74.4	62.0
Other	53.5	54.5
Long-term assets	4,639.9	4,358.7
Total assets	5,006.7	4,748.7
Current liabilities
Short-term debt	308.8	293.1
Current portion of long-term debt	250.0	250.0
Accounts payable	122.9	130.4
Accounts payable to related parties	45.4	30.0
Other	81.4	66.4
Current liabilities	808.5	769.9
Long-term liabilities
Long-term debt	916.9	916.2
Deferred income taxes	527.8	512.7
Deferred investment tax credits	6.4	6.7
Regulatory liabilities	705.4	689.3
Environmental remediation liabilities	99.6	99.6
Pension and OPEB obligations	24.2	24.0
Payables to related parties	3.0	3.5
Other	118.0	109.5
Long-term liabilities	2,401.3	2,361.5
Commitments and contingencies (Note 17)
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	1,116.2	996.1
Retained earnings	585.1	525.6
Common shareholder's equity	1,796.9	1,617.3
Total liabilities and equity	$ 5,006.7	$ 4,748.7