CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 3.9	$ 6.1
Collateral on deposit	19.2	17.6
Accounts receivable and unbilled revenues, net of reserves of $3.7 and $2.5, respectively	165.7	164.0
Receivables from related parties	3.5	3.1
Materials, supplies, and inventories
Fuel and gas	90.0	104.5
Materials and supplies, at average cost	42.5	40.5
Prepaid taxes	28.7	48.1
Other current assets	7.5	9.4
Current assets	361.0	393.3
Long-term assets
Property, plant, and equipment, net of accumulated depreciation of $1,582.4 and $1,565.7, respectively	3,553.3	3,418.6
Regulatory assets	443.6	462.5
Goodwill	36.4	36.4
Pension and OPEB assets	113.4	102.4
Other long-term assets	121.3	91.9
Long-term assets	4,268.0	4,111.8
Total assets	4,629.0	4,505.1
Current liabilities
Short-term debt	148.5	182.8
Current portion of long-term debt to parent	0.0	2.9
Accounts payable	111.8	181.8
Payables to related parties	20.2	35.6
Accrued taxes	50.0	3.1
Accrued interest	20.2	6.8
Other current liabilities	40.5	40.3
Current liabilities	391.2	453.3
Long-term liabilities
Long-term debt	1,289.9	1,289.4
Deferred income taxes	859.6	774.1
Deferred investment tax credits	7.1	7.4
Regulatory liabilities	278.2	290.0
Environmental remediation liabilities	82.2	83.5
Pension and OPEB obligations	24.3	24.4
Payables to related parties	4.3	4.8
Other long-term liabilities	104.7	92.3
Long-term liabilities	2,650.3	2,565.9
Commitments and contingencies (Note 11)
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	916.8	861.8
Retained earnings	575.1	528.5
Shareholder's equity	1,587.5	1,485.9
Total liabilities and shareholder's equity	$ 4,629.0	$ 4,505.1