CONDENSED CONSOLIDATED BALANCE SHEETS Statement (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Assets
Cash and cash equivalents	$ 4.6	$ 6.5
Accounts receivable and accrued unbilled revenues, net of reserves of $5.2 and $2.5, respectively	175.4	258.3
Receivables from related parties	4.8	5.0
Inventories
Fuel and gas	64.1	76.3
Materials and supplies, at average cost	38.4	33.3
Regulatory assets	24.9	26.1
Prepaid taxes	91.3	84.7
Other current assets	12.3	13.3
Current assets	415.8	503.5
Property, plant, and equipment, net of accumulated depreciation of $1,456.4 and $1,336.0, respectively	2,793.2	2,353.0
Regulatory assets	570.6	536.2
Goodwill	36.4	36.4
Other long-term assets	127.2	92.8
Total assets	3,943.2	3,521.9
Liabilities and Shareholders' Equity
Short-term debt	347.2	95.4
Current portion of long-term debt	125.0	147.0
Accounts payable	109.1	131.0
Payables to related parties	14.0	13.5
Regulatory liabilities	31.0	27.6
Other current liabilities	57.8	61.8
Current liabilities	684.1	476.3
Long-term debt to parent	6.8	7.2
Long-term debt	724.5	724.4
Deferred income taxes	589.4	539.0
Deferred investment tax credits	8.3	8.5
Regulatory liabilities	284.6	281.0
Environmental remediation liabilities	65.5	68.8
Pension and other postretirement benefit obligations	143.0	164.6
Payables to related parties	6.4	6.7
Other long-term liabilities	75.0	72.7
Long-term liabilities	1,903.5	1,872.9
Commitments and contingencies
Preferred stock	51.2	51.2
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	722.3	555.4
Retained earnings	486.5	470.5
Total liabilities and shareholders’ equity	$ 3,943.2	$ 3,521.9