CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 3.6	$ 5.7
Accounts receivable and accrued unbilled revenues, net of reserves of $3.8 and $2.5, respectively	164.4	209.8
Receivables from related parties	1.6	5.2
Inventories
Fuel and gas	82.9	60.0
Materials and supplies, at average cost	38.2	34.9
Regulatory assets	30.0	46.2
Prepaid taxes	28.7	63.6
Other current assets	14.0	16.7
Current assets	363.4	442.1
Property, plant, and equipment, net of accumulated depreciation of $1,547.4 and $1,483.1, respectively	3,053.8	2,887.7
Regulatory assets	343.9	342.5
Goodwill	36.4	36.4
Pension and other postretirement benefit assets	224.0	145.1
Other long-term assets	108.2	107.5
Total assets	4,129.7	3,961.3
Liabilities and Shareholders' Equity
Short-term debt	63.0	25.6
Current portion of long-term debt to parent	2.1	0
Accounts payable	143.1	131.8
Payables to related parties	11.4	13.8
Regulatory liabilities	8.8	38.0
Accrued interest	21.5	6.0
Other current liabilities	66.5	66.0
Current liabilities	316.4	281.2
Long-term debt to parent	3.6	6.3
Long-term debt	1,174.5	1,174.5
Deferred income taxes	672.5	619.5
Deferred investment tax credits	7.8	8.1
Regulatory liabilities	337.5	286.3
Environmental remediation liabilities	76.0	64.4
Pension and other postretirement benefit obligations	33.8	76.4
Payables to related parties	5.6	6.1
Other long-term liabilities	67.5	71.9
Long-term liabilities	2,378.8	2,313.5
Commitments and contingencies
Preferred stock - $100 par value; 1,000,000 shares authorized; 511,882 shares issued and outstanding	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	765.9	723.5
Retained earnings	521.8	496.3
Total liabilities and shareholders’ equity	$ 4,129.7	$ 3,961.3