CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 7.4	$ 5.7
Accounts receivable and accrued unbilled revenues, net of reserves of $4.3 and $2.5, respectively	253.0	209.8
Receivables from related parties	5.6	5.2
Inventories
Fuel and Gas	29.7	60.0
Materials and supplies, at average cost	36.6	34.9
Regulatory assets	40.0	46.2
Prepaid taxes	30.7	63.6
Other current assets	15.3	16.7
Current assets	418.3	442.1
Property, plant, and equipment, net of accumulated depreciation of $1,505.2 and $1,483.1, respectively	2,922.0	2,887.7
Regulatory assets	339.4	342.5
Goodwill	36.4	36.4
Pension and other postretirement benefit assets	213.9	145.1
Other long-term assets	109.2	107.5
Total assets	4,039.2	3,961.3
Liabilities and Shareholders' Equity
Short-term debt	18.2	25.6
Current portion of long-term debt to parent	2.3	0
Accounts payable	160.3	131.8
Payables to related parties	16.6	13.8
Regulatory liabilities	31.8	38.0
Accrued taxes	16.7	10.2
Accrued interest	20.3	6.0
Other current liabilities	47.1	55.8
Current liabilities	313.3	281.2
Long-term debt to parent	3.8	6.3
Long-term debt	1,174.5	1,174.5
Deferred income taxes	637.7	619.5
Deferred investment tax credits	8.0	8.1
Regulatory liabilities	338.8	286.3
Environmental remediation liabilities	64.1	64.4
Pension and other postretirement benefit obligations	33.1	76.4
Payables to related parties	5.9	6.1
Other long-term liabilities	70.4	71.9
Long-term liabilities	2,336.3	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	724.2	723.5
Retained earnings	518.6	496.3
Total liabilities and shareholders’ equity	$ 4,039.2	$ 3,961.3