CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 5.4	$ 5.7
Accounts receivable and accrued unbilled revenues, net of reserves of $3.2 and $2.5, respectively	201.7	209.8
Receivables from related parties	1.3	5.2
Inventories
Fuel and gas	85.0	60.0
Materials and supplies, at average cost	39.2	34.9
Regulatory assets	25.0	46.2
Prepaid taxes	65.7	63.6
Other current assets	18.3	16.7
Current assets	441.6	442.1
Property, plant, and equipment, net of accumulated depreciation of $1,542.5 and $1,483.1, respectively	3,131.0	2,887.7
Regulatory assets	433.5	342.5
Goodwill	36.4	36.4
Pension and other postretirement benefit assets	128.9	145.1
Other long-term assets	107.3	107.5
Total assets	4,278.7	3,961.3
Liabilities and Shareholders' Equity
Short-term debt	145.1	25.6
Current portion of long-term debt	125.0	0
Current portion of long-term debt to parent	2.5	0
Accounts payable	161.6	131.8
Payables to related parties	16.9	13.8
Regulatory liabilities	21.2	38.0
Other current liabilities	69.3	72.0
Current liabilities	541.6	281.2
Long-term debt to parent	2.9	6.3
Long-term debt	1,049.5	1,174.5
Deferred income taxes	722.1	619.5
Deferred investment tax credits	7.8	8.1
Regulatory liabilities	303.3	286.3
Environmental remediation liabilities	86.3	64.4
Pension and other postretirement benefit obligations	37.6	76.4
Payables to related parties	5.4	6.1
Other long-term liabilities	71.6	71.9
Long-term liabilities	2,286.5	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	782.0	723.5
Retained earnings	521.8	496.3
Total liabilities and shareholders’ equity	$ 4,278.7	$ 3,961.3