Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Current Assets:
Cash and Cash Equivalents	$ 14.3	$ 9.4	$ 7.5
Accounts Receivable, net	69.5	52.2	62.0
Accrued Revenue	49.6	56.6	47.4
Exchange Gas Receivable	1.3	10.8	1.7
Gas Inventory	0.6	1.2	0.5
Materials and Supplies	5.1	5.0	4.6
Prepayments and Other	5.2	4.8	5.3
Total Current Assets	145.6	140.0	129.0
Utility Plant:
Gas	483.0	477.3	429.7
Electric	377.3	375.6	359.6
Common	31.6	31.6	32.7
Construction Work in Progress	21.3	24.6	21.2
Total Utility Plant	913.2	909.1	843.2
Less: Accumulated Depreciation	246.4	243.5	234.9
Net Utility Plant	666.8	665.6	608.3
Other Noncurrent Assets:
Regulatory Assets	96.5	100.1	130.0
Other Assets	19.1	14.9	18.2
Total Other Noncurrent Assets	115.6	115.0	148.2
TOTAL ASSETS	928.0	920.6	885.5
Current Liabilities:
Accounts Payable	31.8	38.1	27.1
Short-Term Debt	59.2	60.2	32.6
Long-Term Debt, Current Portion	2.5	2.5	0.5
Energy Supply Obligations	6.1	14.4	7.1
Deferred Income Taxes	3.4	6.7	4.9
Dividends Declared and Payable			4.8
Environmental Obligations	1.4	1.0	1.0
Interest Payable	5.4	3.1	5.4
Regulatory Liabilities	13.1	9.7	11.6
Other Current Liabilities	8.8	9.0	8.9
Total Current Liabilities	131.7	144.7	103.9
Noncurrent Liabilities:
Deferred Income Taxes	82.5	73.2	52.5
Cost of Removal Obligations	59.2	57.3	53.0
Retirement Benefit Obligations	79.1	77.3	107.2
Environmental Obligations	12.8	13.8	13.8
Other Noncurrent Liabilities	4.0	4.3	5.4
Total Noncurrent Liabilities	237.6	225.9	231.9
Capitalization:
Long-Term Debt, Less Current Portion	284.7	284.8	287.2
Common Stock Equity:
Common Equity (Outstanding: 13,886,768, 13,812,763 and 13,841,400 Shares)	233.1	232.1	230.7
Retained Earnings	40.7	32.9	31.6
Total Common Stock Equity	273.8	265.0	262.3
Preferred Stock	0.2	0.2	0.2
Total Capitalization	558.7	550.0	549.7
TOTAL LIABILITIES AND CAPITALIZATION	$ 928.0	$ 920.6	$ 885.5