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Consolidated Balance Sheets (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Utility Plant:      
Electric $ 359.1 $ 356.9 $ 345.9
Gas 431.6 424.4 393.4
Common 31.5 30.9 30.6
Construction Work in Progress 40.4 21.0 24.9
Total Utility Plant 862.6 833.2 794.8
Less: Accumulated Depreciation 237.2 232.0 226.2
Net Utility Plant 625.4 601.2 568.6
Current Assets:      
Cash 7.1 9.8 6.8
Accounts Receivable, net 40.8 47.7 33.2
Accrued Revenue 38.3 63.4 41.5
Exchange Gas Receivable 7.6 9.4 8.5
Gas Inventory 0.8 1.1 0.6
Materials and Supplies 5.4 4.1 4.1
Prepayments and Other 5.6 4.2 6.0
Total Current Assets 105.6 139.7 100.7
Noncurrent Assets:      
Regulatory Assets 125.9 134.6 135.3
Other Noncurrent Assets 17.3 16.8 20.1
Total Noncurrent Assets 143.2 151.4 155.4
TOTAL ASSETS 874.2 892.3 824.7
Capitalization:      
Common Stock Equity 257.8 260.4 254.7
Preferred Stock 0.2 0.2 2.0
Long-Term Debt, Less Current Portion 287.0 287.3 287.6
Total Capitalization 545.0 547.9 544.3
Current Liabilities:      
Long-Term Debt, Current Portion 0.6 0.5 0.5
Accounts Payable 21.7 32.7 17.4
Short-Term Debt 24.5 49.4 5.0
Energy Supply Contract Obligations 9.8 13.8 17.2
Current Deferred Income Taxes 3.1 13.4 3.7
Dividends Declared and Payable 4.8   4.8
Interest Payable 3.1 3.1 3.0
Regulatory Liabilities 13.3 6.8 8.0
Other Current Liabilities 9.7 11.4 10.8
Total Current Liabilities 90.6 131.1 70.4
Noncurrent Liabilities:      
Energy Supply Contract Obligations 2.9 3.3 3.8
Noncurrent Deferred Income Taxes 54.4 38.7 48.1
Cost of Removal Obligations 54.7 51.4 48.6
Retirement Benefit Obligations 110.6 103.7 91.1
Environmental Obligations 13.8 13.8 14.5
Other Noncurrent Liabilities 2.2 2.4 3.9
Total Noncurrent Liabilities 238.6 213.3 210.0
TOTAL CAPITALIZATION AND LIABILITIES $ 874.2 $ 892.3 $ 824.7