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Consolidated Balance Sheets (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Utility Plant:      
Electric $ 361.3 $ 356.9 $ 348.2
Gas 437.3 424.4 398.4
Common 31.5 30.9 30.6
Construction Work in Progress 58.2 21.0 37.8
Total Utility Plant 888.3 833.2 815.0
Less: Accumulated Depreciation 241.3 232.0 229.6
Net Utility Plant 647.0 601.2 585.4
Current Assets:      
Cash 12.3 9.8 9.5
Accounts Receivable, net 35.2 47.7 32.8
Accrued Revenue 40.2 63.4 44.5
Exchange Gas Receivable 12.8 9.4 11.3
Gas Inventory 1.2 1.1 1.0
Materials and Supplies 5.3 4.1 3.6
Prepayments and Other 4.5 4.2 4.3
Total Current Assets 111.5 139.7 107.0
Noncurrent Assets:      
Regulatory Assets 120.9 134.6 132.5
Other Noncurrent Assets 15.8 16.8 17.0
Total Noncurrent Assets 136.7 151.4 149.5
TOTAL ASSETS 895.2 892.3 841.9
Capitalization:      
Common Stock Equity 253.9 260.4 250.9
Preferred Stock 0.2 0.2 2.0
Long-Term Debt, Less Current Portion 286.9 287.3 287.5
Total Capitalization 541.0 547.9 540.4
Current Liabilities:      
Long-Term Debt, Current Portion 0.6 0.5 0.5
Accounts Payable 21.5 32.7 19.2
Short-Term Debt 43.6 49.4 24.1
Energy Supply Contract Obligations 15.4 13.8 17.8
Current Deferred Income Taxes 2.3 13.4 5.9
Dividends Declared and Payable 4.8   4.8
Interest Payable 5.4 3.1 5.4
Regulatory Liabilities 11.4 6.8 7.3
Other Current Liabilities 10.5 11.4 10.0
Total Current Liabilities 115.5 131.1 95.0
Noncurrent Liabilities:      
Energy Supply Contract Obligations 2.7 3.3 3.6
Noncurrent Deferred Income Taxes 55.4 38.7 45.8
Cost of Removal Obligations 56.7 51.4 50.3
Retirement Benefit Obligations 107.9 103.7 88.9
Environmental Obligations 13.8 13.8 14.5
Other Noncurrent Liabilities 2.2 2.4 3.4
Total Noncurrent Liabilities 238.7 213.3 206.5
TOTAL CAPITALIZATION AND LIABILITIES $ 895.2 $ 892.3 $ 841.9