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Consolidated Balance Sheets (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Utility Plant:    
Electric $ 356.9 $ 333.3
Gas 424.4 382.3
Common 30.9 29.8
Construction Work in Progress 19.4 28.3
Utility Plant 831.6 773.7
Less: Accumulated Depreciation 230.4 216.5
Net Utility Plant 601.2 557.2
Current Assets:    
Cash 9.8 7.5
Accounts Receivable, net 45.9 44.2
Accrued Revenue 58.1 54.2
Gas Inventory 10.5 14.8
Material and Supplies 4.1 3.6
Prepayments and Other 4.2 4.5
Total Current Assets 132.6 128.8
Noncurrent Assets:    
Regulatory Assets 136.0 142.2
Other Noncurrent Assets 16.8 18.5
Total Noncurrent Assets 152.8 160.7
TOTAL ASSETS 886.6 846.7
Capitalization:    
Common Stock Equity 260.4 191.7
Preferred Stock 0.2 2.0
Long-Term Debt, Less Current Portion 287.3 287.8
Total Capitalization 547.9 481.5
Current Liabilities:    
Long-Term Debt, Current Portion 0.5 0.5
Accounts Payable 30.9 26.4
Short-Term Debt 49.4 87.9
Energy Supply Obligations 13.8 24.5
Current Deferred Income Taxes 13.4 9.0
Taxes Payable 0.7 1.0
Other Current Liabilities 16.7 17.5
Total Current Liabilities 125.4 166.8
Noncurrent Liabilities:    
Energy Supply Obligations 3.3 4.2
Noncurrent Deferred Income Taxes 38.7 37.3
Cost of Removal Obligations 51.4 46.5
Retirement Benefit Obligations 103.7 91.2
Environmental Obligations 13.8 14.5
Other Noncurrent Liabilities 2.4 4.7
Total Noncurrent Liabilities 213.3 198.4
TOTAL CAPITALIZATION AND LIABILITIES $ 886.6 $ 846.7