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Operations and Significant Accounting Policies (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Inventories [Abstract]     
Fuel$ 28.5 $ 28.5 $ 22.9
Materials and Supplies40.6 40.6 37.1
Total Inventories69.1 69.1 60.0
Prepayments and Other Current Assets [Abstract]     
Deferred Fuel Adjustment Clause17.1 17.1 20.6
Other5.7 5.7 8.0
Total Prepayments and Other Current Assets22.8 22.8 28.6
Other Current Liabilites [Abstract]     
Customer Deposits7.1 7.1 2.9
Other19.1 19.1 30.8
Total Other Current Liabilities26.2 26.2 33.7
Other Non-Current Liabilities [Abstract]     
Asset Retirement Obligation52.7 52.7 50.3
Other49.2 49.2 43.1
Total Other Non-Current Liabilities101.9 101.9 93.4
Supplemental Statement of Cash Flows Information [Abstract]     
Cash Paid During the Period for Interest - Net of Amounts Capitalized  32.426.1 
Cash Received During the Period for Income Taxes  (11.1)(29.4) 
Noncash Investing and Financing Activities [Abstract]     
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment  (14.8)0.7 
AFUDC - Equity0.61.41.73.4 
Accounts Receivable [Abstract]     
Pre-Bankruptcy Petition Receivable3.2 3.2  
Non-Controlling Interest [Abstract]     
Purchase of Non-Controlling Interest (Dollars)$ 9    
Purchase of Non-Controlling Interest (Shares)0.2