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Operations and Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Inventories [Abstract] |  |  |  |  |
Fuel | $ 31.3 |  | $ 31.3 |  | $ 28.6
Materials and Supplies | 45.4 |  | 45.4 |  | 40.5
Total Inventories | 76.7 |  | 76.7 |  | 69.1
Prepayments and Other Current Assets [Abstract] |  |  |  |  |
Deferred Fuel Adjustment Clause | 18.2 |  | 18.2 |  | 17.5
Other | 5.6 |  | 5.6 |  | 9.6
Total Prepayments and Other Current Assets | 23.8 |  | 23.8 |  | 27.1
Other Current Liabilites [Abstract] |  |  |  |  |
Customer Deposits | 28.8 |  | 28.8 |  | 16.3
Other | 24.3 |  | 24.3 |  | 29.3
Total Other Current Liabilities | 53.1 |  | 53.1 |  | 45.6
Other Non-Current Liabilities [Abstract] |  |  |  |  |
Asset Retirement Obligation | 61.7 |  | 61.7 |  | 57.0
Other | 47.7 |  | 47.7 |  | 48.1
Total Other Non-Current Liabilities | 109.4 |  | 109.4 |  | 105.1
Supplemental Statement of Cash Flows Information [Abstract] |  |  |  |  |
Cash Paid During the Period for Interest - Net of Amounts Capitalized |  |  | 32.3 | 32.4 |
Cash Paid (Received) During the Period for Income Taxes |  |  | 0.2 | (11.1) |
Noncash Investing and Financing Activities [Abstract] |  |  |  |  |
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment |  |  | (13.1) | (14.8) |
AFUDC - Equity | 1.5 | 0.6 | 3.4 | 1.7 |
Accounts Receivable [Abstract] |  |  |  |  |
Pre-Bankruptcy Petition Receivable | $ 3.2 |  | $ 3.2 |  |

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