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Operations and Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Inventories [Abstract] |  |  |  |  |
Fuel | $ 25.3 |  | $ 25.3 |  | $ 28.0
Materials and Supplies | 45.7 |  | 45.7 |  | 41.8
Total Inventories | 71.0 |  | 71.0 |  | 69.8
Prepayments and Other Current Assets [Abstract] |  |  |  |  |
Deferred Fuel Adjustment Clause | 18.3 |  | 18.3 |  | 22.5
Other | 7.9 |  | 7.9 |  | 11.1
Total Prepayments and Other Current Assets | 26.2 |  | 26.2 |  | 33.6
Other Current Liabilites [Abstract] |  |  |  |  |
Customer Deposits | 29.1 |  | 29.1 |  | 28.8
Other | 31.7 |  | 31.7 |  | 33.8
Total Other Current Liabilities | 60.8 |  | 60.8 |  | 62.6
Other Non-Current Liabilities [Abstract] |  |  |  |  |
Asset Retirement Obligation | 81.6 |  | 81.6 |  | 77.9
Other | 47.7 |  | 47.7 |  | 45.4
Total Other Non-Current Liabilities | 129.3 |  | 129.3 |  | 123.3
Supplemental Statement of Cash Flows Information [Abstract] |  |  |  |  |
Cash Paid During the Period for Interest - Net of Amounts Capitalized |  |  | 22.8 | 21.7 |
Cash Paid During the Period for Income Taxes |  |  | 0.6 | 0.2 |
Noncash Investing and Financing Activities [Abstract] |  |  |  |  |
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment |  |  | 28.2 | 14.8 |
Capitalized Asset Retirement Costs |  |  | 1.9 | 2.4 |
AFUDC - Equity | $ 1.0 | $ 1.2 | $ 2.1 | $ 1.9 |

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