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Operations and Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Inventories [Abstract] |  |  |  |  |
Fuel | $ 22.4 |  |  | $ 28.0 |
Materials and Supplies | 41.9 |  |  | 41.8 |
Total Inventories | 64.3 |  |  | 69.8 |
Prepayments and Other Current Assets [Abstract] |  |  |  |  |
Deferred Fuel Adjustment Clause | 18.5 |  |  | 22.5 |
Other | 9.6 |  |  | 11.1 |
Total Prepayments and Other Current Assets | 28.1 |  |  | 33.6 |
Other Current Liabilites [Abstract] |  |  |  |  |
Customer Deposits | 28.4 | [1] |  | 28.8 | [1]
Other | 29.4 |  |  | 33.8 |
Total Other Current Liabilities | 57.8 |  |  | 62.6 |
Other Non-Current Liabilities [Abstract] |  |  |  |  |
Asset Retirement Obligation | 80.6 |  |  | 77.9 |
Other | 46.1 |  |  | 45.4 |
Total Other Non-Current Liabilities | 126.7 |  |  | 123.3 |
Supplemental Statement of Cash Flows Information [Abstract] |  |  |  |  |
Cash Paid During the Period for Interest - Net of Amounts Capitalized | 12.0 |  | 12.3 |  |
Cash Paid During the Period for Income Taxes | 0.5 |  | 0.2 |  |
Noncash Investing and Financing Activities [Abstract] |  |  |  |  |
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment | (26.2) |  | (12.3) |  |
Capitalized Asset Retirement Costs | 1.9 |  | 2.4 |  |
AFUDC - Equity | $ 1.1 |  | $ 0.8 |  |
[1] | Customer deposits are primarily due to security deposits for capital expenditures relating to a transmission project.

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