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Operations and Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2012
Operations and Significant Accounting Policies [Abstract] |
Inventories [Table Text Block] |
Inventories | March 31, 2012 |  | December 31, 2011
Millions |  |  |
Fuel | $31.8 |  | $28.6
Materials and Supplies | 40.4 |  | 40.5
Total Inventories | $72.2 |  | $69.1
Prepayments and Other Current Assets [Table Text Block] |
Prepayments and Other Current Assets | March 31, 2012 |  | December 31, 2011
Millions |  |  |
Deferred Fuel Adjustment Clause | $15.5 |  | $17.5
Other | 7.4 |  | 9.6
Total Prepayments and Other Current Assets | $22.9 |  | $27.1
Other Current and Non-Current Liabilities [Table Text Block] |
Other Current Liabilities | March 31, 2012 |  | December 31, 2011
Millions |  |  |
Customer Deposits | $21.3 |  | $16.3
Other | 20.5 |  | 29.3
Total Other Current Liabilities | $41.8 |  | $45.6
Other Non-Current Liabilities | March 31, 2012 |  | December 31, 2011
Millions |  |  |
Asset Retirement Obligation | $60.2 |  | $57.0
Other | 50.9 |  | 48.1
Total Other Non-Current Liabilities | $111.1 |  | $105.1
Supplemental Statement of Cash Flows Information [Table Text Block] | Supplemental Statement of Cash Flows Information.
For the Three Months Ended March 31, | 2012 |  | 2011
Millions |  |  |
Cash Paid During the Period for Interest – Net of Amounts Capitalized | $12.3 |  | $10.4
Cash Paid During the Period for Income Taxes | $0.2 |  | $0.2
Noncash Investing and Financing Activities |  |  |
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment | $(12.3) |  | $(14.4)
AFUDC – Equity | $0.8 |  | $0.6

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- Definition Tabular disclosure of the carrying amount as of the balance sheet date of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic -SubTopic -Publisher SEC -Number 210 -Article 5 -Subparagraph a,b,c -Name Regulation S-X (SX) -Paragraph 6 -Section 2 + Details
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