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Operations and Significant Accounting Policies (Tables) | 6 Months Ended
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Jun. 30, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Inventories |
| June 30, | December 31,
Inventories | 2011 | 2010
Millions |  |
Fuel | $23.5 | $22.9
Materials and Supplies | 37.8 | 37.1
Total Inventories | $61.3 | $60.0
Prepayments and Other Current Assets |
| June 30, | December 31,
Prepayments and Other Current Assets | 2011 | 2010
Millions |  |
Deferred Fuel Adjustment Clause | $15.0 | $20.6
Other | 5.6 | 8.0
Total Prepayments and Other Current Assets | $20.6 | $28.6
Other Non-Current Liabilities |
| June 30, | December 31,
Other Non-Current Liabilities | 2011 | 2010
Millions |  |
Asset Retirement Obligation | $52.0 | $50.3
Other | 48.9 | 43.1
Total Other Non-Current Liabilities | $100.9 | $93.4
Supplemental Statement of Cash Flows Information | Supplemental Statement of Cash Flows Information.
For the Six Months Ended June 30, | 2011 | 2010
Millions |  |
Cash Paid During the Period for Interest - Net of Amounts Capitalized | $21.9 | $16.3
Cash Paid During the Period for Income Taxes | $0.4 | $1.5
Noncash Investing and Financing Activities |  |
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment | $(13.2) | $4.4
AFUDC - Equity | $1.1 | $2.1

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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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