Operations and Significant Accounting Policies (Tables)

6 Months Ended

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