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Operations and Significant Accounting Policies (Tables)

3 Months Ended

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