Operations and Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2011

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Inventories [Table Text Block]

Inventories	September 30, 2011	December 31, 2010
Millions
Fuel	$28.5	$22.9
Materials and Supplies	40.6	37.1
Total Inventories	$69.1	$60.0

Prepayments and Other Current Assets [Table Text Block]

Prepayments and Other Current Assets	September 30, 2011	December 31, 2010
Millions
Deferred Fuel Adjustment Clause	$17.1	$20.6
Other	5.7	8.0
Total Prepayments and Other Current Assets	$22.8	$28.6

Other Current and Non-Current Liabilities [Table Text Block]

Other Current Liabilities	September 30, 2011	December 31, 2010
Millions
Customer Deposits	$7.1	$2.9
Other	19.1	30.8
Total Other Current Liabilities	$26.2	$33.7

Other Non-Current Liabilities	September 30, 2011	December 31, 2010
Millions
Asset Retirement Obligation	$52.7	$50.3
Other	49.2	43.1
Total Other Non-Current Liabilities	$101.9	$93.4

Supplemental Statement of Cash Flows Information [Table Text Block]

Supplemental Statement of Cash Flows Information.

For the Nine Months Ended September 30,	2011	2010
Millions
Cash Paid During the Period for Interest – Net of Amounts Capitalized	$32.4	$26.1
Cash Received During the Period for Income Taxes	$(11.1)	$(29.4)
Noncash Investing and Financing Activities
Increase (Decrease) in Accounts Payable for Capital Additions to Property, Plant and Equipment	$(14.8)	$0.7
AFUDC – Equity	$1.7	$3.4