Operations and Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2013

Operations and Significant Accounting Policies [Abstract]

Inventories [Table Text Block]

Inventories	March 31, 2013		December 31, 2012
Millions
Fuel		$22.4		$28.0
Materials and Supplies	41.9		41.8
Total Inventories		$64.3		$69.8

Prepayments and Other Current Assets [Table Text Block]

Prepayments and Other Current Assets	March 31, 2013		December 31, 2012
Millions
Deferred Fuel Adjustment Clause		$18.5		$22.5
Other	9.6		11.1
Total Prepayments and Other Current Assets		$28.1		$33.6

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

Other Current Liabilities	March 31, 2013		December 31, 2012
Millions
Customer Deposits (a)		$28.4		$28.8
Other	29.4		33.8
Total Other Current Liabilities		$57.8		$62.6

(a) Customer deposits are primarily due to security deposits for capital expenditures relating to a transmission project.

Other Non-Current Liabilities	March 31, 2013		December 31, 2012
Millions
Asset Retirement Obligation		$80.6		$77.9
Other	46.1		45.4
Total Other Non-Current Liabilities		$126.7		$123.3

Supplemental Statement of Cash Flows Information [Table Text Block]

Supplemental Statement of Cash Flows Information.

For the Quarter Ended March 31,	2013		2012
Millions
Cash Paid During the Period for Interest – Net of Amounts Capitalized		$12.0		$12.3
Cash Paid During the Period for Income Taxes		$0.5	$0.2
Noncash Investing and Financing Activities
Decrease in Accounts Payable for Capital Additions to Property, Plant and Equipment	$(26.2)		$(12.3)
Capitalized Asset Retirement Costs		$1.9		$2.4
AFUDC – Equity		$1.1		$0.8