Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2012

Regulatory Matters [Abstract]

Regulatory Assets and Liabilities [Table Text Block]

Regulatory Assets and Liabilities
As of December 31	2012		2011
Millions
Current Regulatory Assets (a)
Deferred Fuel		$22.5		$17.5
Total Current Regulatory Assets	22.5		17.5
Non-Current Regulatory Assets
Future Benefit Obligations Under
Defined Benefit Pension and Other Postretirement Plans	260.7		292.8
Income Taxes	36.0		28.6
Asset Retirement Obligation	12.1		9.8
Cost Recovery Riders (b)	18.5		0.7
PPACA Income Tax Deferral	5.0		5.0
Conservation Improvement Program	4.3		4.6
Other	3.7		4.4
Total Non-Current Regulatory Assets	340.3		345.9
Total Regulatory Assets		$362.8		$363.4
Non-Current Regulatory Liabilities
Income Taxes		$19.5		$21.9
Plant Removal Obligations	18.1		15.0
Wholesale and Retail Contra AFUDC	15.5		1.5
Other	7.0		5.1
Total Non-Current Regulatory Liabilities		$60.1		$43.5

(a) Current regulatory assets are included in prepayments and other on our Consolidated Balance Sheet.

(b) The increase in cost recovery rider regulatory assets in 2012 is primarily due to revenues related to our Bison Wind Energy Center.