Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2013

Regulatory Matters [Abstract]

Regulatory Assets and Liabilities [Table Text Block]

Regulatory Assets and Liabilities	March 31, 2013		December 31, 2012
Millions
Current Regulatory Assets (a)
Deferred Fuel		$18.5		$22.5
Total Current Regulatory Assets	18.5		22.5
Non-Current Regulatory Assets
Future Benefit Obligations Under
Defined Benefit Pension and Other Postretirement Benefit Plans	256.1		260.7
Income Taxes	34.5		36.0
Asset Retirement Obligation	12.8		12.1
Cost Recovery Riders (b)	24.1		18.5
PPACA Income Tax Deferral	5.0		5.0
Conservation Improvement Program	0.4		4.3
Other	3.7		3.7
Total Non-Current Regulatory Assets	336.6		340.3
Total Regulatory Assets		$355.1		$362.8
Non-Current Regulatory Liabilities
Income Taxes		$18.3		$19.5
Plant Removal Obligations	18.6		18.1
Wholesale and Retail Contra AFUDC	16.0		15.5
Other	6.3		7.0
Total Non-Current Regulatory Liabilities		$59.2		$60.1

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

(b) The cost recovery rider regulatory asset is primarily due to capital expenditures related to our Bison Wind Energy Center.