Regulatory Matters (Tables)

9 Months Ended

Sep. 30, 2013

Regulatory Matters [Abstract]

Regulatory Assets and Liabilities [Table Text Block]

Regulatory Assets and Liabilities	September 30, 2013		December 31, 2012
Millions
Current Regulatory Assets (a)
Deferred Fuel		$22.8		$22.5
Total Current Regulatory Assets	22.8		22.5
Non-Current Regulatory Assets
Future Benefit Obligations Under
Defined Benefit Pension and Other Postretirement Benefit Plans	247.0		260.7
Income Taxes	34.4		36.0
Asset Retirement Obligations	14.9		12.1
Cost Recovery Riders (b)	35.5		18.5
PPACA Income Tax Deferral	5.0		5.0
Conservation Improvement Program	—		4.3
Other	3.5		3.7
Total Non-Current Regulatory Assets	340.3		340.3
Total Regulatory Assets		$363.1		$362.8
Non-Current Regulatory Liabilities
Income Taxes		$17.7		$19.5
Plant Removal Obligations	20.4		18.1
Wholesale and Retail Contra AFUDC	17.7		15.5
Conservation Improvement Program	5.8		—
Other	7.1		7.0
Total Non-Current Regulatory Liabilities		$68.7		$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.