Regulatory Matters (Tables)

6 Months Ended

Jun. 30, 2012

Regulatory Matters [Abstract]

Regulatory Assets and Liabilities [Table Text Block]

Regulatory Assets and Liabilities	June 30, 2012		December 31, 2011
Millions
Current Regulatory Assets (a)
Deferred Fuel		$18.5		$17.5
Total Current Regulatory Assets	18.5		17.5
Non-Current Regulatory Assets
Future Benefit Obligations Under
Defined Benefit Pension and Other Postretirement Benefit Plans	282.0		292.8
Income Taxes	28.3		28.6
Asset Retirement Obligation	10.9		9.8
Current Cost Recovery Riders	5.9		0.7
PPACA Income Tax Deferral	5.0		5.0
Conservation Improvement Program	0.5		4.6
Other	4.3		4.4
Total Non-Current Regulatory Assets	336.9		345.9
Total Regulatory Assets		$355.4		$363.4
Non-Current Regulatory Liabilities
Income Taxes		$20.5		$21.9
Plant Removal Obligations	16.7		15.0
Wholesale and Retail Contra AFUDC	6.3		1.5
Other	5.8		5.1
Total Non-Current Regulatory Liabilities		$49.3		$43.5

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