Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2012

Regulatory Matters [Abstract]

Regulatory Assets and Liabilities [Table Text Block]

Regulatory Assets and Liabilities	March 31, 2012		December 31, 2011
Millions
Current Regulatory Assets (a)
Deferred Fuel		$15.5		$17.5
Total Current Regulatory Assets	15.5		17.5
Non-Current Regulatory Assets
Future Benefit Obligations Under
Defined Benefit Pension and Other Postretirement Benefit Plans	287.4		292.8
Income Taxes	28.5		28.6
Asset Retirement Obligation	10.3		9.8
PPACA Income Tax Deferral	5.0		5.0
Conservation Improvement Program	2.4		4.6
Other	5.7		5.1
Total Non-Current Regulatory Assets	339.3		345.9
Total Regulatory Assets		$354.8		$363.4
Non-Current Regulatory Liabilities
Income Taxes		$21.2		$21.9
Plant Removal Obligations	15.9		15.0
Other	8.2		6.6
Total Non-Current Regulatory Liabilities		$45.3		$43.5

(a) Current regulatory assets are included in prepayments and other on the consolidated balance sheet.