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Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2011

Regulatory Matters [Abstract]

Regulatory Assets and Liabilities [Text Block]

Note 5. Regulatory Matters (Continued)

Regulatory Assets and Liabilities
As of December 31	2011				2010
Millions
Current Regulatory Assets (a)
Deferred Fuel		$17.5				$20.6
Total Current Regulatory Assets	17.5				20.6
Non-Current Regulatory Assets
Future Benefit Obligations Under
Defined Benefit Pension and Other Postretirement Plans	292.8				257.9
Boswell Unit 3 Environmental Rider	—				20.5
Income Taxes	28.6				17.3
Asset Retirement Obligation	9.8				7.8
PPACA Income Tax Deferral	5.0				—
Conservation Improvement Program	4.6				0.7
Other	5.1				6.0
Total Non-Current Regulatory Assets	345.9				310.2
Total Regulatory Assets		$363.4				$330.8
Non-Current Regulatory Liabilities
Income Taxes		$21.9				$23.4
Plant Removal Obligations	15.0				16.9
Other	6.6				3.3
Total Non-Current Regulatory Liabilities		$43.5				$43.6

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

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The entire disclosure for detailed information about regulatory assets and liabilities, including current and noncurrent assets created when regulatory agencies permit the deferral of costs to the balance sheet that would otherwise be required to appear on the company's income statement and would be charged against current expenses or revenues, as well as current and noncurrent liabilities created when regulatory agencies permit.

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