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Regulatory Matters (Tables) | 6 Months Ended
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Jun. 30, 2011
Regulatory Matters [Abstract] |
Schedule of Regulatory Assets and Liabilities |
| June 30, | December 31,
Regulatory Assets and Liabilities | 2011 | 2010
Millions |  |
Current Regulatory Assets (a) |  |
Deferred Fuel | $15.0 | $20.6
Total Current Regulatory Assets | 15.0 | 20.6
Non-Current Regulatory Assets |  |
Future Benefit Obligations Under |  |
Defined Benefit Pension and Other Postretirement Benefit Plans | 249.5 | 257.9
Boswell Unit 3 Environmental Rider | - | 20.5
Income Taxes | 22.1 | 17.3
Asset Retirement Obligation | 8.7 | 7.8
Medicare Part D | 5.0 | -
Premium on Reacquired Debt | 1.7 | 1.8
Rate Case Expenses | 1.0 | 1.4
Other | 2.2 | 3.5
Total Non-Current Regulatory Assets | 290.2 | 310.2
Total Regulatory Assets | $305.2 | $330.8
Non-Current Regulatory Liabilities |  |
Income Taxes | $22.2 | $23.4
Plant Removal Obligations | 16.4 | 16.9
Other | 4.8 | 3.3
Total Non-Current Regulatory Liabilities | $43.4 | $43.6
(a) | Current regulatory assets are included in prepayments and other on the consolidated balance sheet.

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- Definition 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. + Details
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