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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2013
Regulatory Matters [Abstract] |
Regulatory Assets and Liabilities [Table Text Block] |
Regulatory Assets and Liabilities |  |
As of December 31 | 2013 |  | 2012 |
Millions |  |
Current Regulatory Assets (a) |  |
Deferred Fuel |  | $23.0 |  |  | $22.5 |
Total Current Regulatory Assets | 23.0 |  | 22.5 |
Non-Current Regulatory Assets |  |
Future Benefit Obligations Under |  |
Defined Benefit Pension and Other Postretirement Plans (b) | 164.1 |  | 260.7 |
Income Taxes | 35.3 |  | 36.0 |
Asset Retirement Obligation | 16.0 |  | 12.1 |
Cost Recovery Riders (c) | 39.6 |  | 18.5 |
PPACA Income Tax Deferral | 5.0 |  | 5.0 |
Conservation Improvement Program | — |  | 4.3 |
Other | 3.8 |  | 3.7 |
Total Non-Current Regulatory Assets | 263.8 |  | 340.3 |
Total Regulatory Assets |  | $286.8 |  |  | $362.8 |
Non-Current Regulatory Liabilities |  |
Income Taxes |  | $17.0 |  |  | $19.5 |
Plant Removal Obligations | 19.7 |  | 18.1 |
Wholesale and Retail Contra AFUDC | 19.7 |  | 15.5 |
Defined Benefit Pension and Other Postretirement Plans (b) | 16.3 |  | — |
Other | 8.3 |  | 7.0 |
Total Non-Current Regulatory Liabilities |  | $81.0 |  |  | $60.1 |
(a) | Current regulatory assets are included in Prepayments and Other on the Consolidated Balance Sheet.
(b) | Defined benefit pension and other postretirement items included in our Regulated Operations, which are otherwise required to be recognized in accumulated other comprehensive income, are recognized as regulatory assets or regulatory liabilities on our Consolidated Balance Sheet (See Note 17. Pension and Other Postretirement Benefit Plans).
(c) | The cost recovery rider regulatory asset is primarily due to capital expenditures related to our Bison Wind Energy Center and is recognized in accordance with the accounting standards for alternative revenue programs.

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- Definition Schedule of Regulatory Assets and Liabilities [Table Text Block] + References No definition available. + Details
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