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Income Tax Expense (Tables) | 6 Months Ended
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Jun. 30, 2013
Income Tax Expense [Abstract] |
Income Tax Expense [Table Text Block] |
|  | Quarter Ended |  | Six Months Ended
|  | June 30, |  | June 30,
|  | 2013 |  | 2012 |  | 2013 |  | 2012
Millions |  |  |  |  |  |  |  |
Current Tax Expense (Benefit) |  |  |  |  |  |  |  |
Federal (a) |  | $(0.2) |  | — |  |  | — |  |  | — |
State (a) |  | — |  |  | — |  |  | — |  |  | — |
Total Current Tax Expense (Benefit) |  | (0.2 | ) |  | — |  |  | — |  |  | — |
Deferred Tax Expense (Benefit) |  |  |  |  |  |  |  |
Federal |  | 3.6 |  |  |  | $4.8 |  |  |  | $8.2 |  |  |  | $13.2 |
State (b) |  | 0.9 |  |  | 0.2 |  |  | 3.8 |  |  | 0.3 |
Investment Tax Credit Amortization |  | (0.2 | ) |  | (0.2 | ) |  | (0.4 | ) |  | (0.4 | )
Total Deferred Tax Expense |  | 4.3 |  |  | 4.8 |  |  | 11.6 |  |  | 13.1 |
Total Income Tax Expense |  |  | $4.1 |  |  |  | $4.8 |  |  |  | $11.6 |  |  |  | $13.1 |
(a) | We incurred net operating losses (NOLs) due to the bonus depreciation provisions of the American Taxpayer Relief Act of 2012 and the Tax Relief Unemployment Insurance Reauthorization and Job Creation Act of 2010 for the quarter and six months ended June 30, 2013 and 2012. The 2013 and 2012 federal and state NOLs will be carried forward to offset future taxable income.
(b) | The quarter and six months ended June 30, 2012, reflected increased state tax benefit from state renewable tax credits compared to the quarter and six months ended June 30, 2013.

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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