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Income Tax Expense (Tables) | 9 Months Ended
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Sep. 30, 2014
Income Tax Expense [Abstract] |
Income Tax Expense [Table Text Block] |
|  | Quarter Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Millions |  |  |  |  |  |  |  |
Current Tax Expense (Benefit) |  |  |  |  |  |  |  |
Federal (a)(c) |  | — |  |  | — |  |  | — |  |  | — |
State (b)(c) |  | $1.8 |  | $(0.1) |  | $1.9 |  | $(0.1)
Total Current Tax Expense (Benefit) |  | $1.8 |  | $(0.1) |  | $1.9 |  | $(0.1)
Deferred Tax Expense (Benefit) |  |  |  |  |  |  |  |
Federal |  |  | $11.2 |  |  |  | $7.3 |  |  |  | $20.4 |  |  |  | $15.5 |
State |  | 0.7 |  |  | 1.7 |  |  | 5.4 |  |  | 5.5 |
Investment Tax Credit Amortization |  | (0.3 | ) |  | (0.2 | ) |  | (0.6 | ) |  | (0.6 | )
Total Deferred Tax Expense |  | 11.6 |  |  | 8.8 |  |  | 25.2 |  |  | 20.4 |
Total Income Tax Expense |  |  | $13.4 |  |  |  | $8.7 |  |  |  | $27.1 |  |  |  | $20.3 |
(a) | For the quarter and nine months ended September 30, 2014, the federal current tax expense of zero reflected the utilization of NOL carryforwards from prior periods. The federal NOLs remaining after utilization in 2014 will be carried forward to offset future taxable income.
(b) | For the quarter and nine months ended September 30, 2014, the state current tax expense reflected initiatives implemented on the 2013 federal and state tax returns to utilize tax carryforwards that may have expired due to NOL carryforwards from prior periods. State NOL and alternative minimum tax carryforwards remaining after utilization in 2014 will be carried forward to offset future income.
(c) | For the quarter and nine months ended September 30, 2013, the state current tax benefit was due to federal and state NOLs which resulted from the bonus depreciation provision of the American Taxpayer Relief Act of 2012.

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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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