XML 81 R34.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Income Tax Expense (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2015
Income Tax Expense [Abstract] |
Income Tax Expense [Table Text Block] |
|  | Quarter Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Millions |  |  |  |  |  |  |  |
Current Tax Expense |  |  |  |  |  |  |  |
Federal (a) |  | — |  |  | — |  |  | — |  |  | — |
State (a) (b) |  | $0.2 |  | $1.8 |  |  | $0.5 |  |  | $1.9
Total Current Tax Expense |  | $0.2 |  | $1.8 |  |  | $0.5 |  |  | $1.9
Deferred Tax Expense (Benefit) |  |  |  |  |  |  |  |
Federal |  | $14.8 |  |  | $11.2 |  |  | $23.5 |  |  | $20.4 |
State |  | (0.4 | ) |  | 0.7 |  |  | 3.6 |  |  | 5.4 |
Investment Tax Credit Amortization |  | (0.2 | ) |  | (0.3 | ) |  | (0.6 | ) |  | (0.6 | )
Total Deferred Tax Expense |  | 14.2 |  |  | 11.6 |  |  | 26.5 |  |  | 25.2 |
Total Income Tax Expense |  | $14.4 |  |  | $13.4 |  |  | $27.0 |  |  | $27.1 |
(a) | For the quarter and nine months ended September 30, 2015, the federal and state current tax expense was minimal due to the utilization of NOL carryforwards from prior periods. The NOL carryforwards resulted from the bonus depreciation provisions of the Tax Increase Prevention Act of 2014 and the American Taxpayer Relief Act of 2012.
(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 2015 will be carried forward to offset future income.
Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense [Table Text Block] |
Reconciliation of Taxes from Federal Statutory |  |
Rate to Total Income Tax Expense |  |
Nine Months Ended September 30 | 2015 |  | 2014 |
Millions |  |
Income Before Non-Controlling Interest and Income Taxes |  | $149.7 |  |  | $119.4 |
Statutory Federal Income Tax Rate | 35 | % | 35 | %
Income Taxes Computed at 35 percent Statutory Federal Rate | 52.4 |  | 41.8 |
Increase (Decrease) in Tax Due to: |  |
State Income Taxes – Net of Federal Income Tax Benefit | 2.6 |  | 4.8 |
Production Tax Credits | (27.0 | ) | (16.4 | )
Regulatory Differences for Utility Plant | (0.7 | ) | (2.1 | )
Other | (0.3 | ) | (1.0 | )
Total Income Tax Expense |  | $27.0 |  |  | $27.1 |

X
- Definition Income Tax Expense [Abstract] + References No definition available. + Details
Name: | ale_IncomeTaxExpenseAbstract
Namespace Prefix: | ale_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
Name: | us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration