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Income Tax Expense (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Income Tax Expense [Table Text Block] |
Income Tax Expense |  |  |
Year Ended December 31 | 2015 |  | 2014 |  | 2013 |
Millions |  |  |
Current Tax Expense |  |  |
Federal (a) | — |  | $1.1 | — |
State (a) | $0.2 | 2.9 | $0.1
Total Current Tax Expense | 0.2 |  | 4.0 |  | 0.1 |
Deferred Tax Expense |  |  |
Federal | 19.4 |  | 25.3 |  | 22.9 |
State | 6.5 |  | 8.2 |  | 6.5 |
Investment Tax Credit Amortization | (0.8 | ) | (0.8 | ) | (0.8 | )
Total Deferred Tax Expense | 25.1 |  | 32.7 |  | 28.6 |
Total Income Tax Expense |  | $25.3 |  |  | $36.7 |  |  | $28.7 |
(a) | For the years ended December 31, 2015, 2014, and 2013, the federal and state current tax expense was minimal due to NOLs which resulted from the bonus depreciation provisions of the Protecting Americans from Tax Hikes Act of 2015, the Tax Increase Prevention Act of 2014 and the American Taxpayer Relief Act of 2012. The federal and state NOLs will be carried forward to offset future taxable income. The year ended December 31, 2014 includes the resolution of an Internal Revenue Service examination for tax years 2005 through 2009 and the impacts of initiatives implemented on the 2013 federal and state tax returns to utilize tax carryforwards that may have expired.
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 |  |  |
Year Ended December 31 | 2015 |  | 2014 |  | 2013 |
Millions |  |  |
Income Before Non-Controlling Interest and Income Taxes |  | $166.8 |  |  | $162.2 |  |  | $133.4 |
Statutory Federal Income Tax Rate | 35 | % | 35 | % | 35 | %
Income Taxes Computed at 35 percent Statutory Federal Rate |  | $58.4 |  |  | $56.8 |  |  | $46.7 |
Increase (Decrease) in Tax Due to: |  |  |
State Income Taxes – Net of Federal Income Tax Benefit | 4.4 |  | 7.2 |  | 4.3 |
Regulatory Differences for Utility Plant | (0.6 | ) | (3.5 | ) | (2.2 | )
Production Tax Credits | (37.0 | ) | (23.7 | ) | (19.2 | )
Other | 0.1 |  | (0.1 | ) | (0.9 | )
Total Income Tax Expense |  | $25.3 |  |  | $36.7 |  |  | $28.7 |
Deferred Tax Assets and Liabilities [Table Text Block] |
Deferred Tax Assets and Liabilities |  |
As of December 31 | 2015 |  | 2014 |
Millions |  |
Deferred Tax Assets |  |
Employee Benefits and Compensation |  | $105.4 |  |  | $102.2 |
Property Related | 126.6 |  | 102.7 |
NOL Carryforwards | 186.4 |  | 156.5 |
Tax Credit Carryforwards | 164.8 |  | 95.7 |
Power Purchase Agreements | 73.0 |  | 51.8 |
Other | 21.8 |  | 17.0 |
Gross Deferred Tax Assets | 678.0 |  | 525.9 |
Deferred Tax Asset Valuation Allowance | (31.6 | ) | (22.1 | )
Total Deferred Tax Assets |  | $646.4 |  |  | $503.8 |
Deferred Tax Liabilities |  |
Property Related |  | $1,053.0 |  |  | $848.8 |
Regulatory Asset for Benefit Obligations | 89.4 |  | 89.9 |
Unamortized Investment Tax Credits | 26.0 |  | 10.3 |
Partnership Basis Differences | 47.8 |  | 41.9 |
Other | 10.0 |  | 16.1 |
Total Deferred Tax Liabilities |  | $1,226.2 |  |  | $1,007.0 |
Net Deferred Income Taxes |  | $579.8 |  |  | $503.2 |
Recorded as: |  |
Net Current Deferred Tax Assets (a) | — |  | $7.5
Net Long-Term Deferred Tax Liabilities |  | $579.8 |  | 510.7 |
Net Deferred Income Taxes |  | $579.8 |  |  | $503.2 |
(a) | For discussion of classification of deferred income taxes see Note 1. Operations and Significant Accounting Policies - New Accounting Standards - Balance Sheet Classification of Deferred Taxes.
NOL and Tax Credit Carryforwards |  |
As of December 31 | 2015 | 2014 |
Millions |  |
Federal NOL Carryforwards (a) | $493.0 |  | $413.7 |
Federal Tax Credit Carryforwards | $113.6 | $59.3
State NOL Carryforwards (a) | $228.6 | $184.7
State Tax Credit Carryforwards (b) | $20.0 | $14.7
NOL and Tax Credit Carryforwards [Table Text Block] |
NOL and Tax Credit Carryforwards |  |
As of December 31 | 2015 | 2014 |
Millions |  |
Federal NOL Carryforwards (a) | $493.0 |  | $413.7 |
Federal Tax Credit Carryforwards | $113.6 | $59.3
State NOL Carryforwards (a) | $228.6 | $184.7
State Tax Credit Carryforwards (b) | $20.0 | $14.7
(a) | Pretax amounts.
(b) | Net of a $31.2 million valuation allowance as of December 31, 2015 ($21.7 million as of December 31, 2014).
Gross Unrecognized Income Tax Benefits [Table Text Block] |
Gross Unrecognized Income Tax Benefits | 2015 |  | 2014 |  | 2013 |
Millions |  |  |
Balance at January 1 |  | $2.0 |  |  | $1.2 |  |  | $2.7 |
Additions for Tax Positions Related to the Current Year | 0.5 |  | — |  | 0.1 |
Additions for Tax Positions Related to Prior Years | 0.7 |  | 1.0 |  | 1.3 |
Reductions for Tax Positions Related to Prior Years | (0.7 | ) | — |  | — |
Reductions for Settlements | — |  | — |  | (2.9 | )
Lapse of Statute | (0.1 | ) | (0.2 | ) | — |
Balance as of December 31 |  | $2.4 |  |  | $2.0 |  |  | $1.2 |

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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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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- 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
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- Definition Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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