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Income Tax Expense (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Income Tax Expense [Table Text Block] |
Income Tax Expense |  |  |
Year Ended December 31 | 2018 |  | 2017 |  | 2016 |
Millions |  |  |
Current Income Tax Expense (a) |  |  |
Federal | — |  | — |  | — |
State | $0.3 | $0.3 | $0.4
Total Current Income Tax Expense |  | $0.3 |  |  | $0.3 |  |  | $0.4 |
Deferred Income Tax Expense (Benefit) |  |  |
Federal (b) | $(26.2) |  | $12.1 |  |  | $12.0 |
Federal – Remeasurement of Deferred Income Taxes (c) | — |  | (13.0 | ) | — |
State | 11.0 |  | 15.8 |  | 8.1 |
Investment Tax Credit Amortization | (0.6 | ) | (0.5 | ) | (0.7 | )
Total Deferred Income Tax Expense (Benefit) | $(15.8) |  | $14.4 |  |  | $19.4 |
Total Income Tax Expense (Benefit) | $(15.5) |  | $14.7 |  |  | $19.8 |
(a) | For the years ended December 31, 2018, 2017 and 2016, 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. Federal and state NOLs are being carried forward to offset current and future taxable income.
(b) | For the year ended December 31, 2018, the federal tax benefit is primarily due to production tax credits, and the reduction of the federal statutory tax rate from 35 percent to 21 percent enacted as part of the TCJA.
(c) | For the year ended December 31, 2017, the federal deferred income tax benefit is due to the remeasurement of deferred income tax assets and liabilities resulting from the TCJA.
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 | 2018 |  | 2017 |  | 2016 |
Millions |  |  |
Income Before Non-Controlling Interest and Income Taxes |  | $158.6 |  |  | $186.9 |  |  | $175.6 |
Statutory Federal Income Tax Rate | 21 | % | 35 | % | 35 | %
Income Taxes Computed at Statutory Federal Rate |  | $33.3 |  |  | $65.4 |  |  | $61.5 |
Increase (Decrease) in Tax Due to: |  |  |
State Income Taxes – Net of Federal Income Tax Benefit | 8.9 |  | 10.5 |  | 5.6 |
Production Tax Credits | (45.0 | ) | (45.1 | ) | (41.5 | )
Regulatory Differences – Excess Deferred Tax Benefit (a) | (8.2 | ) | 1.2 |  | 1.4 |
Change in Fair Value of Contingent Consideration | (0.4 | ) | — |  | (3.8 | )
Remeasurement of Deferred Income Taxes (b) | — |  | (13.0 | ) | — |
Other | (4.1 | ) | (4.3 | ) | (3.4 | )
Total Income Tax Expense (Benefit) | $(15.5) |  | $14.7 |  |  | $19.8 |
(a) | Excess deferred income taxes are being returned to customers under both the Average Rate Assumption Method and amortization periods as approved by regulators. (See Note 4. Regulatory Matters.)
(b) | Deferred income tax benefit from the remeasurement of deferred income tax assets and liabilities resulting from the TCJA.
Deferred Tax Assets and Liabilities [Table Text Block] |
Deferred Income Tax Assets and Liabilities |  |
As of December 31 | 2018 |  | 2017 |
Millions |  |
Deferred Income Tax Assets |  |
Employee Benefits and Compensation |  | $62.2 |  |  | $65.9 |
Property-Related | 95.2 |  | 104.3 |
NOL Carryforwards | 86.1 |  | 99.1 |
Tax Credit Carryforwards | 349.8 |  | 294.3 |
Power Sales Agreements | 27.5 |  | 35.0 |
Regulatory Liabilities | 113.4 |  | 117.7 |
Other | 25.1 |  | 33.3 |
Gross Deferred Income Tax Assets | 759.3 |  | 749.6 |
Deferred Income Tax Asset Valuation Allowance | (66.5 | ) | (60.0 | )
Total Deferred Income Tax Assets |  | $692.8 |  |  | $689.6 |
Deferred Income Tax Liabilities |  |
Property-Related |  | $752.5 |  |  | $758.3 |
Regulatory Asset for Benefit Obligations | 61.0 |  | 61.4 |
Unamortized Investment Tax Credits | 32.2 |  | 32.8 |
Partnership Basis Differences | 40.8 |  | 34.9 |
Regulatory Assets | 29.9 |  | 32.0 |
Other | — |  | 0.7 |
Total Deferred Income Tax Liabilities |  | $916.4 |  |  | $920.1 |
Net Deferred Income Taxes (a) |  | $223.6 |  |  | $230.5 |
(a) | Recorded as a net long-term Deferred Income Tax liability on the Consolidated Balance Sheet
NOL and Tax Credit Carryforwards [Table Text Block] |
NOL and Tax Credit Carryforwards |  |
As of December 31 | 2018 | 2017 |
Millions |  |
Federal NOL Carryforwards (a) | $319.0 |  | $375.2 |
Federal Tax Credit Carryforwards | $256.4 | $209.2
State NOL Carryforwards (a) | $305.8 | $289.9
State Tax Credit Carryforwards (b) | $27.4 | $25.6
(a) | Pre-tax amounts.
(b) | Net of a $66.0 million valuation allowance as of December 31, 2018 ($59.5 million as of December 31, 2017).
Gross Unrecognized Income Tax Benefits [Table Text Block] |
Gross Unrecognized Income Tax Benefits | 2018 |  | 2017 |  | 2016 |
Millions |  |  |
Balance at January 1 |  | $1.7 |  |  | $2.0 |  |  | $2.4 |
Additions for Tax Positions Related to the Current Year | 0.1 |  | 0.1 |  | 0.1 |
Additions for Tax Positions Related to Prior Years | 0.1 |  | 0.1 |  | 0.2 |
Reductions for Tax Positions Related to Prior Years | (0.2 | ) | (0.1 | ) | (0.3 | )
Lapse of Statute | (0.1 | ) | (0.4 | ) | (0.4 | )
Balance as of December 31 |  | $1.6 |  |  | $1.7 |  |  | $2.0 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for 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 and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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