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Income Tax Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Current Tax Expense [Abstract] |  |  |  |  |  |
Federal | [1] | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
State | [1] | 0.1 | 0.1 | 0.2 | 0.2 |
Total Current Tax Expense |  | 0.1 | 0.1 | 0.2 | 0.2 |
Deferred Tax Expense [Abstract] |  |  |  |  |  |
Federal |  | 3.8 | 2.1 | 11.1 | 6.7 |
State |  | 3.6 | 2.7 | 9.5 | 7.5 |
Investment Tax Credit Amortization |  | (0.2) | (0.2) | (0.4) | (0.4) |
Total Deferred Tax Expense |  | 7.2 | 4.6 | 20.2 | 13.8 |
Total Income Tax Expense |  | 7.3 | 4.7 | 20.4 | 14.0 |
Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense [Abstract] |  |  |  |  |  |
Income Before Non-Controlling Interest and Income Taxes |  | $ 44.2 | $ 29.5 | $ 106.3 | $ 85.2 |
Statutory Federal Income Tax Rate |  | 35.00% | 35.00% | 35.00% | 35.00% |
Income Taxes Computed at 35 percent Statutory Federal Rate |  | $ 15.5 | $ 10.3 | $ 37.2 | $ 29.8 |
Increase (Decrease) in Tax Due to: [Abstract] |  |  |  |  |  |
State Income Taxes – Net of Federal Income Tax Benefit |  | 2.4 | 1.8 | 6.3 | 5.0 |
Production Tax Credits |  | (10.0) | (6.6) | (23.0) | (20.5) |
Other |  | (0.6) | (0.8) | (0.1) | (0.3) |
Total Income Tax Expense |  | 7.3 | $ 4.7 | $ 20.4 | $ 14.0 |
Effective Tax Rate |  |  |  | 19.20% | 16.40% |
Uncertain Tax Positions [Abstract] |  |  |  |  |  |
Gross Unrecognized Tax Benefits |  | 1.9 |  | $ 1.9 |  | $ 2.0
Gross Unrecognized Tax Benefits That Would Favorably Impact Effective Income Tax Rate |  | $ 0.7 |  | $ 0.7 |  |
[1] | For the quarter and six months ended June 30, 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.

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 Reference 2: 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=65882285&loc=d3e32687-109319 + Details
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