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Income Tax Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Current Income Tax Expense [Abstract] |  |  |  |
Federal | [1] | $ 0.0 | $ 0.0 | $ 0.0
State | [1] | 0.0 | 0.0 | 0.1
Total Current Income Tax Expense | [1] | 0.0 | 0.0 | 0.1
Deferred Income Tax Expense (Benefit) [Abstract] |  |  |  |
Federal | [2] | (37.2) | (48.8) | (27.8)
State |  | 10.8 | 9.8 | 21.7
Investment Tax Credit Amortization |  | (0.5) | (0.5) | (0.6)
Total Deferred Income Tax Expense (Benefit) |  | (26.9) | (39.5) | (6.7)
Total Income Tax Expense (Benefit) |  | $ (26.9) | $ (39.5) | $ (6.6)
[1] | For the years ended December 31, 2021, 2020 and 2019, the federal and state current tax expense was minimal due to NOLs which resulted from the bonus depreciation and related tax attributes from large wind projects. Federal and state NOLs are being carried forward to offset current and future taxable income.
[2] | For the years ended December 31, 2021, 2020 and 2019, the federal tax benefit is primarily due to production tax credits.

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- Definition Amount of current income tax expense (benefit) pertaining to taxable income (loss) 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 S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)(Note 1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.2) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 + Details
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