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Income Taxes (Narrative) (Details) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 USD ($) generator | Jun. 30, 2018 | Jun. 30, 2019 generator | Jun. 30, 2018 | Dec. 31, 2018 USD ($)
Income Tax Credits [Line Items] |  |  |  |  |
Effective tax rate (as a percent) | 32.60% | 12.50% | 24.80% | 12.10% |
DC Solar Tax Credit Investments |  |  |  |  |
Income Tax Credits [Line Items] |  |  |  |  |
Reversal of certain previously claimed tax credits | $ 30.1 |  |  |  |
Investment tax credits |  |  |  |  | $ 53.9
Deferred tax liability |  |  |  |  | $ 5.7
Tax basis reduction (as a percent) |  |  |  |  | 50.00%
Tax credit claimed, net of tax basis reduction |  |  |  |  | $ 48.2
Amount reversed of previously claimed tax credit | 33.6 |  |  |  |
Amount reversed of deferred tax liability | $ 3.5 |  |  |  |
Number of mobile service generators identified | generator | 0 |  | 0 |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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