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Income Taxes - Tax Cuts and Jobs Act (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 22, 2017 | Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effect of Tax Cuts and Jobs Act of 2017 Accounting Incomplete Provisional [Abstract] |  |  |  |  |
U.S. Federal statutory tax rate | 35.00% |  | 34.00% | 34.00% | 34.00%
Tax benefit related to remeasurement |  |  | $ (15.2) |  |
Valuation allowance offset to remeasurement tax benefit |  |  | $ 15.2 |  |
Scenario, Forecast [Member] |  |  |  |  |
Effect of Tax Cuts and Jobs Act of 2017 Accounting Incomplete Provisional [Abstract] |  |  |  |  |
U.S. Federal statutory tax rate |  | 21.00% |  |  |

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- Definition Amount of reasonable estimate for the increase (decrease) in income tax expense (benefit) attributable to the increase (decrease) in the valuation allowance for remeasurement of deferred tax from change in tax rate pursuant to the Tax Cut And Jobs Act of 2017 for which accounting is incomplete. + References No definition available. + Details
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- Definition Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + 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=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: 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=84230637&loc=d3e32698-109319 + Details
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