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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Benefit due to release of valuation allowance on certain foreign deferred tax assets (net operating losses) as a result of indemnification of additional source of taxable income available in prior periods | $ 6.6 |
Tax benefit due to release of a portion of valuation allowance previously offsetting deferred tax assets associated with existing AMT credit carryforwards |  | $ 21.1

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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment 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. + 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 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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