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Income Taxes (Details) - USD ($) $ in Billions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Oct. 01, 2017
Income Tax (Textuals) |  |  |
Worldwide effective income tax rate (as a percent) |  | 17.60% | 20.50%
Provisional tax cost | $ 13.0 |  |
Effective income tax rate adjustment business combination (as a percent) |  |  | 1.40%
Excess tax benefit from share based compensation |  | 1.20% | 2.10%
Accelerated deduction (as a percent) |  | 2.00% |
Estimated tax impact, foreign taxes (as a percent) |  | 2.50% |
Increase to the transition tax on undistributed foreign earnings |  | $ 0.1 |
Deferred tax liability foreign earnings |  | 0.3 |
Deferred tax assets offset |  | 0.2 |
Unrecognized tax benefits |  | $ 3.2 |
Foreign Tax Authority |  |  |
Income Tax (Textuals) |  |  |
Change in enacted rate (as a percent) |  | 2.50% |
Domestic Tax Authority |  |  |
Income Tax (Textuals) |  |  |
Change in enacted rate (as a percent) |  | 0.40% |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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