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Income Taxes Income Taxes narrative (TCJA details) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Tax Cuts and Jobs Act Of 2017, provisional tax expense | $ 5,100,000 | $ 95,600,000
Tax Cuts and Jobs Act of 2017, provisional decrease to deferred tax assets | (1,500,000) | 15,000,000.0
Tax Cuts and Jobs Act Of 2017, provisional transition tax obligation | 5,400,000 | 49,900,000
Tax Cuts and Jobs Act Of 2017, provisional liability for withholding tax | 1,600,000 | 23,700,000
Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Foreign Tax Credit, Provisional Income Tax Expense | $ (600,000) | $ 7,000,000.0

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- Definition Amount of reasonable estimate for income tax expense for which accounting for tax effect from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated is incomplete pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2A -Subparagraph (SAB Topic 5.EE.Q2(b)) -URI http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817 + Details
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