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Income Taxes - Tax Jurisdictions and Years Currently under Audit Exam (Details) | 3 Months Ended
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Dec. 31, 2018
UNITED STATES | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2015
UNITED STATES | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2016
BELGIUM | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2015
BELGIUM | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2017
CHINA | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2008
CHINA | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2016
France | Tax Year 2010 [Member] |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2010
France | Tax Year 2011 [Member] |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2011
France | Tax Year 2012 [Member] |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2012
France | Tax Year 2015 [Member] |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2015
France | Tax Year 2016 [Member] |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2016
Germany | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2007
Germany | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2016
United Kingdom | Earliest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2012
United Kingdom | Latest tax year under exam |
Income Tax Examination [Line Items] |
Tax years currently under audit exam | 2015

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