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Income Taxes - Tax Jurisdictions and Years Currently under Audit Exam (Details)
3 Months Ended
Dec. 31, 2019
BELGIUM  
Income Tax Examination [Line Items]  
Tax years currently under audit exam 2015 2016 2017 2018
CHINA  
Income Tax Examination [Line Items]  
Tax years currently under audit exam 2008 2009 2010 2011 2012 2013 2014 2015 2016
Germany  
Income Tax Examination [Line Items]  
Tax years currently under audit exam 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016
JAPAN  
Income Tax Examination [Line Items]  
Tax years currently under audit exam 2015 2016 2017 2018
LUXEMBOURG  
Income Tax Examination [Line Items]  
Tax years currently under audit exam 2016
United Kingdom  
Income Tax Examination [Line Items]  
Tax years currently under audit exam 2012 2013 2014 2015