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Income Taxes - Tax Jurisdictions and Years Currently under Audit Exam (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2018
Income Tax Examination [Line Items] |  |  |
Estimated benefit to tax expense |  | $ 25 |
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 | 2016 |  |
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 | 2015 |  |
SPAIN | Earliest tax year under exam |  |  |
Income Tax Examination [Line Items] |  |  |
Tax years currently under audit exam | 2010 |  |
SPAIN | Latest tax year under exam |  |  |
Income Tax Examination [Line Items] |  |  |
Tax years currently under audit exam | 2012 |  |
SWITZERLAND | Earliest tax year under exam |  |  |
Income Tax Examination [Line Items] |  |  |
Tax years currently under audit exam | 2011 |  |
SWITZERLAND | Latest tax year under exam |  |  |
Income Tax Examination [Line Items] |  |  |
Tax years currently under audit exam | 2014 |  |
United Kingdom | Earliest tax year under exam |  |  |
Income Tax Examination [Line Items] |  |  |
Tax years currently under audit exam | 2011 |  |
United Kingdom | Latest tax year under exam |  |  |
Income Tax Examination [Line Items] |  |  |
Tax years currently under audit exam | 2015 |  |

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