Income Taxes - Tax Years Subject to Examination by Significant Jurisdictions (Details)	12 Months Ended
	Dec. 31, 2017
Foreign Tax Authority | Earliest Tax Year | Belgium
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2014
Foreign Tax Authority | Earliest Tax Year | Brazil
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2012
Foreign Tax Authority | Earliest Tax Year | Italy
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2014
Foreign Tax Authority | Earliest Tax Year | Netherlands
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2012
Foreign Tax Authority | Earliest Tax Year | Swedish Tax Agency
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2011
Foreign Tax Authority | Latest Tax Year | Belgium
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2017
Foreign Tax Authority | Latest Tax Year | Brazil
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2017
Foreign Tax Authority | Latest Tax Year | Italy
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2017
Foreign Tax Authority | Latest Tax Year | Netherlands
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2017
Foreign Tax Authority | Latest Tax Year | Swedish Tax Agency
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2017
Domestic Tax Authority | Earliest Tax Year | United States
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2016
Domestic Tax Authority | Latest Tax Year | United States
Income Tax Examination [Line Items]
Tax years which remain subject to examination	2017