Income Taxes Income Tax Examination by Jurisdiction (Details)	12 Months Ended
	Dec. 31, 2017
U.S. federal
Income Tax Examination [Line Items]
Earliest year subject to examination by major tax jurisdiction	2013
FRANCE
Income Tax Examination [Line Items]
Earliest year subject to examination by major tax jurisdiction	2012
GERMANY
Income Tax Examination [Line Items]
Earliest year subject to examination by major tax jurisdiction	2010
BRAZIL
Income Tax Examination [Line Items]
Earliest year subject to examination by major tax jurisdiction	2011
UNITED KINGDOM
Income Tax Examination [Line Items]
Earliest year subject to examination by major tax jurisdiction	2012
ITALY
Income Tax Examination [Line Items]
Earliest year subject to examination by major tax jurisdiction	2011