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Income Taxes - Summary of Income Tax Examinations (Details) - Earliest period	12 Months Ended
	Dec. 31, 2017
Australia
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2009
Austria
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2011
Belgium
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2015
Canada
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2013
Netherlands
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2012
Singapore
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2012
Switzerland
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2016
United States
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2014

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- Definition

Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

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