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Income Taxes - Summary of Income Tax Examinations (Details) - Earliest period	12 Months Ended
	Dec. 31, 2018
Australia
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2010
Austria
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2012
Belgium
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2016
Canada Revenue Agency
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2014
Netherlands
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2013
Singapore
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2013
Switzerland
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2017
United Kingdom
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2017
Internal Revenue Service (IRS) [Member]
Earliest tax year subject to audit, by jurisdiction
Earliest tax year subject to audit	2015

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No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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