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Income Taxes - Summary of Income Tax Examinations (Details) - Earliest period | 12 Months Ended
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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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- 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 + Details
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