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Income Taxes - Summary of open tax years by major jurisdiction (Details)
12 Months Ended
Dec. 31, 2019
United States | Minimum  
Income Tax Contingency [Line Items]  
Open tax year 2016
United States | Maximum  
Income Tax Contingency [Line Items]  
Open tax year 2019
United Kingdom | Minimum  
Income Tax Contingency [Line Items]  
Open tax year 2018
United Kingdom | Maximum  
Income Tax Contingency [Line Items]  
Open tax year 2019
Ireland | Minimum  
Income Tax Contingency [Line Items]  
Open tax year 2015
Ireland | Maximum  
Income Tax Contingency [Line Items]  
Open tax year 2019
Canada | Minimum  
Income Tax Contingency [Line Items]  
Open tax year 2016
Canada | Maximum  
Income Tax Contingency [Line Items]  
Open tax year 2019
Switzerland | Minimum  
Income Tax Contingency [Line Items]  
Open tax year 2017
Switzerland | Maximum  
Income Tax Contingency [Line Items]  
Open tax year 2019
Denmark | Minimum  
Income Tax Contingency [Line Items]  
Open tax year 2015
Denmark | Maximum  
Income Tax Contingency [Line Items]  
Open tax year 2019