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Business segment information - Distribution of Depreciation and Amortization by Geographical Area (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Depreciation, amortization and reduction in carrying value of right-of-use assets $ 24,198 $ 22,867 $ 48,718 $ 46,517
Ireland        
Segment Reporting Information [Line Items]        
Depreciation, amortization and reduction in carrying value of right-of-use assets 9,385 7,951 18,424 16,192
Rest of Europe        
Segment Reporting Information [Line Items]        
Depreciation, amortization and reduction in carrying value of right-of-use assets 3,681 3,672 7,648 7,487
U.S.        
Segment Reporting Information [Line Items]        
Depreciation, amortization and reduction in carrying value of right-of-use assets 8,168 6,201 16,716 14,840
Rest of World        
Segment Reporting Information [Line Items]        
Depreciation, amortization and reduction in carrying value of right-of-use assets $ 2,964 $ 5,043 $ 5,930 $ 7,998