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Goodwill - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Goodwill [Roll Forward]    
Opening goodwill $ 936,257 $ 883,170
Current year acquisitions (note 6) 8,120,006 27,191
Prior period acquisition 0 123
Foreign exchange movement (18,332) 25,773
Closing goodwill $ 9,037,931 $ 936,257