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Goodwill - Schedule of Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Goodwill [Roll Forward]    
Opening balance $ 9,037,931 $ 936,257
Current period acquisitions (Note 7) 0 8,120,006
Prior period acquisitions 1,462 0
Foreign exchange movement (11,410) (18,332)
Closing balance $ 9,027,983 $ 9,037,931