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Goodwill
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Goodwill
The change in the carrying amount of goodwill for the years ended December 31, 2023 and 2022 is as follows:
December 31, 2023December 31, 2022
 (in thousands)
Opening goodwill$8,971,670 $9,037,931 
Current year acquisitions (note 6)36,750 — 
Prior period acquisition (note 6)— (35,692)
Foreign exchange movement13,655 (30,569)
Closing goodwill$9,022,075 $8,971,670 

There were no goodwill impairment losses for the years ended December 31, 2023 and 2022.