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Restructuring (Tables)
9 Months Ended
Sep. 30, 2021
Restructuring and Related Activities [Abstract]  
Details of movement in restructuring charge
Nine Months EndedYear ended
September 30, 2021December 31, 2020
(in thousands)
Opening provision$10,748 $1,637 
Additional provisions6,162 18,089 
Utilization(6,802)(9,303)
Foreign exchange movement(93)325 
Ending provision$10,015 $10,748