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Restructuring - Rollforward Activity (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Restructuring Reserve [Roll Forward]          
Opening provision     $ 10,748 $ 1,637 $ 1,637
Additional provisions $ 6,162 $ 0 6,162 $ 18,089 18,089
Utilization     (6,802)   (9,303)
Foreign exchange movement     (93)   325
Ending provision $ 10,015   $ 10,015   $ 10,748