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Employee Benefits - Change in Benefit Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
United Kingdom | ICON Development Solutions Limited pension plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 41,813 $ 43,988  
Service cost 117 134 $ 100
Interest cost 672 665 746
Plan participants' contributions 19 23  
Benefits paid 514 489  
Actuarial gain (18,636) (2,097)  
Foreign currency exchange rate changes (3,913) (411)  
  Benefit obligation at end of year 19,558 41,813 43,988
Switzerland | Aptiv Solutions pension plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 7,643 8,620  
Service cost 146 150  
Interest cost 30 12  
Plan participants' contributions 82 95  
Settlement (218) (483)  
Prior service cost (23) (82)  
Benefits paid and transferred balances (182) 76  
Actuarial gain (1,527) (484)  
Foreign currency exchange rate changes (145) (261)  
  Benefit obligation at end of year 5,806 7,643 8,620
Switzerland | PRA Switzerland AG pension plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 4,990 4,890  
Service cost 404 207  
Interest cost 20 19  
Plan participants' contributions 2,396 135  
Settlement (844) 0  
Benefits paid 946 113  
Actuarial gain (627) 1  
Foreign currency exchange rate changes (48) (149)  
  Benefit obligation at end of year $ 5,345 $ 4,990 $ 4,890