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Employee Benefits - Change in Benefit Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
United Kingdom | ICON Development Solutions Limited pension plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year $ 19,558 $ 41,813  
Service cost 42 117 $ 134
Interest cost 975 672 665
Plan participants' contributions 19 19  
Benefits paid (318) (514)  
Actuarial gain (335) (18,636)  
Foreign currency exchange rate changes 1,058 (3,913)  
Benefit obligation at end of year 20,999 19,558 41,813
Switzerland | Aptiv Solutions pension plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 5,806 7,643  
Service cost 109 146  
Interest cost 136 30  
Plan participants' contributions 93 82  
Settlement (645) (218)  
Prior service cost (13) (23)  
Benefits paid and transferred balances (134) (182)  
Actuarial gain 511 (1,527)  
Foreign currency exchange rate changes 578 (145)  
Benefit obligation at end of year 6,441 5,806 7,643
Switzerland | PRA Switzerland AG pension plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at beginning of year 5,345 4,990  
Service cost 417 404  
Interest cost 132 20  
Plan participants' contributions 456 325  
Settlement (753) (844)  
Benefits paid and transferred balances 795 1,125  
Actuarial gain 711 (627)  
Foreign currency exchange rate changes 644 (48)  
Benefit obligation at end of year $ 7,747 $ 5,345 $ 4,990