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Retirement Benefit Arrangements - Active Defined Benefit Plan (Details) - Zurich Plan - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Funded status:      
Unfunded pension obligation at beginning of year $ 32,636 $ 62,050  
Change in pension obligation:      
Service cost 8,746 11,811  
Interest cost 373 228  
Plan participants’ contributions 3,792 4,048  
Actuarial gain (37,992) (24,211)  
Benefits paid (4,576) (1,651)  
Foreign currency adjustments (3,736) (8,735)  
Settlements 0 (20,682)  
Change in pension obligation (33,393) (39,192)  
Change in fair value of plan assets:      
Actual return on plan assets (14,936) 6,847 $ 3,000
Employer contributions 7,658 8,035  
Plan participants’ contributions 3,792 4,048  
Benefits paid (4,576) (1,651)  
Foreign currency adjustments (2,233) (6,375)  
Settlements 0 (20,682)  
Change in fair value of plan assets (10,295) (9,778)  
Funded status:      
Unfunded pension obligation at end of year 9,538 32,636 $ 62,050
Additional information:      
Projected benefit obligation at end of year [1] 169,527 202,920  
Accumulated pension obligation at end of year [2] $ 167,560 $ 194,730  
Pension obligation - assumptions used      
Discount rate 2.20% 0.20% 0.10%
Interest crediting rate 2.20% 1.00% 1.00%
Rate of compensation increase 2.25% 2.00% 2.00%
Net periodic benefit cost - assumptions used      
Discount rate 0.20% 0.10% 0.25%
Interest crediting rate 1.00% 1.00% 1.00%
Expected return on plan assets 4.25% 3.50% 3.50%
Rate of compensation increase 2.00% 2.00% 2.00%
Defined Benefit Plan Estimated Future Benefit Payments Abstract      
2023 $ 11,377    
2024 9,696    
2025 10,739    
2026 12,454    
2027 11,111    
2028 to 2032 52,119    
Significant other observable inputs (Level 2) | Insured funds      
Additional information:      
Fair value of plan assets at end of year $ 159,989 $ 170,284  
[1] Represents the actuarial present value of all benefits attributed to employee service rendered to December 31, measured using assumptions as to future compensation levels
[2] Represents the actuarial present value of benefits (whether vested or non-vested) attributed to employee service rendered and compensation to December 31, with no assumption about future compensation levels