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Retirement Benefit Arrangements - Active Defined Benefit Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure - Defined contribution plan      
Incurred expense for defined contribution arrangements $ 13,000 $ 13,000 $ 13,000
Zurich Plan      
Funded status:      
Unfunded pension obligation at beginning of year 62,050 44,442  
Change in pension obligation:      
Service cost 11,811 10,961  
Interest cost 228 520  
Plan participants’ contributions 4,048 4,056  
Actuarial (gain) loss (24,211) 12,023  
Benefits paid (1,651) (3,910)  
Foreign currency adjustments (8,735) 20,550  
Settlements (20,682) 0  
Change in pension obligation (39,192) 44,200  
Change in fair value of plan assets:      
Actual return on plan assets 6,847 2,820  
Employer contributions 8,035 7,941  
Plan participants’ contributions 4,048 4,056  
Benefits paid (1,651) (3,910)  
Foreign currency adjustments (6,375) 15,685  
Settlements (20,682) 0  
Change in fair value of plan assets (9,778) 26,592  
Funded status:      
Unfunded pension obligation at end of year 32,636 62,050 $ 44,442
Additional information:      
Projected benefit obligation at end of year [1] 202,920 242,112  
Accumulated pension obligation at end of year [2] $ 194,730 $ 231,419  
Pension obligation - assumptions used      
Discount rate 0.20% 0.10% 0.25%
Interest crediting rate 1.00% 1.00% 1.00%
Rate of compensation increase 2.00% 2.00% 2.00%
Net periodic benefit cost - assumptions used      
Discount rate 0.10% 0.25% 1.00%
Interest crediting rate 1.00% 1.00% 1.00%
Expected return on plan assets 3.50% 3.50% 3.50%
Rate of compensation increase 2.00% 2.00% 2.00%
Defined Benefit Plan Estimated Future Benefit Payments Abstract      
2022 $ 8,578    
2023 9,219    
2024 8,838    
2025 9,824    
2026 11,457    
2027 to 2031 49,075    
Significant other observable inputs (Level 2) | Insured funds | Zurich Plan      
Additional information:      
Fair value of plan assets at end of year $ 170,284 $ 180,062  
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plans, Accumulated Benefits, Vesting Period 4 years    
[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