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Retirement Benefit Arrangements - Active Defined Benefit Plan (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 44,442 37,105  
Change in pension obligation:      
Service cost 10,961 8,619  
Interest cost 520 1,584  
Plan participants’ contributions 4,056 3,604  
Actuarial loss 12,023 18,286  
Plan amendments 0 3,551  
Benefits paid (3,910) (2,352)  
Foreign currency adjustments 20,550 2,828  
Change in pension obligation 44,200 36,120  
Change in fair value of plan assets:      
Actual return on plan assets 2,820 18,140  
Employer contributions 7,941 7,193  
Plan participants’ contributions 4,056 3,604  
Benefits paid (3,910) (2,352)  
Foreign currency adjustments 15,685 2,198  
Change in fair value of plan assets 26,592 28,783  
Funded status:      
Unfunded pension obligation at end of year 62,050 44,442 $ 37,105
Additional information:      
Projected benefit obligation at end of year [1] 242,112 197,912  
Accumulated pension obligation at end of year [2] $ 231,419 $ 189,089  
Pension obligation - assumptions used      
Discount rate 0.10% 0.25% 1.00%
Interest crediting rate 1.00% 1.00% 1.00%
Rate of compensation increase 2.00% 2.00% 2.25%
Net periodic benefit cost - assumptions used      
Discount rate 0.25% 1.00% 0.75%
Interest crediting rate 1.00% 1.00% 1.00%
Expected return on plan assets 3.50% 3.50% 0.75%
Rate of compensation increase 2.00% 2.00% 2.25%
Defined Benefit Plan Estimated Future Benefit Payments Abstract      
2021 $ 8,040    
2022 7,478    
2023 8,351    
2024 8,727    
2025 9,289    
2026 to 2029 52,579    
Significant other observable inputs (Level 2) | Insured funds | Zurich Plan      
Additional information:      
Fair value of plan assets at end of year $ 180,062 $ 153,470  
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plans, Accumulated Benefits, Vesting Period 0 years    
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