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Share-based compensation and employee benefit plans - Defined contribution plans narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
SiriusPoint International      
Defined Contribution Plan Disclosure [Line Items]      
Projected benefit obligation $ 20.4    
Funded status (2.3)    
Expenses related to benefit plans $ 3.0    
United Kingdom | SiriusPoint International      
Defined Contribution Plan Disclosure [Line Items]      
Employer contribution, percentage of employee's salary 12.00%    
Belgium | Minimum | SiriusPoint International      
Defined Contribution Plan Disclosure [Line Items]      
Employer contribution, percentage of employee's salary 6.50%    
Belgium | Maximum | SiriusPoint International      
Defined Contribution Plan Disclosure [Line Items]      
Employer contribution, percentage of employee's salary 8.50%    
Switzerland | Minimum | SiriusPoint International      
Defined Contribution Plan Disclosure [Line Items]      
Employer premium, percentage 60.00%    
Employee premium, percentage 30.00%    
Switzerland | Maximum | SiriusPoint International      
Defined Contribution Plan Disclosure [Line Items]      
Employer premium, percentage 70.00%    
Employee premium, percentage 40.00%    
Bermuda | SiriusPoint Bermuda      
Defined Contribution Plan Disclosure [Line Items]      
Expenses related to defined contribution plans $ 1.2 $ 0.7 $ 0.7
U.S.      
Defined Contribution Plan Disclosure [Line Items]      
Expenses related to defined contribution plans $ 2.7 $ 0.2 $ 0.2