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Commitments and contingencies - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 26, 2023
Mar. 07, 2022
Feb. 26, 2021
Sep. 16, 2020
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Other Commitments [Line Items]              
Dividends paid to preference shareholders         $ 4.0 $ 4.0  
Liability-classified capital instruments         47.0   $ 60.4
Settlement of contingent value rights         38.5 0.0  
Operating lease expense         2.5 $ 2.9  
Series A preference shares              
Other Commitments [Line Items]              
Liability-classified capital instruments         7.1    
Merger warrants              
Other Commitments [Line Items]              
Liability-classified capital instruments         30.7    
Private warrants              
Other Commitments [Line Items]              
Liability-classified capital instruments         9.2    
Public warrants              
Other Commitments [Line Items]              
Liability-classified capital instruments         0.0    
CVRs              
Other Commitments [Line Items]              
Settlement of contingent value rights $ 38.5            
Liability-classified capital instruments | Series A preference shares              
Other Commitments [Line Items]              
Change in carrying value of Series A preference shares         5.3    
Liability-classified capital instruments | Merger warrants              
Other Commitments [Line Items]              
Change in carrying value of Series A preference shares         16.0    
Liability-classified capital instruments | Private warrants              
Other Commitments [Line Items]              
Change in carrying value of Series A preference shares         4.3    
Liability-classified capital instruments | Public warrants              
Other Commitments [Line Items]              
Change in carrying value of Series A preference shares         $ 0.0    
Sirius Group | Series A preference shares              
Other Commitments [Line Items]              
Par value (in dollars per share)     $ 0.10        
Issuance of SiriusPoint common shares (in shares)     11,720,987        
Sirius Group | Merger warrants              
Other Commitments [Line Items]              
Number of shares in which the warrants can be converted (in shares)         21,009,324    
Sirius Group | Series A preference shares              
Other Commitments [Line Items]              
Dividends paid to preference shareholders         $ 0.0    
Player's Health              
Other Commitments [Line Items]              
Amount lent under note agreement   $ 8.0          
Notes receivable, interest rate   6.00%          
Affiliated entity              
Other Commitments [Line Items]              
Related party interest rate       8.00%      
Amount drawn         $ 0.0    
Affiliated entity | Loan commitment              
Other Commitments [Line Items]              
Maximum commitment       $ 18.0