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Debt and standby letters of credit facilities - 2017 SEK Subordinated Notes and 2016 SIG Senior Notes (Details)
kr in Millions, $ in Millions
12 Months Ended
Nov. 05, 2018
USD ($)
Sep. 22, 2017
USD ($)
Sep. 22, 2017
SEK (kr)
Nov. 01, 2016
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 22, 2017
SEK (kr)
Debt and standby letters of credit facilities                
Outstanding preference shares redeemed $ 164.0              
Interest expense on debt         $ 31.0 $ 30.8 $ 22.4  
2017 SEK Subordinated Notes                
Debt and standby letters of credit facilities                
Debt notes issued   $ 346.1     $ 295.0 $ 307.6   kr 2,750.0
Issue price (as a percent)   100.00% 100.00%          
Term of redemption following occurrence of Specified Event   90 days 90 days          
Debt issuance costs   $ 4.6            
Underwriting fees   $ 3.5 kr 27.5          
Annual interest rate (as a percent)         4.00% 3.80%    
Interest expense on debt         $ 11.9 $ 11.7 3.3  
Effective rate         4.00% 3.80%    
2016 SIG Senior Notes                
Debt and standby letters of credit facilities                
Debt notes issued       $ 400.0 $ 400.0 $ 400.0    
Issue price (as a percent)       99.209%        
Debt issuance costs       $ 5.1        
Underwriting fees       $ 3.4        
Annual interest rate (as a percent)       4.60%        
Interest expense on debt         $ 19.1 $ 19.1 $ 19.1  
Net proceeds       $ 392.4        
Effective rate         4.70% 4.70%    
Preferred stocks | Sirius International Group, Ltd | 2017 SEK Subordinated Notes                
Debt and standby letters of credit facilities                
Outstanding preference shares redeemed         $ 250.0