XML 107 R91.htm IDEA: XBRL DOCUMENT v3.22.4
Loss and Loss Adjustment Expense Reserves - Incurred Loss and Allocated LAE, Net of Reinsurance (Details) - Ark
$ in Millions
Dec. 31, 2022
USD ($)
basisPoint
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 667.0                  
Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance 356.4                  
Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance 369.9                  
Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance 109.5                  
Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance 256.2                  
2013 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance 59.3 $ 59.3 $ 59.3 $ 59.4 $ 59.5 $ 59.6 $ 60.1 $ 60.3 $ 60.4 $ 67.8
Total IBNR plus expected development on reported claims $ 0.1                  
Cumulative number of reported claims | basisPoint 2,530                  
2013 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 29.3 29.4 29.3 29.5 29.6 30.8 31.0 32.3 41.7 55.4
Total IBNR plus expected development on reported claims $ (0.2)                  
Cumulative number of reported claims | basisPoint 2,638                  
2013 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 15.8 15.7 15.7 15.5 15.8 15.9 16.2 17.6 28.5 47.0
Total IBNR plus expected development on reported claims $ 0.1                  
Cumulative number of reported claims | basisPoint 1,042                  
2013 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 7.8 7.8 7.8 7.7 8.1 8.0 8.0 8.5 13.0 18.2
Total IBNR plus expected development on reported claims $ 0.1                  
Cumulative number of reported claims | basisPoint 1,144                  
2013 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 47.5 47.5 47.5 47.7 47.3 47.6 49.0 47.7 51.4 $ 47.7
Total IBNR plus expected development on reported claims $ 1.4                  
Cumulative number of reported claims | basisPoint 1,798                  
2014 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 28.2 28.2 28.2 28.2 28.1 28.3 29.0 29.1 32.2  
Total IBNR plus expected development on reported claims $ 0.1                  
Cumulative number of reported claims | basisPoint 2,919                  
2014 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 13.7 13.6 13.9 13.6 14.0 16.1 17.0 19.9 34.1  
Total IBNR plus expected development on reported claims $ (0.2)                  
Cumulative number of reported claims | basisPoint 2,572                  
2014 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 43.1 43.3 43.4 43.3 40.8 40.4 40.8 43.8 45.5  
Total IBNR plus expected development on reported claims $ 0.0                  
Cumulative number of reported claims | basisPoint 1,357                  
2014 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 7.1 6.9 7.1 7.0 7.4 7.5 7.7 8.7 12.6  
Total IBNR plus expected development on reported claims $ 0.2                  
Cumulative number of reported claims | basisPoint 1,385                  
2014 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 55.6 55.8 56.0 56.0 54.5 50.9 47.8 45.3 $ 45.8  
Total IBNR plus expected development on reported claims $ 1.3                  
Cumulative number of reported claims | basisPoint 1,941                  
2015 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 15.4 15.5 15.7 15.7 15.9 16.9 17.9 18.8    
Total IBNR plus expected development on reported claims $ 0.1                  
Cumulative number of reported claims | basisPoint 2,826                  
2015 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 12.2 12.0 12.1 12.0 12.6 15.4 16.7 21.0    
Total IBNR plus expected development on reported claims $ 0.0                  
Cumulative number of reported claims | basisPoint 3,238                  
2015 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 7.8 10.1 10.1 9.9 9.6 11.2 13.6 16.2    
Total IBNR plus expected development on reported claims $ 0.1                  
Cumulative number of reported claims | basisPoint 1,840                  
2015 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 6.5 6.3 6.4 6.6 7.3 7.4 9.0 8.8    
Total IBNR plus expected development on reported claims $ 0.2                  
Cumulative number of reported claims | basisPoint 1,280                  
2015 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 36.6 34.1 34.8 33.8 34.0 30.6 29.4 $ 33.8    
Total IBNR plus expected development on reported claims $ 1.6                  
Cumulative number of reported claims | basisPoint 1,995                  
2016 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 18.2 18.3 18.1 18.1 17.9 17.2 21.9      
Total IBNR plus expected development on reported claims $ 0.1                  
Cumulative number of reported claims | basisPoint 3,419                  
2016 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 13.8 14.5 14.0 14.3 15.4 19.2 23.1      
Total IBNR plus expected development on reported claims $ 0.0                  
Cumulative number of reported claims | basisPoint 3,764                  
2016 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 8.8 11.6 11.7 11.1 10.8 14.1 18.1      
Total IBNR plus expected development on reported claims $ 0.2                  
Cumulative number of reported claims | basisPoint 1,927                  
2016 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 8.1 8.0 7.9 7.8 7.8 7.1 7.6      
Total IBNR plus expected development on reported claims $ 0.3                  
Cumulative number of reported claims | basisPoint 1,528                  
2016 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 33.8 34.6 34.9 34.7 36.5 28.3 $ 28.6      
Total IBNR plus expected development on reported claims $ 1.7                  
Cumulative number of reported claims | basisPoint 2,150                  
2017 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 36.0 36.5 37.9 38.9 31.4 24.6        
Total IBNR plus expected development on reported claims $ 5.7                  
Cumulative number of reported claims | basisPoint 4,599                  
2017 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 15.0 15.9 16.2 16.8 18.6 25.3        
Total IBNR plus expected development on reported claims $ 0.2                  
Cumulative number of reported claims | basisPoint 4,117                  
2017 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 10.0 11.0 10.8 11.3 12.2 17.3        
Total IBNR plus expected development on reported claims $ 0.0                  
Cumulative number of reported claims | basisPoint 2,187                  
2017 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 8.4 7.0 7.3 8.7 9.6 9.5        
Total IBNR plus expected development on reported claims $ 0.9                  
Cumulative number of reported claims | basisPoint 1,580                  
2017 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 26.7 28.4 28.9 28.2 30.8 $ 27.4        
Total IBNR plus expected development on reported claims $ 2.2                  
Cumulative number of reported claims | basisPoint 1,599                  
2018 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 44.2 44.1 46.4 44.5 38.1          
Total IBNR plus expected development on reported claims $ 1.3                  
Cumulative number of reported claims | basisPoint 4,254                  
2018 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 16.6 17.0 16.6 19.1 24.6          
Total IBNR plus expected development on reported claims $ 0.2                  
Cumulative number of reported claims | basisPoint 3,205                  
2018 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 13.5 14.7 15.4 14.9 13.2          
Total IBNR plus expected development on reported claims $ 0.7                  
Cumulative number of reported claims | basisPoint 2,110                  
2018 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 6.8 9.0 9.2 11.5 11.0          
Total IBNR plus expected development on reported claims $ 1.1                  
Cumulative number of reported claims | basisPoint 1,036                  
2018 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 21.9 22.3 23.0 23.9 $ 29.4          
Total IBNR plus expected development on reported claims $ 3.3                  
Cumulative number of reported claims | basisPoint 1,267                  
2019 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 21.5 24.7 28.9 31.6            
Total IBNR plus expected development on reported claims $ 0.7                  
Cumulative number of reported claims | basisPoint 3,999                  
2019 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 18.3 18.6 18.6 20.7            
Total IBNR plus expected development on reported claims $ 0.6                  
Cumulative number of reported claims | basisPoint 2,331                  
2019 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 22.4 15.4 16.3 18.5            
Total IBNR plus expected development on reported claims $ 1.1                  
Cumulative number of reported claims | basisPoint 2,347                  
2019 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 7.3 9.1 10.4 11.6            
Total IBNR plus expected development on reported claims $ 2.4                  
Cumulative number of reported claims | basisPoint 834                  
2019 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 19.4 18.0 17.8 $ 21.1            
Total IBNR plus expected development on reported claims $ 5.0                  
Cumulative number of reported claims | basisPoint 961                  
2020 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 62.9 63.3 65.2              
Total IBNR plus expected development on reported claims $ 7.3                  
Cumulative number of reported claims | basisPoint 4,551                  
2020 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 23.2 21.7 24.4              
Total IBNR plus expected development on reported claims $ 1.8                  
Cumulative number of reported claims | basisPoint 1,529                  
2020 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 16.3 20.5 21.4              
Total IBNR plus expected development on reported claims $ 2.5                  
Cumulative number of reported claims | basisPoint 1,985                  
2020 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 7.1 8.3 9.7              
Total IBNR plus expected development on reported claims $ 4.2                  
Cumulative number of reported claims | basisPoint 524                  
2020 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 9.3 7.6 $ 11.3              
Total IBNR plus expected development on reported claims $ 3.9                  
Cumulative number of reported claims | basisPoint 558                  
2021 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 146.8 163.0                
Total IBNR plus expected development on reported claims $ 10.6                  
Cumulative number of reported claims | basisPoint 3,318                  
2021 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 66.1 83.0                
Total IBNR plus expected development on reported claims $ 24.8                  
Cumulative number of reported claims | basisPoint 1,356                  
2021 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 59.4 67.6                
Total IBNR plus expected development on reported claims $ 33.9                  
Cumulative number of reported claims | basisPoint 1,644                  
2021 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 18.4 17.4                
Total IBNR plus expected development on reported claims $ 16.3                  
Cumulative number of reported claims | basisPoint 674                  
2021 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 4.8 $ 8.2                
Total IBNR plus expected development on reported claims $ 2.7                  
Cumulative number of reported claims | basisPoint 277                  
2022 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 234.5                  
Total IBNR plus expected development on reported claims $ 90.1                  
Cumulative number of reported claims | basisPoint 2,899                  
2022 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 148.2                  
Total IBNR plus expected development on reported claims $ 99.5                  
Cumulative number of reported claims | basisPoint 1,188                  
2022 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 172.8                  
Total IBNR plus expected development on reported claims $ 125.3                  
Cumulative number of reported claims | basisPoint 985                  
2022 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 32.0                  
Total IBNR plus expected development on reported claims $ 28.8                  
Cumulative number of reported claims | basisPoint 832                  
2022 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 0.6                  
Total IBNR plus expected development on reported claims $ 0.1                  
Cumulative number of reported claims | basisPoint 76