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Loss and Loss Adjustment Expense Reserves - Incurred Loss and Allocated LAE, Net of Reinsurance (Details)
$ in Millions
Dec. 31, 2021
USD ($)
basisPoint
Dec. 31, 2020
USD ($)
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 ($)
Dec. 31, 2012
USD ($)
Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 511.5                  
Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance 259.8                  
Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance 232.5                  
Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance 82.2                  
Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance 263.9                  
2012 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance 60.0 $ 60.2 $ 60.2 $ 60.4 $ 60.0 $ 60.2 $ 65.7 $ 65.1 $ 68.4 $ 84.1
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,710                  
2012 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 32.1 32.0 32.0 32.6 32.8 33.6 42.8 46.0 55.1 64.7
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,428                  
2012 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 26.8 26.8 26.6 26.3 25.8 26.7 30.8 31.8 36.1 43.1
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 887                  
2012 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 11.1 11.3 11.0 11.0 9.9 10.1 16.2 17.7 21.1 22.6
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.8                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,016                  
2012 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 23.1 22.7 22.8 22.3 21.7 22.3 34.4 37.8 44.6 $ 44.3
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.2)                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,430                  
2013 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 61.6 61.6 61.6 61.7 61.6 62.1 66.6 66.9 74.6  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,586                  
2013 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 29.9 29.6 29.7 29.9 31.0 31.6 41.9 50.8 64.9  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.2)                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,641                  
2013 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 17.3 17.3 16.9 17.1 16.9 17.5 25.6 34.9 48.6  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.3                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,122                  
2013 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 8.9 9.0 8.8 8.9 8.1 8.3 15.0 18.8 23.2  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.3                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,134                  
2013 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 49.9 49.8 49.8 49.8 47.0 49.2 70.1 75.8 $ 65.7  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,810                  
2014 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 28.5 28.5 28.5 28.6 28.6 29.4 31.3 34.8    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,963                  
2014 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 14.4 14.4 14.3 14.7 16.2 17.4 27.2 41.3    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.5                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,581                  
2014 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 43.5 43.5 42.9 41.5 41.3 41.9 51.1 51.1    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.3)                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,409                  
2014 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 7.7 7.8 7.8 8.0 7.0 7.5 13.8 17.1    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.2                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,359                  
2014 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 55.0 56.0 55.6 55.9 46.0 46.8 67.5 $ 46.9    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.9                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,932                  
2015 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 15.9 15.9 15.9 16.0 16.2 17.4 19.8      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,884                  
2015 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 12.2 12.0 12.0 12.7 13.6 15.4 25.3      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.2                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 3,390                  
2015 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 10.8 10.7 10.6 10.1 10.4 13.0 21.3      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.7                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,876                  
2015 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 6.2 6.4 6.5 7.0 6.0 7.7 12.3      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.6                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,247                  
2015 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 32.0 33.2 33.0 35.7 26.4 23.9 $ 26.9      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,009                  
2016 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 18.0 17.9 18.0 17.9 16.9 21.7        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.3)                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 3,478                  
2016 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 15.1 14.9 15.1 16.0 18.1 22.3        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.7                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 4,117                  
2016 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 9.3 9.0 9.2 8.7 11.7 15.9        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (1.3)                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,941                  
2016 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 6.9 7.0 6.6 6.3 5.0 5.7        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,483                  
2016 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 34.1 35.3 35.4 38.8 25.3 $ 19.1        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.8                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,141                  
2017 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 36.0 36.7 37.4 29.9 22.6          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.6                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 4,610                  
2017 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 16.5 16.4 16.9 18.6 23.9          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 4,470                  
2017 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 10.6 10.5 10.9 11.9 16.0          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.5                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,179                  
2017 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 5.9 6.2 7.2 7.8 7.4          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.7                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,489                  
2017 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 26.7 28.0 26.7 27.2 $ 17.4          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.5                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,597                  
2018 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 44.5 46.3 44.2 37.5            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.5                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 4,270                  
2018 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 17.0 16.7 18.9 24.5            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.5                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 3,487                  
2018 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 13.7 14.8 13.9 12.1            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,090                  
2018 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 7.1 7.3 9.0 8.7            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.9                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 961                  
2018 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 20.0 20.2 18.2 $ 13.5            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.9                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,265                  
2019 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 23.4 27.8 30.4              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 4,073                  
2019 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 17.2 17.3 19.3              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.6                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,562                  
2019 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 13.5 14.6 16.6              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.8                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,315                  
2019 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 6.3 7.4 8.0              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.7                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 742                  
2019 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 15.4 14.3 $ 10.8              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.7                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 961                  
2020 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 61.5 62.9                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 15.2                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 4,532                  
2020 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 21.7 24.4                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.9                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,668                  
2020 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 19.7 20.7                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 6.2                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,925                  
2020 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 6.2 7.6                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.9                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 420                  
2020 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 6.0 $ 4.2                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.6                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 552                  
2021 | Property and Accident & Health                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 162.1                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 70.8                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 2,860                  
2021 | Marine & Energy                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 83.7                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 69.9                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,091                  
2021 | Specialty                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 67.3                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 57.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 1,341                  
2021 | Casualty - Active                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 15.9                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 14.2                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 452                  
2021 | Casualty - Runoff                    
Claims Development [Line Items]                    
Incurred Loss and LAE, Net of Reinsurance $ 1.7                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims | basisPoint 260