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Reserves for unpaid losses and loss adjustment expenses - Claim Development (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other property                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 1,934.5                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,447.8                  
All outstanding liabilities before 2010, net of reinsurance 4.0                  
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 490.7                  
Other property | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 136.3 $ 136.7 $ 137.0 $ 138.6 $ 139.3 $ 140.2 $ 145.2 $ 144.5 $ 153.2 $ 156.1
Total IBNR liabilities plus expected development on reported claims 1.5                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 131.4 130.5 130.6 130.6 130.1 128.0 123.2 115.5 88.7 31.4
Other property | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 131.1 131.0 132.2 132.0 131.3 133.2 141.2 150.3 162.9  
Total IBNR liabilities plus expected development on reported claims 0.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 127.1 126.5 126.8 124.2 121.7 115.7 102.8 79.1 26.6  
Other property | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 132.0 132.6 132.7 134.7 139.4 143.8 148.9 162.1    
Total IBNR liabilities plus expected development on reported claims 1.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 126.2 125.0 124.2 118.9 115.5 107.4 84.7 20.0    
Other property | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 111.4 111.7 112.2 112.5 116.0 126.8 130.0      
Total IBNR liabilities plus expected development on reported claims 0.7                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 106.3 105.8 105.2 101.9 95.4 71.4 27.2      
Other property | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 111.3 112.0 114.4 114.1 116.6 113.8        
Total IBNR liabilities plus expected development on reported claims 0.7                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 106.7 105.9 103.7 95.5 68.9 18.8        
Other property | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 134.1 134.4 134.4 132.2 139.7          
Total IBNR liabilities plus expected development on reported claims 1.6                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 127.7 123.9 114.3 93.0 30.8          
Other property | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 219.1 218.3 213.7 194.9            
Total IBNR liabilities plus expected development on reported claims 1.7                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 197.5 180.6 128.0 31.2            
Other property | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 387.9 369.3 332.7              
Total IBNR liabilities plus expected development on reported claims 19.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 298.6 222.4 58.2              
Other property | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 326.3 270.8                
Total IBNR liabilities plus expected development on reported claims 34.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 180.1 54.8                
Other property | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 245.0                  
Total IBNR liabilities plus expected development on reported claims 101.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 46.2                  
Property Catastrophe Excess                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 948.7                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 667.2                  
All outstanding liabilities before 2010, net of reinsurance 4.5                  
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 286.0                  
Property Catastrophe Excess | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 127.3 121.3 120.7 121.4 121.9 122.8 130.2 131.0 131.0 136.1
Total IBNR liabilities plus expected development on reported claims 0.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 119.1 118.0 117.5 117.5 113.6 111.1 107.6 102.5 90.0 49.8
Property Catastrophe Excess | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 117.2 117.2 117.1 117.2 118.0 121.4 142.7 89.7 152.6  
Total IBNR liabilities plus expected development on reported claims 0.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 116.7 116.2 116.1 115.2 114.7 114.4 96.0 54.7 15.9  
Property Catastrophe Excess | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 46.5 45.0 44.8 49.7 49.2 51.1 57.8 145.0    
Total IBNR liabilities plus expected development on reported claims 0.5                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 46.1 44.0 42.7 40.9 40.0 35.4 25.8 2.8    
Property Catastrophe Excess | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 71.4 71.8 72.1 72.9 73.5 76.5 70.3      
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 68.9 68.0 66.8 65.5 60.7 48.3 10.9      
Property Catastrophe Excess | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 54.8 54.3 54.4 54.3 57.0 55.4        
Total IBNR liabilities plus expected development on reported claims 0.5                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 51.5 49.1 47.4 41.9 35.8 9.2        
Property Catastrophe Excess | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 25.0 25.9 26.9 29.3 27.4          
Total IBNR liabilities plus expected development on reported claims 0.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 22.4 19.9 16.6 9.3 1.8          
Property Catastrophe Excess | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 41.2 42.4 47.7 50.4            
Total IBNR liabilities plus expected development on reported claims 2.3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 37.0 31.7 25.7 10.4            
Property Catastrophe Excess | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 117.4 123.4 105.4              
Total IBNR liabilities plus expected development on reported claims 8.3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 86.4 67.4 13.2              
Property Catastrophe Excess | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 178.0 160.4                
Total IBNR liabilities plus expected development on reported claims 9.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 115.8 2.7                
Property Catastrophe Excess | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 169.9                  
Total IBNR liabilities plus expected development on reported claims 35.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3.3                  
Agriculture                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 299.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 231.1                  
All outstanding liabilities before 2010, net of reinsurance 0.0                  
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 68.1                  
Agriculture | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 10.7 10.7 10.7 10.7 10.7 10.6 10.7 10.9 10.8 12.8
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 10.7 10.6 10.6 10.6 10.6 10.6 10.6 10.8 10.6 0.5
Agriculture | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 21.6 21.6 21.6 21.6 21.7 21.7 21.7 21.5 21.5  
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 21.6 21.6 21.6 21.6 21.6 21.6 21.6 21.3 1.0  
Agriculture | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 46.9 47.0 47.0 47.0 45.8 45.9 45.9 41.1    
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 46.9 46.9 46.9 46.9 45.6 45.7 45.4 19.0    
Agriculture | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 12.8 12.8 12.8 13.0 12.9 10.8 9.1      
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 12.8 12.8 12.8 13.0 12.8 10.6 7.1      
Agriculture | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 9.0 8.9 8.9 8.5 8.2 9.7        
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 9.0 8.9 8.8 8.8 8.1 6.5        
Agriculture | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 9.4 9.4 9.4 9.1 7.0          
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 9.2 9.2 8.9 7.7 1.5          
Agriculture | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 29.6 29.5 30.5 33.1            
Total IBNR liabilities plus expected development on reported claims 0.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 29.5 29.2 27.8 10.0            
Agriculture | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 46.1 46.8 50.2              
Total IBNR liabilities plus expected development on reported claims (0.4)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 46.1 43.3 9.0              
Agriculture | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 41.3 39.1                
Total IBNR liabilities plus expected development on reported claims 3.3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 35.8 2.6                
Agriculture | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 71.8                  
Total IBNR liabilities plus expected development on reported claims 46.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 9.5                  
Global Accident & Health                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1,654.5                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,482.4                  
All outstanding liabilities before 2010, net of reinsurance 4.8                  
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 176.9                  
Global Accident & Health | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 121.7 121.7 121.8 121.9 121.8 121.8 122.1 123.0 125.4 118.4
Total IBNR liabilities plus expected development on reported claims (0.1)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 122.0 121.9 121.9 121.9 121.8 121.7 121.4 119.2 102.2 53.1
Global Accident & Health | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 171.5 171.4 171.4 171.6 171.6 171.6 172.3 176.7 161.3  
Total IBNR liabilities plus expected development on reported claims 0.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 171.7 171.6 171.6 171.6 171.5 171.1 166.1 139.2 71.2  
Global Accident & Health | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 146.5 146.6 146.7 146.9 147.1 147.8 160.1 163.4    
Total IBNR liabilities plus expected development on reported claims (0.1)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 146.6 146.6 146.6 146.6 146.5 146.1 136.1 72.2    
Global Accident & Health | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 116.8 116.9 117.7 118.3 118.8 123.3 125.5      
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 116.3 116.3 116.8 115.6 114.2 103.7 54.4      
Global Accident & Health | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 129.4 129.4 130.3 130.3 131.9 130.8        
Total IBNR liabilities plus expected development on reported claims 0.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 127.0 126.3 126.3 124.6 111.1 59.2        
Global Accident & Health | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 143.8 144.2 145.5 148.8 152.7          
Total IBNR liabilities plus expected development on reported claims 0.3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 143.1 142.8 141.2 129.8 75.4          
Global Accident & Health | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 181.5 183.0 187.1 173.3            
Total IBNR liabilities plus expected development on reported claims 2.5                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 177.9 176.0 164.4 98.2            
Global Accident & Health | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 165.9 172.6 176.4              
Total IBNR liabilities plus expected development on reported claims 1.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 163.0 150.7 61.5              
Global Accident & Health | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 205.5 198.3                
Total IBNR liabilities plus expected development on reported claims 13.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 186.1 89.0                
Global Accident & Health | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 271.9                  
Total IBNR liabilities plus expected development on reported claims 89.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 128.7                  
Aviation & Space                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 399.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 296.4                  
All outstanding liabilities before 2010, net of reinsurance 6.2                  
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 109.2                  
Aviation & Space | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 41.4 41.6 41.3 41.8 42.0 42.9 44.4 46.9 47.2 42.4
Total IBNR liabilities plus expected development on reported claims (0.4)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 41.0 40.7 39.6 39.4 38.5 37.5 36.0 31.3 22.0 12.0
Aviation & Space | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 35.2 35.0 35.7 34.4 34.6 35.8 37.8 42.2 46.8  
Total IBNR liabilities plus expected development on reported claims (0.2)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 35.5 34.6 34.7 34.0 32.6 31.4 28.5 22.6 10.1  
Aviation & Space | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 28.5 29.5 29.5 28.4 28.2 30.2 34.3 35.6    
Total IBNR liabilities plus expected development on reported claims (0.3)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 28.4 28.7 28.2 27.3 24.6 22.6 18.4 7.6    
Aviation & Space | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 33.0 32.9 32.9 31.9 33.3 36.4 40.5      
Total IBNR liabilities plus expected development on reported claims (0.5)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 30.5 29.1 28.4 26.6 24.0 19.8 13.5      
Aviation & Space | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 33.9 35.9 35.8 36.6 39.9 37.3        
Total IBNR liabilities plus expected development on reported claims (3.0)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 28.8 28.1 26.1 23.5 17.8 8.0        
Aviation & Space | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 36.5 37.1 38.1 34.0 37.6          
Total IBNR liabilities plus expected development on reported claims (0.9)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 34.9 33.4 27.0 21.0 10.5          
Aviation & Space | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 35.8 33.5 32.5 32.0            
Total IBNR liabilities plus expected development on reported claims 2.9                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 29.1 26.7 19.6 7.8            
Aviation & Space | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 44.1 42.8 33.8              
Total IBNR liabilities plus expected development on reported claims 1.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 32.5 23.6 9.0              
Aviation & Space | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 50.5 47.9                
Total IBNR liabilities plus expected development on reported claims 6.7                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 27.4 14.3                
Aviation & Space | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 60.5                  
Total IBNR liabilities plus expected development on reported claims 39.9                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 8.3                  
Trade credit                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 216.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 174.1                  
All outstanding liabilities before 2010, net of reinsurance       4.2            
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 46.5                  
Trade credit | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 9.4 9.6 9.5 9.4 9.4 9.6 9.5 9.3 12.0 13.7
Total IBNR liabilities plus expected development on reported claims (0.3)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 9.3 9.3 9.2 9.1 8.9 8.8 8.4 7.6 5.1 1.7
Trade credit | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 25.4 25.6 25.8 25.8 26.5 26.5 26.7 28.2 28.4  
Total IBNR liabilities plus expected development on reported claims (0.3)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 25.3 25.3 25.2 25.5 25.2 24.3 23.1 17.1 6.4  
Trade credit | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 31.3 31.7 32.0 32.0 32.4 32.2 33.9 33.6    
Total IBNR liabilities plus expected development on reported claims (0.2)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 31.2 31.3 31.3 31.5 31.1 30.4 26.2 14.4    
Trade credit | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 27.3 27.0 27.5 26.9 27.1 27.9 28.8      
Total IBNR liabilities plus expected development on reported claims 0.6                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 24.1 24.0 23.9 23.5 22.3 19.4 11.3      
Trade credit | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 20.5 20.6 20.9 23.0 22.2 22.2        
Total IBNR liabilities plus expected development on reported claims 0.5                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 19.3 19.3 18.8 17.4 13.4 7.7        
Trade credit | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 17.3 18.1 18.8 19.3 19.7          
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16.3 16.4 15.4 12.0 4.5          
Trade credit | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 11.4 12.3 12.9 14.9            
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 11.0 10.4 8.8 4.5            
Trade credit | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 18.9 19.8 18.8              
Total IBNR liabilities plus expected development on reported claims 2.5                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 12.6 8.8 3.0              
Trade credit | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 24.8 24.6                
Total IBNR liabilities plus expected development on reported claims 4.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16.2 7.6                
Trade credit | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 30.1                  
Total IBNR liabilities plus expected development on reported claims 13.8                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 8.8                  
Environmental                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 4.7                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.1                  
All outstanding liabilities before 2010, net of reinsurance       0.0            
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 4.6                  
Environmental | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
Environmental | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0  
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0  
Environmental | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0    
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0    
Environmental | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0 0.0 0.0      
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0 0.0 0.0      
Environmental | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0 0.0        
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0 0.0        
Environmental | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0          
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0 0.0          
Environmental | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0            
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0 0.0            
Environmental | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0              
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0              
Environmental | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.1 0.4                
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0                
Environmental | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 4.6                  
Total IBNR liabilities plus expected development on reported claims 0.8                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.1                  
Marine                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 270.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 218.8                  
All outstanding liabilities before 2010, net of reinsurance       0.8            
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 52.4                  
Marine | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 30.0 30.0 30.2 30.4 31.7 32.1 30.7 31.0 33.3 30.5
Total IBNR liabilities plus expected development on reported claims 0.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 28.8 28.7 28.5 27.5 26.7 21.3 19.5 17.1 12.2 5.0
Marine | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 32.3 31.6 31.7 31.6 32.2 31.2 30.7 33.0 36.7  
Total IBNR liabilities plus expected development on reported claims (0.3)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 30.4 29.7 29.3 28.8 28.0 25.2 21.8 14.4 4.4  
Marine | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 36.2 36.3 36.8 37.9 37.5 36.0 33.4 27.2    
Total IBNR liabilities plus expected development on reported claims 1.7                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 33.8 32.6 31.0 29.1 27.1 24.2 14.8 5.2    
Marine | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 18.1 18.0 18.0 18.2 19.2 20.5 23.2      
Total IBNR liabilities plus expected development on reported claims 0.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 15.1 14.9 14.4 14.0 12.6 9.3 2.9      
Marine | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 18.4 17.8 18.2 19.4 21.4 23.2        
Total IBNR liabilities plus expected development on reported claims (0.3)                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 15.8 15.7 15.0 13.6 10.2 4.1        
Marine | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 28.3 28.4 28.9 31.0 29.3          
Total IBNR liabilities plus expected development on reported claims 0.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 26.9 25.9 21.5 11.6 4.3          
Marine | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 28.3 28.3 29.1 28.2            
Total IBNR liabilities plus expected development on reported claims 0.8                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 24.2 21.3 17.4 6.8            
Marine | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 34.6 34.8 37.2              
Total IBNR liabilities plus expected development on reported claims 2.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 26.1 18.1 7.2              
Marine | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 25.4 23.1                
Total IBNR liabilities plus expected development on reported claims 3.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 13.9 5.2                
Marine | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 18.8                  
Total IBNR liabilities plus expected development on reported claims 6.7                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3.8                  
Surety                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 6.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3.1                  
All outstanding liabilities before 2010, net of reinsurance       1.9            
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 4.9                  
Surety | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.1 0.1 0.1 0.3 0.3 0.4 0.4 0.2 0.1 0.1
Total IBNR liabilities plus expected development on reported claims 0.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.0
Surety | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.2 0.2 0.2 0.4 0.4 0.6 0.6 0.5 0.3  
Total IBNR liabilities plus expected development on reported claims 0.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.1  
Surety | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.3 0.3 0.3 0.4 0.4 0.6 0.6 0.5    
Total IBNR liabilities plus expected development on reported claims 0.3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.2 0.2 0.2 0.2 0.2 0.1 0.1 0.1    
Surety | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.8 0.9 0.7 0.5 0.7 0.9 1.0      
Total IBNR liabilities plus expected development on reported claims 0.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.6 0.6 0.5 0.3 0.2 0.1 0.1      
Surety | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1.1 1.3 1.1 1.0 1.1 1.2        
Total IBNR liabilities plus expected development on reported claims 0.3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1.2 0.9 0.7 0.4 0.2 0.0        
Surety | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.7 0.8 1.0 1.2 1.0          
Total IBNR liabilities plus expected development on reported claims 0.3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.5 0.4 0.3 0.2 0.0          
Surety | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.3 0.5 0.0 0.0            
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.3 0.3 0.0 0.0            
Surety | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.4 0.4 0.6              
Total IBNR liabilities plus expected development on reported claims 0.3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0 0.0              
Surety | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1.0 0.9                
Total IBNR liabilities plus expected development on reported claims 0.9                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0 0.0                
Surety | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 1.2                  
Total IBNR liabilities plus expected development on reported claims 1.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.0                  
Contingency                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 76.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 67.9                  
All outstanding liabilities before 2010, net of reinsurance       (0.1)            
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 8.3                  
Contingency | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 4.1 4.1 4.1 4.1 4.1 4.2 4.4 4.5 5.9 5.5
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 4.1 4.1 4.1 4.1 4.0 3.9 3.5 3.5 3.4 1.9
Contingency | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 6.6 6.6 6.6 6.6 6.5 6.5 6.6 7.1 7.7  
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 6.5 6.5 6.5 6.5 6.5 6.4 6.4 5.7 2.0  
Contingency | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 8.0 8.1 8.1 8.3 8.5 8.7 8.6 9.6    
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 8.1 8.1 8.1 8.3 8.4 8.5 7.1 5.3    
Contingency | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 3.6 3.6 3.6 3.6 3.6 4.2 5.5      
Total IBNR liabilities plus expected development on reported claims 0.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 3.3 3.3 3.3 3.3 3.3 3.0 1.8      
Contingency | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 4.7 4.7 4.7 5.2 7.0 4.2        
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 4.5 4.5 4.5 4.4 3.7 1.6        
Contingency | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 8.9 8.9 9.0 9.6 9.9          
Total IBNR liabilities plus expected development on reported claims 0.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 8.7 7.8 7.8 7.1 2.8          
Contingency | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 17.3 17.0 18.0 17.6            
Total IBNR liabilities plus expected development on reported claims 0.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 16.8 16.0 15.2 11.6            
Contingency | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 11.2 10.6 9.7              
Total IBNR liabilities plus expected development on reported claims 0.8                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 9.4 7.0 3.0              
Contingency | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 9.0 9.4                
Total IBNR liabilities plus expected development on reported claims 1.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 6.2 1.8                
Contingency | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 3.0                  
Total IBNR liabilities plus expected development on reported claims 1.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.3                  
Casualty                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 220.8                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 22.7                  
All outstanding liabilities before 2010, net of reinsurance       3.9            
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 202.0                  
Casualty | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.5 0.5 0.6 0.6 0.9 1.1 1.4 1.6 1.5 1.7
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.3 0.4 0.4 0.3 0.4 0.2 0.1 0.1 0.0 0.0
Casualty | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.2 0.2 0.2 0.2 0.3 0.3 0.4 0.4 0.5  
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.2 0.2 0.2 0.2 0.2 0.1 0.1 0.0 0.0  
Casualty | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.4 0.5 0.5 0.5 0.5 0.4 0.2 0.2    
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.3 0.2 0.2 0.1 0.2 0.1 0.0 0.0    
Casualty | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.5 0.5 0.5 0.4 0.4 0.4 0.4      
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.5 0.4 0.4 0.3 0.2 0.1 0.1      
Casualty | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.6 0.5 0.5 0.5 0.4 0.4        
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.5 0.4 0.4 0.4 0.2 0.1        
Casualty | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.6 0.5 0.6 0.8 0.5          
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.4 0.4 0.4 0.4 0.2          
Casualty | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.1 0.3 0.3 0.2            
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.2 0.1 0.1 0.0            
Casualty | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 12.5 9.7 9.7              
Total IBNR liabilities plus expected development on reported claims 7.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1.6 0.6 0.0              
Casualty | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 63.5 53.4                
Total IBNR liabilities plus expected development on reported claims 41.3                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 8.1 2.0                
Casualty | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 141.9                  
Total IBNR liabilities plus expected development on reported claims 116.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 10.6                  
Runoff & Other                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 579.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 545.8                  
All outstanding liabilities before 2010, net of reinsurance       397.2            
Liabilities for loss and allocated loss adjustment expenses, net of reinsurance 430.6                  
Runoff & Other | Accident Year, 2010                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 291.5 287.0 287.7 287.6 286.6 285.1 284.0 283.4 283.2 282.3
Total IBNR liabilities plus expected development on reported claims 5.4                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 281.3 280.9 280.2 278.3 276.4 272.8 269.6 265.5 263.2 $ 160.1
Runoff & Other | Accident Year, 2011                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 223.9 225.0 225.4 225.9 225.0 224.5 223.9 222.8 221.5  
Total IBNR liabilities plus expected development on reported claims 2.9                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 219.3 218.8 218.2 216.7 214.7 213.0 211.2 209.0 $ 206.9  
Runoff & Other | Accident Year, 2012                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 3.7 3.9 4.1 4.1 4.2 4.1 4.0 3.6    
Total IBNR liabilities plus expected development on reported claims 1.1                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 2.7 2.5 2.4 2.4 2.2 1.8 1.3 $ 0.3    
Runoff & Other | Accident Year, 2013                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.4 0.2 0.1 0.2 0.2 0.2 1.2      
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.2 0.1 0.1 0.1 0.1 0.1 $ 0.7      
Runoff & Other | Accident Year, 2014                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.5 0.5 0.4 0.3 0.2 0.2        
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.5 0.3 0.2 0.1 0.0 $ 0.0        
Runoff & Other | Accident Year, 2015                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 18.0 18.0 17.5 15.7 9.5          
Total IBNR liabilities plus expected development on reported claims 0.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 17.3 16.6 15.3 10.0 $ 5.2          
Runoff & Other | Accident Year, 2016                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 11.6 11.7 12.1 11.8            
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 11.3 11.0 10.1 $ 6.2            
Runoff & Other | Accident Year, 2017                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.7 0.7 0.6              
Total IBNR liabilities plus expected development on reported claims 0.0                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 0.6 0.5 $ 0.4              
Runoff & Other | Accident Year, 2018                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 28.6 30.3                
Total IBNR liabilities plus expected development on reported claims 2.6                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 12.6 $ 7.9                
Runoff & Other | Accident Year, 2019                    
Reserves for unpaid losses and loss adjustment expenses                    
Incurred losses and allocated loss adjustment expenses, net of reinsurance 0.3                  
Total IBNR liabilities plus expected development on reported claims 0.2                  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance $ 0.0