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Short-Duration Insurance Contracts - Claims Development (Details)
$ in Millions
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 ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 1,081.5 $ 1,188.5 $ 1,114.2              
Short-tail | Personal Insurance Segments [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,748.4                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,536.0                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 3.6                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 216.0 229.4 229.6              
Short-tail | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,127.3                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 828.3                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 37.4                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 336.4 360.2 226.4              
Short-tail | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 403.2                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 285.5                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 10.8                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 128.5 210.6 178.9              
Short-tail | Short-duration Insurance Contracts, Accident Year 2010 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 39.8                  
Short-tail | Short-duration Insurance Contracts, Accident Year 2014 [Member] | Personal Insurance Segments [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 274.5 276.0 277.3 $ 274.9 $ 273.2          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 172,775                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 270.5 266.3 254.3 228.4 174.2          
Short-tail | Short-duration Insurance Contracts, Accident Year 2014 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 220.9 226.3 233.7 231.3 227.0          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 8.9                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 38,751                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 206.1 195.9 180.8 151.9 103.0          
Short-tail | Short-duration Insurance Contracts, Accident Year 2014 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 62.0 60.9 58.5 56.9 55.7          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 7,890                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 55.1 49.3 44.0 34.9 22.0          
Short-tail | Short-duration Insurance Contracts, Accident Year 2015 [Member] | Personal Insurance Segments [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 339.0 341.0 345.5 339.0            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 152,951                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 330.7 318.0 290.8 216.5            
Short-tail | Short-duration Insurance Contracts, Accident Year 2015 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 227.3 232.5 239.9 239.4            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 17.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 37,749                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 192.9 169.6 148.3 101.5            
Short-tail | Short-duration Insurance Contracts, Accident Year 2015 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 90.3 87.8 85.4 75.5            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 5.7                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 8,096                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 76.7 62.8 48.3 24.0            
Short-tail | Short-duration Insurance Contracts, Accident Year 2016 [Member] | Personal Insurance Segments [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 361.4 370.0 368.5              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 4.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 151,338                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 342.6 316.2 231.9              
Short-tail | Short-duration Insurance Contracts, Accident Year 2016 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 225.2 227.6 237.0              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 24.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 34,615                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 176.7 147.3 99.2              
Short-tail | Short-duration Insurance Contracts, Accident Year 2016 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 102.7 99.5 99.3              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 17.3                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 7,293                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 69.9 50.2 25.2              
Short-tail | Short-duration Insurance Contracts, Accident Year 2017 [Member] | Personal Insurance Segments [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 355.0 372.4                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 12.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 150,533                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 315.8 236.8                
Short-tail | Short-duration Insurance Contracts, Accident Year 2017 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 225.5 236.8                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 42.8                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 31,502                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 153.9 104.9                
Short-tail | Short-duration Insurance Contracts, Accident Year 2017 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 129.7 134.2                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 26.7                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 8,938                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 77.5 39.0                
Short-tail | Short-duration Insurance Contracts, Accident Year 2018 [Member] | Personal Insurance Segments [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 418.5                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 45.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 141,204                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 276.4                  
Short-tail | Short-duration Insurance Contracts, Accident Year 2018 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 228.4                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 75.6                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 27,685                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 98.7                  
Short-tail | Short-duration Insurance Contracts, Accident Year 2018 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 18.5                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 8.0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 1,937                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 6.3                  
Long-tail | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 479.6                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 332.1                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 34.6                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 182.1 180.8 314.2              
Long-tail | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 329.0                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 154.4                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 3.0                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 177.6 167.9 129.7              
Long-tail | Short-duration Insurance Contracts, Accident Year 2009 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 44.7 45.0 45.5 45.8 46.0 $ 46.3 $ 46.7 $ 46.8 $ 48.1 $ 47.3
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 4,892                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 41.6 41.4 41.1 40.4 40.0 38.7 37.2 33.2 26.4 11.9
Long-tail | Short-duration Insurance Contracts, Accident Year 2009 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 11.9 12.9 12.4 10.6 11.0 11.0 10.4 10.0 11.0 10.3
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.6                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 1,588                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 10.4 10.4 10.0 9.2 9.4 8.6 7.2 4.9 2.4 $ 0.2
Long-tail | Short-duration Insurance Contracts, Accident Year 2010 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net   40.2 40.8 40.4 40.3 40.4 41.6 41.3 38.8  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 5,259                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 36.4 35.8 35.4 34.6 33.2 31.4 28.0 21.6 9.0  
Long-tail | Short-duration Insurance Contracts, Accident Year 2010 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 10.0 10.1 10.3 9.9 9.8 9.7 9.9 10.9 11.2  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.6                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 1,309                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 8.3 8.2 8.1 7.6 7.7 6.5 5.2 2.2 $ 0.8  
Long-tail | Short-duration Insurance Contracts, Accident Year 2011 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 42.9 43.9 44.9 44.8 44.8 45.5 47.4 44.6    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.3                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 12,226                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 38.6 38.1 37.7 36.9 35.0 31.9 25.4 12.4    
Long-tail | Short-duration Insurance Contracts, Accident Year 2011 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 9.7 10.5 10.9 10.1 10.2 10.7 10.7 11.9    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 1,038                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 8.4 8.1 7.9 7.1 6.6 5.2 3.0 $ 0.9    
Long-tail | Short-duration Insurance Contracts, Accident Year 2012 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 41.7 42.9 43.9 44.1 43.7 45.8 49.7      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.7                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 12,760                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 36.4 35.8 34.7 32.7 29.8 23.5 12.6      
Long-tail | Short-duration Insurance Contracts, Accident Year 2012 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 16.0 16.5 17.4 17.6 15.4 16.7 16.7      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.4                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 956                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 14.1 14.0 12.5 10.3 7.3 4.0 $ 0.9      
Long-tail | Short-duration Insurance Contracts, Accident Year 2013 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 41.5 42.9 43.4 44.1 45.4 48.7        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 6.0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 11,313                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 34.2 33.7 32.3 29.0 23.3 12.3        
Long-tail | Short-duration Insurance Contracts, Accident Year 2013 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 15.3 15.9 16.5 17.9 18.9 20.1        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 1,210                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 12.0 10.5 9.0 6.7 3.7 $ 1.1        
Long-tail | Short-duration Insurance Contracts, Accident Year 2014 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 45.3 45.7 47.1 50.0 51.6          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 9.6                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 11,568                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 34.1 32.8 30.0 24.4 12.4          
Long-tail | Short-duration Insurance Contracts, Accident Year 2014 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 29.5 28.3 27.1 25.2 23.3          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 4.5                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 1,507                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 21.5 16.7 12.5 7.2 $ 1.2          
Long-tail | Short-duration Insurance Contracts, Accident Year 2015 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 53.7 56.5 59.4 59.7            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 11.8                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 11,139                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 38.3 35.7 28.2 13.9            
Long-tail | Short-duration Insurance Contracts, Accident Year 2015 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 45.7 44.8 44.9 38.6            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 9.9                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 2,233                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 29.1 20.6 10.9 $ 2.7            
Long-tail | Short-duration Insurance Contracts, Accident Year 2016 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 57.2 60.6 62.6              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 19.2                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 12,427                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 32.3 26.8 12.6              
Long-tail | Short-duration Insurance Contracts, Accident Year 2016 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 64.8 62.9 60.8              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 22.3                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 5,029                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 31.5 15.7 $ 6.0              
Long-tail | Short-duration Insurance Contracts, Accident Year 2017 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 56.4 59.0                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 21.0                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 12,489                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 27.0 13.2                
Long-tail | Short-duration Insurance Contracts, Accident Year 2017 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 73.1 71.6                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 46.6                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 6,125                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 16.4 $ 5.5                
Long-tail | Short-duration Insurance Contracts, Accident Year 2018 [Member] | Commercial insurance                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 56.4                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 32.1                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 11,772                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 13.2                  
Long-tail | Short-duration Insurance Contracts, Accident Year 2018 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 53.0                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 42.3                  
Short-duration Insurance Contract, Cumulative Number of Reported Claims 3,344                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 2.7