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Short-Duration Insurance Contracts Claims Development (Details)
$ in Millions
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 ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2008
USD ($)
Dec. 31, 2007
USD ($)
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 1,114.2 $ 993.3 $ 923.2              
Personal Insurance Segments [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,581.4                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,353.5                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 0.5                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 228.4 207.4 183.1              
Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 909.3                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 688.4                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 14.0                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 234.9 213.5 183.9              
Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 497.9                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 331.9                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 12.9                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 178.9 165.8 195.3              
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Personal Insurance Segments [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 308.6 308.9 306.7 $ 307.6 $ 305.3          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.9                  
Short-duration Insurance Contracts, Number of Reported Claims 212,774                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 304.5 298.1 285.1 260.2 193.8          
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 169.1 170.9 168.1 170.5 170.3          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.7                  
Short-duration Insurance Contracts, Number of Reported Claims 33,897                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 161.8 156.8 145.8 128.0 91.9          
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 163.7 162.8 164.8 115.6 108.6          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 9.0                  
Short-duration Insurance Contracts, Number of Reported Claims 9,697                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 142.5 122.9 94.7 59.8 25.4          
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Personal Insurance Segments [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 287.6 287.9 283.3 288.6            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.8                  
Short-duration Insurance Contracts, Number of Reported Claims 189,392                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 277.2 265.4 236.9 176.0            
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 176.8 175.2 168.7 170.0            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 6.4                  
Short-duration Insurance Contracts, Number of Reported Claims 33,131                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 158.4 146.0 126.2 79.4            
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 90.9 85.0 82.9 70.9            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 6.7                  
Short-duration Insurance Contracts, Number of Reported Claims 7,680                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 72.0 55.5 37.7 18.2            
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 275.2 272.8 271.2              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 4.0                  
Short-duration Insurance Contracts, Number of Reported Claims 171,772                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 252.1 226.3 172.5              
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 185.6 183.9 181.0              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 15.0                  
Short-duration Insurance Contracts, Number of Reported Claims 32,253                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 150.5 131.3 92.9              
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 58.6 56.9 55.7              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 7.8                  
Short-duration Insurance Contracts, Number of Reported Claims 7,657                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 44.0 34.9 22.0              
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 343.6 337.2                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 20.3                  
Short-duration Insurance Contracts, Number of Reported Claims 151,130                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 288.9 214.9                
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 191.0 189.1                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 31.2                  
Short-duration Insurance Contracts, Number of Reported Claims 30,445                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 130.0 90.4                
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 85.4 75.5                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 21.6                  
Short-duration Insurance Contracts, Number of Reported Claims 7,666                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 48.2 24.0                
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 366.4                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 44.9                  
Short-duration Insurance Contracts, Number of Reported Claims 137,561                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 230.8                  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 186.8                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 49.8                  
Short-duration Insurance Contracts, Number of Reported Claims 25,340                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 87.7                  
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 99.3                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 48.8                  
Short-duration Insurance Contracts, Number of Reported Claims 5,754                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 25.2                  
Long-tail [Domain] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 856.6                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 562.3                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 36.6                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 330.9 306.6 285.6              
Long-tail [Domain] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 209.4                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 81.7                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 2.0                  
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 129.7 91.1 65.4              
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2012 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 77.6 78.0 80.2 85.5 92.8          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 12.2                  
Short-duration Insurance Contracts, Number of Reported Claims 17,321                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 57.3 51.8 43.7 32.6 15.3          
Long-tail [Domain] | 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 17.4 17.6 15.4 16.7 16.7          
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 3.0                  
Short-duration Insurance Contracts, Number of Reported Claims 862                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 12.5 10.3 7.3 4.0 0.9          
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2013 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 84.9 88.2 88.2 92.6            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 19.7                  
Short-duration Insurance Contracts, Number of Reported Claims 16,646                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 57.2 50.1 36.7 16.3            
Long-tail [Domain] | 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 16.5 17.9 18.9 20.1            
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 4.9                  
Short-duration Insurance Contracts, Number of Reported Claims 936                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 9.1 6.7 3.7 1.1            
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2014 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 95.2 96.6 96.1              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 27.3                  
Short-duration Insurance Contracts, Number of Reported Claims 16,501                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 53.9 37.6 15.8              
Long-tail [Domain] | 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 27.1 25.2 23.3              
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 9.5                  
Short-duration Insurance Contracts, Number of Reported Claims 1,044                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 12.5 7.2 1.2              
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2015 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 106.2 108.9                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 45.5                  
Short-duration Insurance Contracts, Number of Reported Claims 15,783                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 38.6 17.3                
Long-tail [Domain] | 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 45.0 38.6                
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 22.8                  
Short-duration Insurance Contracts, Number of Reported Claims 1,409                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 11.0 2.7                
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2016 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 109.5                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 65.6                  
Short-duration Insurance Contracts, Number of Reported Claims 8,548                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 15.4                  
Long-tail [Domain] | 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 60.8                  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 47.6                  
Short-duration Insurance Contracts, Number of Reported Claims 1,401                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 6.0                  
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2007 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 73.3 73.0 72.4 72.5 71.9 $ 71.9 $ 73.2 $ 74.1 $ 73.3 $ 73.4
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.7                  
Short-duration Insurance Contracts, Number of Reported Claims 8,072                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 68.6 68.1 65.7 64.0 61.4 57.6 50.3 43.0 28.7 12.7
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2007 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 4.1 8.3 8.3 8.4 8.5 8.8 9.0 9.4 9.2 9.7
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.4                  
Short-duration Insurance Contracts, Number of Reported Claims 1,101                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 1.6 1.5 1.5 1.3 1.3 0.5 0.1 0.6 0.1 $ 0.0
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2008 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 73.4 74.2 74.9 75.3 75.4 75.0 75.6 79.1 86.1  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 4.0                  
Short-duration Insurance Contracts, Number of Reported Claims 9,577                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 66.0 65.0 64.0 61.3 56.4 51.6 43.9 34.7 14.3  
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2008 [Member] | Specialty Insurance Segment [Member]                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 4.9 6.0 5.8 6.0 6.1 6.8 6.7 6.7 6.4  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 1.6                  
Short-duration Insurance Contracts, Number of Reported Claims 1,502                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 3.0 2.8 2.4 2.1 1.7 1.3 0.8 0.3 $ 0.1  
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2009 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 82.3 82.4 83.1 85.0 86.0 87.4 92.0 90.2    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 5.8                  
Short-duration Insurance Contracts, Number of Reported Claims 10,086                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 74.1 72.1 70.3 66.2 60.2 48.2 34.9 15.2    
Long-tail [Domain] | 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 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 $ 2.0                  
Short-duration Insurance Contracts, Number of Reported Claims 1,429                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 10.0 9.2 9.4 8.6 7.2 4.9 2.4 $ 0.2    
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2010 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 78.9 79.5 82.0 82.2 86.7 93.5 85.3      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 7.2                  
Short-duration Insurance Contracts, Number of Reported Claims 10,644                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 67.6 65.8 63.3 54.2 46.3 33.0 12.9      
Long-tail [Domain] | 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 10.3 9.9 9.8 9.7 9.9 10.9 11.2      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.2                  
Short-duration Insurance Contracts, Number of Reported Claims 1,169                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 8.1 7.6 7.7 6.5 5.2 2.2 $ 0.8      
Long-tail [Domain] | Short-duration Insurance Contracts, Accident Year 2011 [Member] | Business insurance segment                    
Claims Development [Line Items]                    
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 75.3 76.1 77.5 80.9 86.4 86.9        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 9.0                  
Short-duration Insurance Contracts, Number of Reported Claims 17,390                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 63.6 60.7 53.9 46.4 33.9 16.4        
Long-tail [Domain] | 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 10.9 10.1 10.2 10.7 10.7 11.9        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 2.2                  
Short-duration Insurance Contracts, Number of Reported Claims 911                  
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 7.9 $ 7.1 $ 6.6 $ 5.2 $ 3.0 $ 0.9