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Liabilities For Outstanding Claims, Losses And Loss Adjustment Expenses (Schedule of Incurred Claims Development) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
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 ($)
Dec. 31, 2009
USD ($)
Commercial Multiple Peril Line [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance $ 3,357.8                  
Cumulative Paid Losses and ALAE, Net of Reinsurance 2,334.6                  
Unallocated loss adjustment expense 19.3                  
Net reserves 1,095.7                  
Commercial Multiple Peril Line [Member] | Year 2011 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 476.6 $ 474.9 $ 475.6 $ 459.7 $ 456.2 $ 462.8 $ 480.0      
IBNR $ 8.8                  
Cumulative Incurred Claim Count | claim 16,983                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 454.9 442.8 424.2 389.3 350.8 307.5 175.8      
Commercial Multiple Peril Line [Member] | Year 2012 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 393.0 392.1 391.8 367.9 362.5 380.0        
IBNR $ 10.2                  
Cumulative Incurred Claim Count | claim 14,830                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 355.9 334.6 306.4 262.3 221.5 137.6        
Commercial Multiple Peril Line [Member] | Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 449.1 459.4 464.8 439.6 443.9          
IBNR $ 22.6                  
Cumulative Incurred Claim Count | claim 15,922                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 395.2 363.4 316.0 267.8 171.7          
Commercial Multiple Peril Line [Member] | Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 467.4 463.7 456.3 446.0            
IBNR $ 33.0                  
Cumulative Incurred Claim Count | claim 15,731                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 363.2 315.6 260.1 161.9            
Commercial Multiple Peril Line [Member] | Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 448.7 449.6 447.1              
IBNR $ 55.5                  
Cumulative Incurred Claim Count | claim 15,981                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 290.2 237.9 140.3              
Commercial Multiple Peril Line [Member] | Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 544.8 538.7                
IBNR $ 122.2                  
Cumulative Incurred Claim Count | claim 16,674                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 296.4 170.9                
Commercial Multiple Peril Line [Member] | Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 578.2                  
IBNR $ 228.3                  
Cumulative Incurred Claim Count | claim 16,716                  
Commercial Multiple Peril Line [Member] | Years 2010 And Prior [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years $ 53.2                  
Commercial Multiple Peril Line [Member] | Years 2011 To 2017 [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 1,023.2                  
Commercial Multiple Peril Line [Member] | Year 2018 [Member]                    
Claims Development [Line Items]                    
Cumulative Paid Losses and ALAE, Net of Reinsurance 178.8                  
Workers' Compensation Line [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 1,486.7                  
Cumulative Paid Losses and ALAE, Net of Reinsurance 1,001.9                  
Unallocated loss adjustment expense 17.0                  
Net reserves 592.9                  
Workers' Compensation Line [Member] | Year 2008 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 78.7 77.9 77.5 77.5 79.2 79.4 80.3 $ 82.5 $ 87.6 $ 93.8
IBNR $ 1.9                  
Cumulative Incurred Claim Count | claim 8,032                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 73.1 72.4 70.8 69.8 68.6 65.4 61.6 54.6 41.2 $ 19.2
Workers' Compensation Line [Member] | Year 2009 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 116.5 115.9 114.7 114.9 116.3 115.9 115.8 116.9 115.5  
IBNR $ 3.3                  
Cumulative Incurred Claim Count | claim 10,174                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 107.2 106.3 104.2 101.0 96.5 89.5 76.9 57.2 $ 22.1  
Workers' Compensation Line [Member] | Year 2010 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 147.9 148.3 146.7 143.8 145.5 144.3 144.2 141.4    
IBNR $ 7.1                  
Cumulative Incurred Claim Count | claim 12,465                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 132.8 130.9 128.0 122.9 114.0 97.3 71.3 30.0    
Workers' Compensation Line [Member] | Year 2011 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 163.7 163.7 162.9 157.2 165.2 171.1 176.3      
IBNR $ 10.2                  
Cumulative Incurred Claim Count | claim 13,042                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 141.4 136.0 130.7 120.1 102.6 74.8 30.4      
Workers' Compensation Line [Member] | Year 2012 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 155.4 155.3 154.4 160.1 167.4 179.3        
IBNR $ 12.3                  
Cumulative Incurred Claim Count | claim 11,683                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 127.4 122.8 114.0 101.2 74.6 30.9        
Workers' Compensation Line [Member] | Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 150.3 152.1 154.7 172.9 182.1          
IBNR $ 15.2                  
Cumulative Incurred Claim Count | claim 10,880                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 112.5 105.6 92.3 70.5 30.6          
Workers' Compensation Line [Member] | Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 150.3 157.5 164.2 189.6            
IBNR $ 22.5                  
Cumulative Incurred Claim Count | claim 11,417                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 99.4 87.2 65.7 28.0            
Workers' Compensation Line [Member] | Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 164.6 180.5 189.6              
IBNR $ 24.5                  
Cumulative Incurred Claim Count | claim 15,790                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 99.5 78.1 33.9              
Workers' Compensation Line [Member] | Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 172.1 186.1                
IBNR $ 35.4                  
Cumulative Incurred Claim Count | claim 16,405                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 73.0 32.8                
Workers' Compensation Line [Member] | Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 187.2                  
IBNR $ 69.4                  
Cumulative Incurred Claim Count | claim 15,711                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 35.6                  
Workers' Compensation Line [Member] | Years 2008 To 2017 [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 484.8                  
Workers' Compensation Line [Member] | Years 2007 And Prior [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 91.1                  
Commercial Automobile Line [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 1,099.8                  
Cumulative Paid Losses and ALAE, Net of Reinsurance 711.1                  
Unallocated loss adjustment expense 4.9                  
Net reserves 408.0                  
Commercial Automobile Line [Member] | Year 2012 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 231.0 225.6 227.5 205.3 179.4   177.7      
IBNR $ 1.4                  
Cumulative Incurred Claim Count | claim 15,274                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 214.9 200.6 176.3 137.6 89.6   35.9      
Commercial Automobile Line [Member] | Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 185.1 181.7 177.3 163.3 168.5          
IBNR $ 6.4                  
Cumulative Incurred Claim Count | claim 13,477                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 168.2 137.1 102.7 70.8 33.1          
Commercial Automobile Line [Member] | Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 167.8 166.9 168.3 163.4            
IBNR $ 10.0                  
Cumulative Incurred Claim Count | claim 12,838                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 129.3 96.4 63.8 32.2            
Commercial Automobile Line [Member] | Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 163.0 157.7 157.0              
IBNR $ 16.4                  
Cumulative Incurred Claim Count | claim 11,629                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 98.3 60.7 27.8              
Commercial Automobile Line [Member] | Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 170.1 159.5                
IBNR $ 43.4                  
Cumulative Incurred Claim Count | claim 11,343                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 71.2 26.9                
Commercial Automobile Line [Member] | Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 182.8                  
IBNR $ 110.7                  
Cumulative Incurred Claim Count | claim 10,338                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 29.2                  
Commercial Automobile Line [Member] | Years 2012 To 2017 [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 388.7                  
Commercial Automobile Line [Member] | Years 2011 And Prior [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 14.4                  
General Liability And Umbrella - Occurrence [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 712.0                  
Cumulative Paid Losses and ALAE, Net of Reinsurance 348.7                  
Unallocated loss adjustment expense 11.5                  
Net reserves 400.6                  
General Liability And Umbrella - Occurrence [Member] | Year 2010 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 57.5 55.4 55.6 51.0 42.2 38.2 43.8 47.6    
IBNR $ 3.3                  
Cumulative Incurred Claim Count | claim 1,398                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 50.6 47.8 45.8 39.8 31.1 19.4 6.7 $ 1.6    
General Liability And Umbrella - Occurrence [Member] | Year 2011 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 69.1 74.2 71.1 64.3 62.2 59.3 77.2      
IBNR $ 3.7                  
Cumulative Incurred Claim Count | claim 1,779                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 63.0 60.6 52.1 43.8 29.8 12.6 $ 2.2      
General Liability And Umbrella - Occurrence [Member] | Year 2012 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 81.2 84.4 88.6 71.5 67.4 84.1        
IBNR $ 8.2                  
Cumulative Incurred Claim Count | claim 2,031                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 63.5 56.1 43.1 26.8 11.0 2.4        
General Liability And Umbrella - Occurrence [Member] | Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 98.3 101.4 98.6 82.3 100.9          
IBNR $ 10.6                  
Cumulative Incurred Claim Count | claim 2,133                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 70.4 52.8 31.4 14.5 3.1          
General Liability And Umbrella - Occurrence [Member] | Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 97.0 99.6 99.3 104.2            
IBNR $ 21.3                  
Cumulative Incurred Claim Count | claim 2,550                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 48.5 30.8 15.2 3.3            
General Liability And Umbrella - Occurrence [Member] | Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 101.5 100.7 95.6              
IBNR $ 33.9                  
Cumulative Incurred Claim Count | claim 2,015                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 31.6 15.0 3.1              
General Liability And Umbrella - Occurrence [Member] | Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 107.6 97.7                
IBNR $ 54.2                  
Cumulative Incurred Claim Count | claim 1,844                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 17.0 4.4                
General Liability And Umbrella - Occurrence [Member] | Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 99.8                  
IBNR $ 74.4                  
Cumulative Incurred Claim Count | claim 1,917                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 4.1                  
General Liability And Umbrella - Occurrence [Member] | Years 2010 To 2017 [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 363.3                  
General Liability And Umbrella - Occurrence [Member] | Years 2009 And Prior [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 25.8                  
General Liability - Claims Made [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 563.7                  
Cumulative Paid Losses and ALAE, Net of Reinsurance 342.8                  
Unallocated loss adjustment expense 4.8                  
Net reserves 229.7                  
General Liability - Claims Made [Member] | Year 2012 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 68.4 69.2 71.4 60.6 55.4 54.9        
IBNR $ 0.9                  
Cumulative Incurred Claim Count | claim 645                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 65.7 64.5 61.1 53.7 36.2 $ 9.3        
General Liability - Claims Made [Member] | Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 82.5 86.2 83.9 69.9 61.7          
IBNR $ 2.9                  
Cumulative Incurred Claim Count | claim 907                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 75.4 71.5 59.1 38.8 11.0          
General Liability - Claims Made [Member] | Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 90.2 98.4 98.8 93.2            
IBNR $ 4.9                  
Cumulative Incurred Claim Count | claim 1,035                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 76.0 64.2 43.6 10.0            
General Liability - Claims Made [Member] | Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 97.1 101.7 103.6              
IBNR $ 18.4                  
Cumulative Incurred Claim Count | claim 1,082                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 66.1 42.9 11.1              
General Liability - Claims Made [Member] | Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 104.6 103.3                
IBNR $ 35.5                  
Cumulative Incurred Claim Count | claim 1,310                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 42.3 12.3                
General Liability - Claims Made [Member] | Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 120.9                  
IBNR $ 59.5                  
Cumulative Incurred Claim Count | claim 2,586                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 17.3                  
General Liability - Claims Made [Member] | Years 2012 To 2017 [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 220.9                  
General Liability - Claims Made [Member] | Years 2011 And Prior [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 4.0                  
Personal Automobile Lines [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 1,756.7                  
Cumulative Paid Losses and ALAE, Net of Reinsurance 1,239.2                  
Unallocated loss adjustment expense 13.8                  
Net reserves 596.7                  
Personal Automobile Lines [Member] | Year 2013 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 312.5 310.2 308.8 304.1 323.1          
IBNR $ 4.7                  
Cumulative Incurred Claim Count | claim 43,356                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 298.4 279.4 241.1 188.6 $ 107.2          
Personal Automobile Lines [Member] | Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 332.4 328.6 334.1 327.4            
IBNR $ 5.6                  
Cumulative Incurred Claim Count | claim 42,358                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 301.9 261.5 205.4 112.9            
Personal Automobile Lines [Member] | Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 355.3 344.5 337.9              
IBNR $ 11.5                  
Cumulative Incurred Claim Count | claim 42,214                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 288.0 213.1 112.8              
Personal Automobile Lines [Member] | Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 362.3 363.6                
IBNR $ 35.0                  
Cumulative Incurred Claim Count | claim 42,200                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 229.2 115.0                
Personal Automobile Lines [Member] | Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 394.2                  
IBNR $ 151.7                  
Cumulative Incurred Claim Count | claim 39,164                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 121.7                  
Personal Automobile Lines [Member] | Years 2013 To 2017 [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 517.5                  
Personal Automobile Lines [Member] | Years 2012 And Prior [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 65.4                  
Homeowners [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 1,115.0                  
Cumulative Paid Losses and ALAE, Net of Reinsurance 971.0                  
Unallocated loss adjustment expense 3.4                  
Net reserves 152.2                  
Homeowners [Member] | Year 2014 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 274.2 272.0   267.1            
IBNR $ 1.7                  
Cumulative Incurred Claim Count | claim 30,436                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 267.5 260.6 253.8 $ 199.9            
Homeowners [Member] | Year 2015 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 231.4 226.5 222.1              
IBNR $ 3.2                  
Cumulative Incurred Claim Count | claim 25,456                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 218.2 207.9 $ 154.3              
Homeowners [Member] | Year 2016 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 296.5 291.4                
IBNR $ 3.4                  
Cumulative Incurred Claim Count | claim 33,394                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 271.6 $ 204.5                
Homeowners [Member] | Year 2017 [Member]                    
Claims Development [Line Items]                    
Incurred Losses and ALAE, Net of Reinsurance 312.9                  
IBNR $ 46.0                  
Cumulative Incurred Claim Count | claim 30,487                  
Cumulative Paid Losses and ALAE, Net of Reinsurance $ 213.7                  
Homeowners [Member] | Years 2015 And 2017 [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years 144.0                  
Homeowners [Member] | Years 2014 And Prior [Member]                    
Claims Development [Line Items]                    
Total reserves for accident years $ 4.8