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Loss And Loss Adjustment Expense Reserves Incurred and Paid Claims Development with IBNR and Claim Counts (Details)
$ in Millions
Dec. 31, 2018
USD ($)
claim
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Claims Development [Line Items]          
Liabilities for claims and claim adjustment expenses, net of reinsurance $ 11,745.0 $ 10,029.8      
Commercial Lines - Physical Damage | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,776.1        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,722.6        
All outstanding liabilities before 2014, net of reinsurance1 0.4        
Liabilities for claims and claim adjustment expenses, net of reinsurance 53.9 51.7      
Commercial Lines - Liability | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 6,011.7        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 3,538.9        
All outstanding liabilities before 2014, net of reinsurance1 31.4        
Liabilities for claims and claim adjustment expenses, net of reinsurance 2,504.2 2,027.4      
Property | Property Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,831.1        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,521.9        
All outstanding liabilities before 2014, net of reinsurance1 5.5        
Liabilities for claims and claim adjustment expenses, net of reinsurance 314.7 245.8      
2014 | Commercial Lines - Physical Damage | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 238.4 238.0 $ 238.6 $ 239.7 $ 240.3
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Cumulative Number of Incurred Claim Counts | claim 59,630        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 238.2 237.9 237.7 238.3 224.6
2014 | Commercial Lines - Liability | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 813.5 823.0 820.3 795.4 822.5
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Cumulative Number of Incurred Claim Counts | claim 74,682        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 771.0 715.3 610.0 438.7 234.0
2014 | Property | Property Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 375.3 376.3 379.7 389.1 415.5
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 2.5        
Cumulative Number of Incurred Claim Counts | claim 40,992        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 371.9 370.3 365.9 351.5 269.2
2015 | Commercial Lines - Physical Damage | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 272.4 273.5 274.1 274.4  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (0.6)        
Cumulative Number of Incurred Claim Counts | claim 62,599        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 272.2 272.0 271.9 248.5  
2015 | Commercial Lines - Liability | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 899.7 914.8 911.1 897.6  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 14.0        
Cumulative Number of Incurred Claim Counts | claim 77,839        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 786.3 675.0 501.5 238.4  
2015 | Property | Property Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 398.8 403.6 416.5 460.0  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 3.8        
Cumulative Number of Incurred Claim Counts | claim 41,980        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 390.1 383.5 372.8 280.3  
2016 | Commercial Lines - Physical Damage | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 378.2 379.8 379.6    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (0.2)        
Cumulative Number of Incurred Claim Counts | claim 74,180        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 376.8 376.9 336.7    
2016 | Commercial Lines - Liability | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,231.1 1,204.8 1,185.8    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 26.4        
Cumulative Number of Incurred Claim Counts | claim 92,730        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 886.0 639.9 298.6    
2016 | Property | Property Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 537.1 541.2 568.6    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 9.6        
Cumulative Number of Incurred Claim Counts | claim 53,582        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 516.9 498.2 415.2    
2017 | Commercial Lines - Physical Damage | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 412.1 415.4      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (2.0)        
Cumulative Number of Incurred Claim Counts | claim 77,170        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 409.4 369.0      
2017 | Commercial Lines - Liability | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,366.6 1,374.1      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 70.9        
Cumulative Number of Incurred Claim Counts | claim 96,905        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 712.9 325.8      
2017 | Property | Property Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 680.9 672.8      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 11.5        
Cumulative Number of Incurred Claim Counts | claim 71,153        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 647.1 506.7      
2018 | Commercial Lines - Physical Damage | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 475.0        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (10.0)        
Cumulative Number of Incurred Claim Counts | claim 83,350        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 426.0        
2018 | Commercial Lines - Liability | Commercial Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,700.8        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 292.5        
Cumulative Number of Incurred Claim Counts | claim 108,792        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 382.7        
2018 | Property | Property Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 839.0        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 159.8        
Cumulative Number of Incurred Claim Counts | claim 58,135        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 595.9        
Agency Channel | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 21,206.4        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 16,762.0        
All outstanding liabilities before 2014, net of reinsurance1 64.6        
Liabilities for claims and claim adjustment expenses, net of reinsurance 4,509.0 3,955.5      
Agency Channel | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 12,082.4        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 12,039.5        
All outstanding liabilities before 2014, net of reinsurance1 0.4        
Liabilities for claims and claim adjustment expenses, net of reinsurance 43.3 26.2      
Agency Channel | 2014 | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 3,611.2 3,654.4 3,633.2 3,627.7 3,702.1
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Cumulative Number of Incurred Claim Counts | claim 701,788        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 3,559.1 3,482.3 3,284.5 2,868.1 1,809.0
Agency Channel | 2014 | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,091.6 2,088.0 2,089.9 2,090.3 2,107.5
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Cumulative Number of Incurred Claim Counts | claim 1,374,721        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,091.0 2,090.7 2,090.6 2,091.6 2,078.8
Agency Channel | 2015 | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 3,815.6 3,798.8 3,773.8 3,774.9  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 55.9        
Cumulative Number of Incurred Claim Counts | claim 704,995        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 3,623.3 3,416.5 2,976.0 1,793.1  
Agency Channel | 2015 | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,131.5 2,134.4 2,137.2 2,136.8  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (3.8)        
Cumulative Number of Incurred Claim Counts | claim 1,336,486        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,134.1 2,134.4 2,138.1 2,106.2  
Agency Channel | 2016 | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 4,152.0 4,130.0 4,082.9    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 69.5        
Cumulative Number of Incurred Claim Counts | claim 740,325        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 3,723.1 3,231.5 1,941.6    
Agency Channel | 2016 | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,401.8 2,398.9 2,423.4    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (2.8)        
Cumulative Number of Incurred Claim Counts | claim 1,398,842        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,402.1 2,406.9 2,391.0    
Agency Channel | 2017 | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 4,485.8 4,474.8      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 188.6        
Cumulative Number of Incurred Claim Counts | claim 777,415        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 3,478.5 2,074.0      
Agency Channel | 2017 | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,638.5 2,635.5      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (11.8)        
Cumulative Number of Incurred Claim Counts | claim 1,513,912        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,643.2 2,599.8      
Agency Channel | 2018 | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 5,141.8        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 802.8        
Cumulative Number of Incurred Claim Counts | claim 839,051        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,378.0        
Agency Channel | 2018 | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,819.0        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (120.8)        
Cumulative Number of Incurred Claim Counts | claim 1,677,878        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,769.1        
Direct Channel | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 19,269.3        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 15,049.4        
All outstanding liabilities before 2014, net of reinsurance1 38.7        
Liabilities for claims and claim adjustment expenses, net of reinsurance 4,258.6 3,685.1      
Direct Channel | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 12,376.2        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 12,357.9        
All outstanding liabilities before 2014, net of reinsurance1 0.1        
Liabilities for claims and claim adjustment expenses, net of reinsurance 18.4 (5.6)      
Direct Channel | 2014 | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,884.1 2,913.6 2,898.1 2,887.4 2,946.8
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Cumulative Number of Incurred Claim Counts | claim 592,145        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,844.0 2,780.0 2,624.2 2,278.0 1,413.0
Direct Channel | 2014 | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 1,861.7 1,859.2 1,861.7 1,862.2 1,889.3
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Cumulative Number of Incurred Claim Counts | claim 1,471,084        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 1,861.4 1,861.8 1,862.7 1,864.1 $ 1,874.6
Direct Channel | 2015 | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 3,399.3 3,354.2 3,328.3 3,330.5  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 44.3        
Cumulative Number of Incurred Claim Counts | claim 659,289        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 3,238.2 3,021.0 2,615.0 1,545.2  
Direct Channel | 2015 | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,090.8 2,093.5 2,097.7 2,110.7  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (4.0)        
Cumulative Number of Incurred Claim Counts | claim 1,540,090        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,093.7 2,094.7 2,100.1 $ 2,094.7  
Direct Channel | 2016 | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 3,871.2 3,843.9 3,819.0    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 58.9        
Cumulative Number of Incurred Claim Counts | claim 735,483        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 3,476.9 2,991.1 1,780.6    
Direct Channel | 2016 | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,477.7 2,475.4 2,521.0    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (3.8)        
Cumulative Number of Incurred Claim Counts | claim 1,676,008        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,479.3 2,485.8 $ 2,505.0    
Direct Channel | 2017 | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 4,209.9 4,209.5      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 167.0        
Cumulative Number of Incurred Claim Counts | claim 770,740        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 3,255.2 1,912.6      
Direct Channel | 2017 | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 2,743.7 2,750.6      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (16.1)        
Cumulative Number of Incurred Claim Counts | claim 1,790,360        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,753.5 $ 2,742.1      
Direct Channel | 2018 | Personal Lines - Liability | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 4,904.8        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 725.4        
Cumulative Number of Incurred Claim Counts | claim 856,025        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 2,235.1        
Direct Channel | 2018 | Personal Lines - Physical Damage | Personal Lines Segment          
Claims Development [Line Items]          
Incurred Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance 3,202.3        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (175.4)        
Cumulative Number of Incurred Claim Counts | claim 2,065,458        
Cumulative Paid Claims and Allocated Claim Adjustment Expenses, Net of Reinsurance $ 3,170.0