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Property and Casualty Insurance Reserves Short-duration Insurance Contracts, Claims Development (Details)
$ in Millions
Dec. 31, 2016
USD ($)
claim
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Claims Development [Line Items]          
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 807.5        
Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 10.9        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 219.3        
Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented (0.1)        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 0.8        
Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 0.0        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 9.3        
Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 1.5        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 371.7        
Homeowners [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 3.5        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 81.7        
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 282.1 $ 282.2 $ 284.4 $ 290.9 $ 305.0
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.8)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 56,772        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 272.9 264.3 245.5 207.6 117.8
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 164.3 164.2 164.1 163.9 163.9
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.1        
Short-duration Insurance Contracts, Number of Reported Claims | claim 89,703        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 164.3 164.2 164.2 164.4 160.5
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 98.2 98.3 98.4 98.1 96.4
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.0        
Short-duration Insurance Contracts, Number of Reported Claims | claim 35,840        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 98.2 98.2 98.2 98.3 91.2
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 244.0 243.0 242.0 242.1 243.0
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.2)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 63,019        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 242.6 238.9 228.9 202.6 112.8
Short-duration Insurance Contracts, Accident Year 2012 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 226.7 227.5 231.0 235.9 250.2
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.1        
Short-duration Insurance Contracts, Number of Reported Claims | claim 27,833        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 225.8 225.2 222.3 216.0 $ 165.9
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 251.6 250.1 251.1 265.4  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.0        
Short-duration Insurance Contracts, Number of Reported Claims | claim 51,126        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 234.1 216.3 182.2 107.2  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 138.4 138.5 138.5 139.7  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.1        
Short-duration Insurance Contracts, Number of Reported Claims | claim 78,779        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 138.5 138.6 138.9 137.0  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 99.8 100.0 100.3 100.1  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.1)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 36,179        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 99.7 99.9 100.2 93.4  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 249.5 248.3 247.1 250.5  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.5)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 67,058        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 244.2 233.8 208.2 117.8  
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 167.5 169.4 172.8 180.8  
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.1)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 21,976        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 164.7 162.5 156.5 $ 122.4  
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 200.2 198.3 202.1    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.9)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 39,865        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 168.8 143.3 85.8    
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 121.4 121.6 122.0    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.1        
Short-duration Insurance Contracts, Number of Reported Claims | claim 67,205        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 121.5 121.8 121.0    
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 104.3 104.7 105.8    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.7)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 38,042        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 105.1 105.9 97.1    
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 267.1 262.9 255.0    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (5.4)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 76,846        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 245.5 210.8 117.4    
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 205.0 208.5 211.1    
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (0.1)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 22,432        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 200.1 194.4 $ 149.2    
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 171.8 168.3      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (6.3)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 32,484        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 122.4 73.1      
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 100.7 101.2      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 0.4        
Short-duration Insurance Contracts, Number of Reported Claims | claim 53,419        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 101.0 100.1      
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 143.3 143.2      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (1.6)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 42,863        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 143.8 130.0      
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 379.8 379.4      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (10.4)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 91,832        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 304.7 167.7      
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 164.9 178.9      
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (1.8)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 17,432        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 154.4 $ 116.9      
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 162.1        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (26.9)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 30,278        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 61.2        
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 106.6        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 4.2        
Short-duration Insurance Contracts, Number of Reported Claims | claim 49,267        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 105.2        
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 177.9        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (4.0)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 52,039        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 167.4        
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 435.7        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ (72.2)        
Short-duration Insurance Contracts, Number of Reported Claims | claim 108,062        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 168.9        
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 200.3        
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net $ 9.7        
Short-duration Insurance Contracts, Number of Reported Claims | claim 16,769        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 141.2        
Short-Duration Insurance Contracts, Accident Years 2012 through 2016 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,067.8        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 859.4        
Short-Duration Insurance Contracts, Accident Years 2012 through 2016 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 631.4        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 630.5        
Short-Duration Insurance Contracts, Accident Years 2012 through 2016 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 623.5        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 614.2        
Short-Duration Insurance Contracts, Accident Years 2012 through 2016 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 1,576.1        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 1,205.9        
Short-Duration Insurance Contracts, Accident Years 2012 through 2016 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net 964.4        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 886.2