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Property and Casualty Insurance Reserves Short-duration Insurance Contracts, 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 ($)
Claims Development [Line Items]          
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net $ 1,601.2        
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 (0.7)        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 35.5        
Commercial Automobile Insurance - Physical Damage [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 1.9        
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 13.2        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 218.0        
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 6.2        
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 15.3        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 1,006.7        
Homeowners [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 5.8        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 94.1        
Commercial Automobile Insurance-Liability [Member]          
Claims Development [Line Items]          
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented 1.0        
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net 175.6        
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 332.1 $ 332.1 $ 331.8 $ 332.2 $ 347.2
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (0.4)        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 209,277        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 333.1 333.1 332.9 334.5 315.0
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Commercial Automobile Insurance - Physical Damage [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 18.0 18.0 18.1 18.1 18.7
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 8,465        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 18.0 18.1 18.1 18.1 17.1
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 203.5 202.8 200.2 198.3 202.1
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.4        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 46,268        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 197.7 188.3 168.8 143.3 85.8
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 121.4 121.4 121.4 121.6 122.0
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 85,373        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 121.5 121.5 121.5 121.8 121.0
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 830.5 851.1 798.8 838.1 827.7
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 11.8        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 364,671        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 812.4 800.2 768.8 682.8 389.1
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 204.6 204.8 205.0 208.5 211.1
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.1        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 21,959        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 203.2 202.8 200.1 194.4 149.2
Short-duration Insurance Contracts, Accident Year 2014 [Member] | Commercial Automobile Insurance-Liability [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 87.2 89.6 87.9 84.1 87.8
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.4        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 78,900        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 84.6 76.7 69.1 54.5 $ 27.9
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 406.5 406.7 407.1 403.8  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 230,872        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 406.4 406.7 408.8 382.4  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Commercial Automobile Insurance - Physical Damage [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 21.7 21.7 21.6 21.5  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 9,642        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 21.7 21.7 21.6 20.2  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 177.6 176.5 171.8 168.3  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 1.0        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 39,037        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 163.1 147.5 122.4 73.1  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 100.6 100.6 100.7 101.2  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.0        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 68,486        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 100.6 100.7 101.0 100.1  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 972.3 965.1 855.1 965.1  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 18.5        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 400,513        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 934.7 898.9 794.9 450.5  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 164.3 163.2 164.9 178.9  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (0.4)        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 17,296        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 161.3 158.0 154.4 116.9  
Short-duration Insurance Contracts, Accident Year 2015 [Member] | Commercial Automobile Insurance-Liability [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 112.3 112.9 106.9 102.5  
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 2.5        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 94,291        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 100.3 88.6 70.2 $ 34.8  
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 456.9 456.9 462.2    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (0.1)        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 246,102        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 458.0 460.2 436.4    
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Commercial Automobile Insurance - Physical Damage [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 24.1 24.2 24.2    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.1        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 10,557        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 24.1 24.2 22.4    
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 179.1 174.5 162.1    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 4.8        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 36,778        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 145.6 114.6 61.2    
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 106.3 106.6 106.6    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (0.1)        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 69,633        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 106.3 106.9 105.2    
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 1,027.2 1,021.6 969.4    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 36.7        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 416,367        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 943.4 831.1 459.7    
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 204.2 201.7 200.3    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 1.4        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 18,146        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 195.8 190.1 141.2    
Short-duration Insurance Contracts, Accident Year 2016 [Member] | Commercial Automobile Insurance-Liability [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 115.6 112.4 120.5    
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 6.7        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 112,468        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 89.7 71.6 $ 36.2    
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 465.6 475.6      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (0.5)        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 251,672        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 468.7 443.0      
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Commercial Automobile Insurance - Physical Damage [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 23.5 24.2      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 0.2        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 9,776        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 23.5 22.2      
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 157.8 164.4      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 9.1        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 33,525        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 108.9 59.2      
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 105.8 109.2      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (0.5)        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 66,083        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 106.1 104.4      
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 999.9 997.7      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 69.5        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 394,692        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 808.6 441.9      
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 259.5 261.2      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 7.4        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 18,610        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 242.5 165.8      
Short-duration Insurance Contracts, Accident Year 2017 [Member] | Commercial Automobile Insurance-Liability [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 120.0 120.5      
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 16.6        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 126,680        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 72.3 $ 36.3      
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 504.9        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 40.2        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 261,832        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 463.6        
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Commercial Automobile Insurance - Physical Damage [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 23.6        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 2.5        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 9,158        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 21.7        
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 157.6        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 43.4        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 29,665        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 55.5        
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 113.9        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ (1.7)        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 59,795        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 107.2        
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 1,128.1        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 317.3        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 415,580        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 467.5        
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 185.9        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 21.4        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 13,725        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 127.4        
Short-duration Insurance Contracts, Accident Year 2018 [Member] | Commercial Automobile Insurance-Liability [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 123.2        
Total of IBNR Liabilities Plus Expected Development on Reported Claims $ 52.6        
Short-duration Insurance Contract, Cumulative Number of Reported Claims | claim 151,959        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 36.8        
Short-Duration Insurance Contracts, Accident Years 2014 through 2018 [Member] | Non-standard Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 2,166.0        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 2,129.8        
Short-Duration Insurance Contracts, Accident Years 2014 through 2018 [Member] | Commercial Automobile Insurance - Physical Damage [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 110.9        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 109.0        
Short-Duration Insurance Contracts, Accident Years 2014 through 2018 [Member] | Preferred Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 875.6        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 670.8        
Short-Duration Insurance Contracts, Accident Years 2014 through 2018 [Member] | Preferred Personal Automobile Physical Damage Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 548.0        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 541.7        
Short-Duration Insurance Contracts, Accident Years 2014 through 2018 [Member] | Non-standard Personal Automobile Liability Insurance [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 4,958.0        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 3,966.6        
Short-Duration Insurance Contracts, Accident Years 2014 through 2018 [Member] | Homeowners [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 1,018.5        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net 930.2        
Short-Duration Insurance Contracts, Accident Years 2014 through 2018 [Member] | Commercial Automobile Insurance-Liability [Member]          
Claims Development [Line Items]          
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, 558.3        
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net $ 383.7