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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 ($)
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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 |  |  |  |

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