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Property and Casualty Insurance Reserves Short-duration Insurance Contracts, Claims Development (Details) $ in Millions | Dec. 31, 2017 USD ($) claim | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
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Claims Development [Line Items] |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | $ 883.3 |  |  |  |
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 | 11.4 |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 229.9 |  |  |  |
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 | 4.1 |  |  |  |
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 | 1.2 |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 392.3 |  |  |  |
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 | (0.1) |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 16.0 |  |  |  |
Homeowners [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net, Not Separately Presented | 3.7 |  |  |  |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 120.1 |  |  |  |
Short-duration Insurance Contracts, Accident Year 2013 [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, | 251.8 | $ 251.6 | $ 250.1 | $ 251.1 | $ 265.4
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 0.0 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 51,112 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 241.9 | 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] |  |  |  |  |
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, | 138.4 | 138.4 | 138.5 | 138.5 | 139.7
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (0.1) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 78,778 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 138.5 | 138.5 | 138.6 | 138.9 | 137.0
Short-duration Insurance Contracts, Accident Year 2013 [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, | 248.8 | 249.5 | 248.3 | 247.1 | 250.5
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 0.2 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 66,918 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 247.4 | 244.2 | 233.8 | 208.2 | 117.8
Short-duration Insurance Contracts, Accident Year 2013 [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, | 99.7 | 99.8 | 100.0 | 100.3 | 100.1
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (0.1) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 36,174 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 99.8 | 99.7 | 99.9 | 100.2 | 93.4
Short-duration Insurance Contracts, Accident Year 2013 [Member] | Homeowners [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, | 167.8 | 167.5 | 169.4 | 172.8 | 180.8
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (0.1) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 21,974 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 165.6 | 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] |  |  |  |  |
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, | 202.8 | 200.2 | 198.3 | 202.1 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 0.1 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 39,903 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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 | 121.6 | 122.0 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (0.1) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 67,219 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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, | 266.1 | 267.1 | 262.9 | 255.0 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 3.4 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 76,771 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 258.4 | 245.5 | 210.8 | 117.4 |
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, | 104.3 | 104.3 | 104.7 | 105.8 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (0.5) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 38,048 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 105.1 | 105.1 | 105.9 | 97.1 |
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, | 204.8 | 205.0 | 208.5 | 211.1 |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 0.0 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 22,442 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 202.8 | 200.1 | 194.4 | $ 149.2 |
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, | 176.5 | 171.8 | 168.3 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 1.3 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 32,752 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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 | 100.7 | 101.2 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (0.1) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 53,464 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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, | 381.1 | 379.8 | 379.4 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 0.2 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 91,674 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 359.2 | 304.7 | 167.7 |  |
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, | 143.5 | 143.3 | 143.2 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (0.4) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 42,897 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 143.2 | 143.8 | 130.0 |  |
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, | 163.2 | 164.9 | 178.9 |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (1.2) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 17,444 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 158.0 | 154.4 | $ 116.9 |  |
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, | 174.5 | 162.1 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 9.0 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 30,472 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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, | 106.6 | 106.6 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (0.5) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 49,870 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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, | 437.1 | 435.7 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 16.6 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 105,405 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 346.2 | 168.9 |  |  |
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, | 181.6 | 177.9 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (2.3) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 50,533 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 183.3 | 167.4 |  |  |
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, | 201.7 | 200.3 |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (0.7) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 17,896 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 190.1 | $ 141.2 |  |  |
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, | 164.4 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 39.2 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 28,086 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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, | 109.2 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ (1.2) |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 47,440 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 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, | 444.6 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 102.8 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 103,965 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 175.4 |  |  |  |
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, | 203.6 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 6.3 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 55,303 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 185.2 |  |  |  |
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, | 261.2 |  |  |  |
Total of IBNR Liabilities Plus Expected Development on Reported Claims | $ 17.3 |  |  |  |
Short-duration Insurance Contracts, Number of Reported Claims | claim | 17,011 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 165.8 |  |  |  |
Short-Duration Insurance Contracts, Accident Years 2013 through 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, | 970.0 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 751.5 |  |  |  |
Short-Duration Insurance Contracts, Accident Years 2013 through 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, | 576.2 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 572.0 |  |  |  |
Short-Duration Insurance Contracts, Accident Years 2013 through 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, | 1,777.7 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 1,386.6 |  |  |  |
Short-Duration Insurance Contracts, Accident Years 2013 through 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, | 732.7 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | 716.6 |  |  |  |
Short-Duration Insurance Contracts, Accident Years 2013 through 2017 [Member] | Homeowners [Member] |  |  |  |  |
Claims Development [Line Items] |  |  |  |  |
Incurred Losses and Allocated LAE, Net of Reinsurance For the Years Ended December 31, | 998.7 |  |  |  |
Short-duration Insurance Contracts, Cumulative Paid Claims and Allocated Claim Adjustment Expense, Net | $ 882.3 |  |  |  |

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- Definition Amount, after reinsurance, of paid claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65670685&loc=SL65671311-158438 + Details
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