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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 ($)
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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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.

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-Publisher FASB
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-Section 50
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Undiscounted amount, after reinsurance, of incurred-but-not-reported (IBNR) liabilities plus expected development on reported claims, for claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of incurred claims and allocated claim adjustment expense used in claims development for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts. Excludes unallocated claim adjustment expense.

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Undiscounted amount, after reinsurance, of the liability for unpaid claims and allocated claim adjustment expense for short-duration insurance contracts for accident years not separately presented in claim development information. Excludes unallocated claim adjustment expense.

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