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Property and Casualty Insurance Reserves Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | $ 1,601.2
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 101.9
Liability for Claims and Claims Adjustment Expense | 1,874.9
Short-duration Insurance Contracts, Liability for Unpaid Claims and Claims Adjustment Expense, Accumulated Unallocated Claim Adjustment Expense | 171.8
Preferred Personal Automobile Liability Insurance [Member] |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 218.0
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 26.9
Preferred Personal Automobile Physical Damage Insurance [Member] |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 6.2
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 0.1
Non-standard Personal Automobile Liability Insurance [Member] |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 1,006.7
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 9.2
Non-standard Personal Automobile Physical Damage Insurance [Member] |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 35.5
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 0.0
Commercial Automobile Insurance-Liability [Member] |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 175.6
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 13.1
Commercial Automobile Insurance - Physical Damage [Member] |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 1.9
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 0.0
Homeowners [Member] |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 94.1
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 42.7
Other Short-duration Insurance Product Line [Member] |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Short-duration Insurance Contracts, Liability for Unpaid Claims and Allocated Claim Adjustment Expense, Net | 63.2
Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | $ 9.9

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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition Amount, after valuation allowance, recoverable under reinsurance contracts for losses reported to the ceding insurer but not yet paid and amounts expected for incurred losses and settlement expenses, which have not yet been reported to the ceding insurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21412-158489 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=99382578&loc=d3e14764-158437 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671315-158438 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671311-158438 + Details
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- Definition Amount of liability for unallocated claim adjustment expense for short-duration insurance contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=99384497&loc=SL65671315-158438 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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