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Property and Casualty Insurance Reserves - Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Property and Casualty Insurance Reserves, Net of Reinsurance | $ 1,756.7
Reinsurance Recoverables on Unpaid Losses and Allocated LAE | 50.1
Unallocated LAE | 175.7
Property and Casualty Insurance Reserves, Gross of Reinsurance | 1,982.5
Specialty Personal Automobile Insurance—Liability |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Property and Casualty Insurance Reserves, Net of Reinsurance | 1,112.5
Reinsurance Recoverables on Unpaid Losses and Allocated LAE | 9.3
Specialty Personal Automobile Insurance—Physical Damage |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Property and Casualty Insurance Reserves, Net of Reinsurance | 53.5
Commercial Automobile Insurance—Liability |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Property and Casualty Insurance Reserves, Net of Reinsurance | 209.1
Reinsurance Recoverables on Unpaid Losses and Allocated LAE | 5.8
Commercial Automobile Insurance—Physical Damage |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Property and Casualty Insurance Reserves, Net of Reinsurance | 6.3
Preferred Personal Automobile Insurance—Liability |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Property and Casualty Insurance Reserves, Net of Reinsurance | 232.6
Reinsurance Recoverables on Unpaid Losses and Allocated LAE | 23.2
Preferred Personal Automobile Insurance—Physical Damage |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Property and Casualty Insurance Reserves, Net of Reinsurance | 4.4
Homeowners Insurance |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Property and Casualty Insurance Reserves, Net of Reinsurance | 88.4
Reinsurance Recoverables on Unpaid Losses and Allocated LAE | 7.6
Other |
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items] |
Property and Casualty Insurance Reserves, Net of Reinsurance | 49.9
Reinsurance Recoverables on Unpaid Losses and Allocated LAE | $ 4.2

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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=116884095&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=116884095&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=116884095&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=116884095&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=116884468&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=116884468&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=116884468&loc=SL65671315-158438 + Details
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