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Unpaid Claims and Claim Expenses - Reconciliation of Net Incurred and Paid Claims (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Short-duration Insurance Contracts, Historical Claims Duration |  |
Gross reserves, end of year | $ 425.9 | $ 438.8
Property & Casualty segment |  |
Short-duration Insurance Contracts, Historical Claims Duration |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 233.8 |
Reinsurance recoverables, including reinsurance premium paid | 110.3 |
Unallocated claims adjustment expenses | 18.3 |
Total other than short duration and unallocated claims adjustment expenses | 81.8 |
Property & Casualty segment | Homeowners |  |
Short-duration Insurance Contracts, Historical Claims Duration |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 52.8 |
Reinsurance recoverables, including reinsurance premium paid | 1.4 |
Property & Casualty segment | Auto liability |  |
Short-duration Insurance Contracts, Historical Claims Duration |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 171.5 |
Reinsurance recoverables, including reinsurance premium paid | 99.9 |
Property & Casualty segment | Auto physical damage |  |
Short-duration Insurance Contracts, Historical Claims Duration |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 6.7 |
Property & Casualty segment | Other short duration lines |  |
Short-duration Insurance Contracts, Historical Claims Duration |  |
Liabilities for claims and claim adjustment expenses, net of reinsurance | 2.8 |
Reinsurance recoverables, including reinsurance premium paid | 9.0 |
Property & Casualty segment | Insurance lines other than short duration |  |
Short-duration Insurance Contracts, Historical Claims Duration |  |
Insurance lines other than short duration | $ 63.5 |

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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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