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Property and Casualty Insurance Reserves - Reserve Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Gross of Reinsurance at Beginning of Year | $ 1,969.8 |  |
Less Reinsurance Recoverables at Beginning of Year | 122.6 |  |
Incurred Losses and LAE related to: |  |  |
Incurred Losses and LAE Related to Prior Years | 36.4 | $ (71.1) | $ (7.4)
Paid Losses and LAE related to: |  |  |
Plus Reinsurance Recoverables at End of Year | 50.1 | 122.6 |
Property and Casualty Insurance Reserves, Gross of Reinsurance at End of Year | 1,982.5 | 1,969.8 |
Property and Liability Insurance |  |  |
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] |  |  |
Gross of Reinsurance at Beginning of Year | 1,969.8 | 1,874.9 | 1,016.8
Less Reinsurance Recoverables at Beginning of Year | 65.6 | 101.9 | 53.1
Property and Casualty Insurance Reserves, Net of Reinsurance at Beginning of Year | 1,904.2 | 1,773.0 | 963.7
Property and Casualty Insurance Reserves Acquired, Net of Reinsurance |  | 3.6 | 695.1
Incurred Losses and LAE related to: |  |  |
Incurred Losses and LAE Related to Current Year | 2,873.6 | 2,879.5 | 2,093.4
Incurred Losses and LAE Related to Prior Years | 36.4 | (71.1) | (7.4)
Total Incurred Losses and LAE | 2,910.0 | 2,808.4 | 2,086.0
Paid Losses and LAE related to: |  |  |
Paid Losses and LAE Related to Current Year | 1,679.1 | 1,682.1 | 1,300.8
Paid Losses and LAE Related to Prior Years | 1,202.7 | 998.7 | 671.0
Total Paid Losses and LAE | 2,881.8 | 2,680.8 | 1,971.8
Property and Casualty Insurance Reserves, Net of Reinsurance at End of Year | 1,932.4 | 1,904.2 | 1,773.0
Plus Reinsurance Recoverables at End of Year | 50.1 | 65.6 | 101.9
Property and Casualty Insurance Reserves, Gross of Reinsurance at End of Year | $ 1,982.5 | $ 1,969.8 | $ 1,874.9

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- Definition Acquired liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims and indemnification acquired. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References No definition available. + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to casualty insurance insured events that have occurred on or before a particular date (ordinarily, the balance sheet date) and the amount needed to provide for the estimated ultimate cost required to investigate and settle claims relating to insured events that have occurred on or before a particular date (ordinarily, the balance sheet date), whether or not reported to the insurer at that date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs. + 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 (c) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process. + 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 (b) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 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 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 + Details
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