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Business Combination (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 16, 2021 | May 05, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  | $ 24,000,000 | $ 0 | $ 24,000,000 | $ 0 | $ 0
Gain on bargain purchase |  |  | 0 | 0 | 74,408,000 | 0 |
Fair value adjustment on reserves, net |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Present value of future insurance profits, expected amortization |  | $ 38,700,000 |  |  |  |  |
NORCAL Group |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of interest acquired | 1.20% | 98.80% |  |  |  |  |
Total acquisition consideration | $ 3,100,000 | $ 448,809,000 |  |  |  |  |
Payments to acquire business |  | 248,000,000 |  |  |  |  |
Business combination, consideration transferred, equity interests issued and issuable |  | 1,800,000 |  |  |  |  |
Contingent consideration, maximum estimate |  | 84,000,000 |  |  |  |  |
Contingent consideration |  | 24,000,000 | 24,000,000 |  | 24,000,000 |  |
Proassurance actual revenue consolidation results |  |  | 87,800,000 |  | 141,100,000 |  |
Proassurance actual net loss consolidated results |  |  | 1,700,000 |  | (3,300,000) |  |
Transaction-related costs |  |  | $ 2,300,000 | $ 500,000 | $ 23,500,000 | $ 1,600,000 |
Gain on bargain purchase |  | 74,408,000 |  |  |  |  |
Deferred tax asset, net |  | 46,759,000 |  |  |  |  |
Initial base consideration |  | 450,000,000 |  |  |  |  |
Intangible assets |  | 14,000,000 |  |  |  |  |
Business combination, fair values adjustments on gross reserve |  | 42,200,000 |  |  |  |  |
Business combination, fair values adjustments on reinsurance recoverables |  | 3,500,000 |  |  |  |  |
Present value of future insurance profits, expected amortization |  | 53,844,000 |  |  |  |  |
NORCAL Group | Unearned premium VOBA, net |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Present value of future insurance profits, expected amortization |  | 11,676,000 |  |  |  |  |
Estimated negative VOBA |  | 12,400,000 |  |  |  |  |
NORCAL Group | Fair value adjustment on reserves, net |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Present value of future insurance profits, expected amortization |  | 38,701,000 |  |  |  |  |
Estimated negative VOBA |  | 700,000 |  |  |  |  |
NORCAL Group | DDR reserve VOBA |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Present value of future insurance profits, expected amortization |  | 3,467,000 |  |  |  |  |
NORCAL Group | Contribution Certificates |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Principal amount |  | 191,000,000 |  |  |  |  |
Debt instruments |  | $ 175,000,000 |  |  |  |  |

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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6571-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6527-128477 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Amount of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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