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v3.22.0.1

Other Reinsurance (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) employees director | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Effects of Reinsurance [Line Items] |  |  |
Ceded earned premiums | $ 36.1 | $ 31.2 | $ 27.4
Assumed earned premiums | 34.7 | 50.8 | 92.3
Catastrophe Reinsurance |  |  |
Effects of Reinsurance [Line Items] |  |  |
Ceded earned premiums | 30.3 | 26.7 | 20.5
Non-Catastrophe Reinsurance |  |  |
Effects of Reinsurance [Line Items] |  |  |
Assumed earned premiums | $ 56.7 | 73.8 | 92.3
Capitol County Mutual Fire Insurance Company |  |  |
Effects of Reinsurance [Line Items] |  |  |
Number of employee board members | employees | 6 |  |
Number of board of director members | director | 6 |  |
Old Reliable Casualty Company |  |  |
Effects of Reinsurance [Line Items] |  |  |
Number of employee board members | employees | 9 |  |
Number of board of director members | director | 9 |  |
Capitol County Mutual Fire Insurance Company |  |  |
Effects of Reinsurance [Line Items] |  |  |
Assumed earned premiums | $ 17.3 | 18.1 | 19.4
Capitol County Mutual Fire Insurance Company | Trinity |  |  |
Effects of Reinsurance [Line Items] |  |  |
Percentage of written business assumed | 100.00% |  |
Old Reliable Casualty Company |  |  |
Effects of Reinsurance [Line Items] |  |  |
Assumed earned premiums | $ 4.7 | $ 4.9 | $ 5.2
Old Reliable Casualty Company | Trinity |  |  |
Effects of Reinsurance [Line Items] |  |  |
Percentage of written business assumed | 100.00% |  |

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- Definition Amount of earned premiums assumed from other entities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 235 -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column D)) -URI http://asc.fasb.org/extlink&oid=120401096&loc=d3e574992-122915 + Details
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