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v3.25.0.1

Other Reinsurance (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) employees director | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Effects of Reinsurance [Line Items] |  |  |
Reinsurance recoverables | $ 78.7 | $ 86.5 |
Ceded earned premiums | 33.1 | 32.7 | $ 42.7
Assumed earned premiums | 10.5 | 29.7 | 26.3
Short duration policies |  |  |
Effects of Reinsurance [Line Items] |  |  |
Reinsurance recoverables | 26.0 | 34.1 |
Long-duration policies |  |  |
Effects of Reinsurance [Line Items] |  |  |
Reinsurance recoverables | 52.7 | 52.4 |
Catastrophe Reinsurance |  |  |
Effects of Reinsurance [Line Items] |  |  |
Ceded earned premiums | 16.4 | 16.3 | 32.0
Non-Catastrophe Reinsurance |  |  |
Effects of Reinsurance [Line Items] |  |  |
Assumed earned premiums | $ 21.8 | 42.9 | 41.4
Capitol County Mutual Fire Insurance Company |  |  |
Effects of Reinsurance [Line Items] |  |  |
Number of employee board members | employees | 5 |  |
Number of board of director members | director | 5 |  |
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 | $ 10.5 | 10.4 | 11.9
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 | $ 2.3 | $ 2.7 | $ 3.2
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 -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-17(Column D)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 605 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479032/944-605-50-1 + Details
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