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Other Reinsurance (Details) $ in Millions	12 Months Ended
	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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-Topic 944
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-Name Accounting Standards Codification
-Section S99
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
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-Section 50
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