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Other Reinsurance (Details) $ in Millions	12 Months Ended
	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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 605
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