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Commitments and Contingencies (Details) £ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jul. 01, 2022 GBP (£)	Jun. 30, 2022 GBP (£)	May 05, 2021 USD ($)
Other Commitments [Line Items]
FAL Deposit return by cash		$ 5,500,000		$ 5,500,000
Fair value of contingent consideration in NORCAL acquisition		0	$ 24,000,000	0	$ 24,000,000
NORCAL Group
Other Commitments [Line Items]
Contingent consideration, maximum estimate								$ 84,000,000
Fair value of contingent consideration in NORCAL acquisition		24,000,000		$ 24,000,000
Data Analytics Services
Other Commitments [Line Items]
Non-renew notice, period				6 months
Purchase commitment, period	3 years
Annual fee	$ 3,500,000
Extension period for long-term purchase commitment				1 year
Operating expense		900,000	$ 600,000	$ 1,800,000	$ 1,200,000
Purchase obligation		8,100,000		8,100,000
Funding Commitments
Other Commitments [Line Items]
Commitments total		223,700,000		223,700,000
Lloyd's Syndicates
Other Commitments [Line Items]
Unused commitments to extend credit		36,500,000		36,500,000			£ 30.0
Current lending capacity under revolving credit agreement		$ 18,300,000		$ 18,300,000
Non-renew notice, period				30 days
Auto-renewal period prior to maturity date				1 year
Interest rate on revolving credit agreement		3.80%		3.80%			3.80%
Outstanding borrowings		$ 0		$ 0
Required FAL deposit		$ 30,300,000		$ 30,300,000
Lloyd's Syndicates | Subsequent event
Other Commitments [Line Items]
Current lending capacity under revolving credit agreement | £						£ 15.0

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Amount of current lending capacity under the Syndicate credit agreement without considering any amounts currently outstanding under the facility.

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The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement.

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Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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