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Debt - Narrative (Details) € in Millions			1 Months Ended				3 Months Ended		9 Months Ended
Debt - Narrative (Details) € in Millions	Apr. 29, 2022 USD ($)	Sep. 08, 2021 USD ($)	Sep. 30, 2021 USD ($)	Aug. 31, 2021	Jul. 31, 2021	Mar. 31, 2007 USD ($)	Sep. 30, 2022 USD ($) credit_facility	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) credit_facility	Sep. 30, 2021 USD ($)	Sep. 30, 2022 EUR (€) credit_facility	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Aug. 11, 2021 USD ($)	Jul. 13, 2021 USD ($)	Jul. 13, 2021 EUR (€)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument
Debt							$ 615,500,000		$ 615,500,000				$ 420,900,000
Debt covenant, maximum loan to value percent, period one							50.00%		50.00%		50.00%
Debt covenant, maximum loan to value percent, period two							40.00%		40.00%		40.00%
Debt covenant, maximum loan to value percent, period three							25.00%		25.00%		25.00%
Debt covenant, maximum loan to value percent, period four							15.00%		15.00%		15.00%
Debt covenant, maximum loan to value percent, period five							0.00%		0.00%		0.00%
Debt covenant, maximum loan to value percent							35.00%		35.00%		35.00%
Other
Debt Instrument
Secured credit facilities \| credit_facility							5		5		5
Ark
Debt Instrument
Debt							$ 180,000,000.0		$ 180,000,000.0				185,900,000
Unsecured Subordinated Debt \| Group Ark Insurance Limited
Debt Instrument
Borrowings								$ 157,800,000
Unsecured Subordinated Debt \| Group Ark Insurance Limited \| Ark
Debt Instrument
Notes issued			$ 163,300,000					163,300,000		$ 163,300,000
HG Global Senior Notes \| Secured Debt
Debt Instrument
Borrowings	$ 150,000,000
Annual payments							15,000,000		15,000,000
Interest reserve account							26,400,000		$ 26,400,000
Additional interest rate									1.00%
Outstanding balance							150,000,000.0		$ 150,000,000.0
Debt							146,400,000		146,400,000
HG Global Senior Notes \| Secured Debt \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt Instrument
Basis spread on variable rate	6.30%
Ark 2007 Subordinated Notes, carrying value \| Ark Subordinated Debt
Debt Instrument
Outstanding balance							30,000,000.0		30,000,000.0				30,000,000.0
Ark 2007 Subordinated Notes, carrying value \| Junior Notes \| Ark
Debt Instrument
Face value						$ 30,000,000
Debt							30,000,000		30,000,000
Ark 2007 Subordinated Notes, carrying value \| Junior Notes \| USD-LIBOR \| Ark
Debt Instrument
Basis spread on variable rate						4.60%
Ark 2021 Notes Tranche 1
Debt Instrument
Outstanding balance \| €											€ 39.1
Ark 2021 Notes Tranche 1 \| Ark Subordinated Debt
Debt Instrument
Outstanding balance							37,600,000		37,600,000				44,200,000
Ark 2021 Notes Tranche 1 \| Unsecured Subordinated Debt \| Group Ark Insurance Limited
Debt Instrument
Notes issued															$ 46,300,000	€ 39.1
Ark 2021 Notes Tranche 1 \| Unsecured Subordinated Debt \| Group Ark Insurance Limited \| EURIBOR
Debt Instrument
Basis spread on variable rate					5.75%
Ark 2021 Notes Tranche 2 \| Ark Subordinated Debt
Debt Instrument
Outstanding balance							47,000,000.0		47,000,000.0				47,000,000.0
Ark 2021 Notes Tranche 2 \| Unsecured Subordinated Debt \| Group Ark Insurance Limited
Debt Instrument
Notes issued														$ 47,000,000
Ark 2021 Notes Tranche 2 \| Unsecured Subordinated Debt \| Group Ark Insurance Limited \| USD-LIBOR
Debt Instrument
Basis spread on variable rate				5.75%
Ark 2021 Notes Tranche 3 \| Ark Subordinated Debt
Debt Instrument
Outstanding balance							70,000,000.0		70,000,000.0				70,000,000.0
Ark 2021 Notes Tranche 3 \| Unsecured Subordinated Debt \| Group Ark Insurance Limited
Debt Instrument
Additional interest rate		1.00%
Notes issued		$ 70,000,000
Solvency capital requirement			120.00%
Debt to capital requirement			40.00%
Ark 2021 Notes Tranche 3 \| Unsecured Subordinated Debt \| Group Ark Insurance Limited \| USD-LIBOR
Debt Instrument
Basis spread on variable rate		6.10%
ING LOC Facility \| Secured Debt \| Ark \| Letter of Credit \| Uncollateralized
Debt Instrument
Total commitment under revolving credit facility													50,000,000
Citibank LOC Facility \| Short-term investments \| Asset Pledged as Collateral
Debt Instrument
Investments pledged as collateral							49,800,000		49,800,000				50,000,000
Citibank LOC Facility \| Secured Debt
Debt Instrument
Line of credit							36,200,000		36,200,000
Citibank LOC Facility \| Secured Debt \| Ark \| Letter of Credit \| Collateral Pledged
Debt Instrument
Total commitment under revolving credit facility													100,000,000
Lloyds LOC Facility \| Secured Debt \| Ark \| Letter of Credit \| Collateral Pledged
Debt Instrument
Total commitment under revolving credit facility							50,000,000		50,000,000
Kudu Bank Facility \| Kudu
Debt Instrument
Total commitment under revolving credit facility							300,000,000		300,000,000
Kudu Bank Facility \| Revolving Credit Facility \| Kudu
Debt Instrument
Loss on debt extinguishment									4,100,000
Kudu Bank Facility \| Line of Credit \| Kudu
Debt Instrument
Interest reserve							8,900,000		8,900,000
Kudu Bank Facility \| Term Loan \| Kudu
Debt Instrument
Borrowings							0	0	0	3,000,000.0
Debt			$ 0				$ 0	$ 0	$ 0	$ 0		$ 0	0				$ 0	$ 89,200,000
Percentage of borrowing base							35.00%		35.00%		35.00%
Remaining borrowing capacity under revolving credit facility							$ 39,600,000		$ 39,600,000
Other Operations \| Term Loan
Debt Instrument
Outstanding balance							$ 36,400,000		$ 36,400,000				$ 17,100,000