Debt - Narrative (Details) € in Millions					1 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	Apr. 29, 2022 USD ($)	Sep. 08, 2021 USD ($)	Aug. 11, 2021 USD ($)	Jul. 13, 2021 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2007 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2023	Dec. 31, 2024 USD ($) credit_facility	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 EUR (€) credit_facility	Sep. 17, 2024 USD ($)	Aug. 22, 2024 USD ($)	Jul. 31, 2024	Jun. 28, 2024 USD ($)	Sep. 30, 2022 USD ($)	Jun. 16, 2022 USD ($)	Dec. 31, 2021 USD ($) letterOfCredit	Jul. 13, 2021 EUR (€)	Mar. 23, 2021 USD ($)
Debt Instrument
Repayments of notes									$ 38,100,000	$ 25,700,000	$ 56,700,000
Amount borrowed									575,800,000
Interest expense									60,800,000	62,700,000	40,300,000
Interest paid									61,000,000.0	42,200,000	30,500,000
Subsidiary - HG Global | Interest Rate Cap
Debt Instrument
Notational amount														$ 150,000,000				$ 150,000,000
Interest rate														10.76%				9.76%
Kudu | Interest Rate Cap
Debt Instrument
Notational amount													$ 150,000,000
Interest rate													8.95%
Ark 2007 Subordinated Notes | Junior Subordinated Debt
Debt Instrument
Face value						$ 30,000,000
Repayments of notes									30,000,000
Ark 2007 Subordinated Notes | Junior Subordinated Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument
Basis spread on variable rate						4.60%
Ark 2007 Subordinated Notes | Subordinated Debt
Debt Instrument
Amount borrowed									0	30,000,000.0
Ark 2021 Subordinated Notes | Subordinated Debt
Debt Instrument
Face value					$ 163,300,000		$ 163,300,000
Proceeds from debt, net of debt issuance costs							$ 157,800,000
Ark 2021 Subordinated Notes, Tranche 1 | Subordinated Debt
Debt Instrument
Face value				$ 46,300,000																€ 39.1
Amount borrowed									41,100,000	42,700,000		€ 39.1
Ark 2021 Subordinated Notes, Tranche 1 | Subordinated Debt | Euro Interbank Offered Rate (EURIBOR)
Debt Instrument
Basis spread on variable rate				5.75%
Ark 2021 Subordinated Notes, Tranche 2 | Subordinated Debt
Debt Instrument
Face value			$ 47,000,000
Amount borrowed									47,000,000	47,000,000.0
Ark 2021 Subordinated Notes, Tranche 2 | Subordinated Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument
Basis spread on variable rate			5.75%
Kudu Credit Facility | Secured Debt
Debt Instrument
Face value									300,000,000							$ 350,000,000					$ 300,000,000
Repayments of notes									0	16,900,000	$ 45,200,000
Amount borrowed									245,300,000	$ 210,300,000
Interest rate								4.30%		4.30%					4.45%
Interest reserve account									$ 15,100,000	$ 14,900,000
Debt covenant, maximum loan to value percent									23.60%			23.60%
Percentage of borrowing base									35.00%			35.00%
Kudu Credit Facility | Secured Debt | Debt Covenant, Period 1
Debt Instrument
Debt covenant, loan to value percent									50.00%			50.00%
Kudu Credit Facility | Secured Debt | Debt Covenant, Period 2
Debt Instrument
Debt covenant, loan to value percent									40.00%			40.00%
Kudu Credit Facility | Secured Debt | Debt Covenant, Period 3
Debt Instrument
Debt covenant, loan to value percent									25.00%			25.00%
Kudu Credit Facility | Secured Debt | Debt Covenant, Period 4
Debt Instrument
Debt covenant, loan to value percent									15.00%			15.00%
Kudu Credit Facility | Secured Debt | Debt Covenant, Period 5
Debt Instrument
Debt covenant, loan to value percent									0.00%			0.00%
Kudu Credit Facility | Secured Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument
Basis spread on variable rate								0.25%
Kudu Credit Facility | Secured Debt | Secured Overnight Financing Rate (SOFR)
Debt Instrument
Basis spread on variable rate		0.26%	0.26%
Ark 2021 Subordinated Notes, Tranche 3 | Subordinated Debt
Debt Instrument
Face value		$ 70,000,000
Debt instrument, period for interest rate increase		10 years
Additional interest rate									1.00%
Solvency capital requirement					120.00%
Debt to capital requirement					40.00%
Amount borrowed									$ 70,000,000.0	70,000,000.0
Ark 2021 Subordinated Notes, Tranche 3 | Subordinated Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument
Basis spread on variable rate		6.10%
ING LOC Facility | Line of Credit | Letter of Credit
Debt Instrument
Number of letter of credit agreements | letterOfCredit																			2
Total commitment under revolving credit facility																			$ 50,000,000
Citibank LOC Facility | Line of Credit | Letter of Credit
Debt Instrument
Total commitment under revolving credit facility																			$ 125,000,000
Letters of credit outstanding									101,700,000
Pledged collateral									141,100,000
Lloyds LOC Facility | Line of Credit | Letter of Credit
Debt Instrument
Total commitment under revolving credit facility																	$ 100,000,000
Letters of credit outstanding									42,700,000
Pledged collateral									$ 67,100,000
HG Global Senior Notes | Senior Notes
Debt Instrument
Face value	$ 150,000,000
Additional interest rate									1.00%
Amount borrowed									$ 150,000,000	150,000,000.0
Interest rate	6.00%
Anniversary of funding date	5 years
Annual payments	$ 15,000,000
Interest accrued multiplier																		8
Interest reserve account, maximum									29,300,000
Interest reserve account									29,300,000	30,400,000
HG Global Senior Notes | Senior Notes | Secured Overnight Financing Rate (SOFR)
Debt Instrument
Basis spread on variable rate	0.26%
Other Operations debt | Secured Debt
Debt Instrument
Amount borrowed									$ 22,400,000	$ 28,900,000
Secured credit facilities | credit_facility									4			4