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Debt - Narrative (Details) € in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |
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Jul. 01, 2023 | Apr. 29, 2022 USD ($) | Sep. 08, 2021 USD ($) | Sep. 30, 2021 USD ($) | Aug. 31, 2021 | Jul. 31, 2021 | Mar. 31, 2007 USD ($) | Mar. 31, 2024 USD ($) credit_facility | Mar. 31, 2023 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 | Mar. 31, 2024 EUR (€) credit_facility | Sep. 30, 2022 USD ($) | Jun. 16, 2022 USD ($) | Apr. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) letterOfCredit | Aug. 11, 2021 USD ($) | Jul. 13, 2021 USD ($) | Jul. 13, 2021 EUR (€)
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of notes |  |  |  |  |  |  |  | $ 32,600,000 | $ 20,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Interest Rate Cap | Subsidiary - HG Global |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |
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 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
Outstanding balance |  |  |  |  |  |  |  | 42,400,000 |  |  | $ 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 |  |
Outstanding balance |  |  |  |  |  |  |  | $ 47,000,000.0 |  |  | 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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ark 2021 Subordinated Notes Tranche 3 | Subordinated Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value |  |  | $ 70,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional interest rate |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, period for interest rate increase |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solvency capital requirement |  |  |  | 120.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt to capital requirement |  |  |  | 40.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  |  |  | 111,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Pledged collateral |  |  |  |  |  |  |  | 136,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Lloyds LOC Facility | Line of Credit | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total commitment under revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |
Letters of credit outstanding |  |  |  |  |  |  |  | 35,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Pledged collateral |  |  |  |  |  |  |  | $ 65,000,000 |  |  |  |  |  |  |  |  |  |  |  |
HG Global Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional interest rate |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  |  | $ 150,000,000 |  |  | 150,000,000.0 |  |  |  |  |  |  |  |  |
Stated margin |  | 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 |  |  |  |  |  |  |  | 30,500,000 |  |  | 30,400,000 |  |  |  |  |  |  |  |  |
HG Global Senior Notes | Senior Notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.26% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Kudu Credit Facility | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face value |  |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Repayments of notes |  |  |  |  |  |  |  | 0 | $ 16,900,000 |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  |  | 210,300,000 |  |  | 210,300,000 |  |  |  |  |  |  |  |  |
Stated margin | 4.30% |  |  |  |  |  |  |  |  |  |  | 4.30% |  |  |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  | $ 15,100,000 |  |  | $ 14,900,000 |  |  |  |  |  |  |  |  |
Debt covenant, maximum loan to value percent |  |  |  |  |  |  |  | 23.10% |  |  |  |  | 23.10% |  |  |  |  |  |  |
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) Overnight Index Swap Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 0.26% |  |  |  |  |  |  |  |  |  | 0.26% |  |  |  |  |  |  |  |  |
Other Operations debt | Secured Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |  |  | $ 26,400,000 |  |  | $ 28,900,000 |  |  |  |  |  |  |  |  |
Secured credit facilities | credit_facility |  |  |  |  |  |  |  | 4 |  |  |  |  | 4 |  |  |  |  |  |  |

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