Commitments and Contingencies - Schedules of Gross Written Premium Concentration of Risk (Details) - Premiums Written Gross - Customer Concentration Risk	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025
AmWINS Group, Inc.
Concentration Risk [Line Items]
Concentration risk, percentage	27.90%	27.00%
Ryan Specialty Group Holdings, Inc.
Concentration Risk [Line Items]
Concentration risk, percentage	22.90%	20.90%
CRC Insurance Services, Inc.
Concentration Risk [Line Items]
Concentration risk, percentage	10.30%	10.70%
Marsh & McLennan Companies
Concentration Risk [Line Items]
Concentration risk, percentage	9.50%	11.60%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 275
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482861/275-10-50-18

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 275
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 275
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147478785/954-310-50-2

+ Details

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References + Details