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Reinsurance - Unsecured Reinsurance Recoverable and Prepaid Reinsurance Premium Balances (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Ceded Credit Risk [Line Items]
Unsecured reinsurance recoverable and prepaid reinsurance premium	$ 371.4	$ 356.0
Other reinsurers
Ceded Credit Risk [Line Items]
Unsecured reinsurance recoverable and prepaid reinsurance premium	143.1	160.3
A+
Ceded Credit Risk [Line Items]
Unsecured reinsurance recoverable and prepaid reinsurance premium	228.3	195.7
A+ | Munich Reinsurance America, Inc.
Ceded Credit Risk [Line Items]
Unsecured reinsurance recoverable and prepaid reinsurance premium	60.0	34.3
A+ | Hannover Rück SE
Ceded Credit Risk [Line Items]
Unsecured reinsurance recoverable and prepaid reinsurance premium	56.9	49.9
A+ | Everest Reinsurance Company
Ceded Credit Risk [Line Items]
Unsecured reinsurance recoverable and prepaid reinsurance premium	41.6	55.3
A+ | Digital Advantage Insurance Company
Ceded Credit Risk [Line Items]
Unsecured reinsurance recoverable and prepaid reinsurance premium	24.1	19.4
A+ | Swiss Reinsurance America Corporation
Ceded Credit Risk [Line Items]
Unsecured reinsurance recoverable and prepaid reinsurance premium	18.3	14.0
A+ | Partner Reinsurance Company of the U.S.
Ceded Credit Risk [Line Items]
Unsecured reinsurance recoverable and prepaid reinsurance premium	14.9	15.0
A+ | Sirius America Insurance Company
Ceded Credit Risk [Line Items]
Unsecured reinsurance recoverable and prepaid reinsurance premium	$ 12.5	$ 7.8

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 825
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479383/944-825-50-1B

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- Definition

Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479838/944-20-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479616/944-310-45-5

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

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