Cybersecurity Risk Management and Strategy Disclosure	12 Months Ended
Dec. 31, 2025
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	Risk Identification & Mitigation Cyber risk is incorporated into the Company’s larger enterprise risk management practices, which include efforts to identify, assess, rank, treat, monitor and review risks. Cyber risks are assessed no less than annually by the CIO and CISO. Significant findings from these internal assessments are presented to management for incorporation into the enterprise risk management framework, and appropriate measures to mitigate and monitor the identified risks are developed and implemented. Strategic and emergent cyber-related efforts are shared with the wider information technology team and other stakeholders within the business for both informational and execution purposes. The Company assesses and monitors third-party risks and closely tracks cyber threats such as ransomware and emergent web-based vulnerabilities. A variety of controls exist to minimize the impact of these risks and ensure each is managed within organizational tolerances, which controls are monitored by management for effectiveness. In addition, James River’s Information Security Office conducts cybersecurity risk reviews on new and existing third-party vendors and business partners, which are presented to management so that either appropriate risk mitigation controls can be established with respect to such third-party or the Company can avoid engaging third parties deemed to present an unacceptable level of risk. Independent cybersecurity testing is performed by outside parties on at least an annual basis to identify opportunities for cyber control strengthening in the face of applicable threats. The results of these evaluations are reviewed and prioritized by the CIO and CISO based on their applicability and urgency to address gaps and drive continuous improvement. These findings, along with resultant enhancement and remediation efforts, are communicated with the Company’s Board of Directors. Training The Information Security Office conducts company-wide cybersecurity training, including through an annually required course of online training modules and a continuous email phishing test campaign. In addition, the CISO leads periodic cybersecurity tabletop exercises with company leadership to continually improve the organization’s preparedness for cyber incidents. These exercises consider real-world events that could impact the business and seek to fine-tune response activities in an effort to minimize future cybersecurity incident impacts. See Item 1A. Risk Factors — General Risk Factors "We rely on our systems and employees, and those of certain third-party vendors and service providers in conducting our operations, and failures of these systems, controls or personnel could materially adversely affect our operations" for additional discussion.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	The Company utilizes widely-recognized frameworks based on practices believed to be effective for managing cybersecurity risk, including the development of an organizational understanding of systems, assets, data and capabilities, and the development and implementation of safeguards and processes designed to ensure delivery of services and to detect, respond to and recover from cybersecurity events. Significant time and resources are devoted to the protection of the Company’s systems and data, including the staffing of an experienced internal cybersecurity team, the use of a variety of preventative, detective and recovery tools, and engagement with external service providers to bolster the Company’s cyber defense and response capabilities.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Board Oversight The Company’s Board of Directors provides oversight of the Company’s cybersecurity risks through its Audit Committee. Four of the eight members of the Board of Directors, three of whom are Audit Committee members, possess skills related to information technology and cybersecurity. The Audit Committee reviews the Internal Audit team’s cyber-related control audits to confirm that cyber risks are being appropriately managed and also reviews a periodic report produced by the CIO and CISO on the performance of the Company’s cybersecurity program. In addition, the CIO and CISO present a comprehensive cybersecurity update to the full Board of Directors on at least an annual basis.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Company’s Board of Directors provides oversight of the Company’s cybersecurity risks through its Audit Committee.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Audit Committee reviews the Internal Audit team’s cyber-related control audits to confirm that cyber risks are being appropriately managed and also reviews a periodic report produced by the CIO and CISO on the performance of the Company’s cybersecurity program. In addition, the CIO and CISO present a comprehensive cybersecurity update to the full Board of Directors on at least an annual basis.
Cybersecurity Risk Role of Management [Text Block]	Cyber risks are assessed no less than annually by the CIO and CISO. Significant findings from these internal assessments are presented to management for incorporation into the enterprise risk management framework, and appropriate measures to mitigate and monitor the identified risks are developed and implemented. Strategic and emergent cyber-related efforts are shared with the wider information technology team and other stakeholders within the business for both informational and execution purposes. The Company assesses and monitors third-party risks and closely tracks cyber threats such as ransomware and emergent web-based vulnerabilities. A variety of controls exist to minimize the impact of these risks and ensure each is managed within organizational tolerances, which controls are monitored by management for effectiveness. In addition, James River’s Information Security Office conducts cybersecurity risk reviews on new and existing third-party vendors and business partners, which are presented to management so that either appropriate risk mitigation controls can be established with respect to such third-party or the Company can avoid engaging third parties deemed to present an unacceptable level of risk. Independent cybersecurity testing is performed by outside parties on at least an annual basis to identify opportunities for cyber control strengthening in the face of applicable threats. The results of these evaluations are reviewed and prioritized by the CIO and CISO based on their applicability and urgency to address gaps and drive continuous improvement. These findings, along with resultant enhancement and remediation efforts, are communicated with the Company’s Board of Directors.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The Information Security Office conducts company-wide cybersecurity training, including through an annually required course of online training modules and a continuous email phishing test campaign. In addition, the CISO leads periodic cybersecurity tabletop exercises with company leadership to continually improve the organization’s preparedness for cyber incidents.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Our Chief Information Officer (CIO) has more than 20 years of information technology and cybersecurity experience and our Chief Information Security Officer (CISO) has more than 15 years of direct cybersecurity experience.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The Audit Committee reviews the Internal Audit team’s cyber-related control audits to confirm that cyber risks are being appropriately managed and also reviews a periodic report produced by the CIO and CISO on the performance of the Company’s cybersecurity program. In addition, the CIO and CISO present a comprehensive cybersecurity update to the full Board of Directors on at least an annual basis.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Cybersecurity Risk Management and Strategy Disclosure

12 Months Ended

Dec. 31, 2025

Cybersecurity Risk Management, Strategy, and Governance [Line Items]

Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]

Risk Identification & Mitigation

Cyber risk is incorporated into the Company’s larger enterprise risk management practices, which include efforts to identify, assess, rank, treat, monitor and review risks. Cyber risks are assessed no less than annually by the CIO and CISO. Significant findings from these internal assessments are presented to management for incorporation into the enterprise risk management framework, and appropriate measures to mitigate and monitor the identified risks are developed and implemented. Strategic and emergent cyber-related efforts are shared with the wider information technology team and other stakeholders within the business for both informational and execution purposes.

The Company assesses and monitors third-party risks and closely tracks cyber threats such as ransomware and emergent web-based vulnerabilities. A variety of controls exist to minimize the impact of these risks and ensure each is managed within organizational tolerances, which controls are monitored by management for effectiveness. In addition, James River’s Information Security Office conducts cybersecurity risk reviews on new and existing third-party vendors and business partners, which are presented to management so that either appropriate risk mitigation controls can be established with respect to such third-party or the Company can avoid engaging third parties deemed to present an unacceptable level of risk.

Independent cybersecurity testing is performed by outside parties on at least an annual basis to identify opportunities for cyber control strengthening in the face of applicable threats. The results of these evaluations are reviewed and prioritized by the CIO and CISO based on their applicability and urgency to address gaps and drive continuous improvement. These findings, along with resultant enhancement and remediation efforts, are communicated with the Company’s Board of Directors.

Training

The Information Security Office conducts company-wide cybersecurity training, including through an annually required course of online training modules and a continuous email phishing test campaign. In addition, the CISO leads periodic cybersecurity tabletop exercises with company leadership to continually improve the organization’s preparedness for cyber incidents. These exercises consider real-world events that could impact the business and seek to fine-tune response activities in an effort to minimize future cybersecurity incident impacts.

See Item 1A. Risk Factors — General Risk Factors "We rely on our systems and employees, and those of certain third-party vendors and service providers in conducting our operations, and failures of these systems, controls or personnel could materially adversely affect our operations" for additional discussion.

Cybersecurity Risk Management Processes Integrated [Flag]

true

Cybersecurity Risk Management Processes Integrated [Text Block]

The Company utilizes widely-recognized frameworks based on practices believed to be effective for managing cybersecurity risk, including the development of an organizational understanding of systems, assets, data and capabilities, and the development and implementation of safeguards and processes designed to ensure delivery of services and to detect, respond to and recover from cybersecurity events. Significant time and resources are devoted to the protection of the Company’s systems and data, including the staffing of an experienced internal cybersecurity team, the use of a variety of preventative, detective and recovery tools, and engagement with external service providers to bolster the Company’s cyber defense and response capabilities.

Cybersecurity Risk Management Third Party Engaged [Flag]

true

Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]

true

Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]

false

Cybersecurity Risk Board of Directors Oversight [Text Block]

Board Oversight

The Company’s Board of Directors provides oversight of the Company’s cybersecurity risks through its Audit Committee. Four of the eight members of the Board of Directors, three of whom are Audit Committee members, possess skills related to information technology and cybersecurity. The Audit Committee reviews the Internal Audit team’s cyber-related control audits to confirm that cyber risks are being appropriately managed and also reviews a periodic report produced by the CIO and CISO on the performance of the Company’s cybersecurity program. In addition, the CIO and CISO present a comprehensive cybersecurity update to the full Board of Directors on at least an annual basis.

Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]

The Company’s Board of Directors provides oversight of the Company’s cybersecurity risks through its Audit Committee.

Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]

The Audit Committee reviews the Internal Audit team’s cyber-related control audits to confirm that cyber risks are being appropriately managed and also reviews a periodic report produced by the CIO and CISO on the performance of the Company’s cybersecurity program. In addition, the CIO and CISO present a comprehensive cybersecurity update to the full Board of Directors on at least an annual basis.

Cybersecurity Risk Role of Management [Text Block]

Cyber risks are assessed no less than annually by the CIO and CISO. Significant findings from these internal assessments are presented to management for incorporation into the enterprise risk management framework, and appropriate measures to mitigate and monitor the identified risks are developed and implemented. Strategic and emergent cyber-related efforts are shared with the wider information technology team and other stakeholders within the business for both informational and execution purposes.

Cybersecurity Risk Management Positions or Committees Responsible [Flag]

true

Cybersecurity Risk Management Positions or Committees Responsible [Text Block]

Cybersecurity Risk Management Expertise of Management Responsible [Text Block]

Our Chief Information Officer (CIO) has more than 20 years of information technology and cybersecurity experience and our Chief Information Security Officer (CISO) has more than 15 years of direct cybersecurity experience.

Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]

Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]

true