Summary of Significant Accounting Policies (Policies) |
9 Months Ended |
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Sep. 30, 2026 | |
| Accounting Policies [Abstract] | |
| Basis of Presentation | Basis of presentation The unaudited condensed consolidated financial statements and notes have been prepared in accordance with U.S. generally accepted accounting principles ("U.S. GAAP") for interim financial information and do not contain all of the information and footnotes required by U.S. GAAP for complete financial statements. As such, these unaudited condensed consolidated interim financial statements should be read in conjunction with the audited consolidated financial statements of Kinsale Capital Group, Inc. and its subsidiaries ("the Company") included in the Annual Report on Form 10-K for the year ended December 31, 2025. In the opinion of management, all adjustments necessary for a fair presentation of the condensed consolidated financial statements have been included. Such adjustments consist only of normal recurring items. All significant intercompany balances and transactions have been eliminated in consolidation. Interim results are not necessarily indicative of results of operations for the full year.
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| Use of Estimates | Use of estimates The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, if any, at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
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| New Accounting Pronouncements, Policy | Prospective accounting pronouncements Accounting Standards Update ("ASU") 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures In November 2024, the FASB issued ASU 2024-03, "Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses," requiring public entities to disclose additional information about specific expense categories in the notes to the financial statements on an interim and annual basis. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and for interim periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the effect the guidance will have on its disclosures. ASU 2025-06, Intangibles – Goodwill and Other – Internal-Use Software In September 2025, the FASB issued ASU 2025-06, "Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40) Targeted Improvements to the Accounting for Internal-Use Software," to modernize the accounting for software costs that are accounted for under Subtopic 350-40, Intangibles – Goodwill and Other – Internal-Use Software. ASU 2025-06 is effective for fiscal years beginning after December 15, 2027, and for interim periods beginning after December 15, 2027, with early adoption permitted. The Company is currently evaluating the effect the guidance will have on its financial statements.
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