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Statutory Financial Information - Additional Details (Detail) £ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 GBP (£) | Dec. 31, 2023 USD ($) | Dec. 31, 2025 GBP (£) | Dec. 31, 2024 GBP (£)
Fairwind Insurance Company |  |  |  |  |  |
Statutory Accounting Practices |  |  |  |  |  |
Statutory Accounting Practices, Statutory to NAIC, Permitted, Difference, Amount | $ 185.0 | $ 334.0 |  |  |  |
Unum Limited |  |  |  |  |  |
Statutory Accounting Practices |  |  |  |  |  |
Statutory Net Income | £ |  |  | £ 106.7 |  |  |
Statutory Combined Capital and Surplus | £ |  |  |  |  |  | £ 749.8
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments | £ |  |  |  |  | £ 125.0 |
Traditional U.S. Life Insurance Subsidiaries |  |  |  |  |  |
Statutory Accounting Practices |  |  |  |  |  |
Statutory Net Income | 634.0 | 1,322.4 |  | $ 1,329.9 |  |
Statutory Combined Capital and Surplus | 3,770.6 | 3,909.7 |  |  |  |
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments | 631.0 |  |  |  |  |
Cash and Securities Segregated under Federal and Other Regulations | $ 123.4 | $ 119.3 |  |  |  |

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