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Statutory Financial Information - Additional Details (Detail)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
GBP (£)
Dec. 31, 2022
GBP (£)
Unum Life Insurance Company of America            
Statutory Accounting Practices            
Statutory Accounting Practices, Permitted Practice, Amount $ 413.0 $ 524.0   $ 438.0    
Fairwind Insurance Company            
Statutory Accounting Practices            
Statutory Accounting Practices, Permitted Practice, Amount 469.0 351.0        
Unum Limited            
Statutory Accounting Practices            
Statutory Net Income | £     £ 569.2      
Statutory Combined Capital and Surplus | £           £ 622.7
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments | £         £ 140.0  
Traditional U.S. Life Insurance Subsidiaries            
Statutory Accounting Practices            
Statutory Net Income 1,329.9 965.4   $ 779.5    
Statutory Combined Capital and Surplus 3,751.3 3,816.3        
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments 1,289.0          
Cash and Securities Segregated under Federal and Other Regulations $ 119.1 $ 118.8