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Statutory Financial Information - Additional Details (Detail)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
GBP (£)
Unum Life Insurance Company of America            
Statutory Accounting Practices            
Statutory Accounting Practices, Permitted Practice, Amount $ 524.0 $ 438.0   $ 229.0    
Fairwind Insurance Company            
Statutory Accounting Practices            
Statutory Accounting Practices, Permitted Practice, Amount 351.0 360.0        
Unum Limited            
Statutory Accounting Practices            
Statutory Net Income | £     £ 121.8      
Statutory Combined Capital and Surplus | £           £ 631.0
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments | £         £ 80.0  
Traditional U.S. Life Insurance Subsidiaries            
Statutory Accounting Practices            
Statutory Net Income 965.4 779.5   $ 646.8    
Statutory Combined Capital and Surplus 3,816.3 3,950.3        
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments 991.0          
Cash and Securities Segregated under Federal and Other Regulations $ 118.8 $ 117.7