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Statutory Financial Information - Additional Details (Detail)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Dec. 31, 2019
USD ($)
Dec. 31, 2021
GBP (£)
Dec. 31, 2020
GBP (£)
Unum Life Insurance Company of America            
Statutory Accounting Practices            
Statutory Accounting Practices, Permitted Practice, Amount $ 438.0 $ 229.0        
Statutory Accounting Practices, Permitted Practice, Reserve Deficiency 2,300.0 2,100.0        
Fairwind Insurance Company            
Statutory Accounting Practices            
Statutory Accounting Practices, Permitted Practice, Amount 360.0 287.0        
Unum Limited            
Statutory Accounting Practices            
Statutory Net Income | £     £ (28.1)      
Statutory Combined Capital and Surplus | £           £ 608.3
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments | £         £ 130.0  
Traditional U.S. Life Insurance Subsidiaries            
Statutory Accounting Practices            
Statutory Net Income 779.5 646.8   $ 982.1    
Statutory Combined Capital and Surplus 3,950.3 3,875.0        
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments 861.0          
Cash and Securities Segregated under Federal and Other Regulations $ 117.7 $ 135.5