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Statutory Financial Information - Additional Details (Detail)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
GBP (£)
Dec. 31, 2019
GBP (£)
Unum Life Insurance Company of America            
Statutory Accounting Practices            
Statutory Accounting Practices, Permitted Practice, Reserve Deficiency       $ 2,100.0    
Statutory Accounting Practices, Permitted Practice, Amount $ 229.0          
Fairwind Insurance Company            
Statutory Accounting Practices            
Statutory Accounting Practices, Permitted Practice, Amount 287.0 $ 194.0        
Unum Limited            
Statutory Accounting Practices            
Statutory Net Income | £     £ 91.0      
Statutory Combined Capital and Surplus | £           £ 656.1
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments | £         £ 170.0  
Traditional U.S. Life Insurance Subsidiaries            
Statutory Accounting Practices            
Statutory Net Income 646.8 982.1   $ 953.0    
Statutory Combined Capital and Surplus 3,875.0 3,644.4        
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments 974.0          
Cash and Securities Segregated under Federal and Other Regulations $ 135.5 $ 135.2