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Statutory Financial Information - Additional Details (Detail)
£ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fairwind Insurance Company              
Statutory Accounting Practices              
Statutory Accounting Practices, Permitted Practice, Amount $ 194.0   $ 137.0        
Unum Limited              
Statutory Accounting Practices              
Statutory Net Income | £   £ 36.8          
Statutory Combined Capital and Surplus | £   £ 584.1          
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments | £         £ 180.0    
Traditional U.S. Life Insurance Subsidiaries              
Statutory Accounting Practices              
Statutory Net Income $ 982.1   $ 953.0 $ 807.4      
Statutory Combined Capital and Surplus           $ 3,644.4 $ 3,572.7
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments           1,035.0  
Cash and Securities Segregated under Federal and Other Regulations           $ 135.2 $ 155.7