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Segment Information Segments - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Integer
Rate
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Rate
Segment Reporting [Abstract]      
Number of Operating Segments | Integer 3    
Supplementary Insurance Information, by Segment      
Percentage Ownership of Acquired Business | Rate     100.00%
Name of Acquired Businesses     H&J Capital, L.L.C., parent of Starmount Life Insurance Company and AlwaysCare Benefits (Starmount)
Assets of Acquiree at Acquisition Date     $ 93.1
Total Cash Purchase Price to Acquire Business     140.3
Liabilities of Acquiree at Acquisition Date     55.7
Business Combination, Contingent Consideration, Liability, Noncurrent     10.0
Goodwill $ 350.3 $ 338.6  
Payable due 18 Months After Acquisition      
Supplementary Insurance Information, by Segment      
Business Combination, Contingent Consideration, Liability, Noncurrent     5.0
Payable due 24 Months After Acquisition      
Supplementary Insurance Information, by Segment      
Business Combination, Contingent Consideration, Liability, Noncurrent     5.0
Unum US and Colonial      
Supplementary Insurance Information, by Segment      
Goodwill     $ 111.2
Unum US      
Supplementary Insurance Information, by Segment      
Percent of Goodwill Allocated to a Business Segment | Rate     75.00%
Goodwill 280.0 271.1  
Unum International      
Supplementary Insurance Information, by Segment      
Goodwill 42.6 39.8  
Colonial Life      
Supplementary Insurance Information, by Segment      
Percent of Goodwill Allocated to a Business Segment | Rate     25.00%
Goodwill $ 27.7 27.7  
Jaimini Health, Inc.      
Supplementary Insurance Information, by Segment      
Percentage Ownership of Acquired Business | Rate 100.00%    
Name of Acquired Businesses Jaimini Health, Inc. (Jaimini Health)    
Unum Poland      
Supplementary Insurance Information, by Segment      
Percentage Ownership of Acquired Business | Rate 100.00%    
Name of Acquired Businesses Unum Poland    
Leavelogic Inc.      
Supplementary Insurance Information, by Segment      
Percentage Ownership of Acquired Business | Rate 100.00%    
Name of Acquired Businesses Leavelogic, Inc (Leavelogic)    
Series of Individually Immaterial Business Acquisitions      
Supplementary Insurance Information, by Segment      
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period   $ 61.0  
Assets of Acquiree at Acquisition Date $ 344.0    
Total Cash Purchase Price to Acquire Business 151.0    
Liabilities of Acquiree at Acquisition Date 206.0    
Goodwill $ 13.0