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Debt - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2007
Dec. 31, 1998
Dec. 31, 2016
Debt Additional Information            
Repayments of Principal in 2020 $ 400.0          
Repayments of Principal in 2023 2.0          
Repayments of Principal Thereafter 2,602.5          
Short-term debt 399.7 $ 0.0        
Derivative, Notional Amount $ 881.4 799.2 $ 904.5     $ 1,052.0
Unum Group Percentage Ownership of Provident Financing Trust 100.00%          
Cost Related to Early Retirement of Debt $ 27.3 0.0 0.0      
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 172.9 167.3 154.4      
Five-year Unsecured Revolving Credit Facility            
Debt Additional Information            
Line of Credit Facility, Maximum Borrowing Capacity 500.0          
Letters of Credit Outstanding 0.0          
Three-year Unsecured Revolving Credit Facility            
Debt Additional Information            
Line of Credit Facility, Maximum Borrowing Capacity 100.0          
Letters of Credit Outstanding 0.0          
Parent Company            
Debt Additional Information            
Repayments of Principal in 2020 400.0          
Repayments of Principal in 2023 2.0          
Repayments of Principal in 2024 350.0          
Repayments of Principal Thereafter 2,522.5          
Short-term debt $ 399.7 0.0        
Unum Group Percentage Ownership of Provident Financing Trust 100.00%          
Cost Related to Early Retirement of Debt $ 27.3 0.0 0.0      
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 168.4 $ 161.4 148.7      
Parent Company | Five-year Unsecured Revolving Credit Facility            
Debt Additional Information            
Line of Credit Facility, Maximum Borrowing Capacity 500.0          
Letters of Credit Outstanding 0.6          
Parent Company | Three-year Unsecured Revolving Credit Facility            
Debt Additional Information            
Line of Credit Facility, Maximum Borrowing Capacity 100.0          
Letters of Credit Outstanding $ 0.0          
Notes Issued in 2019 due 2049 | Senior Notes            
Debt Additional Information            
Stated Interest Rate of Debt 4.50%          
Proceeds from Issuance of Debt $ 450.0          
Notes Issued in 2019 due 2049 | Senior Notes | Parent Company            
Debt Additional Information            
Stated Interest Rate of Debt 4.50%          
Proceeds from Issuance of Debt $ 450.0          
Notes Issued in 2019 | Senior Notes            
Debt Additional Information            
Stated Interest Rate of Debt 4.00%          
Proceeds from Issuance of Debt $ 400.0          
Notes Issued in 2019 | Senior Notes | Parent Company            
Debt Additional Information            
Stated Interest Rate of Debt 4.00%          
Proceeds from Issuance of Debt $ 400.0          
Notes Issued in 1998 with 2018 Maturity Date | Parent Company            
Debt Additional Information            
Stated Interest Rate of Debt   7.00%        
Short-term debt   $ 200.0        
Notes Issued in 2018 with a 2058 Maturity Date | Junior Subordinated Debt            
Debt Additional Information            
Stated Interest Rate of Debt   6.25%        
Proceeds from Issuance of Debt   $ 300.0        
Notes Issued in 2018 with a 2058 Maturity Date | Junior Subordinated Debt | Parent Company            
Debt Additional Information            
Stated Interest Rate of Debt   6.25%        
Proceeds from Issuance of Debt   $ 300.0        
Notes Issued in 1998 with 2038 Maturity Date | Junior Subordinated Debt            
Debt Additional Information            
Proceeds from Issuance of Senior Long-term Debt         $ 300.0  
Stated Interest Rate of Debt 7.405%          
Liquidation value per capital security $ 1,000          
Notes Issued in 1998 with 2038 Maturity Date | Junior Subordinated Debt | Parent Company            
Debt Additional Information            
Proceeds from Issuance of Senior Long-term Debt         $ 300.0  
Stated Interest Rate of Debt 7.405%          
Liquidation value per capital security $ 1,000          
Capital Securities Notes Payable Due 2038            
Debt Additional Information            
Extinguishment of Debt, Amount $ 22.8          
Stated Interest Rate of Debt 7.405%          
Capital Securities Notes Payable Due 2038 | Parent Company            
Debt Additional Information            
Extinguishment of Debt, Amount $ 22.8          
Long-term Debt | Secured Notes acquired 2016            
Debt Additional Information            
Extinguishment of Debt, Amount     3.4      
Medium-term Notes | Medium Term Notes Payable Due 2028            
Debt Additional Information            
Extinguishment of Debt, Amount $ 30.3          
Stated Interest Rate of Debt 7.19%          
Medium-term Notes | Medium Term Notes Payable Due 2028 | Parent Company            
Debt Additional Information            
Extinguishment of Debt, Amount $ 30.3          
Stated Interest Rate of Debt 7.19%          
Senior Notes | Notes Issued in 1998 with 2028 Maturity Date            
Debt Additional Information            
Extinguishment of Debt, Amount $ 30.0          
Stated Interest Rate of Debt 7.25%          
Senior Notes | Notes Issued in 1998 with 2028 Maturity Date | Parent Company            
Debt Additional Information            
Extinguishment of Debt, Amount $ 30.0          
Stated Interest Rate of Debt 7.25%          
Senior Notes | Senior Notes Payable due 2021            
Debt Additional Information            
Extinguishment of Debt, Amount $ 350.0          
Stated Interest Rate of Debt 3.00%          
Senior Notes | Senior Notes Payable due 2021 | Parent Company            
Debt Additional Information            
Extinguishment of Debt, Amount $ 350.0          
Stated Interest Rate of Debt 3.00%          
Junior Subordinated Debt | Junior Subordinated Notes Payable Due 2038            
Debt Additional Information            
Extinguishment of Debt, Amount $ 22.8          
Stated Interest Rate of Debt 7.405%          
Junior Subordinated Debt | Junior Subordinated Notes Payable Due 2038 | Parent Company            
Debt Additional Information            
Extinguishment of Debt, Amount $ 22.8          
Stated Interest Rate of Debt 7.405%          
Receive Variable/Pay Fixed | Interest Rate Swaps            
Debt Additional Information            
Loss on Contract Termination     0.1      
Derivative, Notional Amount $ 0.0 0.0 48.0     105.5
Receive Fixed/Pay Variable | Interest Rate Swaps            
Debt Additional Information            
Derivative, Notional Amount 250.0 250.0 250.0     $ 250.0
Receive Fixed/Pay Variable | Interest Rate Swaps | Parent Company            
Debt Additional Information            
Derivative, Notional Amount 250.0 250.0        
Northwind Holdings LLC            
Debt Additional Information            
Proceeds from Issuance of Senior Long-term Debt       $ 800.0    
Basis Spread on LIBOR       0.78%    
Debt service coverage account (DSCA) 64.3          
Periodic Principal Payments $ 60.0 $ 60.0 $ 60.0