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Parent Company Notes - Additional Details (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 1998
Dec. 31, 2018
Repayments of Principal in 2023 $ 2.0        
Repayments of Principal in 2024 350.0        
Repayments of Principal in 2025 275.0        
Repayments of Principal Thereafter 2,847.5        
Derivative, Notional Amount 970.5 $ 744.4 $ 881.4   $ 799.2
Notional Amount Of Derivatives Terminations $ 1,314.3 257.3 471.5    
Unum Group Percentage Ownership of Provident Financing Trust 100.00%        
Cost Related to Early Retirement of Debt $ 67.3 0.0 27.3    
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 181.6 178.1 172.9    
Parent Company          
Repayments of Principal in 2023 2.0        
Repayments of Principal in 2024 350.0        
Repayments of Principal in 2025 275.0        
Repayments of Principal Thereafter $ 2,847.5        
Unum Group Percentage Ownership of Provident Financing Trust 100.00%        
Cost Related to Early Retirement of Debt $ 67.3 0.0 27.3    
Interest Paid, Including Capitalized Interest, Operating and Investing Activities 181.6 $ 176.6 168.4    
Parent Company | Facility agreement for contingent issuance of senior notes          
Line of Credit Facility, Maximum Borrowing Capacity $ 400.0        
Line of Credit Facility, Commitment Fee Percentage 2.225%        
Debt Instrument, Covenant Description 2.0 billion        
Parent Company | Five-year Unsecured Revolving Credit Facility          
Line of Credit Facility, Maximum Borrowing Capacity $ 500.0        
Letters of Credit Outstanding 0.0        
Parent Company | Three-year Unsecured Revolving Credit Facility          
Letters of Credit Outstanding $ 0.0        
Notes Issued in 2010 | Senior Notes          
Stated Interest Rate of Debt   5.625%      
Notes Issued in 2020 due 2025 | Senior Notes          
Stated Interest Rate of Debt   4.50%      
Medium Term Notes Payable Due 2028          
Costs Related to Early Retirement of Debt     27.3    
Medium Term Notes Payable Due 2028 | Medium-term Notes          
Extinguishment of Debt, Amount     $ 30.3    
Stated Interest Rate of Debt     7.19%    
Notes Issued in 1998 with 2028 Maturity Date          
Costs Related to Early Retirement of Debt     $ 27.3    
Notes Issued in 1998 with 2028 Maturity Date | Senior Notes          
Extinguishment of Debt, Amount     $ 30.0    
Stated Interest Rate of Debt     7.25%    
Senior Notes Payable due 2021          
Costs Related to Early Retirement of Debt     $ 27.3    
Senior Notes Payable due 2021 | Senior Notes          
Extinguishment of Debt, Amount     $ 350.0    
Stated Interest Rate of Debt     3.00%    
Notes Issued in 2019 due 2049 | Senior Notes          
Proceeds from Issuance of Debt     $ 450.0    
Stated Interest Rate of Debt     4.50%    
Notes Issued in 2019 | Senior Notes          
Proceeds from Issuance of Debt     $ 400.0    
Stated Interest Rate of Debt     4.00%    
Notes Issued in 1998 with 2038 Maturity Date | Junior Subordinated Debt          
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          
Proceeds from Issuance of Debt       $ 300.0  
Stated Interest Rate of Debt 7.405%   7.405%    
Liquidation value per capital security $ 1,000        
Junior Subordinated Notes Payable Due 2038 | Junior Subordinated Debt          
Extinguishment of Debt, Amount     $ 22.8    
Stated Interest Rate of Debt     7.405%    
Junior Subordinated Notes Payable Due 2038 | Parent Company | Junior Subordinated Debt          
Extinguishment of Debt, Amount     $ 22.8    
Stated Interest Rate of Debt     7.405%    
Capital Securities Notes Payable Due 2038          
Extinguishment of Debt, Amount     $ 22.8    
Stated Interest Rate of Debt     7.405%    
Capital Securities Notes Payable Due 2038 | Parent Company          
Extinguishment of Debt, Amount     $ 22.8    
4.125% Senior Notes due 2051 | Senior Notes          
Proceeds from Issuance of Debt $ 600.0        
Stated Interest Rate of Debt 4.125%        
4.500% Senior Notes due 2025          
Costs Related to Early Retirement of Debt $ 67.3        
4.500% Senior Notes due 2025 | Senior Notes          
Proceeds from Issuance of Debt   $ 500.0      
Notes 5.625 Due 2020          
Debt Instrument, Repurchased Face Amount   400.0      
Receive Fixed/Pay Variable | Interest Rate Swaps          
Derivative, Notional Amount 0.0 0.0 250.0   $ 250.0
Notional Amount Of Derivatives Terminations $ 0.0 $ 250.0 0.0    
Receive Fixed/Pay Variable | Interest Rate Swaps | Parent Company          
Derivative, Notional Amount     $ 250.0