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Parent Company Notes - Additional Details (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 1998
Dec. 31, 2016
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          
Line of Credit Facility, Maximum Borrowing Capacity 500.0        
Letters of Credit Outstanding 0.0        
Three-year Unsecured Revolving Credit Facility          
Line of Credit Facility, Maximum Borrowing Capacity 100.0        
Letters of Credit Outstanding 0.0        
Parent Company          
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          
Line of Credit Facility, Maximum Borrowing Capacity 500.0        
Letters of Credit Outstanding 0.6        
Parent Company | Three-year Unsecured Revolving Credit Facility          
Line of Credit Facility, Maximum Borrowing Capacity 100.0        
Letters of Credit Outstanding $ 0.0        
Notes Issued in 1998 with 2018 Maturity Date | Parent Company          
Short-term debt   $ 200.0      
Stated Interest Rate of Debt   7.00%      
Notes Issued in 2018 with a 2058 Maturity Date | Junior Subordinated Debt          
Proceeds from Issuance of Debt   $ 300.0      
Stated Interest Rate of Debt   6.25%      
Notes Issued in 2018 with a 2058 Maturity Date | Junior Subordinated Debt | Parent Company          
Proceeds from Issuance of Debt   $ 300.0      
Stated Interest Rate of Debt   6.25%      
Notes Issued in 1998 with 2038 Maturity Date | Junior Subordinated Debt          
Stated Interest Rate of Debt 7.405%        
Proceeds from Issuance of Senior Long-term Debt       $ 300.0  
Liquidation value per capital security $ 1,000        
Notes Issued in 1998 with 2038 Maturity Date | Junior Subordinated Debt | Parent Company          
Stated Interest Rate of Debt 7.405%        
Proceeds from Issuance of Senior Long-term Debt       $ 300.0  
Liquidation value per capital security $ 1,000        
Medium Term Notes Payable Due 2028 | Medium-term Notes          
Extinguishment of Debt, Amount $ 30.3        
Stated Interest Rate of Debt 7.19%        
Medium Term Notes Payable Due 2028 | Parent Company | Medium-term Notes          
Extinguishment of Debt, Amount $ 30.3        
Stated Interest Rate of Debt 7.19%        
Notes Issued in 1998 with 2028 Maturity Date | Senior Notes          
Extinguishment of Debt, Amount $ 30.0        
Stated Interest Rate of Debt 7.25%        
Notes Issued in 1998 with 2028 Maturity Date | Parent Company | Senior Notes          
Extinguishment of Debt, Amount $ 30.0        
Stated Interest Rate of Debt 7.25%        
Senior Notes Payable due 2021 | Senior Notes          
Extinguishment of Debt, Amount $ 350.0        
Stated Interest Rate of Debt 3.00%        
Senior Notes Payable due 2021 | Parent Company | 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 due 2049 | Senior Notes | Parent Company          
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 2019 | Senior Notes | Parent Company          
Proceeds from Issuance of Debt $ 400.0        
Stated Interest Rate of Debt 4.00%        
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        
Receive Fixed/Pay Variable | Interest Rate Swaps          
Derivative, Notional Amount 250.0 $ 250.0 $ 250.0   $ 250.0
Receive Fixed/Pay Variable | Interest Rate Swaps | Parent Company          
Derivative, Notional Amount $ 250.0 $ 250.0