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Policyholder Account Balance (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Policyholder Account Balance [Roll Forward]      
Policyholders' Account Balance $ 5,659.9   $ 5,633.7
Operating Segments      
Policyholder Account Balance [Roll Forward]      
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year 5,470.0 $ 5,514.2  
Policyholder Account Balance, Premium Received 117.8 124.2  
Policyholder Account Balance, Policy Charge (175.7) [1] (170.8) [2]  
Policyholder Account Balance, Surrender and Withdrawal (70.7) (64.5)  
Policyholder Account Balance, Benefit Payment (147.1) (167.9)  
Policyholder Account Balance, Interest Expense 287.9 261.4  
Policyholder Account Balance, Increase (Decrease) from Other Change 8.0 8.6  
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period 5,490.2 5,505.2  
Policyholder Account Balance, Reserves in excess of Account Balance 169.7 156.1  
Policyholders' Account Balance 5,659.9 5,661.3  
Policyholder Account Balance, Reinsurance recoverable 4,135.9 4,124.3  
Policyholder Account Balance, After reinsurance recoverable $ 1,524.0 $ 1,537.0  
Policyholder Account Balance, Weighted Average Crediting Rate 7.30% 6.50%  
Policyholder Account Balance, Net Amount at Risk $ 13,228.0 [3] $ 14,234.1 [4]  
Policyholder Account Balance, Cash Surrender Value 5,421.7 5,440.2  
Unum US | Voluntary Benefits      
Policyholder Account Balance [Roll Forward]      
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year 568.8 578.6  
Policyholder Account Balance, Premium Received 37.3 40.7  
Policyholder Account Balance, Policy Charge (41.0) [1] (42.9) [2]  
Policyholder Account Balance, Surrender and Withdrawal (30.0) (24.3)  
Policyholder Account Balance, Benefit Payment (4.6) (4.8)  
Policyholder Account Balance, Interest Expense 15.1 15.7  
Policyholder Account Balance, Increase (Decrease) from Other Change 7.2 7.6  
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period 552.8 570.6  
Policyholder Account Balance, Reserves in excess of Account Balance 114.6 104.4  
Policyholders' Account Balance 667.4 675.0  
Policyholder Account Balance, Reinsurance recoverable 0.7 0.8  
Policyholder Account Balance, After reinsurance recoverable $ 666.7 $ 674.2  
Policyholder Account Balance, Weighted Average Crediting Rate 3.60% 3.70%  
Policyholder Account Balance, Net Amount at Risk $ 3,822.1 [3] $ 4,210.4 [4]  
Policyholder Account Balance, Cash Surrender Value 542.5 560.4  
Colonial Life      
Policyholder Account Balance [Roll Forward]      
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year 849.0 852.9  
Policyholder Account Balance, Premium Received 56.3 60.2  
Policyholder Account Balance, Policy Charge (52.2) [1] (54.2) [2]  
Policyholder Account Balance, Surrender and Withdrawal (28.3) (30.4)  
Policyholder Account Balance, Benefit Payment (5.9) (6.0)  
Policyholder Account Balance, Interest Expense 25.4 25.6  
Policyholder Account Balance, Increase (Decrease) from Other Change 0.1 0.2  
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period 844.4 848.3  
Policyholder Account Balance, Reserves in excess of Account Balance 12.9 14.5  
Policyholders' Account Balance 857.3 862.8  
Policyholder Account Balance, Reinsurance recoverable 0.0 0.0  
Policyholder Account Balance, After reinsurance recoverable $ 857.3 $ 862.8  
Policyholder Account Balance, Weighted Average Crediting Rate 4.10% 4.10%  
Policyholder Account Balance, Net Amount at Risk $ 7,795.1 [3] $ 8,325.0 [4]  
Policyholder Account Balance, Cash Surrender Value 821.9 817.1  
Closed Block | Other Insurance Product Line      
Policyholder Account Balance [Roll Forward]      
Policyholder Account Balance, before Reserves in excess of Account Balance, Beginning of Year 4,052.2 4,082.7  
Policyholder Account Balance, Premium Received 24.2 23.3  
Policyholder Account Balance, Policy Charge (82.5) [1] (73.7) [2]  
Policyholder Account Balance, Surrender and Withdrawal (12.4) (9.8)  
Policyholder Account Balance, Benefit Payment (136.6) (157.1)  
Policyholder Account Balance, Interest Expense 247.4 220.1  
Policyholder Account Balance, Increase (Decrease) from Other Change 0.7 0.8  
Policyholder Account Balance, before Reserves in excess of Account Balance, End of Period 4,093.0 4,086.3  
Policyholder Account Balance, Reserves in excess of Account Balance 42.2 37.2  
Policyholders' Account Balance 4,135.2 4,123.5  
Policyholder Account Balance, Reinsurance recoverable 4,135.2 4,123.5  
Policyholder Account Balance, After reinsurance recoverable $ 0.0 $ 0.0  
Policyholder Account Balance, Weighted Average Crediting Rate 8.50% 7.40%  
Policyholder Account Balance, Net Amount at Risk $ 1,610.8 [3] $ 1,698.7 [4]  
Policyholder Account Balance, Cash Surrender Value $ 4,057.3 $ 4,062.7  
[1]
1Contracts included in the policyholders' account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
[2]
1Contracts included in the policyholders' account balances are generally charged a premium and/or monthly assessments on the basis of the account balance.
[3]
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.
[4]
2For those guarantees of benefits that are payable in the event of death, the net amount at risk is generally defined as the current guaranteed minimum death benefit in excess of the current account balance at the balance sheet date.