v3.26.1
Liability for Future Policy Benefit Activity (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Future Policy Benefits $ 37,610.7   $ 38,017.0  
Operating Segments        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year 14,416.5 $ 13,930.6    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 14,393.0 14,266.9    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0.0 $ 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (285.7) (191.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     14,107.3 14,075.4
Liability for Future Policy Benefit, Expected Net Premium, Issuance 747.2 697.7    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 321.5 323.1    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (891.0) (852.7)    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change (17.7) 47.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 14,267.3 14,290.5    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (165.9) (125.3)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 14,101.4 14,165.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 50,683.1 48,920.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 51,638.5 50,778.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (209.5) (267.2)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     $ 51,429.0 $ 50,511.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [1] 2,040.0 1,951.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 1,157.0 1,136.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (2,980.6) (2,915.4)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change (67.4) 284.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 51,578.0 50,968.5    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (1,547.0) (1,382.5)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 50,031.0 49,586.0    
Liability for Future Policy Benefit, before Reinsurance, before Other 35,929.6 35,420.8    
Liability for Future Policy Benefit, Other [2] 1,497.8 1,558.5    
Liability for Future Policy Benefit, before Reinsurance, after Other 37,427.4 36,979.3    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 9,896.9 6,791.9    
Liability for Future Policy Benefit, after Reinsurance 27,530.5 30,187.4    
Liability for Future Policy Benefit, Gross Premium Income 5,516.6 5,233.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 835.5 813.7    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 101,513.9 102,952.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 39,698.9 39,814.8    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 26,351.3 $ 26,214.6    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.00% 4.90%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.30% 5.20% 5.10% 5.30%
Liability for Future Policy Benefit, Weighted-Average Duration 11 years 11 years 3 months 18 days    
Future Policy Benefits $ 37,610.7 $ 37,182.9    
Unum US        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year 2,622.0 2,442.7    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 2,679.8 2,566.0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     $ 0.0 $ 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (45.0) (101.2)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     2,634.8 2,464.8
Liability for Future Policy Benefit, Expected Net Premium, Issuance 417.5 405.5    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 52.4 49.8    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (225.0) (204.2)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 2,879.7 2,715.9    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (86.9) (80.9)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 2,792.8 2,635.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 11,067.3 11,030.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 11,365.9 11,565.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (106.2) (195.6)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     11,259.7 11,370.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 1,407.1 1,394.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 211.2 216.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (1,372.0) (1,369.3)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 11,506.0 11,611.2    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (416.4) (395.5)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 11,089.6 11,215.7    
Liability for Future Policy Benefit, before Reinsurance, before Other 8,296.8 8,580.7    
Liability for Future Policy Benefit, Other 32.1 30.9    
Liability for Future Policy Benefit, before Reinsurance, after Other 8,328.9 8,611.6    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 418.1 115.9    
Liability for Future Policy Benefit, after Reinsurance 7,910.8 8,495.7    
Liability for Future Policy Benefit, Gross Premium Income 3,589.3 3,403.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 158.8 166.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 17,718.4 17,777.4    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 12,746.8 12,149.6    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 8,586.0 $ 8,275.0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.40% 4.40%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.80% 4.60%    
Liability for Future Policy Benefit, Weighted-Average Duration 7 years 7 years 1 month 6 days    
Future Policy Benefits [3] $ 8,328.9 $ 8,611.6    
Unum International        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year 352.8 276.1    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 378.0 314.2    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (0.9) 2.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     377.1 316.3
Liability for Future Policy Benefit, Expected Net Premium, Issuance 20.0 17.7    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 7.2 6.5    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (17.9) (16.1)    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change (17.7) 47.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 368.7 371.4    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (24.8) (34.2)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 343.9 337.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 2,699.0 2,391.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 2,923.4 2,641.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     3.9 1.8
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     2,927.3 2,643.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [4] 259.5 212.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 39.8 36.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (260.5) (243.4)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change (67.4) 284.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 2,898.7 2,933.2    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (253.3) (243.6)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 2,645.4 2,689.6    
Liability for Future Policy Benefit, before Reinsurance, before Other 2,301.5 2,352.4    
Liability for Future Policy Benefit, Other 49.3 50.1    
Liability for Future Policy Benefit, before Reinsurance, after Other 2,350.8 2,402.5    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 85.9 73.1    
Liability for Future Policy Benefit, after Reinsurance 2,264.9 2,329.4    
Liability for Future Policy Benefit, Gross Premium Income 584.4 506.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 32.6 29.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 4,686.3 4,760.1    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 1,641.3 1,562.1    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 1,013.8 $ 982.5    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.10% 4.10%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.10% 4.90%    
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 8 months 12 days 8 years 10 months 24 days    
Future Policy Benefits $ 2,350.8 $ 2,402.5    
Colonial Life        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year 3,709.0 3,553.3    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 3,850.9 3,793.8    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (22.8) 5.9
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     3,828.1 3,799.7
Liability for Future Policy Benefit, Expected Net Premium, Issuance 309.7 274.5    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 73.0 72.1    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (326.5) (319.5)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 3,884.3 3,826.8    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (176.4) (180.1)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 3,707.9 3,646.7    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 5,710.4 5,434.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 6,179.4 6,026.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (43.2) (5.5)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     6,136.2 6,020.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 331.2 295.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 122.6 119.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (331.1) (327.5)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 6,258.9 6,108.4    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (519.7) (516.6)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 5,739.2 5,591.8    
Liability for Future Policy Benefit, before Reinsurance, before Other 2,031.3 1,945.1    
Liability for Future Policy Benefit, Other 29.6 23.8    
Liability for Future Policy Benefit, before Reinsurance, after Other 2,060.9 1,968.9    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 1.4 1.1    
Liability for Future Policy Benefit, after Reinsurance 2,059.5 1,967.8    
Liability for Future Policy Benefit, Gross Premium Income 919.5 888.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 49.6 47.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 11,363.5 10,685.1    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 13,462.5 12,887.4    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 9,456.5 $ 9,187.4    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.40% 4.40%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.40% 5.30%    
Liability for Future Policy Benefit, Weighted-Average Duration 17 years 6 months 17 years 2 months 12 days    
Future Policy Benefits $ 2,060.9 $ 1,968.9    
Closed Block        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year 7,732.7 7,658.5    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 7,484.3 7,592.9    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (217.0) (98.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     7,267.3 7,494.6
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 188.9 194.7    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (321.6) (312.9)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 7,134.6 7,376.4    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 122.2 169.9    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 7,256.8 7,546.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 31,206.4 30,063.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 31,169.8 30,544.7    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (64.0) (67.9)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     31,105.8 30,476.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 42.2 49.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 783.4 764.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (1,017.0) (975.2)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 30,914.4 30,315.7    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (357.6) (226.8)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 30,556.8 30,088.9    
Liability for Future Policy Benefit, before Reinsurance, before Other 23,300.0 22,542.6    
Liability for Future Policy Benefit, Other 1,386.8 1,453.7    
Liability for Future Policy Benefit, before Reinsurance, after Other 24,686.8 23,996.3    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 9,391.5 6,601.8    
Liability for Future Policy Benefit, after Reinsurance 15,295.3 17,394.5    
Liability for Future Policy Benefit, Gross Premium Income 423.4 435.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 594.5 570.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 67,745.7 69,729.4    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 11,848.3 13,215.7    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 7,295.0 $ 7,769.7    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.30% 5.30%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.50% 5.50%    
Liability for Future Policy Benefit, Weighted-Average Duration 12 years 1 month 6 days 12 years 8 months 12 days    
Future Policy Benefits [3] $ 24,686.8 $ 23,996.3    
Other Products [Member]        
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Future Policy Benefits [3] 183.3 203.6    
Group Disability | Unum US        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 0.0 0.0    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 4,588.1 4,735.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 4,656.9 4,907.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (29.4) (63.7)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     4,627.5 4,843.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 710.1 [5] 697.5 [6]    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 72.1 78.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (792.5) (783.8)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 4,617.2 4,836.4    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (114.8) (112.0)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 4,502.4 4,724.4    
Liability for Future Policy Benefit, before Reinsurance, before Other 4,502.4 4,724.4    
Liability for Future Policy Benefit, Other 0.1 0.2    
Liability for Future Policy Benefit, before Reinsurance, after Other 4,502.5 4,724.6    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 23.3 25.3    
Liability for Future Policy Benefit, after Reinsurance 4,479.2 4,699.3    
Liability for Future Policy Benefit, Gross Premium Income 1,646.5 1,574.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 72.1 78.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 5,569.3 5,839.5    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 0.0 $ 0.0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.30% 4.20%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.70% 4.60%    
Liability for Future Policy Benefit, Weighted-Average Duration 3 years 10 months 24 days 4 years    
Group Life and AD&D | Unum US        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year $ 0.0 $ 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 0.0 0.0    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 801.6 835.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 807.5 852.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (27.3) (20.3)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     780.2 832.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 260.9 [5] 269.5 [6]    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 8.5 9.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (266.8) (300.6)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 782.8 810.2    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (10.8) (10.7)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 772.0 799.5    
Liability for Future Policy Benefit, before Reinsurance, before Other 772.0 799.5    
Liability for Future Policy Benefit, Other 0.8 0.8    
Liability for Future Policy Benefit, before Reinsurance, after Other 772.8 800.3    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 6.8 5.4    
Liability for Future Policy Benefit, after Reinsurance 766.0 794.9    
Liability for Future Policy Benefit, Gross Premium Income 1,118.5 1,048.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 8.5 9.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 886.3 921.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 0.0 $ 0.0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 2.50% 2.40%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 2.80% 2.70%    
Liability for Future Policy Benefit, Weighted-Average Duration 2 years 4 months 24 days 2 years 6 months    
Individual Disability | Unum US        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year $ 1,236.5 $ 1,202.5    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 1,232.5 1,230.7    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (9.2) (39.0)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     1,223.3 1,191.7
Liability for Future Policy Benefit, Expected Net Premium, Issuance 82.5 117.6    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 25.9 25.7    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (94.9) (91.4)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 1,236.8 1,243.6    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (11.7) (7.4)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 1,225.1 1,236.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 3,140.7 3,096.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 3,150.4 3,191.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (11.3) (48.0)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     3,139.1 3,143.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 86.7 124.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 72.7 73.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (147.4) (145.6)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 3,151.1 3,195.0    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (52.5) (42.8)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 3,098.6 3,152.2    
Liability for Future Policy Benefit, before Reinsurance, before Other 1,873.5 1,916.0    
Liability for Future Policy Benefit, Other 26.3 27.1    
Liability for Future Policy Benefit, before Reinsurance, after Other 1,899.8 1,943.1    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 375.3 72.1    
Liability for Future Policy Benefit, after Reinsurance 1,524.5 1,871.0    
Liability for Future Policy Benefit, Gross Premium Income 345.6 339.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 46.8 47.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 5,076.4 5,148.8    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 5,818.2 5,820.4    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 4,192.8 $ 4,182.1    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.10% 5.10%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.20% 5.00%    
Liability for Future Policy Benefit, Weighted-Average Duration 9 years 3 months 18 days 9 years 6 months    
Voluntary Benefits | Unum US        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year $ 1,385.5 $ 1,240.2    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 1,447.3 1,335.3    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (35.8) (62.2)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     1,411.5 1,273.1
Liability for Future Policy Benefit, Expected Net Premium, Issuance 335.0 287.9    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 26.5 24.1    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (130.1) (112.8)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 1,642.9 1,472.3    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (75.2) (73.5)    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 1,567.7 1,398.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 2,536.9 2,362.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 2,751.1 2,614.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (38.2) (63.6)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     2,712.9 2,551.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 349.4 303.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 57.9 54.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (165.3) (139.3)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 2,954.9 2,769.6    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (238.3) (230.0)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 2,716.6 2,539.6    
Liability for Future Policy Benefit, before Reinsurance, before Other 1,148.9 1,140.8    
Liability for Future Policy Benefit, Other 4.9 2.8    
Liability for Future Policy Benefit, before Reinsurance, after Other 1,153.8 1,143.6    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 12.7 13.1    
Liability for Future Policy Benefit, after Reinsurance 1,141.1 1,130.5    
Liability for Future Policy Benefit, Gross Premium Income 478.7 440.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 31.4 30.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 6,186.4 5,868.1    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 6,928.6 6,329.2    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 4,393.2 $ 4,092.9    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.00% 5.00%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.60% 5.50%    
Liability for Future Policy Benefit, Weighted-Average Duration 18 years 1 month 6 days 18 years 2 months 12 days    
Other Insurance Product Line | Closed Block        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year $ 0.0 $ 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 0.0 0.0    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 6,785.8 7,138.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 7,056.2 7,591.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (11.2) (22.5)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     7,045.0 7,568.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 42.2 [7] 49.3 [8]    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 153.7 165.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (425.6) (458.8)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 6,815.3 7,324.0    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (355.6) (338.9)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 6,459.7 6,985.1    
Liability for Future Policy Benefit, before Reinsurance, before Other 6,459.7 6,985.1    
Liability for Future Policy Benefit, Other 1,382.5 [9] 1,452.8 [10]    
Liability for Future Policy Benefit, before Reinsurance, after Other 7,842.2 8,437.9    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 6,141.1 6,598.2    
Liability for Future Policy Benefit, after Reinsurance 1,701.1 1,839.7    
Liability for Future Policy Benefit, Gross Premium Income 69.8 83.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 153.7 165.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 9,854.3 10,667.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 0.0 $ 0.0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.60% 4.60%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.30% 5.20%    
Liability for Future Policy Benefit, Weighted-Average Duration 7 years 7 years 2 months 12 days    
Long-term Care | Closed Block        
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward]        
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year $ 7,732.7 $ 7,658.5    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period 7,484.3 7,592.9    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (217.0) (98.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change     7,267.3 7,494.6
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 188.9 194.7    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (321.6) (312.9)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 7,134.6 7,376.4    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 122.2 169.9    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change 7,256.8 7,546.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]        
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year 24,420.6 22,925.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period 24,113.6 22,953.7    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change     0.0 0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience     (52.8) (45.4)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change     $ 24,060.8 $ 22,908.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 629.7 599.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (591.4) (516.4)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period 24,099.1 22,991.7    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (2.0) 112.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year 24,097.1 23,103.8    
Liability for Future Policy Benefit, before Reinsurance, before Other 16,840.3 15,557.5    
Liability for Future Policy Benefit, Other 4.3 0.9    
Liability for Future Policy Benefit, before Reinsurance, after Other 16,844.6 15,558.4    
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 3,250.4 3.6    
Liability for Future Policy Benefit, after Reinsurance 13,594.2 15,554.8    
Liability for Future Policy Benefit, Gross Premium Income 353.6 352.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 440.8 405.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 57,891.4 59,062.4    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 11,848.3 13,215.7    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 7,295.0 $ 7,769.7    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.60% 5.60%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.60% 5.60%    
Liability for Future Policy Benefit, Weighted-Average Duration 14 years 2 months 12 days 15 years 3 months 18 days    
Liability for Future Policy Benefit, Adverse Development, Expense $ 63.6 $ (26.4)    
[1]
1Issuances include new policy issuances for most product lines. For our Unum US group disability, Unum US group life and AD&D and Closed Block - All Other product lines and certain of our Unum International product lines, this line represents new claim incurrals.
[2]
2Other primarily relates to our Closed Block - All Other product line.
[3] 1Unum US excludes the dental and vision product line and medical stop-loss products, Unum International excludes certain products in our supplemental product line and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.
[4]
1Issuances for Unum International primarily represent new claim incurrals.
[5]
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.
[6]
1Issuances include new policy issuances for most product lines. Issuances for Unum US group disability and Unum US group life and AD&D represents new claim incurrals.
[7]
1Issuances for Closed Block - All Other represents new claim incurrals.
[8]
1Issuances for Closed Block - All Other represents new claim incurrals.
[9]
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.
[10]
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.