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Liability for Future Policy Benefit, Activity (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Future Policy Benefits $ 40,009.4 $ 38,577.1 [1]      
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 2,071.1 2,619.1 $ 2,753.5    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 2,166.0 2,311.9 2,355.7    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   185.7 (97.1)   $ (48.5)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (90.2) (96.1)   (127.9)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   2,261.5 2,118.7   2,179.3
Liability for Future Policy Benefit, Expected Net Premium, Issuance 486.5 304.8 407.8    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 77.2 78.9 96.2    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (338.3) (336.4) (371.4)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 2,486.9 2,166.0 2,311.9    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (55.5) (94.9) 307.2    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 2,431.4 2,071.1 2,619.1    
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, balance beginning of year 11,698.2 14,564.4 15,402.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 12,177.3 12,671.7 12,874.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   77.8 (228.2)   (249.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (377.2) (384.6)   (404.1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   11,877.9 12,058.9   12,220.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [2] 2,007.7 2,083.8 2,382.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 442.1 476.4 531.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (2,378.2) (2,441.8) (2,462.8)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 11,949.5 12,177.3 12,671.7    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (197.0) (479.1) 1,892.7    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 11,752.5 11,698.2 14,564.4    
Liability for Future Policy Benefit, before Reinsurance, before Other 9,321.1 9,627.1 11,945.3    
Liability for Future Policy Benefits, Other Contracts 31.6 41.6 74.7    
Liability for Future Policy Benefit, before Reinsurance, after Other 9,352.7 9,668.7 12,020.0 $ 12,861.4  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 208.6 251.2 308.4 357.7 [3]  
Liability for Future Policy Benefit, after Reinsurance 9,144.1 9,417.5 11,711.6 12,503.7  
Gross premiums or assessments 6,263.2 6,021.7 5,853.8    
interest accretion 364.9 397.5 435.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 17,926.6 17,850.4 18,166.1    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 11,175.4 9,504.7 9,734.2    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 7,830.4 $ 6,901.2 $ 7,115.3    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.20% 4.00% 4.10%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.50% 4.70% 2.10%    
Liability for Future Policy Benefit, Weighted-Average Duration 7 years 6 years 9 months 18 days 6 years 6 months    
Future Policy Benefits [4] $ 9,352.7 $ 9,668.7 $ 12,020.0    
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 197.1 260.5 311.7    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 246.8 258.1 251.4    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   (5.1) (0.3)   0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   17.1 5.6   9.3
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   258.8 263.4   260.7
Liability for Future Policy Benefit, Expected Net Premium, Issuance 23.5 17.8 31.4    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 9.4 8.4 8.9    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (23.0) (22.2) (22.6)    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change 29.7 (20.6) (20.3)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 298.4 246.8 258.1    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (28.1) (49.7) 2.4    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 270.3 197.1 260.5    
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, balance beginning of year 2,231.4 3,181.8 3,465.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 2,495.5 2,703.8 2,644.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   17.7 (20.1)   (5.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   1.3 46.3   15.9
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   2,514.5 2,730.0   2,654.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [5] 335.2 327.7 391.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 63.5 64.9 75.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (388.3) (346.7) (360.3)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change 162.2 (280.4) (58.3)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 2,687.1 2,495.5 2,703.8    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (159.7) (264.1) 478.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 2,527.4 2,231.4 3,181.8    
Liability for Future Policy Benefit, before Reinsurance, before Other 2,257.1 2,034.3 2,921.3    
Liability for Future Policy Benefits, Other Contracts 36.1 28.9 34.5    
Liability for Future Policy Benefit, before Reinsurance, after Other 2,293.2 2,063.2 2,955.8 3,203.4  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 78.7 70.3 125.3 132.5 [3]  
Liability for Future Policy Benefit, after Reinsurance 2,214.5 1,992.9 2,830.5 3,070.9  
Gross premiums or assessments 849.0 786.8 793.9    
interest accretion 54.1 56.5 67.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 4,261.1 3,905.4 4,292.2    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 1,196.6 943.9 914.9    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 778.6 $ 626.2 $ 620.8    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.00% 4.00% 4.00%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.60% 5.00% 2.00%    
Liability for Future Policy Benefit, Weighted-Average Duration 8 years 7 months 6 days 8 years 7 months 6 days 8 years 9 months 18 days    
Future Policy Benefits $ 2,293.2 $ 2,063.2 $ 2,955.8    
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 3,745.4 4,597.0 4,671.9    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 4,046.4 4,158.9 4,233.7    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   (322.7) (32.3)   (157.1)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (53.5) (145.6)   (60.4)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   3,670.2 3,981.0   4,016.2
Liability for Future Policy Benefit, Expected Net Premium, Issuance 544.9 554.9 644.7    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 122.7 129.7 156.2    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (583.5) (619.2) (658.2)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 3,754.3 4,046.4 4,158.9    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (161.7) (301.0) 438.1    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 3,592.6 3,745.4 4,597.0    
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, balance beginning of year 5,581.1 7,054.8 7,022.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 6,163.9 6,201.5 6,169.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   (402.9) (85.9)   (178.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (52.0) (191.3)   (95.2)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   5,709.0 5,924.3   5,896.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance 605.9 628.5 704.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 211.3 217.0 243.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (601.0) (605.9) (642.0)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 5,925.2 6,163.9 6,201.5    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (359.2) (582.8) 853.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 5,566.0 5,581.1 7,054.8    
Liability for Future Policy Benefit, before Reinsurance, before Other 1,973.4 1,835.7 2,457.8    
Liability for Future Policy Benefits, Other Contracts 24.4 22.7 25.1    
Liability for Future Policy Benefit, before Reinsurance, after Other 1,997.8 1,858.4 2,482.9 2,528.6  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 1.8 1.1 2.3 4.4 [3]  
Liability for Future Policy Benefit, after Reinsurance 1,996.0 1,857.3 2,480.6 2,524.2  
Gross premiums or assessments 1,658.6 1,635.8 1,615.8    
interest accretion 88.6 87.3 86.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 9,796.7 10,011.9 9,583.1    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 11,903.1 12,221.3 11,487.9    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 8,702.2 $ 8,966.3 $ 8,566.7    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.30% 4.30% 4.40%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.80% 5.20% 2.70%    
Liability for Future Policy Benefit, Weighted-Average Duration 17 years 17 years 6 months 16 years 4 months 24 days    
Future Policy Benefits $ 1,997.8 $ 1,858.4 $ 2,482.9    
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 6,412.6 8,404.7 9,358.8    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 6,236.1 6,457.3 6,782.7    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   1,641.3 27.8   28.5
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   44.1 (33.5)   (149.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   7,921.5 6,451.6   6,661.9
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 374.7 349.0 370.6    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (592.6) (564.5) (575.2)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 7,703.6 6,236.1 6,457.3    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 419.9 176.5 1,947.4    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 8,123.5 6,412.6 8,404.7    
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, balance beginning of year 29,418.7 40,504.0 43,639.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 28,852.3 28,820.2 29,064.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   2,009.4 241.8   52.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   117.1 (5.5)   (152.5)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   30,978.8 29,056.5   28,964.7
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6] 123.4 154.5 197.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 1,510.3 1,477.9 1,508.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (1,868.6) (1,836.6) (1,850.6)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 30,743.9 28,852.3 28,820.2    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax 1,833.8 566.4 11,683.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 32,577.7 29,418.7 40,504.0    
Liability for Future Policy Benefit, before Reinsurance, before Other 24,454.2 23,006.1 32,099.3    
Liability for Future Policy Benefits, Other Contracts [7] 1,661.2 1,761.3 2,221.6    
Liability for Future Policy Benefit, before Reinsurance, after Other 26,115.4 24,767.4 34,320.9 36,992.0  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 7,466.9 7,805.5 9,912.1 10,001.4 [3]  
Liability for Future Policy Benefit, after Reinsurance 18,648.5 16,961.9 24,408.8 26,990.6  
Gross premiums or assessments 919.9 947.5 999.9    
interest accretion 1,135.6 1,128.9 1,138.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 73,341.4 65,293.0 66,533.5    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 14,486.4 12,629.9 13,159.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 8,241.7 $ 7,333.5 $ 7,518.9    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.20% 5.20% 5.20%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.90% 5.20% 2.70%    
Liability for Future Policy Benefit, Weighted-Average Duration 13 years 2 months 12 days 12 years 4 months 24 days 12 years 8 months 12 days    
Future Policy Benefits [4] $ 26,115.4 $ 24,767.4 $ 34,320.9    
Other Products          
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward]          
Future Policy Benefits [4] 250.3 219.4 212.0    
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 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   0.0 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   0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   0.0 0.0   0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 0.0 0.0 0.0    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 0.0 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, balance beginning of year 5,533.3 6,725.7 7,281.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 5,793.1 6,158.3 6,369.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   (100.2) (102.0)   (186.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (204.0) (239.4)   (229.3)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   5,488.9 5,816.9   5,954.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [2] 1,094.5 1,304.3 1,471.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 171.2 210.5 241.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (1,477.5) (1,538.6) (1,508.7)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 5,277.1 5,793.1 6,158.3    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (129.7) (259.8) 567.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 5,147.4 5,533.3 6,725.7    
Liability for Future Policy Benefit, before Reinsurance, before Other 5,147.4 5,533.3 6,725.7    
Liability for Future Policy Benefits, Other Contracts 0.2 0.4 0.5    
Liability for Future Policy Benefit, before Reinsurance, after Other 5,147.6 5,533.7 6,726.2 7,295.7  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 30.7 36.0 40.9 58.3  
Liability for Future Policy Benefit, after Reinsurance 5,116.9 5,497.7 6,685.3 7,237.4  
Gross premiums or assessments 2,958.7 2,791.7 2,672.4    
interest accretion 171.2 210.5 241.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 6,376.6 6,988.1 7,538.7    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 0.0 $ 0.0 $ 0.0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.00% 3.80% 4.00%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.60% 4.90% 2.10%    
Liability for Future Policy Benefit, Weighted-Average Duration 4 years 3 months 18 days 4 years 4 months 24 days 4 years 6 months    
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 $ 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   0.0 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   0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   0.0 0.0   0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 0.0 0.0 0.0    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 0.0 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, balance beginning of year 972.6 1,124.1 1,126.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 998.5 1,058.3 1,034.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   0.0 (32.9)   0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (37.0) (34.3)   4.0
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   961.5 991.1   1,038.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [2] 394.2 444.1 467.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 20.0 24.5 34.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (439.2) (461.2) (482.5)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 936.5 998.5 1,058.3    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (14.5) (25.9) 65.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 922.0 972.6 1,124.1    
Liability for Future Policy Benefit, before Reinsurance, before Other 922.0 972.6 1,124.1    
Liability for Future Policy Benefits, Other Contracts 1.0 0.9 1.2    
Liability for Future Policy Benefit, before Reinsurance, after Other 923.0 973.5 1,125.3 1,127.3  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 7.2 7.5 4.4 3.0  
Liability for Future Policy Benefit, after Reinsurance 915.8 966.0 1,120.9 1,124.3  
Gross premiums or assessments 1,878.0 1,864.9 1,827.5    
interest accretion 20.0 24.5 34.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 1,063.2 1,133.0 1,224.7    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 0.0 $ 0.0 $ 0.0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 2.20% 2.20% 2.30%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 2.60% 2.70% 1.30%    
Liability for Future Policy Benefit, Weighted-Average Duration 2 years 7 months 6 days 2 years 7 months 6 days 2 years 10 months 24 days    
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 $ 868.2 $ 1,124.8 $ 1,239.3    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 937.9 1,032.3 1,146.9    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   180.7 (23.4)   (29.6)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (79.8) (70.9)   (117.5)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   1,038.8 938.0   999.8
Liability for Future Policy Benefit, Expected Net Premium, Issuance 288.6 136.2 196.5    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 29.0 29.1 38.3    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (163.9) (165.4) (202.3)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 1,192.5 937.9 1,032.3    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax (57.8) (69.7) 92.5    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 1,134.7 868.2 1,124.8    
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, balance beginning of year 1,999.5 2,697.3 2,768.1    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 2,141.2 2,201.8 2,272.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   170.1 (39.9)   (40.3)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (90.9) (74.9)   (136.5)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   2,220.4 2,087.0   2,095.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [2] 303.7 154.0 220.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 86.2 86.1 96.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (188.3) (185.9) (211.5)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 2,422.0 2,141.2 2,201.8    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (87.5) (141.7) 495.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 2,334.5 1,999.5 2,697.3    
Liability for Future Policy Benefit, before Reinsurance, before Other 1,199.8 1,131.3 1,572.5    
Liability for Future Policy Benefits, Other Contracts 2.6 15.6 14.0    
Liability for Future Policy Benefit, before Reinsurance, after Other 1,202.4 1,146.9 1,586.5 1,659.2  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 14.0 14.1 31.2 35.7  
Liability for Future Policy Benefit, after Reinsurance 1,188.4 1,132.8 1,555.3 1,623.5  
Gross premiums or assessments 789.9 773.6 773.8    
interest accretion 57.2 57.0 58.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 5,173.1 4,561.1 4,192.1    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 5,450.6 3,979.6 4,136.9    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 3,717.5 $ 2,939.1 $ 3,156.5    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.00% 5.10% 5.10%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.90% 5.20% 2.80%    
Liability for Future Policy Benefit, Weighted-Average Duration 18 years 1 month 6 days 17 years 9 months 18 days 15 years 9 months 18 days    
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 $ 1,202.9 $ 1,494.3 $ 1,514.2    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 1,228.1 1,279.6 1,208.8    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   5.0 (73.7)   (18.9)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (10.4) (25.2)   (10.4)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   1,222.7 1,180.7   1,179.5
Liability for Future Policy Benefit, Expected Net Premium, Issuance 197.9 168.6 211.3    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 48.2 49.8 57.9    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (174.4) (171.0) (169.1)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 1,294.4 1,228.1 1,279.6    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 2.3 (25.2) 214.7    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 1,296.7 1,202.9 1,494.3    
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, balance beginning of year 3,192.8 4,017.3 4,226.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 3,244.5 3,253.3 3,197.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   7.9 (53.4)   (22.9)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (45.3) (36.0)   (42.3)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   3,207.1 3,163.9   3,132.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [2] 215.3 181.4 222.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 164.7 155.3 158.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (273.2) (256.1) (260.1)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 3,313.9 3,244.5 3,253.3    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax 34.7 (51.7) 764.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 3,348.6 3,192.8 4,017.3    
Liability for Future Policy Benefit, before Reinsurance, before Other 2,051.9 1,989.9 2,523.0    
Liability for Future Policy Benefits, Other Contracts 27.8 24.7 59.0    
Liability for Future Policy Benefit, before Reinsurance, after Other 2,079.7 2,014.6 2,582.0 2,767.7  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 156.7 193.6 231.9 260.6  
Liability for Future Policy Benefit, after Reinsurance 1,923.0 1,821.0 2,350.1 2,507.1  
Gross premiums or assessments 636.6 591.5 580.1    
interest accretion 116.5 105.5 100.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 5,313.7 5,168.2 5,210.6    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 5,724.8 5,525.1 5,597.3    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 4,112.9 $ 3,962.1 $ 3,958.8    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.10% 5.10% 5.00%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.80% 5.10% 2.40%    
Liability for Future Policy Benefit, Weighted-Average Duration 9 years 7 months 6 days 9 years 4 months 24 days 9 years 6 months    
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 $ 6,412.6 $ 8,404.7 $ 9,358.8    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 6,236.1 6,457.3 6,782.7    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   1,641.3 27.8   28.5
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   44.1 (33.5)   (149.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   7,921.5 6,451.6   6,661.9
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 374.7 349.0 370.6    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (592.6) (564.5) (575.2)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 7,703.6 6,236.1 6,457.3    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 419.9 176.5 1,947.4    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 8,123.5 6,412.6 8,404.7    
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, balance beginning of year 21,199.9 30,089.6 32,047.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 20,221.6 19,870.8 19,549.7    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   2,009.4 24.9   52.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   113.1 (36.2)   (170.8)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   22,344.1 19,859.5   19,431.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6] 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 1,151.4 1,105.1 1,111.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (846.2) (743.0) (672.6)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 22,649.3 20,221.6 19,870.8    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax 2,048.4 978.3 10,218.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 24,697.7 21,199.9 30,089.6    
Liability for Future Policy Benefit, before Reinsurance, before Other 16,574.2 14,787.3 21,684.9    
Liability for Future Policy Benefits, Other Contracts [7] 23.1 24.3 29.8    
Liability for Future Policy Benefit, before Reinsurance, after Other 16,597.3 14,811.6 21,714.7 22,740.9  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 4.5 5.7 7.4 44.4  
Liability for Future Policy Benefit, after Reinsurance 16,592.8 14,805.9 21,707.3 22,696.5  
Gross premiums or assessments 696.1 697.5 705.0    
interest accretion 776.7 756.1 741.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 61,447.7 52,544.0 53,395.1    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 14,486.4 12,629.9 13,159.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 8,241.7 $ 7,333.5 $ 7,518.9    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 5.60% 5.50% 5.60%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 5.00% 5.20% 2.80%    
Liability for Future Policy Benefit, Weighted-Average Duration 16 years 4 months 24 days 15 years 6 months 16 years 3 months 18 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 $ 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   0.0 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   0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   0.0 0.0   0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 0.0 0.0 0.0    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 0.0 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, balance beginning of year 8,218.8 10,414.4 11,591.9    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 8,630.7 8,949.4 9,514.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   0.0 216.9   0.0
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   4.0 30.7   18.3
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   8,634.7 9,197.0   9,532.9
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [6] 123.4 154.5 197.3    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 358.9 372.8 397.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (1,022.4) (1,093.6) (1,178.0)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 8,094.6 8,630.7 8,949.4    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax (214.6) (411.9) 1,465.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 7,880.0 8,218.8 10,414.4    
Liability for Future Policy Benefit, before Reinsurance, before Other 7,880.0 8,218.8 10,414.4    
Liability for Future Policy Benefits, Other Contracts [7] 1,638.1 1,737.0 2,191.8    
Liability for Future Policy Benefit, before Reinsurance, after Other 9,518.1 9,955.8 12,606.2 14,251.1  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 7,462.4 7,799.8 9,904.7 9,957.0  
Liability for Future Policy Benefit, after Reinsurance 2,055.7 2,156.0 2,701.5 4,294.1  
Gross premiums or assessments 223.8 250.0 294.9    
interest accretion 358.9 372.8 397.2    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 11,893.7 12,749.0 13,138.4    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 0.0 0.0 0.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 0.0 $ 0.0 $ 0.0    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.60% 4.60% 4.60%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.90% 5.10% 2.50%    
Liability for Future Policy Benefit, Weighted-Average Duration 7 years 3 months 18 days 7 years 4 months 24 days 7 years 3 months 18 days    
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 $ 12,426.2 $ 15,881.3 $ 17,095.9    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance beginning of year 12,695.3 13,186.2 13,623.5    
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change   1,499.2 (101.9)   (177.1)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (82.5) (269.6)   (328.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change   14,112.0 12,814.7   13,118.1
Liability for Future Policy Benefit, Expected Net Premium, Issuance 1,054.9 877.5 1,083.9    
Liability for Future Policy Benefit, Expected Net Premium, Interest Income 584.0 566.0 631.9    
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected (1,537.4) (1,542.3) (1,627.4)    
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change 29.7 (20.6) (20.3)    
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance end of period 14,243.2 12,695.3 13,186.2    
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax 174.6 (269.1) 2,695.1    
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period 14,417.8 12,426.2 15,881.3    
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, balance beginning of year 48,929.4 65,305.0 69,530.5    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of year 49,689.0 50,397.2 50,752.4    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change   1,702.0 (92.4)   (379.9)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience   (310.8) (535.1)   (635.9)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change   51,080.2 49,769.7   $ 49,736.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance [8] 3,072.2 3,194.5 3,675.0    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense 2,227.2 2,236.2 2,359.6    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment (5,236.1) (5,231.0) (5,315.7)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change 162.2 (280.4) (58.3)    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period 51,305.7 49,689.0 50,397.2    
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax 1,117.9 (759.6) 14,907.8    
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of period 52,423.6 48,929.4 65,305.0    
Liability for Future Policy Benefit, before Reinsurance, before Other 38,005.8 36,503.2 49,423.7    
Liability for Future Policy Benefits, Other Contracts 1,753.3 1,854.5 2,355.9    
Liability for Future Policy Benefit, before Reinsurance, after Other 39,759.1 38,357.7 51,779.6 55,585.4  
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance 7,756.1 8,128.2 10,348.2 10,496.0 [3]  
Liability for Future Policy Benefit, after Reinsurance 32,003.0 30,229.5 41,431.4 $ 45,089.4  
Gross premiums or assessments 9,690.7 9,391.8 9,263.4    
interest accretion 1,643.2 1,670.2 1,727.7    
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance 105,325.8 97,060.7 98,574.9    
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance 38,761.5 35,299.8 35,296.0    
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance $ 25,552.9 $ 23,827.2 $ 23,821.7    
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate 4.80% 4.80% 4.80%    
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate 4.80% 5.00% 2.50%    
Liability for Future Policy Benefit, Weighted-Average Duration 11 years 6 months 10 years 10 months 24 days 10 years 10 months 24 days    
Future Policy Benefits $ 40,009.4 $ 38,577.1 $ 51,991.6    
[1]
2We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2022 of $1,839.8 million and $42,330.2 million, respectively, resulting in total policyholder liabilities of $44,170.0 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $38,443.2 million and $5,726.8 million, respectively, as of December 31, 2022, resulting in total policyholder liabilities of $44,170.0 million under the historical accounting method.
[2]
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.
[3]
5These amounts represent the portion of reinsurance recoverable related to the liability for future policy benefits. These amounts include the adjustments for the removal of shadow adjustments and for the effect of change in discount rate assumptions for the liability for future policy benefits ceded to third party reinsurers.
[4]
1Unum US excludes dental & vision and medical stop-loss product lines and Closed Block excludes our participating fund account, which represents policies issued by one of our subsidiaries prior to its 1986 conversion from a mutual stock life insurance company. The liabilities associated with these products are included within Other products.
[5]
1Issuances for Unum International primarily represent new claim incurrals.
[6]
1Issuances for Closed Block - All Other represents new claim incurrals.
[7]
2Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.
[8]
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.