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Liability for Future Policy Benefit Activity (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change |  | $ 49.3 |  | $ (83.9) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits |  | 39,351.5 |  | 46,474.7 | [1] | $ 38,577.1 | [2] |  |  |  |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 2,390.0 |  | 2,345.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 418.1 |  | 426.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 96,591.0 |  | 97,828.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 35,284.9 |  | 35,260.2 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 23,805.9 |  | $ 23,907.2 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 4.80% |  | 4.70% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 4.80% |  | 3.40% |  | 5.00% |  | 2.50% |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 10 years 10 months 24 days |  |  |  |  |  |  | 10 years 9 months 18 days |  |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 12,426.2 |  | $ 15,881.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance |  | 12,695.3 |  | 13,186.2 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | (131.9) |  | (115.9) |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 12,563.4 |  | 13,070.3 |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 138.7 |  | 147.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 315.8 |  | 349.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change |  | 3.4 |  | (10.3) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (393.7) |  | (418.8) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 12,627.6 |  | 13,137.8 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | (27.0) |  | 1,371.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period |  | 12,600.6 |  | 14,509.2 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 48,929.4 |  | 65,305.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 49,529.9 |  | 50,251.2 |  | 49,689.0 |  | 50,397.2 |  |  |  |  |
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 |  |  |  |  |  | (283.4) |  | (185.7) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 49,405.6 |  | 50,211.5 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance | [3] | 1,131.4 |  | 1,208.1 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 556.8 |  | 573.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (1,613.2) |  | (1,658.1) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change |  | 49.3 |  | (83.9) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 49,875.2 |  | 58,563.6 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | 345.3 |  | 8,312.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 37,274.6 |  | 44,054.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits |  | 39,351.5 |  | 46,474.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 1,849.5 |  | 2,196.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 39,124.1 |  | 46,251.1 |  |  |  |  |  |  |  | $ 45,704.4 | [4]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 8,148.2 |  | 9,424.6 |  |  |  |  |  | $ 10,496.0 | [5] |  |
Liability for Future Policy Benefit, after Reinsurance |  | 30,975.9 |  | 36,826.5 |  |  |  |  |  | 45,089.4 |  |  |
Unum US |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | 2,071.1 |  | 2,619.1 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance |  | 2,166.0 |  | 2,311.9 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | (98.5) |  | (76.2) |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 2,067.5 |  | 2,235.7 |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 19.3 |  | 21.2 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 134.5 |  | 150.1 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (82.5) |  | (94.0) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 2,138.8 |  | 2,313.0 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | (57.2) |  | 106.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period |  | 2,081.6 |  | 2,419.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 11,698.2 |  | 14,564.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 11,981.2 |  | 12,600.5 |  | 12,177.3 |  | 12,671.7 |  |  |  |  |
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 |  |  |  |  |  | (250.6) |  | (141.3) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 11,926.7 |  | 12,530.4 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 796.2 |  | 848.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 120.4 |  | 126.5 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (862.1) |  | (905.2) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 11,707.4 |  | 13,441.9 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (273.8) |  | 841.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 9,625.8 |  | 11,022.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits | [6] | 9,671.3 |  | 11,093.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 45.5 |  | 71.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 9,671.3 |  | 11,093.3 |  |  |  |  |  |  |  | 12,184.6 | [4]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 255.8 |  | 308.2 |  |  |  |  |  | 357.7 | [5] |  |
Liability for Future Policy Benefit, after Reinsurance |  | 9,415.5 |  | 10,785.1 |  |  |  |  |  | 12,503.7 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 1,537.0 |  | 1,487.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 101.1 |  | 105.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 17,632.6 |  | 17,986.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 9,481.2 |  | 9,720.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 6,864.4 |  | $ 7,135.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 4.10% |  | 4.10% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 4.50% |  | 3.20% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 6 years 9 months 18 days |  | 6 years 6 months |  |  |  |  |  |  |  |  |
Unum International |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 197.1 |  | $ 260.5 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance |  | 246.8 |  | 258.1 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 4.5 |  | 2.2 |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 251.3 |  | 260.3 |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 2.2 |  | 2.1 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 6.3 |  | 5.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change |  | 3.4 |  | (10.3) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (5.2) |  | (5.7) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 258.0 |  | 251.4 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | (38.4) |  | (27.2) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period |  | 219.6 |  | 224.2 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 2,231.4 |  | 3,181.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 2,549.5 |  | 2,640.4 |  | 2,495.5 |  | 2,703.8 |  |  |  |  |
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 |  |  |  |  |  | 2.2 |  | 15.7 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 2,497.7 |  | 2,719.5 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance | [7] | 105.4 |  | 105.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 15.7 |  | 18.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (118.6) |  | (118.8) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 2,337.7 |  | 2,785.1 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (211.8) |  | 144.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 2,118.1 |  | 2,560.9 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits |  | 2,148.6 |  | 2,592.1 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 30.5 |  | 31.2 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 2,148.6 |  | 2,592.1 |  |  |  |  |  |  |  | 2,969.8 | [4]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 74.7 |  | 101.0 |  |  |  |  |  | 132.5 | [5] |  |
Liability for Future Policy Benefit, after Reinsurance |  | 2,073.9 |  | 2,491.1 |  |  |  |  |  | 3,070.9 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 208.5 |  | 205.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 13.5 |  | 15.9 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 3,988.8 |  | 4,181.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 995.8 |  | 902.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 657.2 |  | $ 609.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 3.90% |  | 3.90% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 4.80% |  | 3.00% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 8 years 7 months 6 days |  | 8 years 9 months 18 days |  |  |  |  |  |  |  |  |
Colonial Life |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 3,745.4 |  | $ 4,597.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance |  | 4,046.4 |  | 4,158.9 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | (46.3) |  | 4.0 |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 4,000.1 |  | 4,162.9 |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 33.0 |  | 34.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 175.0 |  | 194.5 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (164.1) |  | (176.9) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 4,044.0 |  | 4,215.2 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | (229.5) |  | 110.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period |  | 3,814.5 |  | 4,325.9 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 5,581.1 |  | 7,054.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 6,196.4 |  | 6,287.8 |  | 6,163.9 |  | 6,201.5 |  |  |  |  |
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 |  |  |  |  |  | (39.5) |  | (7.3) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 6,124.4 |  | 6,194.2 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 184.9 |  | 203.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 55.4 |  | 56.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (168.3) |  | (166.5) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 5,735.9 |  | 6,536.6 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (460.5) |  | 248.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 1,921.4 |  | 2,210.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits |  | 1,942.1 |  | 2,236.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 20.7 |  | 26.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 1,942.1 |  | 2,236.7 |  |  |  |  |  |  |  | 1,977.2 | [4]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 0.8 |  | 1.9 |  |  |  |  |  | 4.4 | [5] |  |
Liability for Future Policy Benefit, after Reinsurance |  | 1,941.3 |  | 2,234.8 |  |  |  |  |  | 2,524.2 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 412.2 |  | 412.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 22.4 |  | 22.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 10,121.7 |  | 9,697.9 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 12,359.9 |  | 11,653.5 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 9,030.0 |  | $ 8,717.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 4.30% |  | 4.40% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.00% |  | 3.60% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 17 years 4 months 24 days |  | 16 years 6 months |  |  |  |  |  |  |  |  |
Closed Block |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 6,412.6 |  | $ 8,404.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance |  | 6,236.1 |  | 6,457.3 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 8.4 |  | (45.9) |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 6,244.5 |  | 6,411.4 |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 84.2 |  | 89.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (141.9) |  | (142.2) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 6,186.8 |  | 6,358.2 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | 298.1 |  | 1,181.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period |  | 6,484.9 |  | 7,539.5 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 29,418.7 |  | 40,504.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 28,802.8 |  | 28,722.5 |  | 28,852.3 |  | 28,820.2 |  |  |  |  |
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 |  |  |  |  |  | 4.5 |  | (52.8) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 28,856.8 |  | 28,767.4 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 44.9 |  | 50.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 365.3 |  | 372.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (464.2) |  | (467.6) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 30,094.2 |  | 35,800.0 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | 1,291.4 |  | 7,077.5 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 23,609.3 |  | 28,260.5 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits |  | 25,362.1 |  | 30,329.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 1,752.8 |  | 2,068.5 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 25,362.1 |  | 30,329.0 |  |  |  |  |  |  |  | 28,572.8 | [4]
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 7,816.8 |  | 9,013.4 |  |  |  |  |  | 10,001.4 | [5] |  |
Liability for Future Policy Benefit, after Reinsurance |  | 17,545.3 |  | 21,315.6 |  |  |  |  |  | 26,990.6 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 232.3 |  | 240.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 281.1 |  | 283.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 64,847.9 |  | 65,962.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 12,448.0 |  | 12,984.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 7,254.3 |  | $ 7,445.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 5.20% |  | 5.20% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.00% |  | 3.60% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 12 years 3 months 18 days |  | 12 years 7 months 6 days |  |  |  |  |  |  |  |  |
Other Products |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits |  | $ 227.4 |  | $ 223.6 |  |  |  |  |  |  |  |  |
Group Disability | Unum US |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 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, Issuance |  | 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, balance end of period |  | 0.0 |  | 0.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 5,533.3 |  | 6,725.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 5,678.3 |  | 6,116.6 |  | 5,793.1 |  | 6,158.3 |  |  |  |  |
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 |  |  |  |  |  | (107.5) |  | (56.4) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 5,685.6 |  | 6,101.9 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 425.3 | [8] | 448.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 52.2 |  | 58.3 | [9] |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (484.8) |  | (492.4) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 5,498.8 |  | 6,313.9 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (179.5) |  | 197.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 5,498.8 |  | 6,313.9 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 0.5 |  | 0.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 5,499.3 |  | 6,314.5 |  |  |  |  |  |  |  | 7,409.0 |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 42.5 |  | 58.0 |  |  |  |  |  | 58.3 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 5,456.8 |  | 6,256.5 |  |  |  |  |  | 7,237.4 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 718.2 |  | 676.1 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 52.2 |  | 58.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 6,834.2 |  | 7,396.0 |  |  |  |  |  |  |  |  |
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 |  | 3.80% |  | 3.90% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 4.60% |  | 3.10% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 4 years 3 months 18 days |  | 4 years 3 months 18 days |  |  |  |  |  |  |  |  |
Group Life and AD&D | Unum US |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 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, Issuance |  | 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, balance end of period |  | 0.0 |  | 0.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 972.6 |  | 1,124.1 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 952.4 |  | 1,006.1 |  | 998.5 |  | 1,058.3 |  |  |  |  |
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 |  |  |  |  |  | (21.2) |  | (7.6) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 977.3 |  | 1,050.7 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 228.4 | [8] | 242.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 5.9 |  | 6.8 | [9] |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (259.2) |  | (294.2) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 933.6 |  | 1,030.7 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (18.8) |  | 24.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 933.6 |  | 1,030.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 0.9 |  | 0.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 934.5 |  | 1,031.5 |  |  |  |  |  |  |  | 1,123.9 |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 5.6 |  | 4.7 |  |  |  |  |  | 3.0 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 928.9 |  | 1,026.8 |  |  |  |  |  | 1,124.3 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 462.2 |  | 460.1 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 5.9 |  | 6.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 1,085.2 |  | 1,168.8 |  |  |  |  |  |  |  |  |
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 |  | 2.20% |  | 2.40% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 2.70% |  | 2.00% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 2 years 8 months 12 days |  | 3 years |  |  |  |  |  |  |  |  |
Individual Disability | Unum US |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 1,202.9 |  | $ 1,494.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance |  | 1,228.1 |  | 1,279.6 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | (24.9) |  | (22.1) |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 1,203.2 |  | 1,257.5 |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 12.3 |  | 13.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 48.8 |  | 48.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (44.7) |  | (45.7) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 1,219.6 |  | 1,273.5 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | (6.3) |  | 105.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period |  | 1,213.3 |  | 1,379.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 3,192.8 |  | 4,017.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 3,230.7 |  | 3,257.1 |  | 3,244.5 |  | 3,253.3 |  |  |  |  |
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 |  |  |  |  |  | (36.0) |  | (20.5) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 3,208.5 |  | 3,232.8 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 50.2 |  | 49.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 41.0 |  | 39.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (69.0) |  | (64.6) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 3,245.9 |  | 3,666.4 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | 15.2 |  | 409.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 2,032.6 |  | 2,287.1 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 27.5 |  | 54.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 2,060.1 |  | 2,341.5 |  |  |  |  |  |  |  | 2,485.3 |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 195.2 |  | 216.8 |  |  |  |  |  | 260.6 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 1,864.9 |  | 2,124.7 |  |  |  |  |  | 2,507.1 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 157.3 |  | 148.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 28.7 |  | 25.9 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 5,148.4 |  | 5,199.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 5,540.1 |  | 5,567.9 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 3,973.7 |  | $ 3,953.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 5.10% |  | 5.00% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 4.80% |  | 3.40% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 9 years 4 months 24 days |  | 9 years 6 months |  |  |  |  |  |  |  |  |
Voluntary Benefits | Unum US |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 868.2 |  | $ 1,124.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance |  | 937.9 |  | 1,032.3 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | (73.6) |  | (54.1) |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 864.3 |  | 978.2 |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 7.0 |  | 7.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 85.7 |  | 101.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (37.8) |  | (48.3) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 919.2 |  | 1,039.5 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | (50.9) |  | 0.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period |  | 868.3 |  | 1,040.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 1,999.5 |  | 2,697.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 2,119.8 |  | 2,220.7 |  | 2,141.2 |  | 2,201.8 |  |  |  |  |
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 |  |  |  |  |  | (85.9) |  | (56.8) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 2,055.3 |  | 2,145.0 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 92.3 |  | 107.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 21.3 |  | 22.1 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (49.1) |  | (54.0) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 2,029.1 |  | 2,430.9 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (90.7) |  | 210.2 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 1,160.8 |  | 1,390.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 16.6 |  | 15.2 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 1,177.4 |  | 1,405.8 |  |  |  |  |  |  |  | 1,154.9 |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 12.5 |  | 28.7 |  |  |  |  |  | 35.7 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 1,164.9 |  | 1,377.1 |  |  |  |  |  | 1,623.5 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 199.3 |  | 202.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 14.3 |  | 14.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 4,564.8 |  | 4,222.2 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 3,941.1 |  | 4,152.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 2,890.7 |  | $ 3,182.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 5.10% |  | 5.10% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.00% |  | 3.60% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 17 years 10 months 24 days |  | 15 years 10 months 24 days |  |  |  |  |  |  |  |  |
Other Insurance Product Line | Closed Block |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  | 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, balance end of period |  | 0.0 |  | 0.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 8,218.8 |  | 10,414.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 8,492.3 |  | 8,801.3 |  | 8,630.7 |  | 8,949.4 |  |  |  |  |
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 |  |  |  |  |  | (8.1) |  | (2.3) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 8,622.6 |  | 8,947.1 |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 44.9 | [10] | 50.3 | [11] |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 90.6 |  | 95.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (265.8) |  | (291.5) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 8,235.9 |  | 9,454.2 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (256.4) |  | 652.9 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 8,235.9 |  | 9,454.2 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 1,727.5 | [12] | 2,041.2 | [13] |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 9,963.4 |  | 11,495.4 |  |  |  |  |  |  |  | 12,289.4 |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 7,811.2 |  | 9,006.7 |  |  |  |  |  | 9,957.0 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 2,152.2 |  | 2,488.7 |  |  |  |  |  | 4,294.1 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 57.2 |  | 65.9 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 90.6 |  | 95.4 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 12,535.7 |  | 12,910.9 |  |  |  |  |  |  |  |  |
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 |  | 4.90% |  | 3.50% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 7 years 4 months 24 days |  | 7 years 3 months 18 days |  |  |  |  |  |  |  |  |
Long-term Care | Closed Block |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 6,412.6 |  | $ 8,404.7 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance |  | 6,236.1 |  | 6,457.3 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 8.4 |  | (45.9) |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 6,244.5 |  | 6,411.4 |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 84.2 |  | 89.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (141.9) |  | (142.2) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 6,186.8 |  | 6,358.2 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | 298.1 |  | 1,181.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance end of period |  | 6,484.9 |  | 7,539.5 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 21,199.9 |  | 30,089.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance |  | 20,310.5 |  | 19,921.2 |  | 20,221.6 |  | 19,870.8 |  |  |  |  |
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 |  |  |  |  |  | 12.6 |  | (50.5) |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | $ 20,234.2 |  | $ 19,820.3 |  |  |  |  |
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 |  | 274.7 |  | 277.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (198.4) |  | (176.1) |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, balance end of year |  | 21,858.3 |  | 26,345.8 |  |  |  |  |  |  |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | 1,547.8 |  | 6,424.6 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance |  | 15,373.4 |  | 18,806.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefits, Other Contracts |  | 25.3 |  | 27.3 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after other |  | 15,398.7 |  | 18,833.6 |  |  |  |  |  |  |  | $ 16,283.4 |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 5.6 |  | 6.7 |  |  |  |  |  | 44.4 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 15,393.1 |  | 18,826.9 |  |  |  |  |  | $ 22,696.5 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 175.1 |  | 174.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Interest Expense |  | 190.5 |  | 188.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 52,312.2 |  | 53,051.9 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 12,448.0 |  | 12,984.0 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 7,254.3 |  | $ 7,445.8 |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 5.60% |  | 5.50% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.00% |  | 3.60% |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 15 years 3 months 18 days |  | 16 years 1 month 6 days |  |  |  |  |  |  |  |  |
[1] | 2 We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of March 31, 2022 of $1,874.2 million and $45,258.0 million, respectively, resulting in total policyholder liabilities of $47,132.2 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $41,368.2 million and $5,764.0 million, respectively, as of March 31, 2022, resulting in total policyholder liabilities of $47,132.2 million under the historical accounting method.
[2] | 1 We 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.
[3] | 1 Issuances 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.
[4] | 1 We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of December 31, 2020 of $1,855.4 million and $49,653.0 million, respectively, resulting in total policyholder liabilities of $51,508.4 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $45,704.4 million and $5,804.0 million as of December 31, 2020, respectively, resulting in total policyholder liabilities of $51,508.4 million under the historical accounting method. These balances were reclassified to more closely align with the new disclosure requirements of ASU 2018-12.
[5] | 5 These 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.
[6] | 1 Unum 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.
[7] | 1 Issuances for Unum International primarily represents new claim incurrals.
[8] | 1 Issuances 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.
[9] | 1 Issuances 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.
[10] | 1 Issuances for Closed Block - All Other represents new claim incurrals.
[11] | 1 Issuances for Closed Block - All Other represents new claim incurrals.
[12] | 2 Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.
[13] | 2 Other for Closed Block - All Other primarily includes our closed block group pension products and certain of our ceded closed block individual life products.

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