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Liability for Future Policy Benefit Activity (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Future Policy Benefits |  | $ 38,300.7 |  |  |  | $ 36,806.4 |
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 |  | 13,930.6 |  | $ 14,417.8 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 14,266.9 |  | 14,243.2 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | 161.7 | $ 73.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (229.0) | (151.9)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 14,199.6 | 14,164.3
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 941.3 |  | 856.7 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 482.2 |  | 481.8 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (1,258.7) |  | (1,222.6) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change |  | 42.7 |  | 7.3 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 14,407.1 |  | 14,287.5 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | 65.1 |  | 319.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 14,472.2 |  | 14,606.5 |  |  |
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, beginning of year |  | 48,920.1 |  | 52,423.6 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 50,778.2 |  | 51,305.7 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | 715.9 | (248.5)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (292.3) | (355.6)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | $ 51,201.8 | $ 50,701.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance | [1] | 2,588.5 |  | 2,506.9 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 1,703.4 |  | 1,707.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (4,120.3) |  | (4,078.4) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change |  | 228.8 |  | 121.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 51,602.2 |  | 50,958.4 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (565.1) |  | 1,204.1 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 51,037.1 |  | 52,162.5 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 36,564.9 |  | 37,556.0 |  |  |
Liability for Future Policy Benefit, Other |  | 1,539.6 |  | 1,655.7 |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 38,104.5 |  | 39,211.7 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 10,434.7 |  | 7,455.9 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 27,669.8 |  | 31,755.8 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 7,866.7 |  | 7,568.4 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 1,221.2 |  | 1,225.5 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 102,872.2 |  | 104,039.1 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 39,457.2 |  | 39,394.1 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 26,202.4 |  | $ 25,941.4 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 4.90% |  | 4.90% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.10% |  | 4.80% |  | 5.30% | 4.80%
Liability for Future Policy Benefit, Weighted-Average Duration |  | 11 years 2 months 12 days |  | 11 years 6 months |  |  |
Future Policy Benefits |  | $ 38,300.7 |  | $ 39,444.5 |  |  |
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 |  | 2,442.7 |  | 2,431.4 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 2,566.0 |  | 2,486.9 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | $ (86.5) | $ (58.7)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (84.9) | (77.4)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 2,394.6 | 2,350.8
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 487.8 |  | 414.2 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 72.5 |  | 69.7 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (298.0) |  | (283.6) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 2,656.9 |  | 2,551.1 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | (49.4) |  | (25.0) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 2,607.5 |  | 2,526.1 |  |  |
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, beginning of year |  | 11,030.0 |  | 11,752.5 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 11,565.8 |  | 11,949.5 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | (232.7) | (197.2)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (182.9) | (302.1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 11,150.2 | 11,450.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 1,736.5 |  | 1,669.2 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 312.4 |  | 322.5 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (1,838.2) |  | (1,845.0) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 11,360.9 |  | 11,596.9 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (258.5) |  | (75.6) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 11,102.4 |  | 11,521.3 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 8,494.9 |  | 8,995.2 |  |  |
Liability for Future Policy Benefit, Other |  | 30.4 |  | 31.7 |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 8,525.3 |  | 9,026.9 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 421.2 |  | 200.8 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 8,104.1 |  | 8,826.1 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 5,103.9 |  | 4,906.6 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 239.9 |  | 252.8 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 17,420.3 |  | 17,640.3 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 12,012.5 |  | 11,639.4 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 8,196.1 |  | $ 8,034.8 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 4.40% |  | 4.30% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 4.50% |  | 4.30% |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 7 years |  | 7 years 1 month 6 days |  |  |
Future Policy Benefits | [2] | $ 8,525.3 |  | $ 9,026.9 |  |  |
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 |  | 276.1 |  | 270.3 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 314.2 |  | 298.4 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | (7.8) | (5.9)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | 5.3 | 15.1
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 311.7 | 307.6
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 26.8 |  | 25.3 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 10.1 |  | 8.7 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (24.6) |  | (21.2) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change |  | 42.7 |  | 7.3 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 366.7 |  | 327.7 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | (32.3) |  | (27.9) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 334.4 |  | 299.8 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 2,391.6 |  | 2,527.4 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 2,641.5 |  | 2,687.1 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | (15.1) | 0.1
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (7.5) | (13.4)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 2,618.9 | 2,673.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance | [3] | 320.5 |  | 300.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 55.5 |  | 51.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (339.2) |  | (326.4) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change |  | 228.8 |  | 121.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 2,884.5 |  | 2,820.0 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (272.1) |  | (214.9) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 2,612.4 |  | 2,605.1 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 2,278.0 |  | 2,305.3 |  |  |
Liability for Future Policy Benefit, Other |  | 50.2 |  | 43.1 |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 2,328.2 |  | 2,348.4 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 70.0 |  | 78.0 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 2,258.2 |  | 2,270.4 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 782.8 |  | 710.2 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 45.4 |  | 42.6 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 4,641.9 |  | 4,536.2 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 1,587.2 |  | 1,335.6 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 994.4 |  | $ 854.1 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 4.10% |  | 4.10% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.10% |  | 4.90% |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 8 years 9 months 18 days |  | 8 years 10 months 24 days |  |  |
Future Policy Benefits |  | $ 2,328.2 |  | $ 2,348.4 |  |  |
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 |  | 3,553.3 |  | 3,592.6 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 3,793.8 |  | 3,754.3 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  | 0.7 |  | (7.9) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (35.8) | (57.0)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 3,758.7 | 3,689.4
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 426.7 |  | 417.2 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 105.8 |  | 101.4 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (462.1) |  | (455.5) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 3,829.1 |  | 3,752.5 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | (136.8) |  | (105.6) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 3,692.3 |  | 3,646.9 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 5,434.9 |  | 5,566.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 6,026.2 |  | 5,925.2 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  | (7.6) |  | (52.7) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (50.2) | (84.2)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 5,968.4 | 5,788.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 461.2 |  | 455.1 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 177.3 |  | 172.2 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (480.4) |  | (458.4) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 6,126.5 |  | 5,957.2 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (432.1) |  | (303.5) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 5,694.4 |  | 5,653.7 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 2,002.1 |  | 2,006.8 |  |  |
Liability for Future Policy Benefit, Other |  | 25.3 |  | 25.1 |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 2,027.4 |  | 2,031.9 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 1.2 |  | 1.5 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 2,026.2 |  | 2,030.4 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 1,329.8 |  | 1,286.4 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 71.5 |  | 70.8 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 10,893.9 |  | 10,242.2 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 13,078.5 |  | 12,450.4 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 9,268.7 |  | $ 8,948.9 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 4.40% |  | 4.40% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.20% |  | 4.80% |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 17 years 7 months 6 days |  | 17 years 3 months 18 days |  |  |
Future Policy Benefits |  | $ 2,027.4 |  | $ 2,031.9 |  |  |
Closed Block |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | 7,658.5 |  | 8,123.5 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 7,592.9 |  | 7,703.6 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | 255.3 | 145.5
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (113.6) | (32.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 7,734.6 | 7,816.5
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 293.8 |  | 302.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (474.0) |  | (462.3) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 7,554.4 |  | 7,656.2 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | 283.6 |  | 477.5 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 7,838.0 |  | 8,133.7 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 30,063.6 |  | 32,577.7 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 30,544.7 |  | 30,743.9 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | 971.3 | 1.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (51.7) | 44.1
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 31,464.3 | 30,789.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 70.3 |  | 82.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 1,158.2 |  | 1,161.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (1,462.5) |  | (1,448.6) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 31,230.3 |  | 30,584.3 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | 397.6 |  | 1,798.1 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 31,627.9 |  | 32,382.4 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 23,789.9 |  | 24,248.7 |  |  |
Liability for Future Policy Benefit, Other |  | 1,433.7 |  | 1,555.8 |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 25,223.6 |  | 25,804.5 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 9,942.3 |  | 7,175.6 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 15,281.3 |  | 18,628.9 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 650.2 |  | 665.2 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 864.4 |  | 859.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 69,916.1 |  | 71,620.4 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 12,779.0 |  | 13,968.7 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 7,743.2 |  | $ 8,103.6 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 5.30% |  | 5.20% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.30% |  | 4.90% |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 12 years 6 months |  | 13 years |  |  |
Future Policy Benefits | [2] | $ 25,223.6 |  | $ 25,804.5 |  |  |
Other Products [Member] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Future Policy Benefits | [2] | 196.2 |  | 232.8 |  |  |
Group Disability | Unum US |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | 0.0 | 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | 0.0 | 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 0.0 | 0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 0.0 |  | 0.0 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 4,735.8 |  | 5,147.4 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 4,907.5 |  | 5,277.1 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | (93.0) | (76.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (57.8) | (152.4)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 4,756.7 | 5,048.3
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 886.7 | [4] | 893.7 | [5] |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 110.0 |  | 121.7 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (1,076.0) |  | (1,109.7) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 4,677.4 |  | 4,954.0 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (72.5) |  | (43.4) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 4,604.9 |  | 4,910.6 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 4,604.9 |  | 4,910.6 |  |  |
Liability for Future Policy Benefit, Other |  | 0.2 |  | 0.1 |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 4,605.1 |  | 4,910.7 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 25.2 |  | 26.8 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 4,579.9 |  | 4,883.9 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 2,362.1 |  | 2,294.8 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 110.0 |  | 121.7 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 5,649.5 |  | 6,001.5 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 0.0 |  | $ 0.0 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 4.30% |  | 4.10% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 4.40% |  | 4.30% |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 4 years |  | 4 years 2 months 12 days |  |  |
Group Life and AD&D | Unum US |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 0.0 |  | $ 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | 0.0 | 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | 0.0 | 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 0.0 | 0.0
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 0.0 |  | 0.0 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 835.2 |  | 922.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 852.6 |  | 936.5 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | (7.1) | (17.0)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (32.7) | (49.7)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 812.8 | 869.8
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 328.8 | [4] | 333.3 | [5] |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 13.0 |  | 14.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (342.0) |  | (357.8) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 812.6 |  | 859.6 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (6.8) |  | (6.3) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 805.8 |  | 853.3 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 805.8 |  | 853.3 |  |  |
Liability for Future Policy Benefit, Other |  | 0.8 |  | 0.8 |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 806.6 |  | 854.1 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 7.3 |  | 5.7 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 799.3 |  | 848.4 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 1,574.1 |  | 1,496.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 13.0 |  | 14.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 920.6 |  | 977.0 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 0.0 |  | $ 0.0 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 2.40% |  | 2.30% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 2.50% |  | 2.40% |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 2 years 4 months 24 days |  | 2 years 6 months |  |  |
Individual Disability | Unum US |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 1,202.5 |  | $ 1,296.7 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 1,230.7 |  | 1,294.4 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | (56.9) | (100.2)
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (27.6) | (5.3)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 1,146.2 | 1,188.9
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 164.2 |  | 119.2 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 37.4 |  | 39.8 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (133.3) |  | (138.7) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 1,214.5 |  | 1,209.2 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | 5.7 |  | 16.7 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 1,220.2 |  | 1,225.9 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 3,096.5 |  | 3,348.6 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 3,191.1 |  | 3,313.9 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | (91.8) | (155.4)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (35.7) | (18.9)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 3,063.6 | 3,139.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 176.2 |  | 127.1 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 108.6 |  | 113.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (217.0) |  | (207.2) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 3,131.4 |  | 3,172.8 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | 3.8 |  | 65.8 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 3,135.2 |  | 3,238.6 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 1,915.0 |  | 2,012.7 |  |  |
Liability for Future Policy Benefit, Other |  | 26.4 |  | 28.1 |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 1,941.4 |  | 2,040.8 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 375.7 |  | 154.6 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 1,565.7 |  | 1,886.2 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 509.5 |  | 494.2 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 71.2 |  | 73.5 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 5,035.1 |  | 5,082.2 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 5,811.6 |  | 5,817.0 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 4,192.0 |  | $ 4,180.2 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 5.20% |  | 5.10% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 4.90% |  | 4.60% |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 9 years 4 months 24 days |  | 9 years 4 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 |  | $ 1,240.2 |  | $ 1,134.7 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 1,335.3 |  | 1,192.5 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | (29.6) | 41.5
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (57.3) | (72.1)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 1,248.4 | 1,161.9
Liability for Future Policy Benefit, Expected Net Premium, Issuance |  | 323.6 |  | 295.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 35.1 |  | 29.9 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (164.7) |  | (144.9) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 1,442.4 |  | 1,341.9 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | (55.1) |  | (41.7) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 1,387.3 |  | 1,300.2 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 2,362.5 |  | 2,334.5 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 2,614.6 |  | 2,422.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | (40.8) | 51.6
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (56.7) | (81.1)
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 2,517.1 | 2,392.5
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 344.8 |  | 315.1 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 80.8 |  | 73.2 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (203.2) |  | (170.3) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 2,739.5 |  | 2,610.5 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (183.0) |  | (91.7) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 2,556.5 |  | 2,518.8 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 1,169.2 |  | 1,218.6 |  |  |
Liability for Future Policy Benefit, Other |  | 3.0 |  | 2.7 |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 1,172.2 |  | 1,221.3 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 13.0 |  | 13.7 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 1,159.2 |  | 1,207.6 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 658.2 |  | 621.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 45.7 |  | 43.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 5,815.1 |  | 5,579.6 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 6,200.9 |  | 5,822.4 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 4,004.1 |  | $ 3,854.6 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 5.00% |  | 5.00% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.40% |  | 4.90% |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 18 years 1 month 6 days |  | 18 years 6 months |  |  |
Other Insurance Product Line | Closed Block |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 0.0 |  | $ 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | 0.0 | 0.0
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | 0.0 | 0.0
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 0.0 | 0.0
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 0.0 |  | 0.0 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 7,138.4 |  | 7,880.0 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 7,591.0 |  | 8,094.6 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | (3.3) | 5.4
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (25.1) | 5.2
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 7,562.6 | 8,105.2
Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance |  | 70.3 | [6] | 82.3 | [7] |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 244.8 |  | 261.6 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (677.7) |  | (738.6) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 7,200.0 |  | 7,710.5 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | (253.0) |  | (129.2) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 6,947.0 |  | 7,581.3 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 6,947.0 |  | 7,581.3 |  |  |
Liability for Future Policy Benefit, Other |  | 1,429.0 | [8] | 1,556.5 | [9] |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 8,376.0 |  | 9,137.8 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 6,553.6 |  | 7,171.4 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 1,822.4 |  | 1,966.4 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 121.2 |  | 143.6 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  |  |  | 261.6 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 10,468.0 |  | 11,281.4 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 0.0 |  | 0.0 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 0.0 |  | $ 0.0 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 4.60% |  | 4.60% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.00% |  | 4.70% |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 7 years 1 month 6 days |  | 7 years 2 months 12 days |  |  |
Long-term Care | Closed Block |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change, balance beginning of year |  | $ 7,658.5 |  | $ 8,123.5 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at beginning of period |  | 7,592.9 |  | 7,703.6 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | 255.3 | 145.5
Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (113.6) | (32.6)
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | 7,734.6 | 7,816.5
Liability for Future Policy Benefit, Expected Net Premium, Interest Income |  | 293.8 |  | 302.0 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected |  | (474.0) |  | (462.3) |  |  |
Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Cash Flow and Reinsurance, balance at end of period |  | 7,554.4 |  | 7,656.2 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax |  | 283.6 |  | 477.5 |  |  |
Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change |  | 7,838.0 |  | 8,133.7 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, beginning of year |  | 22,925.2 |  | 24,697.7 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, beginning of period |  | 22,953.7 |  | 22,649.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  |  |  | 974.6 | (4.1)
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience |  |  |  |  |  | (26.6) | 38.9
Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change |  |  |  |  |  | $ 23,901.7 | $ 22,684.1
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 |  | 913.4 |  | 899.7 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment |  | (784.8) |  | (710.0) |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Original Discount Rate, before Cash Flow and Reinsurance, end of period |  | 24,030.3 |  | 22,873.8 |  |  |
AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax |  | 650.6 |  | 1,927.3 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change, end of year |  | 24,680.9 |  | 24,801.1 |  |  |
Liability for Future Policy Benefit, before Reinsurance, before Other |  | 16,842.9 |  | 16,667.4 |  |  |
Liability for Future Policy Benefit, Other |  | 4.7 |  | (0.7) |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 16,847.6 |  | 16,666.7 |  |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 3,388.7 |  | 4.2 |  |  |
Liability for Future Policy Benefit, after Reinsurance |  | 13,458.9 |  | 16,662.5 |  |  |
Liability for Future Policy Benefit, Gross Premium Income |  | 529.0 |  | 521.6 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense |  | 619.6 |  | 597.7 |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance |  | 59,448.1 |  | 60,339.0 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance |  | 12,779.0 |  | 13,968.7 |  |  |
Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance |  | $ 7,743.2 |  | $ 8,103.6 |  |  |
Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate |  | 5.60% |  | 5.60% |  |  |
Liability for Future Policy Benefit, Current Weighted-Average Discount Rate |  | 5.40% |  | 5.00% |  |  |
Liability for Future Policy Benefit, Weighted-Average Duration |  | 14 years 10 months 24 days |  | 15 years 10 months 24 days |  |  |
Liability for Future Policy Benefit, Adverse Development, Expense |  | $ 425.6 |  | $ (70.8) |  |  |
Cancer and Critical Illness Colonial | Colonial Life |  |  |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit [Roll Forward] |  |  |  |  |  |  |
Liability for Future Policy Benefit, Adverse Development, Expense |  | $ 10.9 |  |  |  |  |
[1] | 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.
[2] | 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.
[3] | 1 Issuances for Unum International primarily represent new claim incurrals.
[4] | 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.
[5] | 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.
[6] | 1 Issuances for Closed Block - All Other represents new claim incurrals.
[7] | 1 Issuances for Closed Block - All Other represents new claim incurrals.
[8] | 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.
[9] | 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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