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v3.23.2

Accounting Developments (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) $ / shares | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2023 USD ($) $ / shares | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2022 USD ($) $ / shares | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jan. 01, 2021 USD ($) | Dec. 31, 2020 USD ($)
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ (3,457.6) | $ (3,809.5) |  | $ (3,809.5) |  | $ (3,457.6) | $ (3,809.5) |  | $ (3,809.5) |  | $ (3,162.3) | $ (3,448.3) |  | $ (4,438.5) | $ (5,164.6) | $ 4,166.0 |  |
Deferred Acquisition Costs |  | 2,647.2 | 2,493.3 |  | 2,493.3 |  | 2,647.2 | 2,493.3 |  | 2,493.3 |  |  | 2,560.0 |  |  |  | 2,357.7 |  |
Reinsurance Recoverable |  | 9,383.1 | 10,110.9 |  | 10,110.9 |  | 9,383.1 | 10,110.9 |  | 10,110.9 |  |  | 9,608.0 |  |  |  |  |  |
Deferred Income Tax |  | 582.9 | 686.7 |  | 686.7 |  | 582.9 | 686.7 |  | 686.7 |  |  | 586.0 |  |  |  |  |  |
Other Assets |  | 1,656.4 | 1,684.0 | [1] | 1,684.0 | [1] | 1,656.4 | 1,684.0 | [1] | 1,684.0 | [1] |  | 1,666.6 |  |  |  |  |  |
Total Assets |  | 61,904.4 | 63,510.1 |  | 63,510.1 |  | 61,904.4 | 63,510.1 |  | 63,510.1 |  |  | 61,148.5 |  |  |  |  |  |
Policy and Contract Benefits |  |  | 0.0 | [2] | 0.0 | [2] |  | 0.0 | [2] | 0.0 | [2] |  | 0.0 | [3] |  |  |  |  |
Reserves for Future Policy and Contract Benefits |  |  | 0.0 | [2] | 0.0 | [2] |  | 0.0 | [2] | 0.0 | [2] |  | 0.0 | [3] |  |  |  |  |
Future Policy Benefits |  | 38,945.3 | 41,407.7 | [2] | 41,407.7 | [2] | 38,945.3 | 41,407.7 | [2] | 41,407.7 | [2] |  | 38,577.1 | [3] |  |  |  |  |
Policyholders' Account Balances |  | 5,692.4 | 5,758.7 | [2] | 5,758.7 | [2] | 5,692.4 | 5,758.7 | [2] | 5,758.7 | [2] |  | 5,740.2 | [3] |  |  |  |  |
Unearned Premiums |  | 494.7 | 449.9 |  | 449.9 |  | 494.7 | 449.9 |  | 449.9 |  |  | 365.5 |  |  |  |  |  |
Deferred Income Tax |  | 23.9 | 36.7 |  | 36.7 |  | 23.9 | 36.7 |  | 36.7 |  |  | 25.2 |  |  |  |  |  |
Liabilities |  | 52,658.5 | 55,722.3 |  | 55,722.3 |  | 52,658.5 | 55,722.3 |  | 55,722.3 |  |  | 52,413.5 |  |  |  |  |  |
Accumulated Other Comprehensive Loss |  | (3,457.6) | (3,809.5) |  | (3,809.5) |  | (3,457.6) | (3,809.5) |  | (3,809.5) |  |  | (3,448.3) |  | (4,438.5) | (5,164.6) |  |  |
Retained Earnings |  | 13,758.1 | 12,473.7 |  | 12,473.7 |  | 13,758.1 | 12,473.7 |  | 12,473.7 |  |  | 13,141.3 |  | 12,166.9 | 11,989.4 |  |  |
Stockholders' Equity Attributable to Parent |  | 9,245.9 | 7,787.8 |  | 7,787.8 |  | 9,245.9 | 7,787.8 |  | 7,787.8 |  |  | 8,735.0 |  |  |  |  |  |
Premium Income |  | 2,509.1 | 2,416.0 |  |  |  | 4,968.4 | 4,817.4 |  |  |  |  |  |  |  |  |  |  |
Policy Benefits |  | 1,837.9 | 1,865.7 |  |  |  | 3,720.0 | 3,848.7 |  |  |  |  |  |  |  |  |  |  |
Policy Benefits - Remeasurement Gain |  | (84.3) | (65.6) |  |  |  | (230.0) | (134.4) |  |  |  |  |  |  |  |  |  |  |
Amortization of Deferred Acquisition Costs |  | 113.7 | 106.5 |  |  |  | 229.6 | 210.1 |  |  |  |  |  |  |  |  |  |  |
Other Expenses |  | 273.6 | 250.0 |  |  |  | 546.8 | 490.5 |  |  |  |  |  |  |  |  |  |  |
Income Tax - Deferred |  | (23.1) | (71.7) |  |  |  | 4.3 | (99.7) |  |  |  |  |  |  |  |  |  |  |
Net Income |  | $ 392.9 | $ 367.3 |  |  |  | $ 751.2 | $ 607.7 |  |  |  |  |  |  |  |  |  |  |
Basic Earnings Per Share | $ / shares |  | $ 1.99 | $ 1.83 |  |  |  | $ 3.80 | $ 3.01 |  |  |  |  |  |  |  |  |  |  |
Diluted Earnings Per Share | $ / shares |  | $ 1.98 | $ 1.81 |  |  |  | $ 3.78 | $ 2.99 |  |  |  |  |  |  |  |  |  |  |
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance |  |  | $ 0.0 |  |  |  |  | $ 0.0 |  |  |  |  |  |  |  |  |  |  |
Change in Foreign Currency Translation Adjustment |  | $ 38.3 | (61.4) |  |  |  | $ 63.0 | (93.4) |  |  |  |  |  |  |  |  |  |  |
Comprehensive Income (Loss) |  | 97.6 | 996.3 |  |  |  | 741.9 | 1,962.8 |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) |  | (295.3) | 629.0 |  |  |  | (9.3) | 1,355.1 |  |  |  |  |  |  |  |  |  |  |
Change in Receivables |  |  |  |  |  |  | 285.6 | 481.1 |  |  |  |  |  |  |  |  |  |  |
Change in Deferred Acquisition Costs |  |  |  |  |  |  | 84.6 | 69.6 |  |  |  |  |  |  |  |  |  |  |
Change in Insurance Liabilities |  |  |  |  |  |  | (194.2) | (10.9) |  |  |  |  |  |  |  |  |  |  |
Change in Income Taxes |  |  |  |  |  |  | 10.6 | 23.0 |  |  |  |  |  |  |  |  |  |  |
Amortization of the Cost of Reinsurance |  |  |  |  |  |  | 22.0 | 26.7 |  |  |  |  |  |  |  |  |  |  |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 38,704.9 | 41,191.3 |  | 41,191.3 |  | 38,704.9 | 41,191.3 |  | 41,191.3 |  |  |  |  |  |  | 55,585.4 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 7,922.9 | 8,621.9 |  | 8,621.9 |  | 7,922.9 | 8,621.9 |  | 8,621.9 |  |  |  |  |  |  | 10,496.0 | [4] |
Liability for Future Policy Benefit, after Reinsurance |  | 30,782.0 | 32,569.4 |  | 32,569.4 |  | 30,782.0 | 32,569.4 |  | 32,569.4 |  |  |  |  |  |  | 45,089.4 |  |
Deferred Acquisition Costs |  | 2,647.2 | 2,493.3 |  | 2,493.3 |  | 2,647.2 | 2,493.3 |  | 2,493.3 |  |  | 2,560.0 |  |  | 2,427.4 |  |  |
Future Policy Benefits |  | 38,945.3 | 41,407.7 |  | 41,407.7 |  | 38,945.3 | 41,407.7 |  | 41,407.7 |  |  |  |  |  |  |  |  |
Policyholders' Account Balances |  | 5,692.4 | 5,758.7 |  | 5,758.7 |  | 5,692.4 | 5,758.7 |  | 5,758.7 |  |  |  |  |  |  |  |  |
Premium Income |  | 2,509.1 | 2,416.0 |  |  |  | 4,968.4 | 4,817.4 |  |  |  |  |  |  |  |  |  |  |
Amortization of Deferred Acquisition Costs |  |  |  |  |  |  | 229.6 | 210.1 |  |  |  |  |  |  |  |  |  |  |
Unum US |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 9,496.1 | 10,339.9 |  | 10,339.9 |  | 9,496.1 | 10,339.9 |  | 10,339.9 |  |  |  |  |  |  | 12,861.4 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 242.9 | 270.8 |  | 270.8 |  | 242.9 | 270.8 |  | 270.8 |  |  |  |  |  |  | 357.7 | [4] |
Liability for Future Policy Benefit, after Reinsurance |  | 9,253.2 | 10,069.1 |  | 10,069.1 |  | 9,253.2 | 10,069.1 |  | 10,069.1 |  |  |  |  |  |  | 12,503.7 |  |
Deferred Acquisition Costs |  | 1,212.0 | 1,170.5 |  | 1,170.5 |  | 1,212.0 | 1,170.5 |  | 1,170.5 |  |  | 1,185.1 |  |  | 1,152.9 | 1,181.0 |  |
Future Policy Benefits | [5] | 9,496.1 | 10,339.9 |  | 10,339.9 |  | 9,496.1 | 10,339.9 |  | 10,339.9 |  |  |  |  |  |  |  |  |
Amortization of Deferred Acquisition Costs |  |  |  |  |  |  | 129.2 | 115.6 |  |  |  |  |  |  |  |  |  |  |
Unum US | Group Disability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 5,364.3 | 5,998.1 |  | 5,998.1 |  | 5,364.3 | 5,998.1 |  | 5,998.1 |  |  |  |  |  |  | 7,295.7 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 33.7 | 37.4 |  | 37.4 |  | 33.7 | 37.4 |  | 37.4 |  |  |  |  |  |  | 58.3 |  |
Liability for Future Policy Benefit, after Reinsurance |  | 5,330.6 | 5,960.7 |  | 5,960.7 |  | 5,330.6 | 5,960.7 |  | 5,960.7 |  |  |  |  |  |  | 7,237.4 |  |
Deferred Acquisition Costs |  | 65.5 | 62.3 |  | 62.3 |  | 65.5 | 62.3 |  | 62.3 |  |  | 61.0 |  |  | 60.9 |  |  |
Amortization of Deferred Acquisition Costs |  |  |  |  |  |  | 25.9 | 23.8 |  |  |  |  |  |  |  |  |  |  |
Unum US | Group Life and AD&D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 924.2 | 973.8 |  | 973.8 |  | 924.2 | 973.8 |  | 973.8 |  |  |  |  |  |  | 1,127.3 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 6.5 | 5.6 |  | 5.6 |  | 6.5 | 5.6 |  | 5.6 |  |  |  |  |  |  | 3.0 |  |
Liability for Future Policy Benefit, after Reinsurance |  | 917.7 | 968.2 |  | 968.2 |  | 917.7 | 968.2 |  | 968.2 |  |  |  |  |  |  | 1,124.3 |  |
Deferred Acquisition Costs |  | 49.9 | 52.3 |  | 52.3 |  | 49.9 | 52.3 |  | 52.3 |  |  | 49.3 |  |  | 53.9 |  |  |
Amortization of Deferred Acquisition Costs |  |  |  |  |  |  | 19.3 | 19.5 |  |  |  |  |  |  |  |  |  |  |
Unum US | Individual Disability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 2,031.1 | 2,131.4 |  | 2,131.4 |  | 2,031.1 | 2,131.4 |  | 2,131.4 |  |  |  |  |  |  | 2,767.7 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 190.7 | 201.8 |  | 201.8 |  | 190.7 | 201.8 |  | 201.8 |  |  |  |  |  |  | 260.6 |  |
Liability for Future Policy Benefit, after Reinsurance |  | 1,840.4 | 1,929.6 |  | 1,929.6 |  | 1,840.4 | 1,929.6 |  | 1,929.6 |  |  |  |  |  |  | 2,507.1 |  |
Deferred Acquisition Costs |  | 479.8 | 450.5 |  | 450.5 |  | 479.8 | 450.5 |  | 450.5 |  |  | 464.4 |  |  | 441.8 |  |  |
Amortization of Deferred Acquisition Costs |  |  |  |  |  |  | 26.7 | 24.3 |  |  |  |  |  |  |  |  |  |  |
Unum US | Voluntary Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 1,176.5 | 1,236.6 |  | 1,236.6 |  | 1,176.5 | 1,236.6 |  | 1,236.6 |  |  |  |  |  |  | 1,659.2 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 12.0 | 26.0 |  | 26.0 |  | 12.0 | 26.0 |  | 26.0 |  |  |  |  |  |  | 35.7 |  |
Liability for Future Policy Benefit, after Reinsurance |  | 1,164.5 | 1,210.6 |  | 1,210.6 |  | 1,164.5 | 1,210.6 |  | 1,210.6 |  |  |  |  |  |  | 1,623.5 |  |
Deferred Acquisition Costs |  | 606.4 | 597.2 |  | 597.2 |  | 606.4 | 597.2 |  | 597.2 |  |  | 601.0 |  |  | 588.6 |  |  |
Policyholders' Account Balances |  | 677.2 | 677.3 |  | 677.3 |  | 677.2 | 677.3 |  | 677.3 |  |  |  |  |  |  |  |  |
Amortization of Deferred Acquisition Costs |  |  |  |  |  |  | 52.2 | 43.6 |  |  |  |  |  |  |  |  |  |  |
Unum US | Dental and Vision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.5 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.1 |  |
Liability for Future Policy Benefit, after Reinsurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.4 |  |
Deferred Acquisition Costs |  | 10.4 | 8.2 |  | 8.2 |  | 10.4 | 8.2 |  | 8.2 |  |  | 9.4 |  |  | 7.7 |  |  |
Amortization of Deferred Acquisition Costs |  |  |  |  |  |  | 5.1 | 4.4 |  |  |  |  |  |  |  |  |  |  |
Unum US | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 15,813.2 |  |  |  |  | 15,813.2 |  |  |  |  |  | 16,356.3 |  |  |  |  |  |
Premium Income |  | 1,641.4 | 1,571.0 |  |  |  | 3,251.0 | 3,114.0 |  |  |  |  |  |  |  |  |  |  |
Unum US | Operating Segments | Voluntary Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium Income |  | 213.4 | 214.4 |  |  |  | 427.9 | 433.0 |  |  |  |  |  |  |  |  |  |  |
Unum US | Operating Segments | Dental and Vision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium Income |  | 68.1 | 68.9 |  |  |  | 137.4 | 139.5 |  |  |  |  |  |  |  |  |  |  |
Unum International |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 2,114.1 | 2,214.9 |  | 2,214.9 |  | 2,114.1 | 2,214.9 |  | 2,214.9 |  |  |  |  |  |  | 3,203.4 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 73.4 | 82.0 |  | 82.0 |  | 73.4 | 82.0 |  | 82.0 |  |  |  |  |  |  | 132.5 | [4] |
Liability for Future Policy Benefit, after Reinsurance |  | 2,040.7 | 2,132.9 |  | 2,132.9 |  | 2,040.7 | 2,132.9 |  | 2,132.9 |  |  |  |  |  |  | 3,070.9 |  |
Deferred Acquisition Costs |  | 42.9 | 34.3 |  | 34.3 |  | 42.9 | 34.3 |  | 34.3 |  |  | 37.0 |  |  | 36.4 | 32.0 |  |
Future Policy Benefits |  | 2,114.1 | 2,214.9 |  | 2,214.9 |  | 2,114.1 | 2,214.9 |  | 2,214.9 |  |  |  |  |  |  |  |  |
Amortization of Deferred Acquisition Costs |  |  |  |  |  |  | 3.7 | 4.8 |  |  |  |  |  |  |  |  |  |  |
Unum International | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 3,315.2 |  |  |  |  | 3,315.2 |  |  |  |  |  | 3,129.4 |  |  |  |  |  |
Premium Income |  | 207.9 | 179.4 |  |  |  | 396.5 | 367.2 |  |  |  |  |  |  |  |  |  |  |
Colonial Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 1,951.4 | 2,018.9 |  | 2,018.9 |  | 1,951.4 | 2,018.9 |  | 2,018.9 |  |  |  |  |  |  | 2,528.6 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 1.0 | 1.5 |  | 1.5 |  | 1.0 | 1.5 |  | 1.5 |  |  |  |  |  |  | 4.4 | [4] |
Liability for Future Policy Benefit, after Reinsurance |  | 1,950.4 | 2,017.4 |  | 2,017.4 |  | 1,950.4 | 2,017.4 |  | 2,017.4 |  |  |  |  |  |  | 2,524.2 |  |
Deferred Acquisition Costs |  | 1,392.3 | 1,288.5 |  | 1,288.5 |  | 1,392.3 | 1,288.5 |  | 1,288.5 |  |  | 1,337.9 |  |  | 1,238.1 | 1,144.7 |  |
Future Policy Benefits |  | 1,951.4 | 2,018.9 |  | 2,018.9 |  | 1,951.4 | 2,018.9 |  | 2,018.9 |  |  |  |  |  |  |  |  |
Policyholders' Account Balances |  | 867.0 | 868.3 |  | 868.3 |  | 867.0 | 868.3 |  | 868.3 |  |  |  |  |  |  |  |  |
Amortization of Deferred Acquisition Costs |  |  |  |  |  |  | 96.7 | 89.7 |  |  |  |  |  |  |  |  |  |  |
Colonial Life | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 4,674.9 |  |  |  |  | 4,674.9 |  |  |  |  |  | 4,575.0 |  |  |  |  |  |
Premium Income |  | 430.6 | 427.6 |  |  |  | 860.1 | 858.3 |  |  |  |  |  |  |  |  |  |  |
Closed Block |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 25,143.3 | 26,617.6 |  | 26,617.6 |  | 25,143.3 | 26,617.6 |  | 26,617.6 |  |  |  |  |  |  | 36,992.0 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 7,605.5 | 8,267.5 |  | 8,267.5 |  | 7,605.5 | 8,267.5 |  | 8,267.5 |  |  |  |  |  |  | 10,001.4 | [4] |
Liability for Future Policy Benefit, after Reinsurance |  | 17,537.8 | 18,350.1 |  | 18,350.1 |  | 17,537.8 | 18,350.1 |  | 18,350.1 |  |  |  |  |  |  | 26,990.6 |  |
Future Policy Benefits | [5] | 25,143.3 | 26,617.6 |  | 26,617.6 |  | 25,143.3 | 26,617.6 |  | 26,617.6 |  |  |  |  |  |  |  |  |
Closed Block | Long-term Care |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 15,450.3 | 16,049.1 |  | 16,049.1 |  | 15,450.3 | 16,049.1 |  | 16,049.1 |  |  |  |  |  |  | 22,740.9 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 5.4 | 5.7 |  | 5.7 |  | 5.4 | 5.7 |  | 5.7 |  |  |  |  |  |  | 44.4 |  |
Liability for Future Policy Benefit, after Reinsurance |  | 15,444.9 | 16,043.4 |  | 16,043.4 |  | 15,444.9 | 16,043.4 |  | 16,043.4 |  |  |  |  |  |  | 22,696.5 |  |
Closed Block | Other Insurance Product Line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  | 9,693.0 | 10,568.5 |  | 10,568.5 |  | 9,693.0 | 10,568.5 |  | 10,568.5 |  |  |  |  |  |  | 14,251.1 |  |
Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance |  | 7,600.1 | 8,261.8 |  | 8,261.8 |  | 7,600.1 | 8,261.8 |  | 8,261.8 |  |  |  |  |  |  | 9,957.0 |  |
Liability for Future Policy Benefit, after Reinsurance |  | 2,092.9 | 2,306.7 |  | 2,306.7 |  | 2,092.9 | 2,306.7 |  | 2,306.7 |  |  |  |  |  |  | 4,294.1 |  |
Policyholders' Account Balances |  | 4,148.2 | 4,213.1 |  | 4,213.1 |  | 4,148.2 | 4,213.1 |  | 4,213.1 |  |  |  |  |  |  |  |  |
Closed Block | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Assets |  | 34,309.8 |  |  |  |  | 34,309.8 |  |  |  |  |  | 33,776.6 |  |  |  |  |  |
Premium Income |  | 229.2 | 238.0 |  |  |  | 460.8 | 477.9 |  |  |  |  |  |  |  |  |  |  |
Closed Block | Operating Segments | Long-term Care |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium Income |  | 174.0 | 173.7 |  |  |  | 349.1 | 348.5 |  |  |  |  |  |  |  |  |  |  |
Closed Block | Operating Segments | Other Insurance Product Line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Premium Income |  | 55.2 | 64.3 |  |  |  | 111.7 | 129.4 |  |  |  |  |  |  |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,249.0 |  |
Stockholders' Equity Attributable to Parent |  | 13,758.1 | 12,473.7 |  | 12,473.7 |  | 13,758.1 | 12,473.7 |  | 12,473.7 |  | 13,430.4 | 13,141.3 |  | 12,166.9 | 11,989.4 |  |  |
Net Income |  | 392.9 | 367.3 |  |  |  | 751.2 | 607.7 |  |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,310.2) |  |
Stockholders' Equity Attributable to Parent |  | (3,457.6) | (3,809.5) |  | (3,809.5) |  | (3,457.6) | (3,809.5) |  | (3,809.5) |  | $ (3,162.3) | (3,448.3) |  | (4,438.5) | (5,164.6) |  |  |
Other Comprehensive Income (Loss) |  | $ (295.3) | 629.0 |  |  |  | $ (9.3) |  |  |  |  |  |  |  |  |  |  |  |
Previously Reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,871.0
Deferred Acquisition Costs |  |  | 2,247.6 |  | 2,247.6 |  |  | 2,247.6 |  | 2,247.6 |  |  | 2,252.3 |  |  |  |  |  | 2,272.6
Reinsurance Recoverable |  |  | 10,377.7 |  | 10,377.7 |  |  | 10,377.7 |  | 10,377.7 |  |  | 10,218.6 |  |  |  |  |  |
Deferred Income Tax |  |  | 149.9 |  | 149.9 |  |  | 149.9 |  | 149.9 |  |  | 449.8 |  |  |  |  |  |
Other Assets |  |  | 1,810.7 | [1] | 1,810.7 | [1] |  | 1,810.7 | [1] | 1,810.7 | [1] |  | 1,786.3 |  |  |  |  |  |
Total Assets |  |  | 63,121.1 |  | 63,121.1 |  |  | 63,121.1 |  | 63,121.1 |  |  | 61,434.9 |  |  |  |  |  |
Policy and Contract Benefits |  |  | 1,815.9 | [2] | 1,815.9 | [2] |  | 1,815.9 | [2] | 1,815.9 | [2] |  | 1,839.8 | [3] |  |  |  |  |
Reserves for Future Policy and Contract Benefits |  |  | 43,088.0 | [2] | 43,088.0 | [2] |  | 43,088.0 | [2] | 43,088.0 | [2] |  | 42,330.2 | [3] |  |  |  |  |
Future Policy Benefits |  |  | 0.0 | [2] | 0.0 | [2] |  | 0.0 | [2] | 0.0 | [2] |  | 0.0 | [3] |  |  |  |  |
Policyholders' Account Balances |  |  | 0.0 | [2] | 0.0 | [2] |  | 0.0 | [2] | 0.0 | [2] |  | 0.0 | [3] |  |  |  |  |
Unearned Premiums |  |  | 437.0 |  | 437.0 |  |  | 437.0 |  | 437.0 |  |  | 352.7 |  |  |  |  |  |
Deferred Income Tax |  |  | 5.8 |  | 5.8 |  |  | 5.8 |  | 5.8 |  |  | 9.2 |  |  |  |  |  |
Liabilities |  |  | 53,416.0 |  | 53,416.0 |  |  | 53,416.0 |  | 53,416.0 |  |  | 52,237.4 |  |  |  |  |  |
Accumulated Other Comprehensive Loss |  |  | (1,772.2) |  | (1,772.2) |  |  | (1,772.2) |  | (1,772.2) |  |  | (2,756.6) |  | (580.1) | 354.1 |  |  |
Retained Earnings |  |  | 12,353.7 |  | 12,353.7 |  |  | 12,353.7 |  | 12,353.7 |  |  | 12,912.1 |  | 12,043.8 | 11,853.2 |  |  |
Stockholders' Equity Attributable to Parent |  |  | 9,705.1 |  | $ 9,705.1 |  |  | 9,705.1 |  | $ 9,705.1 |  |  | 9,197.5 |  |  |  |  |  |
Premium Income |  |  | 2,417.3 |  |  |  |  | 4,820.6 |  |  |  |  |  |  |  |  |  |  |
Policy Benefits | [6] |  | 1,758.1 |  |  |  |  | 3,602.0 |  |  |  |  |  |  |  |  |  |  |
Policy Benefits - Remeasurement Gain |  |  | 0.0 |  |  |  |  | 0.0 |  |  |  |  |  |  |  |  |  |  |
Amortization of Deferred Acquisition Costs |  |  | 142.6 |  |  |  |  | 298.7 |  |  |  |  |  |  |  |  |  |  |
Other Expenses |  |  | 253.3 |  |  |  |  | 497.1 |  |  |  |  |  |  |  |  |  |  |
Income Tax - Deferred |  |  | (70.9) |  |  |  |  | (95.6) |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  | 370.4 |  |  |  |  | 623.9 |  |  |  |  |  |  |  |  |  |  |
Basic Earnings Per Share | $ / shares |  |  |  |  | $ 1.84 |  |  |  |  | $ 3.09 |  |  |  |  |  |  |  |  |
Diluted Earnings Per Share | $ / shares |  |  |  |  | $ 1.83 |  |  |  |  | $ 3.07 |  |  |  |  |  |  |  |  |
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance |  |  | 1,550.1 |  |  |  |  | 3,547.8 |  |  |  |  |  |  |  |  |  |  |
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance |  |  | 0.0 |  |  |  |  | 0.0 |  |  |  |  |  |  |  |  |  |  |
Change in Foreign Currency Translation Adjustment |  |  | (61.1) |  |  |  |  | (93.0) |  |  |  |  |  |  |  |  |  |  |
Comprehensive Income (Loss) |  |  | (821.7) |  |  |  |  | (1,502.4) |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) |  |  | (1,192.1) |  |  |  |  | (2,126.3) |  |  |  |  |  |  |  |  |  |  |
Change in Receivables |  |  |  |  |  |  |  | 469.3 |  |  |  |  |  |  |  |  |  |  |
Change in Deferred Acquisition Costs |  |  |  |  |  |  |  | 19.0 |  |  |  |  |  |  |  |  |  |  |
Change in Insurance Liabilities |  |  |  |  |  |  |  | (112.4) |  |  |  |  |  |  |  |  |  |  |
Change in Income Taxes |  |  |  |  |  |  |  | 24.9 |  |  |  |  |  |  |  |  |  |  |
Amortization of the Cost of Reinsurance |  |  |  |  |  |  |  | 33.3 |  |  |  |  |  |  |  |  |  |  |
Previously Reported | Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,704.4
Previously Reported | Unum US |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,184.6
Deferred Acquisition Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,168.7
Previously Reported | Unum US | Group Disability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,409.0
Previously Reported | Unum US | Group Life and AD&D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,123.9
Previously Reported | Unum US | Individual Disability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,485.3
Previously Reported | Unum US | Voluntary Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,154.9
Previously Reported | Unum US | Dental and Vision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.5
Previously Reported | Unum International |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,969.8
Deferred Acquisition Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 32.0
Previously Reported | Colonial Life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,977.2
Deferred Acquisition Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,071.9
Previously Reported | Closed Block |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,572.8
Previously Reported | Closed Block | Long-term Care |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,283.4
Previously Reported | Closed Block | Other Insurance Product Line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance, after Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,289.4
Previously Reported | Retained Earnings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,269.6
Previously Reported | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 374.2
Revision of Prior Period, Accounting Standards Update, Adjustment | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,705.0) |  |
Deferred Acquisition Costs |  |  | 245.7 |  | $ 245.7 |  |  | 245.7 |  | $ 245.7 |  |  | 307.7 |  |  |  |  |  |
Removal of Shadow Adjustments, DAC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.1 |  |
Reinsurance Recoverable |  |  | (266.8) |  | (266.8) |  |  | (266.8) |  | (266.8) |  |  | (610.6) |  |  |  |  |  |
Deferred Income Tax |  |  | 536.8 |  | 536.8 |  |  | 536.8 |  | 536.8 |  |  | 136.2 |  |  |  |  |  |
Other Assets |  |  | (126.7) | [1] | (126.7) | [1] |  | (126.7) | [1] | (126.7) | [1] |  | (119.7) |  |  |  |  |  |
Total Assets |  |  | 389.0 |  | 389.0 |  |  | 389.0 |  | 389.0 |  |  | (286.4) |  |  |  |  |  |
Policy and Contract Benefits |  |  | (1,815.9) | [2] | (1,815.9) | [2] |  | (1,815.9) | [2] | (1,815.9) | [2] |  | (1,839.8) | [3] |  |  |  |  |
Reserves for Future Policy and Contract Benefits |  |  | (43,088.0) | [2] | (43,088.0) | [2] |  | (43,088.0) | [2] | (43,088.0) | [2] |  | (42,330.2) | [3] |  |  |  |  |
Future Policy Benefits |  |  | 41,407.7 | [2] | 41,407.7 | [2] |  | 41,407.7 | [2] | 41,407.7 | [2] |  | 38,577.1 | [3] |  |  |  |  |
Policyholders' Account Balances |  |  | 5,758.7 | [2] | 5,758.7 | [2] |  | 5,758.7 | [2] | 5,758.7 | [2] |  | 5,740.2 | [3] |  |  |  |  |
Unearned Premiums |  |  | 12.9 |  | 12.9 |  |  | 12.9 |  | 12.9 |  |  | 12.8 |  |  |  |  |  |
Deferred Income Tax |  |  | 30.9 |  | 30.9 |  |  | 30.9 |  | 30.9 |  |  | 16.0 |  |  |  |  |  |
Liabilities |  |  | 2,306.3 |  | 2,306.3 |  |  | 2,306.3 |  | 2,306.3 |  |  | 176.1 |  |  |  |  |  |
Accumulated Other Comprehensive Loss |  |  | (2,037.3) |  | (2,037.3) |  |  | (2,037.3) |  | (2,037.3) |  |  | (691.7) |  | (3,858.4) | (5,518.7) |  |  |
Retained Earnings |  |  | 120.0 |  | 120.0 |  |  | 120.0 |  | 120.0 |  |  | 229.2 |  | $ 123.1 | $ 136.2 |  |  |
Stockholders' Equity Attributable to Parent |  |  | (1,917.3) |  | $ (1,917.3) |  |  | (1,917.3) |  | $ (1,917.3) |  |  | $ (462.5) |  |  |  |  |  |
Premium Income |  |  | (1.3) |  |  |  |  | (3.2) |  |  |  |  |  |  |  |  |  |  |
Policy Benefits | [6] |  | 107.6 |  |  |  |  | 246.7 |  |  |  |  |  |  |  |  |  |  |
Policy Benefits - Remeasurement Gain |  |  | (65.6) |  |  |  |  | (134.4) |  |  |  |  |  |  |  |  |  |  |
Amortization of Deferred Acquisition Costs |  |  | (36.1) |  |  |  |  | (88.6) |  |  |  |  |  |  |  |  |  |  |
Other Expenses |  |  | (3.3) |  |  |  |  | (6.6) |  |  |  |  |  |  |  |  |  |  |
Income Tax - Deferred |  |  | (0.8) |  |  |  |  | (4.1) |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  | (3.1) |  |  |  |  | (16.2) |  |  |  |  |  |  |  |  |  |  |
Basic Earnings Per Share | $ / shares |  |  |  |  | $ (0.01) |  |  |  |  | $ (0.08) |  |  |  |  |  |  |  |  |
Diluted Earnings Per Share | $ / shares |  |  |  |  | $ (0.02) |  |  |  |  | $ (0.08) |  |  |  |  |  |  |  |  |
Change in Adjustment to Deferred Acquisition Costs and Reserves for Future Policy and Contract Benefits, Net of Reinsurance |  |  | (1,550.1) |  |  |  |  | (3,547.8) |  |  |  |  |  |  |  |  |  |  |
Change in the Effect of Discount Rate Assumptions on the Liability for Future Policy Benefits, Net of Reinsurance |  |  | 3,371.4 |  |  |  |  | 7,029.5 |  |  |  |  |  |  |  |  |  |  |
Change in Foreign Currency Translation Adjustment |  |  | (0.3) |  |  |  |  | (0.4) |  |  |  |  |  |  |  |  |  |  |
Comprehensive Income (Loss) |  |  | 1,818.0 |  |  |  |  | 3,465.2 |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss) |  |  | $ 1,821.1 |  |  |  |  | 3,481.4 |  |  |  |  |  |  |  |  |  |  |
Change in Receivables |  |  |  |  |  |  |  | 11.8 |  |  |  |  |  |  |  |  |  |  |
Change in Deferred Acquisition Costs |  |  |  |  |  |  |  | (88.6) |  |  |  |  |  |  |  |  |  |  |
Change in Insurance Liabilities |  |  |  |  |  |  |  | 101.5 |  |  |  |  |  |  |  |  |  |  |
Change in Income Taxes |  |  |  |  |  |  |  | (1.9) |  |  |  |  |  |  |  |  |  |  |
Amortization of the Cost of Reinsurance |  |  |  |  |  |  |  | $ (6.6) |  |  |  |  |  |  |  |  |  |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Operating Segments | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (6,225.6) |  |
Adjustments for Loss Contracts | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34.9 |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 16,084.6 |  |
Other increase (decrease) | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12.9) |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,569.7) |  |
Adjustments for Loss Contracts | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,251.8 |  |
Other increase (decrease) | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5.3) |  |
Removal of Shadow Adjustments, DAC | [11] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.3 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 | Group Disability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,025.2) |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 911.9 |  |
Other increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 | Group Life and AD&D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (88.5) |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 91.9 |  |
Other increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 | Individual Disability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (446.1) |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 728.5 |  |
Other increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 | Voluntary Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (9.9) |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 519.5 |  |
Other increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5.3) |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum US | Accounting Standards Update 2018-12 | Dental and Vision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Other increase (decrease) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Unum International | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (545.8) |  |
Adjustments for Loss Contracts | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 779.4 |  |
Other increase (decrease) | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Removal of Shadow Adjustments, DAC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Colonial Life | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (44.5) |  |
Adjustments for Loss Contracts | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34.9 |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 568.6 |  |
Other increase (decrease) | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7.6) |  |
Removal of Shadow Adjustments, DAC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 72.8 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Closed Block | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB | [8] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,065.6) |  |
Adjustments for Loss Contracts | [9] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,484.8 |  |
Other increase (decrease) | [10] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Closed Block | Accounting Standards Update 2018-12 | Long-term Care |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,465.4) |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,922.9 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Closed Block | Accounting Standards Update 2018-12 | Other Insurance Product Line |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Removal of Shadow Adjustments, LFPB |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (600.2) |  |
Effect of Change in Discount Rate Assumptions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,561.9 |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Retained Earnings | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20.6) |  |
Revision of Prior Period, Accounting Standards Update, Adjustment | Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2018-12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect on Opening Balance in Period of Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (6,684.4) |  |
[1] | 1 The change in other assets is driven by the cost of reinsurance associated with the second phase of our Closed Block individual disability reinsurance transaction which was completed in the first quarter of 2021. In accordance with the provisions of the ASU related to non-contemporaneous reinsurance, we were then required to establish the ceded reserves using an upper-medium grade fixed-income instrument as of the reinsurance transaction date in March 2021 which resulted in higher ceded reserves compared to that which was reported historically.
[2] | 2 We previously reported policy and contract benefits and reserves for future policy and contract benefits liabilities in our consolidated balance sheet as of June 30, 2022 of $1,815.9 million and $43,088.0 million, respectively, resulting in total policyholder liabilities of $44,903.9 million. These balances were reclassified into new line items, future policy benefits and policyholders' account balances, which would have reported balances of $39,154.8 million and $5,749.1 million, respectively, as of June 30, 2022, resulting in total policyholder liabilities of $44,903.9 million under the historical accounting method.
[3] | 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.
[4] | 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.
[5] | 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.
[6] | 1 Previously disclosed as Benefits and Change in Reserves for Future Benefits
[7] | 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.
[8] | 2 Shadow adjustments represent the adjustments related to unrealized investment gains and losses previously included in the reserves balance prior to the adoption of ASU 2018-12.
[9] | 3 Adjustment for loss contracts represents the adjustment for those cohorts whose net premium ratio exceeded 100 percent as of the transition date. For those cohorts, the net premiums were set equal to the gross premiums and the difference was recorded as a transition adjustment to the liability for future policy benefits.
[10] | 4 This amount reflects the effect of the reclassification of certain unearned premium. This amount was reclassified to more closely align with the presentation of liabilities under ASU 2018-12 and had no impact to stockholders' equity.
[11] | 1 The $12.3 million removal of shadow adjustments is related to the Unum US voluntary benefits product line.

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