| Fiscal period | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
| Period End Date | 12/31/2025 | 12/31/2024 | 12/31/2023 | 12/31/2022 | 12/31/2021 | 12/31/2020 | 12/31/2019 | 12/31/2018 | 12/31/2017 | 12/31/2016 |
| Insurance policy income | 2,622.60 | 2,558.50 | 2,505.50 | 2,499.80 | 2,523.40 | 2,511.30 | 2,480.80 | 2,593.10 | 2,647.30 | 2,601.10 |
| Net realized investment gains (losses) | (59.60) | (75.60) | (69.30) | (135.40) | 19.10 | (36.20) | 40.60 | (8.70) | 77.40 | 47.90 |
| Gain on dissolution of a variable interest entity | -- | -- | -- | -- | -- | -- | -- | -- | (4.30) | (7.30) |
| Net realized gains on the transfer of assets related to reinsurance transaction | -- | -- | -- | -- | -- | -- | -- | 363.40 | -- | -- |
| Net investment income (loss): General account assets | 1,542.40 | 1,419.40 | 1,250.20 | 1,179.00 | 1,140.20 | 1,079.00 | 1,105.20 | 1,279.70 | 1,285.40 | 1,204.10 |
| Net investment income (loss): Policyholder and reinsurer accounts | 181.00 | 329.40 | 249.50 | (163.10) | 280.50 | 143.50 | 257.70 | 26.50 | 265.90 | 121.10 |
| Venture capital income (loss) related to investment in AT&T Wireless Services, Inc | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Fee revenue and other income | 196.10 | 192.10 | 210.60 | 196.50 | 159.00 | 123.50 | 143.90 | 62.10 | 48.30 | 50.50 |
| Total other-than-temporary impairment losses | -- | -- | -- | -- | -- | -- | (12.40) | (2.60) | (21.90) | (35.90) |
| Other-than-temporary impairment losses recognized in other comprehensive loss | 4.90 | 25.70 | 0.30 | -- | -- | -- | -- | 0.00 | (0.90) | 3.60 |
| Total Revenues | 4,487.40 | 4,449.50 | 4,146.80 | 3,576.80 | 4,122.20 | 3,821.10 | 4,015.80 | 4,313.50 | 4,297.20 | 3,985.10 |
| Insurance policy benefits | 2,548.20 | 2,471.90 | 2,318.20 | 1,658.30 | 2,190.70 | 2,157.90 | 2,417.00 | 2,278.60 | 2,602.70 | 2,390.50 |
| Liability for future policy benefits remeasurement loss | (70.70) | (41.10) | (21.20) | -- | -- | -- | -- | -- | -- | -- |
| Change in fair value of market risk benefits | (12.40) | (60.50) | (21.30) | -- | -- | -- | -- | -- | -- | -- |
| Provision for losses | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Amortization | 278.00 | 251.20 | 227.40 | 309.60 | 281.10 | 268.10 | 232.10 | 264.30 | 239.30 | 253.30 |
| Goodwill impairment | 101.90 | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Gain on reinsurance recapture | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Other operating costs and expenses | (1,119.60) | (1,055.30) | (1,048.30) | (954.60) | (987.30) | (942.00) | (932.90) | (814.20) | (841.50) | (796.30) |
| Interest expense | 230.90 | 254.40 | 238.60 | 137.00 | 95.40 | 108.80 | 152.30 | 149.80 | 123.70 | 116.40 |
| Loss (gain) on extinguishment of debt | -- | -- | -- | -- | -- | -- | -- | -- | -- | 0.00 |
| Costs related to the tentative litigation settlement | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Reorganization items | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Gain on extinguishment of debt | 1.50 | -- | -- | -- | 0.00 | 0.00 | (7.30) | -- | -- | -- |
| Gain (Loss) related to an annuity coinsurance transaction | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Loss on sale of subsidiary | -- | -- | -- | -- | -- | -- | -- | (1,067.60) | -- | (75.40) |
| Loss on extinguishment of borrowings related to variable interest entities | -- | -- | -- | -- | -- | -- | -- | (3.80) | (9.50) | -- |
| Income (loss) before income taxes | 293.40 | 518.30 | 356.80 | 517.30 | 567.70 | 344.30 | 274.20 | (264.80) | 480.50 | 353.20 |
| Income tax expense on period income | 64.10 | 114.30 | 80.30 | 120.50 | 126.70 | 76.50 | 58.50 | (57.60) | 162.80 | 127.80 |
| Current tax expense (benefit) | 63.70 | 26.40 | 68.30 | 31.80 | 64.10 | (24.00) | 19.20 | (2.80) | 90.80 | (45.20) |
| Deferred tax provision | 0.40 | 87.90 | 12.00 | 88.70 | 62.60 | 100.50 | 39.30 | 93.10 | 72.00 | 173.00 |
| Valuation allowance for deferred tax assets | -- | -- | -- | -- | -- | (34.00) | (193.70) | 107.80 | 142.10 | (132.80) |
| Change in valuation allowance | -- | -- | -- | -- | -- | -- | (193.70) | 95.70 | (13.40) | -- |
| Valuation allowance applicable to current year income | -- | -- | -- | -- | -- | -- | -- | 8.90 | (15.30) | (14.00) |
| Tax expense related to the sale of CLIC | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Other items | -- | -- | -- | -- | -- | -- | -- | 3.20 | (1.70) | 10.90 |
| Impact of federal tax reform | -- | -- | -- | -- | -- | -- | -- | -- | 310.60 | -- |
| Change in valuation allowance related to federal tax reform | -- | -- | -- | -- | -- | -- | -- | -- | (138.10) | -- |
| Income (loss) from Continuing Operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Discontinued operations, net of income taxes | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income (loss) | 229.30 | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income before Prefered dividend and Other Adjustments | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Preferred stock dividends | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Interest expense on Debentures, net of income taxes | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income (loss) applicable to common stock | 229.30 | 404.00 | 276.50 | 396.80 | 441.00 | 301.80 | 409.40 | (315.00) | 175.60 | 358.20 |
| Net income allocated to common shares assuming dilution | -- | -- | -- | -- | -- | -- | -- | (315.00) | -- | 358.20 |
| Basic: Income (loss) from Continuing Operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Basic: Discontinued operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Basic: Net income (loss) | 2.35 | 3.81 | 2.44 | 3.43 | 3.43 | 2.12 | 2.62 | (1.90) | 1.03 | 2.03 |
| Diluted: Income (loss) from Continuing Operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Diluted: Discontinued operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Diluted: Net income (loss) | 2.30 | 3.74 | 2.40 | 3.37 | 3.36 | 2.11 | 2.61 | (1.90) | 1.02 | 2.01 |
| Basic: Weighted average shares outstanding | 97.76 | 106.14 | 113.28 | 115.73 | 128.40 | 142.10 | 156.04 | 165.46 | 170.03 | 176.64 |
| Diluted: Weighted average shares outstanding | 99.82 | 108.12 | 115.12 | 117.72 | 131.13 | 143.16 | 157.15 | 165.46 | 172.14 | 178.32 |