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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Tables) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Statement of Comprehensive Income [Abstract] |  |  |  |
Schedule of Comprehensive Income | The tables below display the changes in Accumulated Other Comprehensive Loss by component for the three months ended June 30, 2023 and 2022.
(Dollars in Millions) |  | Net Unrealized Losses on Other Investments |  | Net Unrealized Losses on Investments with an Allowance for Credit Losses |  | Net Unrecognized Postretirement Benefit Costs |  | Gain on Cash Flow Hedge |  | Change in Discount Rate on Future Life Policyholder Benefits |  | Total
Balance as of March 31, 2023 |  | $ | (572.0) |  |  | $ | (2.2) |  |  | $ | (37.6) |  |  | $ | 2.7 |  |  | $ | 154.4 |  |  | $ | (454.7) |
Other Comprehensive (Loss) Income Before Reclassifications |  | (72.1) |  |  | — |  |  | — |  |  | — |  |  | 40.0 |  |  | (32.1) |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax (Expense) Benefit of $(1.8), $0.0, $0.4, $(0.1), $0.0 and $(1.5) |  | 6.5 |  |  | (0.1) |  |  | (0.4) |  |  | — |  |  | — |  |  | 6.0 |
Other Comprehensive (Loss) Income Net of Tax Benefit (Expense) of $19.4, $0.0, $0.0, $0.0, $(10.6), and $8.8 |  | (65.6) |  |  | (0.1) |  |  | (0.4) |  |  | — |  |  | 40.0 |  |  | (26.1) |
Balance as of June 30, 2023 |  | $ | (637.6) |  |  | $ | (2.3) |  |  | $ | (38.0) |  |  | $ | 2.7 |  |  | $ | 194.4 |  |  | $ | (480.8) |
(Dollars in Millions) |  | Net Unrealized Losses on Other Investments |  | Net Unrealized Losses on Investments with an Allowance for Credit Losses |  | Net Unrecognized Postretirement Benefit Costs |  | Gain on Cash Flow Hedge |  | Change in Discount Rate on Future Life Policyholder Benefits |  | Total
Balance as of March 31, 2022 |  | $ | (3.5) |  |  | $ | (9.5) |  |  | $ | (52.1) |  |  | $ | 2.8 |  |  | $ | (405.5) |  |  | $ | (467.8) |
Other Comprehensive (Loss) Income Before Reclassifications |  | (456.9) |  |  | 5.4 |  |  | — |  |  | — |  |  | 416.9 |  |  | (34.6) |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax Benefit of $1.7, $0.0,$0.0, $0.0, $0.0, and $1.7 |  | (6.9) |  |  | — |  |  | (0.1) |  |  | — |  |  | — |  |  | (7.0) |
Other Comprehensive (Loss) Income Net of Tax Benefit (Expense) of $123.4, $(1.5), $0.0, $0.0 $(110.8) and $11.1 |  | (463.8) |  |  | 5.4 |  |  | (0.1) |  |  | — |  |  | 416.9 |  |  | (41.6) |
Balance as of June 30, 2022 |  | $ | (467.3) |  |  | $ | (4.1) |  |  | $ | (52.2) |  |  | $ | 2.8 |  |  | $ | 11.4 |  |  | $ | (509.4) |
| The tables below display the changes in Accumulated Other Comprehensive Loss by component for the six months ended June 30, 2023 and 2022.
(Dollars in Millions) |  | Net Unrealized Losses on Other Investments |  | Net Unrealized Losses on Investments with an Allowance for Credit Losses |  | Net Unrecognized Postretirement Benefit Costs |  | Gain on Cash Flow Hedge |  | Change in Discount Rate on Future Life Policyholder Benefits |  | Total
Balance as of January 1, 2023 |  | $ | (719.4) |  |  | $ | (2.2) |  |  | $ | (37.2) |  |  | $ | 2.8 |  |  | $ | 241.1 |  |  | (514.9) |
Other Comprehensive Income (Loss) Before Reclassifications |  | 75.4 |  |  | 1.4 |  |  | — |  |  | — |  |  | (46.7) |  |  | 30.1 |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax (Expense) Benefit of $(1.8), $0.4, $0.3, $0.0, $0.0 and $(1.1) |  | 6.4 |  |  | (1.5) |  |  | (0.8) |  |  | (0.1) |  |  | — |  |  | 4.0 |
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $(20.4), $(0.4), $0.0, $0.0, $12.5, and $(8.3) |  | 81.8 |  |  | (0.1) |  |  | (0.8) |  |  | (0.1) |  |  | (46.7) |  |  | 34.1 |
Balance as of June 30, 2023 |  | $ | (637.6) |  |  | $ | (2.3) |  |  | $ | (38.0) |  |  | $ | 2.7 |  |  | $ | 194.4 |  |  | $ | (480.8) |
(Dollars in Millions) |  | Net Unrealized Gains (Losses) on Other Investments |  | Net Unrealized Losses on Investments with an Allowance for Credit Losses |  | Net Unrecognized Postretirement Benefit Costs |  | (Loss) Gain on Cash Flow Hedge |  | Change in Discount Rate on Future Life Policyholder Benefits |  | Total
Balance as of January 1, 2022 |  | $ | 505.8 |  |  | $ | (3.7) |  |  | $ | (52.1) |  |  | $ | (1.9) |  |  | $ | (849.7) |  |  | $ | (401.6) |
Other Comprehensive (Loss) Income Before Reclassifications |  | (972.0) |  |  | (0.4) |  |  | — |  |  | 4.7 |  |  | 861.1 |  |  | (106.6) |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax Benefit of $0.2, $0.0, $0.0, $0.0, $0.0 and $0.2 |  | (1.1) |  |  | — |  |  | (0.1) |  |  | — |  |  | — |  |  | (1.2) |
Other Comprehensive (Loss) Income Net of Tax Benefit (Expense) of $258.6, $0.1, $0.0, $(1.2), $(228.9), and $28.6 |  | (973.1) |  |  | (0.4) |  |  | (0.1) |  |  | 4.7 |  |  | 861.1 |  |  | (107.8) |
Balance as of June 30, 2022 |  | $ | (467.3) |  |  | $ | (4.1) |  |  | $ | (52.2) |  |  | $ | 2.8 |  |  | $ | 11.4 |  |  | $ | (509.4) |

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-1 + Details
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- References No definition available. + Details
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