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Other Comprehensive (Loss) Income And Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2024
Equity [Abstract] |
Schedule of Comprehensive Income (Loss) | The tables below display the changes in Accumulated Other Comprehensive Loss by component for the years ended December 31, 2024, 2023 and 2022:
(Dollars in Millions) |  | Net Unrealized Losses on Fixed Maturities |  | Net Unrealized Losses on Investments with an Allowance for Credit Losses |  | Net Unrecognized Postretirement Benefit Income (Costs) |  | (Loss) Gain on Cash Flow Hedges |  | 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 |  | (1,215.1) |  |  | 2.0 |  |  | 15.2 |  |  | 4.7 |  |  | 1,090.8 |  |  | (102.4) |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax Benefit of $2.7, $0.1, $0.1, $—. $—, and $2.9 |  | (10.1) |  |  | (0.5) |  |  | (0.3) |  |  | — |  |  |  |  | (10.9) |
Other Comprehensive Income (Loss) Net of Tax Benefit (Expense) of $325.9, $(0.4), $(4.0), $(1.2), $(289.9), and $30.4 |  | (1,225.2) |  |  | 1.5 |  |  | 14.9 |  |  | 4.7 |  |  | 1,090.8 |  |  | (113.3) |
Balance as of December 31, 2022 |  | $ | (719.4) |  |  | $ | (2.2) |  |  | $ | (37.2) |  |  | $ | 2.8 |  |  | $ | 241.1 |  |  | $ | (514.9) |
Other Comprehensive Income (Loss) Before Reclassifications |  | 185.0 |  |  | (0.3) |  |  | (6.0) |  |  | — |  |  | (80.5) |  |  | 98.2 |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax (Expense) Benefit of $(0.9), $—, $(13.8), $(0.1), $—, and $(14.8) |  | 3.5 |  |  | — |  |  | 52.7 |  |  | (0.3) |  |  | — |  |  | 55.9 |
Other Comprehensive Income (Loss) Net of Tax (Expense) Benefit of $(50.3), $0.2, $(12.5), $(0.1), $21.2 and $(41.5) |  | 188.5 |  |  | (0.3) |  |  | 46.7 |  |  | (0.3) |  |  | (80.5) |  |  | 154.1 |
Balance as of December 31, 2023 |  | $ | (530.9) |  |  | $ | (2.5) |  |  | $ | 9.5 |  |  | $ | 2.5 |  |  | $ | 160.6 |  |  | $ | (360.8) |
Other Comprehensive (Loss) Income Before Reclassifications |  | (165.8) |  |  | (0.3) |  |  | 1.4 |  |  | (5.4) |  |  | 219.7 |  |  | 49.6 |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax (Expense) Benefit of $(2.3), $0.3, $0.6, $(0.2), $—, and $(1.6) |  | 8.9 |  |  | (0.4) |  |  | (2.5) |  |  | 0.7 |  |  | — |  |  | 6.7 |
Other Comprehensive (Loss) Income Before Reclassifications Net of Tax Benefit (Expense) of $41.8, $0.6, $0.2, $0.7, $(58.3), and $(15.0) |  | (156.9) |  |  | (0.7) |  |  | (1.1) |  |  | (4.7) |  |  | 219.7 |  |  | 56.3 |
Balance as of December 31, 2024 |  | $ | (687.8) |  |  | $ | (3.2) |  |  | $ | 8.4 |  |  | $ | (2.2) |  |  | $ | 380.3 |  |  | $ | (304.5) |
Amounts reclassified from Accumulated Other Comprehensive Loss shown above are reported in Net Income (Loss) as follows:
Components of AOCI | Consolidated Statements of Income (Loss) Line Item Affected by Reclassifications
Net Unrealized Gains (Losses) on Fixed Maturities and Net Unrealized Losses on Investments with an Allowance for Credit Losses | Net Realized Investment Gains (Losses) and Impairment Losses
Net Unrecognized Postretirement Benefit Income (Costs) | Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses, Insurance and Other Expenses, and Interest Expense
(Loss) Gain on Cash Flow Hedges | Net Investment Income and Interest Expense

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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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