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Other Comprehensive Income and Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2025
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 September 30, 2025 and 2024.
(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 |  | Net Loss on Cash Flow Hedges |  | Change in Discount Rate on Future Life Policyholder Benefits |  | Total
Balance as of June 30, 2025 |  | $ | (631.7) |  |  | $ | (2.2) |  |  | $ | 7.6 |  |  | $ | (1.4) |  |  | $ | 370.0 |  |  | $ | (257.7) |
Other Comprehensive Income (Loss) Before Reclassifications |  | 84.7 |  |  | (5.1) |  |  | — |  |  | 0.6 |  |  | (54.0) |  |  | 26.2 |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax Expense of $0.2, $1.2, $0.0, $0.0, $0.0 and $1.4 |  | 0.7 |  |  | 4.3 |  |  | (0.5) |  |  | (0.1) |  |  | — |  |  | 4.4 |
Other Comprehensive Income (Loss) Net of Tax Expense (Benefit) of $22.4, $(0.2), $0.0, $0.2, $(14.4), and $8.0 |  | 85.4 |  |  | (0.8) |  |  | (0.5) |  |  | 0.5 |  |  | (54.0) |  |  | 30.6 |
Balance as of September 30, 2025 |  | $ | (546.3) |  |  | $ | (3.0) |  |  | $ | 7.1 |  |  | $ | (0.9) |  |  | $ | 316.0 |  |  | $ | (227.1) |
(Dollars in Millions) |  | Net Unrealized Losses on Fixed Maturities |  | Net Unrealized Losses on Investments with an Allowance for Credit Losses |  | Net Unrecognized Postretirement Benefit Costs |  | Net (Loss) Gain on Cash Flow Hedges |  | Change in Discount Rate on Future Life Policyholder Benefits |  | Total
Balance as of June 30, 2024 |  | $ | (679.6) |  |  | $ | (3.7) |  |  | $ | 8.3 |  |  | $ | (0.3) |  |  | $ | 358.0 |  |  | $ | (317.3) |
Other Comprehensive Income (Loss) Before Reclassifications |  | 226.4 |  |  | 0.2 |  |  | — |  |  | 3.5 |  |  | (165.2) |  |  | 64.9 |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax (Benefit) Expense of $0.0, $0.0,$(0.1), $0.1, $0.0, and $0.0 |  | 0.1 |  |  | — |  |  | (0.6) |  |  | 0.4 |  |  | — |  |  | (0.1) |
Other Comprehensive Income (Loss) Net of Tax Expense (Benefit) of $60.1, $(0.2), $(0.1), $1.0 $(43.9) and $16.9 |  | 226.5 |  |  | 0.2 |  |  | (0.6) |  |  | 3.9 |  |  | (165.2) |  |  | 64.8 |
Balance as of September 30, 2024 |  | $ | (453.1) |  |  | $ | (3.5) |  |  | $ | 7.7 |  |  | $ | 3.6 |  |  | $ | 192.8 |  |  | $ | (252.5) |
The tables below display the changes in Accumulated Other Comprehensive Loss by component for the nine months ended September 30, 2025 and 2024.
(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 |  | Net Loss on Cash Flow Hedges |  | Change in Discount Rate on Future Life Policyholder Benefits |  | Total
Balance as of January 1, 2025 |  | $ | (687.8) |  |  | $ | (3.2) |  |  | $ | 8.4 |  |  | $ | (2.2) |  |  | $ | 380.3 |  |  | (304.5) |
Other Comprehensive Income (Loss) Before Reclassifications |  | 140.7 |  |  | (0.3) |  |  | — |  |  | 1.4 |  |  | (64.3) |  |  | 77.5 |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax Expense (Benefit) of $0.2, $0.2, $(0.3), $0.0, $0.0 and $0.1 |  | 0.8 |  |  | 0.5 |  |  | (1.3) |  |  | (0.1) |  |  | — |  |  | (0.1) |
Other Comprehensive Income (Loss) Net of Tax Expense (Benefit) of $37.3, $0.1, $(0.3), $(0.2), $(17.1), and $19.8 |  | 141.5 |  |  | 0.2 |  |  | (1.3) |  |  | 1.3 |  |  | (64.3) |  |  | 77.4 |
Balance as of September 30, 2025 |  | $ | (546.3) |  |  | $ | (3.0) |  |  | $ | 7.1 |  |  | $ | (0.9) |  |  | $ | 316.0 |  |  | $ | (227.1) |
(Dollars in Millions) |  | Net Unrealized Losses on Fixed Maturities |  | Net Unrealized Losses on Investments with an Allowance for Credit Losses |  | Net Unrecognized Postretirement Benefit Costs |  | Net Gain on Cash Flow Hedges |  | Change in Discount Rate on Future Life Policyholder Benefits |  | Total
Balance as of January 1, 2024 |  | $ | (530.9) |  |  | $ | (2.5) |  |  | $ | 9.5 |  |  | $ | 2.5 |  |  | $ | 160.6 |  |  | $ | (360.8) |
Other Comprehensive Income (Loss) Before Reclassifications |  | 68.9 |  |  | (0.5) |  |  | — |  |  | 0.7 |  |  | 32.2 |  |  | 101.3 |
Amounts Reclassified from Accumulated Other Comprehensive Loss Net of Tax Expense (Benefit) of $2.3, $(0.2), $(0.6), $0.1, $0.0 and $1.6 |  | 8.9 |  |  | (0.5) |  |  | (1.8) |  |  | 0.4 |  |  | — |  |  | 7.0 |
Other Comprehensive Income (Loss) Net of Tax Expense (Benefit) of $20.6, $(0.7), $(0.6), $0.2, $8.6, and $28.1 |  | 77.8 |  |  | (1.0) |  |  | (1.8) |  |  | 1.1 |  |  | 32.2 |  |  | 108.3 |
Balance as of September 30, 2024 |  | $ | (453.1) |  |  | $ | (3.5) |  |  | $ | 7.7 |  |  | $ | 3.6 |  |  | $ | 192.8 |  |  | $ | (252.5) |
Amounts reclassified from Accumulated Other Comprehensive Loss shown above are reported in Net (Loss) Income as follows:
Components of AOCI | Condensed Consolidated Statements of (Loss) Income Line Item Affected by Reclassifications
Net Unrealized Losses on Fixed Maturities | Net Realized Investment Gains
Net Unrealized Losses on Investments with an Allowance for Credit Losses | Impairment Losses and Net Realized Investment Gains
Net Unrecognized Postretirement Benefit Costs | Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses, Insurance and Other Expenses, and Interest Expense
Net (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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