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Derivatives (Tables) | 9 Months Ended
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Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location | The following table presents the Company’s Ultra-Long Treasury Futures derivatives, primary underlying risk exposure, gross notional amount, and estimated fair value of these derivatives:
|  |  |  | September 30, 2025 |  | December 31, 2024
(Dollars in Millions) |  |  |  | Estimated Fair Value |  |  |  | Estimated Fair Value
Derivative Instrument |  | Primary Underlying Risk Exposure |  | Gross Notional Amount |  | Assets |  | Liabilities |  | Gross Notional Amount |  | Assets |  | Liabilities
Derivatives Designated as Hedging Instruments:
Treasury Futures |  | Interest Rate Risk |  | $ | 75.0 |  |  | $ | 2.7 |  |  | $ | — |  |  | $ | 75.0 |  |  | $ | — |  |  | $ | (3.7) |
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) | The below table reflects the amounts of Gains (Losses) deferred into AOCI before taxes, net changes in amounts in AOCI associated with current hedging transactions, and amounts subsequently reclassified into Net (Loss) Income through Net Investment Income for Ultra-Long Treasury Futures qualifying as cash flow hedges for the three and nine months ended September 30, 2025 and 2024.
|  | Three Months Ended |  | Nine Months Ended
(Dollars in Millions) |  | Sep 30, 2025 |  | Sep 30, 2024 |  | Sep 30, 2025 |  | Sep 30, 2024
Beginning of Period |  | $ | (5.7) |  |  | $ | (3.6) |  |  | $ | (6.3) |  |  | $ | — |
Gains (Losses) Deferred in AOCI |  | 0.2 |  |  | — |  |  | (1.7) |  |  | (4.0) |
Net Change in AOCI with Current Period Hedging Transactions |  | 0.6 |  |  | 3.9 |  |  | 2.9 |  |  | 4.3 |
Losses Reclassified into Income |  | — |  |  | 0.5 |  |  | 0.2 |  |  | 0.5 |
Net Comprehensive (Losses) Gains from Cash Flow Hedges |  | $ | (4.9) |  |  | $ | 0.8 |  |  | $ | (4.9) |  |  | $ | 0.8 |

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- Definition Tabular disclosure of gain (loss) on derivative and nonderivative instruments designated and qualifying as cash flow hedge recorded in accumulated other comprehensive income (AOCI) and reclassified into earnings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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- Definition Tabular disclosure of derivative instruments (including nonderivative instruments that are designated and qualify as hedging instruments) of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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