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Derivatives (Tables) | 12 Months Ended
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Dec. 31, 2024
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:
|  |  |  | Dec 31, 2024 |  | Dec 31, 2023
(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 |  |  | $ | — |  |  | $ | (3.7) |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Derivatives Not Designated or Not Qualifying as Hedging Instruments:
Treasury Futures |  | Interest Rate Risk |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 149.7 |  |  | $ | 14.7 |  |  | $ | — |
Derivative Instruments, Gain (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 Income (Loss) through Net Investment Income for Ultra-Long Treasury Futures qualifying as cash flow hedges for the years ended December 31, 2024 and 2023:
|  | Year Ended
(Dollars in Millions) |  | Dec 31, 2024 |  | Dec 31, 2023
Beginning of Year |  | $ | — |  |  | $ | (0.4) |
Gains (Losses) Deferred in AOCI |  | (4.4) |  |  | — |
Net Change in AOCI with Current Period Hedging Transaction |  | (3.7) |  |  | — |
Gains (Losses) Reclassified into Income |  | 1.8 |  |  | 0.4 |
Net Comprehensive Gains (Losses) from Cash Flow Hedges |  | $ | (6.3) |  |  | $ | — |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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