Derivatives (Tables)

9 Months Ended

Sep. 30, 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:

		September 30, 2024						December 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	$	74.9	$	0.3	$	—	$	—	$	—	$	—
Derivatives Not Designated or Not Qualifying as Hedging Instruments:
Treasury Futures	Interest Rate Risk	$	—	$	—	$	—	$	149.7	$	14.7	$	—

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 Income (Loss) through Net

Investment Income for Ultra-Long Treasury Futures qualifying as cash flow hedges for the three and nine months ended September 30, 2024 and 2023.

	Three Months Ended				Nine Months Ended
(Dollars in Millions)	Sep 30, 2024		Sep 30, 2023		Sep 30, 2024		Sep 30, 2023
Beginning of Period	$	(3.6)	$	—	$	—	$	(0.4)
Gains (Losses) Deferred in AOCI	—		—		(4.0)		—
Net Change in AOCI with Current Period Hedging Transactions	3.9		—		4.3		—
Gains (Losses) Reclassified into Income	0.5		—		0.5		0.4
Net Comprehensive Gains (Losses) from Cash Flow Hedges	$	0.8	$	—	$	0.8	$	—