Derivative Instruments and Hedging Activities (Tables)

6 Months Ended

Jun. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location

The following table presents the derivative instruments, primary underlying risk exposure, gross notional amount, and fair value of the Company’s derivatives:

		June 30, 2023						December 31, 2022
(Dollars in Millions)				Fair Value						Fair Value
Derivative Instrument	Primary Underlying Risk Exposure	Gross Notional Amount		Assets		Liabilities		Gross Notional Amount		Assets		Liabilities
Derivatives Designated as Hedging Instruments:
Interest Swap Lock	Interest Rate Risk	$	—	$	—	$	—	$	5.0	$	—	$	0.4
Derivatives Not Designated or Not Qualifying as Hedging Instruments:
Treasury Futures	Interest Rate Risk	$	201.5	$	3.2	$	—	$	—	$	—	$	—
Reverse Treasury Lock	Interest Rate Risk	$	—	$	—	$	—	$	100.0	$	1.7	$	—