Pension Benefits and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2024

Retirement Benefits [Abstract]

Schedule of Components of Net Periodic Benefit Cost

The components of net periodic benefit cost (credit) were as follows:

	Pension Benefits
	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Dollars in millions)	2024		2023		2024		2023
Interest cost	$	0.3	$	0.2	$	0.5	$	0.5
Expected return of plan assets	(0.3)		(0.3)		(0.6)		(0.7)
Amortization of net loss (gain)	0.1		0.2		0.2		0.3
Net periodic benefit cost (credit)	$	0.1	$	0.1	$	0.1	$	—