Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Dec. 31, 2024

Retirement Benefits [Abstract]

Schedule of Components of the Net Periodic Pension (Income) Expense

The components of the net periodic pension expense (income) related to the Company's pension and other postretirement benefits for the three and six months ended December 31, 2024 and 2023 were as follows:

	Three Months Ended December 31,
	2024		2023		2024		2023
($ in millions)	Pension Plans				Other Postretirement Plans
Service cost	$	1.9	$	2.0	$	0.4	$	0.4
Interest cost	9.7		11.8		2.5		2.5
Expected return on plan assets	(7.5)		(10.1)		(2.1)		(1.8)
Amortization of net loss (gain)	1.9		2.2		(1.4)		(0.6)
Amortization of prior service cost (credits)	0.5		0.5		0.3		(1.0)
Net pension expense (income)	$	6.5	$	6.4	$	(0.3)	$	(0.5)

	Six Months Ended December 31,
	2024		2023		2024		2023
($ in millions)	Pension Plans				Other Postretirement Plans
Service cost	$	3.8	$	4.2	$	0.8	$	0.7
Interest cost	19.4		23.6		5.0		5.0
Expected return on plan assets	(15.0)		(20.2)		(4.2)		(3.7)
Amortization of net loss (gain)	3.8		4.4		(2.8)		(1.2)
Amortization of prior service cost (credits)	1.0		1.0		0.6		(2.0)
Net pension expense (income)	$	13.0	$	13.0	$	(0.6)	$	(1.2)