Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Mar. 31, 2023

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 nine months ended March 31, 2023 and 2022 were as follows:

Three months ended March 31,	Pension Plans				Other Postretirement Plans
($ in millions)	2023		2022		2023		2022
Service cost	$	2.0	$	2.1	$	0.5	$	0.6
Interest cost	11.5		9.1		2.4		1.8
Expected return on plan assets	(11.2)		(14.9)		(1.7)		(2.0)
Amortization of net loss (gain)	2.4		2.1		(0.4)		(0.2)
Amortization of prior service cost (credits)	0.5		0.6		(1.0)		(1.0)
Net pension expense (income)	$	5.2	$	(1.0)	$	(0.2)	$	(0.8)

Nine months ended March 31,	Pension Plans				Other Postretirement Plans
($ in millions)	2023		2022		2023		2022
Service cost	$	5.9	$	6.6	$	1.5	$	1.6
Interest cost	34.5		27.3		7.2		5.4
Expected return on plan assets	(33.6)		(45.0)		(5.1)		(5.9)
Amortization of net loss (gain)	7.2		6.3		(1.2)		(0.6)
Amortization of prior service cost (credits)	1.5		1.8		(3.0)		(3.0)
Net pension expense (income)	$	15.5	$	(3.0)	$	(0.6)	$	(2.5)