Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Mar. 31, 2022

Retirement Benefits [Abstract]

Schedule of components of the net periodic pension (income) expense

The components of the net periodic pension (income) expense related to the Company's pension and other postretirement benefits for the three and nine months ended March 31, 2022 and 2021 were as follows:

Three months ended March 31,	Pension Plans				Other Postretirement Plans
($ in millions)	2022		2021		2022		2021
Service cost	$	2.1	$	2.4	$	0.6	$	0.7
Interest cost	9.1		9.8		1.8		1.9
Expected return on plan assets	(14.9)		(14.1)		(2.0)		(1.6)
Amortization of net loss (gain)	2.1		3.8		(0.2)		0.9
Amortization of prior service cost (credits)	0.6		0.5		(1.0)		(1.0)
Settlement charge	—		8.9		—		—
Net pension (income) expense	$	(1.0)	$	11.3	$	(0.8)	$	0.9

Nine months ended March 31,	Pension Plans				Other Postretirement Plans
($ in millions)	2022		2021		2022		2021
Service cost	$	6.6	$	7.2	$	1.6	$	2.0
Interest cost	27.3		29.6		5.4		5.8
Expected return on plan assets	(45.0)		(41.9)		(5.9)		(4.8)
Amortization of net loss (gain)	6.3		12.4		(0.6)		2.7
Amortization of prior service cost (credits)	1.8		1.5		(3.0)		(3.1)
Settlement charge	—		8.9		—		—
Net pension (income) expense	$	(3.0)	$	17.7	$	(2.5)	$	2.6