Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Dec. 31, 2021

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 six months ended December 31, 2021 and 2020 were as follows:

Three months ended December 31,	Pension Plans				Other Postretirement Plans
($ in millions)	2021		2020		2021		2020
Service cost	$	2.1	$	2.4	$	0.6	$	0.6
Interest cost	9.1		9.9		1.8		1.9
Expected return on plan assets	(14.9)		(13.9)		(2.0)		(1.6)
Amortization of net loss (gain)	2.1		4.3		(0.2)		0.9
Amortization of prior service cost (credits)	0.6		0.5		(1.0)		(1.0)
Net pension (income) expense	$	(1.0)	$	3.2	$	(0.8)	$	0.8

Six months ended December 31,	Pension Plans				Other Postretirement Plans
($ in millions)	2021		2020		2021		2020
Service cost	$	4.2	$	4.8	$	1.3	$	1.4
Interest cost	18.2		19.8		3.5		3.8
Expected return on plan assets	(29.8)		(27.8)		(4.0)		(3.3)
Amortization of net loss (gain)	4.2		8.6		(0.4)		1.8
Amortization of prior service cost (credits)	1.2		1.0		(2.0)		(2.0)
Net pension (income) expense	$	(2.0)	$	6.4	$	(1.6)	$	1.7