Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Dec. 31, 2020

Retirement Benefits [Abstract]

Schedule of components of the net periodic benefit cost

The components of the net periodic benefit cost related to the Company’s pension and other postretirement benefits for the three and six months ended December 31, 2020 and 2019 were as follows:

Three months ended December 31,	Pension Plans				Other Postretirement Plans
($ in millions)	2020		2019		2020		2019
Service cost	$	2.4	$	2.4	$	0.6	$	0.7
Interest cost	9.9		11.7		1.9		2.3
Expected return on plan assets	(13.9)		(15.5)		(1.6)		(1.8)
Amortization of net loss	4.3		3.9		0.9		0.6
Amortization of prior service cost (benefit)	0.5		0.5		(1.0)		(1.0)
Net periodic benefit costs	$	3.2	$	3.0	$	0.8	$	0.8

Six months ended December 31,	Pension Plans				Other Postretirement Plans
($ in millions)	2020		2019		2020		2019
Service cost	$	4.8	$	4.9	$	1.4	$	1.4
Interest cost	19.8		23.4		3.8		4.6
Expected return on plan assets	(27.8)		(31.1)		(3.3)		(3.6)
Amortization of net loss	8.6		7.8		1.8		1.2
Amortization of prior service cost (benefit)	1.0		1.0		(2.0)		(2.0)
Net periodic benefit costs	$	6.4	$	6.0	$	1.7	$	1.6