Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Sep. 30, 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 months ended September 30, 2020 and 2019 were as follows:

Three months ended September 30,	Pension Plans				Other Postretirement Plans
($ in millions)	2020		2019		2020		2019
Service cost	$	2.4	$	2.4	$	0.7	$	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	$	0.9	$	0.8