Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Mar. 31, 2021

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 nine months ended March 31, 2021 and 2020 were as follows:

Three months ended March 31,	Pension Plans				Other Postretirement Plans
($ in millions)	2021		2020		2021		2020
Service cost	$	2.4	$	2.4	$	0.7	$	0.7
Interest cost	9.8		11.7		1.9		2.3
Expected return on plan assets	(14.1)		(15.5)		(1.6)		(1.8)
Amortization of net loss	3.8		3.9		0.9		0.6
Amortization of prior service cost (benefit)	0.5		0.5		(1.0)		(1.0)
Settlement charge	8.9		—		—		—
Net periodic benefit costs	$	11.3	$	3.0	$	0.9	$	0.8

Nine months ended March 31,	Pension Plans				Other Postretirement Plans
($ in millions)	2021		2020		2021		2020
Service cost	$	7.2	$	7.3	$	2.0	$	2.0
Interest cost	29.6		35.1		5.8		6.8
Expected return on plan assets	(41.9)		(46.6)		(4.8)		(5.3)
Amortization of net loss	12.4		11.6		2.7		1.9
Amortization of prior service cost (benefit)	1.5		1.6		(3.1)		(2.9)
Settlement charge	8.9		—		—		—
Net periodic benefit costs	$	17.7	$	9.0	$	2.6	$	2.5