Pension and Other Postretirement Benefits (Tables)

9 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [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, 2017 and 2016 were as follows:

Three months ended March 31,	Pension Plans						Other Postretirement Plans
($ in millions)	2017			2016			2017			2016
Service cost	$	2.2		$	7.8		$	0.9		$	0.8
Interest cost	12.4			14.4			2.3			2.5
Expected return on plan assets	(16.6		)	(16.4		)	(1.7		)	(1.7		)
Amortization of net loss	9.5			6.8			0.8			0.7
Amortization of prior service cost (benefit)	0.5			0.1			(1.6		)	(1.6		)
Net periodic benefit costs	$	8.0		$	12.7		$	0.7		$	0.7

Nine months ended March 31,	Pension Plans						Other Postretirement Plans
($ in millions)	2017			2016			2017			2016
Service cost	$	18.1		$	23.4		$	2.8		$	2.5
Interest cost	37.8			43.2			6.9			7.7
Expected return on plan assets	(48.4		)	(49.3		)	(5.1		)	(5.2		)
Amortization of net loss	28.3			20.5			2.4			2.0
Amortization of prior service cost (benefit)	1.3			0.3			(4.9		)	(4.8		)
Curtailment charge	0.5			—			—			—
Net periodic benefit costs	$	37.6		$	38.1		$	2.1		$	2.2