Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Dec. 31, 2015

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 six months ended December 31, 2015 and 2014 were as follows:

Three months ended December 31,	Pension Plans						Other Postretirement Plans
($ in millions)	2015			2014			2015			2014
Service cost	$	7.8		$	8.0		$	0.8		$	1.1
Interest cost	14.4			13.5			2.5			3.0
Expected return on plan assets	(16.4		)	(17.2		)	(1.7		)	(1.7		)
Amortization of net loss	6.8			4.2			0.7			0.5
Amortization of prior service cost (benefit)	0.1			0.1			(1.6		)	—
Net periodic benefit costs	$	12.7		$	8.6		$	0.7		$	2.9

Six months ended December 31,	Pension Plans						Other Postretirement Plans
($ in millions)	2015			2014			2015			2014
Service cost	$	15.6		$	16.0		$	1.7		$	2.2
Interest cost	28.8			27.0			5.2			5.9
Expected return on plan assets	(32.9		)	(34.4		)	(3.5		)	(3.3		)
Amortization of net loss	13.7			8.4			1.4			1.0
Amortization of prior service cost (benefit)	0.2			0.2			(3.3		)	—
Net periodic benefit costs	$	25.4		$	17.2		$	1.5		$	5.8