Goodwill and Other Intangible Assets, Net (Tables)

12 Months Ended

Jun. 30, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of changes in carrying amount of goodwill by reportable segment

The changes in the carrying amount of goodwill by reportable segment for fiscal years 2018 and 2017 were as follows:

($ in millions)	June 30, 2016			Acquisition		June 30, 2017			Acquisition		June 30, 2018
Goodwill	$	292.0		$	18.6	$	310.6		$	5.3	$	315.9
Accumulated impairment losses	(47.2		)	—		(47.2		)	—		(47.2		)
Total goodwill	$	244.8		$	18.6	$	263.4		$	5.3	$	268.7
Specialty Alloys Operations	$	195.5		$	—	$	195.5		$	—	$	195.5
Performance Engineered Products	49.3			18.6		67.9			5.3		73.2
Total goodwill	$	244.8		$	18.6	$	263.4		$	5.3	$	268.7

Schedule of other intangible assets, net

		June 30, 2018							June 30, 2017
($ in millions)	Useful Life (in Years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Trademarks and trade names	15 - 30	$	33.5	$	(23.2	)	$	10.3	$	33.5	$	(21.9	)	$	11.6
Customer relationships	10 - 15	76.9		(30.8		)	46.1		73.3		(25.8		)	47.5
Non-compete agreements	5	0.2		(0.1		)	0.1		0.2		—			0.2
Technology	15	7.3		(0.5		)	6.8		5.7		(0.1		)	5.6
Total		$	117.9	$	(54.6	)	$	63.3	$	112.7	$	(47.8	)	$	64.9