Goodwill and Other Intangible Assets, Net (Details) - USD ($)	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Goodwill disclosures
Impairment of goodwill	$ 0	$ 0
Changes in the carrying amount of goodwill by reportable segment
Goodwill	292,100,000	292,400,000	$ 292,400,000
Accumulated impairment losses	(34,700,000)	(34,700,000)	(34,700,000)
Other, Accumulated impairment losses	0	0
Other	(300,000)	0
Total goodwill	257,400,000	257,700,000	257,700,000
Specialty Alloys Operations
Changes in the carrying amount of goodwill by reportable segment
Other	0	0
Total goodwill	195,500,000	195,500,000	195,500,000
Performance Engineered Products
Changes in the carrying amount of goodwill by reportable segment
Other	(300,000)	0
Total goodwill	$ 61,900,000	$ 62,200,000	$ 62,200,000