Goodwill Schedule of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Goodwill [Line Items]
Goodwill, Beginning Balance			$ 292.1
Impairment Losses			0.0
Other			(0.1)
Goodwill, Ending Balance	$ 292.0		292.0
Accumulated impairment losses, Beginning Balance			(34.7)
Accumulated impairment losses, Changes in Impairment Losses			(12.5)
Accumulated impairment losses, Other Changes			0.0
Accumulated impairment losses, Ending Balance	(47.2)		(47.2)
Goodwill, Beginning Balance			257.4
Goodwill impairment	12.5	$ 0.0	12.5	$ 0.0
Goodwill, Other			(0.1)
Goodwill, Ending Balance	244.8		244.8
Specialty Alloys Operations
Goodwill [Line Items]
Goodwill, Beginning Balance			195.5
Goodwill impairment			0.0
Goodwill, Other			0.0
Goodwill, Ending Balance	195.5		195.5
Performance Engineered Products
Goodwill [Line Items]
Goodwill, Beginning Balance			61.9
Goodwill impairment			12.5
Goodwill, Other			(0.1)
Goodwill, Ending Balance	$ 49.3		$ 49.3