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Goodwill (Tables)
 9 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
The changes in the carrying amount of goodwill by reportable segment for the nine months ended March 31, 2017 and fiscal year 2016 were as follows:

($ in millions)
 
June 30, 2015
 
Impairment Losses
 
Other
 
June 30, 2016
 
Acquisition
 
March 31, 2017
Goodwill
 
$
292.1

 
$
—

 
$
(0.1
)
 
$
292.0

 
$
26.1

 
$
318.1

Accumulated impairment losses
 
(34.7
)
 
(12.5
)
 
—

 
(47.2
)
 
—

 
(47.2
)
Total goodwill
 
$
257.4

 
$
(12.5
)
 
$
(0.1
)
 
$
244.8

 
$
26.1

 
$
270.9

 
 
 
 
 
 
 
 
 
 
 
 
 
Specialty Alloys Operations
 
$
195.5

 
$
—

 
$
—

 
$
195.5

 
$
—

 
$
195.5

Performance Engineered Products
 
61.9

 
(12.5
)
 
(0.1
)
 
49.3

 
26.1

 
75.4

Total goodwill
 
$
257.4

 
$
(12.5
)
 
$
(0.1
)
 
$
244.8

 
$
26.1

 
$
270.9