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Goodwill (Tables)
 9 Months Ended
Mar. 31, 2024
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 the nine months ended March 31, 2024 were as follows:
($ in millions)June 30, 2023ImpairmentMarch 31, 2024
Goodwill$376.0 $— $376.0 
Accumulated impairment losses(134.6)(14.1)(148.7)
Total goodwill$241.4 $(14.1)$227.3 
Specialty Alloys Operations$195.5 $— $195.5 
Performance Engineered Products45.9 (14.1)31.8 
Total goodwill$241.4 $(14.1)$227.3