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Goodwill and Other Intangible Assets, Net - Schedule of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Changes in the carrying amount of goodwill by reportable segment |  |
Goodwill gross, beginning balance | $ 315.9 | $ 310.6
Accumulated impairment losses, beginning balance | (47.2) | (47.2)
Total goodwill net, beginning balance | 268.7 | 263.4
Acquisition | 57.7 | 5.3
Goodwill gross, ending balance | 373.6 | 315.9
Accumulated impairment losses, ending balance | (47.2) | (47.2)
Total goodwill net, ending balance | 326.4 | 268.7
Specialty Alloys Operations |  |
Changes in the carrying amount of goodwill by reportable segment |  |
Total goodwill net, beginning balance | 195.5 | 195.5
Acquisition | 0.0 | 0.0
Total goodwill net, ending balance | 195.5 | 195.5
Performance Engineered Products |  |
Changes in the carrying amount of goodwill by reportable segment |  |
Total goodwill net, beginning balance | 73.2 | 67.9
Acquisition | 57.7 | 5.3
Total goodwill net, ending balance | $ 130.9 | $ 73.2

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