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Goodwill and Other Intangible Assets, Net - Schedule of Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Changes in the carrying amount of goodwill by reportable segment |  |  |
Goodwill gross, beginning balance | $ 376.0 | $ 376.0 |
Accumulated impairment losses, beginning balance | (134.6) | (134.6) |
Total goodwill net, beginning balance | 241.4 | 241.4 |
Impairment | (14.1) | 0.0 | $ 0.0
Goodwill gross, ending balance | 376.0 | 376.0 | 376.0
Accumulated impairment losses, ending balance | (148.7) | (134.6) | (134.6)
Total goodwill net, ending balance | 227.3 | 241.4 | 241.4
Specialty Alloys Operations |  |  |
Changes in the carrying amount of goodwill by reportable segment |  |  |
Total goodwill net, beginning balance | 195.5 | 195.5 |
Impairment | 0.0 |  |
Total goodwill net, ending balance | 195.5 | 195.5 | 195.5
Performance Engineered Products |  |  |
Changes in the carrying amount of goodwill by reportable segment |  |  |
Total goodwill net, beginning balance | 45.9 | 45.9 |
Impairment | (14.1) |  |
Total goodwill net, ending balance | $ 31.8 | $ 45.9 | $ 45.9

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