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Goodwill and Other Intangible Assets, net - Schedule of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Changes in the carrying amount of goodwill by reportable segment |  |  |  |
Goodwill gross, beginning balance |  |  | $ 372.2 |
Accumulated impairment losses, beginning balance |  |  | (81.8) |
Total goodwill net, beginning balance |  |  | 290.4 |
Impairment | $ 0.0 | $ 0.0 | (52.8) | $ 0.0
Other |  |  | 3.8 |
Goodwill gross, ending balance |  |  | 376.0 |
Accumulated impairment losses, ending balance |  |  | (134.6) |
Total goodwill net, ending balance |  |  | 241.4 |
Specialty Alloy Operations |  |  |  |
Changes in the carrying amount of goodwill by reportable segment |  |  |  |
Total goodwill net, beginning balance |  |  | 195.5 |
Total goodwill net, ending balance |  |  | 195.5 |
Performance Engineered Products |  |  |  |
Changes in the carrying amount of goodwill by reportable segment |  |  |  |
Total goodwill net, beginning balance |  |  | 94.9 |
Impairment |  |  | (52.8) |
Other |  |  | 3.8 |
Accumulated impairment losses, ending balance |  |  | (134.6) |
Total goodwill net, ending balance |  |  | $ 45.9 |

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