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Goodwill and Other Intangible Assets, net - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) reporting_unit | Mar. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) reporting_unit
Goodwill [Line Items] |  |  |  |  |  |
Number of reporting units | reporting_unit |  |  |  |  |  | 4
Goodwill impairment |  | $ 0.0 | $ 0.0 | $ 52.8 | $ 0.0 |
Goodwill | $ 241.4 |  |  | 241.4 |  | $ 290.4
Accumulated goodwill impairment losses | $ 134.6 |  |  | 134.6 |  | 81.8
Impairment of intangible assets |  |  |  | $ 11.6 |  | $ 7.3
Special Alloy Operations Reporting Unit |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Percentage of goodwill | 81.00% |  |  | 81.00% |  | 67.00%
Additive Reporting Unit | Technology Based Intangible Assets and Customer Relationships |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Impairment of intangible assets | $ 0.0 |  |  | $ 4.3 |  |
Performance Engineered Products |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Number of reporting units | reporting_unit |  | 3 |  |  |  | 3
Goodwill impairment |  |  |  | 52.8 |  |
Goodwill | 45.9 |  |  | 45.9 |  | $ 94.9
Accumulated goodwill impairment losses | 134.6 |  |  | 134.6 |  |
Specialty Alloy Operations |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | $ 195.5 |  |  | $ 195.5 |  | $ 195.5

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