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Restructuring and Asset Impairment Charges - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 facility | Mar. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring and asset impairment charges | $ 5.0 |  |  | $ 0.0 | $ 15.0 | $ 2.3
Proceeds from disposals of property, plant and equipment and assets held for sale |  |  |  |  | 1.6 | 0.3
Non-cash inventory write-downs from restructuring | 2.6 |  |  | $ 0.0 | $ 2.6 | $ 0.0
Performance Engineered Products |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Asset impairment charges | 4.9 | $ 8.7 |  |  |  |
Severance costs | 0.6 | $ 1.3 |  |  |  |
Proceeds from disposals of property, plant and equipment and assets held for sale | $ 0.5 |  |  |  |  |
Fixed Cost Reduction |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of positions eliminated, period percent |  |  | 20.00% |  |  |
Facility Closing |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Number of small domestic power metals production facilities closed | facility |  |  | 2 |  |  |

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