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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