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Acquisitions and Divestiture - Narrative (Details)
$ in Millions
12 Months Ended
Oct. 22, 2018
USD ($)
Feb. 21, 2018
USD ($)
Jun. 29, 2017
USD ($)
transaction
Feb. 28, 2017
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Business Acquisition [Line Items]              
Asset purchase price, net of cash acquired         $ 79.0 $ 13.3 $ 35.3
Goodwill         326.4 268.7 263.4
Proceeds from sale of business         $ 0.0 0.0 $ 12.0
Discontinued Operations, Disposed of by Sale | Specialty Steel Supply              
Business Acquisition [Line Items]              
Number of separate transactions to complete the divestiture | transaction     2        
Proceeds from sale of business     $ 12.0        
Pre tax loss from divestiture     $ 3.2        
LPW Technology Ltd              
Business Acquisition [Line Items]              
Asset purchase price, net of cash acquired $ 79.0            
Accounts receivable 2.1            
Inventory 4.5            
Other current assets 0.5            
Property and equipment 11.9            
Goodwill 59.0            
Accounts payable 4.4            
Current liabilities 2.5            
Other liabilities 3.5            
Identifiable intangible assets $ 11.4            
MB CalRAM LLC              
Business Acquisition [Line Items]              
Property and equipment   $ 2.6          
Goodwill   5.3          
Asset purchase price   13.3          
Working capital acquired   0.2          
Identifiable intangible assets   $ 5.2          
Puris LLC              
Business Acquisition [Line Items]              
Property and equipment           6.5  
Goodwill           18.6  
Asset purchase price       $ 35.3      
Working capital acquired           1.7  
Identifiable intangible assets           $ 8.5