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Acquisitions and Divestiture - Narrative (Details)
$ in Millions
12 Months Ended
Feb. 21, 2018
USD ($)
Jun. 29, 2017
USD ($)
transaction
Feb. 28, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Business Acquisition [Line Items]            
Goodwill       $ 268.7 $ 263.4 $ 244.8
Proceeds from sale of business       $ 0.0 12.0 $ 0.0
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        
MB CalRAM LLC            
Business Acquisition [Line Items]            
Asset purchase price $ 13.3          
Business combination, working capital 0.2          
Business combination, property, plant, and equipment 2.6          
Identifiable intangible assets 5.2          
Goodwill $ 5.3          
Puris LLC            
Business Acquisition [Line Items]            
Asset purchase price     $ 35.3      
Business combination, working capital         1.7  
Business combination, property, plant, and equipment         6.5  
Identifiable intangible assets         8.5  
Goodwill         $ 18.6