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Acquisitions (Details) - USD ($)
$ in Millions
9 Months Ended
Oct. 22, 2018
Feb. 21, 2018
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
Business Acquisition [Line Items]          
Asset purchase price, net of cash acquired     $ 79.0 $ 13.3  
Goodwill     $ 327.9   $ 268.7
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        
Identifiable intangible assets 11.4        
Goodwill 59.0        
Accounts payable 4.4        
Current liabilities 2.5        
Other liabilities $ 3.5        
MB CalRAM LLC          
Business Acquisition [Line Items]          
Property and equipment         2.6
Identifiable intangible assets         5.2
Goodwill         5.3
Asset purchase price   $ 13.3      
Working capital acquired         $ 0.2