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Acquisitions (Details) - USD ($)
$ in Millions
6 Months Ended
Oct. 22, 2018
Feb. 21, 2018
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Business Acquisition [Line Items]          
Asset purchase price, net of cash acquired     $ 79.0 $ 0.0  
Goodwill     $ 337.2   $ 268.7
LPW Technology Ltd          
Business Acquisition [Line Items]          
Asset purchase price, net of cash acquired $ 79.0        
Accounts receivable 2.1        
Inventory 4.7        
Other current assets 0.4        
Property and equipment 11.8        
Goodwill 69.8        
Accounts payable 4.4        
Current liabilities 2.9        
Other liabilities $ 2.5        
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