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SEGMENT INFORMATION - THIRD PARTY NET SALES, EXCLUDING PRECIOUS METAL CONTENT (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Revenue, Major Customer [Line Items]        
Net sales $ 946.2 $ 946.2 $ 956.1  
Technologies & Equipment        
Revenue, Major Customer [Line Items]        
Net sales 520.8   510.1  
Consumables        
Revenue, Major Customer [Line Items]        
Net sales 425.4   446.0  
Operating Segments        
Revenue, Major Customer [Line Items]        
Net sales 935.0   945.8  
Operating Segments | Technologies & Equipment        
Revenue, Major Customer [Line Items]        
Net sales 520.8 520.8 510.1 $ 510.1
Operating Segments | Consumables        
Revenue, Major Customer [Line Items]        
Net sales 414.2 $ 414.2 435.7 $ 435.7
Segment Reconciling Items        
Revenue, Major Customer [Line Items]        
Net sales $ 11.2   $ 10.3