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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventories  
Schedule of inventories
Inventories consisted of the following (dollars in millions):
 
    
September 30,
2021
    
December 31,
2020
 
Raw materials
   $ 209.9      $ 198.8  
Work-in-process
     272.5        245.7  
Finished goods
     155.9        152.1  
Demonstration units
     94.5        95.7  
    
 
 
    
 
 
 
Inventories
   $ 732.8      $ 692.3