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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Major components of inventories
The major components of inventories, on a net basis, were as follows:
December 31,
  (dollars in millions)
20202019
Finished goods$119.7 $118.5 
Work in process23.0 22.6 
Raw materials and supplies60.4 58.5 
Total inventories$203.1 $199.6