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Inventories (Tables)
9 Months Ended
Sep. 26, 2020
Inventory Disclosure [Abstract]  
Schedule of inventories
(dollars in millions)
As of
September 26,
2020
As of
December 28, 2019
Raw materials and supplies$126.9 $118.9 
Work in progress35.9 33.6 
Finished goods323.6 322.6 
Total inventories$486.4 $475.1