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Inventories
9 Months Ended
Sep. 25, 2020
Inventory, Net [Abstract]  
Inventories
6.Inventories
Inventories were comprised of the following at the end of each period: 
September 25,
2020
December 27,
2019
Raw materials and supplies$52.6 $62.7 
Work in process204.9166.5
Finished goods85.882.9
$343.3 $312.1