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Inventories
6 Months Ended
Jun. 25, 2021
Inventory, Net [Abstract]  
Inventories
7.Inventories
Inventories were comprised of the following at the end of each period: 
June 25,
2021
December 25,
2020
Raw materials and supplies$50.0 $58.1 
Work in process212.7200.7
Finished goods92.186.1
$354.8 $344.9