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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory, Net [Abstract]  
Schedule of Inventories
Inventories were comprised of the following at the end of each period: 
December 31,
2021
December 25,
2020
Raw materials
$59.8 $58.1 
Work in process
196.4 200.7
Finished goods
91.0 86.1
Inventories
$347.2 $344.9