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Inventories
3 Months Ended
Mar. 27, 2020
Inventory, Net [Abstract]  
Inventories
6.
Inventories
Inventories were comprised of the following at the end of each period: 
 
March 27,
2020
 
December 27,
2019
Raw materials and supplies
$
56.5

 
$
62.7

Work in process
184.5

 
166.5

Finished goods
86.1

 
82.9

 
$
327.1

 
$
312.1