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Inventories
6 Months Ended
Jun. 26, 2020
Inventory, Net [Abstract]  
Inventories
6.Inventories
Inventories were comprised of the following at the end of each period: 
June 26,
2020
December 27,
2019
Raw materials and supplies$57.9  $62.7  
Work in process193.1  166.5  
Finished goods82.0  82.9  
$333.0  $312.1