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Inventories
 6 Months Ended
Jun. 29, 2018
Inventory, Net [Abstract]  
Inventories
9.
Inventories
Inventories were comprised of the following at the end of each period: 
 
June 29,
2018
 
December 29,
2017
Raw materials and supplies
$
26.1

 
$
23.7

Work in process
118.1

 
61.1

Finished goods
40.2

 
43.9

 
$
184.4

 
$
128.7