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Inventoried Costs
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventoried Costs Inventoried Costs
 
Inventoried costs, net of progress payments, consisted of the following components (in millions):
 
 
June 30, 2019
 
December 30, 2018
Raw materials
$
45.9

 
$
34.7

Work in process
25.5

 
10.3

Finished goods
4.1

 
1.8

Subtotal inventoried costs
75.5

 
46.8

Less: Customer advances and progress payments
(0.1
)
 
—

Total inventoried costs
$
75.4

 
$
46.8