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Inventoried Costs
 6 Months Ended
Jul. 01, 2018
Inventory Disclosure [Abstract]  
Inventoried Costs
Inventoried Costs
 
Inventoried costs consisted of the following components (in millions):
 
 
July 1,
2018
 
December 31,
2017
Raw materials
$
32.4

 
$
35.9

Work in process
14.6

 
11.4

Finished goods
2.0

 
2.3

Subtotal inventoried costs
49.0

 
49.6

Less: Customer advances and progress payments
—

 
(0.6
)
Total inventoried costs
$
49.0

 
$
49.0