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Inventoried Costs (Tables)
 9 Months Ended
Sep. 27, 2015
Inventory Disclosure [Abstract]  
Schedule of inventoried costs
Inventoried costs consisted of the following components (in millions):
 
 
December 28,
2014
 
September 27,
2015
Raw materials
$
30.1

 
$
30.4

Work in process
13.3

 
23.3

Finished goods
2.8

 
2.6

Supplies and other
2.1

 
1.6

Subtotal inventoried costs
48.3

 
57.9

Less: Customer advances and progress payments
(0.9
)
 
(3.3
)
Total inventoried costs
$
47.4

 
$
54.6