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Inventoried Costs (Tables)
 9 Months Ended
Sep. 28, 2014
Inventory Disclosure [Abstract]  
Schedule of inventoried costs
Inventoried costs consisted of the following components (in millions):
 
 
December 29,
2013
 
September 28,
2014
Raw materials
$
44.5

 
$
43.4

Work in process
24.3

 
32.1

Finished goods
4.6

 
4.4

Supplies and other
1.9

 
2.4

Subtotal inventoried costs
75.3

 
82.3

Less: Customer advances and progress payments
(0.7
)
 
(1.9
)
Total inventoried costs
$
74.6

 
$
80.4