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Inventoried Costs (Tables)
 9 Months Ended
Sep. 29, 2013
Inventory Disclosure [Abstract]  
Schedule of inventoried costs
Inventoried costs consisted of the following components (in millions):
 
 
December 30,
2012
 
September 29,
2013
Raw materials
$
48.4

 
$
44.4

Work in process
36.5

 
33.3

Finished goods
7.3

 
5.0

Supplies and other
2.2

 
1.9

Subtotal inventoried costs
94.4

 
84.6

Less: Customer advances and progress payments
(0.1
)
 
(1.2
)
Total inventoried costs
$
94.3

 
$
83.4