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

 
$
42.4

Work in process
36.5

 
36.5

Finished goods
7.3

 
5.3

Supplies and other
2.2

 
1.8

Subtotal inventoried costs
94.4

 
86.0

Less: Customer advances and progress payments
(0.1
)
 
(0.7
)
Total inventoried costs
$
94.3

 
$
85.3