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Accounts Receivable (Tables)
 12 Months Ended
Dec. 29, 2013
Receivables [Abstract]  
Accounts Receivable
Accounts receivable are summarized as follows (in millions):
 
  
Balance at year-end
 
  
2013
 
2012
Commercial and other receivables
  
$
329.7

 
$
300.9

U.S. Government and prime contractors contract receivables:
  
 
 
 
Billed receivables
  
25.7

 
26.0

Unbilled receivables
  
27.8

 
28.2

 
  
383.2

 
355.1

Reserve for doubtful accounts
  
(5.2
)
 
(4.8
)
Total accounts receivable, net
  
$
378.0

 
$
350.3