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Accounts Receivable (Tables)
 12 Months Ended
Jan. 01, 2017
Receivables [Abstract]  
Accounts Receivable
 Accounts receivable (in millions):
  
Balance at year-end
 
  
2016
 
2015
Commercial and other receivables
  
$
329.1

 
$
325.5

U.S. Government and prime contractors contract receivables:
  
 
 
 
Billed receivables
  
19.2

 
19.9

Unbilled receivables
  
40.6

 
33.9

 
  
388.9

 
379.3

Allowance for doubtful accounts
  
(5.2
)
 
(6.3
)
Total accounts receivable, net
  
$
383.7

 
$
373.0