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Accounts Receivable (Tables)
 12 Months Ended
Dec. 30, 2018
Receivables [Abstract]  
Accounts Receivable
 Accounts Receivable and Unbilled Receivables (in millions):
  
Balance at year-end
 
  
2018
 
2017
Commercial and other billed receivables
  
$
381.9

 
$
372.4

Commercial and other unbilled receivables
 
96.4

 
47.4

U.S. Government and prime contractors contract receivables:
  
 
 
 
Billed receivables
  
41.3

 
26.2

Unbilled receivables
  
48.9

 
42.4

 
  
568.5

 
488.4

Allowance for doubtful accounts
  
(6.7
)
 
(10.3
)
Total accounts receivable and unbilled receivable, net
  
$
561.8

 
$
478.1