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Accounts Receivable and Unbilled Receivables
 12 Months Ended
Jan. 02, 2022
Receivables [Abstract]  
Accounts Receivable and Unbilled Receivables Accounts Receivable and Unbilled Receivables
Accounts Receivable and Unbilled Receivables (in millions):  Balance at year-end
   20212020
Commercial and other billed receivables  $672.9 $377.4 
U.S. Government and prime contractors billed receivables108.6 36.9 
781.5 414.3 
Allowance for doubtful accounts(13.8)(12.3)
Account receivable, net$767.7 $402.0 
Commercial and other unbilled receivables, net$158.3 $147.1 
U.S. Government and prime contractors unbilled receivables, net  157.8 75.0 
Unbilled receivables, net  $316.1 $222.1