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Supplemental Balance Sheet Information - Accounts Receivable And Unbilled Receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Jan. 01, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed receivables $ 911.2 $ 895.4
Allowance for doubtful accounts (11.5) (11.7)
Account receivable, net 899.7 883.7
Commercial and other unbilled receivables, net 302.4 274.7
Commercial and other billed receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed receivables 760.9 763.1
Commercial and other unbilled receivables, net 156.7 148.3
U.S. Government and prime contractors billed receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed receivables 150.3 132.3
Commercial and other unbilled receivables, net $ 145.7 $ 126.4