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Accounts Receivable and Unbilled Receivables (Details) - USD ($)
$ in Millions
Dec. 29, 2019
Dec. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed Contracts Receivable $ 470.6 $ 423.2
Allowance for doubtful accounts (10.2) (6.7)
Accounts and Other Receivables, Net, Current 460.4 416.5
Unbilled Contracts Receivable 200.4 145.3
Commercial and Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed Contracts Receivable 440.1 381.9
Unbilled Contracts Receivable 143.9 96.4
U.S. Government and Prime Contractors    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Billed Contracts Receivable 30.5 41.3
Unbilled Contracts Receivable $ 56.5 $ 48.9