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Balance Sheet Details - Accounts Receivable and Inventory (Details) - USD ($) $ in Millions | Dec. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Cash and Cash Equivalents |  |
Cash and cash equivalents | $ 182.7 | $ 130.5
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total current accounts receivable | 239.7 | 212.8
Allowance for doubtful accounts | (2.3) | (0.5)
Total accounts receivable, net | 237.4 | 212.3
Inventory, Net of Allowances, Customer Advances and Progress Billings [Abstract] |  |
Raw materials | 34.7 | 35.9
Work in process | 10.3 | 11.4
Finished goods | 1.8 | 2.3
Subtotal inventoried costs | 46.8 | 49.6
Less customer advances and progress payments | 0.0 | (0.6)
Total inventoried costs | 46.8 | 49.0
Billed |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total current accounts receivable | 66.5 | 74.3
Unbilled |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total current accounts receivable | 173.2 | 138.5
U.S. Government |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total U.S. Government contract receivables | 99.6 | 72.0
U.S. Government | Billed |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total U.S. Government contract receivables | 16.5 | 16.9
U.S. Government | Unbilled |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total U.S. Government contract receivables | $ 83.1 | $ 55.1

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