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Cash and Cash Equivalents, Available for Sale Investments (Details) - USD ($) $ in Millions | Dec. 28, 2018 | Dec. 29, 2017
--- | --- | ---
Cash and Cash Equivalents [Line Items] |  |  |  |
Debt Securities, Available-for-sale |  | $ 0.0 | $ 205.7 |
Cash and cash equivalents |  |  | 26.8 |
Short-term investments |  | 0.0 | 178.9 | [1]
Total |  |  | 205.7 |
US Treasury Securities [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 9.6 |
Corporate Debt Securities [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Debt Securities, Available-for-sale | [2] | 0.0 | 96.0 |
Commercial Paper [Member] |  |  |  |
Cash and Cash Equivalents [Line Items] |  |  |  |
Debt Securities, Available-for-sale | [2] | $ 0.0 | $ 100.1 |
[1] | See Note 2 for a summary of adjustments
[2] | The Company’s available-for sale securities are valued using readily available pricing sources for comparable instruments, or model-driven valuations using significant inputs derived from or corroborated by observable market data, including yield curves and credit ratings.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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