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Cash Equivalents and Investments (Available for sales securities) (Details) - USD ($) $ in Millions | Mar. 30, 2018 | Dec. 29, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Debt Securities, Fair Value |  | $ 0.0 | $ 205.7 |
Cash Equivalents |  |  | 26.8 |
Short-term investments |  | 0.0 | 178.9 | [1]
Total available-for-sale securities |  |  | 205.7 |
US Treasury Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Debt Securities, Fair Value | [2] | 0.0 | 9.6 |
Corporate Debt Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Debt Securities, Fair Value | [2] | 0.0 | 96.0 |
Commercial Paper |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale Securities, Debt Securities, Fair Value | [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 Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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