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Cash Equivalents and Investments (Available for sales securities) (Details) - USD ($) $ in Millions | Sep. 28, 2018 | Dec. 29, 2017
--- | --- | ---
Debt Securities, Available-for-sale [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 |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Debt Securities, Fair Value | [2] | 0.0 | 9.6 |
Corporate Debt Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Debt Securities, Fair Value | [2] | 0.0 | 96.0 |
Commercial Paper |  |  |  |
Debt Securities, Available-for-sale [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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