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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.