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Investments - Non-Marketable Equity Securities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 28, 2020
Dec. 29, 2019
Net Investment Income [Line Items]    
Equity securities $ 19.3 $ 13.4
Realized gain on partial sale of investment 2.5  
Unrealized gain due to mar to market of remaining investment 7.6  
Non-marketable equity securities    
Net Investment Income [Line Items]    
Interest income and other expense, net $ 10.1