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Cash, Cash Equivalents and Short-term Investments - Investments in Debt Securities by Contractual Maturities (Details) - USD ($)
$ in Millions
Mar. 28, 2020
Jun. 29, 2019
Amortized Cost    
Due in 1 year $ 720.1 $ 178.9
Due in 1 year through 5 years 43.3 148.1
Due in 5 years through 10 years 0.0 6.0
Due after 10 years 0.0 1.8
Total 763.4 334.8
Fair Value    
Due in 1 year 720.0 179.1
Due in 1 year through 5 years 43.1 149.0
Due in 5 years through 10 years 0.0 6.0
Due after 10 years 0.0 1.8
Total $ 763.1 $ 335.9