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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($)
$ in Millions
Sep. 27, 2020
Jun. 28, 2020
Debt Securities, Available-for-sale [Line Items]    
Within One Year $ 314.6  
After One, Within Five Years 387.5  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 702.1 $ 802.9
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 24.1  
After One, Within Five Years 97.8  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 121.9 132.0
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 197.1  
After One, Within Five Years 265.4  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 462.5 480.1
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 8.5  
After One, Within Five Years 9.6  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 18.1 29.1
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 44.7  
After One, Within Five Years 14.7  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 59.4 52.9
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 33.7  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 33.7 95.3
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 6.5  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total $ 6.5 $ 11.0