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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($)
$ in Millions
Mar. 28, 2021
Jun. 28, 2020
Debt Securities, Available-for-sale [Line Items]    
Within One Year $ 213.0  
After One, Within Five Years 537.7  
After Five, Within Ten Years 0.0  
After Ten Years 11.0  
Total 761.7 $ 790.9
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 25.9  
After One, Within Five Years 111.7  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 137.6 132.0
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 120.5  
After One, Within Five Years 353.6  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 474.1 480.1
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 3.0  
After One, Within Five Years 12.3  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 15.3 29.1
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 9.6  
After One, Within Five Years 60.1  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 69.7 52.9
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 12.8  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 12.8 83.3
Variable rate demand note    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 0.0  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 11.0  
Total 11.0 2.5
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 41.2  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total $ 41.2 $ 11.0