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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($)
$ in Millions
Jun. 28, 2020
Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]    
Within One Year $ 380.1  
After One, Within Five Years 420.3  
After Five, Within Ten Years 0.0  
After Ten Years 2.5  
Total 802.9 $ 550.9
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 29.4  
After One, Within Five Years 102.6  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 132.0 78.5
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 191.0  
After One, Within Five Years 289.1  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 480.1 257.0
U.S. agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 17.3  
After One, Within Five Years 11.8  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 29.1 25.6
U.S. treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 36.1  
After One, Within Five Years 16.8  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 52.9 92.5
Certificates of deposit    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 95.3  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 95.3 72.6
Commercial paper    
Debt Securities, Available-for-sale [Line Items]    
Within One Year 11.0  
After One, Within Five Years 0.0  
After Five, Within Ten Years 0.0  
After Ten Years 0.0  
Total 11.0 7.8
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 2.5  
Total $ 2.5 $ 16.9