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Investments - Investment Securities, Aggregated by Investment Type and Length of Time (Details)
$ in Millions
Jun. 27, 2021
USD ($)
security
Jun. 28, 2020
USD ($)
security
Fair Value    
Less than 12 Months $ 227.9 $ 65.8
Greater than 12 Months 0.0 0.0
Total 227.9 65.8
Unrealized Loss    
Less than 12 Months 0.4 0.0
Greater than 12 Months 0.0 0.0
Total $ (0.4) $ 0.0
Number of securities with an unrealized loss    
Less than 12 Months | security 134 46
Greater than 12 Months | security 0 0
Total | security 134 46
Maximum    
Unrealized Loss    
Less than 12 Months   $ 0.1
Municipal bonds    
Fair Value    
Less than 12 Months $ 28.8 14.3
Greater than 12 Months 0.0 0.0
Total 28.8 14.3
Unrealized Loss    
Less than 12 Months 0.0 0.0
Greater than 12 Months 0.0 0.0
Total 0.0 0.0
Corporate bonds    
Fair Value    
Less than 12 Months 133.8 29.1
Greater than 12 Months 0.0 0.0
Total 133.8 29.1
Unrealized Loss    
Less than 12 Months 0.3 0.0
Greater than 12 Months 0.0 0.0
Total (0.3) 0.0
U.S. agency securities    
Fair Value    
Less than 12 Months 16.7 8.6
Greater than 12 Months 0.0 0.0
Total 16.7 8.6
Unrealized Loss    
Less than 12 Months 0.0 0.0
Greater than 12 Months 0.0 0.0
Total 0.0 0.0
U.S. treasury securities    
Fair Value    
Less than 12 Months 47.9 13.8
Greater than 12 Months 0.0 0.0
Total 47.9 13.8
Unrealized Loss    
Less than 12 Months 0.1 0.0
Greater than 12 Months 0.0 0.0
Total (0.1) $ 0.0
Certificates of deposit    
Fair Value    
Less than 12 Months 0.7  
Greater than 12 Months 0.0  
Total 0.7  
Unrealized Loss    
Less than 12 Months 0.0  
Greater than 12 Months 0.0  
Total $ 0.0