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Investments (Summary of Investments) (Details) - USD ($)
$ in Millions
9 Months Ended
Mar. 27, 2021
Jun. 27, 2020
Schedule of Investments [Line Items]    
Cash and cash equivalents $ 1,651.7 $ 1,426.3
Other short-term investments 6.8 7.4
Other long-term investments 0.1 0.1
Other investments 6.9 7.5
Short-term investments 7.5 8.1
Long-term Investments 0.1 0.1
Investments $ 7.6 8.2
Maturity of time deposit (greater then) 3 months  
Time deposits    
Schedule of Investments [Line Items]    
Cash and cash equivalents $ 0.7 $ 0.7