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Income Taxes - Components of Income from Continuing Operations (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 30, 2019
Income Tax Disclosure [Abstract]      
Domestic $ (348.7) $ (210.3) $ (92.2)
Foreign 8.5 4.7 (30.7)
Loss before income taxes $ (340.2) $ (205.6) $ (122.9)