Income Taxes - Changes in Deferred Tax Valuation Allowance (Details) - Deferred Tax Valuation Allowance - USD ($) $ in Millions	12 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 1,405.3	$ 1,382.1	$ 2,095.0
Additions Charged to Expenses or Other Accounts	95.1	72.8	31.7
Deductions Credited to Expenses or Other Accounts	(94.9)	(49.6)	(744.6)
Balance at End of Period	$ 1,405.5	$ 1,405.3	$ 1,382.1