Recent Accounting Pronouncements (New Accounting Adoption Effect) (Details) - USD ($) $ in Millions	Dec. 28, 2019	Jun. 30, 2019	Jun. 29, 2019
Current Assets:
Prepaid expenses	$ 65.2	$ 62.0	$ 99.8
Other current assets	124.4	88.7	91.0
Operating lease right-of-use assets
Operating lease right-of-use assets	1,996.5	2,133.7
Intangible assets	1,649.8	1,653.4	1,711.9
Deferred income tax assets	36.1	21.1	19.4
Other assets	108.7	106.8	134.2
Current Liabilities:
Accrued liabilities	670.1	634.4	673.6
Operating lease liabilities	329.8	362.3
Current debt	0.0	0.0	0.8
Long-term Liabilities:
Long-term debt	1,598.0	1,596.6	1,601.9
Operating lease liabilities	1,901.2	1,961.6
Deferred income tax liabilities	230.5	221.0	234.1
Other liabilities	245.7	246.8	454.0
Stockholders' Equity:
Retained earnings (accumulated deficit)	$ 71.3	242.7	$ 291.6
Accounting Standards Update 2016-02
Current Assets:
Prepaid expenses		(37.8)
Other current assets		(2.3)
Operating lease right-of-use assets
Operating lease right-of-use assets		2,133.7
Intangible assets		(58.5)
Deferred income tax assets		1.7
Other assets		(27.4)
Current Liabilities:
Accrued liabilities		(39.2)
Operating lease liabilities		362.3
Current debt		(0.8)
Long-term Liabilities:
Long-term debt		(5.3)
Operating lease liabilities		1,961.6
Deferred income tax liabilities		(13.1)
Other liabilities		(207.2)
Stockholders' Equity:
Retained earnings (accumulated deficit)		$ (48.9)