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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Millions	Jun. 30, 2019	Jun. 24, 2018
Debt Securities, Available-for-sale [Line Items]
Within One Year	$ 361.6
After One, Within Five Years	177.4
After Five, Within Ten Years	0.0
After Ten Years	11.9
Total	550.9	$ 268.2
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Within One Year	22.0
After One, Within Five Years	56.5
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	78.5	109.3
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Within One Year	149.6
After One, Within Five Years	107.4
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	257.0	76.8
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Within One Year	17.1
After One, Within Five Years	8.5
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	25.6	3.9
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Within One Year	92.5
After One, Within Five Years	0.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	92.5	0.0
Certificates of deposit | United States
Debt Securities, Available-for-sale [Line Items]
Within One Year	22.4
After One, Within Five Years	0.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	22.4	0.5
Certificates of deposit | Non-US
Debt Securities, Available-for-sale [Line Items]
Within One Year	50.2
After One, Within Five Years	0.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	50.2	77.7
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Within One Year	7.8
After One, Within Five Years	0.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	7.8	0.0
Variable rate demand note
Debt Securities, Available-for-sale [Line Items]
Within One Year	0.0
After One, Within Five Years	5.0
After Five, Within Ten Years	0.0
After Ten Years	11.9
Total	$ 16.9	$ 0.0

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