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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Millions	Dec. 29, 2019	Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items]
Within One Year	$ 359.0
After One, Within Five Years	209.9
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	568.9	$ 550.9
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Within One Year	20.6
After One, Within Five Years	30.5
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	51.1	78.5
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Within One Year	180.5
After One, Within Five Years	147.1
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	327.6	257.0
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Within One Year	6.0
After One, Within Five Years	15.5
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	21.5	25.6
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Within One Year	80.6
After One, Within Five Years	15.8
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	96.4	92.5
Certificates of deposit | Non-US
Debt Securities, Available-for-sale [Line Items]
Within One Year	44.6
After One, Within Five Years	1.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	45.6	50.2
Certificates of deposit | United States
Debt Securities, Available-for-sale [Line Items]
Within One Year	20.6
After One, Within Five Years	0.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	20.6	22.4
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Within One Year	6.1
After One, Within Five Years	0.0
After Five, Within Ten Years	0.0
After Ten Years	0.0
Total	$ 6.1	$ 7.8

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