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Fair Value of Financial Instruments - Summary (Details) - USD ($) $ in Millions | Jun. 28, 2020 | Jun. 30, 2019
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Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | $ 303.9 | $ 238.1
Total short-term investments | 802.9 | 550.9
Common stock of non-U.S. corporations | 55.9 | 39.5
Total assets | 1,162.7 | 828.5
Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 132.0 | 78.5
Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 480.1 | 257.0
U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 29.1 | 25.6
U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 52.9 | 92.5
Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 95.3 | 72.6
Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 11.0 | 7.8
Variable rate demand note |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 2.5 | 16.9
Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 199.9 | 95.0
Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 15.0
U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 19.6 | 18.8
U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 19.0 | 2.5
Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 54.3 | 105.8
Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 11.1 | 1.0
Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 218.9 | 97.5
Total short-term investments | 52.9 | 92.5
Common stock of non-U.S. corporations | 0.0 | 0.0
Total assets | 271.8 | 190.0
Level 1 | Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 1 | Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 1 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 1 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 52.9 | 92.5
Level 1 | Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 1 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 1 | Variable rate demand note |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 1 | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 199.9 | 95.0
Level 1 | Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 1 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 1 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 19.0 | 2.5
Level 1 | Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 1 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 85.0 | 140.6
Total short-term investments | 750.0 | 458.4
Common stock of non-U.S. corporations | 55.9 | 39.5
Total assets | 890.9 | 638.5
Level 2 | Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 132.0 | 78.5
Level 2 | Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 480.1 | 257.0
Level 2 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 29.1 | 25.6
Level 2 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 2 | Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 95.3 | 72.6
Level 2 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 11.0 | 7.8
Level 2 | Variable rate demand note |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 2.5 | 16.9
Level 2 | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 2 | Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 15.0
Level 2 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 19.6 | 18.8
Level 2 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 2 | Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 54.3 | 105.8
Level 2 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 11.1 | 1.0
Level 3 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Total short-term investments | 0.0 | 0.0
Common stock of non-U.S. corporations | 0.0 | 0.0
Total assets | 0.0 | 0.0
Level 3 | Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Variable rate demand note |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | Certificates of deposit |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | $ 0.0 | $ 0.0

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