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Fair Value of Financial Instruments - Summary (Details) - USD ($) $ in Millions | Dec. 29, 2019 | Jun. 30, 2019
--- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | $ 117.2 | $ 238.1
Total short-term investments | 568.9 | 550.9
Common stock of non-U.S. corporations | 50.7 | 39.5
Total assets | 736.8 | 828.5
Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 51.1 | 78.5
Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 327.6 | 257.0
U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 21.5 | 25.6
U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 96.4 | 92.5
Certificates of deposit | United States |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 20.6 | 22.4
Certificates of deposit | Non-US |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 45.6 | 50.2
Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 6.1 | 7.8
Variable rate demand note |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 16.9
Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 53.3 | 95.0
Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 3.6 | 15.0
U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 13.0 | 18.8
U.S. treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 2.5
Certificates of deposit | United States |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Certificates of deposit | Non-US |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 47.3 | 105.8
Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 1.0
Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 53.3 | 97.5
Total short-term investments | 96.4 | 92.5
Common stock of non-U.S. corporations | 0.0 | 0.0
Total assets | 149.7 | 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 | 96.4 | 92.5
Level 1 | Certificates of deposit | United States |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 1 | Certificates of deposit | Non-US |  |
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 | 53.3 | 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 | 0.0 | 2.5
Level 1 | Certificates of deposit | United States |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 1 | Certificates of deposit | Non-US |  |
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 | 63.9 | 140.6
Total short-term investments | 472.5 | 458.4
Common stock of non-U.S. corporations | 50.7 | 39.5
Total assets | 587.1 | 638.5
Level 2 | Municipal bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 51.1 | 78.5
Level 2 | Corporate bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 327.6 | 257.0
Level 2 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 21.5 | 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 | United States |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 20.6 | 22.4
Level 2 | Certificates of deposit | Non-US |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 45.6 | 50.2
Level 2 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 6.1 | 7.8
Level 2 | Variable rate demand note |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 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 | 3.6 | 15.0
Level 2 | U.S. agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 13.0 | 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 | United States |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 2 | Certificates of deposit | Non-US |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 47.3 | 105.8
Level 2 | Commercial paper |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 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 | United States |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total short-term investments | 0.0 | 0.0
Level 3 | Certificates of deposit | Non-US |  |
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 | United States |  |
Assets, Fair Value Disclosure [Abstract] |  |
Total cash equivalents | 0.0 | 0.0
Level 3 | Certificates of deposit | Non-US |  |
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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