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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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