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Fair Value of Financial Instruments - Summary (Details) - USD ($) $ in Millions	Dec. 31, 2023	Jun. 25, 2023
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 363.0	$ 258.1
Total short-term investments	1,731.3	1,197.9
US corporation common stock	66.1	0.0
Total assets	2,160.4	1,456.0
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	889.4	260.4
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	470.4	495.6
Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	135.6	175.3
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	90.1	50.2
U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	58.4	76.8
Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	60.1	112.3
Variable rate demand notes
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	27.3	27.3
Money market funds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	307.3	230.4
Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	4.0	0.0
U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	44.8	20.7
Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	6.9	7.0
Level 1
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	352.1	251.1
Total short-term investments	889.4	260.4
US corporation common stock	66.1	0.0
Total assets	1,307.6	511.5
Level 1 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	889.4	260.4
Level 1 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 1 | Municipal bonds
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 | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 1 | Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 1 | Variable rate demand notes
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	307.3	230.4
Level 1 | Corporate bonds
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	44.8	20.7
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	10.9	7.0
Total short-term investments	841.9	937.5
US corporation common stock	0.0	0.0
Total assets	852.8	944.5
Level 2 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	0.0	0.0
Level 2 | Corporate bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	470.4	495.6
Level 2 | Municipal bonds
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	135.6	175.3
Level 2 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	90.1	50.2
Level 2 | U.S. agency securities
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	58.4	76.8
Level 2 | Certificates of deposit
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	60.1	112.3
Level 2 | Variable rate demand notes
Assets, Fair Value Disclosure [Abstract]
Total short-term investments	27.3	27.3
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	4.0	0.0
Level 2 | U.S. treasury securities
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	0.0	0.0
Level 2 | Commercial paper
Assets, Fair Value Disclosure [Abstract]
Total cash equivalents	$ 6.9	$ 7.0

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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