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Investments - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Jun. 25, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | $ 1,261.1 |
After One, Within Five Years | 440.5 |
After Five, Within Ten Years | 10.7 |
After Ten Years | 19.0 |
Total | 1,731.3 | $ 1,197.9
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 780.6 |
After One, Within Five Years | 108.8 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 889.4 | 260.4
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 214.1 |
After One, Within Five Years | 256.3 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 470.4 | 495.6
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 57.8 |
After One, Within Five Years | 75.4 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 2.4 |
Total | 135.6 | 175.3
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 90.1 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 90.1 |
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 58.4 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 58.4 | 76.8
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 60.1 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 0.0 |
After Ten Years | 0.0 |
Total | 60.1 | 112.3
Variable rate demand notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Within One Year | 0.0 |
After One, Within Five Years | 0.0 |
After Five, Within Ten Years | 10.7 |
After Ten Years | 16.6 |
Total | $ 27.3 | $ 27.3

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