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Fair Value of Financial Instruments - Additional Information (Details) - USD ($) $ in Millions | Sep. 28, 2025 | Dec. 29, 2024 | Sep. 29, 2024
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Short-term investments | $ 0.0 | $ 0.0 | $ 489.3
Carrying cost | 3,336.8 | 3,401.8 | 3,984.9
6.05% Notes Due 2034 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Carrying cost | 500.0 | 500.0 | 500.0
Fair Value, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities | 55.9 | $ 0.6 | 0.6
Short-term investments |  |  | $ 489.3
Fair Value, Recurring | US Treasury Securities |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Available-for-sale securities | $ 55.2 |  |

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