Fair Value of Financial Instruments - Fair Value Hierarchy (Details) - USD ($) $ in Millions	Sep. 28, 2025	Dec. 29, 2024	Sep. 29, 2024
Assets:
Short-term investments	$ 0.0	$ 0.0	$ 489.3
Fair Value, Recurring
Assets:
Short-term investments			489.3
Available-for-sale securities	55.9	0.6	0.6
Derivatives	1.0	9.7	3.4
Total assets	56.9	10.3	493.3
Liabilities:
Derivatives	8.6	1.7	5.9
Option agreement			1.7
Total liabilities	8.6	1.7	7.6
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Short-term investments			489.3
Available-for-sale securities	55.9	0.6	0.6
Derivatives	0.0	0.0	0.0
Total assets	55.9	0.6	489.9
Liabilities:
Derivatives	0.0	0.0	0.0
Option agreement			0.0
Total liabilities	0.0	0.0	0.0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Short-term investments			0.0
Available-for-sale securities	0.0	0.0	0.0
Derivatives	1.0	9.7	3.4
Total assets	1.0	9.7	3.4
Liabilities:
Derivatives	8.6	1.7	5.9
Option agreement			0.0
Total liabilities	8.6	1.7	5.9
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Short-term investments			0.0
Available-for-sale securities	0.0	0.0	0.0
Derivatives	0.0	0.0	0.0
Total assets	0.0	0.0	0.0
Liabilities:
Derivatives	0.0	0.0	0.0
Option agreement			1.7
Total liabilities	$ 0.0	$ 0.0	$ 1.7