Share-Based Payments - Share-Based Compensation Expense by Share-Based Compensation Program (Details) - USD ($) $ in Millions		3 Months Ended
	Jul. 02, 2024	Mar. 31, 2025	Mar. 31, 2024
Summary of share based compensation expense associated with different programs [Abstract]
Subtotal		$ 84.1	$ 71.4
Capitalized share-based compensation costs		(3.1)	(3.3)
Share-based compensation expense included in total costs and expenses		81.0	68.1
Human Immunology Biosciences
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense	$ 56.4
Market stock units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense		0.0	0.3
Time-vested restricted stock units
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense		66.1	57.3
Performance stock units settled in stock
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense		13.6	10.5
Performance stock units settled in cash
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense		0.0	(2.1)
Employee stock purchase plan
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense		3.5	4.5
Options
Summary of share based compensation expense associated with different programs [Abstract]
Share-based compensation expense		$ 0.9	$ 0.9