Earnings Per Share - Components of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 26, 2025	Jun. 27, 2025	Mar. 28, 2025	Sep. 27, 2024	Jun. 28, 2024	Mar. 29, 2024	Sep. 26, 2025	Sep. 27, 2024
Numerator:
Net income (loss)	$ (30.3)	$ 26.4	$ 18.0	$ 8.2	$ (1,151.6)	$ 23.6	$ 14.1	$ (1,119.8)
Denominator:
Weighted-average common shares outstanding used in basic earnings per share (in shares)	166.1			172.2			169.2	172.1
Incremental common shares from:
Assumed exercise of dilutive options and vesting of dilutive restricted stock units and performance stock units (in shares)	0.0			0.7			1.1	0.0
Weighted average common shares outstanding used in diluted earnings (loss) per share (in shares)	166.1			172.9			170.3	172.1
(Loss) Earnings per share:
(Loss) Earnings - basic (in USD per share)	$ (0.18)			$ 0.05			$ 0.08	$ (6.51)
(Loss) Earnings - diluted (in USD per share)	$ (0.18)			$ 0.05			$ 0.08	$ (6.51)