Earnings (Loss) Per Share - Components of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Numerator:
Net income (loss)	$ 90.1	$ (93.5)	$ 161.8	$ (110.7)
Denominator:
Weighted-average common shares outstanding used in basic earnings per share (in shares)	161.2	159.5	160.8	159.3
Assumed exercise of dilutive options and vesting of dilutive restricted stock units (in shares)	4.5	0.0	4.5	0.0
Assumed conversion of the Notes (in shares)	12.7	0.0	11.9	0.0
Weighted average common shares outstanding used in diluted earnings per share (in shares)	178.4	159.5	177.2	159.3
Earnings (loss) per share:
Basic (in USD per share)	$ 0.56	$ (0.59)	$ 1.01	$ (0.69)
Diluted (in USD per share)	$ 0.51	$ (0.59)	$ 0.91	$ (0.69)