Earnings (Loss) Per Share (Computation of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Numerator:
Net (loss) income	$ 35.6	$ 62.1	$ (75.1)	$ 161.5
Denominator:
Basic (in shares)	159.7	130.6	159.4	128.8
Assumed exercise of dilutive options and vesting of dilutive restricted stock units (in shares)	2.0	0.0	0.0	0.0
Assumed conversion impact of the Notes (in shares)	2.2	0.0	0.0	0.0
Diluted (in shares)	163.9	130.6	159.4	128.8
Earnings (loss) per share:
Basic (in USD per share)	$ 0.22	$ 0.48	$ (0.47)	$ 1.25
Diluted (in USD per share)	$ 0.22	$ 0.48	$ (0.47)	$ 1.25