(Loss) Earnings Per Share (Computation of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
Apr. 03, 2020	Mar. 29, 2019
Numerator:
Net (loss) income	$ (17.2)	$ 37.9
Denominator:
Weighted-average common shares outstanding used in basic and diluted (loss) earnings per share (in shares)	159.2	127.9
(Loss) earnings per share:
Basic and diluted (in USD per share)	$ (0.11)	$ 0.30

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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