Net Earnings Per Share (Components of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net earnings	$ 56.1	$ 62.1	$ 61.5	$ 37.9	$ 51.2	$ 64.1	$ 78.8	$ 36.6	$ 217.6	$ 230.7	$ 301.1
Denominator:
Weighted-average common shares outstanding used in basic EPS									136.2	127.9	127.9
Assumed exercise of dilutive options and vesting of dilutive RSUs									$ 0.2	$ 0.0	$ 0.0
Weighted average common shares outstanding used in diluted EPS									136.4	127.9	127.9
Earnings per share:
Basic	$ 0.35	$ 0.48	$ 0.48	$ 0.30	$ 0.40	$ 0.50	$ 0.62	$ 0.29	$ 1.60	$ 1.80	$ 2.35
Diluted	$ 0.35	$ 0.48	$ 0.48	$ 0.30	$ 0.40	$ 0.50	$ 0.62	$ 0.29	$ 1.60	$ 1.80	$ 2.35