Net Earnings Per Share (Narrative) (Details) - shares		3 Months Ended		9 Months Ended
	Sep. 20, 2019	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares held by Danaher (in shares)		158,700,000		158,700,000		100
Issuance of common stock (in shares)	30,800,000
Common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Issuance of common stock (in shares)		30,800,000	0	30,800,000	0
Danaher
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares of common stock previously held by Danaher				100
Shares held by Danaher (in shares)		127,900,000		127,900,000