Net revenues Other revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Net revenues	$ 648,319	$ 609,672	$ 1,914,410	$ 1,806,768
Vascular access
Revenue, Major Customer [Line Items]
Net revenues	148,681	142,079	446,225	426,256
Anesthesia
Revenue, Major Customer [Line Items]
Net revenues	87,123	87,531	253,098	261,764
Interventional
Revenue, Major Customer [Line Items]
Net revenues	106,883	99,975	314,852	288,306
Surgical
Revenue, Major Customer [Line Items]
Net revenues	92,621	89,908	274,911	266,046
Interventional urology
Revenue, Major Customer [Line Items]
Net revenues	73,629	48,995	201,312	138,969
OEM
Revenue, Major Customer [Line Items]
Net revenues	55,444	54,838	166,110	153,286
Other
Revenue, Major Customer [Line Items]
Net revenues	$ 83,938	$ 86,346	$ 257,902	$ 272,141