Net revenues - Other revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Net revenues	$ 711,179	$ 628,301	$ 567,034	$ 630,642	$ 680,952	$ 648,319	$ 652,507	$ 613,584	$ 2,537,156	$ 2,595,362	$ 2,448,383
Vascular access
Disaggregation of Revenue [Line Items]
Net revenues									657,703	600,874	575,327
Anesthesia
Disaggregation of Revenue [Line Items]
Net revenues									302,293	338,413	349,370
Interventional
Disaggregation of Revenue [Line Items]
Net revenues									382,435	427,563	395,423
Surgical
Disaggregation of Revenue [Line Items]
Net revenues									317,200	370,074	358,707
Interventional urology
Disaggregation of Revenue [Line Items]
Net revenues									290,022	290,449	196,735
OEM
Disaggregation of Revenue [Line Items]
Net revenues									220,246	220,717	205,976
Other
Disaggregation of Revenue [Line Items]
Net revenues									$ 367,257	$ 347,272	$ 366,845