Total Net Sales by Product Group Category (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 989.8	$ 941.9	$ 2,908.3	$ 2,746.9
Vascular
Segment Reporting Information [Line Items]
Net sales	289.2	258.1	823.4	752.9
Urology
Segment Reporting Information [Line Items]
Net sales	248.4	242.1	727.4	698.8
Oncology
Segment Reporting Information [Line Items]
Net sales	270.5	258.4	792.5	752.7
Surgical Specialties
Segment Reporting Information [Line Items]
Net sales	157.7	158.8	492.5	470.1
Other Product Group
Segment Reporting Information [Line Items]
Net sales	$ 24.0	$ 24.5	$ 72.5	$ 72.4