Total Net Sales by Product Group Category (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Net sales	$ 941.9	$ 865.7	$ 2,746.9	$ 2,545.2
Vascular
Segment Reporting Information [Line Items]
Net sales	258.1	250.5	752.9	731.0
Urology
Segment Reporting Information [Line Items]
Net sales	242.1	212.3	698.8	627.1
Oncology
Segment Reporting Information [Line Items]
Net sales	258.4	239.3	752.7	699.1
Surgical Specialties
Segment Reporting Information [Line Items]
Net sales	158.8	139.8	470.1	419.5
Other Product Group
Segment Reporting Information [Line Items]
Net sales	$ 24.5	$ 23.8	$ 72.4	$ 68.5