Total Net Sales by Product Group Category (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 938.8	$ 873.5
Vascular
Segment Reporting Information [Line Items]
Net sales	256.6	239.5
Urology
Segment Reporting Information [Line Items]
Net sales	237.7	216.7
Oncology
Segment Reporting Information [Line Items]
Net sales	255.5	241.9
Surgical Specialties
Segment Reporting Information [Line Items]
Net sales	165.1	151.4
Other Product Group
Segment Reporting Information [Line Items]
Net sales	$ 23.9	$ 24.0