Total Net Sales by Product Group Category (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 979.7	$ 931.5	$ 1,918.5	$ 1,805.0
Vascular
Segment Reporting Information [Line Items]
Net sales	277.6	255.3	534.2	494.8
Urology
Segment Reporting Information [Line Items]
Net sales	241.3	240.0	479.0	456.7
Oncology
Segment Reporting Information [Line Items]
Net sales	266.5	252.4	522.0	494.3
Surgical Specialties
Segment Reporting Information [Line Items]
Net sales	169.7	159.9	334.8	311.3
Other Product Group
Segment Reporting Information [Line Items]
Net sales	$ 24.6	$ 23.9	$ 48.5	$ 47.9