Segment Data - Summary of Net Sales by Product Category (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue from External Customer [Line Items]
Net Sales	$ 2,074.3	$ 1,818.1	$ 1,954.4	$ 1,977.3	$ 2,013.1	$ 1,832.8	$ 1,934.0	$ 1,904.0	$ 7,824.1	$ 7,683.9	$ 5,997.8
Knees [Member]
Revenue from External Customer [Line Items]
Net Sales									2,737.1	2,752.6	2,276.8
Hips [Member]
Revenue from External Customer [Line Items]
Net Sales									1,879.1	1,867.9	1,533.0
S.E.T [Member]
Revenue from External Customer [Line Items]
Net Sales									1,709.1	1,644.4	1,214.6
Dental [Member]
Revenue from External Customer [Line Items]
Net Sales									418.6	427.9	335.7
Spine and CMF [Member]
Revenue from External Customer [Line Items]
Net Sales									759.5	662.0	404.4
Other [Member]
Revenue from External Customer [Line Items]
Net Sales									$ 320.7	$ 329.1	$ 233.3