Significant Accounting Policies - Summary of Expenses in Special Items (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Biomet merger-related
Consulting and professional fees	$ 22.1	$ 43.3	$ 40.8	$ 79.4
Employee termination benefits	9.6	3.1	6.6	7.2
Dedicated project personnel	14.2	21.2	22.9	42.9
Relocated facilities	1.5	6.3	4.3	8.0
Contract terminations		15.2		25.3
Information technology integration	1.3	3.1	3.6	4.5
Intangible asset impairment	26.8	28.0	26.8	28.0
Other	12.7	0.4	20.2	4.4
Total Biomet merger-related	88.2	120.6	125.2	199.7
Other
Consulting and professional fees	51.7	8.8	102.1	15.7
Employee termination benefits	1.4		2.6
Dedicated project personnel	8.7	1.5	21.5	3.3
Impairment/loss on disposal of assets		1.1		1.1
Relocated facilities	0.1		2.5	0.2
Certain litigation matters			7.0
Contract terminations		1.0		1.0
Information technology integration	0.3	0.2	0.8	0.3
Certain R&D agreements	2.5		2.5
Contingent consideration adjustments	0.4		(3.2)
Other	5.3	4.7	7.7	5.3
Total Other	70.4	17.3	143.5	26.9
Special items	$ 158.6	$ 137.9	$ 268.7	$ 226.6