Significant Accounting Policies - Summary of Expenses in Special Items (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Biomet merger-related
Consulting and professional fees	$ 18.7	$ 36.1
Employee termination benefits	(3.0)	4.1
Dedicated project personnel	8.7	21.7
Relocated facilities	2.8	1.7
Contract terminations		10.1
Information technology integration	2.3	1.4
Other	7.5	4.0
Total Biomet merger-related	37.0	79.1
Other
Consulting and professional fees	50.4	6.9
Employee termination benefits	1.2
Dedicated project personnel	12.8	1.8
Relocated facilities	2.4	0.2
Certain litigation matters	7.0
Information technology integration	0.5	0.1
Contingent consideration adjustments	(3.6)
Other	2.4	0.6
Total Other	73.1	9.6
Special items	$ 110.1	$ 88.7