Significant Accounting Policies - Summary of Expenses in Special Items (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Biomet-related
Merger compensation expense	$ 90.4	$ 0.0	$ 0.0
Retention plans	73.0
Employee termination benefits	101.0
Consulting and professional fees	167.4	61.5
Dedicated project personnel	62.3	0.4
Relocated facilities	5.6
Contract terminations	95.0
Information technology integration	5.2
Other	19.2
Other
Employee termination benefits	1.9	0.9	14.2
Consulting and professional fees	114.8	115.2	99.1
Dedicated project personnel	31.8	50.4	34.0
Impairment/loss on disposal of assets	2.3	24.0	10.9
Certain R&D agreements		4.5	0.8
Relocated facilities		0.7	3.6
Distributor acquisitions		0.6	0.4
Certain litigation matters	31.2	70.0	26.9
Contract terminations		1.8	3.9
Information technology integration	1.8
Contingent consideration adjustments	2.4	0.6	9.0
Accelerated software amortization	1.5	6.0	6.0
Other	25.0	4.5	1.5
Special items	$ 831.8	$ 341.1	$ 210.3