Significant Accounting Policies - Summary of Expenses in Special Items (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Biomet merger-related
Merger consideration compensation expense	$ 164.1		$ 164.1
Retention plans	73.0		73.0
Consulting and professional fees	62.4	$ 13.7	86.6	$ 13.7
Employee severance	64.5		64.9
Dedicated project personnel	8.1		9.1
Relocated facilities	0.9		0.9
Contract terminations	15.9		15.9
Other	1.7		1.9
Other
Consulting and professional fees	39.6	27.0	79.3	42.0
Employee severance	0.7		0.8	0.9
Dedicated project personnel	10.1	10.9	22.5	21.8
Impairment/loss on disposal of assets		4.6	2.3	5.9
Certain R&D agreements				4.5
Relocated facilities			0.5	0.7
Distributor acquisitions		0.4		0.4
Certain litigation matters	20.3		20.3
Contract terminations		2.2		2.2
Contingent consideration adjustments		(0.1)	2.3	0.4
Accelerated software amortization		1.5	1.5	3.0
Other	8.1	2.1	10.5	3.4
Special items	$ 469.4	$ 62.3	$ 556.4	$ 98.9