Significant Accounting Policies - Summary of Expenses in Special Items (Detail) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2015	Sep. 30, 2015	Sep. 30, 2014
Biomet-related
Merger consideration compensation expense						$ 164.1
Retention plans						73.0
Consulting and professional fees	$ 28.0			$ 27.2		114.6	$ 40.9
Employee termination benefits	14.2					79.1
Dedicated project personnel	36.8			0.3		45.9	0.3
Relocated facilities	1.6					2.5
Contract terminations	59.2					75.1
Information technology integration	1.1					1.1
Other	5.7					7.6
Other
Consulting and professional fees	30.2			21.8		109.5	63.8
Employee termination benefits	1.1					1.9	0.9
Dedicated project personnel	6.4			13.9		28.9	35.7
Impairment/loss on disposal of assets						2.3	5.9
Certain R&D agreements							4.5
Relocated facilities							0.7
Distributor acquisitions				0.1			0.5
Certain litigation matters						20.3
Contract terminations				0.3			1.5
Information technology integration	1.8					1.8
Contingent consideration adjustments	0.1			(0.2)		2.4	0.2
Accelerated software amortization				1.5		1.5	4.5
Other	9.7			1.0		20.3	4.9
Special items	$ 195.9	$ 469.2	$ 86.8	$ 65.9	$ 556.0	$ 751.9	$ 164.3