Significant Accounting Policies - Summary of Expenses in Special Items (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Biomet-related
Merger consideration compensation expense		$ 164.1		$ 164.1
Retention plans		73.0		73.0
Consulting and professional fees	$ 43.3	62.4	$ 79.4	86.6
Employee termination benefits	3.1	64.5	7.2	64.9
Dedicated project personnel	21.2	8.1	42.9	9.1
Relocated facilities	6.3	0.9	8.0	0.9
Contract terminations	15.2	15.9	25.3	15.9
Information technology integration	3.1		4.5
Intangible asset impairment	28.0		28.0
Other	0.4	1.7	4.4	1.9
Total Biomet-related	120.6	390.6	199.7	416.4
Other
Consulting and professional fees	8.8	39.6	15.7	79.3
Employee termination benefits		0.7		0.8
Dedicated project personnel	1.5	10.1	3.3	22.5
Impairment/loss on disposal of assets	1.1		1.1	2.3
Relocated facilities			0.2	0.5
Certain litigation matters		20.3		20.3
Contract terminations	1.0		1.0
Information technology integration	0.2		0.3
Contingent consideration adjustments				2.3
Accelerated software amortization				1.5
Other	4.7	7.9	5.3	10.1
Total Other	17.3	78.6	26.9	139.6
Special items	$ 137.9	$ 469.2	$ 226.6	$ 556.0