Significant Accounting Policies - Summary of Expenses in Special Items (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 13, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Biomet merger-related
Consulting and professional fees		$ 19.9	$ 59.0	$ 60.7	$ 138.4
Employee termination benefits		5.4	7.1	12.0	14.3
Dedicated project personnel		10.2	21.9	33.1	64.8
Relocated facilities		1.8	9.5	6.1	17.5
Certain litigation matters		5.0		5.0
Contract terminations			3.5		28.8
Information technology integration		1.3	4.8	4.9	9.3
Goodwill and intangible asset impairment		32.7		59.5	28.0
Other		4.8	8.0	25.0	12.4
Total Biomet merger-related		81.1	113.8	206.3	313.5
Other
Consulting and professional fees		56.3	14.6	158.4	30.3
Employee termination benefits		(0.6)	3.2	2.0	3.2
Dedicated project personnel		14.0	8.2	35.5	11.5
Impairment/loss on disposal of assets					1.1
Relocated facilities		0.6		3.1	0.2
Certain litigation matters		3.0	3.7	10.0	3.7
Contract terminations			0.1		1.1
Information technology integration		1.0	0.8	1.8	1.1
Certain R&D agreements				2.5
Contingent consideration adjustments		1.7		(1.5)
Other		8.3	1.9	16.0	7.2
Total Other		84.3	56.6	227.8	83.5
Special items		$ 165.4	170.4	$ 434.1	397.0
LDR Holding Corporation [Member]
Other
Merger consideration compensation expense	$ 24.1		$ 24.1		$ 24.1