Significant Accounting Policies - Summary of Expenses in Special Items (Detail) - USD ($) $ in Millions		12 Months Ended
	Jul. 13, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Biomet-related
Merger consideration compensation expense				$ 90.4
Retention plans				73.0
Consulting and professional fees		$ 81.5	$ 220.4	167.4
Employee termination benefits		12.1	50.8	101.0
Dedicated project personnel		50.6	79.8	62.3
Relocated facilities		7.7	19.1	5.6
Certain litigation matters		15.5	2.5
Contract terminations		5.2	39.9	95.0
Information technology integration		5.9	14.3	5.2
Intangible asset impairment		26.8	30.0
Loss/impairment on assets		9.8	13.0
Other		32.9	17.5	19.2
Total Biomet-related		248.0	487.3	619.1
Other
Merger consideration compensation expense				90.4
Consulting and professional fees		218.1	33.0	114.8
Employee termination benefits		3.5	7.0	1.9
Dedicated project personnel		45.6	17.3	31.8
Relocated facilities		6.3	0.2
Certain litigation matters		78.2	30.8	31.2
Certain claims (Note 19)		10.3		7.7
Contract terminations		3.9	2.9
Information technology integration		2.9	1.3	1.8
Intangible asset impairment			1.1
Loss/impairment on assets				3.8
Contingent consideration adjustments		(4.5)		2.4
Certain R&D agreements		2.5
Other		18.3	6.8	25.0
Total Other		385.1	124.5	220.4
Special items		$ 633.1	611.8	$ 839.5
LDR Holding Corporation [Member]
Biomet-related
Merger consideration compensation expense	$ 24.1		24.1
Other
Merger consideration compensation expense	$ 24.1		$ 24.1