Retirement Benefit Plans - Changes in Projected Benefit Obligations and Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation - beginning of year	$ 386.6	$ 316.7
Service cost	11.8	10.9	$ 11.9
Interest cost	15.8	15.5	13.2
Plan amendments	(21.9)
Benefits paid	(12.3)	(10.0)
Actuarial (gain) loss	(4.9)	53.5
Projected benefit obligation - end of year	375.1	386.6	316.7
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation - beginning of year	423.7	371.5
Obligation assumed from Biomet	159.4
Service cost	18.9	14.7	16.1
Interest cost	8.8	9.2	5.6
Plan amendments		(7.0)
Employee contributions	16.9	18.5
Benefits paid	(24.1)	(22.6)
Actuarial (gain) loss	(18.9)	77.9
Expenses paid	(0.3)	(0.2)
Settlement	(0.2)
Translation (gain) loss	(15.6)	(38.3)
Projected benefit obligation - end of year	$ 568.6	$ 423.7	$ 371.5