Retirement Benefit Plans - Changes in Projected Benefit Obligations and Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation - beginning of year	$ 375.1	$ 386.6
Service cost	9.6	11.8	$ 10.9
Interest cost	13.8	15.8	15.5
Plan amendments		(21.9)
Benefits paid	(14.3)	(12.3)
Actuarial (gain) loss	(1.6)	(4.9)
Settlement	(5.7)
Projected benefit obligation - end of year	376.9	375.1	386.6
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Projected benefit obligation - beginning of year	568.6	423.7
Obligation assumed from Biomet		159.4
Service cost	19.0	18.9	14.7
Interest cost	10.0	8.8	9.2
Plan amendments	(23.4)
Employee contributions	23.6	16.9
Benefits paid	(31.6)	(24.1)
Actuarial (gain) loss	46.7	(18.9)
Expenses paid	(0.2)	(0.3)
Settlement		(0.2)
Translation gain	(44.1)	(15.6)
Projected benefit obligation - end of year	$ 568.6	$ 568.6	$ 423.7