Retirement Benefit Plan - Changes in Fair Value of Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
U.S. and Puerto Rico [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value - beginning of year	$ 374.1	$ 402.2
Actual return on plan assets	29.5	(16.6)
Employer contributions	5.8	0.8
Settlements	(5.7)
Benefits paid	(14.3)	(12.3)
Plan assets at fair market value - end of year	389.4	374.1
Funded status	12.5	(1.0)
Foreign-based Defined Benefit Plans [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Plan assets at fair market value - beginning of year	505.6	385.4
Assets contributed by Biomet		129.4
Actual return on plan assets	34.1	(4.0)
Employer contributions	15.9	14.8
Employee contributions	23.6	16.9
Settlements		(0.2)
Plan amendments		(0.2)
Benefits paid	(31.6)	(24.1)
Expenses paid	(0.2)	(0.3)
Translation loss	(40.4)	(12.3)
Plan assets at fair market value - end of year	507.0	505.6
Funded status	$ (61.6)	$ (63.0)