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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Taxes Disclosure [Line Items]
Decrease in unrecognized tax benefits within the next twelve months	$ 115.0		$ 115.0
Increase in unrecognized tax benefits within the next twelve months	25.0		$ 25.0
U.S. corporate income tax rate			21.00%		35.00%
Tax benefit resulting from return to provision adjustments	$ 16.9		$ 16.9
Effective tax rate	(5.50%)		12.10%
Biomet [Member]
Income Taxes Disclosure [Line Items]
Tax benefit recognized on Biomet merger related accounting				$ 69.7
Income tax expense (benefit)		$ (39.8)		$ (128.6)