Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 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%
Effective tax rate	15.10%		18.20%
Biomet [Member]
Income Taxes Disclosure [Line Items]
Tax benefit recognized on Biomet merger related accounting				$ 69.7
Income tax expense (benefit)		$ (67.0)		$ (88.8)