Income Taxes - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)
Income Taxes Disclosure [Line Items]
Decrease in unrecognized tax benefits within the next twelve months	$ 300.0	$ 300.0
Increase in unrecognized tax benefits within the next twelve months	50.0	50.0
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)
Net income tax expense recognized related to previous periods for certain tax restructurings and product liability matters	$ 10.5	$ 10.5