Goodwill and Intangible Assets - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended		9 Months Ended
	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Indefinite Lived Intangible Assets By Major Class [Line Items]
Reporting units with goodwill assigned to them	3
Impairment				$ 612.0
Goodwill				9,038.8	$ 9,599.7
Intangible asset impairment				19.0
In-Process Research and Development [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Intangible asset impairment		$ 33.0	$ 70.1
Remaining impairment charge of intangible assets indefinite lived excluding goodwill				14.0
Dental [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Impairment	$ 142.0			142.0
Goodwill				257.3
EMEA [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Impairment	470.0			470.0
Goodwill				$ 303.7	$ 749.8
EMEA [Member] | Reportable Segment Change [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Impairment	$ 470.0
America CMFT [Member]
Indefinite Lived Intangible Assets By Major Class [Line Items]
Reporting units with goodwill assigned to them	2
Percentage of fair value in excess of carrying amount				5.00%