Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020	Dec. 31, 2017
Business And Significant Accounting Policies [Line Items]
Expenses incurred related to shipping and handling of products	$ 3,177.8	$ 3,343.8	$ 3,379.3
Restructuring and other cost reduction initiatives	$ 116.9	50.0	34.2
Employees dedication percentage for dedicated project personnel expenses	100.00%
Allowance for doubtful accounts	$ 75.8	65.0
Cumulative adjustment to retained earnings	$ 12,199.4	12,392.8	11,276.1		$ 11,735.5
Cumulative Effect, Period of Adoption, Adjustment [Member]
Business And Significant Accounting Policies [Line Items]
Cumulative adjustment to retained earnings				$ 3.1
Minimum [Member]
Business And Significant Accounting Policies [Line Items]
Useful life of finite lived intangibles	1 year
Maximum [Member]
Business And Significant Accounting Policies [Line Items]
Useful life of finite lived intangibles	20 years
Building and Building Improvements [Member] | Minimum [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	10 years
Building and Building Improvements [Member] | Maximum [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	40 years
Machinery and Equipment [Member] | Minimum [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	3 years
Machinery and Equipment [Member] | Maximum [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	8 years
Capitalized Software Costs [Member] | Minimum [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	3 years
Capitalized Software Costs [Member] | Maximum [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	15 years
Instruments [Member]
Business And Significant Accounting Policies [Line Items]
Average estimated useful life	5 years
Shipping and Handling [Member]
Business And Significant Accounting Policies [Line Items]
Expenses incurred related to shipping and handling of products	$ 269.9	$ 292.7	$ 290.2