Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Business And Significant Accounting Policies [Line Items]
Expenses incurred related to shipping and handling of products	$ 2,252.6	$ 2,271.9	$ 2,132.9
Restructuring and other cost reduction initiatives	$ 50.0	34.2	17.6
Employees dedication percentage for dedicated project personnel expenses	100.00%
Allowance for doubtful accounts	$ 65.0	65.7
Right-of-use asset	$ 266.7			$ 274.7
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets			us-gaap:OtherAssetsNoncurrent
Lease liabilities, current	$ 64.2			$ 62.2
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent			us-gaap:OtherLiabilitiesCurrent
Lease liabilities, noncurrent	$ 215.5			$ 221.2
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent			us-gaap:OtherLiabilitiesNoncurrent
Cumulative adjustment to retained earnings	$ 0.0
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	$ 292.7	$ 290.2	$ 263.6