Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 5,817.3	$ 5,437.1
Accumulated depreciation	(3,762.0)	(3,421.7)
Property, plant and equipment, net	2,055.3	2,015.4
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	27.5	28.0
Buildings And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	1,959.5	1,885.6
Capitalized Software Costs [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	468.1	425.8
Instruments [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	3,214.2	2,950.5
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 148.0	$ 147.2