Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 5,559.2	$ 5,437.1
Accumulated depreciation	(3,545.2)	(3,421.7)
Property, plant and equipment, net	2,014.0	2,015.4
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	28.0	28.0
Buildings And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	1,918.7	1,885.6
Capitalized Software Costs [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	438.5	425.8
Instruments [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	3,035.9	2,950.5
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 138.1	$ 147.2