Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 5,246.9	$ 5,083.7
Accumulated depreciation	(3,215.6)	(3,045.1)
Property, plant and equipment, net	2,031.3	2,038.6
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	29.3	29.0
Buildings And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	1,880.4	1,838.5
Capitalized Software Costs [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	433.9	421.6
Instruments [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,786.9	2,683.9
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 116.4	$ 110.7