Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 5,377.1	$ 5,083.7
Accumulated depreciation	(3,374.7)	(3,045.1)
Property, plant and equipment, net	2,002.4	2,038.6
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	28.6	29.0
Buildings And Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	1,906.4	1,838.5
Capitalized Software Costs [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	422.7	421.6
Instruments [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,892.8	2,683.9
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 126.6	$ 110.7