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Property and Equipment Net (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Leasehold improvements	$ 26.4	$ 20.7
Property and equipment, gross	175.0	165.2
Accumulated depreciation	86.9	77.5
Property and equipment, net	88.1	87.7
Computers and peripheral equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	61.3	58.1
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8.4	7.6
Building
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 78.9	$ 78.8

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- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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