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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term bank deposits | $ 214.5 | $ 0.6
Foreign currency derivative contracts | 2.5 | 0.7
Total financial assets | 3,797.7 | 3,767.4
Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 0.0 | 28.2
Government And Corporate Debentures Fixed Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | 2,626.9 | 3,008.9
Government And Corporate Debentures Floating Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | 187.8 | 184.4
Short term deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 36.8 | 69.0
Government Sponsored Enterprises Debentures |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | 714.7 | 475.6
Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term bank deposits | 214.5 | 0.6
Total financial assets | 265.8 | 97.8
Fair Value, Inputs, Level 1 | Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 14.5 | 28.2
Fair Value, Inputs, Level 1 | Short term deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 36.8 | 69.0
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency derivative contracts | 2.5 | 0.7
Total financial assets | 3,531.9 | 3,669.6
Fair Value, Inputs, Level 2 | Government And Corporate Debentures Fixed Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | 2,626.9 | 3,008.9
Fair Value, Inputs, Level 2 | Government And Corporate Debentures Floating Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | 187.8 | 184.4
Fair Value, Inputs, Level 2 | Government Sponsored Enterprises Debentures |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | $ 714.7 | $ 475.6

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