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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term bank deposits | $ 492.5 | $ 214.5
Foreign currency derivative contracts | 0.7 | 2.5
Total financial assets | 3,613.3 | 3,797.7
Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 6.6 | 14.5
Government And Corporate Debentures Fixed Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | 2,262.5 | 2,626.9
Government And Corporate Debentures Floating Interest Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | 115.1 | 187.8
Short term deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 94.5 | 36.8
Government Sponsored Enterprises Debentures |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | 641.4 | 714.7
Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term bank deposits | 492.5 | 214.5
Total financial assets | 593.6 | 265.8
Fair Value, Inputs, Level 1 | Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 6.6 | 14.5
Fair Value, Inputs, Level 1 | Short term deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash equivalents | 94.5 | 36.8
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency derivative contracts | 0.7 | 2.5
Total financial assets | 3,019.7 | 3,531.9
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 | 2,262.5 | 2,626.9
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 | 115.1 | 187.8
Fair Value, Inputs, Level 2 | Government Sponsored Enterprises Debentures |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Marketable securities | $ 641.4 | $ 714.7

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