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Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
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