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Debt - 4.000% Senior Unsecured Notes Due 2022 - Additional Information (Detail) - 4.000% Senior Unsecured Notes Due 2022 [Member] - EUR (€)
12 Months Ended
Aug. 19, 2015
Dec. 31, 2020
Dec. 31, 2019
[1]
Debt Instrument [Line Items]      
Senior unsecured notes face amount € 500,000,000    
Senior unsecured notes, payable term   Interest on the notes is payable annually on August 19 of each year.  
Senior unsecured notes, interest rate 4.00% 4.00% [1] 4.00%
Debt instrument maturity date Aug. 19, 2022    
[1] Non-U.S. dollar denominated debt that reflects the exchange rate at period end.