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Derivatives and Financial Instruments - Additional Information (Detail)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
EUR (€)
Derivative Instruments and Hedging Activities Disclosure [Line Items]      
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax $ 2.8 $ 0.8  
Cross Currency Interest Rate Contract [Member]      
Derivative Instruments and Hedging Activities Disclosure [Line Items]      
Derivative Liability, Notional Amount 17.0 47.6  
Currency Swap [Member]      
Derivative Instruments and Hedging Activities Disclosure [Line Items]      
Derivative, Notional Amount 777.0 283.8  
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax $ (1.8) $ (14.5)  
Senior Notes 2.450% due 2019 | Senior Notes      
Derivative Instruments and Hedging Activities Disclosure [Line Items]      
Derivative, Amount of Hedged Item | €     € 136,600,000