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(Financial Instruments and Hedging Activities - Additional Information) (Detail)
$ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]  
Cumulative deferred hedging gain (loss), after tax, included in accumulated other comprehensive income $ 18.7
Interest Rate Swap  
Derivative Instruments and Hedging Activities Disclosure [Line Items]  
Derivative, notional amount 2,300.0
Intercompany Debt [Member]  
Derivative Instruments and Hedging Activities Disclosure [Line Items]  
Foreign currency denominated debt designated to hedge investments in certain foreign subsidiaries and affiliates 3,800.0
Debt [Member]  
Derivative Instruments and Hedging Activities Disclosure [Line Items]  
Foreign currency denominated debt designated to hedge investments in certain foreign subsidiaries and affiliates 10,100.0
Interest Rate Risk [Member] | Fair Value Hedging [Member]  
Derivative Instruments and Hedging Activities Disclosure [Line Items]  
Derivative instruments, gain (loss) recognized in income, net $ 1.0
Royalty Arrangement [Member]  
Derivative Instruments and Hedging Activities Disclosure [Line Items]  
Period covered by hedge 18 months
Derivative [Member]  
Derivative Instruments and Hedging Activities Disclosure [Line Items]  
Derivative, notional amount $ 791.5
Net Investment Hedging [Member]  
Derivative Instruments and Hedging Activities Disclosure [Line Items]  
Derivative, notional amount $ 897.5