(Financial Instruments and Hedging Activities - Additional Information) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Cumulative deferred hedging gain (loss), after tax, included in accumulated other comprehensive income	$ (1.4)
Foreign currency denominated royalties
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Period covered by hedge	18 months
Derivative, notional amount	$ 676.5
Net Investment Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, notional amount	297.7
Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative, notional amount	2,200.0
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	3,300.0
Debt [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Foreign currency denominated debt designated to hedge investments in certain foreign subsidiaries and affiliates	8,400.0
Interest Rate Risk [Member] | Fair Value Hedging [Member]
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Derivative instruments, gain (loss) recognized in income, net	$ (2.2)