Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	$ 33.6	$ 72.2
Total Derivative Liabilities	(37.9)	(56.8)
Net Derivatives	(4.3)	15.4
Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	6.3	25.0
Total Derivative Liabilities	(6.4)	(43.5)
Net Derivatives	(0.1)	(18.5)
Foreign Currency Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	10.5	28.2
Total Derivative Liabilities	(8.7)	(44.8)
Foreign Currency Forward Contracts [Member] | Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	6.3	25.0
Total Derivative Liabilities	(6.4)	(43.5)
Interest Rate and Currency Swap [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	23.1	44.0
Cross-Currency Swaps [Member]
Derivatives Fair Value [Line Items]
Total Derivative Liabilities	(29.2)	(12.0)
Cash Flow Hedge [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	27.3	47.2
Total Derivative Liabilities	(2.3)	(1.3)
Net Derivatives	25.0	45.9
Cash Flow Hedge [Member] | Foreign Currency Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	4.2	3.2
Total Derivative Liabilities	(2.3)	(1.3)
Cash Flow Hedge [Member] | Interest Rate and Currency Swap [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	23.1	44.0
Net Investment Hedge [Member]
Derivatives Fair Value [Line Items]
Total Derivative Liabilities	(29.2)	(12.0)
Net Derivatives	(29.2)	(12.0)
Net Investment Hedge [Member] | Cross-Currency Swaps [Member]
Derivatives Fair Value [Line Items]
Total Derivative Liabilities	$ (29.2)	$ (12.0)