Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	$ 39.9	$ 40.2
Total Derivative Liabilities	(9.8)	(16.9)
Net Derivatives	30.1	23.3
Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	18.2	11.4
Total Derivative Liabilities	(1.9)	(11.5)
Net Derivatives	16.3	(0.1)
Foreign Currency Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	19.9	16.3
Total Derivative Liabilities	(2.8)	(11.6)
Foreign Currency Forward Contracts [Member] | Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	18.2	11.4
Total Derivative Liabilities	(1.9)	(11.5)
Interest Rate and Currency Swap [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	20.0	23.9
Cross-Currency Swaps [Member]
Derivatives Fair Value [Line Items]
Total Derivative Liabilities	(7.0)	(5.3)
Cash Flow Hedge [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	21.7	28.8
Total Derivative Liabilities	(0.9)	(0.1)
Net Derivatives	20.8	28.7
Cash Flow Hedge [Member] | Foreign Currency Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	1.7	4.9
Total Derivative Liabilities	(0.9)	(0.1)
Cash Flow Hedge [Member] | Interest Rate and Currency Swap [Member]
Derivatives Fair Value [Line Items]
Foreign currency forward contracts	20.0	23.9
Net Investment Hedge [Member]
Derivatives Fair Value [Line Items]
Total Derivative Liabilities	(7.0)	(5.3)
Net Derivatives	(7.0)	(5.3)
Net Investment Hedge [Member] | Cross-Currency Swaps [Member]
Derivatives Fair Value [Line Items]
Total Derivative Liabilities	$ (7.0)	$ (5.3)