Derivatives and Hedging Activities - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivatives Fair Value [Line Items]
Total Derivative Assets	$ 74.7	$ 63.4
Total Derivative Liabilities	(58.4)	(68.0)
Net Derivatives	16.3	(4.6)
Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Total Derivative Assets	27.7	41.3
Total Derivative Liabilities	(35.8)	(67.6)
Net Derivatives	(8.1)	(26.3)
Foreign Currency Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Total Derivative Assets	33.7	45.6
Total Derivative Liabilities	(36.2)	(68.0)
Foreign Currency Forward Contracts [Member] | Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Total Derivative Assets	27.6	41.3
Total Derivative Liabilities	(35.8)	(67.6)
Interest Rate and Currency Swap [Member]
Derivatives Fair Value [Line Items]
Total Derivative Assets	40.9	17.8
Foreign Currency Option Contracts [Member]
Derivatives Fair Value [Line Items]
Total Derivative Assets	0.1
Foreign Currency Option Contracts [Member] | Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Total Derivative Assets	0.1
Cross-Currency Swaps [Member]
Derivatives Fair Value [Line Items]
Total Derivative Liabilities	(22.2)
Cash Flow Hedge [Member]
Derivatives Fair Value [Line Items]
Total Derivative Assets	47.0	22.1
Total Derivative Liabilities	(0.4)	(0.4)
Net Derivatives	46.6	21.7
Cash Flow Hedge [Member] | Foreign Currency Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Total Derivative Assets	6.1	4.3
Total Derivative Liabilities	(0.4)	(0.4)
Cash Flow Hedge [Member] | Interest Rate and Currency Swap [Member]
Derivatives Fair Value [Line Items]
Total Derivative Assets	40.9	$ 17.8
Net Investment Hedge [Member]
Derivatives Fair Value [Line Items]
Total Derivative Liabilities	(22.2)
Net Derivatives	(22.2)
Net Investment Hedge [Member] | Cross-Currency Swaps [Member]
Derivatives Fair Value [Line Items]
Total Derivative Liabilities	$ (22.2)