Summary of Net Gain (Loss) on Foreign Exchange Forwards Not Designated as Hedging Instruments and on Interest Rate Swaps Designated as Fair Value Hedges (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivatives Designated as Accounting Hedges [Member] | Interest Rate Swap [Member] | Interest Income (Expense), Net [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in income	$ 3.1	$ 4.1	$ 6.1	$ 7.6
Derivatives Not Designated as Accounting Hedges [Member] | Foreign Exchange Forward [Member] | Other Nonoperating Income (Expense) [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in income	$ (5.7)	$ 2.5	$ (5.2)	$ (1.9)