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	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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	$ 15.2	$ 11.7	$ 4.2
Derivatives Not Designated as Accounting Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in income	(11.8)	(2.0)
Derivatives Not Designated as Accounting Hedges [Member] | Foreign Exchange Forwards [Member] | Other Nonoperating Income [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in income	(2.8)	$ (2.0)	$ (2.1)
Derivatives Not Designated as Accounting Hedges [Member] | Cross-Currency Swap [Member] | Other Nonoperating Income [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of gain (loss) recognized in income	$ (9.0)