Effect of Derivative Instruments on Condensed Consolidated Statement of Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	$ 13.6	[1]	$ 8.4	[1]	$ 8.3	[1]	$ 11.4	[2]
Designated as Hedging Instrument [Member] | Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total			1.3	[1]	0.4	[1]	3.6	[2]
Designated as Hedging Instrument [Member] | Foreign currency forward contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total			(0.1)	[1],[3]	(0.1)	[1],[3]
Not Designated as Hedging Instrument [Member] | Foreign currency forward contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net, Total	$ 13.6	[1],[3]	$ 7.2	[1],[3]	$ 8.0	[1],[3]	$ 7.8	[2],[3]

[1] Amounts recognized on the foreign currency forward contracts were included in other income (expense), net. Amounts recognized on the interest rate swaps were included in interest expense.

[2] Asset derivatives are included in other assets and liability derivatives are included in other liabilities.

[3] The net gains and (losses) included above were substantially offset by the net (losses) and gains resulting from the remeasurement of the underlying foreign currency denominated items, which are included in other expense, net, on the condensed consolidated statement of operations. The underlying foreign currency denominated items include third party and intercompany receivables and payables and interest-bearing intercompany loans. See "Foreign Currency Forward Contracts Not Designated as Hedges" above for further information.