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Derivative Instruments - Fair Values of Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	$ (347.0)	$ (336.1)
Derivatives designated as hedging instruments [Member] \| Deferred charges and other [Member] \| Interest rate caps [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value
Derivatives not designated as hedging instruments [Member] \| Deferred charges and other [Member] \| Interest rate swaps [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value	$ (347.0)	$ (336.1)

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details