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Asset Retirement Obligations - Summary of Aros by Country (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Asset Retirement Obligation [Line Items]
Australia	$ 102.3	$ 30.1
Australia
Asset Retirement Obligation [Line Items]
Australia	57.0
South Africa
Asset Retirement Obligation [Line Items]
Australia	34.0
Botlek
Asset Retirement Obligation [Line Items]
Australia	10.2
Hamilton
Asset Retirement Obligation [Line Items]
Australia	$ 1.1

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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