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Reconciliation of Total Liability for Environmental Rehabilitation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Provision for environmental rehabilitation
Opening balance	$ 300.1	$ 269.2
Change in estimates	(6.2)	36.7
Liabilities settled	(9.8)	(2.8)
Accretion of liability	13.9	15.4	$ 10.4
Foreign currency translation adjustment	(22.3)	(18.4)
Closing balance	$ 275.7	$ 300.1	$ 269.2

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Provision for long-term cash incentive plan changes in estimates.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
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Amount of the Increase or Decrease in the amount of asset retirement obligations for the period associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability).

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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-Section 50
-Paragraph 1
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Amount of a reclamation and mine closing liability that is associated with a legal obligation for the closure and reclamation of a mine including the removal of buildings, equipment, machinery and other physical remnants of mining, closure of tailings impoundments, leach pads and other mine features, and contouring, covering and revegetation of waste rock piles and other disturbed areas.

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-Subparagraph (SAB TOPIC 5.Y.Q2)
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