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Deferred Income and Mining Tax Liabilities and Assets (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2010
Deferred income and mining tax liabilities      
Mining assets $ 1,803.8 $ 2,119.8 $ 1,978.0
Investments held by environmental trust funds 77.3 59.3 51.0
Inventory 9.3 9.3 8.9
Other 45.8   41.1
Gross deferred income and mining tax liabilities 1,936.2 2,188.4 2,079.0
Provisions, including rehabilitation accruals (149.0) (130.4) (122.3)
Tax losses (278.1) (515.0) (536.7)
Unredeemed capital expenditure (630.0) (648.6) (625.1)
Other (3.7) (21.6)  
Gross deferred income and mining tax assets (1,060.8) (1,315.6) (1,284.1)
Valuation allowance for deferred tax assets 152.4 192.5 195.3
Total deferred income and mining tax assets (908.4) (1,123.1) (1,088.8)
Net deferred income and mining tax liabilities 1,027.8 1,065.3 990.2
Less short term portion of deferred income and mining tax (included in accounts payable and provisions) (8.4) (13.5) (7.7)
Net deferred income and mining tax liabilities $ 1,019.4 $ 1,051.8 $ 982.5