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Unredeemed Capital Expenditure (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Tax Credit Carryforward [Line Items]    
Unredeemed capital expenditure $ 2,179.3 $ 2,531.9
GFI Joint Venture Holdings    
Tax Credit Carryforward [Line Items]    
Disallowance amount of SARS 1,014.2  
Unredeemed capital expenditure [1] $ 1,586.0 $ 1,822.6
[1] During 2014, the South African Revenue Services ("SARS") issued a Finalisation of Audit Letter ("the Audit Letter") stating that SARS had disallowed $1,014.2 million of GFIJVH's recognised capital allowance of $1,586.0 million. The company has not received an assessment from SARS disallowing the $1 014.2 million and the company believes it is more likely than not it has a defendable position over this matter.