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Property, Plant and Equipment (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Cost $ 7,731.7 $ 12,868.5
Accumulated depreciation and amortization (2,798.7) (5,479.6)
Property, plant and equipment, net 4,933.0 7,388.9
Cumulative capitalized interest, net of amortization 142.1 130.6
Tarkwa Mine
    
Property, Plant and Equipment [Line Items]    
Cumulative capitalized interest, net of amortization 12.9 13.5
Cerro Corona
    
Property, Plant and Equipment [Line Items]    
Cumulative capitalized interest, net of amortization 67.6 71.6
South Africa
    
Property, Plant and Equipment [Line Items]    
Cumulative capitalized interest, net of amortization 61.6 45.5
Mining Properties, Mine Development Costs, Mine Plant Facilities and Mineral Interest
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 4,594.5 6,344.5
Asset Retirement Costs
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 86.4 119.3
Other Non-Mining Assets
    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net $ 252.1 $ 925.1