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Summary of Results of Discontinued Operations (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Product sales $ 310.7 $ 2,021.2 $ 2,301.0
Costs and expenses (285.7) (1,737.8) (1,797.6)
Income before tax and share of equity investee's profits 25.0 283.4 503.4
Income and mining tax expense (5.4) 67.5 (167.5)
Income before share of equity investee's profits 19.6 350.9 335.9
Share of equity investee's profits 0.9 11.4 4.8
Net income 20.5 362.3 340.7
Property, plant and equipment, net 1,987.3    
Non-current investments 187.0    
Current assets 285.4    
Current liabilities (234.8)    
Non-current liabilities (1,191.2)    
Net carrying value 1,033.7    
Net asset value distributed (1,033.7)    
Profit on distribution