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Financial Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Financial Instruments
     UNITED STATES DOLLAR  
     2017      2016  

Financial instruments are split per categories below and the accounting policies for financial instruments have been applied to these line items:

      

(a) Financial assets

      

Loans and receivables

      

- Environmental trust funds

      55.5        44.5  

- Trade and other receivables

      45.3        57.9  

- Cash and cash equivalents

      479.0        526.7  

Fair value through profit or loss

      

- Trade receivables from provisional copper and gold concentrate sales

      21.2        10.6  

Available for sale

      

- Investments

      99.1        13.8  

Derivative instruments

      

- Warrants

      5.5        5.9  

- Gold and oil derivative contracts

      25.0        —    

(b) Financial liabilities

      

Other financial liabilities

      

- Borrowings

      1,781.5        1,692.9  

- Trade and other payables

      451.0        459.3  

- South Deep dividend

      6.4        6.4  

Derivative instruments

      

- Copper derivative contracts

      3.3        —