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Noncontrolling Interest
12 Months Ended
Dec. 31, 2012
Noncontrolling Interest [Abstract]  
Noncontrolling Interest
(11)          Noncontrolling Interest

In January 2011, we acquired the remaining noncontrolling interest in Volclay South Africa (Proprietary) Limited ("VSA"), a part of our chromite operations, for approximately $5.6.

In February 2011, we sold 26% of our interest in Batlhako Mining Limited ("Batlhako") to Vengawave (Proprietary) Limited, which is a Black Economic Empowerment enterprise (a "BEE") in the Republic of South Africa. Batlhako is VSA's subsidiary dedicated strictly to mining chromite and selling it to one of our other subsidiaries for further processing and sale to the end customer. South African law requires that we have a BEE as a partner in the mining operations and this transaction was consummated to comply with those regulations.
 
The following table sets forth the effects of these transactions on equity attributable to AMCOL's shareholders.

   
Twelve Months Ended December 31,
 
   
2012
  
2011
 
Net income attributable to AMCOL shareholders
 $65.1  $58.5 
Transfers from noncontrolling interest:
        
Decrease in additional paid-in capital for purchase of the remaining noncontrolling interest in South Africa (Proprietary) Limited
  -   (5.4)
Decrease in additional paid-in capital for transfer of 26% interest in Batlhako
  -   (3.4)
Change from net income attributable to AMCOL shareholders and transfers from noncontrolling interest
 $65.1  $49.7