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Investments in Marketable Securities
 3 Months Ended
Mar. 31, 2013
Investments in Marketable Securities  
Investments in Marketable Securities

3.     Investments in Marketable Securities

        Investments in marketable securities at December 31, 2012 and March 31, 2013 were $128.9 million and $135.5 million, respectively. These investments are comprised of the Company's investments in Value Partners Group Limited, a publicly-traded asset management firm based in Hong Kong, and investments held by Affiliates.

        The following is a summary of the cost, gross unrealized gains and losses and fair value of investments classified as available-for-sale and trading at December 31, 2012 and March 31, 2013:

 
   Available-for-Sale   Trading  
 
   December 31,
2012		   March 31,
2013		   December 31,
2012		   March 31,
2013		  

Cost

   $ 103.2   $ 99.2   $ 10.3   $ 16.3  

Unrealized Gains

     15.3     21.1     6.5     2.5  

Unrealized Losses

     (3.2 )   (3.6 )   (3.2 )   —  
                   

Fair Value

   $ 115.3   $ 116.7   $ 13.6   $ 18.8  
                   

        The following is a summary of the Company's realized gains and losses on investments classified as available-for-sale and trading:

 
   Available-for-Sale   Trading  
 
   For the Three Months
Ended March 31,		   For the Three Months
Ended March 31,		  
 
   2012   2013   2012   2013  

Gains

   $ —   $ 0.2   $ 0.5   $ 0.1  

Losses

     —     —     (0.3 )   —  
                   

Net realized gains

   $ —   $ 0.2   $ 0.2   $ 0.1