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Investments in Marketable Securities (Tables)
3 Months Ended
Mar. 31, 2013
Investments in Marketable Securities  
Summary of the cost, gross unrealized gains and losses and fair value of investments classified as available-for-sale and trading

 

 
  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  
                   
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