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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Measurements  
Schedule of assets and liabilities measured on a recurring basis, at fair value

 

 

 
  December 31, 2011  
 
  Level 1   Level 2   Level 3   Total  

Treasury bills

  $ 70.2   $ 20.0   $   $ 90.2  

FDIC insured corporate bonds

    187.5             187.5  

Commercial paper

    15.9     81.2         97.1  

Money market instruments

        0.2         0.2  
                   

Total

  $ 273.6   $ 101.4   $   $ 375.0  
                   

 

 
  December 31, 2010  
 
  Level 1   Level 2   Level 3   Total  

Treasury bills

  $ 136.2   $ 79.5   $   $ 215.7  

FDIC insured corporate bonds

    129.4             129.4  

Commercial paper

    128.6     62.8         191.4  

Money market instruments

        0.6         0.6  

Derivative instrument

        0.3         0.3  
                   

Total

  $ 394.2   $ 143.2   $   $ 537.4  
                   
Schedule of assets and liabilities measured on a nonrecurring basis, at fair value

 

 

 
  December 31, 2011  
 
  Level 1   Level 2   Level 3   Total  

Property, plant and equipment, net

  $   $   $ 86.1   $ 86.1  

Goodwill

            55.8     55.8  

Intangible assets, net

            25.9     25.9  
                   

Total

  $   $   $ 167.8   $ 167.8  
                   


 

 
  December 31, 2010  
 
  Level 1   Level 2   Level 3   Total  

Property, plant and equipment, net

  $   $   $ 42.3   $ 42.3  

Goodwill

            52.0     52.0  

Intangible assets, net

            16.9     16.9  
                   

Total

  $   $   $ 111.2   $ 111.2