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Fair Value Measurement of Assets and Liabilities (Tables)
 3 Months Ended
Mar. 31, 2012
Fair Value Measurement of Assets and Liabilities [Abstract]  
Fair Value Measurement of Assets and Liabilities

The following assets and liabilities are recorded at fair value on a recurring basis (in millions):

 

                                 
    As of March 31, 2012  

Description

   Recorded
Balance		     Fair Value Measurements at Reporting Date
Using:		  
    Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)		     Significant
Other
Observable
Inputs
(Level 2)		     Significant
Unobservable
Inputs
(Level 3)		  

Assets

                                

Available-for-sale securities

                                

Corporate debt securities

   $ 331.4     $ —     $ 331.4     $ —  

U.S. government and agency debt securities

     200.4       —       200.4       —  

Foreign government debt securities

     2.8       —       2.8       —  

Commercial paper

     127.3       —       127.3       —  

Certificates of deposit

     90.1       —       90.1       —  
   

 

 

    

 

 

    

 

 

    

 

 

  

Total available-for-sale securities

     752.0       —       752.0       —  

Derivatives, current and long-term

                                

Foreign currency forward contracts and options

     16.7       —       16.7       —  

Interest rate swaps

     24.6       —       24.6       —  
   

 

 

    

 

 

    

 

 

    

 

 

  
    $ 793.3     $ —     $ 793.3     $ —  
   

 

 

    

 

 

    

 

 

    

 

 

  

Liabilities

                                

Derivatives, current and long-term

                                

Foreign currency forward contracts and options

   $ 10.3     $ —     $ 10.3     $ —  
   

 

 

    

 

 

    

 

 

    

 

 

  

 

                                 
    As of December 31, 2011  
          Fair Value Measurements at Reporting Date
Using:		  

Description

   Recorded
Balance		     Quoted
Prices in
Active
Markets for
Identical
Assets
(Level 1)		     Significant
Other
Observable
Inputs
(Level 2)		     Significant
Unobservable
Inputs
(Level 3)		  

Assets

                                

Available-for-sale securities

                                

Corporate debt securities

   $ 324.7     $ —     $ 324.7     $ —  

U.S. government and agency debt securities

     177.2       —       177.2       —  

Municipal bonds

     1.0       —       1.0       —  

Foreign government debt securities

     6.8       —       6.8       —  

Commercial paper

     74.5       —       74.5       —  

Certificates of deposit

     88.5       —       88.5       —  
   

 

 

    

 

 

    

 

 

    

 

 

  

Total available-for-sale securities

     672.7       —       672.7       —  

Derivatives, current and long-term

                                

Foreign currency forward contracts and options

     18.3       —       18.3       —  

Interest rate swaps

     27.8       —       27.8       —  
   

 

 

    

 

 

    

 

 

    

 

 

  
    $ 718.8     $ —     $ 718.8     $ —  
   

 

 

    

 

 

    

 

 

    

 

 

  

Liabilities

                                

Derivatives, current and long-term

                                

Foreign currency forward contracts and options

   $ 25.2     $ —     $ 25.2     $ —  

Cross-currency interest rate swaps

     8.2       —       8.2       —  
   

 

 

    

 

 

    

 

 

    

 

 

  
    $ 33.4     $ —     $ 33.4     $ —