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Fair Value Measurements
3 Months Ended
Mar. 31, 2012
Fair Value Measurements [Abstract]  
Fair Value Measurements

8. Fair Value Measurements

The following table summarizes assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2012 and December 31, 2011:

 

     March 31, 2012     December 31, 2011  
     Fair Value Asset (Liability)     Fair Value Asset (Liability)  

(in millions)

   Level 1      Level 2     Total     Level 1      Level 2     Total  

Derivatives:

                 

Assets

   $ —         $ 0.7      $           0.7      $ —         $ 4.4      $ 4.4   

Liabilities

     —           (7.5        (7.5     —           (8.6     (8.6

Available for sale securities

     —           21.0           21.0        —           19.5        19.5   

Derivative assets and liabilities relate to interest rate swaps, foreign currency contracts and commodity contracts. Fair values are determined by the Company using market prices obtained from independent brokers or determined using valuation models that use as their basis readily observable market data that is actively quoted and can be validated through external sources, including independent pricing services, brokers and market transactions. Available-for-sale securities include inflation protected bonds and are valued based on quoted market prices.