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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2011
Fair Value Measurements [Abstract]  
Fair value of plan assets
                                 
    Fair Value Measurements at December 31,  
    Total     Quoted Prices in
Active markets for
Identical Assets
(Level 1)
    Significant Other
Observable Inputs
(Level 2)
    Significant
Unobservable
Inputs
(Level 3)
 

2011

                               

Oil Derivatives

  $ 0.1     $ —       $ 0.1     $ —    
         

2010

                               

Natural Gas Derivatives

  $ 0.3     $ —       $ 0.3     $ —