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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2012
Fair Value Measurements [Abstract]  
Assets and Liabilities Measured at Fair Value on a Recurring Basis
                 
    Quoted Prices in Active Markets for
Identical Assets (Level 1)
 
    As of March 31,
2012
    As of December 31,
2011
 

Assets:

               

Investment in marketable equity securities (1)

  $ 8.6     $ 8.4  
Other Fair Value Measurements
                 
    As of March 31,
2012
    As of December 31,
2011
 

Senior unsecured notes

  $ 211.1     $ 207.0