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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2011
Fair Value Disclosures [Abstract] 
Assets and Liabilities Measured at Fair Value on a Recurring Basis
                 
    Quoted Prices in Active Markets for  
    Identical Assets (Level 1)  
    As of September 30,     As of December 31,  
    2011     2010  
Assets:
               
Investment in marketable equity securities (1)
  $ 7.7     $ 18.0  
 
(1)   Investment in marketable equity securities is recorded in Other Assets, net in the accompanying Consolidated Balance Sheets.
Other Fair Value Measurements
                 
    As of September 30,     As of December 31,  
    2011     2010  
Long-term debt (1)
  $ 293.9     $ 114.6  
Senior unsecured notes
    217.9       203.0  
 
(1)   Long-term debt includes our domestic revolving credit facility, capital lease obligations, and any related current maturities.