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Debt (Tables)
6 Months Ended
Jun. 30, 2011
Debt [Abstract]  
Long-term debt
                 
    June 30,     December 31,  
    2011     2010  
Senior Notes,
               
$450.0 million 5.000% notes due August 14, 2014 (the “2014 Notes”)
  $ 450.0     $ 450.0  
$400.0 million 6.125% notes due August 14, 2019 (the “2019 Notes”) together the “Senior Notes”
    400.0       400.0  
 
           
 
    850.0       850.0  
Less: Unamortized discount
    (1.9 )     (2.1 )
 
           
Senior Notes, net
    848.1       847.9  
Senior Credit Facility with Canadian Imperial Bank of Commerce, Wachovia Capital Markets, LLC and a syndicate of banks (“2006 Credit Facility”), due 2011
    250.0        
Mandatorily Redeemable Preferred Stock
    174.6       166.4  
Other notes payable
    1.8       1.8  
 
           
 
    1,274.5       1,016.1  
Less: Current portion
    250.0          
 
           
Total long-term debt
  $ 1,024.5     $ 1,016.1