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Debt
9 Months Ended
Sep. 30, 2011
Debt [Abstract] 
Debt
7.

Debt

We had no short-term debt as of September 30, 2011 or December 31, 2010. Long-term debt as of September 30, 2011 and December 31, 2010 on our condensed consolidated balance sheet consisted of the following (in millions):

                 
    September 30,
2011
    December 31,
2010
 

Senior Notes due 2019

  $ 500.0     $ 500.0  

Senior Notes due 2039

    500.0       500.0  

Debt discount

    (1.2     (1.2

Adjustment related to interest rate swaps

    26.7       1.5  

Senior Credit Facility

    518.0       141.8  
   

 

 

   

 

 

 

Total long-term debt

  $ 1,543.5     $ 1,142.1  
   

 

 

   

 

 

 

The estimated fair value of our senior notes as of September 30, 2011, based on quoted prices for the specific securities from transactions in over-the-counter markets, was $1,139.0 million. The carrying value of our senior credit facility approximates fair value, as the underlying instruments have variable interest rates at market value.