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Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2011
Financial Instruments [Abstract]  
Schedule of carrying amount and estimated fair values
The carrying amount and estimated fair values of the Partnership’s financial instruments as of June 30, 2011 and December 31, 2010, were as follows (in millions):

   
June 30, 2011
  
December 31, 2010
 
Financial Assets
 
Carrying Amount
  
Fair Value
  
Carrying Amount
  
Fair Value
 
Cash and cash equivalents
 $53.9  $53.9  $55.0  $55.0 
                  
Financial Liabilities
                
Long-term debt
 $3,022.3  $3,196.8  $3,152.3  $3,314.3 
Long-term debt – affiliate
  100.0   108.9   100.0   106.3