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Net Earnings per Common Unit
 12 Months Ended
Dec. 31, 2013
Net Earnings per Common Unit  
Net Earnings per Common Unit

5.     Net Earnings per Common Unit

        Net earnings per common unit is based on the weighted-average number of common units outstanding during the period. The following table provides a calculation for net earnings per common unit for the years ended December 31, 2013, 2012 and 2011:

 
   Year ended December 31,  
 
   2013   2012   2011  
 
   (in millions, except per unit amounts)
  

Basic earnings per common unit:

                    

Net earnings

   $ 502.4   $ 560.8   $ 508.0  

Less: Net earnings allocable to General Partner

     205.7     239.7     219.4  

Less: Net earnings allocable to Class B Common Units

     4.9     5.5     5.0  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net earnings allocable to Common Units

   $ 291.8   $ 315.6   $ 283.6  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Weighted average units outstanding

     18.5     18.5     18.5  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net earnings per Common Unit

   $ 15.77   $ 17.06   $ 15.33  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

        There were no dilutive TNCLP units outstanding for the years ended December 31, 2013, 2012 and 2011.