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Net Earnings per Common Unit (Tables)
 6 Months Ended
Jun. 30, 2014
Net Earnings per Common Unit  
Schedule of calculation for net earnings per common unit

  Three months ended
June 30,		   Six months ended
June 30,		  
 
   2014   2013   2014   2013  
 
   (in millions, except per unit amounts)
  

Basic earnings per Common Unit:

                          

Net earnings

   $ 100.1   $ 149.3   $ 203.0   $ 316.1  

Net earnings allocable to General Partner

     (40.7 )   (63.8 )   (82.2 )   (136.8 )

Net earnings allocable to Class B Common Units

     (1.0 )   (1.5 )   (2.0 )   (3.1 )
                   
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Net earnings allocable to Common Units

   $ 58.4   $ 84.0   $ 118.8   $ 176.2  
                   
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Weighted average units outstanding

     18.5     18.5     18.5     18.5  
                   
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Net earnings per Common Unit

   $ 3.16   $ 4.54   $ 6.42   $ 9.52  
                   
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