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Earnings Per Unit (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Unit [Abstract]  
Basic and Diluted Earnings Per Unit
The following table presents our calculation of basic and diluted earnings per unit for the periods indicated:

 
 
For the Three Months
Ended June 30,
  
For the Six Months
Ended June 30,
 
 
 
2018
  
2017
  
2018
  
2017
 
BASIC EARNINGS PER UNIT
            
Net income attributable to limited partners
 
$
673.8
  
$
653.7
  
$
1,574.5
  
$
1,414.4
 
Undistributed earnings allocated and cash payments on phantom unit awards (1)
  
(4.6
)
  
(4.0
)
  
(9.3
)
  
(8.0
)
Net income available to common unitholders
 
$
669.2
  
$
649.7
  
$
1,565.2
  
$
1,406.4
 
 
                
Basic weighted-average number of common units outstanding
  
2,174.6
   
2,144.7
   
2,170.7
   
2,135.5
 
 
                
Basic earnings per unit
 
$
0.31
  
$
0.30
  
$
0.72
  
$
0.66
 
 
                
DILUTED EARNINGS PER UNIT
                
Net income attributable to limited partners
 
$
673.8
  
$
653.7
  
$
1,574.5
  
$
1,414.4
 
 
                
Diluted weighted-average number of units outstanding:
                
Distribution-bearing common units
  
2,174.6
   
2,144.7
   
2,170.7
   
2,135.5
 
Phantom units (1)
  
10.8
   
9.6
   
10.6
   
9.2
 
Total
  
2,185.4
   
2,154.3
   
2,181.3
   
2,144.7
 
 
                
Diluted earnings per unit
 
$
0.31
  
$
0.30
  
$
0.72
  
$
0.66
 
  
(1)   Each phantom unit award includes a distribution equivalent right (“DER”), which entitles the recipient to receive cash payments equal to the product of the number of phantom unit awards and the cash distribution per unit paid to our common unitholders. Cash payments made in connection with DERs are nonforfeitable. As a result, the phantom units are considered participating securities for purposes of computing basic earnings per unit.