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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly Financial Information (Unaudited) [Abstract]  
Quarterly Financial Information (Unaudited)
The following table presents selected quarterly financial data for the periods indicated:

 
 
First
Quarter
  
Second
Quarter
  
Third
Quarter
  
Fourth
Quarter
 
For the Year Ended December 31, 2015:
 
  
  
  
 
Revenues
 
$
7,472.5
  
$
7,092.5
  
$
6,307.9
  
$
6,155.0
 
Operating income
  
896.0
   
800.3
   
909.4
   
934.5
 
Net income
  
650.6
   
556.6
   
657.7
   
693.5
 
Net income attributable to limited partners
  
636.1
   
551.0
   
649.3
   
684.8
 
 
                
Earnings per unit:
                
Basic
 
$
0.33
  
$
0.28
  
$
0.33
  
$
0.34
 
Diluted
 
$
0.32
  
$
0.28
  
$
0.32
  
$
0.34
 
 
                
For the Year Ended December 31, 2014:
                
Revenues
 
$
12,909.9
  
$
12,520.8
  
$
12,330.2
  
$
10,190.3
 
Operating income
  
1,032.7
   
884.3
   
937.7
   
921.0
 
Net income
  
806.7
   
646.5
   
699.2
   
681.1
 
Net income attributable to limited partners
  
798.8
   
637.7
   
691.1
   
659.8
 
 
                
Earnings per unit:
                
Basic
 
$
0.44
  
$
0.35
  
$
0.38
  
$
0.35
 
Diluted
 
$
0.43
  
$
0.34
  
$
0.37
  
$
0.34