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Quarterly Financial Information (Unaudited)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information (Unaudited) [Abstract]  
Quarterly Financial Information (Unaudited)
Note 21.  Quarterly Financial Information (Unaudited)

The following table presents selected quarterly financial data for the periods presented:

 
 
First
Quarter
 
 
Second
Quarter
 
 
Third
Quarter
 
 
Fourth
Quarter
 
For the Year Ended December 31, 2012:
 
 
 
 
 
 
 
 
Revenues
 
$
11,252.5
 
 
$
9,789.8
 
 
$
10,468.7
 
 
$
11,072.1
 
Operating income
 
 
748.9
 
 
 
749.1
 
 
 
788.5
 
 
 
822.7
 
Net income
 
 
655.5
 
 
 
567.2
 
 
 
587.9
 
 
 
617.4
 
Net income attributable to limited partners
 
 
651.3
 
 
 
566.3
 
 
 
586.8
 
 
 
615.5
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Earnings per unit:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
 
$
0.76
 
 
$
0.66
 
 
$
0.68
 
 
$
0.70
 
Diluted
 
$
0.73
 
 
$
0.64
 
 
$
0.66
 
 
$
0.68
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
For the Year Ended December 31, 2011:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenues
 
$
10,183.7
 
 
$
11,216.5
 
 
$
11,327.1
 
 
$
11,585.7
 
Operating income
 
 
624.9
 
 
 
643.9
 
 
 
681.1
 
 
 
909.2
 
Net income
 
 
434.5
 
 
 
448.5
 
 
 
479.5
 
 
 
725.8
 
Net income attributable to limited partners
 
 
420.7
 
 
 
433.7
 
 
 
471.4
 
 
 
721.1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Earnings per unit:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
 
$
0.52
 
 
$
0.53
 
 
$
0.57
 
 
$
0.85
 
Diluted
 
$
0.49
 
 
$
0.51
 
 
$
0.55
 
 
$
0.82
 

The sum of our quarterly earnings per unit amounts may not equal our full year amounts due to slight rounding differences.