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Earnings Per Unit (Tables)
 6 Months Ended
Jun. 30, 2013
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,
 
 
 
2013
 
 
2012
 
 
2013
 
 
2012
 
BASIC EARNINGS PER UNIT
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
 
Net income attributable to limited partners
 
$
552.5
 
 
$
566.3
 
 
$
1,306.0
 
 
$
1,217.6
 
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average number of distribution-bearing common units outstanding
 
 
889.1
 
 
 
857.9
 
 
 
885.4
 
 
 
857.3
 
Basic earnings per unit:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income attributable to limited partners
 
$
0.62
 
 
$
0.66
 
 
$
1.48
 
 
$
1.42
 
DILUTED EARNINGS PER UNIT
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income attributable to limited partners
 
$
552.5
 
 
$
566.3
 
 
$
1,306.0
 
 
$
1,217.6
 
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted-average number of units outstanding:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Distribution-bearing common units
 
 
889.1
 
 
 
857.9
 
 
 
885.4
 
 
 
857.3
 
Class B units
 
 
4.5
 
 
 
4.5
 
 
 
4.5
 
 
 
4.5
 
Designated Units
 
 
23.7
 
 
 
26.1
 
 
 
23.7
 
 
 
26.1
 
Incremental option units
 
 
1.2
 
 
 
1.4
 
 
 
1.2
 
 
 
1.4
 
Total
 
 
918.5
 
 
 
889.9
 
 
 
914.8
 
 
 
889.3
 
Diluted earnings per unit:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net income attributable to limited partners
 
$
0.60
 
 
$
0.64
 
 
$
1.43
 
 
$
1.37