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Subsequent Event
 6 Months Ended
Jun. 30, 2014
Subsequent Event [Abstract]  
Subsequent Event
Note 18.  Subsequent Event
Two-for-One Split of Limited Partner Units
 
On July 15, 2014, we announced that our general partner approved a two-for-one split of our common units.  The common unit split will be accomplished by distributing one additional common unit for each common unit outstanding.  The additional common units will be distributed on August 21, 2014 to holders of record as of the close of business on August 14, 2014.

All per unit amounts and number of units outstanding in these Unaudited Condensed Consolidated Financial Statements and Notes thereto are presented on a pre-split basis.  As a result of the common unit split, all historical per unit data and number of units outstanding presented in future financial statements will be retroactively adjusted.

The following table presents pro forma earnings per unit (giving retroactive effect solely to the unit split) for the periods indicated:

 
For the Three Months
For the Six Months
 
Ended June 30,
Ended June 30,
 
2014
2013
2014
2013
Net income available to common unitholders (see Note 13)
$
636.5
$
552.5
$
1,433.8
$
1,306.0
 
Basic earnings per unit:
   Weighted-average number of common units outstanding, as reported
915.5
889.1
914.8
885.4
   Weighted-average number of common units outstanding, pro forma
1,831.0
1,778.2
1,829.6
1,770.8
   Basic earnings per unit, as reported
$
0.70
$
0.62
$
1.57
$
1.48
   Basic earnings per unit, pro forma
$
0.35
$
0.31
$
0.78
$
0.74
 
Diluted earnings per unit:
   Weighted-average number of common units outstanding, as reported
940.2
918.5
939.1
914.8
   Weighted-average number of common units outstanding, pro forma
1,880.4
1,837.0
1,878.2
1,829.6
   Diluted earnings per unit, as reported
$
0.68
$
0.60
$
1.53
$
1.43
   Diluted earnings per unit, pro forma
$
0.34
$
0.30
$
0.76
$
0.71