Earnings Per Unit (Tables)

12 Months Ended

Dec. 31, 2012

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 Year Ended December 31,
	2012		2011		2010
BASIC EARNINGS PER UNIT
Numerator:
Net income attributable to limited partners	$	2,419.9	$	2,046.9	$	320.8
Denominator:
Weighted-average number of distribution-bearing
common units outstanding		861.8		824.6		274.5
Basic earnings per unit:
Net income attributable to limited partners	$	2.81	$	2.48	$	1.17
DILUTED EARNINGS PER UNIT
Numerator:
Net income attributable to limited partners	$	2,419.9	$	2,046.9	$	320.8
Denominator:
Weighted-average number of units outstanding:
Distribution-bearing common units		861.8		824.6		274.5
Class B units		4.5		4.5		0.5
Designated Units		25.5		29.5		3.4
Incremental option units		1.4		1.3		0.1
Total		893.2		859.9		278.5
Diluted earnings per unit:
Net income attributable to limited partners	$	2.71	$	2.38	$	1.15