Earnings Per Unit (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2013		2012
BASIC EARNINGS PER UNIT
Numerator:
Net income attributable to limited partners	$	753.5	$	651.3
Denominator:
Weighted-average number of distribution-bearing common units outstanding		881.6		856.6
Basic earnings per unit:
Net income attributable to limited partners	$	0.85	$	0.76
DILUTED EARNINGS PER UNIT
Numerator:
Net income attributable to limited partners	$	753.5	$	651.3
Denominator:
Weighted-average number of units outstanding:
Distribution-bearing common units		881.6		856.6
Class B units		4.5		4.5
Designated Units		23.7		26.1
Incremental option units		1.2		1.5
Total		911.0		888.7
Diluted earnings per unit:
Net income attributable to limited partners	$	0.83	$	0.73