Earnings Per Unit (Tables)

3 Months Ended

Mar. 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 presented:

	For the Three Months Ended March 31,
	2012		2011
BASIC EARNINGS PER UNIT
Numerator:
Net income attributable to limited partners	$	651.3	$	420.7
Denominator:
Common units		852.3		809.9
Time-vested restricted common units		4.3		4.0
Total		856.6		813.9
Basic earnings per unit:
Net income attributable to limited partners	$	0.76	$	0.52
DILUTED EARNINGS PER UNIT
Numerator:
Net income attributable to limited partners	$	651.3	$	420.7
Denominator:
Common units		852.3		809.9
Time-vested restricted common units		4.3		4.0
Class B units		4.5		4.5
Designated Units		26.1		30.6
Incremental option units		1.5		1.3
Total		888.7		850.3
Diluted earnings per unit:
Net income attributable to limited partners	$	0.73	$	0.49