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Equity and Distributions (Tables)
 6 Months Ended
Jun. 30, 2013
Equity and Distributions [Abstract]  
Summary of Changes in Outstanding Units
Partners' equity reflects the various classes of limited partner interests (i.e., common units, including restricted common units, and Class B units) that we have outstanding.  The following table summarizes changes in the number of our common units outstanding during the six months ended June 30, 2013:

 
 
Common
Units
(Unrestricted)
 
 
Restricted
Common
Units
 
 
Total
Common
Units
 
Number of units outstanding at December 31, 2012
 
 
894,919,851
 
 
 
3,893,486
 
 
 
898,813,337
 
Common units issued in connection with underwritten offering
 
 
9,200,000
 
 
 
--
 
 
 
9,200,000
 
Common units issued in connection with our at-the-market program
 
 
3,766,557
 
 
 
--
 
 
 
3,766,557
 
Common units issued in connection with our DRIP and EUPP
 
 
2,440,784
 
 
 
--
 
 
 
2,440,784
 
Common units issued in connection with the vesting of unit options
 
 
200,882
 
 
 
--
 
 
 
200,882
 
Common units issued in connection with the vesting of restricted common unit awards
 
 
1,830,010
 
 
 
(1,830,010
)
 
 
--
 
Restricted common unit awards issued
 
 
--
 
 
 
1,748,476
 
 
 
1,748,476
 
Forfeiture of restricted common unit awards
 
 
--
 
 
 
(120,882
)
 
 
(120,882
)
Acquisition and cancellation of treasury units in connection with the vesting of equity-based awards
 
 
(614,191
)
 
 
--
 
 
 
(614,191
)
Number of units outstanding at June 30, 2013
 
 
911,743,893
 
 
 
3,691,070
 
 
 
915,434,963
 
Reclassification out of Accumulated Other Comprehensive Income (Loss)
The following table presents reclassifications out of accumulated other comprehensive income (loss) into net income during the three and six months ended June 30, 2013:
Location
 
For the Three Months Ended
June 30, 2013
 
 
For the Six
Months Ended
June 30, 2013
 
Losses (gains) on cash flow hedges:
 
 
 
 
 
   Interest rate derivatives
Interest expense
 
$
7.8
 
 
$
13.7
 
   Commodity derivatives
Revenue
 
 
(7.2
)
 
 
0.5
 
   Commodity derivatives
Operating costs and expenses
 
 
--
 
 
 
(0.4
)
      Total
 
 
$
0.6
 
 
$
13.8
 
Declared Quarterly Cash Distribution Rates
The following table presents our declared quarterly cash distribution rates per common unit with respect to the quarters indicated:

 
 
Distribution Per
Common Unit
 
Record
Date
Payment
Date
2013
 
 
 
   
1st Quarter
 
$
0.67
 
04/30/13
05/07/13
2nd Quarter
 
$
0.68
 
07/31/13
08/07/13