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Equity and Distributions (Tables)
 12 Months Ended
Dec. 31, 2017
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) outstanding.  The following table summarizes changes in the number of our outstanding units since January 1, 2015:

 
 
Common
Units
(Unrestricted)
  
Restricted
Common
Units
  
Total
Common
Units
 
Number of units outstanding at January 1, 2015
  
1,933,095,027
   
4,229,790
   
1,937,324,817
 
Common units issued in connection with ATM program
  
25,520,424
   
--
   
25,520,424
 
Common units issued in connection with DRIP and EUPP
  
12,793,913
   
--
   
12,793,913
 
Common units issued in connection with Step 2 of Oiltanking acquisition
  
36,827,517
   
--
   
36,827,517
 
Common units issued in connection with the vesting and exercise of unit options
  
396,158
   
--
   
396,158
 
Common units issued in connection with the vesting of phantom unit awards
  
618,395
   
--
   
618,395
 
Common units issued in connection with the vesting of restricted common unit awards
  
2,009,970
   
(2,009,970
)
  
--
 
Forfeiture of restricted common unit awards
  
--
   
(259,300
)
  
(259,300
)
Cancellation of treasury units acquired in connection with the vesting of
   equity-based awards
  
(683,954
)
  
--
   
(683,954
)
Other
  
15,054
   
--
   
15,054
 
Number of units outstanding at December 31, 2015
  
2,010,592,504
   
1,960,520
   
2,012,553,024
 
Common units issued in connection with ATM program
  
87,867,037
   
--
   
87,867,037
 
Common units issued in connection with DRIP and EUPP
  
16,316,534
   
--
   
16,316,534
 
Common units issued in connection with the vesting of phantom unit awards
  
1,761,455
   
--
   
1,761,455
 
Common units issued in connection with the vesting of restricted common unit awards
  
1,234,502
   
(1,234,502
)
  
--
 
Forfeiture of restricted common unit awards
  
--
   
(43,724
)
  
(43,724
)
Cancellation of treasury units acquired in connection with the vesting of
   equity-based awards
  
(1,000,619
)
  
--
   
(1,000,619
)
Other
  
134,707
   
--
   
134,707
 
Number of units outstanding at December 31, 2016
  
2,116,906,120
   
682,294
   
2,117,588,414
 
Common units issued in connection with ATM program
  
21,807,726
   
--
   
21,807,726
 
Common units issued in connection with DRIP and EUPP
  
19,046,019
   
--
   
19,046,019
 
Common units issued in connection with the vesting of phantom unit awards
  
2,485,580
   
--
   
2,485,580
 
Common units issued in connection with the vesting of restricted common unit awards
  
681,044
   
(681,044
)
  
--
 
Forfeiture of restricted common unit awards
  
--
   
(1,250
)
  
(1,250
)
Cancellation of treasury units acquired in connection with the vesting of
   equity-based awards
  
(1,027,798
)
  
--
   
(1,027,798
)
Common units issued in connection with employee compensation
  
1,176,103
   
--
   
1,176,103
 
Other
  
14,685
   
--
   
14,685
 
Number of units outstanding at December 31, 2017
  
2,161,089,479
   
--
   
2,161,089,479
 
Components of Accumulated Other Comprehensive Income (Loss)
The following tables present the components of accumulated other comprehensive income (loss) as reported on our Consolidated Balance Sheets at the dates indicated:
 
 
 
Gains (Losses) on
Cash Flow Hedges
       
 
 
Commodity
Derivative
Instruments
  
Interest Rate
Derivative
Instruments
  
Other
  
Total
 
Balance, December 31, 2015
 
$
56.6
  
$
(279.5
)
 
$
3.7
  
$
(219.2
)
Other comprehensive income (loss) before reclassifications
  
(193.8
)
  
42.3
   
(0.1
)
  
(151.6
)
Amounts reclassified from accumulated other comprehensive loss
  
53.4
   
37.4
   
--
   
90.8
 
Total other comprehensive income (loss)
  
(140.4
)
  
79.7
   
(0.1
)
  
(60.8
)
Balance, December 31, 2016
  
(83.8
)
  
(199.8
)
  
3.6
   
(280.0
)
Other comprehensive income (loss) before reclassifications
  
(38.5
)
  
(5.7
)
  
(0.1
)
  
(44.3
)
Amounts reclassified from accumulated other comprehensive loss
  
112.2
   
40.4
   
--
   
152.6
 
Total other comprehensive income (loss)
  
73.7
   
34.7
   
(0.1
)
  
108.3
 
Balance, December 31, 2017
 
$
(10.1
)
 
$
(165.1
)
 
$
3.5
  
$
(171.7
)
Reclassifications out of Accumulated Other Comprehensive Income (Loss) Into Net Income
The following table presents reclassifications out of accumulated other comprehensive income (loss) into net income during the periods indicated:
 
 
  
 
For the Year Ended December 31,
 
 
 Location 
2017
  
2016
 
Losses (gains) on cash flow hedges:
       
Interest rate derivatives
Interest expense
 
$
40.4
  
$
37.4
 
Commodity derivatives
Revenue
  
111.6
   
53.6
 
Commodity derivatives
Operating costs and expenses
  
0.6
   
(0.2
)
Total
 
 
$
152.6
  
$
90.8
 
Components of Net Income Attributable to Noncontrolling Interests
The following table presents the components of net income attributable to noncontrolling interests as presented on our Statements of Consolidated Operations for the periods indicated:

 
 
For the Year Ended December 31,
 
 
 
2017
  
2016
  
2015
 
Limited partners of Oiltanking other than EPO
 
$
--
  
$
--
  
$
7.8
 
Joint venture partners
  
56.3
   
39.9
   
29.4
 
Total
 
$
56.3
  
$
39.9
  
$
37.2
 
Cash Distributions Paid to and Cash Contributions Received From Noncontrolling Interests
The following table presents cash distributions paid to and cash contributions received from noncontrolling interests as presented on our Statements of Consolidated Cash Flows and Statements of Consolidated Equity for the periods indicated:

 
 
For the Year Ended December 31,
 
 
 
2017
  
2016
  
2015
 
Cash distributions paid to noncontrolling interests:
         
Limited partners of Oiltanking other than EPO
 
$
--
  
$
--
  
$
8.1
 
Joint venture partners
  
49.2
   
47.4
   
39.9
 
Total
 
$
49.2
  
$
47.4
  
$
48.0
 
             
Cash contributions from noncontrolling interests:
            
Joint venture partners
 
$
0.4
  
$
20.4
  
$
54.0
 
Declared Quarterly Cash Distribution Rates
The following table presents Enterprise’s declared quarterly cash distribution rates per common unit with respect to the quarter indicated.  Actual cash distributions are paid by Enterprise within 45 days after the end of each fiscal quarter.

 
 
Distribution Per
Common Unit
 
Record
Date
Payment
Date
2015:
   
 
   
1st Quarter
 
$
0.3750
 
4/30/2015
5/7/2015
2nd Quarter
 
$
0.3800
 
7/31/2015
8/7/2015
3rd Quarter
 
$
0.3850
 
10/30/2015
11/6/2015
4th Quarter
 
$
0.3900
 
1/29/2016
2/5/2016
2016:
         
1st Quarter
 
$
0.3950
 
4/29/2016
5/6/2016
2nd Quarter
 
$
0.4000
 
7/29/2016
8/5/2016
3rd Quarter
 
$
0.4050
 
10/31/2016
11/7/2016
4th Quarter
 
$
0.4100
 
1/31/2017
2/7/2017
2017:
    
 
    
1st Quarter
 
$
0.4150
 
4/28/2017
5/8/2017
2nd Quarter
 
$
0.4200
 
7/31/2017
8/7/2017
3rd Quarter
 
$
0.4225
 
10/31/2017
11/7/2017
4th Quarter
 
$
0.4250
 
1/31/2018
2/7/2018