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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies [Abstract]  
Summary of Contractual Obligations
The following table summarizes our various contractual obligations at December 31, 2015.  A description of each type of contractual obligation follows:

 
 
Payment or Settlement due by Period
 
Contractual Obligations
 
Total
  
2016
  
2017
  
2018
  
2019
  
2020
  
Thereafter
 
Scheduled maturities of debt obligations
 
$
22,738.5
  
$
1,864.1
  
$
800.0
  
$
1,100.0
  
$
1,500.0
  
$
1,500.0
  
$
15,974.4
 
Estimated cash interest payments
 
$
21,734.1
  
$
1,053.0
  
$
1,036.1
  
$
975.6
  
$
917.5
  
$
859.7
  
$
16,892.2
 
Operating lease obligations
 
$
494.0
  
$
64.2
  
$
58.4
  
$
50.3
  
$
44.7
  
$
41.0
  
$
235.4
 
Purchase obligations:
                            
Product purchase commitments:
                            
Estimated payment obligations:
                            
Natural gas
 
$
1,160.8
  
$
451.3
  
$
215.6
  
$
215.6
  
$
143.8
  
$
73.5
  
$
61.0
 
NGLs
 
$
376.9
  
$
319.3
  
$
21.8
  
$
23.9
  
$
11.9
  
$
--
  
$
--
 
Crude oil
 
$
441.5
  
$
389.4
  
$
17.9
  
$
17.9
  
$
16.3
  
$
--
  
$
--
 
Petrochemicals & refined products
 
$
1,921.4
  
$
1,868.6
  
$
52.8
  
$
--
  
$
--
  
$
--
  
$
--
 
Other
 
$
33.2
  
$
8.7
  
$
6.9
  
$
4.1
  
$
4.1
  
$
2.7
  
$
6.7
 
Underlying major volume commitments:
                            
Natural gas (in TBtus)
  
647
   
243
   
128
   
128
   
81
   
37
   
30
 
NGLs (in MMBbls)
  
39
   
30
   
3
   
4
   
2
   
--
   
--
 
Crude oil (in MMBbls)
  
14
   
11
   
1
   
1
   
1
   
--
   
--
 
Petrochemicals & refined products (in MMBbls)
  
146
   
126
   
20
   
--
   
--
   
--
   
--
 
Service payment commitments
 
$
685.9
  
$
184.5
  
$
160.1
  
$
91.8
  
$
71.1
  
$
43.7
  
$
134.7
 
Capital expenditure commitments
 
$
113.9
  
$
113.9
  
$
--
  
$
--
  
$
--
  
$
--
  
$
--
 
Schedule of Other Liabilities
The following table summarizes the components of "Other long-term liabilities" as presented on Consolidated Balance Sheets at the dates indicated:

 
 
December 31,
 
 
 
2015
  
2014
 
Noncurrent portion of AROs (see Note 5)
 
$
52.9
  
$
83.2
 
Deferred revenues – non-current portion (see Note 3)
  
78.3
   
73.0
 
Liquidity Option Agreement (see Note 12)
  
245.1
   
219.7
 
Centennial guarantees
  
6.1
   
7.0
 
Other
  
29.1
   
28.2
 
Total
 
$
411.5
  
$
411.1