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Long-Term Debt - Narrative (Details)
12 Months Ended
Jan. 25, 2019
USD ($)
Dec. 11, 2018
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Jun. 01, 2017
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May 11, 2017
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Jul. 14, 2016
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Dec. 31, 2018
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Dec. 31, 2017
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Dec. 31, 2016
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Jan. 01, 2019
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May 12, 2015
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Nov. 12, 2014
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Sep. 20, 2014
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Jul. 20, 2014
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Mar. 19, 2014
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Mar. 07, 2014
USD ($)
Debt Instrument                              
Premium           $ 6,100,000 $ 6,300,000                
Debt instrument, repurchased face amount     $ 162,500,000                        
Debt instrument, repurchase amount     $ 174,100,000                        
Gain on extinguishment of debt           $ 0 $ 9,000,000 $ 0              
Debt instrument, redemption price, percentage     103.60%     100.00%                  
EnLink Midstream Partners, LP                              
Debt Instrument                              
Debt instrument, face amount                   $ 900,000,000.0          
Maximum | EnLink Midstream Partners, LP                              
Debt Instrument                              
Stated interest rate           5.60% 5.60%                
Minimum | EnLink Midstream Partners, LP                              
Debt Instrument                              
Stated interest rate           2.70% 2.70%                
ENLC credit facility due 2019                              
Debt Instrument                              
Maximum borrowing capacity           $ 250,000,000.0                  
Outstanding letters of credit           0 $ 0                
Outstanding borrowings           111,400,000 74,600,000                
Premium           0                  
ENLC credit facility due 2019 | Letter of Credit                              
Debt Instrument                              
Maximum borrowing capacity           $ 125,000,000.0                  
ENLC credit facility due 2019 | LIBOR | Maximum                              
Debt Instrument                              
Variable rate           2.50%                  
ENLC credit facility due 2019 | LIBOR | Minimum                              
Debt Instrument                              
Variable rate           1.75%                  
ENLC credit facility due 2019 | Federal Funds                              
Debt Instrument                              
Variable rate           0.50%                  
ENLC credit facility due 2019 | Eurodollar                              
Debt Instrument                              
Variable rate           1.00%                  
ENLC credit facility due 2019 | Eurodollar | Maximum                              
Debt Instrument                              
Variable rate           1.50%                  
ENLC credit facility due 2019 | Eurodollar | Minimum                              
Debt Instrument                              
Variable rate           0.75%                  
ENLK Credit Facility | EnLink Midstream Partners, LP                              
Debt Instrument                              
Maximum borrowing capacity           $ 1,500,000,000                  
Outstanding borrowings           0 0                
ENLK Credit Facility | Letter of Credit | EnLink Midstream Partners, LP                              
Debt Instrument                              
Outstanding letters of credit           9,800,000 9,800,000                
Additional amount available (not to exceed)           $ 500,000,000                  
ENLK Credit Facility | LIBOR | Maximum | EnLink Midstream Partners, LP                              
Debt Instrument                              
Variable rate           1.75%                  
ENLK Credit Facility | LIBOR | Minimum | EnLink Midstream Partners, LP                              
Debt Instrument                              
Variable rate           1.00%                  
ENLK Credit Facility | Federal Funds | EnLink Midstream Partners, LP                              
Debt Instrument                              
Variable rate           0.50%                  
ENLK Credit Facility | Eurodollar | EnLink Midstream Partners, LP                              
Debt Instrument                              
Variable rate           1.00%                  
ENLK Credit Facility | Eurodollar | Maximum | EnLink Midstream Partners, LP                              
Debt Instrument                              
Variable rate           0.75%                  
ENLK Credit Facility | Eurodollar | Minimum | EnLink Midstream Partners, LP                              
Debt Instrument                              
Variable rate           0.00%                  
Term Loan due 2021                              
Debt Instrument                              
Premium           $ 0 0                
7.125% Senior unsecured notes due 2022 | EnLink Midstream Partners, LP                              
Debt Instrument                              
Debt instrument, face amount                             $ 196,500,000.0
Stated interest rate                             7.125%
Long-term debt                             $ 226,000,000
Premium                             $ (29,500,000)
Debt instrument, repurchased face amount                       $ 15,500,000 $ 18,500,000    
Debt instrument, repurchase amount                       $ 17,000,000 $ 20,000,000    
Unsecured senior notes due 2019, 2024, 2044 | EnLink Midstream Partners, LP                              
Debt Instrument                              
Debt instrument, face amount                           $ 1,200,000,000.0  
2.70% Senior unsecured notes due 2019                              
Debt Instrument                              
Stated interest rate           2.70%                  
Premium           $ 0 100,000                
2.70% Senior unsecured notes due 2019 | EnLink Midstream Partners, LP                              
Debt Instrument                              
Debt instrument, face amount                           $ 400,000,000.0  
Stated interest rate                           2.70%  
Selling price of debt instrument                           99.85%  
5.60% Senior unsecured notes due 2044                              
Debt Instrument                              
Stated interest rate           5.60%                  
Premium           $ 200,000 200,000                
5.60% Senior unsecured notes due 2044 | EnLink Midstream Partners, LP                              
Debt Instrument                              
Debt instrument, face amount                           $ 350,000,000.0  
Stated interest rate                           5.60%  
Selling price of debt instrument                           99.925%  
4.40% Senior unsecured notes due 2024                              
Debt Instrument                              
Stated interest rate           4.40%                  
Premium           $ (1,800,000) (2,200,000)                
4.40% Senior unsecured notes due 2024 | EnLink Midstream Partners, LP                              
Debt Instrument                              
Debt instrument, face amount                     $ 100,000,000.0     $ 450,000,000.0  
Stated interest rate                           4.40%  
Selling price of debt instrument                     104.007%     99.83%  
5.05% Senior unsecured notes due 2045                              
Debt Instrument                              
Stated interest rate           5.05%                  
Premium           $ 6,200,000 6,500,000                
5.05% Senior unsecured notes due 2045 | EnLink Midstream Partners, LP                              
Debt Instrument                              
Debt instrument, face amount                   $ 150,000,000.0 $ 300,000,000.0        
Stated interest rate                     5.05%        
Selling price of debt instrument                   96.381% 99.452%        
4.15% Senior unsecured notes due 2025                              
Debt Instrument                              
Stated interest rate           4.15%                  
Premium           $ 900,000 1,000,000                
4.15% Senior unsecured notes due 2025 | EnLink Midstream Partners, LP                              
Debt Instrument                              
Debt instrument, face amount                   $ 750,000,000.0          
Stated interest rate                   4.15%          
Selling price of debt instrument                   99.827%          
4.85% Senior unsecured notes due 2026                              
Debt Instrument                              
Stated interest rate           4.85%                  
Premium           $ 500,000 600,000                
4.85% Senior unsecured notes due 2026 | EnLink Midstream Partners, LP                              
Debt Instrument                              
Debt instrument, face amount         $ 500,000,000.0                    
Stated interest rate         4.85%                    
Selling price of debt instrument         99.859%                    
Proceeds from issuance of debt         $ 495,700,000                    
5.45% Senior unsecured notes due 2047                              
Debt Instrument                              
Stated interest rate           5.45%                  
Premium           $ 100,000 $ 100,000                
5.45% Senior unsecured notes due 2047 | EnLink Midstream Partners, LP                              
Debt Instrument                              
Debt instrument, face amount       $ 500,000,000.0                      
Stated interest rate       5.45%                      
Selling price of debt instrument       99.981%                      
Proceeds from issuance of debt       $ 495,200,000                      
Unsecured Debt | Term Loan due 2021                              
Debt Instrument                              
Consolidated indebtedness to consolidated EBITDA, ratio   5.00                          
Consolidated indebtedness to consolidated EBITDA, during an acquisition period, ratio   5.50                          
Debt instrument, face amount   $ 850,000,000       850,000,000                  
Consolidated EBITDA to consolidated interest charges, ratio   2.50                          
Unsecured Debt | Term Loan due 2021 | Minimum                              
Debt Instrument                              
Conditional acquisition purchase price (or more)   $ 50,000,000                          
Unsecured Debt | Term Loan due 2021 | LIBOR | Maximum                              
Debt Instrument                              
Variable rate   1.75%                          
Unsecured Debt | Term Loan due 2021 | LIBOR | Minimum                              
Debt Instrument                              
Variable rate   1.00%                          
Unsecured Debt | Term Loan due 2021 | Federal Funds                              
Debt Instrument                              
Variable rate   0.50%                          
Unsecured Debt | Term Loan due 2021 | Eurodollar                              
Debt Instrument                              
Variable rate   1.00%                          
Unsecured Debt | Term Loan due 2021 | Eurodollar | Maximum                              
Debt Instrument                              
Variable rate   0.75%                          
Unsecured Debt | Term Loan due 2021 | Eurodollar | Minimum                              
Debt Instrument                              
Variable rate   0.00%                          
Line of Credit | ENLC credit facility due 2019 | Revolving Credit Facility | EnLink Midstream Partners, LP                              
Debt Instrument                              
Maximum borrowing capacity           1,500,000,000.0                  
Line of Credit | ENLC credit facility due 2019 | Revolving Credit Facility | ENLC                              
Debt Instrument                              
Maximum borrowing capacity           250,000,000                  
Line of Credit | ENLK Credit Facility | Revolving Credit Facility                              
Debt Instrument                              
Maximum borrowing capacity           1,500,000,000.0                  
Line of Credit | ENLK Credit Facility | Revolving Credit Facility | ENLC                              
Debt Instrument                              
Maximum borrowing capacity           $ 250,000,000.0                  
Subsequent Event | Line of Credit | Consolidated Revolving Credit Facility                              
Debt Instrument                              
Maximum borrowing capacity                 $ 2,250,000,000.00            
Consolidated indebtedness to consolidated EBITDA, ratio 5.00                            
Consolidated indebtedness to consolidated EBITDA, during an acquisition period, ratio 5.50                            
Consolidated EBITDA to consolidated interest charges, ratio 2.50                            
Subsequent Event | Line of Credit | Consolidated Revolving Credit Facility | Minimum                              
Debt Instrument                              
Conditional acquisition purchase price (or more) $ 0                            
Subsequent Event | Line of Credit | Consolidated Revolving Credit Facility | Revolving Credit Facility                              
Debt Instrument                              
Maximum borrowing capacity                 $ 1,750,000,000.00            
Subsequent Event | Line of Credit | Consolidated Revolving Credit Facility | LIBOR | Maximum                              
Debt Instrument                              
Variable rate 2.00%                            
Subsequent Event | Line of Credit | Consolidated Revolving Credit Facility | LIBOR | Minimum                              
Debt Instrument                              
Variable rate 1.125%                            
Subsequent Event | Line of Credit | Consolidated Revolving Credit Facility | Federal Funds                              
Debt Instrument                              
Variable rate 0.50%                            
Subsequent Event | Line of Credit | Consolidated Revolving Credit Facility | Eurodollar                              
Debt Instrument                              
Variable rate 1.00%                            
Subsequent Event | Line of Credit | Consolidated Revolving Credit Facility | Eurodollar | Maximum                              
Debt Instrument                              
Variable rate 1.00%                            
Subsequent Event | Line of Credit | Consolidated Revolving Credit Facility | Eurodollar | Minimum                              
Debt Instrument                              
Variable rate 0.125%