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Long-Term Debt - Narrative (Details)
9 Months Ended
Dec. 11, 2018
USD ($)
Sep. 30, 2020
USD ($)
Letters of credit    
Debt Instrument    
Additional amount available (not to exceed)   $ 1,750,000,000
Maximum borrowing capacity   2,250,000,000
Line of credit facility, fair value of amount outstanding   300,000,000.0
Term Loan Due 2021    
Debt Instrument    
Ratio of consolidated indebtedness to consolidated EBITDA 5.0  
Maximum | Term Loan Due 2021    
Debt Instrument    
Ratio of consolidated indebtedness to consolidated EBITDA 5.5  
Conditional acquisition purchase price (or more) $ 50,000,000.0  
Letter of Credit | Letters of credit    
Debt Instrument    
Maximum borrowing capacity   $ 500,000,000.0
Debt instrument, covenant, percentage of letter of credits guaranteed   105.00%
Unsecured Debt | Letters of credit    
Debt Instrument    
Line of credit facility, consolidated EBITDA to consolidated interest charges, ratio   2.5
Ratio of consolidated indebtedness to consolidated EBITDA   5.0
Line of credit facility, consolidated indebtedness to consolidated EBITDA, during an acquisition period, ratio   5.5
Unsecured Debt | Term Loan Due 2021    
Debt Instrument    
Face amount   $ 850,000,000.0
Unsecured Debt | Minimum | Letters of credit    
Debt Instrument    
Conditional acquisition purchase price (or more)   $ 50,000,000.0
Unsecured Debt | LIBOR | Minimum | Letters of credit    
Debt Instrument    
Variable rate   1.125%
Unsecured Debt | LIBOR | Maximum | Letters of credit    
Debt Instrument    
Variable rate   2.00%
Unsecured Debt | Federal Funds | Letters of credit    
Debt Instrument    
Variable rate   0.50%
Unsecured Debt | Eurodollar | Letters of credit    
Debt Instrument    
Variable rate   1.00%
Unsecured Debt | Eurodollar | Minimum | Letters of credit    
Debt Instrument    
Variable rate   0.125%
Unsecured Debt | Eurodollar | Maximum | Letters of credit    
Debt Instrument    
Variable rate   1.00%
Line of Credit | Term Loan Due 2021    
Debt Instrument    
Line of credit facility, consolidated EBITDA to consolidated interest charges, ratio 2.5  
Line of Credit | LIBOR | Minimum | Term Loan Due 2021    
Debt Instrument    
Variable rate 1.00%  
Line of Credit | LIBOR | Maximum | Term Loan Due 2021    
Debt Instrument    
Variable rate 1.75%  
Line of Credit | Federal Funds | Term Loan Due 2021    
Debt Instrument    
Variable rate 0.50%  
Line of Credit | Eurodollar | Term Loan Due 2021    
Debt Instrument    
Variable rate 1.00%  
Line of Credit | Eurodollar | Minimum | Term Loan Due 2021    
Debt Instrument    
Variable rate 0.00%  
Line of Credit | Eurodollar | Maximum | Term Loan Due 2021    
Debt Instrument    
Variable rate 0.75%  
ENLC | Letter of Credit | Letters of credit    
Debt Instrument    
Line of credit facility, fair value of amount outstanding   $ 19,300,000