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Long-Term Debt - Narrative (Details)
3 Months Ended
Dec. 11, 2018
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument        
Payments on borrowings   $ 241,000,000.0 $ 581,400,000  
Outstanding principal   4,989,500,000   $ 4,800,000,000.0
Gain on extinguishment of debt   5,300,000 $ 0  
Letters of credit        
Debt Instrument        
Additional amount available (not to exceed) $ 1,750,000,000 2,250,000,000    
Line of credit facility, fair value of amount outstanding   550,000,000.0    
Term Loan Due 2021        
Debt Instrument        
Ratio of consolidated indebtedness to consolidated EBITDA 5.0      
Outstanding principal   850,000,000.0   $ 850,000,000.0
Senior Notes due 2024, 2025, 2026        
Debt Instrument        
Payments on borrowings   5,200,000    
Outstanding principal   10,500,000    
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      
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%      
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%    
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   $ 18,800,000