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Long-Term Debt - Narrative (Details) - USD ($)
3 Months Ended
Feb. 26, 2021
Oct. 21, 2020
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument        
Increase (decrease) in accounts receivable     $ 505,900,000  
Outstanding principal     4,532,300,000 $ 4,632,300,000
AR Facility due 2023        
Debt Instrument        
Outstanding principal     150,000,000.0 250,000,000.0
Letters of credit        
Debt Instrument        
Line of credit facility, fair value of amount outstanding     0  
Additional amount available (not to exceed)     1,750,000,000  
Term Loan Due 2021        
Debt Instrument        
Outstanding principal     350,000,000.0 $ 350,000,000.0
Line of Credit | Asset-backed Securities        
Debt Instrument        
Maximum borrowing capacity $ 300,000,000.0 $ 250,000,000.0 262,100,000  
Line of credit facility, increase in period $ 50,000,000.0      
Drawn fee percentage 1.25% 1.625%    
Letter of Credit | Letters of credit | ENLC        
Debt Instrument        
Line of credit facility, fair value of amount outstanding     27,500,000  
LIBOR | Line of Credit | Minimum | Asset-backed Securities        
Debt Instrument        
Variable rate 0.00% 0.375%    
Letter of Credit | Letters of credit        
Debt Instrument        
Maximum borrowing capacity     500,000,000.0  
Unsecured Debt | Term Loan Due 2021        
Debt Instrument        
Face amount     $ 350,000,000.0