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Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Apr. 09, 2019
Dec. 31, 2018
May 11, 2017
Debt Instrument        
Outstanding Principal $ 4,800.0   $ 4,461.4  
Premium (Discount) (5.9)   (6.1)  
Long-Term Debt 4,794.1   4,455.3  
Less: debt issuance cost (29.8)   (24.5)  
Less: current maturities of long-term debt 0.0   (399.8)  
Long-term debt, net of unamortized issuance cost 4,764.3   4,031.0  
Debt issuance cost accumulated amortization 10.9   16.5  
Credit Facility Due 2024        
Debt Instrument        
Outstanding Principal 350.0   0.0  
Premium (Discount) 0.0      
Long-Term Debt $ 350.0   0.0  
Effective interest rate 3.30%      
Term Loan due 2021        
Debt Instrument        
Outstanding Principal $ 850.0   850.0  
Premium (Discount) 0.0   0.0  
Long-Term Debt $ 850.0   $ 850.0  
Effective interest rate 3.20%   3.90%  
ENLC credit facility due 2019        
Debt Instrument        
Outstanding Principal $ 0.0   $ 111.4  
Premium (Discount) 0.0   0.0  
Long-Term Debt $ 0.0   $ 111.4  
Effective interest rate     4.40%  
2.70% Senior unsecured notes due 2019        
Debt Instrument        
Stated interest rate 2.70%   2.70%  
Outstanding Principal $ 0.0   $ 400.0  
Premium (Discount) 0.0   0.0  
Long-Term Debt $ 0.0   400.0  
Debt instrument, face amount   $ 400.0    
ENLK’s 4.40% Senior unsecured notes due 2024        
Debt Instrument        
Stated interest rate 4.40%      
Outstanding Principal $ 550.0   550.0  
Premium (Discount) 1.5   1.8  
Long-Term Debt $ 551.5   551.8  
ENLK’s 4.15% Senior unsecured notes due 2025        
Debt Instrument        
Stated interest rate 4.15%      
Outstanding Principal $ 750.0   750.0  
Premium (Discount) (0.7)   (0.9)  
Long-Term Debt $ 749.3   749.1  
ENLK’s 4.85% Senior unsecured notes due 2026        
Debt Instrument        
Stated interest rate 4.85%      
Outstanding Principal $ 500.0   500.0  
Premium (Discount) (0.5)   (0.5)  
Long-Term Debt 499.5   499.5  
ENLC’s 5.375% Senior unsecured notes due 2029        
Debt Instrument        
Outstanding Principal 500.0   0.0  
Premium (Discount) 0.0   0.0  
Long-Term Debt $ 500.0   0.0  
ENLK’s 5.60% Senior unsecured notes due 2044        
Debt Instrument        
Stated interest rate 5.60%      
Outstanding Principal $ 350.0   350.0  
Premium (Discount) (0.2)   (0.2)  
Long-Term Debt $ 349.8   349.8  
ENLK’s 5.05% Senior unsecured notes due 2045        
Debt Instrument        
Stated interest rate 5.05%      
Outstanding Principal $ 450.0   450.0  
Premium (Discount) (5.9)   (6.2)  
Long-Term Debt $ 444.1   443.8  
ENLK’s 5.45% Senior unsecured notes due 2047        
Debt Instrument        
Stated interest rate 5.45%     5.45%
Outstanding Principal $ 500.0   500.0  
Premium (Discount) (0.1)   (0.1)  
Long-Term Debt 499.9   $ 499.9  
Unsecured Debt | Term Loan due 2021        
Debt Instrument        
Debt instrument, face amount $ 850.0