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Long-Term Debt (Tables)
3 Months Ended
Mar. 31, 2020
Debt Disclosure [Abstract]  
Summary of Debt
As of March 31, 2020 and December 31, 2019, long-term debt consisted of the following (in millions):

March 31, 2020December 31, 2019
Outstanding PrincipalPremium (Discount)Long-Term DebtOutstanding PrincipalPremium (Discount)Long-Term Debt
Consolidated Credit Facility due 2024 (1)$550.0  $—  $550.0  $350.0  $—  $350.0  
Term Loan due 2021 (2)850.0  —  850.0  850.0  —  850.0  
ENLK’s 4.40% Senior unsecured notes due 2024545.0  1.4  546.4  550.0  1.5  551.5  
ENLK’s 4.15% Senior unsecured notes due 2025747.5  (0.7) 746.8  750.0  (0.7) 749.3  
ENLK’s 4.85% Senior unsecured notes due 2026497.0  (0.4) 496.6  500.0  (0.5) 499.5  
ENLC’s 5.375% Senior unsecured notes due 2029500.0  —  500.0  500.0  —  500.0  
ENLK’s 5.60% Senior unsecured notes due 2044350.0  (0.2) 349.8  350.0  (0.2) 349.8  
ENLK’s 5.05% Senior unsecured notes due 2045450.0  (5.9) 444.1  450.0  (5.9) 444.1  
ENLK’s 5.45% Senior unsecured notes due 2047500.0  (0.1) 499.9  500.0  (0.1) 499.9  
Debt classified as long-term, including current maturities of long-term debt$4,989.5  $(5.9) 4,983.6  $4,800.0  $(5.9) 4,794.1  
Debt issuance cost (3)(28.8) (29.8) 
Long-term debt, net of unamortized issuance cost$4,954.8  $4,764.3  
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(1)Bears interest based on Prime and/or LIBOR plus an applicable margin. The effective interest rate was 2.4% and 3.3% at March 31, 2020 and December 31, 2019, respectively.
(2)Bears interest based on Prime and/or LIBOR plus an applicable margin. The effective interest rate was 2.2% and 3.2% at March 31, 2020 and December 31, 2019, respectively.
(3)Net of amortization of $11.9 million and $10.9 million at March 31, 2020 and December 31, 2019, respectively.