As of March 31, 2020 and December 31, 2019, long-term debt consisted of the following (in millions):
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2020 | | | | | | December 31, 2019 | | | | | | Outstanding Principal | | Premium (Discount) | | Long-Term Debt | | Outstanding Principal | | Premium (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 2024 | 545.0 | | | 1.4 | | | 546.4 | | | 550.0 | | | 1.5 | | | 551.5 | | ENLK’s 4.15% Senior unsecured notes due 2025 | 747.5 | | | (0.7) | | | 746.8 | | | 750.0 | | | (0.7) | | | 749.3 | | ENLK’s 4.85% Senior unsecured notes due 2026 | 497.0 | | | (0.4) | | | 496.6 | | | 500.0 | | | (0.5) | | | 499.5 | | ENLC’s 5.375% Senior unsecured notes due 2029 | 500.0 | | | — | | | 500.0 | | | 500.0 | | | — | | | 500.0 | | ENLK’s 5.60% Senior unsecured notes due 2044 | 350.0 | | | (0.2) | | | 349.8 | | | 350.0 | | | (0.2) | | | 349.8 | | ENLK’s 5.05% Senior unsecured notes due 2045 | 450.0 | | | (5.9) | | | 444.1 | | | 450.0 | | | (5.9) | | | 444.1 | | ENLK’s 5.45% Senior unsecured notes due 2047 | 500.0 | | | (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 | |
____________________________ (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.
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