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Long-Term Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Summary of Debt
As of June 30, 2018 and December 31, 2017, long-term debt consisted of the following (in millions):
 
June 30, 2018
 
December 31, 2017
 
Outstanding Principal
 
Premium (Discount)
 
Long-Term Debt
 
Outstanding Principal
 
Premium (Discount)
 
Long-Term Debt
ENLK credit facility due 2020 (1)
$
520.0

 
$
—

 
$
520.0

 
$
—

 
$
—

 
$
—

ENLC credit facility due 2019 (2)
84.4

 
—

 
84.4

 
74.6

 
—

 
74.6

ENLK’s 2.70% Senior unsecured notes due 2019
400.0

 
(0.1
)
 
399.9

 
400.0

 
(0.1
)
 
399.9

ENLK’s 4.40% Senior unsecured notes due 2024
550.0

 
2.0

 
552.0

 
550.0

 
2.2

 
552.2

ENLK’s 4.15% Senior unsecured notes due 2025
750.0

 
(0.9
)
 
749.1

 
750.0

 
(1.0
)
 
749.0

ENLK’s 4.85% Senior unsecured notes due 2026
500.0

 
(0.6
)
 
499.4

 
500.0

 
(0.6
)
 
499.4

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

 
(6.3
)
 
443.7

 
450.0

 
(6.5
)
 
443.5

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
$
4,104.4

 
$
(6.2
)
 
$
4,098.2

 
$
3,574.6

 
$
(6.3
)
 
$
3,568.3

Debt issuance cost (3)
 
 
 
 
(24.3
)
 
 
 
 
 
(26.2
)
Less: Current maturities of long-term debt (4)
 
 
 
 
(483.7
)
 
 
 
 
 
—

Long-term debt, net of unamortized issuance cost
 
 
 
 
$
3,590.2

 
 
 
 
 
$
3,542.1

                                                           
(1)
Bears interest based on Prime and/or LIBOR plus an applicable margin. The effective interest rate was 3.6% at June 30, 2018.
(2)
Bears interest based on Prime and/or LIBOR plus an applicable margin. The effective interest rate was 3.9% and 3.2% at June 30, 2018 and December 31, 2017, respectively.
(3)
Net of amortization of $14.8 million and $12.9 million at June 30, 2018 and December 31, 2017, respectively.
(4)
The outstanding balance, net of debt issuance costs, of the ENLC Credit Facility and ENLK’s 2.70% senior unsecured notes as of June 30, 2018 are classified as “Current maturities of long-term debt” on the consolidated balance sheet as the ENLC Credit Facility matures on March 7, 2019, and ENLK’s 2.70% senior unsecured notes mature on April 1, 2019.