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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Summary of Debt
As of March 31, 2018 and December 31, 2017, long-term debt consisted of the following (in millions):
 
March 31, 2018
 
December 31, 2017
 
Outstanding Principal
 
Premium (Discount)
 
Long-Term Debt
 
Outstanding Principal
 
Premium (Discount)
 
Long-Term Debt
ENLK credit facility due 2020 (1)
$
370.0

 
$
—

 
$
370.0

 
$
—

 
$
—

 
$
—

ENLC credit facility due 2019 (2)
76.5

 
—

 
76.5

 
74.6

 
—

 
74.6

2.70% Senior unsecured notes due 2019
400.0

 
(0.1
)
 
399.9

 
400.0

 
(0.1
)
 
399.9

4.40% Senior unsecured notes due 2024
550.0

 
2.1

 
552.1

 
550.0

 
2.2

 
552.2

4.15% Senior unsecured notes due 2025
750.0

 
(0.9
)
 
749.1

 
750.0

 
(1.0
)
 
749.0

4.85% Senior unsecured notes due 2026
500.0

 
(0.6
)
 
499.4

 
500.0

 
(0.6
)
 
499.4

5.60% Senior unsecured notes due 2044
350.0

 
(0.2
)
 
349.8

 
350.0

 
(0.2
)
 
349.8

5.05% Senior unsecured notes due 2045
450.0

 
(6.4
)
 
443.6

 
450.0

 
(6.5
)
 
443.5

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
$
3,946.5

 
$
(6.2
)
 
$
3,940.3

 
$
3,574.6

 
$
(6.3
)
 
$
3,568.3

Debt issuance cost (3)
 
 
 
 
(25.2
)
 
 
 
 
 
(26.2
)
Less: Current maturities of long-term debt (4)
 
 
 
 
(76.3
)
 
 
 
 
 
—

Long-term debt
 
 
 
 
$
3,838.8

 
 
 
 
 
$
3,542.1

                                                           
(1)
Bears interest based on Prime and/or LIBOR plus an applicable margin. The effective interest rate was 3.3% at March 31, 2018.
(2)
Bears interest based on Prime and/or LIBOR plus an applicable margin. The effective interest rate was 3.5% and 3.2% at March 31, 2018 and December 31, 2017, respectively.
(3)
Net of amortization of $13.9 million and $12.9 million at March 31, 2018 and December 31, 2017, respectively.
(4)
The outstanding balance, net of debt issuance costs, of the ENLC Credit Facility as of March 31, 2018 is classified as “Current maturities of long-term debt” on the consolidated balance sheet as the ENLC Credit Facility matures on March 7, 2019.