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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Summary of Debt
As of March 31, 2017 and December 31, 2016, long-term debt consisted of the following (in millions):
 
March 31, 2017
 
December 31, 2016
 
Outstanding Principal
 
Premium (Discount)
 
Long-Term Debt
 
Outstanding Principal
 
Premium (Discount)
 
Long-Term Debt
ENLK credit facility due 2020 (1)
$
330.0

 
$
—

 
$
330.0

 
$
120.0

 
$
—

 
$
120.0

ENLC credit facility due 2019 (2)
43.5

 
—

 
43.5

 
27.8

 
—

 
27.8

2.70% Senior unsecured notes due 2019
400.0

 
(0.2
)
 
399.8

 
400.0

 
(0.3
)
 
399.7

7.125% Senior unsecured notes due 2022 (3)
162.5

 
15.2

 
177.7

 
162.5

 
16.0

 
178.5

4.40% Senior unsecured notes due 2024
550.0

 
2.4

 
552.4

 
550.0

 
2.5

 
552.5

4.15% Senior unsecured notes due 2025
750.0

 
(1.1
)
 
748.9

 
750.0

 
(1.1
)
 
748.9

4.85% Senior unsecured notes due 2026
500.0

 
(0.6
)
 
499.4

 
500.0

 
(0.7
)
 
499.3

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

 
(6.6
)
 
443.4

 
450.0

 
(6.6
)
 
443.4

Debt classified as long-term
$
3,536.0

 
$
8.9

 
$
3,544.9

 
$
3,310.3

 
$
9.6

 
$
3,319.9

Debt issuance cost (4)
 
 
 
 
(23.8
)
 
 
 
 
 
(24.6
)
Long-term debt, net of unamortized issuance cost
 
 
 
 
$
3,521.1

 
 
 
 
 
$
3,295.3

                                                           
(1)
Bears interest based on Prime and/or LIBOR plus an applicable margin. The effective interest rate was 3.0% and 2.3% at March 31, 2017 and December 31, 2016, respectively.
(2)
Bears interest based on Prime and/or LIBOR plus an applicable margin. The effective interest rate was 3.1% and 3.4% at March 31, 2017 and December 31, 2016, respectively.
(3)
On April 3, 2017, ENLK issued notice to redeem its 7.125% senior unsecured notes due 2022 (the “2022 notes”). The 2022 notes will be redeemed on June 1, 2017 at 103.6% of the principal amount, plus accrued unpaid interest, for aggregate cash consideration of $174.1 million.
(4)
Net of amortization of $10.0 million and $9.0 million at March 31, 2017 and December 31, 2016, respectively.