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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of Net Assets (Liabilities) Measured on a Recurring Basis
Net assets (liabilities) measured at fair value on a recurring basis are summarized below (in millions):

 
Level 2
 
December 31, 2017
 
December 31, 2016
Commodity Swaps (1)
$
(1.6
)
 
$
(6.3
)
(1)
The fair value of derivative contracts included in assets or liabilities for risk management activities represents the amount at which the instruments could be exchanged in a current arms-length transaction adjusted for credit risk of us and/or the counterparty as required under ASC 820.
Schedule of the Estimated Fair Value of Financial Instruments
Considerable judgment is required to develop the estimates of fair value; thus, the estimates provided below are not necessarily indicative of the amount we could realize upon the sale or refinancing of such financial instruments (in millions):

 
December 31, 2017
 
December 31, 2016
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Long-term debt (1)
$
3,542.1

 
$
3,650.2

 
$
3,295.3

 
$
3,253.6

Installment Payables
$
249.5

 
$
249.6

 
$
473.2

 
$
476.6

Obligations under capital lease
$
4.1

 
$
3.4

 
$
6.6

 
$
6.1

(1)
The carrying values of long-term debt are reduced by debt issuance costs of $26.2 million and $24.6 million at December 31, 2017 and 2016, respectively. The respective fair values do not factor in debt issuance costs.