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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018
 
December 31, 2017
Commodity Swaps (1)
$
8.5

 
$
(1.6
)
____________________________
(1)
The fair values of derivative contracts included in assets or liabilities for risk management activities represent the amount at which the instruments could be exchanged in a current arms-length transaction adjusted for our credit risk and/or the counterparty credit risk 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, 2018
 
December 31, 2017
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Long-term debt, including current maturities of long-term debt (1)
$
4,430.8

 
$
4,065.0

 
$
3,542.1

 
$
3,650.2

Installment Payables
$
—

 
$
—

 
$
249.5

 
$
249.6

Obligations under capital lease
$
2.5

 
$
2.2

 
$
4.1

 
$
3.4

Secured term loan receivable
$
51.1

 
$
51.1

 
$
—

 
$
—

____________________________
(1)
The carrying value of long-term debt, including current maturities of long-term debt, is reduced by debt issuance costs of $24.5 million and $26.2 million at December 31, 2018 and 2017, respectively. The respective fair values do not factor in debt issuance costs.