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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 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
 
March 31, 2017
 
December 31, 2016
Commodity Swaps (1)
$
(1.0
)
 
$
(6.3
)
Total
$
(1.0
)
 
$
(6.3
)
                                                           
(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
The estimated fair value of our financial instruments has been determined using available market information and valuation methodologies. 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):
 
March 31, 2017
 
December 31, 2016
 
Carrying Value
 
Fair Value
 
Carrying Value
 
Fair Value
Long-term debt (1)
$
3,521.1

 
$
3,543.1

 
$
3,295.8

 
$
3,253.6

Installment Payables
$
230.1

 
$
232.9

 
$
473.2

 
$
476.6

Obligations under capital lease
$
5.1

 
$
4.3

 
$
6.6

 
$
6.1

                                                           
(1)
The carrying values of long-term debt are reduced by debt issuance costs of $23.8 million and $24.6 million at March 31, 2017 and December 31, 2016, respectively. The respective fair values do not factor in debt issuance costs.