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Fair Value Measurements
9 Months Ended
Sep. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value Measurements
Fair Value Measurements

Fair Values—Recurring

There were no assets accounted for at fair value on a recurring basis at September 30, 2015 and December 31, 2014.

Fair Values—Reported

Our primary financial instruments are trade receivables and payables. We believe the carrying values of our current assets and liabilities approximate fair value. Our fair value assessment incorporates a variety of considerations, including (1) the short-term duration of the instruments, (2) our investment-grade credit rating and (3) our historical incurrence of and expected future insignificance of bad debt expense, which includes an evaluation of counterparty credit risk. Fair value of fixed-rate long-term debt is measured using a market approach, based upon the average of quotes from major financial institutions and a third-party service for our debt. Because these quotes cannot be independently verified to the market, they are considered Level 3 inputs. Fair value of our variable-rate long-term debt approximates the carrying value. The following table summarizes the fair value and carrying value of our long-term debt, excluding capital leases and debt issuance costs, at September 30, 2015 and December 31, 2014.
 
September 30, 2015
 
December 31, 2014
(In millions)
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
Long-term debt
$
711.1

 
$
748.3

 
$
635.6

 
$
635.0