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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Fair value of senior notes
Based upon quoted market prices as of March 31, 2015 and December 31, 2014, the fair value and carrying value of our senior notes was as follows (in millions):
 
March 31, 2015
 
December 31, 2014
 
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
7.125% senior notes due in 2017
$
151.3

 
$
250.0

 
$
153.0

 
$
250.0

8.875% senior notes due in 2020
$
92.2

 
$
222.9

 
$
133.1

 
$
222.8

7.875% senior notes due in 2022
$
164.0

 
$
404.3

 
$
198.0

 
$
404.5
Fair value of plan assets
The following table presents our assets and liabilities that are measured at fair value as of March 31, 2015 and December 31, 2014, and are categorized using the fair value hierarchy. For additional discussion related to the fair value of the Company's derivatives, refer to Note 7 of these condensed consolidated financial statements. The fair value hierarchy has three levels based on the reliability of the inputs used to determine the fair value (in millions):
 
Fair Value Measurements at
 
Total Assets / (Liabilities)
 
Quoted Prices in
Active markets for
Identical Assets
(Level 1)
 
Significant Other
Observable Inputs
 (Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
March 31, 2015
 

 
 

 
 

 
 

  Assets:
 
 
 
 
 
 
 
    Natural Gas Basis Derivatives

$
0.2

 
$
—

 
$
0.2

 
$
—

 
 
 
 
 
 
 
 
December 31, 2014
 
 
 
 
 
 
 
  Assets:
 
 
 
 
 
 
 
    Natural Gas Derivatives
2.4

 
—

 
2.4

 
—

    Natural Gas Basis Derivatives
0.1

 
—

 
0.1

 
—

  Liabilities:
 
 
 
 
 
 
 
    Natural Gas Basis Derivatives
0.1

 
—

 
0.1

 
—