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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2016
Fair Value Disclosures [Abstract]  
Fair value of senior notes
Based upon quoted market prices as of December 31, 2015 (predecessor), the fair value and carrying value of our senior notes was as follows (in millions):
 
Predecessor
 
Subject to Compromise
 
December 31, 2015
 
Fair Value
 
Carrying (1) Value
7.125% senior notes due in 2017
$
23.0

 
$
250.0

8.875% senior notes due in 2020
$
21.4

 
$
225.0

7.875% senior notes due in 2022
$
34.5

 
$
400.0

(1) Includes write-off of discount associated with the 2020 notes and premium associated with the 2022 notes due to the Company's bankruptcy proceedings.
Fair value of plan assets
The following table presents our assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2016 for the Successor Company, and are categorized using the fair value hierarchy. As of December 31, 2015 all of the Predecessor Company's hedging agreements had settled. For additional discussion related to the fair value of the Company's derivatives, refer to Note 6 of these consolidated financial statements.
 
Fair Value Measurements at
(in millions)
Total
 
Quoted Prices in
Active markets for
Identical Assets
(Level 1)
 
Significant Other
Observable Inputs
 (Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
December 31, 2016
 
 
 
 
 
 
 
Assets
 
 
 
 
 
 
 
Natural Gas Basis Derivatives
$
0.4

 
$
—

 
$
0.4

 
$
—

Liabilities
 
 
 
 
 
 
 
Natural Gas Derivatives
$
13.7

 
$
—

 
$
13.7

 
$
—

Natural Gas Basis Derivatives
$
0.1

 
$
—

 
$
0.1

 
$
—

Oil Derivatives
$
3.0

 
$
—

 
$
3.0

 
$
—