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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2016
Fair Value Disclosures [Abstract]  
Fair value of senior notes
Based upon quoted market prices as of March 31, 2016 and December 31, 2015, the fair value and carrying value of our senior notes was as follows (in millions):
 
March 31, 2016
 
December 31, 2015
 
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
7.125% senior notes due 2017
$
13.4

 
$
250.0

 
$
23.0

 
$
250.0

8.875% senior notes due 2020 (1)
$
9.9

 
$
225.0

 
$
21.4

 
$
225.0

7.875% senior notes due 2022 (1)
$
20.9

 
$
400.0

 
$
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.