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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2012
Fair Value Disclosures [Abstract]  
Fair value of senior notes
 
September 30, 2012
 
December 31, 2011
 
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
7.125% senior notes due in 2017
$
257.5

 
$
250.0

 
$
254.8

 
$
250.0

8.875% senior notes due in 2020
$
243.6

 
$
222.1

 
$
239.6

 
$
221.9

7.875% senior notes due in 2022
$
276.9

 
$
248.0

 
$
252.8

 
$
247.9

Fair value of plan assets
 
Fair Value Measurements at
 
Total
 
Quoted Prices in
Active markets for
Identical Assets
(Level 1)
 
Significant Other
Observable Inputs
 (Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
December 31, 2011
 

 
 

 
 

 
 

Oil Floors
$
0.1

 
$

 
$
0.1

 
$