Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS, Debt Fair Value (Details)

 v2.3.0.11
FAIR VALUE MEASUREMENTS, Debt Fair Value (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Fair Value, Inputs, Level 2 [Member] | Senior Notes 8.125 Percent Stated Interest Rate [Member]
   
Debt Fair Value [Line Items]    
Estimated fair values of senior notes $ 253.4 $ 252.0
Fair Value, Inputs, Level 2 [Member] | Senior Notes 10.75 Percent Stated Interest Rate [Member]
   
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 312.8 311.4
Fair Value, Inputs, Level 2 [Member] | Convertible Senior Notes 2.875 Percent Stated Interest Rate [Member]
   
Debt Fair Value [Line Items]    
Estimated fair values of convertible senior notes 207.6 195.8
Fixed Rate Debt With Noncontrolling Interest Partner [Member]
   
Fair value, estimate not practicable [Abstract]    
Carrying amount, long-term debt $ 26.6 $ 29.5