Annual report pursuant to Section 13 and 15(d)

FAIR VALUE MEASUREMENTS, Debt Fair Value (Details)

v2.4.0.6
FAIR VALUE MEASUREMENTS, Debt Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Fixed Rate Debt With Noncontrolling Interest Partner [Member]
   
Fair value, estimate not practicable [Abstract]    
Carrying amount, long-term debt $ 25.7 $ 29.5
Fair Value, Inputs, Level 2 [Member] | 8.125% Senior Notes due 2018 [Member]
   
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 243.3 252.0
Interest rate, stated percentage (in hundredths) 8.125% 8.125%
Fair Value, Inputs, Level 2 [Member] | 10.75% Senior Notes due 2016 [Member]
   
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 306.4 311.4
Interest rate, stated percentage (in hundredths) 10.75% 10.75%
Fair Value, Inputs, Level 2 [Member] | 2.875% Convertible Senior Notes due 2027 [Member]
   
Debt Fair Value [Line Items]    
Estimated fair values of convertible senior notes $ 193.6 $ 195.8
Interest rate, stated percentage (in hundredths) 2.875% 2.875%