Quarterly report pursuant to Section 13 or 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
Mar. 31, 2012
Dec. 31, 2011
8.125% Senior Notes due 2018 [Member]
   
Debt Fair Value [Line Items]    
Estimated fair values of senior notes $ 266.6 $ 243.3
Interest rate, stated percentage (in hundredths) 8.125% 8.125%
10.75% Senior Notes due 2016 [Member]
   
Debt Fair Value [Line Items]    
Estimated fair values of senior notes 309.6 306.4
Interest rate, stated percentage (in hundredths) 10.75% 10.75%
2.875% Convertible Senior Notes due 2027 [Member]
   
Debt Fair Value [Line Items]    
Estimated fair values of convertible senior notes 207.4 193.6
Interest rate, stated percentage (in hundredths) 2.875% 2.875%
Fixed Rate Debt With Noncontrolling Interest Partner [Member]
   
Fair value, estimate not practicable [Abstract]    
Carrying amount, long-term debt $ 24.9 $ 26.0