Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS, Debt Fair Value (Details)

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FAIR VALUE MEASUREMENTS, Debt Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
7% Senior Notes Due 2020 [Member]
   
Debt Fair Value [Line Items]    
Interest rate, stated percentage (in hundredths) 7.00%  
Estimated fair values of senior notes $ 235.3  
8.125% Senior Notes due 2018 [Member]
   
Debt Fair Value [Line Items]    
Interest rate, stated percentage (in hundredths) 8.125% 8.125%
Estimated fair values of senior notes 272.0 243.3
10.75% Senior Notes due 2016 [Member]
   
Debt Fair Value [Line Items]    
Interest rate, stated percentage (in hundredths)   10.75%
Estimated fair values of senior notes   306.4
2.875% Convertible Senior Notes due 2027 [Member]
   
Debt Fair Value [Line Items]    
Interest rate, stated percentage (in hundredths) 2.875% 2.875%
Estimated fair values of convertible senior notes 216.1 193.6
Fixed Rate Debt With Noncontrolling Interest Partner [Member]
   
Fair value, estimate not practicable [Abstract]    
Fixed rate debt held by noncontrolling interest partners, carrying value $ 25.9 $ 26.0