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FAIR VALUE MEASUREMENTS, Debt Fair Value (Details) (USD $)
In Millions, unless otherwise specified |
Jun. 30, 2012
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Dec. 31, 2011
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|---|---|---|
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8.125% Senior Notes due 2018 [Member]
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| Debt Fair Value [Line Items] | ||
| Estimated fair values of senior notes | $ 255.9 | $ 243.3 |
| Interest rate, stated percentage (in hundredths) | 8.125% | 8.125% |
|
10.75% Senior Notes due 2016 [Member]
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| Debt Fair Value [Line Items] | ||
| Estimated fair values of senior notes | 303.5 | 306.4 |
| Interest rate, stated percentage (in hundredths) | 10.75% | 10.75% |
|
2.875% Convertible Senior Notes due 2027 [Member]
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||
| Debt Fair Value [Line Items] | ||
| Estimated fair values of convertible senior notes | 209.9 | 193.6 |
| Interest rate, stated percentage (in hundredths) | 2.875% | 2.875% |
|
Fixed Rate Debt With Noncontrolling Interest Partner [Member]
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| Fair value, estimate not practicable [Abstract] | ||
| Fixed rate debt held by noncontrolling interest partners, carrying value | $ 25.0 | $ 26.0 |