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Net Income Per Share (Schedule of Income Per Share) (Details) (USD $)
In Millions, except Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Net Income Per Share    
Net income (loss)$ (6.9)$ 1.0$ (44.7)$ (1.5)
Net income (loss) if-converted$ (6.9)$ 1.0$ (44.7)$ (1.5)
Weighted average common shares123,000,000.00115,100,000.00122,400,000.00114,600,000.00
Less: Weighted average unvested restricted stock1,700,0001,900,0001,700,0002,000,000
Denominator for basic calculation121,300,000113,200,000120,700,000112,600,000
Stock compensation awards 400,0002,100,000400,000
Convertible notes44,300,00048,100,00044,500,00048,100,000
Convertible preferred stock - equivalent common shares25,200,0004,700,00017,900,0001,600,000
Convertible preferred stock - less: share issuance limitation2,400,000   
Convertible preferred stock - net allowable shares22,800,0004,700,00017,900,0001,600,000
Subtotal67,100,00053,200,00064,500,00050,100,000
Less: shares excluded in a period of net loss (e)67,100,000 64,500,00050,100,000
Weighted average effect of dilutive securities 53,200,000  
Denominator for diluted calculation121,300,000166,400,000120,700,000112,600,000
Net income (loss) per share - basic$ (0.06)$ 0.01$ (0.37)$ (0.01)
Net income (loss) per share - diluted$ (0.06)$ 0.01$ (0.37)$ (0.01)