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Debt (Details 1) (Convertible subordinated notes [Member], USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Convertible subordinated notes [Member]
    
Total interest expenses recognized on the convertible subordinated notes    
Coupon rate interest$ 4.4$ 4.4$ 13.1$ 13.1
Amortized debt discount2.92.68.47.7
Total interest expenses recognized on the convertible subordinated notes$ 7.3$ 7.0$ 21.5$ 20.8