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Share Based Compensation (Details) (USD $)
In Millions, except Share data
3 Months Ended9 Months Ended
Jun. 30, 2011
Sep. 30, 2011
Sep. 30, 2010
Performance Unit Plan [Abstract]   
Performance units granted 15,655 
Accelerated compensation costs from amendment$ 0.5  
Compensation expense 0.90.8
Cash payments for prior activity 0.5 
Vested awards $ 2.2