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Plant, Property and Equipment, Net (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Plant, Property and Equipment, Net (Textual) [Abstract]        
Recognized depreciation expense $ 13.4 $ 14.2 $ 26.4 $ 28.0