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Investment in Joint Ventures Investment in Joint Ventures (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2009
Schedule of Equity Method Investments [Line Items]    
Payments to Acquire Interest in Joint Venture $ 16.5 $ 10.2
Anhui Jianghuai Automobile Group Co, Ltd. [Member]
   
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment, Ownership Percentage 50.00%