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Statements of Operations and Comprehensive Income (Loss) (Parenthetical) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements of Operations and Comprehensive Loss [Abstract]      
Tax on sale of net assets $ 0 $ 0 $ 6.5