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Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Tax (benefit) expense on discontinued operations $ (1.3) $ 4.1 $ 7.6 $ 15.8