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EARNINGS (LOSS) PER SHARE (Tables)
12 Months Ended
Dec. 31, 2011
EARNINGS (LOSS) PER SHARE [Abstract]  
Earnings per share

        The computation of basic and diluted earnings (loss) per share is as follows:

Year Ended December 31,   2011     2010     2009  
(In millions except per share amounts)                  
Net income (loss) $ 51.5   $ 54.4   $ (86.3 )
Less: income attributable to noncontrolling interest   0.8     0.6     0.3  
Income (loss) attributable to Jones   50.7     53.8     (86.6 )
Less: income (loss) allocated to participating securities   1.5     2.4     (3.6 )
Income (loss) available to common stockholders of Jones $ 49.2   $ 51.4   $ (83.0 )
Weighted-average common shares outstanding - basic   79.6     82.1     81.7  
Effect of dilutive employee stock options and restricted stock   1.7     0.5     -  
Weighted-average common shares and share equivalents outstanding - diluted   81.3     82.6     81.7  
Earnings (loss) per share                  
  Basic $ 0.62   $ 0.63   $ (1.02 )
  Diluted   0.61     0.62     (1.02 )