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EARNINGS PER SHARE (Tables)
9 Months Ended
Sep. 30, 2013
EARNINGS PER SHARE  
Summary of computation of basic and diluted earnings per share

The table below presents the computation of basic and diluted earnings per share (in millions, except for per share information):

 
  Three Months
Ended
September 30,
  Nine Months
Ended
September 30,
 
 
  2013   2012   2013   2012  

Basic:

                         

Net income

  $ 76.9   $ 69.2   $ 315.9   $ 202.1  
                   

Weighted-average shares outstanding

    111.0     115.7     112.5     114.9  
                   

Basic earnings per share

  $ 0.69   $ 0.60   $ 2.81   $ 1.76  
                   

Diluted:

                         

Net income

  $ 76.9   $ 69.2   $ 315.9   $ 202.1  
                   

Weighted-average shares outstanding

    111.0     115.7     112.5     114.9  

Dilutive effect of stock plans

    1.9     3.3     2.2     3.5  
                   

Dilutive weighted-average shares outstanding

    112.9     119.0     114.7     118.4  
                   

Diluted earnings per share

  $ 0.68   $ 0.58   $ 2.75   $ 1.71