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Net Income Per Share
12 Months Ended
Dec. 31, 2011
Net income per share  
Net Income Per Share
Note 6: Net Income Per Share

The following table reconciles net income and shares used in the calculation of basic net income per share to those used for diluted net income per share:

($ and shares in millions)
 
2011
  
2010
  
2009
 
Net income, as reported, for basic net income per share
 $75.5  $65.3  $72.6 
Plus: interest expense on convertible debt, net of tax
  4.3   4.3   4.3 
Net income for diluted net income per share
 $79.8  $69.6  $76.9 
Weighted average common shares outstanding
  33.7   33.3   32.8 
Assumed stock options exercised and awards vested, based on the treasury stock method
  0.4   0.5   0.6 
Assumed conversion of convertible debt, based on the if-converted method
  2.9   2.9   2.9 
Weighted average shares assuming dilution
  37.0   36.7   36.3 

Options outstanding but not included in the computation of diluted net income per share because their impact was antidilutive were 1.6 million, 1.1 million and 1.1 million for fiscal years 2011, 2010 and 2009, respectively.