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WEIGHTED AVERAGE SHARES OUTSTANDING
6 Months Ended
Jun. 30, 2018
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WEIGHTED AVERAGE SHARES OUTSTANDING

NOTE 6. WEIGHTED AVERAGE SHARES OUTSTANDING

Below is a reconciliation of basic to diluted shares outstanding:

Three Months EndedSix Months Ended
June 30,June 30,
2018201720182017
Basic191.9191.0191.6191.1
Dilutive effect of shares issuable under stock-based compensation plans2.52.82.93.0
Diluted194.4193.8194.5194.1
Anti-dilutive options to purchase common shares and restricted stock as well as contingently issuable restricted stock which are excluded from the table above0.50.70.71.0

The calculation of diluted EPS requires certain assumptions regarding the use of both cash proceeds and assumed proceeds that would be received upon the exercise of stock options and vesting of restricted stock outstanding as of June 30, 2018 and 2017.