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Net Income Per Share
 6 Months Ended
Jun. 27, 2021
Earnings Per Share, Basic and Diluted [Abstract]  
Net Income Per Share Net Income Per ShareBasic net income per share was calculated by dividing net income by the weighted average number of outstanding common shares for the period. Diluted net income per share was calculated consistent with basic net income per share including the effect of dilutive unissued common shares related to the Company's stock-based employee compensation program. The effect of stock options and RSUs on net income per share-diluted is determined through the application of the treasury stock method, whereby net proceeds received by the Company based on assumed exercises are hypothetically used to repurchase the Company's common stock at the average market price during the period.
The following table sets forth the computation of net income per share (in millions except per share amounts):
Three Months EndedSix Months Ended
June 27, 2021June 28, 2020June 27, 2021June 28, 2020
Net income$82.9 $33.2 $155.4 $77.9 
Weighted average common shares outstanding134.8 133.8 134.7 133.9 
Effect of dilutive stock awards0.5 0.8 0.6 1.0 
Weighted average common shares outstanding and potential common shares135.3 134.6 135.3 134.9 
Net income per share
Basic$0.61 $0.25 $1.15 $0.58 
Diluted$0.61 $0.25 $1.15 $0.58 

The weighted number of shares outstanding used in the calculation of diluted earnings per share does not include the effect of the following anti-dilutive securities and awards subject to performance conditions which have not been fully satisfied at the end of the respective reporting periods:
Three Months EndedSix Months Ended
June 27, 2021June 28, 2020June 27, 2021June 28, 2020
Anti-dilutive awards0.1 0.4 0.1 0.3 
Awards subject to performance conditions not fully satisfied0.2 — 0.2 — 
Total0.3 0.4 0.3 0.3