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Net income per share
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Net income per share Net income per share
The following table presents the calculation of basic and diluted net income per share:
 
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Numerator: 
Net income$4.6 $92.7 $74.3 $80.2 
Denominator:
Weighted-average number of shares—basic53.6 52.6 53.5 52.3 
Dilutive securities—equity awards0.4 0.9 0.8 0.9 
Weighted-average number of shares—diluted54.0 53.5 54.3 53.2 
Net income per share - basic$0.09 $1.76 $1.40 $1.53 
Net income per share - diluted$0.09 $1.73 $1.37 $1.51 
Basic net income per share is computed by dividing net income by the weighted average number of shares of common stock outstanding during the period. Diluted income per share is computed using the treasury method by dividing net income by the weighted average number of shares of common stock outstanding during the period, adjusted for the potential dilutive effect of other securities if such securities were converted or exercised and are not anti-dilutive.
The following table presents the share-based awards that are not considered in the diluted net income per share calculation because the exercise price of the awards was greater than the average per share closing price during the three and six months ended June 30, 2021 and 2020.
Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Anti-dilutive stock awards1.4 0.4 0.5 0.6