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Net (loss) Income per share
 3 Months Ended
Mar. 31, 2022
Earnings Per Share [Abstract]  
Net (loss) Income per share Net (loss) income per share
The following table presents the calculation of basic and diluted net (loss) income per share:
Three Months Ended March 31,
20222021
Numerator: 
Net (loss) income$(3.7)$69.7 
Denominator:
Weighted-average number of shares—basic50.7 53.3 
Dilutive securities—equity awards— 1.2 
Weighted-average number of shares—diluted50.7 54.5 
Net (loss) income per share - basic$(0.07)$1.31 
Net (loss) income per share - diluted$(0.07)$1.28 
Basic net (loss) income per share is computed by dividing net (loss) income by the weighted average number of shares of common stock outstanding during the period. Diluted (loss) income per share is computed using the treasury method by dividing net (loss) 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. No adjustment for the potential dilutive effect of dilutive securities is reported for the three months ended March 31, 2022 as the effect would have been anti-dilutive due to the Company's net loss.
The following table presents the share-based awards that are not considered in the diluted net (loss) income per share calculation generally because the exercise price of the awards was greater than the average per share closing price during the three months ended March 31, 2022 and 2021. In certain instances, awards may be anti-dilutive even if the average market price exceeds the exercise price when the sum of the assumed proceeds exceeds the difference between the market price and the exercise price.
Three Months Ended March 31,
20222021
Anti-dilutive stock awards1.6 0.1