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Net income (loss) per common share
 3 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
Net income (loss) per common share Net income (loss) per common share
Basic earnings or loss per common share is calculated using the treasury method by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the period. Diluted income or loss per common share adjusts basic earnings or loss per common share for the effects of potentially dilutive common shares and is calculated using the treasury stock method. Potentially dilutive common shares include the dilutive effect of shares issuable under our equity compensation plans, including stock options, restricted stock units and performance stock units. Diluted income or loss per share excludes anti-dilutive securities, which represent the number of potential common shares related to shares issuable under our equity compensation plan that were excluded from diluted income or loss per common share because their effect would have been antidilutive.
The following table presents the calculation of basic and diluted income or loss per common share:
Three Months Ended March 31,
20242023
Numerator: 
Net income (loss)$9.0 $(186.2)
Denominator:
Weighted-average number of shares outstanding-basic52.2 50.2 
Weighted-average number of shares outstanding-diluted52.2 50.2 
Income (loss) per common share - basic$0.17 $(3.71)
Income (loss) per common share - diluted$0.17 $(3.71)
Anti-dilutive securities4.5 3.2