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Net income (loss) per common share
 12 Months Ended
Dec. 31, 2023
Earnings Per Share [Abstract]  
Net income (loss) per common share Net income (loss) per common share
Basic net income (loss) per common share is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share adjusts basic 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 net income (loss) per share excludes anti-dilutive securities, which represent the number of potential common shares related to shares issuable under our equity compensation plans that were excluded from diluted net income (loss) per common share because their effect would have been antidilutive. No adjustment for the potential dilutive effect of dilutive securities is reported for the years ended December 31, 2023 and 2022 as the effect would have been anti-dilutive due to the Company's net loss.
The following table presents the calculation of basic and diluted net income (loss) per common share:
Year Ended December 31,
202320222021
Numerator:   
Net income (loss)$(760.5)$(211.6)$219.5 
Denominator:
Weighted-average number of shares-basic51.2 50.1 53.5 
Dilutive effect of employee incentive plans— — 0.6 
Weighted-average number of shares-diluted51.2 50.1 54.1 
Net income (loss) per common share - basic$(14.85)$(4.22)$4.10 
Net income (loss) per common share - diluted$(14.85)$(4.22)$4.06 
The following table presents the share-based awards that are not considered in the diluted net income (loss) per common share calculation generally because the exercise price of the awards was greater than the average per share closing price during the year ending December 31, 2023, 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.
Year Ended December 31,
202320222021
Anti-dilutive stock awards3.6 2.8 1.0