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Loss per common share
 12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Loss per common share Loss per common share
Basic loss per common share is calculated using the treasury method by dividing net loss by the weighted average number of shares of common stock outstanding during the period. Diluted 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, as well as shares issuable upon exercises of the Warrants. Diluted loss per share excludes anti-dilutive securities, which represent the number of potential common shares related to shares issuable under our equity compensation plan and pursuant to exercises of the Warrants that were excluded from diluted loss per common share because their effect would have been antidilutive.
The following table presents the calculation of basic and diluted loss per common share:
Year Ended December 31,
202420232022
Numerator:   
Net loss$(190.6)$(760.5)$(211.6)
Denominator:
Weighted-average number of shares-basic53.0 51.2 50.1 
Dilutive securities - equity awards— — — 
Weighted-average number of shares-diluted53.0 51.2 50.1 
Net loss per common share - basic$(3.60)$(14.85)$(4.22)
Net loss per common share - diluted$(3.60)$(14.85)$(4.22)
The following table presents the securities and equity awards that are not considered in the diluted 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, 2024, 2023 and 2022 or the period resulted in a net loss, thus making the awards anti-dilutive. 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,
202420232022
Anti-dilutive stock awards4.9 3.6 2.8