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Earnings (loss) per common share
 9 Months Ended
Sep. 30, 2024
Earnings Per Share [Abstract]  
Earnings (loss) per common share Earnings (loss) per common share
Basic earnings (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 earnings (loss) per common share adjusts basic earnings (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 earnings (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 earnings (loss) per common share because their effect would have been antidilutive.
The following table presents the calculation of basic and diluted earnings (loss) per common share:
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Numerator: 
Net income (loss)$114.8 $(263.4)$(159.3)$(711.0)
Denominator:
Weighted-average number of shares outstanding-basic53.1 51.8 52.6 50.9 
Dilutive securities - equity awards2.5 — — — 
Weighted-average number of shares outstanding-diluted55.6 51.8 52.6 50.9 
Earnings (loss) per common share - basic$2.16 $(5.08)$(3.03)$(13.97)
Earnings (loss) per common share - diluted$2.06 $(5.08)$(3.03)$(13.97)
Anti-dilutive securities2.6 4.0 4.4 3.6