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Loss per common share
 9 Months Ended
Sep. 30, 2023
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. 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 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:
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
(As Restated)(As Restated)
Numerator: 
Net loss$(263.4)$(87.1)$(711.0)$(144.6)
Denominator:
Weighted-average number of shares outstanding-basic51.8 49.9 50.9 50.2 
Weighted-average number of shares outstanding-diluted51.8 49.9 50.9 50.2 
Loss per common share - basic$(5.08)$(1.75)$(13.97)$(2.88)
Loss per common share - diluted$(5.08)$(1.75)$(13.97)$(2.88)
Anti-dilutive securities4.0 3.3 3.6 2.6