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Net Loss Per Share (Tables)
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Schedule of Reconciliation of the Average Number of Common and Potential Common Shares Outstanding Used in the Calculations of Basic and Diluted Net Loss Per Share A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net loss per share follows (in millions, shares in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2023202220232022
Numerator (basic and diluted):  
Net loss
$(455.0)$(22.5)$(467.2)$(9.1)
Less: Dividends to participating securities(0.5)(0.2)(0.7)(0.7)
Net loss attributable to Common Stockholders
$(455.5)$(22.7)$(467.9)$(9.8)
Denominator:  
Average number of common shares outstanding54,659.1 52,593.9 54,600.1 38,415.9 
Effect of dilutive stock-based compensation(1)
— — — — 
Average number of common and potential common shares outstanding54,659.1 52,593.9 54,600.1 38,415.9 
(1) Diluted loss per share excludes the weighted average potential common shares for the three and nine months ended September 30, 2023 and 2022 as their inclusion would be anti-dilutive.