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Net Income (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2023
Earnings Per Share [Abstract]  
Schedule of Reconciliation of the Common and Potential Common Shares Outstanding Used in Earnings Per Share Calculation A reconciliation of the average number of common and potential common shares outstanding used in the calculations of basic and diluted net income (loss) per share follows (in millions, shares in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2023202220232022
Numerator (basic and diluted):  
Net income (loss)$(4.5)$11.8 $(12.2)$13.4 
Less: Dividends to participating securities(0.1)(0.3)(0.2)(0.5)
Net income (loss) attributable to Common Stockholders$(4.6)$11.5 $(12.4)$12.9 
Denominator:  
Average number of common shares outstanding54,656.4 31,260.1 54,570.1 31,209.3 
Effect of dilutive stock-based compensation(1)
— 149.7 — 202.7 
Average number of common and potential common shares outstanding54,656.4 31,409.8 54,570.1 31,412.0 
(1) Diluted loss per share excludes the weighted average potential common shares for the three and six months ended June 30, 2023 as their inclusion would be anti-dilutive.