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Net Loss Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Numerator (basic and diluted):        
Net loss $ (20.8) $ (455.0) $ (50.2) $ (467.2)
Less: Dividends to participating securities (0.1) (0.5) (0.2) (0.7)
Net loss attributable to Common Stockholders, basic (20.9) (455.5) (50.4) (467.9)
Net loss attributable to Common Stockholders, diluted $ (20.9) $ (455.5) $ (50.4) $ (467.9)
Denominator:        
Average number of common shares outstanding (in shares) 54,327,500 54,659,100 54,305,800 54,600,100
Effect of dilutive stock-based compensation (in shares) 0 0 0 0
Average number of common and potential common shares outstanding (in shares) 54,327,500 54,659,100 54,305,800 54,600,100