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Stockholders' Equity - Basic and Diluted Shares Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Numerator (basic and diluted):      
Net income (loss) $ (309.5) $ (6.6) $ 88.9
Dividends to participating securities (0.7) (0.9) (0.6)
Less: Undistributed earnings available to participating securities, Basic 0.0 0.0 (0.5)
Less: Undistributed earnings available to participating securities, diluted 0.0 0.0 (0.5)
Undistributed and distributed earnings (loss) available to common stockholders, basic (310.2) (7.5) 87.8
Undistributed and distributed earnings (loss) available to common stockholders, diluted $ (310.2) $ (7.5) $ 87.8
Denominator:      
Average number of common shares outstanding (shares) 54,506,900 42,442,200 31,030,400
Effect of dilutive stock-based compensation (shares) 0 0 369,900
Average number of common and potential common shares outstanding (shares) 54,506,900 42,442,200 31,400,300