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Stockholders' Equity - Basic and Diluted Shares Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator (basic and diluted):      
Net income (loss) $ (6.6) $ 88.9 $ 83.8
Dividends (0.9) (0.6) (0.7)
Less: Undistributed earnings available to participating securities, Basic 0.0 (0.5) (0.4)
Less: Undistributed earnings available to participating securities, Diluted 0.0 (0.5) (0.4)
Undistributed and distributed earnings (loss) available to common stockholders, diluted (7.5) 87.8 82.7
Undistributed and distributed earnings (loss) available to common stockholders, basic $ (7.5) $ 87.8 $ 82.7
Denominator:      
Average number of common shares outstanding (shares) 42,442,200 31,030,400 30,832,700
Effect of dilutive stock-based compensation (shares) 0 369,900 271,500
Average number of common and potential common shares outstanding (shares) 42,442,200 31,400,300 31,104,200