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Net Income (Loss) Per Share (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
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)
Distributed earnings (loss) available to participating securities, basic (4.6) 11.5 (12.4) 12.9
Distributed earnings (loss) available to participating securities, diluted $ (4.6) $ 11.5 $ (12.4) $ 12.9
Denominator:        
Average number of common shares outstanding (in shares) 54,656,400 31,260,100 54,570,100 31,209,300
Effect of dilutive stock-based compensation (in shares) 0 149,700 0 202,700
Average number of common and potential common shares outstanding (in shares) 54,656,400 31,409,800 54,570,100 31,412,000